Production & Quality
4 조회수
Unreasonable die head flow channel design of polyolefin plastomer extruders
문제 현상
The flow velocity of each part of the extrudate is uneven, and the cross-sectional dimension deviation of the product is large.
The die head flow channel design directly affects the uniformity and quality of the extrudate.
원인 분석
（1）The die head flow channel distribution is unreasonable, and the flow path lengths of each part are unequal
（2）The die land length is insufficient
（3）There are dead corners in the flow channel, and the material stagnates and degrades
（4）The flow channel surface finish is insufficient
（5）The die head heating is uneven
해결 방법
（1）Optimize the flow channel design, using a coat-hanger or manifold distributor to ensure equal flow path lengths
（2）Increase the die land length to stabilize the melt flow
（3）Eliminate dead corners in the flow channel, with all corners transitioned by arcs
（4）Polish the flow channel surface to Ra≤0.2μm
（5）Optimize the die head heating ring arrangement to ensure uniform temperature
핵심 요약
The die head flow channel design needs to ensure uniform melt distribution and no stagnation, and the die head should be redesigned when necessary.
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