1 The mesh number and fineness of the screen
The mesh number of the screen indicates the number of meshes that are held in each linear unit length of the screen. The larger the number, the finer the screen. The fineness of the screen refers to the density of the mesh, which mainly depends on the mesh number of the screen and the thickness of the screen, and is usually represented by S, M, T, and HD. S is fine, M is medium, T is thick, and HD is extra thick. With the same number of meshes and screens, the area of ​​fine mesh openings is large, and the area of ​​coarse mesh openings is small. The number of screen meshes directly affects the change in the tone value of the printed matter. When the diameter of the mesh is constant, it is generally about 0.03 mm. If the number of screen wires is increased, that is, the mesh number of the screen is increased, the opening area is reduced accordingly. . The thickness of the screen is related to the fineness of the screen.
2 wire diameter
The wire diameter is usually expressed in micrometers. The smaller the wire diameter, the larger the area of ​​the opening. The finer the mesh, the worse the corrosion resistance of the corrosive solvent and the worse the wear resistance of the ink and the squeegee. The wire diameter assembly improves the stencil's resistance to printing.
3 mesh aperture and opening area
The mesh aperture is the distance between the opposite edges of two adjacent meshes. The open area is inversely proportional to the mesh size and mesh diameter. Therefore, the higher the mesh size, the smaller the mesh opening area. The area of ​​the wire mesh opening is particularly important for determining the amount of ink leaked from the screen. The larger the area of ​​the opening, the more ink is attached through the mesh, the thicker the mesh, the larger the area of ​​the opening, and the more transparent the ink. The more you deposit. The screen aperture is three times the solid ink particle size when printing in the field. Calculation of open area: for example 120T screen, mesh diameter 0.033mm. Calculate the total mesh width within 1 cm: 0.033 x 120 = 3.96 mm. The total width of the screen within 1 cm: 10-3.96 = 6.04mm. Each mesh width: 6.04÷120=0.050333mm. The mesh area including meshes (d+w) 0.033+0.050333=0.0833 mm, 0.0833×0.0833=0.0069388 cm 2 . Screen mesh area: 0.05033×0.05033=0.002533 square centimeters. The mesh opening rate: 0.002533 ÷ 0.0069388×100%=36%.
4 mesh thickness
The thickness of the mesh is determined by the number of meshes, the diameter of the mesh, and the weaving structure of the mesh, but the thickness of the mesh depends mainly on the diameter of the mesh. A thicker or thinner screen will produce a thicker or thinner ink adhesion that will affect the theoretical ink volume calculation of the screen.
5 theoretical ink volume
The theoretical ink volume is the maximum amount of ink needed to fill the mesh openings. Expressed in cubic centimeters per square meter. The theoretical ink volume can only be used to simply estimate or predict the ink consumption. The correct ink consumption and ink layer thickness can only be calculated based on the full understanding of the printing medium, such as ink. Percentage of solvent/diluent: specific gravity, solids content, viscosity. There are also the screen weaving structure, the type of template, scraper hardness, side shape, pressure and angle, mesh size, screen tension, type of printing machine will also affect the ink consumption.
6 Main Characteristics of Wire Mesh Material
1 Tensile strength [g (grams) / D (diameter)] ytterbium net is 3.7-4.1g / D), nylon mesh is 4.5-5.8g / D), polyester mesh is 4.3-5.5g / D ), Stainless steel wire mesh is 1.5g/D).
2 Dry-wet strength ratio (%) 92-100% of the net, 89-90% of the nylon screen, 100% of the polyester screen, and 100% of the stainless steel screen.
3 Nodule strength [g (grams) / D (diameter)] The netting was 2.9 g/D, the nylon web was 4.5-5.4 g/D, and the polyester web was 3.4-4.4 g/D.
4 Tensile elongation (%) The net is 8-22%, the nylon screen is 26-32%, the polyester screen is 16-30%, and the stainless steel screen is 38%.
5 Dry-wet elongation ratio (%) One 134% of the net 120, 115-122% of the nylon screen, 100% of the polyester screen, and 100% of the stainless steel screen.
