Injection Molding
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Burning due to poor venting in PCTG '2079851475616104452
Problem Phenomenon
Burnt black spots appear at the product end or thin-wall areas.
Cause Analysis
Insufficient cavity venting; air compressed and heated burns the material, injection speed too fast.
Solution
Deepen and widen vent grooves; reduce injection speed; increase parting line venting.
Key Takeaway
PCTG burning originates from poor venting.
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