Extrusion & Post
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Unstable output/surging in heat-resistant polyethylene extrusion process (Variant: strengthened measures)
Fenómeno del problema
The extruder output is sometimes more and sometimes less, the extrudate is uneven in thickness, and periodic surging occurs.
Unstable output directly affects product dimensional accuracy and quality consistency.
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 feeding section conveying unstable, solid bed breaks
(2) Hopper feeding not smooth, raw material bridges
(3) Barrel temperature setting improper, feeding section temperature too high or too low
(4) Screw rotation speed fluctuates
(5) Raw material particle size uneven or too much powder contained
(6) On the original basis, additional attention is needed: process parameter fluctuations or equipment state changes aggravate this problem
Solución
(1) Optimize barrel temperature distribution, appropriately reduce feeding section temperature to prevent premature melting
(2) Install a vibrator on the hopper to prevent bridging and ensure continuous feeding
(3) Reasonably set the temperature of each barrel section to ensure it is within 190-230°C
(4) Check the extruder drive system, stabilize screw rotation speed
(5) Control raw material particle uniformity, powder proportion not exceeding 5%
(6) And strengthen process monitoring; on the original basis, additional attention is needed, paying special attention to parameter stability
Conclusión clave
Unstable output is caused by unstable solids conveying, and the barrel temperature and feeding system need to be optimized.
Targeted preventive measures need to be taken in different production scenarios.
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