Injection Molding
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Shrinkage marks in EAA '2079851475616104452
Problem Phenomenon
The surface of thick-walled areas of EAA injection molded products has depressions of 0.2-0.5mm, shrinkage marks
Cause Analysis
Insufficient holding pressure or short holding time; the gate freezes prematurely, holding pressure cannot be transmitted; large wall thickness differences, after the thin wall freezes, the thick wall cannot be fed
Solution
1) Increase the holding pressure to 70-90MPa; 2) Extend the holding to gate freezing +2s; 3) Design the product to reduce wall thickness differences with gradual transitions; 4) Add supplementary gates in thick-walled areas
Key Takeaway
Shrinkage is caused by insufficient holding pressure and wall thickness differences; high-pressure holding and multiple gates are the core countermeasures
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