სპილენძის ფირფიტა შექმნილია ტრაფარეტული ბეჭდვით. იმის გამო, რომ დაუფარავი ქაღალდის ბოჭკოების ზედაპირი არათანაბარია და ხარისხი გაცილებით დიდია, ვიდრე წერტილის დიამეტრი, some dot just in the gap between the fibers and can not transfer the ink to the paper, so that the image pixel can not be reproduced in this part. After the coated pulp is calendered, the particles on the surface of the paper are smaller than the diameter of the dot, and the ink receptivity of the pulp is better than that of the cellulose fiber. ამიტომ, the dot can be reproduced correctly. Obviously, the printing performance of coated paper is better than uncoated paper.
The base paper of copperplate is made of high-quality roll newsprint or offset printing paper, and the high-grade base paper is made of special base paper. The surface coating is firmly adhered to the base paper. After super calendering, the coating is firm, no bubbles, no streaks, strong luster and high smoothness. The smoothness of coated paper is generally more than 600s, more than 10 times higher than offset paper. Ამგვარად, the copperplate paper can be in close contact with the printing plate and print out the dot clearly. The pH value of the coated paper is about 7, which has no adverse effect on the wetting solution of lithography and the drying process of ink. On the coated paper, the ink adheres fast and dries fast. After drying, it can also set off the luster. The dot has good reproducibility. The ink layer is thin and the image is clear, and the dot is bright and clean. The dimensional stability of copperplate paper is also better than offset paper. Printing on copperplate paper can meet the requirements of overprinter accuracy. The tensile strength and surface strength of the coated paper are also high enough to resist the large tensile force produced by the sticky ink film used. As a result of the above points, high-grade printing products are often printed on copperplate paper.
