Processing Machinery
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Unreasonable die head flow channel design of heat-resistant polyethylene extruder (Variant: mass production scenario)
Fenómeno del problema
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.
Especially in continuous mass production, this problem is more prominent and requires key attention.
Análisis de la causa
(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
(6) In continuous mass production, process parameter fluctuations or equipment state changes aggravate this problem
Solución
(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
(6) And establish standardized work instructions, paying special attention to parameter stability in continuous mass production
Conclusión clave
Die head flow channel design needs to ensure uniform melt distribution and no material 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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