Extrusion & Post
10 조회수
Rough inner wall of EVA extruded pipe
문제 현상
EVA extruded pipe inner wall roughness Ra>10μm affects fluid conveying efficiency
원인 분석
Mandrel surface rough or worn; insufficient internal cooling causing inner wall melt not fully sized; EVA melt elasticity causing uneven extrusion swell on inner wall
해결 방법
1) Polish mandrel to Ra<0.4μm; 2) Optimize internal cooling system with cooling water through mandrel; 3) Reduce extrusion rate to reduce elastic recovery influence; 4) Add small amount of low-elasticity resin to improve inner wall smoothness
핵심 요약
Pipe inner wall roughness is caused by mandrel condition and insufficient cooling; polishing mandrel and internal cooling are key
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