What Are Common Faults Of Extruders? A Comprehensive Guide

Let’s introduce what are common faults of extruders? A comprehensive guide for you.

The production requirements of extruders are very high.
Before leaving the factory, manufacturers need to test each component and evaluate the overall performance of the machine before leaving the factory.
Therefore, this type of equipment can be used normally later and give full play to the performance of the machine.
However, if it is not operated properly or the working environment is not up to standard, malfunctions may still occur.

Common Faults of Extruders:

Screw wear

Normal wear of the extruder (From Wiki Article) screw and barrel mainly occurs in the feeding area and metering area.
The main cause of wear is dry friction between the slice particles and the metal surface.
Because the slices heat up and soften, there is less wear and tear.
Overlay welding of special wear-resistant and corrosion-resistant alloys repairs local damage to threads. The first type: gas shielding and plasma argon arc welding. The second type: metal spraying technology for repair.
First, the worn outer surface of the screw is ground, and then the alloy layer is welded to a sufficient size so that the extruder has sufficient processing allowance.

Abnormal noise

First of all, when the reducer is faulty, it is necessary to check the bearing damage or lubrication. It may also be due to gear wear, improper installation and adjustment, or poor meshing.
If this is the case, replace the bearings to improve lubrication, replace the gears, or adjust the gear meshing conditions to solve the problem.
Secondly, when the extruder makes a sharp scratching sound, check for problems such as barrel skew or scratches on the shaft head and transmission sleeve. If this is the case, adjust the barrel to solve the problem.
Finally, the barrel of the heat-resistant and wear-resistant extruder makes noise. Check the screw bending and sweeping to cause excessive friction of the solid particles. Or set the temperature, adjust the straightening screw or increase the set temperature to solve the problem.

Abnormal vibration

If this happens at the extruder reducer, check whether the bearings and gears are worn, and then replace the bearings or gears;
If it occurs at the barrel, there may be hard foreign matter in the material. It is necessary to check the cleanliness of the extruder material. If necessary, install a strong magnetic device in the hopper to absorb iron filings.

Generally speaking, with regular maintenance and inspections, faults will be obvious.
A large number of extruder failures are due to insufficient routine maintenance.

About the Author:

Andy, sales manager of Qingdao Sunshine Machinery Co., Ltd., has been engaged in plastic machinery for 5 years. Familiar with the operation and product features of various types of machines, we can provide you with high-quality services. If you have any needs, you can contact me at any time and look forward to establishing a cooperative relationship!