what is used in bleaching in pulp mills
Wood is made from cellulose fibres that are bound together by a material called lignin. In a pulp mill, the fibres are separated from one another into a mass of individual fibres and after separation, the fibres are washed and screened to remove any remaining fibre bundles. The pulp may then be used directly to make unbleached paper, or be bleached for white paper. Pulp may be fed directly to a paper machine in an 'integrated paper mill' or dried and pressed into bales to be used as a raw material by paper mills worldwide. Chipping is not necessary when mechanical pulp is produced as it can be made of round wood.