Injection Molding
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HDPE Weld Line
Problem Phenomenon
HDPE injection molded part has weak strength at weld line
Cause Analysis
Two melt flows merge with weak bonding, and failure occurs along the weld line under stress; during on-site troubleshooting, verify item by item according to this mechanism to 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
Increase melt temperature and mold temperature; overflow well; position the gate away from stressed areas; 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
Weld lines are managed by both process and avoidance; after confirming effectiveness, solidify 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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