Screen printing silicone process operation
Control the uniform printing thickness: During the screen printing process, ensure the uniform thickness of the screen printing silicone middle layer by adjusting parameters such as the angle of the scraper, pressure, and printing speed. If the thickness is uneven, the physical properties such as the shrinkage rate of different thickness areas will be different during the subsequent curing process, which is easy to cause stratification. For example, the scraper angle is generally adjusted between 60 and 80 degrees, the pressure is appropriately adjusted according to the viscosity of the silicone and the characteristics of the substrate, and the printing speed is kept stable to avoid sudden speed changes, so as to ensure that each layer of silicone can be printed flat and evenly on the substrate.
Control of multi-layer printing interval: If multi-layer silk-screen printing is performed, the time interval between each layer of printing should be reasonably controlled. Printing the next layer when the previous layer of silicone is not fully cured is conducive to better fusion and combination between the two layers and enhance the adhesion between the layers. However, the interval time should not be too short to avoid the two layers from penetrating each other due to the lack of initial shaping, which affects the appearance and performance. The appropriate interval time needs to be determined through experiments. For example, some silicone may have a better effect of printing the next layer after an interval of about 5 to 10 minutes.