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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.44  No.2 (2003)  >  pp.313-313

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Use of Kerosene to Improve Toner-Ink Liberation for Office Paper Recycling

Tatsuya Oki1), Shuji Owada2), Hiroki Yotsumoto1), Hirokazu Tanuma3) and Yuu Takeuchi3)
1) Particle Separation Group, Research Institute of Green Technology, National Institute of Advanced Industrial Science and Technology
2) Department of Resources and Environmental Engineering, Science and Engineering, Waseda University
3) Mineral Resources Engineering Specialization, Major in Mineral Resources Engineering and Materials Science and Engineering, Graduate School of Waseda University

A method to disintegrate photocopied or laser printed waste office paper by weak agitation and using kerosene as a toner softening agent was investigated. Under the conventional method using only sodium hydroxide, 3.8% of toner was liberated from paper. This figure increased to 98.1% by using undiluted kerosene, and to 80.1% by using 1% kerosene emulsion. Residual toner particles adhered to only one or a few paper fibers after these kerosene treatments. If residual toner was also included in this figure, toner liberation would reach 100%. The use of surfactants as dispersion agents for kerosene decreased the degree of liberation because it interferes with the softening of toner. It was also confirmed that sodium hydroxide treatment in advance of the kerosene treatment is important to increase toner liberation.

paper recycling, office paper, toner, kerosene, liberation, deinking

Received: June 21, 2002
Accepted: November 08, 2002 , Published online: September 06, 2005
Copyright (c) 2005 The Mining and Materials Processing Institute of Japan



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