US4751035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic containers with folded-over internal layers and methods for making same
Assignee: Pechiney Plastic Packaging Inc
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Filing: 1985-06-10
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Granted: 1988-06-14
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Expires: 2005-06-10
Abstract
Abstract Methods of injecting into a cavity an at least three-layer flow stream having a fast flow stream line, are provided which include establishing the flow of material of first and second layers of the flow stream to form an interface therebetween at a first location not coincident with the fast flow stream line, interposing the flow of material of a third layer in the interface, and moving the third layer to a second location relatively more proximate to, substantially coincident with, or across from and not substantially coincident with the fast flow stream line. This moving achieves foldover of the third layer and can be effected by selectively changing the flow of material(s) on one side of the third layer relative to the flow of material(s) on the other side thereof, at or shortly after the interposition of the third layer. Preferably, the interface is annular and the interposition is at substantially all places around the interface. These methods can be used to prevent, reduce or overcome bias of the terminal or marginal end portion of the third layer during multi-layer injection of a container, to provide a substantially unbiased overall leading edge of the third layer, such that the folded over portion and the unfolded portion of the marginal end portion is finally positioned in the sidewall of the container in a substantially unbiased plane relative to the axis of the container.
Inventors
- 👤 Robert J. McHenry
- 👤 Henry Pfutzenreuter, III
- 👤 Thomas T. Tung
- 👤 John Vella, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:25
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/16; B29C49/00; B29C49/071; B29C45/1642; B29C45/1643; B29C45/17; B29C45/20; B29C48/00; B29C48/16; B29C48/18; B29C48/185; B29C49/0005; B65; B65D; B65D1/00; B65D1/22; B65D1/26; B65D1/28; B29C45/1603; B29C2045/161; B29C2045/1612; B29C2949/00; B29C2949/07; B29C2949/072; B29C2949/0724; B29C2949/0725; B29C2949/073; B29C2949/0731; B29C2949/0733; B29C2949/076; B29C2949/0761; B29C2949/0762; B29C2949/0768; B29C2949/077; B29C2949/0772; B29C2949/0776; B29C2949/078; B29C2949/0781; B29C2949/081; B29C2949/0811; B29C2949/0819; B29C2949/30; B29C2949/3008; B29C2949/3012; B29C2949/3016; B29C2949/302; B29C2949/3024; B29C2949/3026; B29C2949/3028; B29C2949/3032; B29C48/03; B29C49/42; B29C49/64; B29C49/6604; B29C49/6605; B29K; B29K2995/00; B29K2995/0037; B29K2995/0068; B29K2995/0069; B29L; B29L2031/00; B29L2031/712; B29L2031/7158; B29L2031/716
Claims Analysis
Total Claims: 71
Claim 1
Independent Claim
220 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to the first layer to form an interface between the flowing materials of said first and second layers, positioning the interface between the flowing materials of said first and second layers at a first location which is not coincident with said fast flow streamline, interposing the flow of material of a third layer of the flow stream between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and moving the location of said third layer to a second location which is substantially coincident with said fast flow streamline thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 2
Independent Claim
220 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to the first layer to form an interface between the flowing materials of said first and second layers, positioning the interface between the flowing materials of said first and second layers at a first location which is not coincident with said fast flow streamline, interposing the flow of material of a third layer of the flow stream between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and moving the location of said third layer to a second location which is substantially coincident with said fast flow streamline thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 3
Independent Claim
221 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to the first layer to form an interface between the flowing materials of said first and second layers, positioning the interface between the flowing materials of said first and second layers at a first location which is not coincident with said fast flow streamline, interposing the flow of material of a third layer of the flow stream between said first and second layers said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and moving the location of said third layer to a second location which is relatively more proximate to said fast flow streamline thereby causing the third layer to fold over to form an aritcle in the cavity having a folded over internal layer.
Claim 4
Independent Claim
221 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to the first layer to form an interface between the flowing materials of said first and second layers, positioning the interface between the flowing materials of said first and second layers at a first location which is not coincident with said fast flow streamline, interposing the flow of material of a third layer of the flow stream between said first and second layers said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and moving the location of said third layer to a second location which is relatively more proximate to said fast flow streamline thereby causing the third layer to fold over to form an aritcle in the cavity having a folded over internal layer.
