METHOD FOR SORTING PLASTICS AND PLASTICS SORTER

PROBLEM TO BE SOLVED: To provide a method for sorting plastics, in which plastics can be sorted and collected easily at a low cost for each kind and the sorting accuracy is high, and a plastics sorter. SOLUTION: Two or more kinds of plastic mixtures previously crushed are thrown into a hollow-shaped sorting tank 1 and plastic powder is made in a fluidizing condition by flowing a fluid from a mouth for inflow 6 upward. The plastics which are smaller in specific gravities than that of the fluid surfacing on the fluid level is collected from a fluid level discharging pipe 3, and the plastic mixtures with larger specific gravities than that of the fluid are stratificated and separated correspondingly to the specific gravities. After the plastics 1 of the low specific gravities are collected from a discharging pipe 4b at an upper part in the immediate vicinity of an interface of each plastic layer, the mixtures of plastics 1 and 2 are collected from a discharging pipe 4c at a low part in the immediate vicinity of the interface, and subsequently the plastics of the high specific gravities are collected from a discharging pipe 4d at a lower part. The mixtures of plastics 1 and 2 collected from the intermediate discharging pipe 4c are again subjected to the next sorting operation. Corresponding to the desired sorting number of the plastic mixtures, the above operations are repeated. COPYRIGHT: (C)2005,JPO&NCIPI