Injection Molding
4 views
PP Injection Part Weld Line Whitening
Problem Phenomenon
Obvious whitening at weld lines of PP parts.
Cause Analysis
Low meeting front temperature; entrained gas and impurities enrich at the weld line; with poor venting the white line is more obvious.
Solution
①Raise melt and mold temperature; ②vent at the meeting point; ③set an overflow well; ④adjust the gate to change the meeting position.
Key Takeaway
White weld line = cold front + gas and impurity enrichment.
Was this helpful?
0 people found this helpful
Thank you for your feedback!