Extrusion & Post
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Unevenness on the Surface of acrylonitrile-styrene copolymer Extruded Boards
Problem Phenomenon
Unevenness appears on the surface of the extruded boards, affecting the product appearance and subsequent processing quality.
This problem is common in acrylonitrile-styrene copolymer extrusion production.
Cause Analysis
（1）The extrusion temperature (200-260°C) is set improperly, and the melt quality is unstable
（2）The screw rotation speed and the haul-off speed are improperly matched
（3）Die condition or design problems
（4）The cooling system is set improperly
（5）Raw material quality or pretreatment problems
Solution
（1）Optimize the extrusion temperature to a reasonable value within the 200-260°C range
（2）Stabilize the screw rotation speed and the haul-off speed
（3）Check the die condition, clean the accumulated material or repair the damage
（4）Adjust the cooling water temperature and flow
（5）Ensure the raw material is dried (70-80°C, 3-4h) and clean
Key Takeaway
Extrusion surface defects need to be controlled from three aspects: temperature, speed, and die condition.
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