Extrusion & Post
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Uneven surface of styrene-acrylonitrile copolymer extruded profiles
Fenómeno do problema
The extruded profile surface is uneven, affecting product appearance and subsequent processing quality.
This problem is common in styrene-acrylonitrile copolymer extrusion production.
Análise das causas
(1) Improper extrusion temperature (200-260°C) setting, with unstable melt quality
(2) Screw speed and haul-off speed are improperly matched
(3) Die condition or design problems
(4) Improper cooling system setting
(5) Raw material quality or pretreatment problems
Solução
(1) Optimize extrusion temperature to a reasonable value within the 200-260°C range
(2) Stabilize screw speed and haul-off speed
(3) Check die condition, clean material buildup or repair damage
(4) Adjust cooling water temperature and flow
(5) Ensure the raw material is dried (70-80°C, 3-4h) and clean
Conclusão principal
Extrusion surface defects need to be controlled from three aspects: temperature, speed and die condition.
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