At present, the most commonly used screen types are nylon (also called nylon) screens and polyester (also called polyester) screens. Metal wires are generally used only under certain conditions, and silk screens have basically been eliminated. The types of screens are listed in Table 2-1.
1. Silk Silk Screen Silk Silk Silk Screen is the earliest plate material used in screen printing plates. In the past, some silk screen printing technology materials often referred to as silk nets, natural silk nets, silk screens, and real silk screens. Raw silk screens, etc.
The characteristics of silk screens are: strong water resistance, a certain hygroscopicity, good adhesion to photosensitive or photosensitive films, general elasticity, easy stretch netting, and easy plate making operations. However, silk screens have poor abrasion resistance and chemical resistance, are susceptible to aging and are brittle, have a small stretch-tension value, and have high costs.
At present, in the screen printing plate production, the silk screen has been mostly replaced by a synthetic fiber screen, and the amount is small.
2. Nylon (Nylon) Wire Mesh <br><br><br><br><br><br> Nylon Nylon (Nylon) Silk Screen <br> Nylon Wire Mesh Nylon Wire Mesh Nylon Wire Mesh Plain weave can reach 380 mesh and twill weave is larger than 330 mesh.
Nylon mesh has the following characteristics: The nylon mesh has a smooth surface and good ink permeability. It can use inks with large viscosity and large particles, so it can get fine printing patterns; use a very fine mesh weaving mesh network, suitable for thin lines Drawing pattern and dot printing; elasticity, appropriate flexibility, good adaptability to the substrate, suitable for printing on convex and concave surfaces; tensile strength, nodule fastness, elasticity and good abrasion resistance, long service life Resistant to acid, chemicals and organic solvents, it is easy to regenerate, but it is extremely resistant to alkali.
The use of nylon mesh should pay attention to the following points: Nylon silk screen compared with polyester, silkworm silk screen, its elongation is large, so as not to cause the printing failure, to increase the stretching tension, then the contraction force will increase, Therefore, it is required to use a strong frame and stretcher; because of its low heat resistance, if the mesh is fixed on the frame by the hot-melt method, it is difficult from the viewpoint of operability; it is not resistant to strong acid, stearic acid, cresol Erosion of formic acid, etc.; Ultraviolet light has a slight influence on it, and care is taken to avoid light during storage.
3. Polyester (polyester) screen <br> Polyester screen is also called ester screen.
Polyester mesh has the following characteristics: It has small tensile elongation and strong elasticity. The single wire mesh is suitable for high-precision printed matters such as printed integrated circuits, thick film semiconductors, scale plates, and count plates; tensile strength, structural strength, resilience, and resistance Printing force is good; has sufficient chemical resistance, especially strong acid resistance, strong resistance to organic solvents, and can be used like nylon renewable; low moisture absorption, almost free from humidity; heat resistance than nylon High; affected by ultraviolet light is smaller than nylon.
The following points should be taken into account when using: Polyester mesh has good dimensional stability and is suitable for high-precision printing. Therefore, it needs more stretch tension than nylon mesh, which requires stronger frame, stretcher and more. Strong adhesion method; Polyester due to hydrophobicity, adhesion to the plate is difficult, pay attention to the plate before washing, degreasing; Although low hygroscopicity, but not resistant to prolonged boiling water; Over ink Nylon is slightly poor; resistant to alkali attack.
4.Stainless Steel Wire Mesh <br> Stainless steel wire mesh has excellent plane stability and stable dimensionality. It is suitable for printing high-precision circuit boards and other products; the ink has excellent performance; alkali resistance and tensile strength are very good; Excellent resistance to chemicals, high heat resistance, suitable for printing of hot-melt printing materials (electrically heated on the screen to melt the printing material). The disadvantages are: it is easy to be twisted and damaged by the external force, and the net wire is easy to be pressed by the press during the printing process, which affects the resistance to the printing force, and the price is high and the cost is high.
5. Nickel plated polyester mesh <br><br><br> Nickel plated polyester mesh is made by plating a layer of nickel material with a thickness of about 2 to 5 μm on the polyester web. It combines the lengths of both metal mesh and polyester mesh to produce high-tension, low-stretch screens, avoiding the disadvantages of metal mesh fatigue caused by metal fatigue and low adhesion of polyester mesh to the film. Wear resistance, electrical conductivity and resilience have all improved. Therefore, the applicability of this kind of network is very wide. The weaving node of this net is fixed by nickel plating, and the mesh is not easy to be deformed during printing, the ink is circulated smoothly, and the thickness of ink layer is even and thick.
