Abstract: Rotatable refrigeration disc is of laminated construction comprising at least two layers bonded together, and has a plurality of relatively narrow internal channels therein arranged in a winding, labyrinth-like, sinuous, zigzag pattern. The channels are sized to accommodate the passage of an evaporative refrigerant, and extend substantially throughout all of the operative portion of the disc so that the liquid freezing surfaces are close to and are chilled by the refrigerant passing through the channels. Each channel has an inlet and outlet located at a central portion of the disc. The channels extend from the center towards the perimeter of the disc and then zigzag back towards the central portion. The layers of one form are complimentary mirror images and in another form are two planar outer layers encasing a layer with channels formed on each side. The channels are formed by etching, or computer controlled machining.

Abstract: Apparatus for continuous production of flake ice comprises one or more refrigerated discs mounted on a hollow shaft. Each disc rotates in the vertical plane and includes a plurality of narrow internal channels which extend substantially over all of the operative portion of the disc and are of substantially equal length. The discs form the evaporator of a refrigeration circuit, and an evaporative refrigerant is circulated to the channels in each disc via the hollow shaft. During each cycle, water is applied to both external flat surfaces of each disc at a first angular location and the film of water which adheres thereto freezes as the disc rotates. The ice sheet so formed is removed from both sides of the disc at a second angular location by scraper blades.

Abstract: A gas head module for use in an apparatus to air treat food products, said module having a gas inlet and a gas outlet which are connect by a side wall defining a passage which follows a spiral path, with said passage diminishing in cross sectional area from said inlet to said outlet.