Injection Molding
3 views
EEA injection cold slug marks
Problem Phenomenon
Cold slug marks appearing near the gate of EEA injection molded products
Cause Analysis
Nozzle temperature too low causing residual material from the previous injection to cool and solidify in the nozzle; insufficient cold slug well design unable to accommodate cold material; insufficient injection pressure
Solution
1) Increase nozzle temperature to 160-210°C; 2) Mold design with a sufficiently large cold slug well; 3) Ensure fresh melt at the nozzle front end before each injection; 4) Increase injection pressure to push cold material through the gate
Key Takeaway
Cold slug marks are caused by solidified residual material in the nozzle; increasing nozzle temperature and cold slug well design are the key
Was this helpful?
0 people found this helpful
Thank you for your feedback!