Extrusion & Post
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EEA Surface Snakeskin Pattern
Problem Phenomenon
Snakeskin-like irregular texture on the surface of EEA extruded products
Cause Analysis
Extrusion temperature low, melt elastic recovery uneven; die temperature distribution uneven
Solution
1) Increase extrusion temperature to the processing temperature range; 2) Uniformize die temperature within ±2°C; 3) Reduce extrusion rate to reduce 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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