Material Drying
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Rough inner and outer walls of random copolymer polypropylene pipe special material pipes (Variant: strengthened measures)
Fenómeno del problema
The inner wall or outer wall surface of the pipe is rough, with visible stripes or particles.
Rough pipe wall increases fluid resistance and affects conveying efficiency, and may affect hygienic performance in water supply pipes.
In particular, extra attention is needed on the original basis, this problem is more prominent and needs key attention.
Análisis de la causa
（1）The die or mandrel temperature is low, and the melt surface is rough
（2）The finish of the die or mandrel surface is insufficient
（3）The sizing sleeve is worn or the surface is rough
（4）The melt temperature is low, and the flowability is poor
（5）The compressed air has a high water content, affecting the inner wall
（6）On the original basis, extra attention is needed: process parameter fluctuations or equipment status changes have aggravated this problem
Solución
（1）Appropriately raise the die and mandrel temperature to the higher value within the range of 200-220°C
（2）Polish the die and mandrel to Ra≤0.2μm, with chrome plating
（3）Check the sizing sleeve, and replace it if it is worn or rough
（4）Appropriately raise the barrel temperature to a reasonable value within the range of 200-220°C
（5）Add a drying and filtering device to the compressed air
（6）And strengthen process monitoring; on the original basis, extra attention is needed, with special attention to parameter stability
Conclusión clave
Rough pipe wall is caused by low mold temperature or poor surface condition, and needs to be solved from temperature control and mold maintenance.
In different production scenarios, targeted preventive measures need to be taken.
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