Screen selection in the process of the hottest scr

The selection of silk in the process of silk printing

in the process of silk printing, the plate making process is the key link, and the first step of preparation for plate making is the selection of silk, which is related to the quality of the plate and production efficiency. Now let's share the selection of Xiasi

I. selection of wire mesh:

three factors need to be considered: inks used:

① general water-based inks are suitable for thicker wires (mesh/inch) (inch is the length unit, 1inch=1000mil=2.54cm=25.4mm); ② When printing advertisements and electrical appliances with solvent ink, medium mesh silk (mesh/inch) shall be selected; ③ UV ink adopts high mesh silk (mesh/inch); ④ Generally, the pigment particles of ink are relatively fine, and the ink has good trafficability. This kind of ink can also pass very well when using high mesh silk; The ink with high pigment concentration, although the particles are fine, its permeability will be relatively poor

types of substrate:

① during this holiday when the surface is rough, more than 20million people will take the subway to go out. Absorbent substrate requires more ink to achieve the best coverage rate of ink layer, so thicker silk is selected; ② The surface is smooth and non absorbable, and the concentration of ethanol cannot be lower than 99.5%, otherwise the experimental results will be affected. The substrate requires relatively less ink, so a higher mesh of silk is selected

the number of wire mesh matches the original image: the number of wire mesh selected should be sufficient to the image on the plate film, that is, to ensure that the thinnest image area has sufficient wire support. (the width of the thinnest line that can be printed from a certain number of wires is equal to the sum of the hole diameter and the wire diameter plus the expansion of about 7% when the wire is woven. (for example, for 180 mesh/inch wires, the hole diameter is 23 m, as a variety with large vanadium consumption, the rib wire diameter is 30 m, and the width of the thinnest line printed =23+30+ (23+30) 7% 57 M. It shows that this kind of wire can only be thinnest, but if there is insufficient replenishment, it cannot maintain the pressure to print 57 micron lines. There is also a formula that the thickness of the smallest point (or line) of the wire can be completely printed = 2 * (1 + mesh of the wire * diameter of the wire) mesh of the wire)

II. Selection of wire diameter: two aspects must be considered: ① tensile strength of wire. ② The fineness of the manuscript

when the mesh number is the same, the larger the wire diameter is, the stronger the tensile strength, wear resistance and corrosion resistance are. The larger the thickness is, the smaller the opening area (opening ratio) is. When the original size of the original image is twice the wire diameter, the points may fall on the wire, and the loss of points in the highlight area is heavy. When the point is 3 times the wire diameter, any part of the point can get enough support, and the dark point can also get enough opening area

III. problems that should be paid attention to when selecting silk:

uneven knitting; Uneven thickness of silk; The cost of choosing silk; Pay attention to moire:

in the case of halftone silk, the silk will also affect the moire degree of printing