Injection Molding
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Cold slug marks in EAA '2079851475616104452
Problem Phenomenon
Cold slug marks appear near the gate of EAA injection molded products
Cause Analysis
Nozzle temperature too low, residual material from the previous injection cools and solidifies in the nozzle; insufficient cold slug well design, cannot accommodate cold material; insufficient injection pressure
Solution
1) Raise the nozzle temperature to 180-240°C; 2) Design a sufficiently large cold slug well in the mold; 3) Ensure fresh melt at the front end of the nozzle before each injection; 4) Increase the injection pressure to push the cold material through the gate
Key Takeaway
Cold slug marks are caused by solidified residual material in the nozzle; raising the nozzle temperature and cold slug well design are the key
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