Processing Machinery
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Poor PVA plasticization
Problem Phenomenon
PVA product shows unmelted particles, incomplete plasticization
Cause Analysis
Screw compression ratio insufficient <2.5, low plasticizing pressure; screw speed on the low side, insufficient shear; processing temperature on the low side
Solution
1) Select a screw with compression ratio >3; 2) Increase screw speed to increase shear; 3) Raise processing temperature by 5-10°C
Key Takeaway
Poor plasticization is caused by improper screw design; optimizing the screw and raising temperature are the key
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