Extrusion & Post
12 조회수
Random copolymer polypropylene pipe special material (Nordic standard） pipe ovality exceeding standard（Variant: Strengthened Measures）
문제 현상
The pipe cross-section is not round, and the ovality exceeds the tolerance.
Excessive ovality affects pipe connection and installation, and may cause leakage in socket connections and mechanical connections.In particular, extra attention is needed on top of the original basis, this problem is more prominent and requires key attention.
원인 분석
（1）Cooling is uneven, and the pipe shrinks inconsistently in all directions\
（2）The sizing sleeve is worn or improperly installed\
（3）The haul-off machine clamping force is too large, causing pipe deformation\
（4）Improper pipe stacking causes deformation\
（5）Cooling water temperature too high causes the pipe to soften and deform\
（6）On top of the original basis, extra attention is needed: process parameter fluctuations or equipment status changes aggravate this problem
해결 방법
（1）Check the cooling system, ensure uniform cooling in all directions of the pipe\
（2）Check the sizing sleeve, replace if worn, ensure concentric installation\
（3）Adjust the haul-off machine clamping force, avoid excessive force\
（4）Use dedicated storage racks for pipes, avoid stacking deformation\
（5）Control the cooling water temperature at 15-25°C\
（6）And strengthen process monitoring; on top of the original basis, extra attention is needed, paying special attention to parameter stability
핵심 요약
Excessive ovality is caused by uneven cooling or external force deformation, and needs to be solved from cooling uniformity and pipe storage.Targeted preventive measures need to be taken in different production scenarios.
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