Production & Quality
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Uneven wall thickness of polyolefin plastomer extruded pipes
Fenómeno del problema
The wall thickness of the pipe in the circumferential direction is uneven, showing eccentric wall phenomenon.
Uneven wall thickness affects the pressure resistance of the pipe; the thin-walled side ruptures first under pressure, seriously affecting the safety of pipe use.
Análisis de la causa
（1）The die and mandrel are not concentric and the gap is uneven
（2）The melt temperature is uneven and the temperature difference in the circumferential direction of the die is large
（3）The extruder discharge is uneven and the melt pressure fluctuates
（4）The hauling speed is unstable or the hauling center is not concentric with the die
（5）The pipe sizing sleeve is worn or installed incorrectly
Solución
（1）Adjust the concentricity of the die and mandrel, with the circumferential gap error not exceeding ±0.05mm
（2）Check the die heating ring distribution to ensure the circumferential temperature difference does not exceed ±3°C (180-230°C range)
（3）Check the extruder plasticization stability to ensure uniform discharge
（4）Align the center line of the hauling device with the center of the die
（5）Check the sizing sleeve; replace it if severely worn, and ensure concentric installation
Conclusión clave
Uneven wall thickness is caused by uneven die gap or uneven temperature, and needs to be solved from mold precision and temperature uniformity.
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