Extrusion & Post
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EVOH Surface Snakeskin Pattern
Problem Phenomenon
EVOH extruded product surfaces show snakeskin-like irregular texture
Cause Analysis
Extrusion temperature too low, melt elastic recovery uneven; die temperature distribution uneven
Solution
1) Increase extrusion temperature to the processing temperature range; 2) Homogenize die temperature ±2°C; 3) Reduce extrusion rate to decrease elastic recovery
Key Takeaway
Snakeskin pattern is caused by low-temperature extrusion and elastic recovery; raising temperature and reducing speed are key
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