Injection Molding
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MP '2079851475616104452 cold slug marks
Problem Phenomenon
MP injection molded products show cold slug marks near the gate
Cause Analysis
nozzle temperature low causing previous injection residue to cool and solidify in the nozzle; cold slug well design insufficient, cannot hold the cold slug; injection pressure insufficient
Solution
1) raise nozzle temperature to 150-170°C; 2) design the mold with a sufficiently large cold slug well; 3) ensure fresh melt at the nozzle front before each injection; 4) raise injection pressure to push the cold slug through the gate
Key Takeaway
cold slug marks are caused by solidified residue in the nozzle; raising nozzle temperature and cold slug well design are key
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