Production & Quality
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Unreasonable Die Head Flow Channel Design of Polypropylene Extruder
Fenómeno del problema
The flow speed of various parts 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.
Análisis de la causa
(1) The die head flow channel distribution is unreasonable, and the flow path lengths of various parts are unequal
(2) The die land length is insufficient
(3) There are dead corners in the flow channel, and the material is retained and degraded
(4) The surface finish of the flow channel is insufficient
(5) The die head heating is uneven
Solución
(1) Optimize the flow channel design, using a coat-hanger or manifold distributor to ensure equal lengths of all flow paths
(2) Increase the die land length to stabilize the melt flow
(3) Eliminate dead corners in the flow channel, and use arc transitions at all corners
(4) Polish the flow channel surface to Ra≤0.2μm
(5) Optimize the arrangement of the die head heating bands to ensure uniform temperature
Conclusión clave
The die head flow channel design needs to ensure uniform melt distribution and no material retention; the die head needs to be redesigned when necessary.
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