US4856650A
Expired / Lapsed
US
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Oxygen absorbent package
Assignee: Mitsubishi Gas Chemical Co Inc
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Filing: 1987-10-26
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Granted: 1989-08-15
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Expires: 2007-10-26
Abstract
Abstract An oxygen absorbent package used for preservation or storage of foodstuff is disclosed. The package is partly or wholy formed with an air-permeable sheet obtained by making a sheet from plastic fiber, drying the sheet, impregnating it with a fluorine resin and pressing the resin-impregnated sheet by heated rolls. The obtained package has high proofness against water and oils. Use of the air-permeable sheet in combination with a specific porous composite film or porous low softening point resin film provides a package further improved in heat resistance, etc. Furthermore, an oxygen absorbent package used for storage of a retort food is also disclosed.
Inventors
- 👤 Yoshiaki Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:55
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/12; A; A23; A23B; A23B2/00; A23B2/70; A23B2/704; A23B2/708; A23B2/712; A23B2/717; B32B3/00; B32B3/26; B32B3/266; B32B33/00; B65; B65D; B65D81/00; B65D81/24; B65D81/26; B65D81/266; B65D81/268; D; D21; D21H; D21H27/00; D21H27/10; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/04; B32B2260/046; B32B2305/00; B32B2305/08; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/70; B32B2307/724; B32B2307/74; B32B2439/00; B32B2439/70; D21H13/00; D21H13/10; D21H17/00; D21H17/20; D21H17/33; D21H17/34; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24322
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
63 words
An oxygen absorbent package comprising a package made of an oxygen absorbent packed in said package and a packaging material which is at least partly formed from an air-permeable sheet obtained by making a sheet from plastic fiber by wet processing of the plastic fiber, drying the sheet, impregnating the sheet with a fluorine resin and pressing the resin-impregnated sheet by heated rolls.
Claim 2
Dependent Claim
63 words
An oxygen absorbent package comprising a package made of an oxygen absorbent packed in said package and a packaging material which is at least partly formed from an air-permeable sheet obtained by making a sheet from plastic fiber by wet processing of the plastic fiber, drying the sheet, impregnating the sheet with a fluorine resin and pressing the resin-impregnated sheet by heated rolls.
Claim 3
Dependent Claim
28 words
A package according to claim 1 wherein the size of the width of said fiber is 50μ or less, and the fiber length is 0.1 to 200 mm.
Claim 4
Dependent Claim
32 words
A package according to claim 1 wherein the amount of fluorine resin impregnated in the sheet is 0.1 to 10 parts by weight to 100 parts by weight of said plastic fiber.
Claim 5
Dependent Claim
36 words
A package according to claim 1 wherein pressing of the resin-impregnated sheet by heated rolls is carried out at a temperature of 120° to 140° C. under a pressure of 0.5 to 6 kg/cm 2 .
Claim 6
Dependent Claim
18 words
A package according to claim 1 wherein the thickness of said air-permeable sheet is 1 mm or less.
Claim 7
Dependent Claim
16 words
A package according to claim 1 wherein said air-permeable sheet is laminated with a reinforcing material.
Claim 8
Dependent Claim
66 words
A package according to claim 6 wherein said reinforcing material comprises yarns obtained by cutting a stretched or non-stretched film made by bonding a low-density polyethylene having a melting point of 120° C. or below, an ethylene-vinyl acetate copolymer or an ethylene-acrylic ester copolymer to both sides of a high-density polyethylene film, said yarns being interwoven into a lattice pattern and fusion bonded to each other.
Claim 9
Dependent Claim
24 words
A package according to claim 6 wherein lamination of said air-permeable sheet and said reinforcing material is accomplished by hot press using heated rolls.
Claim 10
Dependent Claim
42 words
A package according to claim 1 wherein said air-permeable sheet is laminated with a porous low softening point resin film, and the laminate is tucked in with said low softening point resin film positioned on the inside and is heat sealed edgewise.
Claim 11
Dependent Claim
29 words
A package according to claim 9 wherein said low softening point resin film is selected from the group consisting of polyethylene film, vinyl acetate copolymer film and ionomer film.
