Extruder screw barrel

Extruder barrel screw series: suitable for pipes, sheets, and granulation

　　Extruder screw barrelCause of damage

1. The extruder screw rotates inside the barrel, and the friction between the material and the two gradually wears down the working surface of the extruder screw and barrel: the diameter of the extruder screw gradually decreases, and the diameter of the inner hole of the barrel gradually increases. In this way, the diameter gap between the extruder screw and the barrel gradually increases as they wear out.

However, due to the unchanged resistance of the machine head and splitter plate in front of the barrel, this increases the leakage flow of the extruded material as it advances, that is, the flow of material from the diameter gap towards the feeding direction increases. As a result, the production volume of the extruder decreased. This phenomenon also increases the residence time of materials in the barrel, causing material decomposition. If it is polyethylene, the hydrogen chloride gas produced by decomposition enhances the corrosion of the extruder screw and barrel.

2. If there are fillers such as calcium carbonate and glass fiber in the material, it can accelerate the wear of the extruder screw and barrel.

3. Due to uneven plasticization of the material or the presence of metal foreign objects mixed into the material, the torque force of the extruder screw suddenly increases, exceeding the strength limit of the extruder screw and causing it to twist and break. This is an unconventional accident damage.

　　Extruder screw barrel

The screw is a key component of the extruder, and its material must have characteristics such as high temperature resistance, wear resistance, corrosion resistance, and high strength. At the same time, it should also have good cutting performance, low residual stress after heat treatment, and low thermal deformation.