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    What is the effect of paper grain fo printing

    Grain of paper refers to the direction of paper fiber, which is parallel to the moving direction of paper machine, also known as machine direction (MD), and cross direction (CD) which is perpendicular to the running direction of paper machine. Many properties of paper have obvious directionality. The tensile force and kneading resistance in the longitudinal direction (MD) are relatively strong, while the tearing degree is relatively weak and easy to tear off. Because the grain is longitudinal, it is difficult to tear off in the transverse direction. After the web is cut into flat sheet, its grain has two names: 1. Long grain, also known as straight grain, referred to as LG, its grain goes along the long side, that is, the paper fiber is parallel to the long side. 2. Short grain (short grain), also known as transverse grain, referred to as SG, its grain along the short side, that is, the paper fiber and short side parallel. The natural pattern of paper is an absolute concept, which is different from the pattern of paper embossing. Long or short lines of paper is a relative concept, relative to the size of the paper. If a positive paper is long grain, after the split is short grain.

     

    Therefore, in the book printing process, if you do not pay attention to the paper texture, then the printing effect can be very different. Especially in case or bag printing. In order to save costs, some printing factories cut the paper at will when they open the paper, regardless of the direction of the paper grain. As a result, some packaging boxes produced are relatively strong, but some packaging boxes are relatively weak, some packaging boxes are always easy to break, and some packaging boxes will not have problems for a long time. Especially for handbag printing, a large part of the parting bags are three open, and the horizontal one-third of the paper grain is far away from the vertical one. If paper itself is not good paper, the difference is even greater. Such products are absolutely not allowed in high-end printed matter. Some book printing salesmen have been working for several years, but they still don't understand this truth. They are all the same paper. Why do they produce some solid and some weak results? Some edges are always broken, but some are intact. Some edges are rough and some are smooth and clean.



    Release Date: 04-09-2021 17:39:24 [Go back Menu]
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