Extrusion & Post
12 مشاهدة
EVOH Screw Slippage
ظاهرة المشكلة
During EVOH extrusion, screw slips, feed does not advance, output drops sharply
تحليل الأسباب
EVOH pellets melt too early in the feed section forming a lubricating film causing screw slippage; feed section temperature too high
الحل
1) Reduce feed section temperature by 10-15°C to delay melting; 2) Deepen feed section flights to increase grip; 3) Dry pellet surfaces to reduce lubrication
الخلاصة الأساسية
Screw slippage is caused by premature melting; cooling the feed section is key
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