Injection Molding
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Cold slug marks in EVA '2079851475616104452
Problem Phenomenon
Cold slug marks appear near the gate of EVA injection molded products
Cause Analysis
Nozzle temperature too low causing residual material from previous shot to cool and solidify in nozzle; cold slug well design insufficient to accommodate cold slug; injection pressure insufficient
Solution
1) Increase nozzle temperature to 140-200°C; 2) Design sufficiently large cold slug well in mold; 3) Ensure fresh melt at nozzle front before each injection; 4) Increase injection pressure to push cold slug through gate
Key Takeaway
Cold slug marks are caused by solidified residual material in nozzle; raising nozzle temperature and cold slug well design are key
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