the belts being arranged in a sinuous or zig-zag path

Full Title

Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement (F26B13/00 takes precedence ) > with movement performed by belts carrying the materials; with movement performed by belts propelling the materials over stationary surfaces > the belts being arranged in a sinuous or zig-zag path