What are the uses of screw extruders

The main working mechanism of the Extruder screw barrel, which rotates with a small gap in the barrel. The extruder is a continuously working device. The raw material in the extruder is continuously supplied, plasticized, heated, and extruded into a certain shape product (tube or sheet) through the forming hole of the die. The geometric parameters of the screw are different, and the extruder also has a variety of different purposes.

It is used as a continuous mixer for two-stage mixing, and it can also be used to produce billets (profiles, pipes) of a certain shape. At this time, the extruder is called an extruder or an extruder, and some use it Make a granulator for granulation. Others use it to clean impurities in the rubber compound. In addition, screw extruders are also used for reclaimed rubber production.

When the material moves from one section to another, its properties will change greatly, so the barrel temperature must be adjusted in sections, and this section can be divided into several. The properties of the material to be processed change gradually, from the elastic and hard state thrown into the machine to the soft plasticized state when it is discharged from the machine head. The full length of the barrel can be roughly divided into three sections: feeding, plasticizing and extrusion.

The hard material is eaten in the first section of the thread edge, and the agent is moved to the space between the screw and the surface of the barrel, and then moved to the second section. In the first stage, the screw moves forward as if the screw is unscrewed from the material. In the second stage, the material is compressed by the pressure generated by the rotation of the screw on the one hand, and the pressure on the head of the barrel on the other hand. down, resulting in reflux.