Common Issues with Silicone Extruders
Time：
2025-07-16
The operating principle of a silicone extruder is to use mechanical force to process solid silicone raw material into continuous products of specified shapes. The core processes include plasticization, conveying, and shaping of the raw material.
Silicone extruders may encounter various issues during operation. Below are some common problems along with brief explanations:
Extrusion output is unstable.
- Possible causes: uneven raw material supply (e.g., inconsistent silica gel particle size, blockage at the feed port); wear of the screw or barrel, resulting in increased clearance; improper temperature control, which affects the flowability of the silicone rubber.
- Solution: Inspect the raw material condition to ensure uniform feeding; perform regular maintenance on the screw and barrel, replacing them as necessary; calibrate the temperature control system to maintain stable temperatures across all zones.
The product surface is not smooth.
- Possible causes: impurities in the raw material; insufficient surface finish or damage to the extrusion die; excessively high temperature leading to silicone decomposition, or excessively low temperature resulting in inadequate plasticization.
- Solution approach: Screen the raw materials to remove impurities; polish or replace the mold; adjust the extrusion temperature to an appropriate range.
Bubbles appear in the product.
- Possible causes: the silicone raw material is damp and contains moisture; inadequate venting during extrusion; excessively high temperatures causing the raw material to decompose and release gases.
- Solution: Dry the raw materials; inspect the venting system to ensure unobstructed airflow; and set the extrusion temperature appropriately.
Mold blockage
- Possible causes: Hard impurities in the raw material have become lodged in the mold; the silicone has cured inside the mold (due to excessive temperature or prolonged residence time); or the mold design is suboptimal, with narrow runners that promote material buildup.
- Solution approach: enhance raw material filtration; control mold temperature and material flow rate; optimize the mold runner design.
These issues are largely related to raw materials, equipment condition, and process parameters. In daily operations, it is essential to perform thorough raw material pretreatment, maintain equipment, and monitor process parameters to minimize the occurrence of malfunctions.
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Shuangda
Hebei Shuangda Rubber Machinery Co., Ltd.
Tel：400-0319-386
Landline：+86-319-6017632
Email：shuangdaxiangsu@126.com
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