Production & Quality
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PVC Transparent Sheet Gel Particles
Problem Phenomenon
Transparent PVC sheet shows gel particles and fish-eyes, affecting transparency and appearance.
Cause Analysis
Fish-eyes (unplasticized high-molecular-weight particles) in PVC resin, impurities or insufficient plasticization; more obvious when brought in by recycled material; transparent sheet magnifies any melt non-uniformity.
Solution
①Select low fish-eye resin grades; ②Increase plasticization temperature and shear, ensure full plasticization; ③Densify screen pack with reasonable gradient configuration to intercept impurities; ④Control recycled material proportion and quality; ⑤Clean retained material in equipment dead corners.
Key Takeaway
PVC transparent sheet gel particles = 'resin fish-eyes + plasticization': many fish-eyes in the resin itself and insufficient plasticization are the two sources; transparent sheet must be controlled from both resin selection and plasticization process.
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