US4956209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-fogging multilayered film and bag produced therefrom for packaging vegetables and fruits
Assignee: Toyobo Co Ltd
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Filing: 1989-03-21
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Granted: 1990-09-11
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Expires: 2009-03-21
Abstract
Abstract An anti-fogging multilayered film suitable for packaging fresh vegetables and fruits comprising a base layer and at least one surface layer containing an anti-fogging agent, said film having a water vapor transmission of 15 to 200 g/m 2 ·24 hr·40° C., an oxygen permeability of 3,000 to 35,000 cc/m 2 ·24 hr·atm·20° C.·90% RH, and a carbon dioxide permeability of 12,000 to 130,000 cc/m 2 ·24hr·atm·20° C.·90% RH, and said anti-fogging surface layer having heat sealing properties. A packaging bag produced from this film is also disclosed.
Inventors
- 👤 Tsutomu Isaka
- 👤 Saburo Ohta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:53
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/18; B32B2307/00; B32B2307/30; B32B2307/31; B32B2439/00; B32B2439/40; B32B2439/70; B32B2553/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/1341; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31935; Y10T428/31938
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
197 words
A bag for packaging vegetables and fruits, comprising front and rear walls formed of a biaxially oriented multi-layer anti-fogging film, the film comprising a base layer and at least one surface layer containing an anti-fogging agent, at least three peripheral sides of the front wall being connected to corresponding peripheral sides of the rear wall in such a manner that an anit-fogging heat sealable surface layer of the front wall faces an anti-fogging heat sealable surface layer of the rear wall, the film having a water vapor transmission of 15 to 200 g/m 2 -24 hr-40° C., an oxygen permeability of 3,000 to 35,000 cc/m 2 -24 hr-atm-20° C.-90% RH, and a carbon dioxide permeability of 12,000 to 130,000 cc/m 2 -24 hr-atm 20° C.-90% RH, the anti-fogging surface layer having heat sealing properties such that the film shows a side welding seal strength of at least 3.0 kg-cm/15 mm when side welding is carried out at 270° C., and at least one surface of said film showing an anti-fogging property when exposed to two cycles of temperature rise and drop between 20° C. and 40° C., the temperature rises and drops occurring at 6 hour intervals.
Claim 2
Dependent Claim
197 words
A bag for packaging vegetables and fruits, comprising front and rear walls formed of a biaxially oriented multi-layer anti-fogging film, the film comprising a base layer and at least one surface layer containing an anti-fogging agent, at least three peripheral sides of the front wall being connected to corresponding peripheral sides of the rear wall in such a manner that an anit-fogging heat sealable surface layer of the front wall faces an anti-fogging heat sealable surface layer of the rear wall, the film having a water vapor transmission of 15 to 200 g/m 2 -24 hr-40° C., an oxygen permeability of 3,000 to 35,000 cc/m 2 -24 hr-atm-20° C.-90% RH, and a carbon dioxide permeability of 12,000 to 130,000 cc/m 2 -24 hr-atm 20° C.-90% RH, the anti-fogging surface layer having heat sealing properties such that the film shows a side welding seal strength of at least 3.0 kg-cm/15 mm when side welding is carried out at 270° C., and at least one surface of said film showing an anti-fogging property when exposed to two cycles of temperature rise and drop between 20° C. and 40° C., the temperature rises and drops occurring at 6 hour intervals.
Claim 3
Dependent Claim
46 words
A bag as claimed in claim 1, wherein at least one surface layer of the film shows an anti-fogging property when exposed to two cycles of temperature rise and drop between 0° C. and 40° C., the temperature rises and drops occurring at 6 hour intervals.
Claim 4
Dependent Claim
29 words
A bag according to claim 1, wherein the anti-fogging agent is contained in an amount of 0.3 to 3% by weight based on the total weight of the film.
Claim 5
Dependent Claim
26 words
A bag according to claim 1, wherein the anti-fogging agent is contained at least one surface layer in an amount of 0.3 to 3% by weight.
Claim 6
Dependent Claim
60 words
A bag according to claim 1, wherein the bag has at least one perforation provided on a part of or the entire surface of the walls, the total aperture area of which corresponds to 0.02 to 3.5% of the total surface area of the bag and is suitable for packaging vegetables and fruits which maintain vigorous physiological activities after harvesting.
Claim 7
Dependent Claim
62 words
A bag according to claim 1, wherein the bag has at least one cutout of 4 to 100 mm in length provided on its bottom side in such a manner that, not less than 50% of the length of the bottom side remains as a sealed are and is suitable for packaging vegetables and fruits which maintain vigorous physiological activities after harvesting.
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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) | 1993-09-10 | 1994-03-12 | 1994-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-10 | 1998-03-12 | 1998-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-10 | 2002-03-12 | 2002-09-11 | $7700.00 | Window Closed / Lapsed |