Patent ID: 6467628
Filing Date: 2002-10-22
Classification: B03C,B29B,B29K,Y02W

Abstract:
A plastic sorting device, comprising:a pair of frictional charging devices (17) for stirring and frictionally charging different kinds of crushed plastic pieces (16); a respective electrostatic separating section (41) disposed below each of said frictional charging devices for electrostatic separation of each plastic piece according to its polarity and amount of electric charge, said electrostatic separating sections (41) being disposed laterally in a substantially symmetrical relation, each of said electrostatic separating sections (41) having a drum electrode (21) rotatable around a predetermined horizontal shaft (20), said drum electrodes (21) rotating such that sides thereof facing each other turn downward; and an opposed electrode (23) disposed adjacent each said drum electrode (21) through a separating space (22) serving as a sorting electrostatic field, said sorting device being characterized by further comprising: a collecting section (26) that is common to the electrostatic separating sections and that is disposed below the separating space (22) between said drum electrodes for separately collecting plastic pieces that have passed through said separating space and thereby separated, said collecting section (26) having a plurality of collecting chambers (47-51) for collecting plastic pieces according to kind; and a classifying section (40) that classifies said different kinds of crushed plastic pieces (16) into two groups according to size before they are frictionally charged, and thereafter loads the plastic pieces (16) into the respective frictional charging devices (17) according to group.