Injection Molding
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TPE Overmolding Preheating
Problem Phenomenon
TPE overmolded hard plastic parts have low temperature and poor interface bonding
Cause Analysis
Low temperature of hard plastic parts causes the TPE melt to quench at the interface, resulting in weak bonding force; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience; this mechanism has been repeatedly verified by industry information and should be confirmed first during troubleshooting
Solution
Preheat hard plastic parts at 60-80℃; ensure mold temperature; interface bonding test; 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
The overmolding interface temperature is the key to bonding force; 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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