The S&B step classifier is a compact plant that incorporates detailed technical solutions allowing it to operate without any rotary feeder. The minimal-wear operation thus achieved and its very fine setting options convert this air classifier into an effective solution for the waste disposal industry.
Operating principle
Material is carried to the classifier head on a belt conveyor, and falls down onto a baffle plate. The plate’s variably adjustable inclination causes the materials to slide down and distribute over the plate surface. When the material slides over the step, its lightweight fraction is extracted towards the rear. A change in the position of a second plate located below allows to vary the extraction velocity at the step.
On an optional basis, the classifier can be provided with a nozzle installed opposite in order to create a slight incoming flow and optimize the classifying process even further. Following successful separation, the heavy fraction is transported away via conveyor belts. After its extraction, the lightweight fraction is separated by a cyclone or a light fraction separator.
Technical specifications
| Input product | Fine grain (household waste, mixed plastic wastes, glass, scrap, refuse-derived fuels) |
| Input product size | 10-60 mm |
| Input product quantity | approx. 1-8 t/h |
| Input fraction bulk density | 20-400 kg/m³ |
| Purity | Depending on the input material |
| Air volume required | 4,000–20,000 m³/h |
| Variants (overall width) | STS-775, STS-900, STS-1000, STS-1200, STS-1400, STS-1600 |
| Benefits |
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Step Classifier System
Step classifier with expansion chamber offering an effective option for adhesive lightweight material
If you need to classify adhesive material as, e.g., PET labels, the thing to do would be to provide for an additional expansion chamber.
After their extraction from the classifier head, lower flow velocities in the expansion chamber will make the labels sink to the bottom from where they will be discharged automatically by using a belt conveyor and a rotary feeder. This will prevent them from sticking to and clogging pipework and fans.
The optional integration of a separator directly into the expansion chamber will increase efficiency even further and will also provide an especially compact variant.