Extrusion & Post
11 조회수
Random copolymer polypropylene pipe special material (Nordic standard） extruded pipe uneven wall thickness（Variant: Mass Production Scenario）
문제 현상
The pipe wall thickness is uneven in the circumferential direction, showing eccentric wall phenomenon.
Uneven wall thickness affects pipe pressure resistance; under pressure the thin-wall side ruptures first, seriously affecting pipe use safety.In particular, during continuous mass production, this problem is more prominent and requires key attention.
원인 분석
（1）The die and mandrel are not concentric, the gap is uneven\
（2）Melt temperature uneven, large circumferential temperature difference at the die\
（3）The extruder output is uneven, melt pressure fluctuates\
（4）Haul-off speed unstable or the haul-off center is not concentric with the die\
（5）The pipe sizing sleeve is worn or improperly installed\
（6）In continuous mass production, process parameter fluctuations or equipment status changes aggravate this problem
해결 방법
（1）Adjust the concentricity of the die and mandrel, circumferential gap error not exceeding ±0.05mm\
（2）Check the die heater band distribution, ensure circumferential temperature difference does not exceed ±3°C (200-220°C range)\
（3）Check the extruder plasticization stability, ensure uniform output\
（4）Adjust the haul-off device centerline to align with the die center\
（5）Check the sizing sleeve, replace if severely worn, ensure concentric installation\
（6）And establish standardized work instructions, paying special attention to parameter stability in continuous mass production
핵심 요약
Uneven wall thickness is caused by uneven die gap or uneven temperature, and needs to be solved from mold precision and temperature uniformity.Targeted preventive measures need to be taken in different production scenarios.
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