Common causes of failure in UPVC pipe extrusion production line

UPVC pipe extrusion production line may encounter some common faults during operation. Understanding the causes of these faults can help timely troubleshoot and improve production efficiency. The following are some common causes of failure:

1. Material pipe blockage: There are foreign matter or raw material impurities in the material pipe, which leads to poor plastic flow and blockage; the humidity of raw material particles is too high, resulting in agglomeration or adhesion inside the material pipe; the extrusion temperature is too high or too low, causing the material to melt prematurely or not completely in the material pipe; the feeding device is unstable or the feeding amount is uneven.

2. Uneven melt or rough surface: Uneven temperature leads to inaccurate temperature control in the heating zone or cooling zone, and the melt temperature fluctuates, affecting the fluidity of the material and the quality of the pipe; the extrusion speed is too fast or too slow, resulting in unstable melt pressure; the screw speed does not match, resulting in uneven flow of plastic melt; the feeding device is blocked or unstable, resulting in poor melt quality.

3. Appearance problems of pipes: Extruder temperature is too high or too low, resulting in bubbles, texture or roughness on the surface of the pipe; unreasonable mold design or wear leads to irregular shape or unstable size of the pipe; unstable cooling water temperature affects the cooling speed of the pipe, causing deformation or poor surface quality; extrusion pressure is too low or too high, affecting the appearance flatness of the pipe.

4. Unstable pipe size: unstable screw speed of the extruder leads to uneven melt flow, affecting the dimensional accuracy of the pipe; wear or damage of the mold or sizing device leads to unstable pipe size; uneven cooling system leads to different shrinkage rates of the pipe in different parts, affecting the dimensional consistency of the pipe; excessive or low die pressure may cause the stretching and thickness of the pipe to change.

5. Production line shutdown or abnormal shutdown: electrical failure, such as voltage fluctuation or electrical equipment failure;

Damage or poor lubrication of mechanical parts causes the production line to stop running; production line operation errors or improper process parameter settings lead to equipment shutdown; material problems, such as substandard raw material quality, lead to abnormal extrusion process.

6. Cooling system failure: unstable cooling water flow leads to uneven temperature on the pipe surface; blocked water pipes or failure of cooling devices lead to untimely or uneven cooling; too high or too low cooling water temperature affects the cooling effect of the pipe.

7. Screw or die wear: continuous high-load operation causes wear on the screw surface, affecting the uniform melting of the material; use of unqualified or inappropriate raw materials leads to damage to the screw or die surface; failure to clean in time during operation leads to material accumulation and increased wear.

By understanding and troubleshooting these common causes of failure, the risk of production line shutdown can be effectively reduced, product quality can be improved, and smooth production can be ensured.