Screening is designed to remove fractions of materials which are smaller than the equipment's screen holes. Ideally, the process is aimed at the removal of all the undersized particles in the production line. However in practical applications, the screened larger materials will still be mixed with pieces which are finer than the holes. If you are experiencing this problem extensively in your plant or laboratory, your industrial vibrating equipment has lower than optimal efficiency. Here are some simple guidelines to help improve the performance of the equipment.
The dip angle of the screening surface will affect the operational efficiency of the machine. If the incline is too steep, the materials fed to the vibrating screen will move too quickly across the surface. The production capacity of the line will be high but the results will be poor because of the low screening efficiency. You can make your equipment more effective in the task by using an optimal angle. Generally, the angle of the surface should be approximately 15⁰ because the materials will move at a low speed and allow sufficient time for screening. It is also important to avoid decreasing the dip angle too much because this will compromise the level of production.
Larger vibrating screens have higher efficiency than smaller ones, so you should consider upgrading your production line if possible. A bigger screen will have increased force in vibration and higher operating amplitude. This will reduce undesirable jams in the screen and the material will remain loose, promoting fast and efficient screening.
Additionally, compare the surface area of the screen to the amount of the material being fed to the equipment. Pouring less material on the surface will increase the efficiency of the screening process. In practical applications, you will need to match the efficiency to the rate of production to ensure that the company is profitable. Consider feeding the vibrating screen material volumes which are slightly lower than the indicated screening capacity. About 80% will ensure good resulting product without compromising the rate of plant production significantly.
Using a multilayer screen in your industrial vibrating equipment will considerably improve the quality of results. The feature is designed such that the upper layer has large screen holes and the lowest has the smallest. The material will be loosened after being fed to the upper screen, the middle surface will layer the particles which fall on it and fine screening will take place on the lower layer. This method prevents screen blockage while greatly advancing efficiency.