Extrusion & Post
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Uneven surface of methyl styrene-acrylonitrile copolymer extruded pipes
Fenómeno del problema
Uneven surface appears on extruded pipes, affecting product appearance and subsequent processing quality.
This problem is common in methyl styrene-acrylonitrile copolymer extrusion production.
Análisis de la causa
(1) Improper extrusion temperature (220-280°C) setting, unstable melt quality
(2) Improper matching of screw rotation speed and haul-off speed
(3) Die condition or design problems
(4) Improper cooling system settings
(5) Raw material quality or pretreatment problems
Solución
(1) Optimize extrusion temperature to a reasonable value within the 220-280°C range
(2) Stabilize screw rotation speed and haul-off speed
(3) Check die condition, clean accumulated material or repair damage
(4) Adjust cooling water temperature and flow
(5) Ensure raw material is dried (80-90°C, 2-4h) and clean
Conclusión clave
Extrusion surface defects need to be controlled from three aspects: temperature, speed, and die condition.
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