Do you know the type of printing screen?
Apr. 24, 2020
Silkscreen printing is to stretch silk fabric, synthetic fiber fabric or metal wire mesh on the screen frame, and use manual engraving lacquer film or photochemical plate making method to make a screen printing plate. It is also possible to use photosensitive materials to make screen printing plates by photo-engraving (making the screen holes in the graphic part of the screen printing plate through holes, but not the screen holes in the graphic part). When printing, the ink is transferred to the substrate through the mesh of the graphic part through the squeeze of the scraper, forming the same graphic as the original. The screen printing equipment is simple, the operation is convenient, the printing and plate making is simple, the cost is low, and the adaptability is strong. The following silk screen printing mesh supplier introduces you to the types of printing screens and their advantages and disadvantages.
The silkscreen is the earliest plate material used for screen printing plates. In the past, some screen printing technology books often called it silkscreen, natural silkscreen, silkscreen, real silkscreen, raw silk screen, and so on.
The characteristics of silk screen are strong water resistance, certain hygroscopicity, good connection with photosensitive glue or photosensitive film, general elasticity, easy to stretch the net, and simple plate making operation. However, the silkscreen has poor abrasion resistance and chemical resistance, is prone to aging and becomes brittle, the tension value of the stretched net is small, and the cost is also high.
At present, in the manufacture of screen printing plates, silkscreens have been largely replaced by synthetic fiber screens, and the amount used is very small.
2. Nylon (nylon) wire mesh
Nylon wire mesh, also known as nylon wire mesh, is a nylon monofilament woven product, which is woven for heat resistance and standard stability. level
The pattern arrangement can be up to 380 mesh, and the twill arrangement is greater than 330 mesh.
The nylon mesh has the following characteristics: the nylon mesh has a smooth surface, good ink permeability, and can use inks with large viscosity and large particles so that precise printed pictures can be obtained; the use of extremely fine mesh woven mesh, suitable for thin lines Drawing pictures and dot printing; large elasticity, appropriate flexibility, good adaptability to substrates, suitable for printing of bumps and curved surfaces; tensile strength, knots
Good fastness, elasticity and conflict resistance, long service life; good acid resistance, chemicals, and organic solvents, simple regeneration, and use
Single, very resistant to alkalis.
The use of nylon mesh should pay attention to the following points: compared with polyester and silk mesh, nylon mesh has a larger elongation rate. In order not to cause printing defects, the tension of the stretched mesh should be increased, and the shortening force will also increase at this time It is necessary to use a strong net frame and a net stretcher; because of its low heat resistance, if the net is fixed to the frame through the hot melt method, it is difficult from the operability point of view; Corrosion caused by formic acid; ultraviolet light has a slight effect on it, so keep away from light during storage.
4. Stainless steel wire mesh
The surface stability of the stainless steel wire mesh is excellent, the size of the produced graphics is stable, and it is suitable for printing high-precision circuit boards and other products; the ink passing performance is excellent; the alkali resistance and tensile strength are very good; Strong, suitable for the printing of hot-melt printing materials (the electric heating on the silkscreen melts the printing materials). Its shortcomings are: easy to be twisted and damaged by an external force, easy to slacken the mesh due to pressure during the printing process, affecting the durability of printing, expensive and expensive.
5. Nickel-plated polyester wire mesh
The nickel-plated polyester wire mesh is made by coating a layer of nickel material with a thickness of about 2 to 5 μm on the polyester mesh. It combines the length of both the metal mesh and the polyester mesh to produce a high-tensile, low-elongation screen, which avoids the slack caused by the metal fatigue of the metal mesh and the low binding force between the polyester mesh and the plate membrane. Wear resistance, electrical conductivity, and resilience have been improved. Therefore, the applicability of this network is very wide. The braided nodes of this mesh are fixed by nickel plating, the mesh is not easy to deform during printing, the ink flow is smooth, and the thickness of the printed ink layer is uniform. The disadvantage of this kind of mesh is that it needs less resistance to the oxidizing liquid used for stripping; the price is higher than that of a polyester mesh but cheaper than stainless steel mesh.
6. Flatten the wire mesh
Flattened wire mesh is made by flattening one side of the wire mesh. This silkscreen can reduce the amount of ink transfer, make the ink layer thinner, and prevent the ink from penetrating and spreading. It is especially suitable for ultraviolet curing inks. The thickness and opening of the flattened screen will become smaller due to flattening, so only a small amount of ink can be used for printing. Flattening the silkscreen is very beneficial for improving the printing suitability of ink, reducing the amount of over-inking and saving ink. Some people think that due to this deformation, it will reduce the wear of the blade, improve the penetration of ink, and protect the plating film.
7. Anti-static wire mesh
The use of nylon, polyester, and other synthetic fibers are woven into a wire mesh is easy to carry static electricity, which is a big disadvantage. Although there are a variety of methods to prevent electrification, they are not perfect, especially when drying, some substrates cannot completely remove static electricity. Anti-static wire mesh In order to make the horizontal wire conductive, the core of the wire contains carbon fine wire, which has a good effect of eliminating static electricity.
8. Colored wire mesh
During the exposure of the screen printing plate-making process, halo appearance often occurs, and unnecessary reflected light will form exposure defects. The reason for this appearance is the random reflection from the wire as the material of the silkscreen. Therefore, it is only necessary to prevent random reflection and absorb the reflected light. The exposure usually uses an ultraviolet light source, but it is also mixed with visible light. The color of the dyed silkscreen is preferably light, and the dark color should extend the exposure time.
9 Nickel foil perforated mesh
Nickel foil perforated mesh is a high-skilled wire mesh. It is not a woven mesh, but a foil mesh, that is, it is formed by drilling nickel foil, and its holes are hexagonal, and it can also be made into a circular hole shape by electrolytic forming. The entire mesh surface is flat and thin, which can greatly improve the stability and precision of the imprint. It is used to print highly-skilled products such as conductive inks, wafers, and integrated circuits. Can distinguish the circuit line distance of 0.1mm,
The positioning accuracy can reach 0.01mm.
10. Edged steel wire mesh
This is a kind of wire mesh portrayed for the lack of elasticity of stainless steel wire, that is, special elastic materials are used near the steel mesh
An elastic edge is inserted, and the drawing area is scattered within the steel mesh.
Through the study of this article, I believe that you have more understanding of the printing screen, if you have any questions about our products, please contact us at random.