Injection Molding
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Burnt marks due to poor venting in EAA injection mold
Problem Phenomenon
Insufficient venting of the EAA injection mold, air in the cavity is compressed and heated, causing local burning
Cause Analysis
Insufficient vent groove area or improper location; injection speed too fast, air has no time to escape; air compressed to high temperature >200°C causes oxidative burning
Solution
1) Increase the vent groove area, depth 0.02-0.03mm, width 5-10mm; 2) Set vent grooves in the last-filled area of the melt; 3) Reduce the injection speed to reduce air compression; 4) Use multi-stage injection with slow advance for venting
Key Takeaway
Burning is caused by insufficient venting and air compression from high-speed injection; increasing venting and reducing speed are the key
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