US4257843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the production of a matted transparent paper and the product thereof
Assignee: New Oji Paper Co Ltd
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Filing: 1978-11-06
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Granted: 1981-03-24
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Expires: 1998-11-06
Abstract
Abstract A matted transparent paper is obtained by moistening a paper prepared from relatively lightly beaten pulp and then subjecting the moistened paper to a calendering treatment with the use of a heated embossing metal roll having a finely engraved surface with sharp reliefs.
Inventors
- 👤 Noritoshi Watanabe
- 👤 Masato Nakamura
- 👤 Seigoro Fujita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:45
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/10; B41M1/00; B41M1/26; B41M1/36; D; D21; D21F; D21F11/00; D21F11/006; D21H; D21H25/00; D21H25/005
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
139 words
A matted transparent paper manufactured by the steps of preparing a paper from an aqueous suspension of pulp having a CSF larger than 100 cc, moistening said paper so as to have a moisture content within the range of 5 to 30%, and calendering said moistened paper with the use of a heated embossing metal roll having a surface temperature of 50° to 200° C. to transparentize said moistened paper and form a finely embossed surface thereon, said embossing metal roll having a peripheral surface engraved so as to have a surface roughness of a Rmax of 25 to 160 microns and a relief peak number of 1 to 20 per 1 mm, and said pulp consisting essentially of wood pulp or a mixture of wood and synthetic pulp, at least 10% by-weight of the mixture being wood pulp.
Claim 2
Dependent Claim
139 words
A matted transparent paper manufactured by the steps of preparing a paper from an aqueous suspension of pulp having a CSF larger than 100 cc, moistening said paper so as to have a moisture content within the range of 5 to 30%, and calendering said moistened paper with the use of a heated embossing metal roll having a surface temperature of 50° to 200° C. to transparentize said moistened paper and form a finely embossed surface thereon, said embossing metal roll having a peripheral surface engraved so as to have a surface roughness of a Rmax of 25 to 160 microns and a relief peak number of 1 to 20 per 1 mm, and said pulp consisting essentially of wood pulp or a mixture of wood and synthetic pulp, at least 10% by-weight of the mixture being wood pulp.
Claim 3
Dependent Claim
23 words
A matted transparent paper as defined in claim 1, wherein said pulp has a CSF within the range of 150 to 650 cc.
Claim 4
Dependent Claim
23 words
A matted transparent paper as defined in claim 2, wherein said pulp has a CSF within the range of 200 to 600 cc.
Claim 5
Dependent Claim
28 words
A matted transparent paper as defined in claim 1, wherein said paper is moistened so as to have a moisture content within the range of 7 to 27%.
Claim 6
Dependent Claim
25 words
A matted transparent paper as defined in claim 1, wherein said relief peak number is within the range of 2 to 15 per 1 mm.
Claim 7
Dependent Claim
25 words
A matted transparent paper as defined in claim 1, wherein said moistened paper is calendered under pressure within the range of 20 to 600 kg/cm.
Claim 8
Dependent Claim
25 words
A matted transparent paper as defined in claim 6, wherein said moistened paper is calendered under pressure within the range of 40 to 400 kg/cm.
Claim 9
Dependent Claim
27 words
A matted transparent paper as defined in claim 1, wherein the surface temperature of said embossing metal roll is within the range of 80° to 180° C.
References Cited (Backward Citations)
US1992996A
Cited
US3235443A
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US3486970A
Cited
US3412479A
Cited
US3674621A
Cited
US3892887A
Cited
US4015043A
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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) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |