Injection Molding
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EVOH injection mold venting burnt
Problem Phenomenon
EVOH injection mold venting insufficient, air in the cavity compressed and heated, causing local burning
Cause Analysis
Insufficient vent groove area or improper position; injection speed too fast with air unable to escape in time; 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 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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