Storage Tips for Book Printing Paper (1)

2022-01-19

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.


5. Moisture content (degree). Moisture content refers to the moisture content of a certain weight of paper that is in equilibrium with the relative humidity of the environment at room temperature, also known as moisture content, or moisture for short. Generally, the moisture content of offset printing paper is 6% to 8%. If the water content of the paper is too high, the tensile strength and surface strength will be reduced, the plasticity will be enhanced, and the curing of the ink film at the printing speed will be delayed, which will form tight edges, ruffles, curls or unevenness, and wrinkles and pleats will be produced during printing.
6. pH. pH refers to the property of paper (in terms of pH) that is acidic or alkaline. The pH of the paper is an important factor that inhibits or accelerates the drying of the ink or affects the pH value of the dampening fluid, and also affects the durability of the print (ink fading).
We use cookies to offer you a better browsing experience, analyze site traffic and personalize content. By using this site, you agree to our use of cookies. Privacy Policy