Injection Molding
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Cold slug marks in PU '2079851475616104452
Problem Phenomenon
Cold slug marks appear near the gate of PU injection molded products
Cause Analysis
Nozzle temperature too low, causing residual material from the previous injection to cool and solidify in the nozzle; cold slug well design insufficient to hold cold material; injection pressure insufficient
Solution
1) Increase nozzle temperature to 60-120°C; 2) Design a sufficiently large cold slug well in the mold; 3) Ensure fresh melt at the nozzle front before each injection; 4) Increase injection pressure to push cold material through the gate
Key Takeaway
Cold slug marks are caused by solidified residual material in the nozzle; increasing nozzle temperature and cold slug well design are key
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