deinking of laser printed copy paper by chemical different treatments and effect on optical and strength properties of paper

paper recycling in an increasingly environmentally conscious world is gaining importance. withrapid developments in deinking processes for the reuse of secondary fibers being made, therecycling process is become more and more efficient. this work investigated the effect ofchemical different treatments including h2o2 and naoh on repulping and flotation operationsduring the deinking of laser printed copy paper, and freeness and physical properties of handsheetswere evaluated. in order to access to more desirable quality specification and strength properties inpaper production recovered from primary materials, naoh and h2o2 , as an effective factor inrecovery, were added to the pulp of printer waste paper in a different ratio. results of this researchshow that, the optimum rate of handsheet paper was in freeness 300-400 ml, which this rate, havebetter effect. in optical and mechanical properties of handsheet papers, maximum and minimumrate were 2 to 3 (c) and 1 to 2 (a) percent ratio of naoh to h2o2 respectively.