Patent ID: 7032850

Claim:
A used-can processing system comprising a shredder for cutting a used can, and a pelletizer for pelletizing cut pieces of the used can produced by a shredder, wherein the shredder comprises: a pair of main rotary blade units disposed such that their circumferential surfaces having blades formed thereon face each other, the main rotary blade units rotating in opposite directions, whereby the circumferential surfaces of the main rotary blade units move downward in a facing region where the circumferential surfaces face each other, to thereby cut a used can fed from above the facing region and feed the cut can downward; and a pair of auxiliary rotary blade units disposed on the upper side of the respective main rotary blade unite such that circumferential surfaces of the pair of auxiliary rotary blade units having blades formed thereon face the circumferential surfaces of the respective main rotary blade units in regions outside the facing region, each of the auxiliary rotary blade units rotating in the same direction as does the corresponding main rotary blade unit, to thereby urge, toward the pair of main rotary blade units, the used can thrown from above the pair of main rotary blade units, and wherein the pelletizer includes: a chamber provided with a receiving opening for receiving cut pieces and a screen having a pellet removal hole through which pellets having a predetermined size or less pass; a rotary body disposed within the chamber and having a hammer formed on a circumferential surface of the rotary body, the rotary body deforming cut pieces fed into the chamber to pellets by applying impact to the cut pieces by means of the hammer; a cutting line formed of a projection that is provided on a circumferential wall portion of the chamber to be located below the receiving opening; and a vertically-extending corrugated surface that is formed on the circumferential wall portion to be located below the cutting line.