Alcohol-free printing dampening liquid for multilayer metal plate printing for water offset printing

Abstract

The invention relates to application of alcohol-free dampening liquid in multilayer metal plate alcohol-free printing of water offset printing. The volume proportion of the alcohol-free dampening liquid to water for diluting is 2-5.5 percent to 98-94.5 percent. The alcohol-free dampening liquid consists of the following components in portion by weight: 80 portions of water, 10 portions of Arabic gum, 7 portions of magnesium nitrate, 1.4 portions of 85 volume percent phosphoric acid, 1.2 portions of sodium hydrogen phosphate, 1.2 portions of methyl carbitol, 1.0 portion of ethyl carbitol, and 0.2 portion of copolymer of ethylene oxide, propylene epoxide and glycerol. The surface tension of the provided alcohol-free dampening liquid during use is minimum, and the minimum surface tension is the key of the dampening liquid to prevent ink from permeating a pattern-free area. The alcohol-free dampening liquid adopted for replacing the prior dampening liquid has positive significance for reducing the discharge of VOC, lowering the production cost and protecting the environment.

Description

technical field [0001] The invention relates to the application of an alcohol-free fountain solution in alcohol-free printing, in particular to the application of an alcohol-free fountain solution in alcohol-free printing of multilayer metal plates for water offset printing. And concerns the alcohol-free fountain solution applied. Background technique [0002] The function of the fountain solution is to prevent the penetration of ink into the non-patterned areas. Alcohol-free fountain solution means that the fountain solution does not contain alcohol or isopropanol. [0003] Alcohol-free printing is a trend because of its environmental protection. Alcohol-free printing has been used in many printing fields. [0004] However, there has always been a prejudice that alcohol-free printing cannot be used in the field of multilayer metal plates. This is because: at this stage, domestic and foreign water offset printing mostly use PS plates, and multi-layer metal plates are only...

AI Technical Summary

Problems solved by technology

The imprint of the ink layer of the multi-layer metal plate is thicker than that of other offset printing plates. It is very difficult to realize alcohol-free printing. It is relatively easy to use PS plates for alcohol-free printing. The fountain solution of traditional multi-layer metal plate printing It is inseparable from alcohol or isopropanol, which brings great difficulty to water offset multi-layer metal plate alcohol-free printing

The main prejudice of water offset multilayer metal plate is that the ink layer is too thick and the ink fluidity is poor. Only the fountain solution using alcohol or isopropanol as diluent can better prevent the ink from penetrating into the non-patterned area.