Process for preparing improved lithographic printing plates

Details Process for preparing improved lithographic printing plates Process for preparing improved lithographic printing plates

B - Operations, Transporting

41

N

B41N 3/04 (2006.01)

Patent

CA 2171555

Provides herein is a brushgraining process to improve the quality of lithographic printing plate substrate surfaces. In the process, the surface is brushed in an aqueous slurry comprising a mixture of particulates of alumina and quartz in a weight ratio range 95:5 to 5:95, with the particulates being in the size range of 1-20 microns. Such a process surprisingly lessens the number of scratches produced on the substrate surface than when compared to using alumina alone or quartz alone or a mixture of alumina and quartz with particle sizes higher than the range disclosed.

L'invention décrit un procédé de grainage à la brosse qui améliore la qualité des surfaces de substrat de plaques d'impression lithographiques. Dans ce procédé, la surface est brossée dans une émulsion aqueuse comprenant un mélange de particules d'alumine et de quartz d'une taille de 1 à 20 microns, dans une plage de rapports de poids de 95/5 à 5/95. Ce procédé réduit de manière surprenante le nombre d'éraflures produites sur la surface de substrat par rapport à l'utilisation d'alumine seule ou de quartz seul, ou encore d'un mélange d'alumine et de quartz avec des particules dont la taille dépasse la plage décrite.

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