Molds & Tooling
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PVDF Mold Temperature Affects Crystallinity and Performance
Fenómeno do problema
【Problem phenomenon】PVDF products of the same material molded at different mold temperatures show obvious differences in strength and chemical resistance, and low mold temperature parts are brittle
Análise das causas
PVDF is a semi-crystalline material with 50-60% crystallinity, and mold temperature directly determines the degree of crystallization perfection: low mold temperature results in insufficient crystallization and decreased strength and chemical resistance, while a high mold temperature of 80-95℃ promotes full crystallization and improves overall performance
Solução
Set the mold temperature at 80-95℃ (or the upper limit of the resin supplier's 50-90℃ range) to promote crystallization; control the temperature difference at each point of the cavity uniformly; use high mold temperature as the default for performance-sensitive parts and verify crystallinity
Conclusão principal
Mold temperature is the switch for PVDF crystallinity; for performance parts, taking the upper limit of 80-95℃ is safer; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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