Molds & Tooling
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PVDF Temperature Window Differences Among Grades
Fenómeno do problema
【Problem phenomenon】After switching to a different Kynar grade, continuing the original process causes insufficient filling or degradation
Análise das causas
Differences in melt index and copolymer modification among grades make recommended barrel temperatures vary from 170-220℃ to 220-250℃, with mold temperature uniformly 50-90℃; the Arkema processing guide gives segment temperature tables by grade, and mixing parameters causes problems
Solução
When changing grades, first check the official temperature table and reset segment by segment; flexible grades such as SuperFlex have overall lower temperatures; verify the first piece before fixing the process card; After adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Conclusão principal
Temperature windows differ greatly among PVDF grades; check the official temperature table first when changing material; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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