Factors Affecting Paper Absorption 1 The ink absorption of paper is related to the smoothness of the paper fiber surface. The smoother the surface of the paper, the weaker its ink absorption, the surface of the paper is rough, the paper is loose, and the ink absorption is stronger.
2 The ink absorption of paper is related to the quality of the filler. If kaolin (white clay) is selected as the papermaking filler, the paper will have good ink absorption. The use of talc, gypsum powder, calcium carbonate, magnesium hydroxide, barium sulfate as filler, the ink absorption is weaker.
3 The ink absorption of the paper is related to the amount of glue applied during the papermaking process. Appropriate application of rubber can enhance the paper's ink absorption.
4 The absorption of ink by paper is related to the pressure of the printing press and the length of the printing time. Large printing pressure, long stamping time, strong paper absorption, and vice versa.
5 is related to the viscosity of the ink used for printing. The viscosity of the ink is large, and the ink absorption of the paper will be strong.
6 related to the structure of the paper itself. Papers containing more lignin are more absorbent, such as newsprint. In the process of papermaking, the paper with less filler or compound has higher ink absorption.
Why do some papers have strong ink absorption, and some papers have poor ink absorption? This is because the absorption of ink and the absorption of ink by paper are caused by the mutual action of both paper and ink. Too much or too weak ink absorption of the paper has an impact on the quality of the printed product. The ink absorption of the paper is too strong. The binder in the ink will be absorbed in large quantities by the paper. Although the drying of the print is accelerated, it is likely to result in imprinting failure. The disadvantages of “powdering†and “printing through†and poor glossiness of printed products; on the contrary, the ink absorption of the paper is too weak, and the linking material in the ink cannot be absorbed normally, resulting in the imprint being unable to dry as expected and delaying the process. The ink layer is dry, which may cause the back of the printed product to be dirty.
In summary, the paper's ink absorption is closely related to the quality of the printed product, and it is necessary to take corresponding measures to improve the printing quality in accordance with the ink absorption performance of the paper, respectively, the printability of the high-speed ink and the control of the amount of dry oil.