Method for improving quality of deinked high grade waste paper

Details Method for improving quality of deinked high grade waste paper Method for improving quality of deinked high grade waste paper

D - Textiles, Paper

21

C

D21C 9/10 (2006.01) D21C 5/02 (2006.01)

Patent

CA 2098144

Abstract Quality of deinked/bleached high grade waste paper is improved by bleaching the deinked pulp with thiourea dioxide, said deinked pulp having been obtained by subjecting high grade waste paper to a digesting and aging step with a sulfite, alkali or alkaline peroxide, a disaggregation step, a deinking step and a dust removing step. - 1 7 -

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