Production & Quality
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Unreasonable head flow channel design of linear low-density polyethylene extruder
Problem Phenomenon
The flow velocity of various parts of the extrudate is uneven, and the product cross-sectional dimension deviation is large.
Head flow channel design directly affects the uniformity and quality of the extrudate.
Cause Analysis
(1) Unreasonable head flow channel distribution; flow path lengths of various parts are unequal
(2) Insufficient die land length
(3) Dead zones exist in the flow channel, where material stagnates and degrades
(4) Flow channel surface finish is insufficient
(5) Head heating is uneven
Solution
(1) Optimize flow channel design, using coat-hanger or manifold distributors to ensure equal flow path lengths
(2) Increase the die land length to stabilize melt flow
(3) Eliminate flow channel dead zones; all corners use arc transitions
(4) Polish the flow channel surface to Ra≤0.2μm
(5) Optimize the head heating band layout to ensure uniform temperature
Key Takeaway
Head flow channel design needs to ensure uniform melt distribution and no stagnation; redesign the head if necessary.
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