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What are the solutions for uneven foaming and internal voids in rigid PVC sheets?

Category: Industry News

Release Date: 2026-03-17

Summary: Uneven foaming: Adjust the dosage and dispersion of the blowing agent, optimize the temperature-control profile (to prevent localized overheating or underheating), and ensure uniform plasticization by the screw.

  • Uneven foaming: Adjust the dosage and dispersion of the blowing agent, optimize the temperature-control profile (to prevent localized overheating or underheating), and ensure uniform plasticization by the screw.
  • Internal bubble formation: Reduce the moisture content of raw materials (the moisture content of PVC resin powder must be ≤0.3%, and it should be dried in advance); ensure the vacuum venting system is unobstructed to minimize air entrainment in the raw materials.

Keywords: What are the solutions for uneven foaming and internal voids in rigid PVC sheets?

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