Why do large, dull and unreflective bubbles appear on the surface of the special profiles? How can this problem be solved?

Why do large, dull and unreflective bubbles appear on the surface of the special profiles? How can this problem be solved?

The possible causes may be:
① Various raw materials used in the production of different profiles contain excessive low-molecular volatile substances, which are far beyond the standard;
② The process control during mixing and extrusion does not meet the requirements, and the volatile substances cannot be completely discharged;
④ The exhaust system of the extruder is not functioning properly.
The main solutions include:
① Strictly control the quality of raw materials. Raw materials with excessive volatile substances that seriously exceed the standard cannot be used in production. They must be fully dried before use, and ensure that raw materials and dry mixed powder materials are not affected by moisture during storage and use;
② Develop reasonable and feasible mixing process conditions and procedures and strictly implement them, allowing the volatile substances in the raw materials to be effectively discharged during the mixing process;
③ Ensure that the function of the extruder exhaust system is complete and the temperature design of the extrusion process is reasonable, so that the residual volatile substances in the materials can be further discharged during the extrusion process.
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