Claim 5
Independent Claim
238 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to the first layer to form an interface between the flowing materials of said first and second layers, positioning the interface between the flowing materials of said first and second layers at a first location which is not coincident with said fast flow streamline, interposing the flow of material of a third layer of the flow stream between said first and second layers, said third layer to internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and, when or shortly after the flow of said third layer material has been interposed between said first and second layers, moving the location of said third layer to a second location which is substantially coincident with said fast flow streamline, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 6
Independent Claim
238 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to the first layer to form an interface between the flowing materials of said first and second layers, positioning the interface between the flowing materials of said first and second layers at a first location which is not coincident with said fast flow streamline, interposing the flow of material of a third layer of the flow stream between said first and second layers, said third layer to internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and, when or shortly after the flow of said third layer material has been interposed between said first and second layers, moving the location of said third layer to a second location which is substantially coincident with said fast flow streamline, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 7
Independent Claim
241 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to the first layer to form an interface between the flowing materials of said first and second layers, positioning the interface between the flowing materials of said first and second layers at a first location which is not coincident with said fast flow streamline, interposing the flow of material of a third layer of the flow stream between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and, when or shortly after the flow of said third layer material has been interposed between said first and second layers, moving the location of said third layer to a second location which is relatively more proximate to said fast flow streamline, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 8
Independent Claim
241 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to the first layer to form an interface between the flowing materials of said first and second layers, positioning the interface between the flowing materials of said first and second layers at a first location which is not coincident with said fast flow streamline, interposing the flow of material of a third layer of the flow stream between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and, when or shortly after the flow of said third layer material has been interposed between said first and second layers, moving the location of said third layer to a second location which is relatively more proximate to said fast flow streamline, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 9
Dependent Claim
49 words
The method of claim 3 wherein the location of the third layer is moved to said second location when or shortly after the flow of said third layer material has been interposed between said first and second layers at substantially all places across the breadth of the layered stream.
Claim 10
Independent Claim
225 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to the first layer to form an interface between the flowing materials of said first and second layers, positioning the interface between the flowing materials of said first and second layers at a first location which is not coincident with said fast flow streamline, interposing the flow of material of a third layer of the flow stream between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and moving the location of said third layer across the fast flow streamline to a second location which is not coincident with said fast flow streamline, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 11
Independent Claim
225 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to the first layer to form an interface between the flowing materials of said first and second layers, positioning the interface between the flowing materials of said first and second layers at a first location which is not coincident with said fast flow streamline, interposing the flow of material of a third layer of the flow stream between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and moving the location of said third layer across the fast flow streamline to a second location which is not coincident with said fast flow streamline, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 12
Independent Claim
245 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to the first layer to form an interface between the flowing materials of said first and second layers, positioning the interface between the flowing materials of said first and second layers at a first location which is not coincident with said fast flow streamline, interposing the flow of material of a third layer of the flow stream between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and, when or shortly after the flow of said third layer material has been interposed between said first and second layers, moving the location of said third layer across the fast flow streamline to a second location which is not coincident with said fast flow streamline, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 13
Independent Claim
245 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to the first layer to form an interface between the flowing materials of said first and second layers, positioning the interface between the flowing materials of said first and second layers at a first location which is not coincident with said fast flow streamline, interposing the flow of material of a third layer of the flow stream between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and, when or shortly after the flow of said third layer material has been interposed between said first and second layers, moving the location of said third layer across the fast flow streamline to a second location which is not coincident with said fast flow streamline, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 14
Dependent Claim
49 words
The method of claim 7 wherein the loation of the third layer is moved to said second location when or shortly after the flow of said third layer material has been interposed between said first and second layers at substantially all places across the breadth of the layered stream.
