CA1222485A
Expired / Lapsed
CA
⏱️ 0.0 years remaining
Easy open bag having rupture strip
Assignee: Cryovac LLC
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Filing: 1983-08-03
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Granted: 1987-06-02
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Expires: 2003-08-03
Abstract
Abstract EASY OPEN BAG HAVING RUPTURE STRIP ABSTRACT OF THE DISCLOSURE An easy open package is provided that comprises a side-sealed bag of multiply thermoplastic film having inside and outside plies char-acterized in that inside-to-inside ply heat seal strength is greater than inside-to-outside ply heat seal strength; and a rupture strip of film, being the same material as the film of said bag, interposed between the surfaces of the mouth of said bag, said bag mouth being heat sealed through said strip forming one inside-to-inside type heat seal and at least one inside-to-outside type heat seal. Preferably, said easy open package further includes a reclosure element, and the inside ply of the film of said package is irradiatively cross-linked. An associated method for making said package is also provided.
Inventors
- 👤 Milton A. Howe, Jr., (Deceased)
Bibliographic Details
Application Number
—
Jurisdiction
CA
Data Source
google_patents
Last Synchronized
2026-11-05 09:28
CPC Classifications
—
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
84 words
An easy open package, comprising: a) a side-sealed bag of multiply thermoplastic film having inside and outside plies characterized in that inside-to-inside ply heat seal strength is greater than inside-to-outside ply heat seal strength; nd b) a rupture strip of film, being the same material as the film of said bag, interposed between the surfaces of the mouth of said bag, said bag mouth being heat sealed through said strip forming one inside-to-inside type heat seal and at least one inside-to-outside type heat seal.
Claim 2
Dependent Claim
84 words
An easy open package, comprising: a) a side-sealed bag of multiply thermoplastic film having inside and outside plies characterized in that inside-to-inside ply heat seal strength is greater than inside-to-outside ply heat seal strength; nd b) a rupture strip of film, being the same material as the film of said bag, interposed between the surfaces of the mouth of said bag, said bag mouth being heat sealed through said strip forming one inside-to-inside type heat seal and at least one inside-to-outside type heat seal.
Claim 3
Dependent Claim
28 words
The package of claim 1 wherein said strip extends across the width of said bag and is spaced below the mouth-end termini of the side-seals of said bag.
Claim 4
Dependent Claim
10 words
The package of claim 1 further comprising a reclosure element.
Claim 5
Dependent Claim
18 words
The package of claim 3 wherein said reclosure element is an elongate dead-fold element adhered to said strip.
Claim 6
Dependent Claim
14 words
The package of claim 4 wherein said dead-fold element is coex-tensive with said strip.
Claim 7
Dependent Claim
25 words
The package of claim 1 wherein said strip is folded so that at the bag-strip interfaces their respective plies confront in an inside-to-outside ply configuration.
Claim 8
Dependent Claim
10 words
The package of claim 6 further comprising a reclosure element.
Claim 9
Dependent Claim
26 words
The package of claim 7 wherein said reclosure element is an elongate dead-fold element inside the fold of said strip and lies above said mouth seal.
Claim 10
Dependent Claim
14 words
The package of claim 8 wherein said dead-fold element is coex-tensive with said strip.
Claim 11
Dependent Claim
15 words
The package of claim 1 or 2 wherein the bottom of said bag is open.
Claim 12
Dependent Claim
22 words
The package of claim 1 or 2 wherein said bag contains a product and the bottom of said bag is heat sealed.
Claim 13
Dependent Claim
38 words
The package of claim 1 wherein said multiply film has an outer abuse layer, an interior barrier layer, and an inner shrink layer, further provided that said inner layer is crosslinked and said outer layer is not crosslinked.
Claim 14
Dependent Claim
19 words
The package of claim 12 wherein said outer layer and said inner layer are of substantially the same composition.
Claim 15
Dependent Claim
60 words
The package of claim 12 wherein said film is three-ply having an outer layer selected from the group consisting of polyethylene and ethylene-vinyl acetate copolymers; an interior layer selected from the group consisting of nylon, vinylidene chloride copolymers, and propylene homopolymers and copolymers; and an inner layer selected from the group consisting of irradiatively cross-linked polyethylene and ethylene-vinyl acetate copolymers.
Claim 16
Independent Claim
136 words
A method for making an easy open bag, comprising: a) providing for the panels of said bag two opposingly facing sheets of a multiply thermoplastic film having inside and outside plies characterized in that inside-to-inside ply heat seal strength is greater than inside-to-outside ply heat seal strength; b) interposing a rupture strip of film, being the same mate-rial as the film of said bag, between said sheets toward and substan-tially parallel to a transverse edge of said sheet pair: c) forming side heat seals across said sheet pair being transverse said strip direction and spaced equal to the interior width of said bag; and then d) forming a bag mouth heat seal along said strip such that there is one inside-to-inside type heat seal and at least one inside-to-outside type heat seal within said mouth seal.
Claim 17
Independent Claim
136 words
A method for making an easy open bag, comprising: a) providing for the panels of said bag two opposingly facing sheets of a multiply thermoplastic film having inside and outside plies characterized in that inside-to-inside ply heat seal strength is greater than inside-to-outside ply heat seal strength; b) interposing a rupture strip of film, being the same mate-rial as the film of said bag, between said sheets toward and substan-tially parallel to a transverse edge of said sheet pair: c) forming side heat seals across said sheet pair being transverse said strip direction and spaced equal to the interior width of said bag; and then d) forming a bag mouth heat seal along said strip such that there is one inside-to-inside type heat seal and at least one inside-to-outside type heat seal within said mouth seal.
Claim 18
Dependent Claim
17 words
The method of claim 15 wherein the length of said strip is less than said side-seal spacing.
Claim 19
Dependent Claim
31 words
The method of claim 15 wherein the length of said strip is at least equal to said side-seal spacing, provided that said strip is spaced from the termini of said side-seals.
Claim 20
Dependent Claim
37 words
The method of claim 16 or 17 further comprising folding said strip such that in forming said bag mouth heat seal there is formed one inside-to-inside type heat seal and at least two inside-to-outside type heat seals.
Claim 21
Dependent Claim
16 words
The method of claim 16 or 17 further comprising continuously forming a series of said bags.
Claim 22
Dependent Claim
12 words
The method of claim 16 further comprising providing an integral reclosure element.
Claim 23
Dependent Claim
16 words
The method of claim 20 further comprising securing an elongate dead-fold element coextensively with said strip.
Claim 24
Dependent Claim
38 words
The method of claim 16 wherein said multiply film has an outer abuse layer, an interior barrier layer, and an inner shrink layer, further provided that said inner layer is crosslinked and said outer layer is not crosslinked.
Claim 25
Dependent Claim
19 words
The method of claim 22 wherein said outer layer and said inner layer are of substantially the same composition.
Claim 26
Dependent Claim
60 words
The method of claim 22 wherein said film is three-ply having an outer layer selected from the group consisting of polyethylene and eth-ylene-vinyl acetate copolymers; an interior layer selected from the group consisting of nylon, vinylidene chloride copolymers, and propylene homo-polyers and copolymers; and an inner layer selected from the group con-sisting of irradiatively cross-linked polyethylene and ethylene-vinyl acetate copolymers.
References Cited (Backward Citations)
No citation records indexed.
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