Deinking of Laser Printed Copy Paper by Chemical Different Treatments and Effect on Optical and Strength Properties of Paper

Abstract

Paper recycling in an increasingly environmentally conscious world is gaining importance. With<br />rapid developments in deinking processes for the reuse of secondary fibers being made, the<br />recycling process is become more and more efficient. This work investigated the effect of<br />chemical different treatments including H2O2 and NaOH on repulping and flotation operations<br />during the deinking of laser printed copy paper, and freeness and physical properties of handsheets<br />were evaluated. In order to access to more desirable quality specification and strength properties in<br />paper production recovered from primary materials, NaOH and H2O2 , as an effective factor in<br />recovery, were added to the pulp of printer waste paper in a different ratio. Results of this research<br />show that, the optimum rate of handsheet paper was in freeness 300-400 ml, which this rate, have<br />better effect. In optical and mechanical properties of handsheet papers, maximum and minimum<br />rate were 2 to 3 (C) and 1 to 2 (A) percent ratio of NaOH to H2O2 respectively.