Extrusion & Post
10 조회수
Material overflow at PU vacuum section
문제 현상
Material overflows at the vacuum section in PU extrusion, vent hole clogged
원인 분석
PU melt viscosity low, overflowing at vacuum section; vacuum section temperature too high, viscosity even lower, aggravating overflow; vent hole design improper
해결 방법
1) Lower vacuum section temperature by 5-10°C to increase viscosity; 2) Add baffle above the vent hole to prevent overflow; 3) Increase screw speed to accelerate conveying and reduce residence
핵심 요약
Overflow is caused by low melt viscosity; temperature reduction and baffle are key
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