如何解决塑料颗粒出现黑点问题？

在塑料造粒过程中，颗粒上出现黑点是一个相对普遍的问题。是塑料颗粒机的问题、原材料的问题还是其他因素导致了这种现象？事实上，造粒过程中出现黑点是一个常见的故障现象，尤其是在浅色颗粒中更为明显。那么我们该如何改善这个问题呢？

这些黑点是塑料颗粒机碳化后残留的塑料热变质，为了保证塑料颗粒的质量，工作人员应经常清理机器碳化物。

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.