Extrusion & Post
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PVA surface snakeskin pattern
Fenómeno del problema
PVA extruded product surface has snakeskin-like irregular texture
Análisis de la causa
Extrusion temperature on the low side, uneven melt elastic recovery; uneven die temperature distribution
Solución
1) Raise extrusion temperature to the processing temperature range; 2) Homogenize die temperature ±2°C; 3) Reduce extrusion rate to reduce elastic recovery
Conclusión clave
Snakeskin pattern is caused by low-temperature extrusion and elastic recovery; raising temperature and reducing speed are the key
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