Molds & Tooling
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PC Gate Blush (Gate Mark)
Problem Phenomenon
A ring-shaped haze or whitening area appears around the gate, especially glaring on transparent parts, affecting appearance consistency.
Cause Analysis
The melt enters the cavity through the small gate under high shear, and local shear stress and temperature fluctuations cause gloss/transparency differences near the gate; an improper holding pressure switchover point also forms a sudden pressure change in the gate area, leaving a halo.
Solution
①Reduce the injection speed when passing through the gate (pass the gate at low speed and then speed up); ②Appropriately enlarge the gate to disperse shear; ③Appropriately increase the mold temperature to improve the melt's replication and fit to the cavity surface; ④Optimize the holding pressure switchover point to avoid sudden pressure changes; ⑤Check the temperature control uniformity of the hot runner gate.
Key Takeaway
PC gate blush is solved by 'enter slowly, flow fast': lower the speed through the gate, enlarge the gate, and then stabilize the holding pressure switchover; the gate area of transparent parts is where shear is most concentrated and needs key care.
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