Granulator is a common mechanical equipment in rubber and plastic manufacturers, and the screw is the main component of the granulator. The quality of the granulator screw and barrel has a significant impact on the quality and production efficiency of the plasticized products of the materials.

  The screw of the granulator may wear out due to certain reasons, leading to quality deviations in the production of rubber equipment. So, what are the common reasons for the damage of the granulator screw?



The first type:

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

Due to the unchanged resistance of the machine head and splitter plate in front of the barrel, this increases the residual amount of extruded material as it advances, i.e. the flow of material from the diameter gap towards the feed direction increases. As a result, the production volume of the granulator decreased. This phenomenon also increases the residence time of the material in the barrel, causing material decomposition. If it is polyethylene, the hydrogen chloride produced by decomposition deepens the corrosion of the screw and barrel.



The second type:

Due to uneven plasticization of the material or the presence of metal foreign objects mixed into the material, the torque force of the granulator screw suddenly increases, exceeding the strength limit of the screw and causing it to break.



The third type:

If there are fillers such as calcium carbonate and glass fiber in the material, it will accelerate the wear of the screw and barrel of the granulator