Abstract
Chemical pulps from red lauan wood were ozonated at various ozone charge to determine ozone consumption, brightness and bleached yield. The brightness reversion and the physical characteristics of the bleached pulps were also studied. About 85% brightness could be achieved by bleaching at an optimum ozone consumption followed by peroxide in second and third stages. Peroxide bleaching was found to be effective in reducing the brightness reversion. Alcohol-benzene and cyclohexane extracts had a negative effect on the brightness and the brightness reversion. Ozone bleached kraft pulp had better overall strength properties than those of CEDED bleached pulp. The strength properties of ozone bleached alkali-methanol pulp were lower than those of the pulp bleached with the CEDED sequence.
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