Storage Tips for Book Printing Paper (1)

Thickness, tightness, smoothness, dustiness, moisture content, pH and effect on offset printing of printing paper.

1. Thickness. Refers to the thickness of the paper. The thickness of the paper should be uniform, otherwise the printing effect will be significantly different.

2. Tightness. Tightness refers to the looseness or tightness of the paper structure, also known as specific gravity or volume. Tightness is closely related to ink absorption and smoothness. Generally, the ink absorption of paper decreases with the increase of tightness, so paper with high tightness should use oxidative conjunctival drying ink.

3. Smoothness. Smoothness refers to the smoothness and smoothness of the surface of the paper. The smoothness determines the tightness of the contact between the paper and the blanket. Obviously, the clarity of images and texts printed on paper with poor smoothness will be affected.

4. Dust degree. Dustiness refers to the presence of black and non-black spots on the surface of the paper that are different from the paper color. In offset printing, the restrictions on dust are mainly determined according to the requirements of the printed matter. For example, when printing portraits and maps, large dust and black dust spots are not allowed.