Patent US4657610A successfully refreshed from Google Patents.
US4657610A
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US
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Method for manufacturing gas permeable packaging material
Assignee: MITSUSBISHI GAS CHEMICAL COMPANY Inc
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Filing: 1986-03-05
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Granted: 1987-04-14
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Expires: 2006-03-05
Abstract
Abstract A method of manufacturing a gas permeable packaging material, which comprises the steps of forming a laminate composed of an outer plastic film and a gas permeable inner sheet with a first heat-sealable layer interposed therebetween, perforating the laminate with a number of micro-pores, which extend from the outer film side to at least the inner sheet, heat-sealing a second heat-sealable film with or without a number of small-pores to the inner sheet, and, if the second heat-sealable film is of no porous, forming a number of small-pores in the second heat-sealable film, a pore ratio of the second heat-sealable film being greater than that of the outer film.
Inventors
- 👤 Toshio Komatsu
- 👤 Hideyuki Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:59
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/10; B32B3/00; B32B3/26; B32B38/00; B32B38/0036; B32B38/004; B65; B65D; B65D75/00; B65D75/26; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/70; B32B2307/724; B32B2553/00; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1056; Y10T156/1057; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24322; Y10T428/24942; Y10T428/2495; Y10T428/249921; Y10T428/249953; Y10T428/249981
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
108 words
A method of manufacturing a gas permeable packaging material, comprising the steps of: forming a laminate by heating an outer plastic film and a gas permeable inner sheet, with a first heat-sealable layer interposed between the film and sheet; forming a large number of small-pores in the laminate, extending from the outer film to at least the inner sheet; and placing, on the inner sheet of the laminate, a second heat-sealable film having a number of small-pores and a pore ratio greater than that of the outer plastic film, and heating the second heat-sealable film, thereby adhering the second heat-sealable film to the inner sheet of the laminate.
Claim 2
Independent Claim
108 words
A method of manufacturing a gas permeable packaging material, comprising the steps of: forming a laminate by heating an outer plastic film and a gas permeable inner sheet, with a first heat-sealable layer interposed between the film and sheet; forming a large number of small-pores in the laminate, extending from the outer film to at least the inner sheet; and placing, on the inner sheet of the laminate, a second heat-sealable film having a number of small-pores and a pore ratio greater than that of the outer plastic film, and heating the second heat-sealable film, thereby adhering the second heat-sealable film to the inner sheet of the laminate.
Claim 3
Independent Claim
132 words
A method of manufacturing a gas permeable packaging material, comprising the steps of: forming a laminate by heating an outer plastic film and a gas permeable inner sheet, with a first heat-sealable layer interposed between the film and sheet; forming a large number of small-pores in the laminate, extending from the outer film to at least the inner sheet; placing, on the inner sheet of the laminate, a second heat-sealable film and heating the same, thereby adhering the second heat-sealable film to the inner sheet of the laminate; and forming a number of small-pores in the laminate from the second heat-sealable film, extending through at least the second heat-sealable film but not through the outer film, a pore ratio of the second heat-sealable film being greater than that of the outer film.
Claim 4
Independent Claim
132 words
A method of manufacturing a gas permeable packaging material, comprising the steps of: forming a laminate by heating an outer plastic film and a gas permeable inner sheet, with a first heat-sealable layer interposed between the film and sheet; forming a large number of small-pores in the laminate, extending from the outer film to at least the inner sheet; placing, on the inner sheet of the laminate, a second heat-sealable film and heating the same, thereby adhering the second heat-sealable film to the inner sheet of the laminate; and forming a number of small-pores in the laminate from the second heat-sealable film, extending through at least the second heat-sealable film but not through the outer film, a pore ratio of the second heat-sealable film being greater than that of the outer film.
Claim 5
Dependent Claim
19 words
The method according to claim 1, wherein the thickness of the outer film is not more than 50 microns.
Claim 6
Dependent Claim
16 words
The method according to claim 1, wherein said heat-sealable films are made of a thermoplastic material.
Claim 7
Dependent Claim
35 words
The method according to claim 1, wherein said heat-sealable films are formed by coating a heat sealable coating agent on the gas permeable inner sheet in an amount of 0.5 to 30 g/m 2 .
Claim 8
Dependent Claim
19 words
The method according to claim 1, wherein said gas permeable inner sheet is made of paper or nonwoven fabric.
Claim 9
Dependent Claim
23 words
The method according to claim 6, wherein said paper or nonwoven fabric has a basis weight of 15 to 100 g/m 2 .
Claim 10
Dependent Claim
17 words
The method according to claim 1, wherein said laminate is formed by adhering three layers by heat-pressing.
Claim 11
Dependent Claim
40 words
The method according to claim 1, wherein said laminate is formed by pouring a molten heat sealable coating agent into the gap between said outer film and said gas permeable inner sheet and then cooling the heat sealable coating agent.
Claim 12
Dependent Claim
18 words
The method according to claim 2, wherein said second heat-sealable film is laminated with said laminate by heat-pressing.
Claim 13
Dependent Claim
35 words
The method according to claim 1, wherein said second heat-sealable film has a pore ratio of 0.2 to 30%, the pore ratio of said second heat-sealable film being greater than that of said outer film.
Claim 14
Dependent Claim
19 words
The method according to claim 2, wherein the thickness of the center film is not more than 50 microns.
Claim 15
Dependent Claim
16 words
The method according to claim 2, wherein said heat-sealable films are made of a thermoplastic material.
Claim 16
Dependent Claim
35 words
The method according to claim 2, wherein said heat-sealable films are formed by coating a heat sealable coating agent on the gas permeable inner sheet in an amount of 0.5 to 30 g/m 2 .
Claim 17
Dependent Claim
19 words
The method according to claim 2, wherein said gas permeable inner sheet is made of paper or non-woven fabric.
Claim 18
Dependent Claim
23 words
The method according to claim 15, wherein said paper or nonwoven fabric has a basis weight of 15 to 100 g/m 2 .
Claim 19
Dependent Claim
17 words
The method according to claim 2, wherein said laminate is formed by adhering three layers by heat-pressing.
Claim 20
Dependent Claim
40 words
The method according to claim 2, wherein said laminate is formed by pouring a molten heat sealable coating agent into the gap between said outer film and said gas permeable inner sheet and then cooling the heat sealable coating agent.
Claim 21
Dependent Claim
35 words
The method according to claim 2, wherein said second heat-sealable film has a pore ratio of 0.2 to 30%, the pore ratio of said second heat-sealable film being greater than that of said outer film.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-04-13 | 1990-10-13 | 1991-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-13 | 1994-10-13 | 1995-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-13 | 1998-10-13 | 1999-04-14 | $7700.00 | Window Closed / Lapsed |