Pellet extruding machine

Details Pellet extruding machine Pellet extruding machine

1993-07-13

1995-05-30

Kilner, Christopher

Refrigeration

Processes

Circulating external gas

62341, B29C 4300

Patent

active

054191386

ABSTRACT:
An extruder for converting pressurized liquid CO.sub.2 feed into dry ice pellets of predetermined shape and size, wherein the CO.sub.2 snow formation, CO.sub.2 snow compaction, and dry ice pellet extrusion phases occur simultaneously to achieve production rates on the order of 700-1000 lbs/hr. The compacted CO.sub.2 snow may be in the form of a solid cartridge or irregularly shaped solids, and such compacted particles may constitute an end product by themselves. The increased production rates are also achieved by enhanced removal of CO.sub.2 gas from the CO.sub.2 snow formation chamber, and use of a bidirectional internal regeneration cylinder to provide compactive force. The extruder is portable, since it only weighs approximately 1000 lbs., can be powered with a non-stationary energy source, and may be used to remanufacture partially sublimated dry ice solids into extruded dry ice pellets of a predetermined shape and size.

REFERENCES:
patent: 2127300 (1938-08-01), Kobold
patent: 2253880 (1941-08-01), Zieber
patent: 3077081 (1963-02-01), Schnoor
patent: 3576112 (1971-04-01), Frost et al.
patent: 3618330 (1971-11-01), Hardt
patent: 3708993 (1973-01-01), Hardt et al.
patent: 3835657 (1974-09-01), Scudder
patent: 4412852 (1983-11-01), Umino et al.
patent: 4727687 (1988-03-01), Moore
patent: 4780119 (1988-10-01), Brooke
patent: 5301509 (1994-04-01), Lloyd et al.

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