Material Drying
3 조회수
Rough inner and outer walls of low density polyethylene pipes
문제 현상
The inner or outer wall surface of the pipe is rough, with visible stripes or particles.
Rough pipe wall increases fluid resistance, affects conveying efficiency, and may affect hygienic performance in water supply pipes.
원인 분석
(1) Die or mandrel temperature too low, rough melt surface
(2) Insufficient die or mandrel surface finish
(3) Sizing sleeve worn or rough surface
(4) Melt temperature too low, poor flowability
(5) High moisture content in compressed air affecting the inner wall
해결 방법
(1) Appropriately increase die and mandrel temperature to the higher value within the 160-220°C range
(2) Polish die and mandrel to Ra≤0.2μm, chrome plating treatment
(3) Check the sizing sleeve; replace if worn or rough
(4) Appropriately increase barrel temperature to a reasonable value within the 160-220°C range
(5) Add drying and filtering devices to compressed air
핵심 요약
Rough pipe wall is caused by low mold temperature or poor surface condition; it needs to be solved from temperature control and mold maintenance.
이 정보가 도움이 되었나요?
0 명이 도움이 되었다고 합니다
의견 주셔서 감사합니다!