Claim 15
Independent Claim
247 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an aritcle in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to the first layer to form an interface between the flowing materials of said first and second layers, selecting the rate of flow of the first layer material and the rate of flow of the second layer material to position said interface at a first location which is not coincident with the fast flow streamline, interposing the flow of material of a third layer of the flow stream in the interface between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and adjusting the relative rates of flow of said first and second layer materials to move the location of said third layer to a second location which is substantially coincident with said fast flow streamline, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 16
Independent Claim
247 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an aritcle in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to the first layer to form an interface between the flowing materials of said first and second layers, selecting the rate of flow of the first layer material and the rate of flow of the second layer material to position said interface at a first location which is not coincident with the fast flow streamline, interposing the flow of material of a third layer of the flow stream in the interface between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and adjusting the relative rates of flow of said first and second layer materials to move the location of said third layer to a second location which is substantially coincident with said fast flow streamline, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 17
Independent Claim
267 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to the first layer to form an interface between the flowing materials of said first and second layers, selecting the rate of flow of the first layer material and the rate of flow of the second layer material to position said interface at a first location which is not coincident with the fast flow streamline, interposing the flow of material of a third layer of the flow stream in the interface between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and, when or shortly after the flow of said third layer material has been interposed between said first and second layers, adjusting the relative rates of flow of said first and second layer materials to move the location of said third layer to a second location which is substantially coincident with said fast flow streamline, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 18
Independent Claim
267 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to the first layer to form an interface between the flowing materials of said first and second layers, selecting the rate of flow of the first layer material and the rate of flow of the second layer material to position said interface at a first location which is not coincident with the fast flow streamline, interposing the flow of material of a third layer of the flow stream in the interface between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and, when or shortly after the flow of said third layer material has been interposed between said first and second layers, adjusting the relative rates of flow of said first and second layer materials to move the location of said third layer to a second location which is substantially coincident with said fast flow streamline, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 19
Dependent Claim
49 words
The method of claim 10 wherein the location of the third layer is moved to said second location when or shortly after the flow of said third layer material has been interposed between said first and second layers at substantially all places across the breadth of the layered stream.
Claim 20
Independent Claim
207 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer material and the rate of flow of the second layer material to position said interface at a first location which is not coincident with the fast flow streamline, interposing the flow of material of a third layer of the flow stream in the interface between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and adjusting the relative rates of flow of said first and second layer materials to move the location of said third layer across the fast flow streamline to a second location which is not coincident with said fast flow streamline, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 21
Independent Claim
207 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer material and the rate of flow of the second layer material to position said interface at a first location which is not coincident with the fast flow streamline, interposing the flow of material of a third layer of the flow stream in the interface between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and adjusting the relative rates of flow of said first and second layer materials to move the location of said third layer across the fast flow streamline to a second location which is not coincident with said fast flow streamline, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 22
Independent Claim
272 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the stream is highest on a fast flow streamline postioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to the first layer to form an interface between the flowing materials of said first and second layers, selecting the rate of flow of the first layer material and the rate of flow of the second layer material to position said interface at a first location which is not coincident with the fast flow streamline, interposing the flow of material of a third layer of the flow stream in the interface between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and, when or shortly after the flow of said third layer material has been interposed between said first and second layers, adjusting the relative rates of flow of said first and second layer materials to move the location of said third layer across the fast flow streamline to a second location which is not coincident with said fast flow streamline, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 23
Independent Claim
272 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the stream is highest on a fast flow streamline postioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to the first layer to form an interface between the flowing materials of said first and second layers, selecting the rate of flow of the first layer material and the rate of flow of the second layer material to position said interface at a first location which is not coincident with the fast flow streamline, interposing the flow of material of a third layer of the flow stream in the interface between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and, when or shortly after the flow of said third layer material has been interposed between said first and second layers, adjusting the relative rates of flow of said first and second layer materials to move the location of said third layer across the fast flow streamline to a second location which is not coincident with said fast flow streamline, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 24
Dependent Claim
49 words
The method of claim 13 wherein the location of the third layer is moved to said second location when or shortly after the flow of said third layer material has been interposed between said first and second layers at substantially all places across the breadth of the layered stream.
