Injection Molding
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Weld lines on PCTG injection products
Problem Phenomenon
Weld line marks appear at the convergence of multiple melt fronts on the product.
Cause Analysis
Low convergence temperature of two melt fronts, poor fusion, insufficient venting, improper gate position design.
Solution
Increase melt and mold temperature; improve venting; optimize gate position.
Key Takeaway
PCTG weld lines need temperature assurance and venting improvement.
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