Injection Molding
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Sink Marks of Products Due to Insufficient Holding Pressure in PCTG '2079851475616104452
Problem Phenomenon
Depressions (sink marks) appear on the product surface, especially at the thick-walled parts.
Cause Analysis
The holding pressure or time is insufficient, the shrinkage compensation is inadequate, and the gate solidifies prematurely, cutting off the shrinkage compensation.
Solution
Increase the holding pressure and extend the holding pressure time; enlarge the gate to delay solidification; optimize the V-P switchover point.
Key Takeaway
PCTG sink marks are a common defect of insufficient holding pressure.
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