Processing Machinery
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Rough inner wall of heat-resistant polyethylene extruded products
Fenómeno del problema
The inner wall of the pipe or profile is rough and uneven, with visible streaks or particles.
Inner wall roughness affects the fluid resistance and hygienic performance of the pipe, and may breed bacteria in water supply pipes.
Análisis de la causa
(1) Mandrel temperature too low, melt stick-slip flows on the mandrel surface
(2) Mandrel surface finish insufficient or worn
(3) Compressed air pressure insufficient (during internal pressure sizing)
(4) Melt temperature too low, poor fluidity
(5) Screw plasticization insufficient, unmelted particles in the melt
Solución
(1) Appropriately increase mandrel temperature to match die temperature (190-230°C range)
(2) Polish mandrel surface to Ra≤0.2μm, chrome plate if necessary
(3) Check the compressed air system to ensure stable pressure
(4) Appropriately increase barrel temperature to a reasonable value within 190-230°C
(5) Optimize screw design and rotation speed to ensure full plasticization
Conclusión clave
Inner wall roughness is caused by low mandrel temperature or poor surface condition, and needs to be solved from temperature control and mold maintenance.
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