Method for making lithographic printing plate

Details Method for making lithographic printing plate Method for making lithographic printing plate

Filed on

2005-01-25

Date issued

2005-01-25

Examiner

Gilliam, Barbara L. (Department: 1752)

Patent Class

Radiation imagery chemistry: process, composition, or product th

SubClass

Imaging affecting physical property of radiation sensitive...

SubSubClass

Making printing plates

Other Related Categories

C430S281100, C430S286100, C430S309000, C430S401000, C430S434000, C430S494000, C430S945000, C101S463100

Type

Reexamination Certificate

Status

active

Patent number

06846615

Description

ABSTRACT:
The present invention provides a method for making a lithographic printing plate, which comprises imagewise exposing a presensitized plate having a photopolymerizable layer on a substrate having a hydrophilic surface by scanning the plate with laser light having a wavelength of 450 nm or shorter, developing the exposed plate with a developer and further exposing the whole surface of the developed plate to light having a wavelength of 450 nm or shorter. The method provides a lithographic printing plate by which a fog of reflection that is easily occurred in an inner drum-type exposing device during a direct process can be reduced to provide a clear image as well as a high printing durability.

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