Molds & Tooling
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Random copolymer polypropylene extruder die head runner design unreasonable
Fenómeno del problema
The flow velocity of the extrudate at various parts is uneven, and the product cross-sectional dimension deviation is large.
The die head runner design directly affects the uniformity and quality of the extrudate.
Análisis de la causa
（1）The die head runner distribution is unreasonable, the flow path lengths at various parts are unequal\
（2）The die land length is insufficient\
（3）The runner has dead corners, material stagnates and degrades\
（4）The runner surface finish is insufficient\
（5）The die head heating is uneven
Solución
（1）Optimize the runner design, adopt a coat-hanger type or manifold type distributor to ensure equal flow path lengths\
（2）Increase the die land length, stabilize melt flow\
（3）Eliminate runner dead corners, use arc transitions at all corners\
（4）Polish the runner surface to Ra≤0.2μm\
（5）Optimize the die head heater band layout, ensure uniform temperature
Conclusión clave
The die head runner design needs to ensure uniform melt distribution and no stagnant material; if necessary, redesign the die head.
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