Claim 25
Independent Claim
286 words
A method of injecting, by means of a nozzle having a central injection channel, a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an aritcle in the cavity having a folded over internal layer, comprising during the injection cycle, establishing in said channel the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream to form an interface between the flowing materials of said first and second layers, the flow stream in said channel having a flow streamline which corresponds to the fast flow streamline in the injection cavity, positioning said interface at a first location in said channel which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, interposing the flow of material of a third layer of the flow stream between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, and, moving the location of said third layer in said channel to a second location in said channel which is substantially coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 26
Independent Claim
286 words
A method of injecting, by means of a nozzle having a central injection channel, a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an aritcle in the cavity having a folded over internal layer, comprising during the injection cycle, establishing in said channel the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream to form an interface between the flowing materials of said first and second layers, the flow stream in said channel having a flow streamline which corresponds to the fast flow streamline in the injection cavity, positioning said interface at a first location in said channel which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, interposing the flow of material of a third layer of the flow stream between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, and, moving the location of said third layer in said channel to a second location in said channel which is substantially coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 27
Independent Claim
306 words
A method of injecting, by means of a nozzle having a central injection channel, a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing in said channel the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream to form an interface between the flowing materials of said first and second layers, the flow stream in said channel having a flow streamline which corresponds to the fast flow streamline in the injection cavity, positioning said interface at a first location in said channel which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, interposing the flow of material of a third layer of the flow stream between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, and, when or shortly after the flow of said third layer material has been interposed between said first and second layers, moving the location of said third layer in said channel to a second location in said channel which is substantially coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 28
Independent Claim
306 words
A method of injecting, by means of a nozzle having a central injection channel, a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing in said channel the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream to form an interface between the flowing materials of said first and second layers, the flow stream in said channel having a flow streamline which corresponds to the fast flow streamline in the injection cavity, positioning said interface at a first location in said channel which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, interposing the flow of material of a third layer of the flow stream between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, and, when or shortly after the flow of said third layer material has been interposed between said first and second layers, moving the location of said third layer in said channel to a second location in said channel which is substantially coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 29
Dependent Claim
49 words
The method of claim 16 wherein the location of the third layer is moved to said second location when or shortly after the flow of said third layer material has been interposed between said first and second layers at substantially all places across the breadth of the layered stream.
Claim 30
Independent Claim
304 words
A method of injecting, by means of a nozzle having a central injection channel, a multi-layer flow stream comprised of three layers into an injection cavity in which the speed of flow of the stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing in said channel the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream to form an interface between the flowing materials of said first and second layers, the flow stream in said channel having a flow streamline which corresponds to the fast flow streamline in the injection cavity, positioning said interface at a first location in said channel which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, interposing the flow of material of a third layer of the flow stream between said first and second layers, said third layer to become the internal layer of article, the location of the third layer being at a position which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, and, moving the location of said third layer in said channel across the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity to a second location in said channel which is not coincident with said flow streamline in the channel that corresponds to the fast flow streamline in the injection cavity, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 31
Independent Claim
304 words
A method of injecting, by means of a nozzle having a central injection channel, a multi-layer flow stream comprised of three layers into an injection cavity in which the speed of flow of the stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing in said channel the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream to form an interface between the flowing materials of said first and second layers, the flow stream in said channel having a flow streamline which corresponds to the fast flow streamline in the injection cavity, positioning said interface at a first location in said channel which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, interposing the flow of material of a third layer of the flow stream between said first and second layers, said third layer to become the internal layer of article, the location of the third layer being at a position which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, and, moving the location of said third layer in said channel across the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity to a second location in said channel which is not coincident with said flow streamline in the channel that corresponds to the fast flow streamline in the injection cavity, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 32
Independent Claim
324 words
A method of injecting, by means of a nozzle having an injection channel, a multi-layer flow stream comprised of three layers into an injection cavity in which the speed of flow of the stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing in said channel the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream to form an interface between the flowing materials of said first and second layers, the flow stream in said channel having a flow streamline which corresponds to the fast flow streamline in the injection cavity, positioning said interface at a first location in said channel which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, interposing the flow of material of a third layer of the flow stream between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, and, when or shortly after the flow of said third layer material has been interposed between said first and second layers, moving the location of said third layer in said channel across the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity to a second location in said channel which is not coincident with said flow streamline in the channel that corresponds to the fast flow streamline in the injection cavity, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 33
Independent Claim
324 words
A method of injecting, by means of a nozzle having an injection channel, a multi-layer flow stream comprised of three layers into an injection cavity in which the speed of flow of the stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing in said channel the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream to form an interface between the flowing materials of said first and second layers, the flow stream in said channel having a flow streamline which corresponds to the fast flow streamline in the injection cavity, positioning said interface at a first location in said channel which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, interposing the flow of material of a third layer of the flow stream between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, and, when or shortly after the flow of said third layer material has been interposed between said first and second layers, moving the location of said third layer in said channel across the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity to a second location in said channel which is not coincident with said flow streamline in the channel that corresponds to the fast flow streamline in the injection cavity, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 34
Dependent Claim
49 words
The method of claim 19 wherein the location of the third layer is moved to said second location when or shortly after the flow of said third layer material has been interposed between said first and second layers at substantially all places across the breadth of the layered stream.
