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.
