Substrates for presensitized plates for use in making lithographic printing plates
First Claim
1. A substrate for presensitized plates for use in making lithographic printing plates comprising an aluminum plate provided thereon with a porous anodized film, wherein the degree of sealing of the anodized film is not less than 25%, and the amount of the porous anodized film is 0.8g/m2 or more.
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Accused Products
Abstract
A substrate for presensitized plates for use in making lithographic printing plates which comprises an alumium plate provided thereon with a porous anodized film, the degree of sealing of the anodized film being not less than 25%. The substrate can impart various excellent properties to the lithographic printing plate as a final product. That is, the plate sparingly causes contamination of the non-image portions thereof; has high resistance to scratching; and is excellent in wear resistance, recovery from contamination with ink and printing durability due to improvement in the properties of the anodized film.
24 Citations
18 Claims
- 1. A substrate for presensitized plates for use in making lithographic printing plates comprising an aluminum plate provided thereon with a porous anodized film, wherein the degree of sealing of the anodized film is not less than 25%, and the amount of the porous anodized film is 0.8g/m2 or more.
Specification