US4875587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Easy open shrinkable laminate
Assignee: Cryovac LLC
•
Filing: 1988-03-03
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Granted: 1989-10-24
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Expires: 2008-03-03
Abstract
Abstract An easily opened package suitable for food products such as ring sausage and the like includes a first web with a sealant layer of ethylene vinyl acetate copolymer and an ionomer, and a second web including a sealant layer of an ionomer. A resulting package exhibits good self-welding characteristics and seal strength, and an easily peelable seal.
Inventors
- 👤 Cedric M. Lulham
- 👤 George D. Wofford
- 👤 John G. Bradfute
- 👤 Steven G. Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:38
CPC Classifications
B; B65; B65D; B65D75/00; B65D75/52; B65D75/58; B65D75/5855; A; A22; A22C; A22C13/00; A22C13/0013; B32; B32B; B32B27/00; B32B27/32; A22C2013/002; A22C2013/0036; A22C2013/0059; A22C2013/0086; B65D75/26; B65D75/28; B65D75/30; B65D75/32
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
141 words
An easy to open package comprising: (a) first and second webs having an article positioned therebetween; (b) each web having a self-welding sealant layer on one of its surfaces, said self-welding surfaces being adhered to each other around at least a portion of the periphery of said article; (c) said sealant layers being further sealed to each other in a fusion seal around the article thereby enclosing said article; (d) the bond between the sealant layer and the layer adjacent to it in the second web being weaker in the fusion seal area than the adhesion between the two sealant layers whereby when self-welded portions of the webs are peeled apart and the peeling action reaches the fusion seal area the sealant layer of the second web will tear out in the fusion seal area thus permitting access to the article.
Claim 2
Dependent Claim
141 words
An easy to open package comprising: (a) first and second webs having an article positioned therebetween; (b) each web having a self-welding sealant layer on one of its surfaces, said self-welding surfaces being adhered to each other around at least a portion of the periphery of said article; (c) said sealant layers being further sealed to each other in a fusion seal around the article thereby enclosing said article; (d) the bond between the sealant layer and the layer adjacent to it in the second web being weaker in the fusion seal area than the adhesion between the two sealant layers whereby when self-welded portions of the webs are peeled apart and the peeling action reaches the fusion seal area the sealant layer of the second web will tear out in the fusion seal area thus permitting access to the article.
Claim 3
Dependent Claim
36 words
The easy to open package of claim 1 wherein the sealant layer of the first web comprises a blend of ethylene/vinyl-acetate copolymer and an ionomer; and, the sealant layer of the second web comprises an ionomer.
Claim 4
Dependent Claim
23 words
The easy to open package of claim 2 wherein the second web comprises an ethylene/vinyl-acetate copolymer layer adjacent to the ionomer sealant layer.
Claim 5
Dependent Claim
24 words
The easy to open package of claim 3 wherein the sealant layer of the second web is between 0.2 and 0.5 mils in thickness.
Claim 6
Dependent Claim
13 words
The package of claim 1 wherein the enclosed article is a food product.
Claim 7
Independent Claim
210 words
A method of making an easy to open package comprising the steps: (a) providing first and second webs having an article positioned therebetween with each web having a sealant layer on one of its surfaces; the sealant layer of the first web comprising a blend of ethylene/vinyl-acetate copolymer and an ionomer, and the sealing layer of the second web comprising an ionomer having a thickness between 0.2 and 0.3 mils; (b) positioning the sealant layers of each web in fact-to-face relationship to each other with one web superimposed over the other so that the edges along a side of each web terminate approximately congruently thereby providing web edges along at least one side of the article which may be gripped and peeled apart; (c) sealing said sealant layers to each other with heat and pressure to form a fusion seal, said seal being located between said one edge and the article, the bond between the sealant layer and the layer adjacent to it in the second web being weaker in the fusion seal area than the adhesion between the two sealant layers whereby when the webs are peeled apart the sealant layer of the second web will tear out in the fusion seal area thus permitting access to the article.
Claim 8
Independent Claim
210 words
A method of making an easy to open package comprising the steps: (a) providing first and second webs having an article positioned therebetween with each web having a sealant layer on one of its surfaces; the sealant layer of the first web comprising a blend of ethylene/vinyl-acetate copolymer and an ionomer, and the sealing layer of the second web comprising an ionomer having a thickness between 0.2 and 0.3 mils; (b) positioning the sealant layers of each web in fact-to-face relationship to each other with one web superimposed over the other so that the edges along a side of each web terminate approximately congruently thereby providing web edges along at least one side of the article which may be gripped and peeled apart; (c) sealing said sealant layers to each other with heat and pressure to form a fusion seal, said seal being located between said one edge and the article, the bond between the sealant layer and the layer adjacent to it in the second web being weaker in the fusion seal area than the adhesion between the two sealant layers whereby when the webs are peeled apart the sealant layer of the second web will tear out in the fusion seal area thus permitting access to the article.
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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) | 1992-10-23 | 1993-04-24 | 1993-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-23 | 1997-04-24 | 1997-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-23 | 2001-04-24 | 2001-10-24 | $7700.00 | Window Closed / Lapsed |