The Effect of Paper Moisture on Printing

The definition of paper moisture (moisture content) is the ratio of the reduced mass of the paper when dried to constant weight at a temperature of 100 to 150 ° C to the original mass of the sample, expressed as a percentage (%).


Relative humidity: The ratio of the amount of water vapor in a unit volume of air (absolute humidity) to the amount of water vapor in the same volume of saturated water vapor at the same temperature, expressed as a percentage (%).

1. Hygroscopicity and dimensional stability of paper: After absorbing water, the lateral size change of the paper is 3 times as large as the longitudinal size.

"Ruffles, tight edges, and curls" phenomenon:

Ruffle edge: the water content around is higher than that in the middle;


Tight edge: the water content around is lower than that in the middle;


Curling: The water content on both sides of the paper is inconsistent.

3. Impact on other properties: With an increase in water content, the absorption, tensile strength, tear resistance, folding resistance, surface strength, and elasticity of the paper will all decrease, and it is prone to wrinkles.

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