Air classifiers for recycling separate particles of different densities using an air flow and the relationship between the force of inertia and/or gravity and the drag. The machines are used in the recycling industry and paper processing.
NESTRO develops wind sifter specifically for each project. Our air classifiers are primarily used for the separation of film and paper particles, but can also be used for the separation of dust or granulates.
Simple air separators for recycling
These air classifiers, which consist of a blow hood and suction hood separate light fractions, such as foils and paper, from other heavy fractions. Their variable blow and suction powers are used in foil and paper separation, for example.
Our three-fraction air classifier
The NESTRO three-fraction separator NDFS 14, which generates a pure PET fraction, transports the material to be classified to the classifier housing via an acceleration conveyor with controllable belt speed. A targeted air flow spreads the discharge parabola of the sorted material.
Heavy and light fractions can now be captured separately before and after the rotating partition. The light fraction is blown upwards and captured in the upper area of the classifier by an infinitely adjustable suction hood before it is fed into the light fraction separator.
The wind sifter operates in recirculating air operation, where 10% to 40% of the excess air is used for dust extraction. Appropriate measures in the classifier housing prevent any material from the light fraction from being carried into the heavy and target fraction flow.
Construction of an air classifier