The disadvantage of this type of net is that the resistance to stripping the oxidizing solution is poor; the price is higher than the polyester net, but inexpensive in the stainless steel wire mesh.
6. Flattening the screen <br> Pressing the screen is made by flattening one side of the screen. The screen can reduce the amount of ink transferred, the ink layer is thin, and can prevent the ink from penetrating, paving, especially for UV curable ink. Since the thickness and the opening of the flattened wire mesh are reduced due to flattening, only a small amount of ink can be used for printing. Flattening the screen is very advantageous for improving ink printability, reducing the amount of ink and saving ink. Since the profile of the flattened wire mesh is deformed as shown in Figure 2-3, it is thought that due to this deformation, the wear of the blade is reduced, the ink permeability is enhanced, and the plate is protected.
7. Anti-static screen <br><br><br><br> The use of nylon, polyester and other synthetic fibers woven into the screen is easy to electrostatic, is a big drawback. Although there are several ways to prevent electrification, they are not perfect. Especially when drying, some substrates cannot completely remove static electricity. Anti-static mesh screen shown in Figure 2-4, in order to make the horizontal line conductive, the core contains carbon filament, the effect of eliminating static electricity is very good.
8. Colored Wire Mesh <br> When the screen printing plate process is exposed, halo phenomenon often occurs, and unnecessary reflected light will cause exposure defects.
The reason for this phenomenon comes from the random reflection of the wire as the material of the screen. Therefore, a colored screen is generally used so long as it does not cause irregular reflection and absorbs reflected light.
Exposure generally uses a UV light source, but it also mixes with visible light. The tint of the dyeing screen is better with lighter colors, and darker colors have longer exposure time.
9. Nickel foil perforated mesh <br> Nickel foil perforated mesh is a high-tech silk screen. It is not a woven net, but a foil net, that is, a hole made of nickel foil. The hole has a hexagonal shape, and it can also be made into a round hole shape by electrolytic forming. The entire mesh surface is even and thin, which can greatly improve the stability and precision of imprinting. It can be used to print high-tech products such as conductive inks, wafers, and integrated circuits. Can distinguish 0.1mm circuit line spacing, positioning accuracy of up to 0.01mm.
10.Beaded Steel Wire Mesh This is a kind of wire mesh designed for the lack of elasticity of stainless steel wire, that is, using a special elastic material to adjoin an elastic edge around the steel mesh, and the image area is distributed within the steel mesh. .
1. Silk Silk Screen Silk Silk Silk Screen is the earliest plate material used in screen printing plates. In the past, some silk screen printing technology materials often referred to as silk nets, natural silk nets, silk screens, and real silk screens. Raw silk screens, etc.
The characteristics of silk screens are: strong water resistance, a certain hygroscopicity, good adhesion to photosensitive or photosensitive films, general elasticity, easy stretch netting, and easy plate making operations. However, silk screens have poor abrasion resistance and chemical resistance, are susceptible to aging and are brittle, have a small stretch-tension value, and have high costs.
At present, in the screen printing plate production, the silk screen has been mostly replaced by a synthetic fiber screen, and the amount is small.
2. Nylon (Nylon) Wire Mesh <br><br><br><br><br><br> Nylon Nylon (Nylon) Silk Screen <br> Nylon Wire Mesh Nylon Wire Mesh Nylon Wire Mesh Plain weave can reach 380 mesh and twill weave is larger than 330 mesh.
Nylon mesh has the following characteristics: The nylon mesh has a smooth surface and good ink permeability. It can use inks with large viscosity and large particles, so it can get fine printing patterns; use a very fine mesh weaving mesh network, suitable for thin lines Drawing pattern and dot printing; elasticity, appropriate flexibility, good adaptability to the substrate, suitable for printing on convex and concave surfaces; tensile strength, nodule fastness, elasticity and good abrasion resistance, long service life Resistant to acid, chemicals and organic solvents, it is easy to regenerate, but it is extremely resistant to alkali.
The use of nylon mesh should pay attention to the following points: Nylon silk screen compared with polyester, silkworm silk screen, its elongation is large, so as not to cause the printing failure, to increase the stretching tension, then the contraction force will increase, Therefore, it is required to use a strong frame and stretcher; because of its low heat resistance, if the mesh is fixed on the frame by the hot-melt method, it is difficult from the viewpoint of operability; it is not resistant to strong acid, stearic acid, cresol Erosion of formic acid, etc.; Ultraviolet light has a slight influence on it, and care is taken to avoid light during storage.
