What causes silicone rubber products to bubble(Ⅲ)

What causes silicone rubber products to bubble(Ⅲ)

5. The vulcanization temperature is too high

Reason: When the molding temperature is too high, the silicone raw material on the surface has already begun to form during the mold clamping and pressurization process. At this time, the air has been trapped inside and it is difficult to discharge, so it will cause forming bubbles.

Solution: reduce the temperature during molding

6. Insufficient exhaust

Reason: After the raw material of the silicone product is placed in the forming mold, air will be brought in, and the air cannot be integrated with the raw material of the silica gel. If the air is not discharged, it will cause bubbles on the surface of the silicone product after molding.

Solution: Open the mold after the mold is closed and pressurized, so that the air in the mold can be discharged. This process is exhaust. We need to set the opening distance and opening times of the mold according to different products, which is what we often call the exhaust stroke and the number of exhausts. Usually, the exhaust stroke is generally set at 0.6~1.2cm, and the number of exhausts Generally, it is set to 1 to 3 times. There is no fixed value for the specific setting. It is necessary to repeat the test according to the structure and size of the product to achieve the best effect.

Summary: Silicone buttons produce air bubbles during molding, which will affect the appearance of the product. If air bubbles appear on some functional structures, it will affect the function and service life of silicone products. Therefore, when silicone products are molded, silicone products factories should pay attention to avoid the generation of bad bubbles in silicone products, so as not to affect the factory due to poor bubbles in silicone products.