Processing Machinery
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EVA mixing is insufficient
Problem Phenomenon
After blending EVA with fillers/additives, dispersion is uneven with local agglomeration
Cause Analysis
Insufficient screw mixing section length; insufficient number of kneading blocks; improper feeding method with additives not fully contacting EVA
Solution
1) Increase screw mixing section length to 3-4D; 2) Increase the number of kneading blocks; 3) Add additives through the side feeding port afterwards to increase mixing time
Key Takeaway
Insufficient mixing is caused by improper screw design; increasing the mixing section is key
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