Injection Molding
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PETG '2079851475616104452 poor venting, burning
Problem Phenomenon
Burnt black spots appear at the end or thin-wall areas of PETG injection molded products.
Cause Analysis
Poor cavity venting, air is compressed and heated scorching the material, injection speed too fast and air has no time to escape.
Solution
Deepen the vent groove depth to 0.02-0.03mm; reduce injection speed; add parting line venting; use vacuum venting.
Key Takeaway
PETG burning is caused by air retention; improving venting is the most direct measure.
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