Injection Molding
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Burnt Marks from Mold Venting in CMC '2079851475616104452
Problem Phenomenon
In CMC '2079851475616104452, insufficient mold venting causes air in the cavity to be compressed and heated, resulting in local burning
Cause Analysis
The mold vent groove area is insufficient or the position is improper; injection speed is too fast and air has no time to escape; air is compressed to high temperature >200°C causing oxidative burning
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 advance for venting
Key Takeaway
Burning is caused by insufficient venting and air compressed by high-speed injection; increasing venting and reducing speed are the key
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