Extrusion & Post
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POE toughened PP directionality obvious
Problem Phenomenon
POE/PP longitudinal-transverse impact difference 2 times
Cause Analysis
POE dispersed phase is stretched and oriented into long strips during injection instead of spheres
Solution
1) Lower injection speed to reduce orientation; 2) Mold temperature 50-60°C; 3) Multi-point gates to reduce unidirectional flow; 4) Nucleating agent to refine grains
Key Takeaway
Directionality difference is caused by POE orientation; reducing speed and multi-point gates are key
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