Device to sort a mixed solid waste stream

Abstract

A system for sorting mixed solid waste includes a rotating auger disc screen, air stream generator, and optionally adjustable tilt and motor speed. Waste is conveyed across a screen bed defined by spaced discs mounted to rotatable shafts, which are configured to create both axial and transverse movement, producing diagonal flow paths. An air stream is directed across the screen to propel light or flexible materials toward a proximal edge, while heavier, bouncing, or rigid items may exit along different edges or fall through the screen. The device is tunable to separate material into multiple output fractions based on mass, shape, and flow behavior. Discs and shafts may have non-round profiles and elastomeric surfaces to increase agitation and reduce wrapping. In some embodiments, airflow and tilt angle may be dynamically adjusted. The system concentrates maintenance-risk materials such as long, sharp, or wrapping items to improve downstream equipment protection.