 HomeNewsWhat Are The Reasons For The Damage Of The Pelletizer Screw?

What Are The Reasons For The Damage Of The Pelletizer Screw?

2022-06-08

The granulator is a common mechanical equipment for rubber and plastic manufacturers. The screw is the main component of the granulator. An important impact.The screw of the granulator will be worn for some reasons, resulting in the deviation of the quality of the rubber and plastic equipment produced. What are the main reasons for the damage of the screw of the granulator?

The first:
The screw of the granulator rotates in the barrel, and the friction between the material and the two causes the working surface of the screw and the barrel to gradually wear down. The diameter of the screw gradually decreases, and the diameter of the inner hole of the barrel gradually increases. In this way, the matching diameter gap between the screw and the barrel increases little by little with the gradual wear of the two.

Since the resistance of the head and the manifold in front of the barrel has not changed, this increases the residual amount of the extruded material when it moves forward, that is, the flow of the material from the diameter gap to the feeding direction increases. As a result, the throughput of the granulator is reduced. This phenomenon increases the residence time of the material in the barrel, causing the material to decompose. If it is polyethylene, the hydrogen chloride generated by the decomposition deepens the corrosion of the screw and barrel.

The second:
Because the material is not plasticized evenly, or there are metal foreign objects mixed into the material, the rotational torque force of the screw of the granulator suddenly increases. This torque force exceeds the strength limit of the screw, causing the screw to break.

The third:

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.

The above is about rubber machinery. If you want to know more about our company's dynamics or products, you can consult us. We also sell Dispersion Kneader, Rubber Internal Mixer, Rubber Open Mill, Two Roll Mill, Plastic Granulator and Extrusion Pelletizer.

Under Water Extrusion Pelletizer

Previous: The Principle Of Plastic Granulator

Next: Starting A New Dispersion Kneader Requires Attention