How to ensure accurate overprinting

How to ensure accurate overprinting

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In order to ensure the fine overprinting, we must do a good job of the whole process control. Firstly, we should start from the screen printing plate. The stretching net is the key to making the printing plate. Choose the appropriate mesh and stable stretch net and flat and not twist the frame. . In the operation procedure of the stretch net, it is also standardized. The mesh clamp must be accurately and firmly clamped to the screen, the pneumatic system is activated, the rated tension value is reached step by step, and the adhesive is stabilized for more than 15 minutes. The remaining edge is cut, and the tension gauge is used for the 5-point tension measurement of the screen surface during the stretching process. At the same time, it is necessary to consider the thorough drying and final stability of the adhesive mesh after 24 hours of placement before proceeding to the next process. 

Secondly, in the printing operation process, it is necessary to control the gap (web distance) between the printing plate and the substrate in several major factors of the screen printing and the printing pressure. In the printing process, the mesh distance is controlled to be non-sticky, not The smaller the basis of the flower paste, the better (if the mesh distance is too large, the printing plate will loosen due to excessive expansion, so that the image size of the printed matter is larger than the image size of the printing plate, and in severe cases, the printing plate will be damaged, resulting in the product after the product Color can not be overprinted, directly scrapped. If the mesh distance is too small, easy to paste, paste phenomenon). The printing pressure is related to the mesh distance and the squeegee. The key component of the squeegee is the squeegee. The printing wine box can be selected with a rectangular section of squeegee. The hardness can be selected to be about 75 degrees. The length of the squeegee is more than the screen. The images each grow about 20mm and their lateral edges are kept at an appropriate distance from the inner edge of the frame. The printing process is maintained to maintain the hardness within the required range. Through the adjustment of the mesh distance and the angle of the squeegee, the printing pressure is optimal (the "printing" between the printing plate and the substrate when the printing is smeared). Finally, we must control the proper temperature and humidity of the environment to print the product.