Material Drying
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TPE overmolding bubbles
Problem Phenomenon
Bubbles at the TPE overmolding interface
Cause Analysis
Moisture or air retention at the interface; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry materials and should be confirmed first during troubleshooting
Solution
Dry the overmolding material and the hard plastic; interface venting; injection speed optimization; 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, so as to locate effective measures
Key Takeaway
For overmolding bubbles check moisture and venting; 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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