B - Operations – Transporting – 41 – N
Patent
B - Operations, Transporting
41
N
B41N 3/06 (2006.01) B41C 1/05 (2006.01) B41C 1/10 (2006.01) B41M 5/24 (2006.01)
Patent
CA 2216060
Cleaning compositions for ablation-type lithographic printing plates include solvent, non-solvent and lubricating components, the vapor pressures and concentrations of the various components being chosen such that the mixture never becomes too rich in solvent. In this way, the solvent's effect is directed primarily at thermal byproducts, which, because they are exposed and already partly decomposed, are more vulnerable to solvent action that the intact, anchored plate constituents in unimaged regions. The compositions are used in conjunction with mechanical rubbing of the plate surface following imaging.
Des compositions de nettoyage pour planches d'impression off-set de type ablation comprennent des constituants (solvant, non solvant et lubrifiant) dont les tensions de vapeur et les concentrations sont choisies de manière que le mélange ne devienne jamais trop riche en solvant. De cette façon, l'effet du solvant est dirigé principalement sur les sous-produits thermiques, qui, du fait qu'ils sont exposés et déjà en partie décomposés, sont plus sensibles à l'action du solvant que les constituants intacts ancrés des planches dans les régions sans image. Les compositions sont utilisées en conjonction avec un dispositif d'essuyage mécanique de la surface de la planche après formation d'image.
Lanphear Susan J.
Lewis Thomas E.
Presstek Inc.
Smart & Biggar
LandOfFree
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