Claim 35
Independent Claim
229 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on an annular fast flow streamline positioned intermediate the boundaries of said layered stream, to form an aritcle in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to and around the first layer to form an annular interface between the flowing materials of said first and second layers, positioning the interface between the flowing materials of said first and second layers at a first location which is not coincident with said fast flow streamline, interposing the flow of material of a third layer of the flow stream around said first layer and between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and moving the location of said third layer to a second location which is substantially coincident with said fast flow streamline, thereby causing the thrd layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 36
Independent Claim
229 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on an annular fast flow streamline positioned intermediate the boundaries of said layered stream, to form an aritcle in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to and around the first layer to form an annular interface between the flowing materials of said first and second layers, positioning the interface between the flowing materials of said first and second layers at a first location which is not coincident with said fast flow streamline, interposing the flow of material of a third layer of the flow stream around said first layer and between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and moving the location of said third layer to a second location which is substantially coincident with said fast flow streamline, thereby causing the thrd layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 37
Independent Claim
230 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on an annular fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to and around the first layer to form an annular interface between the flowing materials of said first and second layers, positioning the interface between the flowing materials of said first and second layers at a first location which is not coincident with said fast flow streamline, interposing the flow of material of a third layer of the flow stream around said first layer and between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and moving the location of said third layer to a second location which is relatively more proximate to said fast flow streamline, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 38
Independent Claim
230 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on an annular fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to and around the first layer to form an annular interface between the flowing materials of said first and second layers, positioning the interface between the flowing materials of said first and second layers at a first location which is not coincident with said fast flow streamline, interposing the flow of material of a third layer of the flow stream around said first layer and between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and moving the location of said third layer to a second location which is relatively more proximate to said fast flow streamline, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 39
Independent Claim
249 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on an annular fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to and around the first layer to form an annular interface between the flowing materials of said first and second layers, positioning the interface between the flowing materials of said first and second layers at a first location which is not coincident with said fast flow streamline, interposing the flow of material of a third layer of the flow stream around said first layer and between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and, when or shortly after the flow of said third layer material has been interposed between said first and second layers, moving the location of said third layer to a second location which is substantially coincident with said fast flow streamline, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 40
Independent Claim
249 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on an annular fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to and around the first layer to form an annular interface between the flowing materials of said first and second layers, positioning the interface between the flowing materials of said first and second layers at a first location which is not coincident with said fast flow streamline, interposing the flow of material of a third layer of the flow stream around said first layer and between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and, when or shortly after the flow of said third layer material has been interposed between said first and second layers, moving the location of said third layer to a second location which is substantially coincident with said fast flow streamline, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 41
Dependent Claim
54 words
The method of claim 23 wherein the location of the third layer is moved to said second location when or shortly after the flow of said third layer material has been interposed between said first and second layers at substantially all places around the circumference of the annulus between the first and second layers.
Claim 42
Independent Claim
233 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to and around the first layer to form an annular interface between the flowing materials of said first and second layers, positioning the interface between the flowing materials of said first and second layers at a first location which is not coincident with said fast flow streamline, interposing the flow of material of a third layer of the flow stream around said first layer and between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and, moving the location of said third layer across the fast flow streamline to a second location which is not coincident with said fast flow streamline, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 43
Independent Claim
233 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to and around the first layer to form an annular interface between the flowing materials of said first and second layers, positioning the interface between the flowing materials of said first and second layers at a first location which is not coincident with said fast flow streamline, interposing the flow of material of a third layer of the flow stream around said first layer and between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and, moving the location of said third layer across the fast flow streamline to a second location which is not coincident with said fast flow streamline, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 44
Independent Claim
253 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to and around the first layer to form an annular interface between the flowing materials of said first and second layers, positioning the interface between the flowing materials of said first and second layers at a first location which is not coincident with said fast flow streamline, interposing the flow of material of a third layer of the flow stream around said first layer and between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and, when or shortly after the flow of said third layer material has been interposed between said first and second layers, moving the location of said third layer across the fast flow streamline to a second location which is not coincident with said fast flow streamline, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 45
Independent Claim
253 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to and around the first layer to form an annular interface between the flowing materials of said first and second layers, positioning the interface between the flowing materials of said first and second layers at a first location which is not coincident with said fast flow streamline, interposing the flow of material of a third layer of the flow stream around said first layer and between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and, when or shortly after the flow of said third layer material has been interposed between said first and second layers, moving the location of said third layer across the fast flow streamline to a second location which is not coincident with said fast flow streamline, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 46
Dependent Claim
54 words
The method of claim 26 wherein the location of the third layer is moved to said second location when or shortly after the flow of said third layer material has been interposed between said first and second layers at substantially all places around the circumference of the annulus between the first and second layers.
