Abstract
Technology for the manufacture of unbleached and bleached pulps from hardwoods and softwoods is well established. With softwoods, the CTMP process offers significantly improved pulp quality profiles relative to those exhibited by mechanical pulp. In the case of hardwoods, the CTMP process offers a quality improvement from a low strength filler-type pulp to one capable of contributing significantly to overall sheet strength. Peroxide bleaching results in high brightness levels at reasonable peroxide consumption levels. In addition, alkaline swelling in conjunction with bleaching provides additional improvement in density and bonding properties, particularly in the case of hardwood CTMP.Unbleached and bleached CTMP from both types of wood exhibits useful physical property profiles across a wide range of drainage characteristics. The pulp is already used extensively in a broad spectrum of products ranging from low freeness printing papers to high freeness absorbent grades. With the increasing price of fully bleached chemical pulps, there is growing interest in the use of bleached CTMP in printing and writing grades. While concerns remain regarding the brightness and brightness stability of lignified high yield pulps, these factors are not impeding the growth rate of CTMP.
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