Abstract: A device useful for delivering carbon dioxide snow comprises a supply conduit for providing a flow of pressurized carbon dioxide, a plurality of tubes disposed side by side, each tube having a constant cross-sectional configuration and area throughout its length, each tube having a first end the peripheral edges of which are sealed to the outside of the conduit wall and a second end which is open to the ambient atmosphere, and a plurality of apertures for carbon dioxide to flow through the conduit wall and expand to solids and vapor, there being at least one aperture communicating with the interior of each of said plurality of tubes.

Abstract: A device useful for delivering carbon dioxide snow comprises a supply conduit for providing a flow of pressurized carbon dioxide, a plurality of tubes disposed side by side, each tube having a constant cross-sectional configuration and area throughout its length, each tube having a first end the peripheral edges of which are sealed to the outside of the conduit wall and a second end which is open to the ambient atmosphere, and a plurality of apertures for carbon dioxide to flow through the conduit wall and expand to solids and vapor, there being at least one aperture communicating with the interior of each of said plurality of tubes.

Abstract: A cooling tunnel system that includes a conveyor for carrying objects through a tunnel chamber. The conveyor enables a cooling fluid to pass therethrouqh and about the objects. A plurality of slot means feeds the cooling fluid to the conveyor means. Each slot means includes at least one aperture for enabling vapor flow onto and about the objects. A plenum adjacent the plurality of slot means distributes the cooling fluid. And at least one fan in the tunnel chamber causes a flow of the cooling fluid into the plenum and through the slot means with sufficient velocity to impinge upon and cool the objects and to recirculate the cooling fluid within the tunnel chamber.

Abstract: A cooling tunnel system that includes a conveyor for carrying objects through a tunnel chamber. The conveyor enables a cooling fluid to pass therethrouqh and about the objects. A plurality of slot means feeds the cooling fluid to the conveyor means. Each slot means includes at least one aperture for enabling vapor flow onto and about the objects. A plenum adjacent the plurality of slot means distributes the cooling fluid. And at least one fan in the tunnel chamber causes a flow of the cooling fluid into the plenum and through the slot means with sufficient velocity to impinge upon and cool the objects and to recirculate the cooling fluid within the tunnel chamber.