Injection Molding
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DSTDP injection cold slug marks
Problem Phenomenon
DSTDP injection molded product shows cold slug marks near the gate
Cause Analysis
Nozzle temperature on the low side causing residual material from the previous injection to cool and solidify in the nozzle; cold slug well design insufficient to accommodate cold material; injection pressure insufficient
Solution
1) Raise nozzle temperature to 160-200°C; 2) mold design with a sufficiently large cold slug well; 3) ensure fresh melt at the nozzle front before each injection; 4) raise injection pressure to push cold material through the gate
Key Takeaway
Cold slug marks are caused by solidified residual material in the nozzle; raising nozzle temperature and cold slug well design are key
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