Importance

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Abstract

A method and apparatus for processing material cascading through a treatment chamber uses a plurality of vertically stacked shelves divided into trays by spaced apart openings. As the shelves rotate, material contained with each tray is discharged through one of the openings to one or more trays of an underlying shelf. The material to be processed is supplied to the uppermost shelf through one or more material inlets, and discharged from the lowermost shelf through one or more material outlets. The material that enters each feed opening stays substantially together as it spirals down through the chamber. The multiple trays provide for shorter retention time of material within each tray which is adaptable for processing heat sensitive materials along separate material flow paths within the treatment chamber.

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First Claim