Patent ID: 6365857
Filing Date: 2002-04-02
Classification: B03C,B29B,B29K,Y02W

Abstract:
A plastics sorting apparatus comprising:a charging device for charging a batch of a predetermined amount of different types of fragmented plastic chips while stirring the plastic chips; and an electrostatic sorting device for sorting plastic chips that have been charged with the charging device by passing them between a pair of sorting electrodes, characterized in that: the charging device ejects a batch of plastic chips after stirring the plastic chips for a certain period of time T that is necessary to charge the plastic chips; one of the pair of sorting electrodes is a stationary electrode, and the other of the pair of sorting electrodes is a movable electrode that is arranged to oppose the stationary electrode and adapted to rotate at a peripheral speed v; the apparatus further comprises a first feeding device for feeding batches of a feeding amount W1 of the plastic chips to the charging device, and a second feeding device for continuously feeding onto the movable electrode of the electrostatic sorting device a feeding amount per unit time W2 of the plastic chips that have been ejected in batches from the charging device; and the feeding amount per unit time W2 is set to satisfy W1/T&lE;W2&lE;vÃ—BÃ—HÃ—D where B is a width of the movable electrode, H is an average thickness of the plastic chips that have been fed onto the movable electrode, and D is a bulk density of the plastic chips.