Patent US3761211A successfully refreshed from Google Patents.
US3761211A
Expired / Lapsed
US
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Multi-layer extrusion apparatus
Assignee: Crompton and Knowles Corp
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Filing: 1972-01-17
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Granted: 1973-09-25
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Expires: 1992-01-17
Abstract
Abstract An extrusion apparatus die assembly for producing laminated film, the apparatus includes a die block which has a die passage leading to a pair of die lips through which thermoplastic materials can be extruded, an adaptor connected to the die block and having a main channel connected to the die passage, a pair of feed channels which converge into the main channel and a valving means located at the point of convergence of the feed channels for controlling the relative flow of thermoplastic materials from the feed channels into the main channel.
Inventors
- 👤 E Parkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:09
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/305; B29C48/307; B29C48/03; B29C48/07; B29C48/08; B29C48/16; B29C48/18; B29C48/21
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
132 words
Extrusion apparatus for producing a multi-layer sheet of diverse thermopLastic materials comprising: a. A die block including a pair of die lips through which said thermoplastic materials can be extruded as a multi-layer sheet, said die block having a die passage for conveying thermoplastic material to said die lips; b. An adaptor having a main channel connected to said die passage and a pair of feed channels converging into said main channel for conveying diverse thermoplastic materials to said main channel; and c. A proportioning valve located in said adaptor so as to form the point where said feed channels converge into said main channel for selectively proportioning the relative flow of thermoplastic materials between said feed channels while maintaining the total flow of said thermoplastic materials through said feed channels constant.
Claim 2
Dependent Claim
132 words
Extrusion apparatus for producing a multi-layer sheet of diverse thermopLastic materials comprising: a. A die block including a pair of die lips through which said thermoplastic materials can be extruded as a multi-layer sheet, said die block having a die passage for conveying thermoplastic material to said die lips; b. An adaptor having a main channel connected to said die passage and a pair of feed channels converging into said main channel for conveying diverse thermoplastic materials to said main channel; and c. A proportioning valve located in said adaptor so as to form the point where said feed channels converge into said main channel for selectively proportioning the relative flow of thermoplastic materials between said feed channels while maintaining the total flow of said thermoplastic materials through said feed channels constant.
Claim 3
Dependent Claim
57 words
An extrusion die assembly as described in claim 1 wherein said channels are substantially narrower than said die lips and said die passage is the same width as said channels at the point where it is connected to said main channel and widens toward said die lips until it is the same width as said die lips.
Claim 4
Dependent Claim
73 words
An extrusion die assembly as described in claim 1 wherein said valve is pivotally mounted between said feed channels and having an elongated wedge shaped portion in which forms the dividing barrier between said feed channels in the area of and including the point of convergence of said feed channels so that the pivoting of said valve will widen one of said feed channels and constrict the other at said point of convergence.
Claim 5
Dependent Claim
61 words
An extrusion apparatus as described in claim 1 wherein one of said feed channels is split into two branch feed channels for conveying diverse thermoplastic material and there is a branch proportioning valve located at the converging point of said branch feed channels for controlling the relative flow of thermoplastic material from said branch feed channels to said one feed channel.
Claim 6
Dependent Claim
66 words
An extrusion apparatus as described in claim 1 wherein said die block has a third feed channel which converges with one of said pair of feed channels at the point where they converge into said main channel and there is a second proportioning valve located at said point for controlling the relative flow of thermoplastic material between said third feed channel and said one feed channel.
Claim 7
Dependent Claim
95 words
An adaptor for a thermoplastic extrusion die having a pair of die lips through which said thermoplastic material can be extruded an elongated die inlet and a die passage for conveying thermoplastic material from said die inlet to said lips, said adaptor having a main channel connected to said die passage, a plurality of feed channels, converging into said main channel, and valve means forming the point of convergence of said feed channels for selectively controlling the relative flow of thermoplastic materials between said feed channels while maintaining the total flow of said materials constant.
Claim 8
Dependent Claim
95 words
An adaptor for a thermoplastic extrusion die having a pair of die lips through which said thermoplastic material can be extruded an elongated die inlet and a die passage for conveying thermoplastic material from said die inlet to said lips, said adaptor having a main channel connected to said die passage, a plurality of feed channels, converging into said main channel, and valve means forming the point of convergence of said feed channels for selectively controlling the relative flow of thermoplastic materials between said feed channels while maintaining the total flow of said materials constant.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |