Injection Molding
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Insufficient weld line strength of PET injection molded parts
Problem Phenomenon
The strength at the weld line of PET injection molded products is significantly lower than the bulk, and the product breaks along the weld line in impact testing.
Cause Analysis
The two melt fronts fail to fully fuse (temperature on the low side); molecular chain orientation at the weld line is unfavorable for strength; venting is poor.
Solution
Increase melt temperature and mold temperature; increase injection speed and holding pressure; optimize gate position; improve venting at the weld line.
Key Takeaway
PET weld line strength needs to be comprehensively improved through temperature, pressure and gate layout.
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