Material Drying
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Rough Inner and Outer Walls of Polypropylene Pipe
Fenómeno do problema
The surface of the inner or outer wall of the pipe is rough, with visible streaks or particles.
Rough pipe walls increase fluid resistance and affect conveying efficiency, and may affect hygiene performance in water supply pipes.
Análise das causas
(1) The die or mandrel temperature is too low, and the melt surface is rough
(2) The surface finish of the die or mandrel is insufficient
(3) The sizing sleeve is worn or the surface is rough
(4) The melt temperature is too low, and the fluidity is poor
(5) The compressed air has a high water content, affecting the inner wall
Solução
(1) Appropriately increase the die and mandrel temperatures to the higher value within the range of 200-280°C
(2) Polish the die and mandrel to Ra≤0.2μm, with chrome plating treatment
(3) Check the sizing sleeve; replace it if it is worn or rough
(4) Appropriately increase the barrel temperature to a reasonable value within the range of 200-280°C
(5) Add a drying and filtering device to the compressed air
Conclusão principal
Rough pipe walls are caused by low mold temperature or poor surface condition, and need to be solved from temperature control and mold maintenance.
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