How to solve the bubble in the production of silica gel extrusion

2. Put the empty mold into the machine and heat it for a while before operation. 5. Reasons for high vulcanization temperature: When the molding temperature is too high, the silica gel raw material on the surface has already begun to form during the process of mold clamping and pressurization, and at this time, the air has been trapped inside and it is difficult to be discharged, so it will cause molding bubbles.

The temperature will decrease during the molding process. 6. Reasons for insufficient exhaust: After the raw materials of silica gel products are put into the molding die, air will be brought in, and the air cannot be integrated with the silica gel raw materials. If the air is not exhausted, bubbles will be generated on the surface of the molded silica gel products. Solution: After clamping and pressurizing, open the mold to facilitate the air in the mold to be exhausted. This process is exhausting. We need to set the mold opening distance and mold opening times according to different products, which is what we often call exhaust stroke and exhaust times. Generally, the exhaust stroke is set at 0.6~ 1.2cm, and the exhaust times are generally set at 1~3 times. There is no fixed value for the specific setting, and it needs to be tried repeatedly according to the structure and size of the product to achieve the best effect. Summary: silicone buttons will produce bubbles during molding, which will affect the appearance of products. If bubbles appear on some functional structures, it will affect the function and service life of silicone products. Therefore, silica gel products factory should pay attention to avoid the generation of bad bubbles in silica gel products and avoid the influence of bad bubbles in silica gel products on the factory.