In the screen printing industry, screen printing needs to use mesh, and the number of mesh is selected according to the requirements of printed matter. "Mesh" is the specification unit of screen, which refers to the number of holes in the length of 1 inch (25.4 mm). Millimeter is a simple unit of length. Because there are corresponding technical standards for the production of screens, screens with different sizes and mesh numbers have specified line diameters, so simply speaking, each hole of screens with different mesh numbers is not an actual line diameter. Mesh cloth can be divided into two kinds of weaving methods, PW stands for flat weaving TW stands for diagonal weaving, and can also be divided into white and yellow: W = white Y = yellow. At present, most of the screens widely used in the screen printing industry are domestic products such as SEFAR in Switzerland, Shadi in Italy, NBC and Smart in Japan and Hehuang.
Classification:
Single-yarn nylon mesh yarn
Single-yarn nylon mesh: suitable for general screen printing factories, clothing printing factories, handbags screen printing, plexiglass, plastic panels and other screen printing. Polyester net is also made of chemical synthetic fibers and belongs to polyester system. Polyester wire mesh has the advantages of solvent resistance, high temperature resistance, water resistance and chemical resistance. When the external pressure is large, its physical properties are stable and its ductility is small. Its disadvantage is that compared with nylon wire mesh, its wear resistance is poor. Besides the advantages of nylon screen printing, polyester screen is also suitable for printing printed circuit boards with high dimensional accuracy.
Nylon wire mesh
Nylon mesh: made of chemical synthetic fibers, belonging to polyamide series. Nylon mesh has high strength, good wear resistance, chemical resistance, water resistance and elasticity. Because the line diameter is uniform and the surface is smooth, the ink passability is also very good. Its disadvantage is that the tensile properties of nylon mesh are large. After a period of time, the tension of this screen decreases, which makes the screen printing plate loose and the accuracy decreases. Therefore, it is not suitable for printing circuit boards with high dimensional accuracy.
Stainless steel metal mesh
Stainless steel wire mesh: made of stainless steel material. Stainless steel wire mesh is characterized by good wear resistance, high strength and low technical elongation; Because of the thin line diameter, the ink has good passing performance; The mechanical and chemical properties of the screen are stable and the dimensional accuracy is stable. Its disadvantages are poor elasticity and high price. After the screen is stretched, it cannot be restored to its original state. Stainless steel screen is suitable for high-precision printing of circuit boards and integrated circuits. Screen is divided into metal mesh and chemical fiber mesh, and its name is screen, mesh, screen and so on. , various specifications, wide range of uses.