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| ALKALI DARKENING AND ITS RELATIONSHIP TO PEROXIDE BLEACHING OF MECHANICAL PULP | |
| 作者姓名： | Eric Zhang |
| 作者单位： | Holmen Paper |
| 摘 要： | INTRODUCTIONAlkali darkening is a concern during peroxidbleaching, as it affects the bleaching efficiency anthe brightness ceiling of mechanical pulp [1-3]. Giuset al. [4] showed that the alkali darkening omechanical pulps is caused by the formation oortho-quinones and coniferaldehydes. The latter wafurther supported by others [5,6]. In addition, othechromophores such as quinone condensatioproducts, stilbenes, or hydroxyquinones, were alsproposed to account for the alkali darkening omecha… |
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