What are the main characteristics of silk screen printing materials? What problems should be noticed when using different texture screens? This article will elaborate on the above issues.
1. What are the main characteristics of silk screen printing materials?
Mesh screens commonly used in screen printing are nylon mesh, nylon mesh, polyester mesh, and stainless steel mesh. The main features of various screens are the following.
1 Tensile strength [g (g)/D (diameter)] gauze is 3.7-4.1 g (g)/D diameter), nylon gauze is 4.5-5.8 g (g)/D (diameter) ), Polyester mesh 4.3-5.5g (grams) / D (diameter), stainless steel mesh 1.5g (grams) / D (diameter).
2 Dry-wet strength ratio (%) The net weight is 92% to 100%, nylon mesh is 89% to 90%, polyester mesh is 100%, and stainless steel mesh is 100%.
3 Nodule Strength [g (grams)/D (diameter)] Netting is 2.9 g (grams)/D (diameter), nylon mesh is 4.5-5.4 g (g)/D (diameter), Polyester mesh is 3.4-4.4g (g)/D (diameter).
4 tensile elongation (%) 8-22% of netting, nylon screen 26-32%, polyester screen 16"30%, stainless steel screen 38%.
5 Dry-wet elongation ratio (%) A mesh thickness of 134% for nylon 120, 115" 122% for nylon mesh, 100% for polyester mesh, and 100% for stainless steel mesh.
6 Tensile recovery rate (%, calculated with 3% extension) The stencil net is 80-aluminum material moment of inertia and steel material has a 15.88-centimeter square of inertial moment, and the cross-section of the wooden net frame has a solid rectangle ( 5 x 4 cm), moment of inertia 41.667 cm 4th power.
7 Density in units of grams per cubic centimeter. The wood density is 0.9 g/cm3, the steel density is 7.8 g/cm3, and the aluminum density is 2.7 g/cm3.
8 Thermal expansion coefficient (10'/°C). The thermal expansion coefficient of the aluminum material is 2.410'/°C, the thermal expansion coefficient of the steel material is 1.2 10'/°C, and the thermal expansion coefficient of the wood material is 3.0 10'/°C.
Second, screen printing with nylon mesh What are the characteristics?
Nylon mesh is made of chemically synthetic fibers and belongs to the polyamide family. Nylon mesh has high strength, abrasion resistance, chemical resistance, water resistance, and elasticity are all better. Because the wire diameter is uniform and the surface is smooth, the ink passability is also excellent. The disadvantage is that the stretchability of the nylon mesh is large. This kind of wire mesh has a reduced tension after stretching for a period of time, which causes the screen printing plate to loosen and the precision to decrease. Therefore, it is not suitable to print circuit boards with high dimensional accuracy.
Third, what are the characteristics of silk screen printing polyester mesh?
Polyester mesh is also made of chemically synthetic fibers and belongs to the polyester family. Polyester mesh screen has the advantages of solvent resistance, high temperature resistance, water resistance, and chemical resistance. Polyester mesh screen has stable physical properties and small stretchability when external pressure is large. The disadvantage is the poor wear resistance compared to nylon mesh. In addition to the advantages of nylon screen printing, polyester screens are also suitable for printed circuit boards that require high dimensional accuracy.
What are the characteristics of stainless steel screens for screen printing?
Stainless steel mesh is made of stainless steel. Stainless steel wire mesh is characterized by good wear resistance, high strength, and low mechanical elongation. Due to the fine wire diameter, the ink has good passability; the mechanical and chemical properties of the wire mesh are stable, and the dimensional accuracy is stable. The lack of flexibility is poor, and the price is more expensive. After the screen is stretched, it cannot be restored to its original shape. Stainless steel wire mesh is suitable for high-precision printing such as circuit boards and integrated circuits.
Reprinted from: Screen Printing Special Printing Industry
