| 摘要 |
<p>An apparatus in which unmolten matter neither stays nor solidifies and which can be stably and continuously operated. The efficiency of reduction into oil can be heightened. The apparatus needs no long screw feeder and renders plant size reduction possible. The apparatus, which is a continuous apparatus for the reduction of a waste plastic into oil, comprises a melting device which melts a crushed waste plastic, a decomposition device which further heats the molten waste plastic to gasify the plastic, a device which recovers, as a product oil, a gas bled from the decomposition device, and a residue recovery device which recovers the residue from the decomposition device, the devices being successively connected. In the melting device and the decomposition device, the waste plastic is conveyed by a screw feeder constituted of a cylinder and a rotating screw disposed in the cylinder. The blade (7a) of the screw (7) of the screw feeder (5) has notches (46) formed in at least the region thereof which corresponds to the initial stage of the melting of the crushed waste plastic in the melting device.</p> |
