Extrusion & Post
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Snakeskin pattern on PU surface
Problem Phenomenon
Snakeskin-like irregular texture on the surface of PU extruded products
Cause Analysis
Extrusion temperature too low, uneven melt elastic recovery; uneven die temperature distribution
Solution
1) Increase extrusion temperature to the processing temperature range; 2) Homogenize die temperature ±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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