A vibrating screen separates materials by size. By agitating the material particles, the vibration allows the smaller pieces to rapidly drop through the burden depth, separating the materials as subject to the specific application.
Vibrating screens can be used to separate out large oversized particles and remove fine particles and dust - as well as being able to separate any size in-between when implementing additional screening decks.
Typical applications include:
- Protective screening - removing oversize materials or agglomerate with policing screens
- Dewatering - a vibratory screen separates granular and bulk solids from liquids
- Separation screening - separating material into individual size fractions through grading & sizing
- Dedusting screens - removing fines prior to bagging or packing
- Course grading and sieving
- Fine grading
Manufactured in either open or enclosed construction, vibratory screens can be designed in stainless steel for use in hygienic environments such as the food or pharmaceutical industry, or in carbon for heavy duty tasks such as foundry, recycling, glass, scrap or waste recovery applications.
A vibratory screen can separate, grade, dedust or dewater a wide variety of materials, including:
- Food produce - chocolate, grains, granules, crisps, pasta, dried fruits, sweets and more
- Pharmaceutical products - capsules and powders
- Recycled materials
- Heavy materials - rock, sand, gravel or stones
- Glass - particularly in removing the water from broken or used glass bottles
- Chemicals and dry fertilisers
Screen panels are replaceable and often quickly interchangeable. They can take the form or woven wire panels, perforated plate or special polyurethane panels. Throughput rates vary with overall dimensions of the overall unit as well as the screening aperture size - where there is a significant difference in separated size, throughput rates are often higher. Where the separated fractions are of a similar size, larger screens are required to achieve higher throughput rate.
The majority of Applied Vibration screens are linear action, whereby the material is conveyed forwards in a continuous manner. The vibrating action provides optimal separation of the materials such that efficient screening takes place. The discharge and collection of the separated fractions
Vibratory screens can also include a conveying deck to move the fines material forward - this enables the fines and oversize to be discharged via outlet spigots which can be orientated in line or out to the sides. This is also true of multi-deck screens.
The action of the vibrating screen means that product is only in contact with the screen panel for approximately 55% of the time, and so wear is very much reduced providing a long and reliable screening panel life.