Patent ID: 6415929
Filing Date: 2002-07-09
Classification: B03C,B29B,B29K,Y02W

Abstract:
A plastic separation method comprising the steps of: feeding a mixture of plural types of-crushed granular plastic pieces (1) into a triboelectric charger (3); agitating the plastic pieces in the triboelectric charger for triboelectrically imparting the plastic pieces (1) with different amounts of charges having different polarities depending on the type of plastic; and electrostatically separating the plastic pieces (1) into a fraction containing pieces (1a) of a particular plastic and a fraction not containing the particular plastic pieces (1a) in an electrostatic separating section (G) for separation of the particular plastic pieces (1a) from the plastic pieces (1); wherein granular pieces of the particular plastic or granular plastic pieces of the same type as the particular plastic are additionally fed as a triboelectrification agent into the triboelectric charger (3) for triboelectrically imparting the particular plastic pieces with a polarity and an amount of charge which allow for separation of the particular plastic pieces (1a) in the electrostatic separating section (G), if the weight of the particular plastic pieces (1a) is smaller than 10% of the total weight of the plastic pieces (1).