Claim 12
Dependent Claim
78 words
A package according to claim 1 comprising a packaging material prepared by bonding said air-permeable sheet to the low softening point resin layer side of a composite film formed by laminating a resin layer having a lower softening point than the plastic fiber constituting said air-permeable sheet and a resin layer having a higher softening point than said plastic fiber, said packaging material being formed into a package so that said air-permeable sheet side forms the inner surface.
Claim 13
Dependent Claim
12 words
A package according to claim 11 wherein said composite film is porous.
Claim 14
Dependent Claim
56 words
A package according to claim 12 wherein the resin constituting the low softening point resin layer of said porous composite film is selected from the group consisting of polyethylene, polypropylene, ethylene-vinyl acetate copolymer and ethyl acrylate-ethylene copolymer, and the resin constituting the high softening point resin layer of said composite sheet is nylon or polyethylene terephthalate.
Claim 15
Dependent Claim
17 words
A package according to claim 12 wherein the thickness of said composite film is 300μ or less.
Claim 16
Dependent Claim
18 words
A package according to claim 12 wherein the porosity of said porous composite film is 1 to 30%.
Claim 17
Dependent Claim
31 words
A package according to claim 12 wherein the size of openings of said porous composite film is 10 mm or less and the number of openings is 100 openings/m 2 .
Claim 18
Dependent Claim
17 words
A package according to claim 12 wherein said composite film is perforated by irradiation of laser beams.
Claim 19
Dependent Claim
56 words
A package according to claim 11 wherein the resin constituting the low softening point resin layer of said porous composite sheet is selected from the group consisting of polyethylene, polypropylene, ethylene-vinyl acetate copolymer, and ethyl acrylate-ethylene copolymer, and the resin constituting the high softening point resin layer of said composite sheet is nylon or polyethylene terephthalate.
Claim 20
Dependent Claim
17 words
A package according to claim 11 wherein the thickness of said composite film is 300μ or less.
Claim 21
Dependent Claim
113 words
A package according to claim 1 comprising a pair of laminates each including of said air-permeable sheet, a composite film made by laminating a resin layer having a lower softening point than said plastic fiber constituting said air-permeable sheet and a resin layer having a higher softening point than said plastic fiber, and a porous resin film having a lower softening point than said plastic fiber, in which laminate the low softening point resin layer side of said composite film opposes said porous resin film with said air-permeable sheet interposed therebetween, said pair of laminates being joined together so that the low softening point resin sides of the respective laminates face each other.
Claim 22
Dependent Claim
12 words
A package according to claim 20 wherein said composite film is porous.
Claim 23
Dependent Claim
33 words
A package according to claim 21 wherein the size of openings of said porous composite film is 10 mm or less, and the number of openings is more than 100 openings/m 2 .
Claim 24
Dependent Claim
18 words
A package according to claim 21 wherein the porosity of said porous composite film is 1 to 30%.
Claim 25
Dependent Claim
17 words
A package according to claim 21 wherein said composite film is perforated by irradiated of laser beams.
Claim 26
Dependent Claim
56 words
A package according to claim 21 wherein the resin constituting the low softening point resin layer of said porous composite sheet is selected from the group consisting of polyethylene, polypropylene, ethylene-vinyl acetate copolymer, and ethyl acrylate-ethylene copolymer, and the resin constituting the high softening point resin layer of said composite sheet is nylon or polyethylene terephthalate.
Claim 27
Dependent Claim
17 words
A package according to claim 21 wherein the thickness of said composite film is 300μ or less.
Claim 28
Dependent Claim
56 words
A package according to claim 20 wherein the resin constituting the low softening point resin layer of said porous composite sheet is selected from the group consisting of polyethylene, polypropylene, ethylene-vinyl acetate copolymer, and ethyl acrylate-ethylene copolymer, and the resin constituting the high softening point resin layer of said composite sheet is nylon or polyethylene terephthalate.
Claim 29
Dependent Claim
18 words
A package according to claim 20 wherein the thickness of said composite film is 300 μ or less.
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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) | 1992-08-14 | 1993-02-13 | 1993-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-14 | 1997-02-13 | 1997-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-14 | 2001-02-13 | 2001-08-15 | $7700.00 | Window Closed / Lapsed |