During the production process of a silicone extruder, bubbles or pinholes may appear on the product surface, compromising product quality. What could be the underlying causes?
Time：
2025-12-14
During the production process of silicone extruders, bubbles or pinholes may appear on the product surface, compromising product quality. This can be attributed to excessive moisture or volatile content in the raw materials, an inadequately designed or blocked venting system, improper temperature settings, excessively high screw speeds, or defects in the mold runner design.
Core Cause Analysis:
1. The raw materials have excessive moisture or volatile content.
- Silicone raw materials have absorbed moisture due to improper storage, or have not been adequately dried.
2. The exhaust system is improperly designed or blocked.
- The barrel vent is blocked, preventing gas from escaping.
3. Improper temperature setting
- An excessively high barrel temperature can cause premature crosslinking of the silicone rubber, while an excessively low temperature can result in inadequate plasticization.
4. Screw speed is too high
- Excessive shear force entrains air.
5. Mold Runner Design Defects
- Dead corners in the flow path cause gas entrapment.
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Shuangda
Hebei Shuangda Rubber Machinery Co., Ltd.
Tel：400-0319-386
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