Material Drying
2 views
Extruded pipe inner wall surface rough
Problem Phenomenon
The extruded pipe inner wall surface is rough, with longitudinal scratches or granular feel, especially obvious in transparent pipe inner walls
Cause Analysis
Mandrel surface rough or damaged
Extrusion temperature low (below the lower limit of 170-230°C), melt fluidity insufficient
Cooling too fast, inner wall not fully smoothed and sized
Screw speed too fast, uneven shear
Raw material contains moisture or impurities
Solution
Polish the mandrel surface
Appropriately increase the extrusion temperature to the higher value of 170-230°C
Adjust the cooling rate to avoid too fast sizing
Appropriately reduce the screw speed
Fully dry the raw material
Key Takeaway
Rough pipe inner wall requires improving the mandrel and temperature
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