Processing Machinery
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PVC Weld Line
Problem Phenomenon
PVC products have obvious weld lines with weak strength
Cause Analysis
Insufficient convergence temperature of the two melt fronts; PVC's poor flowability makes weld lines weaker; 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
Take upper limits of melt temperature and mold temperature; overflow well at the weld line; optimize gate position; 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
PVC weld lines are strengthened by temperature and overflow; 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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