Extrusion & Post
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PVDF Extrusion Cable Temperature Profile Setting
Problembeschreibung
【Problem phenomenon】PVDF cable extrusion has rough surface or scorch coexisting, and temperature settings trade one off against the other
Ursachenanalyse
The Arkema cable bulletin requires a 220-255℃ ascending temperature profile: 220℃ in the feed zone and the metering zone reaching the target melt temperature; raising the die to 260℃ can improve the surface but only for occasions with short in-die residence; scorch requires lowering the temperature of that zone
Lösung
Set each zone temperature according to the ascending profile and measure the actual melt temperature; when the surface is rough, cautiously raise the die to 260℃ and confirm short residence time; at signs of scorch, immediately lower the die head and adapter temperature
Wichtigste Erkenntnis
Cable extrusion uses an ascending temperature profile; raising the die to 260℃ for gloss must be premised on short residence; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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