Extrusion & Post
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Dimensional fluctuation of heat-resistant polyethylene extruded products (Variant: strengthened measures)
Fenómeno del problema
The outer diameter, wall thickness or width of the extruded product fluctuates periodically or randomly in the longitudinal direction.
Dimensional fluctuation affects the fitting accuracy and use performance of products, and is common in pipe and profile extrusion.
Especially on the original basis, additional attention is needed, and this problem is more prominent and requires key attention.
Análisis de la causa
(1) Screw rotation speed unstable, output fluctuates
(2) Haul-off speed unstable, not matching extrusion speed
(3) Barrel temperature fluctuates greatly, melt viscosity changes
(4) Raw material feeding uneven, feeding fluctuation
(5) Cooling water temperature or flow fluctuation
(6) On the original basis, additional attention is needed: process parameter fluctuations or equipment state changes aggravate this problem
Solución
(1) Check the extruder drive system, stabilize screw rotation speed
(2) Check the haul-off machine speed control system to ensure stable haul-off speed
(3) Stabilize barrel temperature, fluctuation controlled within ±3°C (190-230°C range)
(4) Check hopper feeding to ensure continuous and uniform feeding
(5) Stabilize cooling water temperature and flow, add a constant temperature device if necessary
(6) And strengthen process monitoring; on the original basis, additional attention is needed, paying special attention to parameter stability
Conclusión clave
Dimensional fluctuation is caused by unstable extrusion or haul-off, and each process parameter needs to be systematically stabilized.
Targeted preventive measures need to be taken in different production scenarios.
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