The mesh number of the screen indicates the number of meshes that are held in each linear unit length of the screen. The larger the number, the finer the screen. The fineness of the screen refers to the density of the mesh, which mainly depends on the mesh number of the screen and the thickness of the screen, and is usually represented by S, M, T, and HD. S is fine, M is medium, T is thick, and HD is extra thick. With the same number of meshes and screens, the area of ​​fine mesh openings is large, and the area of ​​coarse mesh openings is small. The number of screen meshes directly affects the change in the tone value of the printed matter. When the diameter of the mesh is constant, it is generally about 0.03 mm. If the number of screen wires is increased, that is, the mesh number of the screen is increased, the opening area is reduced accordingly. . The thickness of the screen is related to the fineness of the screen.
2 wire diameter
The wire diameter is usually expressed in micrometers. The smaller the wire diameter, the larger the area of ​​the opening. The finer the mesh, the worse the corrosion resistance of the corrosive solvent and the worse the wear resistance of the ink and the squeegee. The wire diameter assembly improves the stencil's resistance to printing.
3 mesh aperture and opening area
The mesh aperture is the distance between the opposite edges of two adjacent meshes. The open area is inversely proportional to the mesh size and mesh diameter. Therefore, the higher the mesh size, the smaller the mesh opening area. The area of ​​the wire mesh opening is particularly important for determining the amount of ink leaked from the screen. The larger the area of ​​the opening, the more ink is attached through the mesh, the thicker the mesh, the larger the area of ​​the opening, and the more transparent the ink. The more you deposit. The screen aperture is three times the solid ink particle size when printing in the field. Calculation of open area: for example 120T screen, mesh diameter 0.033mm. Calculate the total mesh width within 1 cm: 0.033 x 120 = 3.96 mm. The total width of the screen within 1 cm: 10-3.96 = 6.04mm. Each mesh width: 6.04÷120=0.050333mm. The mesh area including meshes (d+w) 0.033+0.050333=0.0833 mm, 0.0833×0.0833=0.0069388 cm 2 . Screen mesh area: 0.05033×0.05033=0.002533 square centimeters. The mesh opening rate: 0.002533 ÷ 0.0069388×100%=36%.
4 mesh thickness
The thickness of the mesh is determined by the number of meshes, the diameter of the mesh, and the weaving structure of the mesh, but the thickness of the mesh depends mainly on the diameter of the mesh. A thicker or thinner screen will produce a thicker or thinner ink adhesion that will affect the theoretical ink volume calculation of the screen.
5 theoretical ink volume
The theoretical ink volume is the maximum amount of ink needed to fill the mesh openings. Expressed in cubic centimeters per square meter. The theoretical ink volume can only be used to simply estimate or predict the ink consumption. The correct ink consumption and ink layer thickness can only be calculated based on the full understanding of the printing medium, such as ink. Percentage of solvent/diluent: specific gravity, solids content, viscosity. There are also the screen weaving structure, the type of template, scraper hardness, side shape, pressure and angle, mesh size, screen tension, type of printing machine will also affect the ink consumption.
6 Main Characteristics of Wire Mesh Material
1 Tensile strength [g (grams) / D (diameter)] ytterbium net is 3.7-4.1g / D), nylon mesh is 4.5-5.8g / D), polyester mesh is 4.3-5.5g / D ), Stainless steel wire mesh is 1.5g/D).
2 Dry-wet strength ratio (%) 92-100% of the net, 89-90% of the nylon screen, 100% of the polyester screen, and 100% of the stainless steel screen.
3 Nodule strength [g (grams) / D (diameter)] The netting was 2.9 g/D, the nylon web was 4.5-5.4 g/D, and the polyester web was 3.4-4.4 g/D.
4 Tensile elongation (%) The net is 8-22%, the nylon screen is 26-32%, the polyester screen is 16-30%, and the stainless steel screen is 38%.
5 Dry-wet elongation ratio (%) One 134% of the net 120, 115-122% of the nylon screen, 100% of the polyester screen, and 100% of the stainless steel screen.
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