Processing Machinery
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Insufficient PVA mixing
Problem Phenomenon
After PVA is blended with filler/additives, dispersion uneven with local agglomeration
Cause Analysis
Screw mixing section length insufficient; insufficient number of kneading blocks; improper feeding method, additives not in full contact with PVA
Solution
1) Increase screw mixing section length to 3-4D; 2) Increase the number of kneading blocks; 3) Add additives through the side feed port afterward to increase mixing time
Key Takeaway
Insufficient mixing is caused by improper screw design; increasing the mixing section is the key
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