US4512838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extruded longitudinal joint
Assignee: Tetra Pak Developpement SA
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Filing: 1983-01-20
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Granted: 1985-04-23
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Expires: 2003-01-20
Abstract
Abstract A method for joining together laminated material including layers of orientation-stretched polyester and glycol-modified polyester. A strand of molten glycol-modified polyester is applied to the laminated material along the joining area and the laminated material is pressed together while the strand is cooled. The laminated material is joined together by transferring heat from the molten strand to the pressed-on layers of the laminate. The surface portions of the layers are melted at the same time as the strand is cooled.
Inventors
- 👤 Anders R. Rausing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:02
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/02; B29C65/40; B29C65/48; B29C65/4805; B29C65/481; B29C65/4815; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/349; B29C66/40; B29C66/41; B29C66/43; B29C66/432; B29C66/4322; B29C66/49; B29C66/70; B29C66/71; B29C66/72; B29C66/723; B29C66/73; B29C66/737; B29C66/7371; B29C66/73711; B29C66/80; B29C66/83; B29C66/834; B29C66/8341; B29C66/83411; B29C66/83413; C; C08; C08J; C08J5/00; C08J5/12; C08J5/124; C08J5/128; B29C53/00; B29C53/36; B29C65/405; B29C65/50; B29C65/5057; B29C66/7232; B29C66/72321; B29C66/7234; B29C66/72341; B29K; B29K2067/00; B29K2995/00; B29K2995/0037; B29K2995/005; B29K2995/0053; B29L; B29L2009/00; B29L2031/00; B29L2031/712; C08J2367/00; C08J2367/02; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/1008; Y10T156/1013; Y10T156/1036; Y10T156/1038
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
142 words
A method for heat-sealing together two portions of orientation-stretched laminated polyester material, each portion of said material including a central layer of polyester positioned between two surface layers of glycol-modified polyester, comprising: depositing a strand of molten plastic material of sufficient size on a first one of the two surface layers of glycol-modified polyester along an intended joint area so that the strand will have sufficient heat content to heat the two surface layers of glycol-modified polyester joning a second one of the two surface layers of glycol-modified polyester to said strand so as to form a joined material having a joint area; and, fusing the first and the second surface layers of the glycol-modified polyester to the strand while cooling the joint area to prevent heat from the molten strand of plastic material from diffusing into said central layer of polyester.
Claim 2
Independent Claim
142 words
A method for heat-sealing together two portions of orientation-stretched laminated polyester material, each portion of said material including a central layer of polyester positioned between two surface layers of glycol-modified polyester, comprising: depositing a strand of molten plastic material of sufficient size on a first one of the two surface layers of glycol-modified polyester along an intended joint area so that the strand will have sufficient heat content to heat the two surface layers of glycol-modified polyester joning a second one of the two surface layers of glycol-modified polyester to said strand so as to form a joined material having a joint area; and, fusing the first and the second surface layers of the glycol-modified polyester to the strand while cooling the joint area to prevent heat from the molten strand of plastic material from diffusing into said central layer of polyester.
Claim 3
Dependent Claim
45 words
The method in accordance with claim 1 wherein the joined material has a central layer and a pair of outer layers and wherein said strand is extruded and is of a material similar to the material which constitutes the outer layers of the joined material.
Claim 4
Dependent Claim
24 words
The method in accordance with claim 1, wherein the joint area during the joining operation is cooled from the outside of the joined material.
Claim 5
Dependent Claim
17 words
The method in accordance with claim 2, wherein the extruded plastic strand is constituted of glycol-modified polyester.
Claim 6
Dependent Claim
26 words
The method in accordance with claim 4, wherein the width of the extruded strand is between 3-10 mm and that its thickness is between 100-500 μm.
Claim 7
Dependent Claim
17 words
The method in accordance with claim 5 wherein the thickness of the extruded strand is 300 μm.
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) | 1988-04-22 | 1988-10-22 | 1989-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-22 | 1992-10-22 | 1993-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-22 | 1996-10-22 | 1997-04-23 | $7700.00 | Window Closed / Lapsed |