Injection Molding
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Gate Blush in PCTG '2079851475616104452
Problem Phenomenon
Ring-shaped marks or color differences appear around the product gate.
Cause Analysis
The melt flow at the gate is unstable (jetting effect), the gate size does not match the injection speed, and the venting is poor.
Solution
Optimize the gate design, enlarge it or change to a fan type; use multi-stage injection to control the gate speed; improve the venting.
Key Takeaway
PCTG gate blush is a manifestation of unstable mold filling flow.
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