The selection of screens is a very important and crucial step in the screen printing process. However, there are currently many domestic screen production enterprises with messy products. How to choose the most suitable and best quality screen from the existing products has become One of the concerns of buyers, the author summarizes the selection skills of wire mesh based on the public experience and statements.
1. When selecting the screen, the type of screen can be determined according to the accuracy of the original, the shape of the substrate and the basic requirements for printing. Generally, the wire mesh is divided into four types according to its material, namely silk wire, nylon wire mesh, polyester wire mesh and stainless steel wire mesh. In the selection, you can make the correct selection according to the requirements.
2. When choosing a wire mesh, first pay attention to observe whether the number of warps and wefts are consistent, and also need to have a comparable or the same pressure curve. Generally, a wire mesh with inconsistent warp and weft threads or inconsistent warp and weft pressure curves is called an unbalanced wire mesh. Such products are likely to cause problems such as moire and overprinting in the printing process.
3. Should choose the appropriate screen mesh
Generally, when selecting a wire mesh, the finer the wire diameter and the higher the wire number, the greater the tensile force that can be satisfied, and the more ideal the wire mesh. Whether the screen mesh selected in the printing process is appropriate will directly determine the quality of printing. Generally, the larger the screen mesh, the finer the screen and the finer the mesh. However, in screen printing, It is not as fine as possible, but depends on the printing job, manuscript and ink type used to determine which mesh screen to choose. (Note: The smaller the mesh diameter, the larger the relative opening area, so it is more suitable for fine-level replication; the finer the mesh, the worse the corrosion resistance of the corrosive cleaning agent. The abrasion resistance of the squeegee is also worse; the larger the mesh diameter, the smaller the relative opening area, and it is more difficult to reproduce the thin lines and small dots; the larger the mesh diameter, the printing resistance of the screen The higher.)
4. A good screen must also have enough area to support the necessary gray levels and clean ink transfer.
5. When selecting the wire mesh, you should pay attention to see if it has data range parameters, such as the wire mesh diameter change range data, the number of warp and weft wire mesh, pressure curve and fabric thickness, etc. Most manufacturers need to provide this set of data, if not, they need to ask why.
6. The selection of color mesh should take into account the exposure speed. Generally, the exposure speed of white mesh fabric is faster than that of yellow mesh fabric, but the white silk thread is easy to cause the problem of unclear outline, and yellow mesh fabric can be a great extent To reduce this problem, these two gaps will be more obvious when printing halftone images and thin lines, so this item needs to be taken into account when selecting a screen.
7. In general, in addition to considering the above factors, the selection of screen should also take into account factors such as the adaptability of the ink, the surface of the substrate, the service life of the template, and the production cost. Only after comprehensive consideration can the proper screen be selected correctly, which will help to achieve the best printing effect and economic benefits.
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