Patent ID: 7691344

Claim:
An oil reconversion device for waste plastics which performs thermal cracking by heating a waste plastic and converts the generated cracker gas into oil by cooling, the oil reconversion device comprising: a thermal cracking bath which has a bath main body placed inside a coil, the thermal cracking bath being adapted to induction-heat the bath main body by feeding a high-frequency current through the coil, and to thermally crack at least a molten plastic obtained from the waste plastic to generate a cracker gas, an injection port through which the waste plastic is injected, a feeder which supplies the waste plastic injected through the injection port to the thermal cracking bath via a forced or direct feeding means without a bath, and an oil conversion processor which cools and converts the cracker gas generated by the thermal cracking bath into oil, wherein the thermal cracking bath includes an agitating mechanism having an agitate-scraping unit, wherein the agitate-scraping unit is adapted to agitate a molten plastic contained in the bath main body, and to scrape the molten plastic adhering to the inner wall of the bath main body, and the agitate-scraping unit includes a heater capable of heating a top surface of the molten plastic contained in the bath main body, wherein the feeder is equipped, as a forced feeding means, with an extruder having a heating cylinder, and an extruding screw which melts and extrudes the waste plastic injected into the injection port, wherein the agitate-scraping unit includes a blade which extends radially from a rotating shaft and which makes contact with an inner wall of the bath main body, and wherein the heater extends radially from the rotating shaft at a position higher than the blade.