Claim 47
Independent Claim
299 words
A method of injecting, by means of a nozzle having an injection channel, a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle establishing in said channel the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to and around the first layer to form an annular interface between the flowing materials of said first and second layers, the flow stream in said channel having a flow streamline which corresponds to the fast flow streamline in the injection cavity, positioning said interface at a first location in said channel which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, interposing the flow of material of a third layer of the flow stream around said first layer and between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, and moving the location of said third layer in said channel to a second location in said channel which is substantially coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 48
Independent Claim
299 words
A method of injecting, by means of a nozzle having an injection channel, a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle establishing in said channel the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to and around the first layer to form an annular interface between the flowing materials of said first and second layers, the flow stream in said channel having a flow streamline which corresponds to the fast flow streamline in the injection cavity, positioning said interface at a first location in said channel which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, interposing the flow of material of a third layer of the flow stream around said first layer and between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, and moving the location of said third layer in said channel to a second location in said channel which is substantially coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 49
Independent Claim
319 words
A method of injecting, by means of a nozzle having an injection channel, a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle establishing in said channel the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to and around the first layer to form an annular interface between the flowing materials of said first and second layers, the flow stream in said channel having a flow streamline which corresponds to the fast flow streamline in the injection cavity, positioning said interface at a first location in said channel which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, interposing the flow of material of a third layer of the flow stream around said first layer and between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, and, when or shortly after the flow of said third layer material has been interposed between said first and second layers, moving the location of said third layer in said channel to a second location in said channel which is substantially coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 50
Independent Claim
319 words
A method of injecting, by means of a nozzle having an injection channel, a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle establishing in said channel the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to and around the first layer to form an annular interface between the flowing materials of said first and second layers, the flow stream in said channel having a flow streamline which corresponds to the fast flow streamline in the injection cavity, positioning said interface at a first location in said channel which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, interposing the flow of material of a third layer of the flow stream around said first layer and between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, and, when or shortly after the flow of said third layer material has been interposed between said first and second layers, moving the location of said third layer in said channel to a second location in said channel which is substantially coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 51
Dependent Claim
54 words
The method of claim 29 wherein the location of the third layer is moved to said second location when or shortly after the flow of said third layer material has been interposed between said first and second layers at substantially all places around the circumference of the annulus between the first and second layers.
Claim 52
Independent Claim
317 words
A method of injecting, by means of a nozzle having an injection channel, a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing in said channel the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to and around the first layer to form an annular interface between the flowing materials of said first and second layers, the flow stream in said channel having a flow streamline which corresponds to the fast flow streamline in the injection cavity, positioning said interface at a first location in said channel which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, interposing the flow of material of a third layer of the flow stream around said first layer and between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, and moving the location of said third layer in said channel across the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity to a second location in said channel which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 53
Independent Claim
317 words
A method of injecting, by means of a nozzle having an injection channel, a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing in said channel the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to and around the first layer to form an annular interface between the flowing materials of said first and second layers, the flow stream in said channel having a flow streamline which corresponds to the fast flow streamline in the injection cavity, positioning said interface at a first location in said channel which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, interposing the flow of material of a third layer of the flow stream around said first layer and between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, and moving the location of said third layer in said channel across the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity to a second location in said channel which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 54
Independent Claim
337 words
A method of injecting, by means of a nozzle having an injection channel, a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle establishing in said channel the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to and around the first layer to form an annular interface between the flowing materials of said first and second layers, the flow stream in said channel having a flow streamline which corresponds to the fast flow streamline in the injection cavity, positioning said interface at a first location in said channel which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, interposing the flow of material of a third layer of the flow stream around said first layer and between said first and second layers, said third layer to become the internal layer of the article, the location, of the third layer being at a position which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, and, when or shortly after the flow of said third layer material has been interposed between said first and second layers, moving the location of said third layer in said channel across the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity to a second location in said channel which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 55
Independent Claim
337 words
A method of injecting, by means of a nozzle having an injection channel, a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle establishing in said channel the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to and around the first layer to form an annular interface between the flowing materials of said first and second layers, the flow stream in said channel having a flow streamline which corresponds to the fast flow streamline in the injection cavity, positioning said interface at a first location in said channel which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, interposing the flow of material of a third layer of the flow stream around said first layer and between said first and second layers, said third layer to become the internal layer of the article, the location, of the third layer being at a position which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, and, when or shortly after the flow of said third layer material has been interposed between said first and second layers, moving the location of said third layer in said channel across the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity to a second location in said channel which is not coincident with the flow streamline in said channel that corresponds to the fast flow streamline in the injection cavity, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 56
Dependent Claim
54 words
The method of claim 32 wherein the location of the third layer is moved to said second location when or shortly after the flow of said third layer material has been interposed between said first and second layers at substantially all places around the circumference of the annulus between the first and second layers.
