In the packaging industry, the quality of paper directly affects the printing effect.

Today, Sinst Printing And Packaging tells you that in the packaging industry, the quality of paper directly affects the printing effect.


1、 Whiteness of paper

The whiteness of paper refers to its ability to fully reflect incident light, expressed as a percentage (reflectivity). Because ink is transparent, paper with higher whiteness can better highlight the true color effect of the ink. According to industry standards, the whiteness of offset coated paper should not be less than 85%.


2、 Smoothness of paper

The smoothness of paper refers to the degree to which the surface of the paper is flat and smooth. The smoothness of paper can be tested using a friction decolorization tester. The higher the smoothness of the paper, the better the color rendering. The ink is not easy to leak, and the glossiness of the ink when it dries into a thick film is better. Usually, the smoothness of coated paper is higher than that of offset paper, and the smoothness of offset paper is higher than that of newsprint.

3、 Glossiness and absorbency of paper


The glossiness of paper refers to the degree of specular reflection on the surface of the paper. The higher the glossiness of the paper surface, the less likely the color printed by Chongqing Printing Factory to undergo diffuse reflection, and the higher the saturation and brightness of the color; The absorbency of paper refers to the degree to which it absorbs binders, diluents, etc. in ink. If the paper has strong absorbency and quickly absorbs the binder and diluent in the ink, the pigment particles cannot be adequately protected, and the ink film will appear dull and dull.