Injection Molding
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CEF injection sink marks
Problem Phenomenon
The surface of the thick-walled area of the CEF injection molded part is dented 0.2-0.5mm, sink marks
Cause Analysis
The holding pressure is insufficient or the holding pressure time is short; the gate freezes too early and the holding pressure cannot be transmitted; the wall thickness difference is large, and the thick wall cannot be fed after the thin wall freezes
Solution
1) Increase the holding pressure to 70-90MPa; 2) Extend the holding pressure to gate freezing +2s; 3) Product design to reduce wall thickness differences with gradual transition; 4) Add supplementary gates in the thick-walled area
Key Takeaway
Sink marks are caused by insufficient holding pressure and wall thickness differences; high-pressure holding and multiple gates are the core countermeasures
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