Extrusion & Post
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Unstable Output/Surging During High-Density Polyethylene Extrusion
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 the dimensional accuracy and quality consistency of the product.
Análisis de la causa
（1）The conveying of the screw feeding section is unstable, and the solid bed breaks
（2）The hopper discharge is not smooth, and the raw material bridges
（3）The barrel temperature is set improperly, and the feeding section temperature is too high or too low
（4）The screw rotation speed fluctuates
（5）The raw material particle size is uneven or contains too much powder
Solución
（1）Optimize the barrel temperature distribution, and appropriately reduce the feeding section temperature to prevent premature melting
（2）Install a vibrator on the hopper to prevent bridging and ensure continuous discharge
（3）Reasonably set the temperature of each barrel section to ensure it is within the 180-260°C range
（4）Check the extruder drive system to stabilize the screw rotation speed
（5）Control the uniformity of the raw material particles, with the powder ratio not exceeding 5%
Conclusión clave
Unstable output is caused by unstable solid conveying, and the barrel temperature and feeding system need to be optimized.
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