On the physical properties of the Hard wood pulp for papermaking

Abstract

Using the 5 species of hardwood in Japan, ---beech, birch, linden, oak, and willow---the wood analysis, the sulfate cooking, the bleaching, the examination of paper strength and the chemical analysis of pulp were investigated, and then the relation between the properties of wood and the paper strength were studied. The results obtained were as follows;
i) It was found from the wood analysis that the lengths of the fibers of willow and oak were short and that oak and beech had much parenchyma and that willow and linden contained much ash, extractives and proteins.
ii) The cooking was easily done with short time except willow. The pulp yeild and quality were good.The bleaching was also well done.
iii) According to the examination of paper strength, willow and oak are inferior to the other species.It is supposed that the less paper strength depends on the short fiber length and the much parenchyma.The other factors effecting the paper strength are the intertwining of fiber and physical structnre of fiber, and these factors should be worse in wi low and oak.
iv) It is supposed that birch, linden and beech are most suitable for the paper making pulp, and willow and oak are more suitable for the dissolving pulp rather than the paper making pulp.