US4957679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making interfolded sheets of plastic film
Assignee: Georgia Pacific Consumer Products LP
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Filing: 1989-07-24
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Granted: 1990-09-18
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Expires: 2009-07-24
Abstract
Abstract When a film consisting of high density polyethylene and about three percent polystyrene is run on an interfolding machine to produce interfolded sheets of the film for use as deli wrap, the film is completely and consistently cut in the machine into sheets that are entirely separated from adjacent sheets. In comparison, sheets made from film consisting of 100 percent high density polyethylene are not consistently completely separated from adjacent sheets.
Inventors
- 👤 Neal E. Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:06
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; B; B29; B29D; B29D7/00; B29D7/01; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2023/0608; B29K2023/065; B29K2105/00; B29K2105/0088; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
86 words
A method of producing interfolded sheets of plastic film containing at least eighty percent high density polyethylene comprising cutting a continuous length of the film with a knife blade into separate sheets and interfolding the sheets, the improvement wherein the film contains from about one to about twenty percent of a styrene polymer selected from the group consisting of polystyrene, poly(p-methylstyrene), rubber-modified polystyrene, and rubber-modified poly(p-methylstyrene), whereby the sheets are more completely cut by the blade and thereby more completely and consistently separated from adjacent sheets.
Claim 2
Independent Claim
86 words
A method of producing interfolded sheets of plastic film containing at least eighty percent high density polyethylene comprising cutting a continuous length of the film with a knife blade into separate sheets and interfolding the sheets, the improvement wherein the film contains from about one to about twenty percent of a styrene polymer selected from the group consisting of polystyrene, poly(p-methylstyrene), rubber-modified polystyrene, and rubber-modified poly(p-methylstyrene), whereby the sheets are more completely cut by the blade and thereby more completely and consistently separated from adjacent sheets.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein the styrene polymer is polystyrene or poly(p-methylstyrene).
Claim 4
Dependent Claim
11 words
The method of claim 1 wherein the styrene polymer is polystyrene.
Claim 5
Dependent Claim
19 words
The method of claim 2 wherein the film contains from about one to ten percent of the styrene polymer.
Claim 6
Dependent Claim
11 words
The method of claim 4 wherein the styrene polymer is polystyrene.
Claim 7
Dependent Claim
19 words
The method of claim 2 wherein the film contains from about two to five percent of the styrene polymer.
Claim 8
Dependent Claim
11 words
The method of claim 6 wherein the styrene polymer is polystyrene.
Claim 9
Dependent Claim
29 words
The method of claim 1 wherein the film consists essentially of from about 2 to 5 percent polystyrene and correspondingly from about 95 to 98 percent high density polyethylene.
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) | 1993-09-17 | 1994-03-19 | 1994-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-17 | 1998-03-19 | 1998-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-17 | 2002-03-19 | 2002-09-18 | $7700.00 | Window Closed / Lapsed |