Molds & Tooling
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PVC Mold Temperature Uniformity
Problem Phenomenon
PVC pipe fittings shrink inconsistently at various parts causing ovality
Cause Analysis
Uneven mold cooling causes differential shrinkage at parts, pipe fitting roundness damaged; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based solely on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Water channel homogenization design; cavity temperature difference controlled within ±3℃; pipe fitting core water channel independently controlled; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
Pipe fitting roundness guaranteed by cooling uniformity; 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 later
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