Injection Molding
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Premature Gate Freezing in PBT '2079851475616104452
Problem Phenomenon
The gate solidifies before the end of holding, and the shrinkage compensation channel is cut off, causing sink marks.
Cause Analysis
The gate size is too small or the mold temperature in the gate area is too low, causing PBT to crystallize and solidify rapidly.
Solution
Increase the gate diameter to ≥50% of the product wall thickness; increase the mold temperature in the gate area; delay the holding switchover.
Key Takeaway
Premature PBT gate freezing seriously affects the shrinkage compensation effect.
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