Injection Molding
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CEF injection cold slug marks
Problem Phenomenon
Cold slug marks appear near the gate of the CEF injection molded part
Cause Analysis
The nozzle temperature is low, causing the residual material of the previous injection to cool and solidify in the nozzle; the cold slug well design is insufficient to accommodate the cold slug; the injection pressure is insufficient
Solution
1) Increase the nozzle temperature to 160-220°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 slug through the gate
Key Takeaway
Cold slug marks are caused by solidified residual material in the nozzle; increasing the nozzle temperature and the cold slug well design are the key
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