Abstract: A used-can processing system includes a shredder for cutting a used drum can, and a pelletizer for pelletizing cut pieces of the used can. The shredder includes a pair of rotary blade units which rotate with their blades meshing each other so as to cut a used drum can thrown from above the shredder, and a pair of auxiliary rotary blade units which face the respective rotary blade units and rotate in the same direction as do the corresponding rotary blade units, to thereby urge the used drum can toward the pair of rotary blade units. Each of the blades of the rotary blade units and the auxiliary rotary blade units has projecting portions and depressed portions formed alternately along the circumferential direction. Moreover, a screen having cut-pieces removal holes is disposed below and along the pair of rotary blade units and the pair of auxiliary rotary blade units.

Abstract: In order to apply reclaimed oil to surfaces of empty cans each formed from a steel material and an aluminum material and having a coated surface and to heat the oil-applied empty cans, an empty-can treatment system includes a rotary kiln for heating the empty cans; a screw-type conveying apparatus for conveying the empty cans to the rotary kiln; and a reclaimed oil tank from which reclaimed oil is fed so as to be applied to the empty cans conveyed by means of the screw-type conveying apparatus. The screw-type conveying apparatus includes a casing pipe allowing the empty cans to pass therethrough; and a shaft portion disposed within the casing pipe and having a screw portion formed on the circumferential surface thereof. The shaft portion is formed of a pipe having oil discharge holes formed thereon at predetermined intervals.