Molds & Tooling
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PVC Dimensional Instability
Problem Phenomenon
PVC product dimensions fluctuate between batches
Cause Analysis
Mold temperature and holding pressure fluctuate; although PVC shrinkage is small, it is sensitive to process; 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
Lock mold temperature and holding pressure; SPC monitoring of key dimensions; full-dimension first piece; 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
Dimensional consistency relies on process locking plus SPC; 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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