Extrusion & Post
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Surface Pockmarks of ABS-Type Variant Extruded Profile
Problem Phenomenon
Pockmarks appear on the surface of the extruded profile, affecting product appearance and subsequent processing quality.
This problem is common in ABS-type variant extrusion production.
Cause Analysis
(1) The extrusion temperature (220-260°C) is set improperly, and the melt quality is unstable
(2) The screw speed and 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 range of 220-260°C
(2) Stabilize the screw speed and haul-off speed
(3) Check the die condition, clean the accumulated material or repair damage
(4) Adjust the cooling water temperature and flow
(5) Ensure the raw material is dry (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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