Author/Authors :
Sol?r، نويسنده , , R. and Dibdiakov?، نويسنده , , J. and Mamo?، نويسنده , , M. and Ka??k، نويسنده , , F. and R?zgov?، نويسنده , , Z. and Vacek، نويسنده , , V. and Siv?k، نويسنده , , J. and Gaff، نويسنده , , M.، نويسنده ,
Abstract :
A comparable series of specimens from spruce wood were pre-treated with sodium hydroxide, sodium hydroxide and hydrogen peroxide, or per-acetic acid sequences. The pre-treatments reduced the yield of pulps and their Kappa number noticeably, diminished the degree of polymerization moderately, and increased their brightness. One-step peroxide bleaching of pulps from the pre-treated spruce wood resulted in their higher brightness compared to bleached pulp from sound wood. From the viewpoint of improved properties of pulp, the most efficient were the sodium hydroxide/per-acetic acid and per-acetic acid/sodium hydroxide sequences. The pre-treatments did not influence mechanical strength of the obtained pulps significantly.
Keywords :
Spruce wood , pre-treatment , kraft pulp , kappa , Pulp properties
