Susceptibility of Deinked Waste Paper Mass to Peroxide Bleaching
Research and development
BRAK AUTORA Full text | Abstract: Secondary fibres are valuable feedstock for the paper industry, constituting about one third of the total amount of raw materials used, which is due to favourable prices, when compared to primary fibrous pulp, and as a result of waste paper recycling promotion in many European countries. The bleaching of waste paper mass is economically important and technically quite complicated since mechanical pulp of varying compositions are processed. The results presented of trials performed show how the effect of hydrogen peroxide can be enhanced by employing proper activators and other peroxy compounds like peracetic acid in the bleaching of deinked pulp (DIP) from mixed office waste (MOW). The bleaching action of the hydrogen peroxide and other peroxy compounds was intensified under the shield of stabilisers and adequate process conditions preventing excessive decomposition of the peroxide and deterioration of useful properties of the bleached waste paper pulp. The use of hydrogen peroxide and peroxide derivatives in the bleaching of MOW resulted in an effective brightness increase by several percent. |
Tags: waste paper pulp, bleaching peroxide, compound.