METHOD AND FACILITY FOR SORTING AND SEPARATING WASTE PLASTIC

摘要

A facility for sorting and separating waste plastic includes: a crusher (11) for crushing waste plastic material into waste plastic fragments; a steam-cleaning device (13) for cleaning the waste plastic fragments; a primary wet specific-gravity sorter (14) and a secondary wet specific-gravity sorter (15) for separating the waste plastic fragments into floating or sinking specific-gravity-sorted fragments with a separating liquid having specific gravity which is the median of specific gravity of materials contained in the waste plastic fragments until the specific-gravity-sorted fragments contain three or less materials; and first to third electrostatic separation devices (16A to 16C) including frictional electrification devices for frictionally electrifying the specific-gravity-sorted fragments and electrostatic sorting devices for putting the frictionally electrified specific-gravity-sorted fragments into a static electric field and altering the falling directions of the specific-gravity-sorted fragments to be separated according to the type of material.