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A variety of hardwoods and softwoods were cooked under identical conditions (constant alkali charge, temperature and time) and yielded pulps of widely varying Kappa number but essentially constant viscosity. Wood species is therefore not a significant factor in determining the viscosity of unbleached pulp. This observation indicates that the G-factor equation for viscosity prediction (so far examined only for spruce) may have a wide applicability.
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Kubes et al. (1984) studied this question.
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