Injection Molding
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PETG '2079851475616104452 gate area sink mark
Problem Phenomenon
Sink marks (shrinkage) appear near the gate of PETG products, affecting appearance and dimensions.
Cause Analysis
Insufficient holding pressure and inadequate feeding at the gate, the gate solidifies too early cutting off the feeding channel, and this area is locally overheated with large cooling shrinkage.
Solution
Increase holding pressure and extend holding time; enlarge the gate to delay solidification; ensure the holding switchover point is accurate.
Key Takeaway
PETG gate sink marks are related to holding pressure transmission efficiency.
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