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US4442147A
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US
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Oriented multi-layer films having a different orientation distribution between layers
Assignee: Cryovac LLC
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Filing: 1982-08-09
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Granted: 1984-04-10
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Expires: 2002-08-09
Abstract
Abstract The invention comprises an oriented multi-layer film having a different orientation distribution between at least two layers and a novel process for forming oriented multi-layer films having a different orientation distribution between the layers. An important feature is the formation of a first tubular layer which is folded and fed into the interior of a second tubular layer of smaller diameter. Upon inflation of the inner tubular layer of larger diameter to its maximum unstretched diameter the smaller diameter outer tubular layer will be stretched and will also be oriented if the stretching occurs while the temperature of the smaller diameter outer tubular layer is maintained within the orientation temperature range of that material.
Inventors
- 👤 Henry G. Schirmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:16
CPC Classifications
B; B32; B32B; B32B7/00; B32B7/03; B32B7/035; B29; B29C; B29C48/00; B29C48/001; B29C48/0013; B29C48/0015; B29C48/0016; B29C48/03; B29C48/09; B29C48/16; B29C48/18; B29C48/21; B29C55/00; B29C55/02; B29C55/023; B29C55/22; B32B1/00; B32B1/08; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/306; B32B27/308; B32B27/32; B32B27/34; B32B27/36; B32B37/00; B32B37/14; B32B37/15; B32B37/153; B32B7/02; B32B7/027; B32B2307/00; B32B2307/50; B32B2307/514; B32B2323/00; B32B2323/04; B32B2323/043; B32B2597/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/31504; Y10T428/31652; Y10T428/31667; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/31746; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31928
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
87 words
A seamless multi-layer film comprising: an outer layer having a melting point and an orientation temperature range; an inner layer having a melting point and an orientation temperature range; wherein the orientation temperature range of said inner layer is substantially higher than the orientation temperature range of said outer layer and the melting point of said inner layer is substantially higher than both the melting point and the orientation temperature range of said outer layer; and with said inner and outer layers having a different orientation distribution.
Claim 2
Dependent Claim
87 words
A seamless multi-layer film comprising: an outer layer having a melting point and an orientation temperature range; an inner layer having a melting point and an orientation temperature range; wherein the orientation temperature range of said inner layer is substantially higher than the orientation temperature range of said outer layer and the melting point of said inner layer is substantially higher than both the melting point and the orientation temperature range of said outer layer; and with said inner and outer layers having a different orientation distribution.
Claim 3
Dependent Claim
18 words
The multi-layer film of claim 1, comprising a longitudinally oriented inner layer and a transversely oriented outer layer.
Claim 4
Dependent Claim
17 words
The multi-layer film of claim 1, comprising an unoriented inner layer and a transversely oriented outer layer.
Claim 5
Dependent Claim
12 words
The multi-layer film of claim 1, comprising at least one multi-ply layer.
Claim 6
Dependent Claim
13 words
The multi-layer film of claim 1, wherein said film comprises a tubular structure.
Claim 7
Dependent Claim
18 words
The multi-layer film of claim 2, comprising a longitudinally oriented innermost layer and a transversely oriented outermost layer.
Claim 8
Dependent Claim
17 words
The multi-layer film of claim 3, comprising an unoriented innermost layer and a transversely oriented outermost layer.
Claim 9
Dependent Claim
22 words
The multi-layer film of claim 4, comprising an inner layer and an outer layer comprising an inner ply and an outer ply.
Claim 10
Dependent Claim
22 words
The multi-layer film of claim 4, comprising an outer layer and an inner layer comprising an inner ply and an outer ply.
Claim 11
Dependent Claim
54 words
The multi-layer film of claim 8, wherein said outer ply consists of nylon, said inner ply consists of a blend of a graft copolymer of a high density polyethylene and at least one unsaturated, fused ring, carboxylic acid anhydride blended with a polyethylene resin and an alpha-olefin and said inner ply consists of nylon.
Claim 12
Dependent Claim
28 words
The multi-layer film of claim 8, wherein said outer ply consists of polyethylene said inner ply consists of ethylene methyl acrylate and said inner layer consists of polyethylene.
Claim 13
Dependent Claim
20 words
The seamless film of claim 1, wherein a lubricating material is located on an outer surface of said inner layer.
Claim 14
Dependent Claim
13 words
The seamless film of claim 12, wherein said lubricating film comprises corn starch.
Claim 15
Dependent Claim
12 words
The seamless film of claim 12, wherein said lubricating film comprises silica.
Claim 16
Dependent Claim
53 words
The multi-layer film of claim 8, wherein said outer ply consists of nylon, said inner ply consists of a blend of a graft copolymer of a high density polyethylene and at least one unsaturated, fused ring, carboxylic acid anhydride blended with one or more resin copolymers of ethylene and an ethylenically unsaturated ester.
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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) | 1987-04-10 | 1987-10-10 | 1988-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-10 | 1991-10-10 | 1992-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-10 | 1995-10-10 | 1996-04-10 | $7700.00 | Window Closed / Lapsed |