Printing plates
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United States of America Patent
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Oct 13, 1981
Issued Date -
N/A
app pub date -
Aug 11, 1980
filing date -
Jul 8, 1974
priority date (Note) -
Expired
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Abstract
A method of treating a plate comprising a substrate carrying an image includes the step of providing a shield on the plate prior to heating the plate so as to prevent contaminants contacting the plate during the heating step. The plate may be a radiation sensitive plate which has been image-wise exposed and developed and which comprises a substrate coated with a radiation sensitive layer comprising for example a quinone diazide and a novolak resin. The radiation sensitive plate may be for the production of a lithographic printing plate and the shield may be in the form of, for example, a layer of a salt such as sodium dedecyl phenoxy benzene disulphonate.
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