Extrusion & Post
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Unevenness on the Surface of general purpose polystyrene Extruded Sheets
Problem Phenomenon
Unevenness appears on the surface of the extruded sheets, affecting the product appearance and subsequent processing quality.
This problem is common in general purpose polystyrene extrusion production.
Cause Analysis
（1）The extrusion temperature (180-240°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 180-240°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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