Material Drying
12 조회수
Random copolymer polypropylene pipe special material (Nordic standard） pipe inner and outer wall roughness（Variant: Strengthened Measures）
문제 현상
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.In particular, extra attention is needed on top of the original basis, this problem is more prominent and requires key attention.
원인 분석
（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\
（6）On top of the original basis, extra attention is needed: process parameter fluctuations or equipment status changes aggravate this problem
해결 방법
（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\
（6）And strengthen process monitoring; on top of the original basis, extra attention is needed, paying special attention to parameter stability
핵심 요약
Pipe wall roughness is caused by low mold temperature or poor surface condition, and needs to be solved from temperature control and mold maintenance.Targeted preventive measures need to be taken in different production scenarios.
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