Injection Molding
4 조회수
PETG '2079851475616104452 poor venting, burning
문제 현상
Burnt black spots appear at the end or thin-wall areas of PETG injection molded products.
원인 분석
Poor cavity venting, air is compressed and heated scorching the material, injection speed too fast and air has no time to escape.
해결 방법
Deepen the vent groove depth to 0.02-0.03mm; reduce injection speed; add parting line venting; use vacuum venting.
핵심 요약
PETG burning is caused by air retention; improving venting is the most direct measure.
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