| 摘要 |
<p>PROBLEM TO BE SOLVED: To achieve excellent thermal efficiency, by disposing a stopper for a lid comprising a plurality of rods arranged at a predetermined distance from a heater. SOLUTION: A predetermined amount of waste plastics 1D, such as waste foamed polystyrene, is charged into a volume reduction room 1A and, a fall rid 1E of a predetermined weight having a structure formed by cladding of two sheets of steel on both surfaces of a spacer is set on waste plastics 1D. The plastics 1D is brought into contact and pressed to a heater 1D by the weight of the fall lid itself so that the plastics 1D is reduced in volume by heating at a temperature of not higher than 240 deg.C. The fall lid 1F is stopped at a position somewhat above two or more of rod stoppers 2H disposed at a predetermined distance from heater 1F. And then the temperature of heater 1E is increased to a temperature not more than 600 deg.C, especially to about 550 deg.C, and at the same time, the leakage of gases evolved from the plastics is prevented by flashing an inert gas such as N2 gas at the speed of about 10-500ml/min so as to seal the clearance between the fall lid 1E and the wall of a body, so that a decomposition liquid containing no tar substances is obtained in high yield.</p> |
