Extrusion & Post
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Uneven surface of high impact polystyrene extruded profiles
Problem Phenomenon
Uneven surface appears on extruded profiles, affecting product appearance and subsequent processing quality.
This problem is common in high impact polystyrene extrusion production.
Cause Analysis
(1) Improper extrusion temperature (180-240°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
Solution
(1) Optimize extrusion temperature to a reasonable value within the 180-240°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 (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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