Processing Machinery
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Unreasonable die head flow channel design of random copolymer polypropylene pipe special material extruder (Variant: strengthened measures)
Fenómeno do problema
The flow speed 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.
In particular, extra attention is needed on the original basis, this problem is more prominent and needs key attention.
Análise das causas
（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 stays and degrades
（4）The finish of the flow channel surface is insufficient
（5）The die head heating is uneven
（6）On the original basis, extra attention is needed: process parameter fluctuations or equipment status changes have aggravated this problem
Solução
（1）Optimize the flow channel design, and use a coat-hanger or branch pipe distributor to ensure that each flow path is equal in length
（2）Increase the die land length to stabilize the melt flow
（3）Eliminate the dead corners of 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 heater bands to ensure uniform temperature
（6）And strengthen process monitoring; on the original basis, extra attention is needed, with special attention to parameter stability
Conclusão principal
The die head flow channel design needs to ensure uniform melt distribution and no stagnation, and the die head needs to be redesigned if necessary.
In different production scenarios, targeted preventive measures need to be taken.
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