... the deinking chemicals V. Bleaching enzyme of xylanase During the pulp cooking process, the xylan which is the major components ... part of the re-precipitate Xylan, this will increase the pulp matrix porosity and releasing the soluble lignin, therefore, the ... agent can easily and effectively penetrate into the pulp, the bleachability of pulp can be increased accordingly, the Xylzyme-PBA enzyme ...