Extrusion & Post
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EAA screw slipping
Problem Phenomenon
Screw slipping during EAA extrusion, feed not advancing, output dropping sharply
Cause Analysis
EAA granules melting too early in the feeding section forming a lubricating film causing screw slipping; feeding section temperature too high
Solution
1) Reduce feeding section temperature by 10-15°C to delay melting; 2) Deepen feeding section flights to increase material gripping force; 3) Dry granule surfaces to reduce lubrication
Key Takeaway
Screw slipping is caused by premature melting; lowering the feeding section temperature is key
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