Injection Molding
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DSTDP injection sink marks
Problem Phenomenon
DSTDP injection molded product thick-wall region surface depression 0.2-0.5mm, sink marks
Cause Analysis
Holding pressure insufficient or holding time short; gate freezes too early, holding pressure cannot be transmitted; wall thickness difference large, after the thin wall freezes the thick wall cannot be fed
Solution
1) Increase holding pressure 70-90MPa; 2) extend holding to gate freezing +2s; 3) product design to reduce wall thickness difference with gradual transition; 4) add supplementary gates in thick-wall regions
Key Takeaway
Sinking is caused by insufficient holding pressure and wall thickness difference; high-pressure holding and multiple gates are the core countermeasures
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