Extrusion & Post
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PVDF Extrusion Shrinkage and Retraction and Cooling Water Temperature
Problem Phenomenon
【Problem phenomenon】PVDF extruded products show large shrinkage and retraction after cooling, unstable dimensions, and drifting cut lengths
Cause Analysis
Crystallization cooling shrinkage continues, and cold water quick-freezing of the surface layer out of sync with internal shrinkage aggravates retraction; the Arkema cable bulletin recommends 32-43℃ warm cooling water to reduce extrudate shrinkage and retraction
Solution
Change the cooling water tank to 32-43℃ warm water gradient cooling; match haul-off speed with extrusion speed to prevent stretch orientation; leave sufficient cooling length on the downstream path before cutting; After adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Warm water cooling is the key to preventing PVDF retraction; rapid cooling instead amplifies dimensional drift; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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