Claim 57
Independent Claim
253 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to and around the first layer to form an annular interface between the flowing materials of said first and second layers, selecting the rate of flow of the first layer material and the rate of flow of the second layer material to position said interface at a first location which is not coincident with said fast flow streamline, interposing the flow of material of a third layer of the flow stream around said first layer and between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and adjusting the relative rates of flow of said first and second layer materials to move the location of said third layer to a second location which is substantially coincident with said fast flow streamline, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 58
Independent Claim
253 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to and around the first layer to form an annular interface between the flowing materials of said first and second layers, selecting the rate of flow of the first layer material and the rate of flow of the second layer material to position said interface at a first location which is not coincident with said fast flow streamline, interposing the flow of material of a third layer of the flow stream around said first layer and between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and adjusting the relative rates of flow of said first and second layer materials to move the location of said third layer to a second location which is substantially coincident with said fast flow streamline, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 59
Independent Claim
273 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to and around the first layer to form an annular interface between the flowing materials of said first and second layers, selecting the rate of flow of the first layer material and the rate of flow of the second layer material to position said interface at a first location which is not coincident with said fast flow streamline, interposing the flow of material of a third layer of the flow stream around said first layer and between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and, when or shortly after the flow of said third layer material has been interposed between said first and second layers, adjusting the relative rates of flow of said first and second layer materials to move the location of said third layer to a second location which is substantially coincident with said fast flow streamline, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 60
Independent Claim
273 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to and around the first layer to form an annular interface between the flowing materials of said first and second layers, selecting the rate of flow of the first layer material and the rate of flow of the second layer material to position said interface at a first location which is not coincident with said fast flow streamline, interposing the flow of material of a third layer of the flow stream around said first layer and between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and, when or shortly after the flow of said third layer material has been interposed between said first and second layers, adjusting the relative rates of flow of said first and second layer materials to move the location of said third layer to a second location which is substantially coincident with said fast flow streamline, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 61
Dependent Claim
54 words
The method of claim 35 wherein the location of the third layer is moved to said second location when or shortly after the flow of said third layer material has been interposed between said first and second layers at substantially all places around the circumference of the annulus between the first and second layers.
Claim 62
Independent Claim
258 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to and around the first layer to form an annular interface between the flowing materials of said first and second layers, selecting the rate of flow of the first layer material and the rate of flow of the second layer material to position said interface at a first location which is not coincident with said fast flow streamline, interposing the flow of material of a third layer of the flow stream around said first layer and between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and adjusting the relative rates of flow of said first and second layer materials to move the location of said third layer across the fast flow streamline to a second location which is not coincident with said fast flow streamline, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 63
Independent Claim
258 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to and around the first layer to form an annular interface between the flowing materials of said first and second layers, selecting the rate of flow of the first layer material and the rate of flow of the second layer material to position said interface at a first location which is not coincident with said fast flow streamline, interposing the flow of material of a third layer of the flow stream around said first layer and between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and adjusting the relative rates of flow of said first and second layer materials to move the location of said third layer across the fast flow streamline to a second location which is not coincident with said fast flow streamline, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 64
Independent Claim
278 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to and around the first layer to form an annular interface between the flowing materials of said first and second layers, selecting the rate of flow of the first layer material and the rate of flow of the second layer material to position said interface at a first location which is not coincident with said fast flow streamline, interposing the flow of material of a third layer of the flow stream around said first layer and between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and, when or shortly after the flow of said third layer material has been interposed between said first and second layers, adjusting the relative rates of flow of said first and second layer materials to move the location of said third layer across the fast flow streamline to a second location which is not coincident with said fast flow streamline, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 65
Independent Claim
278 words
A method of injecting a multi-layer flow stream comprising three layers into an injection cavity in which the speed of flow of the layered stream is highest on a fast flow streamline positioned intermediate the boundaries of said layered stream, to form an article in the cavity having a folded over internal layer, comprising during the injection cycle, establishing the flow of material of a first layer of the flow stream and the flow of material of a second layer of the flow stream adjacent to and around the first layer to form an annular interface between the flowing materials of said first and second layers, selecting the rate of flow of the first layer material and the rate of flow of the second layer material to position said interface at a first location which is not coincident with said fast flow streamline, interposing the flow of material of a third layer of the flow stream around said first layer and between said first and second layers, said third layer to become the internal layer of the article, the location of the third layer being at a position which is not coincident with said fast flow streamline, and, when or shortly after the flow of said third layer material has been interposed between said first and second layers, adjusting the relative rates of flow of said first and second layer materials to move the location of said third layer across the fast flow streamline to a second location which is not coincident with said fast flow streamline, thereby causing the third layer to fold over to form an article in the cavity having a folded over internal layer.
