Single screw rotor

How to effectively control the wear challenge of Single Screw Rotor in plastic extruder?

Jingjiang Meijia Pump Industry Co., Ltd. has a team of experienced, skilled and trustworthy engineers who embody professionalism and unremitting craftsmanship. Jingjiang Meijia Pump Industry Co., Ltd. has demonstrated excellent expertise and unremitting pursuit of perfection from the initial stage of innovative concept design, to the complex and precise production process execution, to quality control measures, and ended with a good pump system assembly.
The Single Screw Rotor pushes the plastic raw material forward and heats it to melt through the gap between its spiral groove and the inner wall of the barrel. During the rotation process, the screw exerts shear force and pressure on the material, causing it to gradually soften and mix evenly. As the screw continues to rotate, the molten plastic is pushed to the die head and finally extruded through the die into the desired shape of the product. In this process, the screw speed, temperature, pressure and other parameters have an important impact on the extrusion effect.
In a high-temperature working environment, the wear of the Single Screw Rotor mainly comes from the following aspects:
High temperature causes the screw material to soften, and the friction between it and the inner wall of the barrel intensifies, resulting in thermal wear; the screw moves relative to the barrel, materials and other contact parts during rotation, resulting in mechanical wear; impurities such as additives and moisture in the plastic raw materials may corrode the screw surface and accelerate the wear process; design and manufacturing factors such as the screw's geometry, material selection and processing accuracy may also affect its wear resistance.
In order to control the wear of the Single Screw Rotor and improve the service life of the equipment and product quality, the following strategies can be adopted: select high-temperature resistant, wear-resistant, and corrosion-resistant high-quality alloy steel or special alloy as the screw material; apply wear-resistant coatings such as tungsten carbide and silicon nitride on the surface of the screw to improve the surface hardness and wear resistance; optimize the geometric parameters of the screw such as the helix angle, pitch, and groove depth to reduce the retention time and shear force of the material on the screw surface; enhance the cooling system to ensure that the screw and barrel are effectively cooled at high temperatures and reduce the working temperature; accurately control the heating and cooling system of the extruder to avoid excessive temperature or excessive fluctuations.
Use the extruder in strict accordance with the operating procedures to avoid overload operation and frequent start and stop; regularly maintain the extruder, check the wear of the screw and barrel, and replace the severely worn parts in time; regularly clean the screw and barrel, remove attached impurities and residues, and keep their surfaces clean; reasonably lubricate the contact surface of the screw and barrel to reduce friction and wear.
Add an appropriate amount of lubricant or anti-wear agent to the plastic raw materials to reduce the friction and wear of the material on the screw; ensure the stability of the quality of the plastic raw materials and avoid using materials containing impurities or uneven particle size.