Material Drying
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Random copolymer polypropylene pipe special material (Nordic standard） pipe inner and outer wall roughness
Fenómeno del problema
The inner or outer wall surface of the pipe is rough, with visible stripes or particles.
Rough pipe walls increase fluid resistance and affect conveying efficiency, and may affect hygienic performance in water supply pipes.
Análisis de la causa
（1）The die or mandrel temperature is too low, the melt surface is rough\
（2）The die or mandrel surface finish is insufficient\
（3）The sizing sleeve is worn or the surface is rough\
（4）Melt temperature too low, flowability poor\
（5）The compressed air moisture content is large, affecting the inner wall
Solución
（1）Appropriately increase the die and mandrel temperature to the higher value within the 200-220°C range\
（2）Polish the die and mandrel to Ra≤0.2μm, chrome plating treatment\
（3）Check the sizing sleeve, replace if worn or rough\
（4）Appropriately increase the barrel temperature to a reasonable value within the 200-220°C range\
（5）Add a drying and filtering device to the compressed air
Conclusión clave
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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