Injection Molding
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EEA injection mold venting burnt
Problem Phenomenon
Insufficient venting in EEA injection mold, air in the cavity compressed and heated causing local burnt
Cause Analysis
Insufficient vent groove area or improper position; injection speed too fast, air having no time to escape; air compressed to high temperature >200°C causing oxidative burnt
Solution
1) Increase vent groove area, depth 0.02-0.03mm, width 5-10mm; 2) Set vent grooves in the last-fill area of the melt; 3) Reduce injection speed to reduce air compression; 4) Multi-stage injection with slow advancement for venting
Key Takeaway
Burnt is caused by insufficient venting and high-speed injection compressing air; increasing venting and reducing speed is the key
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