Production & Quality
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Unreasonable die head flow channel design of low density polyethylene extruder
Problem Phenomenon
Flow speed is uneven across parts of the extrudate, product cross-section dimensional deviation is large.
Die head flow channel design directly affects extrudate uniformity and quality.
Cause Analysis
(1) Unreasonable die head flow channel distribution, unequal flow path lengths in each part
(2) Insufficient die land length
(3) Dead corners in flow channels, material retention and degradation
(4) Insufficient flow channel surface finish
(5) Uneven die head heating
Solution
(1) Optimize flow channel design, adopt coat-hanger or manifold distributors to ensure equal flow path lengths
(2) Increase die land length, stabilize melt flow
(3) Eliminate flow channel dead corners, use arc transitions at all corners
(4) Polish flow channel surface to Ra≤0.2μm
(5) Optimize die head heater band arrangement, ensure uniform temperature
Key Takeaway
Die head flow channel design needs to ensure uniform melt distribution and no stagnation; redesign the die head when necessary.
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