Molds & Tooling
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PVDF Temperature Window Differences Among Grades
Problembeschreibung
【Problem phenomenon】After switching to a different Kynar grade, continuing the original process causes insufficient filling or degradation
Ursachenanalyse
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
Lösung
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
Wichtigste Erkenntnis
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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