US4680250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite aluminum sheet for presensitized lithographic printing plate comprising a support having specified center line average roughness
Assignee: Nippon Foil Manufacturing Co Ltd
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Filing: 1985-11-25
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Granted: 1987-07-14
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Expires: 2005-11-25
Abstract
Abstract A composite aluminum sheet for a presensitized lithographic printing plate comprises a support such as a thermoplastic sheet and an aluminum foil which has a matt surface with a roughness of 0.20-0.65 μm R a on one side thereof and is prepared by twice or more repeatedly pack rolling doubled aluminum foils, the support being overlaid with the aluminum foil so that the matt surface thereof faces outside. A presensitized plate for lithography having excellent printing properties such as printing runnability can be prepared from the composite aluminum sheet.
Inventors
- 👤 Hironori Kitamura
- 👤 Kanji Noma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:42
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/04; B21; B21B; B21B1/00; B21B1/40; B41N1/00; B41N1/04; B41N1/08; B41N1/086; B41N1/10; B21B1/38; B21B3/00; B21B2003/001; B21B45/00; B21B45/02; B21B45/0239; B21B45/0245; B21B45/0248; B21B45/0251; Y; Y10; Y10S; Y10S430/00; Y10S430/162
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
107 words
A composite sheet for a presensitized lithographic printing plate, comprising a support of a synthetic resin film and an aluminum foil thereon, said aluminum foil having a matt surface with a roughness of 0.20 to 0.65 μmR a on one surface thereof and a thickness of from 7 to 80 μm, said foil prepared by twice or more pack rolling doubled aluminum foils under the conditions of a roll load of 100 to 250 kg/mm, a rolling speed of 100 to 800 m/min and a reduction per pass of 20 to 65%, said aluminum foil positioned on said support so that the matt surface thereof faces outside.
Claim 2
Dependent Claim
107 words
A composite sheet for a presensitized lithographic printing plate, comprising a support of a synthetic resin film and an aluminum foil thereon, said aluminum foil having a matt surface with a roughness of 0.20 to 0.65 μmR a on one surface thereof and a thickness of from 7 to 80 μm, said foil prepared by twice or more pack rolling doubled aluminum foils under the conditions of a roll load of 100 to 250 kg/mm, a rolling speed of 100 to 800 m/min and a reduction per pass of 20 to 65%, said aluminum foil positioned on said support so that the matt surface thereof faces outside.
Claim 3
Independent Claim
99 words
A method for producing a composite sheet for a presensitized lithographic printing plate, comprising subjecting doubled aluminum foils to the pack rolling process twice or more under the conditions of a roll load of 100 to 250 kg/mm, a rolling speed of 100 to 800 m/min and a reduction per pass of 20 to 65% to obtain an aluminum foil with a matt surface with a roughness of 0.20 to 0.65 μmR a on one surface thereof and a thickness of from 7 to 80 μm, and adhering said aluminum foil to a support of a synthetic resin film.
Claim 4
Independent Claim
99 words
A method for producing a composite sheet for a presensitized lithographic printing plate, comprising subjecting doubled aluminum foils to the pack rolling process twice or more under the conditions of a roll load of 100 to 250 kg/mm, a rolling speed of 100 to 800 m/min and a reduction per pass of 20 to 65% to obtain an aluminum foil with a matt surface with a roughness of 0.20 to 0.65 μmR a on one surface thereof and a thickness of from 7 to 80 μm, and adhering said aluminum foil to a support of a synthetic resin film.
Claim 5
Dependent Claim
23 words
The composite sheet of claim 1, in which the synthetic resin film is a sheet of polyethylene terephthalate, oriented polypropylene, polypropylene or polyethylene.
Claim 6
Dependent Claim
21 words
The composite sheet of claim 1 or 3, further comprising a metal reinforcing layer on the other side of the support.
Claim 7
Dependent Claim
22 words
The composite sheet of claim 4, in which the metal reinforcing layer is an aluminum foil having a thickness of 10-40 μm.
Claim 8
Dependent Claim
89 words
The composite sheet of claim 1 or claim 2 further comprising another aluminum foil which has a matt surface with a roughness of 0.20-0.65 μmR a on one side thereof and is prepared by twice or more pack rolling doubled aluminum foils under the conditions of a roll load 100 to 250 kg/mm, a rolling speed of 100 to 800 m/min and a reduction per pass of 20 to 65%, the support being interposed between two aluminum foils so that each matt surface of the aluminum foils faces outward.
Claim 9
Dependent Claim
35 words
A lithographic printing plate comprising a composite sheet of claims 1, 3, 4, 5 or 6, an anodized layer on the matt surface of the aluminum foil and a photosensitive coating on the anodized layer.
Claim 10
Dependent Claim
20 words
The lithographic printing plate of claim 7, further comprising a hygroscopic layer between the anodized layer and the photosensitive coating.
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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) | 1990-07-13 | 1991-01-12 | 1991-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-13 | 1995-01-12 | 1995-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-13 | 1999-01-12 | 1999-07-14 | $7700.00 | Window Closed / Lapsed |