F26B 17/16

Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity {, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft} the materials passing down a heated surface {, e.g. fluid-heated closed ducts or other heating elements in contact with the moving stack of material }