Patent US4499706A successfully refreshed from Google Patents.
US4499706A
Expired / Lapsed
US
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Pass through stretch wrapping process
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1983-05-19
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Granted: 1985-02-19
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Expires: 2003-05-19
Abstract
Abstract A double layer thermoplastic film is used in Pass-Through stretch wrapping of goods. The double layer improves the tear resistance and puncture resistance of the film.
Inventors
- 👤 Andor Scheller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:15
CPC Classifications
B; B65; B65B; B65B9/00; B65B9/02; B65B9/026; B65B11/00; B65B11/58; B65B11/585; B65D; B65D71/00; B65D71/0088; B65D71/0092; B65D71/0096; B65D2571/00; B65D2571/00006; B65D2571/00012; B65D2571/00018; B65D2571/0003
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
98 words
A method of bundling a body of goods which comprise stretching under tension a dual layer film of a thermoplastic circumferentially around the body, and joining the film together at a line where the film meets to encircle the body; said film having sufficient elongation to permit at least 10% stretching under tension and sufficient slip between the layers of the film to permit relative slippage, and wherein the molecules of one layer of the film are aligned generally crosswise of the molecules of the second layer of film thereby increasing tear resistance of the dual layer film.
Claim 2
Independent Claim
98 words
A method of bundling a body of goods which comprise stretching under tension a dual layer film of a thermoplastic circumferentially around the body, and joining the film together at a line where the film meets to encircle the body; said film having sufficient elongation to permit at least 10% stretching under tension and sufficient slip between the layers of the film to permit relative slippage, and wherein the molecules of one layer of the film are aligned generally crosswise of the molecules of the second layer of film thereby increasing tear resistance of the dual layer film.
Claim 3
Dependent Claim
29 words
The method as defined in claim 1 wherein the film is a copolymer of ethylene and an alpha-olefin and wherein each layer is no more than 2 mils thick.
Claim 4
Dependent Claim
21 words
The method as defined in claim 1 wherein the film has a coefficient of friction of between about 0.2 and 0.5.
Claim 5
Dependent Claim
115 words
In a pass through, stretch packaging process wherein two film webs joined together on one side of a body of goods to be packaged are stretched in opposite directions circumferentially around the body and with the tension retained, the web portions are joined together on the side opposite said one side by heat sealing, the improvement wherein the film webs are flattened tubes of a thermoplastic having (a) sufficient elasticity to permit said stretching and (b) sufficient slippage to permit the film layers to slide relative to one another during the stretching operation; the molecules of one layer of the tube are oriented generally crosswise of the molecules of the second layer of the tube.
Claim 6
Dependent Claim
115 words
In a pass through, stretch packaging process wherein two film webs joined together on one side of a body of goods to be packaged are stretched in opposite directions circumferentially around the body and with the tension retained, the web portions are joined together on the side opposite said one side by heat sealing, the improvement wherein the film webs are flattened tubes of a thermoplastic having (a) sufficient elasticity to permit said stretching and (b) sufficient slippage to permit the film layers to slide relative to one another during the stretching operation; the molecules of one layer of the tube are oriented generally crosswise of the molecules of the second layer of the tube.
Claim 7
Dependent Claim
28 words
The method of claim 4 wherein each film layer has a thickness of between 0.5 and 2.0 mils and a coefficient of friction of between 0.2 and 0.5.
Claim 8
Dependent Claim
15 words
The process of claim 1 wherein the thermoplastic is a homopolymer or copolymer of ethylene.
Claim 9
Dependent Claim
16 words
The process of claim 4 wherein the thermoplastic is a copolymer of ethylene and an alpha-olefin.
Claim 10
Dependent Claim
15 words
The process of claim 7 wherein the copolymer is produced by a low pressure process.
Claim 11
Dependent Claim
31 words
The process of claim 4 wherein the film further includes upper and lower gussets aligned to wrap around the upper portion and lower portion respectively of the goods to be packaged.
Claim 12
Dependent Claim
18 words
The process of claim 4 wherein the film comprises a flattened tube produced by the blown film method.
References Cited (Backward Citations)
US3884016A
Cited
US3986611A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-19 | 1988-08-20 | 1989-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-19 | 1992-08-20 | 1993-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-19 | 1996-08-20 | 1997-02-19 | $7700.00 | Window Closed / Lapsed |