PRINTING METHOD BY OFFSET PRINTING PRESS AND OFFSET PRINTING PRESS
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United States of America Patent
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Issued Date -
Nov 18, 2010
app pub date -
Jun 11, 2008
filing date -
Jun 11, 2007
priority date (Note) -
Abandoned
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Abstract
The invention relates to a printing method by an offset printing press and an offset printing press by which a substrate process is carried out for low-whiteness printing paper such as paper for newspaper with aqueous substrate treatment agent so that the print quality can be improved. In the invention, in order to suppress occurrence of a curl of printing paper, substrate treatment agent containing solid fine particles and a binder component is supplied to a printing face of printing paper, and the substrate treatment agent is dried to form a porous layer having a great number of holes having a smaller diameter than that of pigment contained in printing ink from the solid fine particles and the binder resin. Then, offset printing is carried out on the printing paper.
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