US4746591A
Expired / Lapsed
US
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Process for producing presensitized lithographic printing plate with liquid honed aluminum support surface
Assignee: Fujifilm Holdings Corp
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Filing: 1986-09-04
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Granted: 1988-05-24
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Expires: 2006-09-04
Abstract
Abstract A process for preparing a lithographic support, and the printing plate made therefrom, are described, wherein the process comprises the steps of (a) liquid-honing a surface of an aluminum sheet, and (b) electrochemically graining the surface of the aluminum sheet in an electrolyte comprises hydrochloric acid, nitric acid, or a mixture thereof.
Inventors
- 👤 Hirokazu Sakaki
- 👤 Akira Shirai
- 👤 Akio Uesugi
- 👤 Tsutomu Kakei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:39
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/04; B41N3/03; B41N3/034; C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/06; C25D11/08; C25F; C25F3/00; C25F3/02; C25F3/04
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
117 words
A process for preparing a presensitized lithographic printing plate precursor which comprises the steps of: (a) liquid-honing a surface of an aluminum sheet by jetting a high-pressure liquid from at least one nozzle at a high flow rate, joining a slurry containing a fine powder of an abrasive with the jetted high-pressure liquid stream, and directing the resulting mixed stream to strike against a surface of the aluminum sheet; then (b) electrochemically graining the surface of the aluminum sheet in an electrolyte comprising hydrochloric acid, nitric acid, or a mixture thereof and thereafter (c) coating a layer of a light-sensitive composition comprising (1) a diazo resin and a binder or (2) an o-quinonediazide compound on said surface.
Claim 2
Dependent Claim
117 words
A process for preparing a presensitized lithographic printing plate precursor which comprises the steps of: (a) liquid-honing a surface of an aluminum sheet by jetting a high-pressure liquid from at least one nozzle at a high flow rate, joining a slurry containing a fine powder of an abrasive with the jetted high-pressure liquid stream, and directing the resulting mixed stream to strike against a surface of the aluminum sheet; then (b) electrochemically graining the surface of the aluminum sheet in an electrolyte comprising hydrochloric acid, nitric acid, or a mixture thereof and thereafter (c) coating a layer of a light-sensitive composition comprising (1) a diazo resin and a binder or (2) an o-quinonediazide compound on said surface.
Claim 3
Dependent Claim
31 words
A process of claim 1, wherein the process further includes the step of chemically etching the surface of the aluminum sheet after the step (a) but prior to the step (b).
Claim 4
Dependent Claim
27 words
A process of claim 2, wherein the process further includes the step of anodizing the aluminum sheet after the step (b) but prior to the step (c).
Claim 5
Dependent Claim
55 words
A process of claim 3, wherein the high-pressure liquid is jetted from at least one nozzle at a flow rate of from 30 to 140 m/second at a pressure of from 5 to 100 kg/cm 2 , and the slurry is spouted from a spout at a flow rate of from 2 to 25 m/second.
Claim 6
Dependent Claim
25 words
A process of claim 3, wherein the slurry contains a fine powder of an abrasive in an amount of from 5 to 80% by weight.
Claim 7
Dependent Claim
25 words
A process of claim 3, wherein the slurry contains a fine powder of an abrasive in an amount of from 30 to 50% by weight.
Claim 8
Dependent Claim
24 words
A process of claim 3, wherein the liquid honing is carried out to form an average center-line roughness of from 0.35 to 0.8 μm.
Claim 9
Dependent Claim
33 words
A process of claim 3, wherein the chemical etching is carried out by using an etching solution comprising an acid or an alkali to etch from 0.1 to 10 g/m 2 of aluminum.
Claim 10
Dependent Claim
19 words
A process of claim 3, wherein the process further includes desmutting the etching aluminum sheet after the chemical etching.
Claim 11
Dependent Claim
34 words
A process of claim 3, wherein the electrochemical graining is carried out to form a roughness having a pit depth of from 0.1 to 1μ and a pit diameter of from 0.1 to 5μ.
Claim 12
Dependent Claim
34 words
A process of claim 3, wherein the electrochemical graining is carried out to form a roughness having a pit depth of from 0.1 to 0.8μ and a pit diameter of from 0.1 to 3μ.
Claim 13
Dependent Claim
70 words
A process of claim 3, wherein the anodic oxidation is carried out in a 1 to 80 wt% aqueous solution of sulfuric acid, phosphoric acid or a mixture thereof, at a temperature of from 5° to 70° C., at a current density of from 0.5 to 60 amperes/dm 2 , at a voltage of from 1 to 100 v, and for a time period of from 10 to 100 seconds.
Claim 14
Dependent Claim
29 words
A process of claim 12, wherein the anodic oxidation is carried out to form an anodic oxidation film having a thickness of from 0.1 to 10 g/m 2 .
Claim 15
Dependent Claim
29 words
A process of claim 12, wherein the anodic oxidation is carried out to form an anodic oxidation film having a thickness of from 0.3 to 5 g/m 2 .
Claim 16
Dependent Claim
14 words
A process of claim 1, wherein the slurry contains an acid or an alkali.
Claim 17
Dependent Claim
25 words
A process of claim 1, wherein the liquid honing is carried out to form an average center-line roughness of from about 0.3 to 1.2 μm.
Claim 18
Dependent Claim
21 words
A process of claim 1, wherein said electrolyte comprises 0.1 to 10 wt% hydrochloric acid, nitric acid, or a mixture thereof.
Claim 19
Dependent Claim
27 words
A process of claim 1, wherein said mixed stream is allowed to strike against the aluminum surface at an angle of from about 15° to about 165°.
Claim 20
Dependent Claim
13 words
A presensitized lithographic printing plate precursor produced by the process of claim 1.
Claim 21
Dependent Claim
13 words
A presensitized lithographic printing plate precursor produced by the process of claim 2.
Claim 22
Dependent Claim
13 words
A presensitized lithographic printing plate precursor produced by the process of claim 3.
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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) | 1991-05-24 | 1991-11-23 | 1992-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-24 | 1995-11-23 | 1996-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-24 | 1999-11-23 | 2000-05-24 | $7700.00 | Window Closed / Lapsed |