A first and second electrostatic sorting sections are arranged below a tribo-electrifying
device in this order in a vertical direction to form a sorting electrostatic field
between a drum electrode and an opposing electrode. Plastic pieces separated from
the other plastic pieces by the sorting electrostatic field in the first electrostatic
separating section are introduced into a sorting electrostatic field in the second
electrostatic separating section for second separation, thereby increasing the
separation purity and recovery rate of plastic pieces.
