Production & Quality
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Unreasonable die head flow channel design of heat-resistant polyethylene extruder
Problem Phenomenon
The flow velocity of the extrudate is uneven at various parts, and the cross-sectional dimensional deviation of the product is large.
Die head flow channel design directly affects the uniformity and quality of the extrudate.
Cause Analysis
(1) Unreasonable die head flow channel distribution, unequal flow path lengths at various parts
(2) Die sizing section length insufficient
(3) Dead corners in flow channel, material stagnates and degrades
(4) Flow channel surface finish insufficient
(5) Die head heating uneven
Solution
(1) Optimize flow channel design, use coat-hanger or manifold distributors to ensure equal flow path lengths
(2) Increase die sizing section length to stabilize melt flow
(3) Eliminate flow channel dead corners, all corners transition with arcs
(4) Polish flow channel surface to Ra≤0.2μm
(5) Optimize die head heating ring layout to ensure uniform temperature
Key Takeaway
Die head flow channel design needs to ensure uniform melt distribution and no material stagnation, and the die head should be redesigned when necessary.
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