The importance of screen printing grid spacing
The distance of the grid distance directly affects the quality of the printing. Sometimes the effect of printing the product is not good, which may be caused by the improper spacing of the grid.
The screen printing mesh distance setting is not suitable. During the printing process, the blade pressure should be increased or decreased, which will affect the quality of printing, resulting in poor copying accuracy, blur, bubbles, ghosting, dot loss, poor edge definition, and moiré. , the pattern is not complete and so on. The network distance is not too large, and it will cause other problems. For example, the doctor blade needs to increase the squeegee pressure so that the screen can touch the substrate, but before the screen is in contact with the substrate, the ink is squeezed onto the printing surface of the screen. If this is serious, it is bound to be A printed pattern on a dirty substrate or substrate. Excessive squeegee pressure can also damage printed images, resulting in dot deformation or dot enlargement. The greater the blade pressure, the faster the rebound speed of the screen after printing, the ink can not be completely transferred to the substrate, which will lead to the appearance of moiré, incomplete pattern, drawing, bubbles, poor edge definition, etc. Printing rickets. Another cause of poor print quality is the low tension of the screen and the small mesh distance. In this case, the screen will wrinkle during the doctor blade squeegee, forming ripples on the printed matter, eventually causing severe image distortion and ghosting. The uneven thickness of the ink adhesion may be caused by the following factors: (1) the screen and the substrate are not parallel; (2) the mesh distance, the blade and the screen tension are variable; (3) the mesh distance is too large, causing the blade to deform. Any of these factors may cause uneven adhesion of the ink, and the final print may vary in color. The small mesh distance can ensure uniform ink adhesion, and the mesh distance is too large, which tends to cause uneven ink adhesion, especially at the two ends of the scraper, the ink adhesion is more uneven.
When there is a problem with printing, we have to analyze the causes of the problem in many ways to reduce the loss rate of the product.