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Common Quality Issues and Solutions

Category: Industry News

Release Date: 2026-03-17

Summary: Rough outer surface of the pipe Causes: improper temperature, insufficient cooling, material buildup in the die Remedies: reduce die head temperature, set cooling water temperature to 20–25°C, and clean the die

  • Rough outer surface of the pipe
    Causes: improper temperature, insufficient cooling, and material buildup in the mold.
    Remedial measures: reduce the die temperature, set the cooling water temperature to 20–25°C, and clean the mold.
  • Rough inner wall / Bubbles
    Cause: Moisture in the raw material, poor plasticization
    Treatment: Dry the raw material at 60–90°C and increase the screw speed/temperature.
  • Outer diameter variation / Ellipticity
    Causes: unstable traction, insufficient vacuum, and uneven cooling.
    Processing: synchronous traction and extrusion, vacuum inspection, and uniform spraying
  • Pipe corrugation
    Cause: Traction too fast / too slow
    Treatment: Fine-tune the traction speed to match the extrusion.

Keywords: Common Quality Issues and Solutions

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Previous: How can raw material degradation, yellowing, and black spots be prevented during PVC sheet production?

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