¿Cómo resolver el problema de las manchas negras en los pellets de plástico?

En el proceso de granulación de plásticos, es un problema relativamente común encontrar manchas negras en los gránulos. ¿Es un problema de la máquina granuladora de plástico, de las materias primas u otros factores los que conducen a tal fenómeno? De hecho, el problema de las manchas negras en el proceso de granulación es un fenómeno de fallo común, especialmente más obvio en los gránulos de color claro. Entonces, ¿cómo podemos mejorar este problema?

Estos puntos negros son el deterioro térmico plástico residual de la máquina de pellets de plástico después del carburo. Para garantizar la calidad de los pellets de plástico, el personal debe limpiar con frecuencia el carburo de la máquina.

Use harder plastic or its return material and white mineral oil for cleaning, and the temperature should be appropriately increased by 10~15°C.

At this time, the plasticizing ability of the small extruder should be considered. For large and medium-sized extruders that can plasticize ultra-high molecular weight plastics, they can be cleaned with ultra-high molecular weight plastics or their return materials and white mineral oil.

Because the hardness of ultra-high molecular weight plastics is better, and when the temperature is high, the cleaning object will be softened, so that it becomes easy to fall off, which is beneficial to the carbides being carried out by the plastic melt.

During the cleaning process, the speed of the plastic pellet machine can be repeatedly switched between low speed and high speed. If there is still a spare motor load, you can repeatedly stop and restart the extruder several times during the operation, which can improve the cleaning effect.

When the carbide in the plastic melt is obviously reduced, gradually adjust to the appropriate temperature, then the normal production.