Injection Molding
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PETG injection molded product obvious weld lines
Problem Phenomenon
Obvious weld line marks or grooves appear at the melt convergence of PETG products, affecting appearance and strength.
Cause Analysis
When the two melt fronts converge, the temperature is low and fusion is poor; insufficient venting and gas hinder welding; molecular chain orientation is unfavorable for bonding.
Solution
Increase melt temperature and mold temperature; improve venting; optimize gate position; increase injection speed.
Key Takeaway
PETG weld line improvement requires the guarantee of heat and venting.
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