Selection points of screens during printing and plate making
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The choice of screen in the screen printing process is very important and a very important step. However, there are many domestic wire mesh manufacturers and the products are messy. How to choose the most suitable one from the existing products, the highest quality wire mesh has become One of the concerns of the buyer, the author below summarizes the selection skills of the screen based on the experience and opinions of the public.
1. When selecting a screen, the type of screen can be determined according to the accuracy of the original, the shape of the substrate, and the basic printing requirements. Generally, the screens are mainly divided into four types according to their materials, namely, silk, nylon mesh, polyester mesh and stainless steel wire mesh. When choosing, you can choose the right one according to your requirements.
2. When selecting the screen, first pay attention to observe whether the number of latitude and longitude lines are consistent, and also need to have comparable or the same pressure curve. Generally, the screen with inconsistent latitude and longitude lines or inconsistent warp and weft pressure curve is called unbalanced screen. Such products are prone to problems such as moiré and overprinting during the printing process.
3. Should choose the appropriate mesh size
Generally, the finer the diameter of the wire when the wire mesh is selected, the higher the wire number can satisfy the larger pulling force, and the more ideal the wire mesh. Whether the mesh size selected during the printing process is appropriate will directly determine the quality of the printing. Generally, the larger the mesh size, the finer the mesh and the finer the mesh, but in screen printing, It is not as fine as possible, and it is necessary to determine which mesh is selected depending on the use of the printed job, the original, and the type of ink used. (Note: The smaller the diameter of the mesh, the larger the relative opening area, so it is more suitable for fine-level reproduction; the finer the mesh, the worse the corrosion resistance of the corrosive cleaning agent. The wear resistance of the squeegee is worse. The larger the diameter of the mesh, the smaller the relative opening area. It is difficult to copy fine lines and small dots. The larger the diameter of the mesh, the greater the resistance of the screen. The higher.)
4. A good screen must also have enough area to support the necessary gray levels and clean ink delivery.
5. When selecting the screen, you should pay attention to check whether it has data range parameters, such as screen diameter range data, warp and weft screen lines, pressure curve and fabric thickness. Most manufacturers need to provide this set of data, if not, why.
6. When choosing the color mesh, the exposure speed should be considered. Generally, the white mesh has a faster exposure speed than the yellow mesh, but the white silk is easy to cause the unclear problem. The yellow mesh can be largely To reduce this problem, the two gaps are more obvious in halftone images and thin line printing, so this should be taken into account when selecting the screen.
7. Generally speaking, in addition to considering the above factors, the selection of the screen should also consider factors such as the adaptability of the ink, the substrate of the substrate, the service life of the stencil, and the production cost. Only after comprehensive consideration can the correct screen be selected correctly, which will help to achieve the best printing results and economic benefits.