Two chemical bleached pulps were treated with a crude enzyme mixture in the presence of HgCI2, (1 mM). Such treatment inhibited endo-cellulases. Xylans were- thus subjected to selective in-situ hydrolysis. The enzyme-treated pulps car. be compared to slightly beaten pulps. The modified fibers show external fibrillation and reveal strong beatability. Therefore, a decrease in energy demand can be gained in the papermaking process. A reduction of fiber intrinsic strength is, however, observed mainly due to the hydrolysis of xylan macromolecules which confirms their important role in fiber wall cohesion.
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Noé et al. (1986) studied this question.
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