摘要:
In a process for producing an aluminum support of a lithographic printing plate, the desired aluminum support is produced by imparting fine asperities to an aluminum plate and then roughening it electrochemically in an acidic aqueous solution. The roughened aluminum plate may be electropolished or chemically etched.
摘要:
A process for producing an aluminum support for a planographic printing plate, the process comprising the steps of: (a) preparing an aluminum plate; (b) disposing said aluminum plate in an aqueous acidic solution; and (c) electrochemically surface-roughening said aluminum plate using an alternating current, wherein a ratio QC/QA of a cathode-time quantity of electricity of said aluminum plate QC to an anode-time quantity of electricity of said aluminum plate QA is from 0.95 to 2.5. An aluminum support for a planographic printing plate formed by the process. A planographic printing master plate comprising at least a positive-type or negative-type light-sensitive layer on the aluminum support.
摘要:
Disclosed is a production method of an aluminum support for a lithographic printing plate, capable of stable and low-cost production of an aluminum support for a lithographic printing plate, the support being scarcely subject to generation of treatment unevenness called streaks or grainy unevenness ascribable to the different in the aluminum dissolving rate due to the difference in the orientation of the crystal grain. The aluminum support is produced by surface graining and then polishing an aluminum plate or by polishing an aluminum plate while etching it in an aqueous acid or alkali solution. The aluminum plate may be subjected to polishing and then to anodization or may be subjected to polishing, to surface graining, again to or not to polishing and then to anodization. A production method for producing a high-quality support for a lithographic printing plate, free of local unevenness is also disclosed.
摘要:
The invention provides a method for producing a support for planographic printing plates which comprises a step of roughening the surface of an aluminum plate and in which the surface-roughening step includes (1) a pre-electrolytic surface-roughening step of electrolytically roughening the surface of an aluminum plate in an aqueous hydrochloric acid solution, (2) an alkali-etching step of etching the roughened surface of the aluminum plate with an alkali solution, (3) a desmutting step of contacting the etched aluminum plate with an aqueous sulfuric solution having predetermined sulfuric acid and aluminum ion concentrations at a predetermined temperature for 1 to 180 seconds, and (4) an electrolytic surface-roughening step of processing the desmutted aluminum plate in an aqueous nitric acid solution with an alternating current being applied thereto. The invention enables stable and inexpensive production of planographic printing plate supports even from regenerated aluminum.
摘要:
In a process for producing an aluminum support of a lithographic printing plate, the desired aluminum support is produced by imparting fine asperities to an aluminum plate and then roughening it electrochemically in an acidic aqueous solution. The roughened aluminum plate may be electropolished or chemically etched.
摘要:
A method for producing an aluminum support for a lithographic printing plate comprising the steps of (a) electrolytic polishing an aluminum plate in an alkaline aqueous solution; and (b) electrochemically surface roughening the aluminum plate using direct or alternating current in an acidic aqueous solution in this order, and also a method for producing an aluminum support for a lithographic printing plate comprising an electrolytic polishing step of treating an aluminum plate used as an anode in an alkaline aqueous solution at a current density of 5 A/dm.sup.2 to 200 A/dm.sup.2 while allowing the alkaline aqueous solution to flow between the aluminum plate and an electrode at an average flow rate of 10 cm/second to 400 cm/second.
摘要:
Disclosed is a presensitized plate, having an anodized layer and recording layer provided on a support for a lithographic printing plate, wherein the anodized layer is provided by subjecting an aluminum plate to graining and anodizing treatments. The presensitized plate has wide development latitude, makes it difficult for scratch-like non-image portions to be generated and facilitates handling in usual operation.
摘要:
Disclosed are a method for producing an aluminum support for lithographic printing plates, comprising subjecting an aluminum plate in sequence to (1) a surface roughening treatment, (2) a heat treatment, (3) a treatment of dissolving from 0.01 to 5 g/m2 of said aluminum plate, and then (4) an anodization treatment; a method for producing an aluminum support for lithographic printing plates, comprising subjecting an aluminum plate to an electrochemical surface roughening treatment both before and after an electrolytic treatment in an aqueous neutral salt solution using the aluminum plate as a cathode.
摘要:
Disclosed is a light-transmitting electromagnetic-shielding laminate, which is characterized in that two or more layers including an electromagnetic-shielding layer are arranged in layers using a (meth)acrylate adhesive composition which contains a (meth)acrylate monomer, a (meth)acrylate oligomer and at least one member selected from the group consisting of acrylic amide derivatives, silane compounds and organophosphorus compounds. Also disclosed is a light-transmitting radio wave absorber which is characterized in that a resistive layer, a dielectric spacer and a reflective layer are arranged in layers using a (meth)acrylate adhesive composition which contains a (meth)acrylate monomer, a (meth)acrylate oligomer and at least one member selected from the group consisting of acrylic amide derivatives, silane compounds and organophosphorus compounds.