Molds & Tooling
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Non-uniform internal density of PU
Problem Phenomenon
Density of different parts of PU products differs by ±3%
Cause Analysis
Uneven holding pressure transmission, areas far from the gate have insufficient holding pressure and lower density; regional crystallinity differences cause different densities
Solution
1) Optimize gate design for uniform holding pressure transmission; 2) Uniform mold temperature to reduce crystallization difference; 3) Multi-point gates to improve holding pressure distribution
Key Takeaway
Non-uniform density is caused by uneven holding pressure; optimizing gate design is key
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