Processing Machinery
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EVA poor plasticization
Problem Phenomenon
Unmelted particles appear in EVA products with incomplete plasticization
Cause Analysis
Insufficient screw compression ratio <2.5 with low plasticizing pressure; screw rotation speed too low with insufficient shear; processing temperature too low
Solution
1) Select a screw with compression ratio >3; 2) Increase screw rotation speed to increase shear; 3) Increase processing temperature by 5-10°C
Key Takeaway
Poor plasticization is caused by improper screw design; optimizing the screw and increasing temperature are key
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