Table of Contents
Magnetic and Electrical Separation
Volume 11 (2002), Issue 1-2, Pages 63-92

Electrostatic Separation of the Shredded Plastic Mixtures Using A Tribo-Cyclone

Satellite Venture Business Laboratory, Faculty of Engineering and Resources Sciences, Akita University, Akita 010-8502, Japan

Received 13 July 2001; Revised 25 July 2001; Accepted 26 July 2001

Copyright © 2002 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


In this experimental work, artificial plastic mixture of two kinds of components (i.e. PET and PE mixture) is tribo-electrostatically separated. The mixture is charged by friction in a tribo-cyclone.

After a certain residence time inside the tribo-cyclone, the charged plastic flakes fall down freely through a horizontal electric field into collection bins. The DC electric field of up to 333 kV/m is created by using two plate electrodes made of Cu and having a given cross-section configuration. The plastic flakes of the mixture are drawn to either positive or negative electrode according to the polarity of the charge and are separated by falling into different bins. In order to ensure an easy and efficient separation, the inner wall of the tribo-cyclone is made of a suitable plastic material to improve the frictional charging of the flakes. Each plastic component is separated with a grade higher than 95% and recovery higher than 75%.