Pelleting can be generally defined as an extrusion type thermoplastic molding operation in which the finely reduced particles of the feed ration are formed into a compact pellet. It is thermoplastic in nature because the proteins and sugars of most feed ingredients become plastic when heated and diluted with moisture. The molding portion of the operation occurs when this heated, moistened feed is forced into a die, where it is molded into shape and held together for a short time. It then exits as an extruded product. Pressure for both molding and extrusion comes from pellet mill rolls which force the feed through the holes.
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