Material Drying
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Rough inner and outer walls of heat-resistant polyethylene pipes
Problem Phenomenon
The inner or outer wall surface of the pipe is rough, with visible streaks or particles.
Pipe wall roughness increases fluid resistance and affects conveying efficiency, and may affect hygienic performance in water supply pipes.
Cause Analysis
(1) Die or mandrel temperature too low, melt surface rough
(2) Die or mandrel surface finish insufficient
(3) Sizing sleeve worn or surface rough
(4) Melt temperature too low, poor fluidity
(5) Compressed air with high water content affects the inner wall
Solution
(1) Appropriately increase die and mandrel temperature to the higher value within 190-230°C
(2) Polish die and mandrel to Ra≤0.2μm, chrome plating treatment
(3) Check the sizing sleeve, replace if worn or rough
(4) Appropriately increase barrel temperature to a reasonable value within 190-230°C
(5) Add drying and filtering device to compressed air
Key Takeaway
Pipe wall roughness is caused by low mold temperature or poor surface condition, and needs to be solved from temperature control and mold maintenance.
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