Injection Molding
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Burnt due to mold venting in PVA '2079851475616104452
Problem Phenomenon
In PVA '2079851475616104452, mold venting insufficient, air in the cavity is compressed and heated, causing local burning
Cause Analysis
Mold vent groove area insufficient or position improper; injection speed too fast, air has no time to escape; air 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-filled area of the melt; 3) Reduce injection speed to reduce air compression; 4) Multi-stage injection with slow advancement for venting
Key Takeaway
Burning is caused by insufficient venting and high-speed injection compressing air; increasing venting and reducing speed are key
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