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