Injection Molding
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PP Injection Multi-cavity Imbalance
Problem Phenomenon
Inter-cavity weight differences of multi-cavity PP parts exceed tolerance.
Cause Analysis
Unbalanced runners and cooling efficiency differences; PP is pressure-sensitive, so inter-cavity differences amplify into weight and dimensional differences.
Solution
①Geometric runner balancing; ②measure filling with the short shot method; ③balance water circuits; ④if necessary, independent valve gate control.
Key Takeaway
For multi-cavity imbalance, first measure filling balance.
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