Extrusion & Post
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PVDF Annealing to Eliminate Internal Stress
Problem Phenomenon
【Problem phenomenon】PVDF precision parts show dimensional drift after storage and crack during assembly, more obvious in machined parts
Cause Analysis
Internal stress introduced by molding and machining is slowly released during storage, causing dimensional changes and stress cracking; CS-Seal recommends 100℃×2h stress relief annealing for precision parts after machining, and 80-120℃ annealing for sheets and rods
Solution
Anneal precision parts at 100℃×2h after machining; anneal injection-molded sheets and rods at 80-120℃ to stabilize dimensions; cool slowly after annealing to prevent new stress; re-measure critical dimensions after annealing
Key Takeaway
Annealing is the last guarantee of dimensional stability for PVDF precision parts; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; Include this case in the defect archive as a reference for troubleshooting similar problems in the future
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