Claim 66
Dependent Claim
54 words
The method of claim 38 wherein the location of the third layer is moved to said second location when or shortly after the flow of said third layer material has been interposed between said first and second layers at substantially all places around the circumference of the annulus between the first and second layers.
Claim 67
Independent Claim
158 words
A method of injecting a multi-layer polymer stream into an injection cavity having a fast flow streamline at or near the center line of flow in the injection cavity to form a multi-layer injection or container, molded article, or parison for blow molding into a container having an internal layer having a marginal end portion and an overall leading edge which is substantially unbiased, which comprises, during injection of the stream, moving a portion of the marginal end portion of the internal layer from a location not coincident with the fast flow streamline to a location more proximate to, substantially coincident with or across from but not coincident with the fast flow streamline, and utilizing the movement of said portion of the marginal end portion of the internal layer relative to the fast flow stream line to fold over a portion of the marginal end portion, thereby providing a substantially unbiased overall leading edge of said internal layer.
Claim 68
Independent Claim
158 words
A method of injecting a multi-layer polymer stream into an injection cavity having a fast flow streamline at or near the center line of flow in the injection cavity to form a multi-layer injection or container, molded article, or parison for blow molding into a container having an internal layer having a marginal end portion and an overall leading edge which is substantially unbiased, which comprises, during injection of the stream, moving a portion of the marginal end portion of the internal layer from a location not coincident with the fast flow streamline to a location more proximate to, substantially coincident with or across from but not coincident with the fast flow streamline, and utilizing the movement of said portion of the marginal end portion of the internal layer relative to the fast flow stream line to fold over a portion of the marginal end portion, thereby providing a substantially unbiased overall leading edge of said internal layer.
Claim 69
Independent Claim
113 words
A method of forming an injection molded multi-layer rigid plastic parison for forming a blow molded container, wherein the parison has a side wall and an internal layer therein having a portion which is folded over within a marginal end portion of the side wall, which comprises, injecting a multi-layer stream into an injection cavity, and during said injection step, causing a portion of the marginal end portion of said internal layer to fold over as said portion of said layer moves into the cavity, to form a parison in said cavity having a portion of the internal layer folded over within a portion of the marginal end portion of the side wall.
Claim 70
Independent Claim
113 words
A method of forming an injection molded multi-layer rigid plastic parison for forming a blow molded container, wherein the parison has a side wall and an internal layer therein having a portion which is folded over within a marginal end portion of the side wall, which comprises, injecting a multi-layer stream into an injection cavity, and during said injection step, causing a portion of the marginal end portion of said internal layer to fold over as said portion of said layer moves into the cavity, to form a parison in said cavity having a portion of the internal layer folded over within a portion of the marginal end portion of the side wall.
Claim 71
Dependent Claim
46 words
The method of claim 41 wherein there is included the step of causing any folded over portion and the terminal end of the unfolded portion of the marginal end portion to be finally positioned in a substantially unbiased plane relative to the axis of the container.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-14 | 1991-12-14 | 1992-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-14 | 1995-12-14 | 1996-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-14 | 1999-12-14 | 2000-06-14 | $7700.00 | Window Closed / Lapsed |