Injection Molding
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DSTDP injection mold venting burning
Problem Phenomenon
DSTDP injection 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 melt region; 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 high-speed injection compressing air; increasing venting and reducing speed are key
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