Molding Process
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LDPE Film Gel Particles - Cross-linked Type
Fenómeno do problema
Arrow-shaped, V-shaped and disc-shaped cross-linked gels appear on the film surface.
Análise das causas
LDPE easily oxidizes and cross-links to form gels under high-temperature stagnation; heat preservation during shutdown and die head dead-spot stagnation are the main sources.
Solução
①Standardize shutdown (cool down or empty); ②clean die head dead spots; ③shorten residence time; ④evaluate the antioxidant system.
Conclusão principal
LDPE cross-linked gel = stagnation + oxidation.
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