US4615925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Barrier-coated tube of biaxially stretched thermoplastic material having a monoaxially stretched barrier coating thereon
Assignee: Rexam AB
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Filing: 1983-04-25
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Granted: 1986-10-07
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Expires: 2003-04-25
Abstract
Abstract A method for providing a container with one or more layers of barrier material during the production of the container from a thermoplastic. A preform (10) is stretched in its axial direction, generally an amount corresponding to the total axial stretching required for conversion of the preform to a container, after which the stretched preform (11, 13) is provided with one or more barrier layers (12, 14), and the preform is then heated and converted to a container. In one embodiment, the axially stretched preform (15) is produced by assembling axially stretched part-preforms (13a, b) covered with one or more barrier layers. The combined preform is then converted to a container. By means of the invention, it is possible to reduce the thickness of the barrier layers at the time of their application, which considerably simplifies the latter.
Inventors
- 👤 Claes T. Nilsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:39
CPC Classifications
B; B29; B29C; B29C67/00; B29C67/0003; B29C31/00; B29C31/002; B29C49/00; B29C49/08; B29C49/10; B29C49/14; B29C49/42; B29C49/48; B29C49/54; B29C49/541; B29C55/00; B29C55/30; B29C59/00; B29C59/02; B29C59/04; B29C59/043; B29C67/0014; B65; B65D; B65D1/00; B65D1/02; B65D1/0207; B65D1/0223; B29C43/00; B29C43/32; B29C43/36; B29C43/361; B29C2043/3615; B29C2043/3618; B29C2043/3631; B29C2049/4879; B29C2049/4892; B29C2793/00; B29C2793/009; B29C2949/00; B29C2949/07; B29C2949/079; B29C2949/08; B29C2949/0861; B29C2949/0862; B29C2949/0863; B29C2949/0865; B29K; B29K2067/00; B29K2105/00; B29K2105/25; B29K2105/253; B29K2105/258; Y; Y10; Y10S; Y10S264/00; Y10S264/90; Y10S264/904; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
53 words
A barrier-coated article comprising a tube of thermoplastic material which has been axially stretched from an amorphic condition to provide a wall of reduced thickness having monoaxially oriented crystallinity, and a barrier layer on said wall, said tube having been circumferentially expanded after axial stretching, said barrier layer being stretched substantially only circumferentially.
Claim 2
Dependent Claim
53 words
A barrier-coated article comprising a tube of thermoplastic material which has been axially stretched from an amorphic condition to provide a wall of reduced thickness having monoaxially oriented crystallinity, and a barrier layer on said wall, said tube having been circumferentially expanded after axial stretching, said barrier layer being stretched substantially only circumferentially.
Claim 3
Dependent Claim
26 words
An article as claimed in claim 1 wherein said wall has inner and outer surfaces, said barrier layer comprising a coating on one of said surfaces.
Claim 4
Dependent Claim
25 words
An article as claimed in claim 1 wherein said tube is axially stretched a multiple of its original length to produce the monoaxially oriented crystallinity.
Claim 5
Dependent Claim
16 words
An article as claimed in claim 1 wherein said barrier layer is substantially of uniform thickness.
Claim 6
Dependent Claim
39 words
An article as claimed in claim 1 wherein said thermoplastic material is polyethylene terephthalate and in amorphous state has a crystallinity of less than 10% and in axially stretched state has a monoaxial crystallinity of between 10 and 25%.
Claim 7
Dependent Claim
32 words
An article as claimed in claim 5 wherein said crystallinity in the amorphous state is less than 5% and the monoaxial crystallinity in the axially stretched state is a maximum of 17%.
Claim 8
Dependent Claim
34 words
A barrier coated article comprising a tube of thermoplastic material including a wall having axially oriented crystallinity and being circumferentially stretched, and a barrier layer on said wall which is stretched substantially only monoaxially.
Claim 9
Dependent Claim
34 words
A barrier coated article comprising a tube of thermoplastic material including a wall having axially oriented crystallinity and being circumferentially stretched, and a barrier layer on said wall which is stretched substantially only monoaxially.
Claim 10
Dependent Claim
18 words
An article as claimed in claim 7 wherein the monoaxial stretching of said barrier layer is substantially circumferential.
Claim 11
Dependent Claim
16 words
An article as claimed in claim 8 wherein said barrier layer is substantially of uniform thickness.
Claim 12
Dependent Claim
26 words
An article as claimed in claim 8 wherein said wall has inner and outer surfaces, said barrier layer comprising a coating on one of said surfaces.
Claim 13
Dependent Claim
46 words
An article as claimed in claim 7 wherein said tube is axially stretched a multiple of its original length to produce said axially oriented crystallinity, and is circumferentially stretched a multiple of its original diameter to produce crystallinity circumferentially and circumferential stretching of said barrier layer.
Claim 14
Dependent Claim
39 words
An article as claimed in claim 8 wherein said thermoplastic material is polyethylene terephthalate and in amorphous state has a crystallinity of less than 10% and in axially stretched state has a monoaxial crystallinity of between 10 and 25%.
Claim 15
Dependent Claim
32 words
An article as claimed in claim 8 wherein said crystallinity in the amorphous state is less than 5% and the monoaxial crystallinity in the axially stretched state is a maximum of 17%.
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) | 1989-10-06 | 1990-04-07 | 1990-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-06 | 1994-04-07 | 1994-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-06 | 1998-04-07 | 1998-10-07 | $7700.00 | Window Closed / Lapsed |