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1. (WO2018122264) METHOD AND APPARATUS FOR WASHING PLASTICS MATERIALS

Pub. No.:    WO/2018/122264    International Application No.:    PCT/EP2017/084646
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Thu Dec 28 00:59:59 CET 2017
IPC: B08B 3/04
B29B 17/02
B29K 105/06
B03B 5/28
B03B 5/40
B29L 7/00
Applicants: PREVIERO N. S.R.L.
Inventors: PREVIERO, Flavio
Title: METHOD AND APPARATUS FOR WASHING PLASTICS MATERIALS
Abstract:
Method for washing a plastics material (P) and for separating contaminating substances (C) therefrom comprises the steps of: supplying a first flow (FIN) of a washing fluid (W) together with the plastics material (P) with contaminants (C) to a washing container (2) in which a stirrer (3) generates a turbulent action to detach mechanically the contaminants (C) adhering to the plastics material (P), enabling a first fraction (X1) of heavier contaminants (C) to precipitate onto a first bottom portion (4) of the container (2), thus performing a first action of separating contaminants (C); transferring a second flow (F2) of fluid (W) with floating plastics material (P) from the container (2) to a first separating chamber (5), in which a second separating action takes place with the precipitation of a second fraction (X2) of the contaminants (C) onto a second bottom portion (6) of the first chamber (5); conveying a third flow (F3) of fluid (W) with floating plastics material (P) from the first chamber (5) to a second separating chamber (7) and evacuating by overflowing an outgoing flow (Fout) of fluid (W) together with the processed plastics material (P'); in the transit from the first chamber (5) to the second chamber (7) the agglomerates of floating plastics (P) are disaggregated, and to the third flow (F3) and to the plastics material (P) a downward propelling action (T) inside the second chamber (7) is imparted to promote a third separating action with precipitation of a third fraction (X3) of the contaminants (C) onto a third bottom portion (8) of the second chamber (7); removing from the second chamber (7) a recirculation flow (FR) comprising precipitated fluid (W) and contaminants (C) and sending the recirculation flow (FR) to a screen unit (US) that retains the contaminants (C), returning the washing fluid (W) to the first (5) or second chamber (7). The apparatus for implementing the aforesaid method is also disclosed.