To granulate granular matter of PE and PP by separating chlorine-containing plastic and PE and PP from waste plastic.
A film-like plastic is charged in a charging hopper 1 to be crushed into a particle size of 50 mm or less by a crusher 2 and the crushed plastic is transferred to a washing and mixing tank 4 by a blower 3. The crushed plastic is stirred by a stirrer 5 within the washing and mixing tank and, during this period, PE and PP are heated to melting points thereof or higher by a specific gravity soln. composed of a urea aq. soln. (urea:water = 10:1) heated to 190°C to be melted to become liquid droplet matter. The liquid droplet matter of PE and PP mixed by the stirrer 5 and other chlorine-containing plastic (PVC) pieces are transferred to a separation tank 7 by a pump 6 and the liquid droplet matter of PE and PP low in specific gravity is separated from the chlorinecontaining plastic high in specific gravity within the separation tank 7 to rise and cooled to below the melting point thereof in a cooling pipe 8 to be molded and granulated into granular matter with a particle size of 6mm or less. The granular matter is separated from the specific gravity soln. by a vibration screen 9. The chlorine-containing plastic pieces separated from PP and PE are discharged from the lower part of the separation tank 7.
IWASAKI TOSHIHIKO
OKUYAMA KEIICHI
