Extrusion & Post
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PVA screw slipping
Problem Phenomenon
During PVA extrusion, the screw slips, feed does not advance, output drops sharply
Cause Analysis
PVA pellets melt too early in the feed section forming a lubricating film causing screw slip; feed section temperature too high
Solution
1) Lower feed section temperature by 10-15°C to delay melting; 2) Deepen the feed section flight to increase material gripping force; 3) Dry the pellet surface to reduce lubrication
Key Takeaway
Screw slipping is caused by premature melting; lowering the feed section temperature is the key
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