Injection Molding
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Glass Fibre '2079851475616104452 cold slug marks
Problem Phenomenon
Glass Fibre injection molded product shows cold slug marks near gate
Cause Analysis
Nozzle temperature too low causes previous shot residual material to cool and solidify in nozzle; cold slug well design insufficient, cannot accommodate cold slug; injection pressure insufficient
Solution
1) Raise nozzle temperature to 160-220°C; 2) mold design with sufficiently large cold slug well; 3) ensure fresh melt at nozzle front end before each injection; 4) raise injection pressure to push cold slug through gate
Key Takeaway
Cold slug marks are caused by solidified residual material in nozzle; raising nozzle temperature and cold slug well design are key
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