Material Drying
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Extruded product outer surface rough and dull
Problem Phenomenon
Extruded product outer surface rough and dull, poor feel, significantly different from smooth standard samples
Cause Analysis
Extrusion temperature low, melt fluidity insufficient
Die lip surface rough
Insufficient cooling and sizing
Screw speed too fast, uneven shear
Raw material contains moisture or degraded
Solution
Appropriately increase the extrusion temperature to the higher value of 170-230°C
Polish the die lip surface
Strengthen cooling and sizing
Appropriately reduce the screw speed
Fully dry the raw material to avoid degradation
Key Takeaway
Rough extrusion surface requires increasing temperature and improving the die lip
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