In printing, paper is closely related to it. Paper is also divided into copperplate paper and art paper. In printing, paper occupation is a big cost, and the storage of paper in printing factory is also a key problem.
The storage of paper is a very important work. In the process of transportation, the paper must not be thrown from high to low, so as to avoid the occurrence of loose parts and damage. The paper should not be stored and transported vertically, but should be placed horizontally. It is not suitable to park in the open air for too long. It should be moved into the workshop or warehouse in time.
Paper moisture, paper is very sensitive to the humidity of the air, the moisture content of the paper always changes with the change of humidity in the air. Storage of paper warehouse should be clean, dry, or directly in the offset printing workshop, paper stack to leave the ground for a distance, to leave the wall. The indoor relative humidity of the storage place should be kept at 60% - 70%, and the room temperature should be 18-22 ℃.
The paper must avoid direct sunlight exposure, otherwise it will be brittle and yellow due to the evaporation of water in the paper, and it will make the paper warped. If it is deformed, printing cannot be used. The paper is heat proof. The paper should not be stored in the place where the temperature is too high. When the general paper is exposed to the high temperature of more than 38 ℃, its strength will be significantly reduced, and it will be warped, especially the coated paper will be bonded into blocks, resulting in scrap. Paper folding, paper storage should be flat stack, avoid a fold three fold as placement, stacking, must not make the two ends of the paper staggered prominent, otherwise the protruding part is easy to deteriorate.
The thickness, tightness, smoothness, dust content, water content, pH value of printing paper and their influence on offset printing directly affect the quality of printed matter and the printing speed. If the thickness of the paper is uniform, the quality of printing will be better.
Smoothness, the smoothness of the paper is the smoothness of the paper surface, smooth degree, smooth speed on the machine can also be smooth, improve the printing speed, print is relatively clear.
The paper is the key to printing. The printing factory should control the temperature and humidity of the workshop. If there is a shortage of paper, it can stock up. The price of commonly used paper should be kept unchanged, and the inventory should be as small as possible. It can also reduce the capital pressure when it is used.