Extrusion & Post
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Uneven wall thickness of heat-resistant polyethylene extruded pipes (Variant: mass production scenario)
Sorun Belirtisi
The wall thickness of the pipe in the circumferential direction is uneven, and eccentric wall appears.
Uneven wall thickness affects the pressure resistance of the pipe, and the thin-walled side breaks first when under pressure, seriously affecting the use safety of the pipe.
In particular, in continuous mass production, this problem is more prominent and needs key attention.
Neden Analizi
（1）The die and the 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 output is uneven, and the melt pressure fluctuates
（4）The haul-off speed is unstable or the haul-off center is not concentric with the die
（5）The pipe sizing sleeve is worn or installed incorrectly
（6）In continuous mass production, process parameter fluctuations or equipment status changes have aggravated this problem
Çözüm
（1）Adjust the concentricity of the die and the mandrel, and the circumferential gap error should not exceed ±0.05mm
（2）Check the distribution of the die heater bands to ensure that the circumferential temperature difference does not exceed ±3°C (within the range of 190-230°C)
（3）Check the plasticizing stability of the extruder to ensure uniform output
（4）Adjust the center line of the haul-off device to align with the center of the die
（5）Check the sizing sleeve, replace it if it is severely worn, and ensure concentricity when installing
（6）And establish standardized work instructions, with special attention to parameter stability in continuous mass production
Temel Çıkarım
Uneven wall thickness is caused by uneven die gap or uneven temperature, and needs to be solved from mold accuracy and temperature uniformity.
In different production scenarios, targeted preventive measures need to be taken.
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