US3660194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of fabricating fluid-tight containers
Assignee: Gebr HOFFMAN AG
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Filing: 1970-12-21
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Granted: 1972-05-02
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Expires: 1990-12-21
Abstract
Abstract There is disclosed a method of producing gas-tight and liquidtight containers, especially collapsible tubes wherein a strip of plastic coated carrier foil is bent or wound into the shape of a substantially cylindrical tube, the longitudinal edges of the strip being arranged in overlapping relationship. These longitudinal edges are then heat-sealed and the tube is coated with a sheath of plastic for covering the overlapping seams and providing a smooth continuous outer surface capable of receiving an imprint. Further, according to the invention the amount of plastic material and application thereof to the surface of the tube is controlled such that the outside surface of such tube when covered with the plastic sheathing possesses a shape and dimension substantially corresponding to the internal receiving wall of a mold cavity for heading the tube. The tube, typically after having been cut into finite tube sections, is then inserted at one end into a mold cavity, the outside surface of such tube section snugly fitting in good sealing relationship against the internal receiving wall of the mold cavity. The inner wall of the tube section, at least at the end region thereof received in the mold cavity is freely exposed, so that when moldable material is introduced into the mold cavity it contacts such exposed inner wall, thereby producing a substantially radially directed force applied outwardly against the inner exposed wall of the tube, urging the outer wall thereof into extreme sealing contact with the internal receiving wall of the mold cavity so that an extremely effective seal appears at the location where the tube section has been inserted into the molding cavity.
Inventors
- 👤 Arthur W Hoffmann
- 👤 Walter Buhlmann
- 👤 Pierre Locuty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:58
CPC Classifications
B; B65; B65D; B65D35/00; B65D35/02; B29; B29C; B29C53/00; B29C53/36; B29C53/38; B29C53/382; B29C53/56; B29C53/58; B29C53/581; B29C53/582; B29C63/00; B29C65/00; B29C65/02; B29C66/00; B29C66/70; B29C66/72; B29C66/723; B29C66/7234; B29D; B29D23/00; B29D23/20; B29C66/71; B29C66/7232; B29C66/72321; B29C66/72327; B29C66/72328; B29K; B29K2995/00; B29K2995/0037; B29K2995/0065; B29K2995/0067; B29L; B29L2009/00; B29L2023/00; B29L2023/20; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1036; Y10T156/1038
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
304 words
A method for the production of fluid-tight collapsible tubes provided with a tube heading, comprising the steps of coating an impervious, substantially strip-shaped carrier foil on at least one side with heat-sealable plastic, forming the coated carrier foil to the shape of the container body by overlapping these adjacent edges of the coated carrier foil, heat-sealing the adjacent overlapped edges of the coated carrier foil to form said body, and applying a plastic sheathing over the heat-sealed container body to cover the outside of the container body, controlling the application of the plastic sheathing to the container body such that the shape and dimension of the outside surface of the sheathed container body substantially corresponds to the shape and dimension of an inner wall of a mold cavity of a tube heading mold, then inserting at least an open end portion of the sheathed container body into the mold cavity of the tube heading mold, with at least the outside surface of the end portion of the sheathed container body received in the mold cavity snugly bearing in sealing contact against the inner wall of the mold cavity, and with the inner wall of at least the open end portion of the container body received in the mold being spaced from an inside wall of said mold cavity, introducing moldable plastic material into the mold cavity for forming the tube heading and into contact with the open end portion of the conTainer body, applying substantially radially directed forces to the spaced inner wall of the container body to further urge the outside surface of said end portion of the container body against the inner wall of the mold cavity to thereby prevent escape of the moldable plastic material out of the mold cavity, and completing molding of the tube heading to the container body.
Claim 2
Independent Claim
304 words
A method for the production of fluid-tight collapsible tubes provided with a tube heading, comprising the steps of coating an impervious, substantially strip-shaped carrier foil on at least one side with heat-sealable plastic, forming the coated carrier foil to the shape of the container body by overlapping these adjacent edges of the coated carrier foil, heat-sealing the adjacent overlapped edges of the coated carrier foil to form said body, and applying a plastic sheathing over the heat-sealed container body to cover the outside of the container body, controlling the application of the plastic sheathing to the container body such that the shape and dimension of the outside surface of the sheathed container body substantially corresponds to the shape and dimension of an inner wall of a mold cavity of a tube heading mold, then inserting at least an open end portion of the sheathed container body into the mold cavity of the tube heading mold, with at least the outside surface of the end portion of the sheathed container body received in the mold cavity snugly bearing in sealing contact against the inner wall of the mold cavity, and with the inner wall of at least the open end portion of the container body received in the mold being spaced from an inside wall of said mold cavity, introducing moldable plastic material into the mold cavity for forming the tube heading and into contact with the open end portion of the conTainer body, applying substantially radially directed forces to the spaced inner wall of the container body to further urge the outside surface of said end portion of the container body against the inner wall of the mold cavity to thereby prevent escape of the moldable plastic material out of the mold cavity, and completing molding of the tube heading to the container body.
Claim 3
Dependent Claim
20 words
The method as defined in claim 1, including the step of extruding the plastic sheathing over the heat-sealed container body.
Claim 4
Dependent Claim
20 words
The method as defined in claim 1, including the step of fusing the sheathing together with the coated carrier foil.
Claim 5
Dependent Claim
56 words
The method as defined in claim 1, wherein application of the plastic sheathing to the container body is controlled such that the diameter of the outside surface of the sheathed container body is only slightly smaller than the diameter of the inner wall of the mold cavity receiving the end portion of the sheathed container body.
Claim 6
Dependent Claim
42 words
The method as defined in claim 1, including the step of coating the carrier film on both sides with a layer of plastic, the plastic layer on one side having properties differing from those of the plastic layer on the other side.
Claim 7
Dependent Claim
43 words
The method as defined in claim 1, wherein the step of forming the coated carrier foil to the shape of the container body comprises bending the coated carrier foil into a substantially cylindrical tube with the edges of the foil in overlapping relationship.
Claim 8
Dependent Claim
46 words
The method as defined in claim 1, wherein the step of forming the coated carrier foil to the shape of the container body comprises winding the coated carrier foil helically to form a tube with the helically extending edges of the foil disposed in overlapping relationship.
Claim 9
Dependent Claim
47 words
The method as defined in claim 1, wherein prior to coating of the carrier foil a barrier layer sheet is applied by means of a composite plastic material on to the side of the carrier foil intended to form the inner surface of the finished collapsible tube.
Claim 10
Dependent Claim
19 words
The method as defined in claim 1, including the step of using a metal foil as the carrier foil.
Claim 11
Dependent Claim
19 words
The method as defined in claim 1, including the step of using a paper foil as the carrier foil.
Claim 12
Dependent Claim
61 words
The method as defined in claim 1, wherein prior to coating of the carrier foil a paper sheet is applied by means of a composite plastic to the side of the carrier foil intended to form the outer side of the finished collapsible tube, in order to thereby improve the adherence of a subsequently applied plastic layer to the carrier foil.
Claim 13
Dependent Claim
28 words
The method as defined in claim 11, further including the step of applying the coating of plastic material to the carrier foil by means of a slot die.
Claim 14
Dependent Claim
21 words
The method as defined in claim 1, including the step of using a carrier foil material which is impervious to light.
Claim 15
Dependent Claim
36 words
The method as defined in claim 1, including the step of cutting the sheathed container body into finite sections, each of which is then introduced into the mold cavity for heading each such container body section.
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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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |