Untersuchungen zur Herstellung von chemo-mechanischen Holzstoffen aus Buche und Birke

Chips from beech and birch wood were treated at room temperature with Na₂SO₃ and NaOH solution respectively as well as with mixtures of both compounds at different concentrations. This was followed by a two-stage defibration after a thermal pretreatment of the impregnated chips at temperatures between 125 and 175 °C. A temperature of 170 °C was necessary to reach satisfactory pulp properties. The best pulping results were gained with a mixture of Na₂SO₃ and NaOH. No remarkable increase of pulp strength by post treatment of the CMP with ozone was achieved.