Abstract
Alkali-dioxane pulps prepared from oak wood were bleached in two stages with ozone and hydrogen peroxide, and the influence of bleaching conditions on pulp properties was studied. The results are summarized as follows.1) The pulps showed reasonable properties after ozone bleaching under the conditions of 50 % of pulp consistency and pH 2. The sheet strengths of ozone bleached pulp decreased rapidly over 3% ozone consumption.2) The optimum brightness and viscosity were obtained after peroxide bleaching under following conditions : hydrogen peroxide 2%, pulp consistency 20%, temperature 70°C, time 2 hr, pH 11.3) In comparison with CEDED bleached kraft pulp, alkali-dioxane pulp bleached with ozone and hydrogen peroxide had better brightness stability and beatability, while its sheet strengths were somewhat inferior.
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