Processing Machinery
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PVC Warpage
Problem Phenomenon
PVC products warp and deform after ejection
Cause Analysis
Uneven cooling and internal stress; soft PVC formulation migration also causes deformation; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Equalize cooling; optimize holding pressure; check plasticizer migration for soft material; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
For PVC warpage check cooling; for soft material additionally check formulation migration; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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