Planographic printing edition, the production manner and planographic printing edition basic plate

摘要

PROBLEM TO BE SOLVED: To increase the controllable range of a dampening water and to make the dampening water free from isopropanol(IPA) by specifying the range of the swelling rate with water of a nonpicture part comprising a hydrophilic swellable layer and controlling the swelling rate with water in a picture part lower than the swelling rate with water of a nonpicture part. ;SOLUTION: The swelling rate with water in a nonpicture part (an ink- repelling part) comprising a hydrophilic swellable layer is controlled to 10 to 2000% considering the ink repelling property and shape-holding property. It is more preferable that the rate is 50 to 1700%, and further more preferable when the rate is 50 to 700%. If the swelling rate is too small, the ink repelling property decreases in the nonpicture part, and if the swelling rate in the nonpicture part is too high, the shape holding property of the nonpicture part decreases. This causes damages in the nonpicture part during printing. It is necessary that the swelling rate in the picture part is lower than the swelling rate of the nonpicture part in order to form an image, however, the swelling rate is preferably controlled to 50%, more preferably to 30% in the nonpicture part to further advantageously form an image.;COPYRIGHT: (C)1997,JPO