3. Polyester (polyester) screen <br> Polyester screen is also called ester screen.
Polyester mesh has the following characteristics: It has small tensile elongation and strong elasticity. The single wire mesh is suitable for high-precision printed matters such as printed integrated circuits, thick film semiconductors, scale plates, and count plates; tensile strength, structural strength, resilience, and resistance Printing force is good; has sufficient chemical resistance, especially strong acid resistance, strong resistance to organic solvents, and can be used like nylon renewable; low moisture absorption, almost free from humidity; heat resistance than nylon High; affected by ultraviolet light is smaller than nylon.
The following points should be taken into account when using: Polyester mesh has good dimensional stability and is suitable for high-precision printing. Therefore, it needs more stretch tension than nylon mesh, which requires stronger frame, stretcher and more. Strong adhesion method; Polyester due to hydrophobicity, adhesion to the plate is difficult, pay attention to the plate before washing, degreasing; Although low hygroscopicity, but not resistant to prolonged boiling water; Over ink Nylon is slightly poor; resistant to alkali attack.
4.Stainless Steel Wire Mesh <br> Stainless steel wire mesh has excellent plane stability and stable dimensionality. It is suitable for printing high-precision circuit boards and other products; the ink has excellent performance; alkali resistance and tensile strength are very good; Excellent resistance to chemicals, high heat resistance, suitable for printing of hot-melt printing materials (electrically heated on the screen to melt the printing material). The disadvantages are: it is easy to be twisted and damaged by the external force, and the net wire is easy to be pressed by the press during the printing process, which affects the resistance to the printing force, and the price is high and the cost is high.
5. Nickel plated polyester mesh <br><br><br> Nickel plated polyester mesh is made by plating a layer of nickel material with a thickness of about 2 to 5 μm on the polyester web. It combines the lengths of both metal mesh and polyester mesh to produce high-tension, low-stretch screens, avoiding the disadvantages of metal mesh fatigue caused by metal fatigue and low adhesion of polyester mesh to the film. Wear resistance, electrical conductivity and resilience have all improved. Therefore, the applicability of this kind of network is very wide. The weaving node of this net is fixed by nickel plating, and the mesh is not easy to be deformed during printing, the ink is circulated smoothly, and the thickness of ink layer is even and thick.
The disadvantage of this type of net is that the resistance to stripping the oxidizing solution is poor; the price is higher than the polyester net, but inexpensive in the stainless steel wire mesh.
6. Flattening the screen <br> Pressing the screen is made by flattening one side of the screen. The screen can reduce the amount of ink transferred, the ink layer is thin, and can prevent the ink from penetrating, paving, especially for UV curable ink. Since the thickness and the opening of the flattened wire mesh are reduced due to flattening, only a small amount of ink can be used for printing. Flattening the screen is very advantageous for improving ink printability, reducing the amount of ink and saving ink. Since the profile of the flattened wire mesh is deformed as shown in Figure 2-3, it is thought that due to this deformation, the wear of the blade is reduced, the ink permeability is enhanced, and the plate is protected.
7. Anti-static screen <br><br><br><br> The use of nylon, polyester and other synthetic fibers woven into the screen is easy to electrostatic, is a big drawback. Although there are several ways to prevent electrification, they are not perfect. Especially when drying, some substrates cannot completely remove static electricity. Anti-static mesh screen shown in Figure 2-4, in order to make the horizontal line conductive, the core contains carbon filament, the effect of eliminating static electricity is very good.
8. Colored Wire Mesh <br> When the screen printing plate process is exposed, halo phenomenon often occurs, and unnecessary reflected light will cause exposure defects.
The reason for this phenomenon comes from the random reflection of the wire as the material of the screen. Therefore, a colored screen is generally used so long as it does not cause irregular reflection and absorbs reflected light.
Exposure generally uses a UV light source, but it also mixes with visible light. The tint of the dyeing screen is better with lighter colors, and darker colors have longer exposure time.
9. Nickel foil perforated mesh <br> Nickel foil perforated mesh is a high-tech silk screen. It is not a woven net, but a foil net, that is, a hole made of nickel foil. The hole has a hexagonal shape, and it can also be made into a round hole shape by electrolytic forming. The entire mesh surface is even and thin, which can greatly improve the stability and precision of imprinting. It can be used to print high-tech products such as conductive inks, wafers, and integrated circuits. Can distinguish 0.1mm circuit line spacing, positioning accuracy of up to 0.01mm.
10.Beaded Steel Wire Mesh This is a kind of wire mesh designed for the lack of elasticity of stainless steel wire, that is, using a special elastic material to adjoin an elastic edge around the steel mesh, and the image area is distributed within the steel mesh. .
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