Processing Machinery
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Unreasonable die head flow channel design of polyolefin plastomer extruders (Variant: Enhanced Measures)
Problembeschreibung
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.
In particular, additional attention is needed on the original basis; this problem is more prominent and requires focused attention.
Ursachenanalyse
（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
（6）On the original basis, additional attention is needed: fluctuations in process parameters or changes in equipment status have aggravated this problem
Lösung
（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
（6）And strengthen process monitoring; on the original basis, additional attention is needed to pay special attention to parameter stability
Wichtigste Erkenntnis
The die head flow channel design needs to ensure uniform melt distribution and no stagnation, and the die head should be redesigned when necessary.
Targeted preventive measures need to be taken in different production scenarios.
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