(Research Institute of Oji Paper Co., Ltd., Tokyo)
New pulping methods of hard wood have been studied eagerly in Japan, because soft wood has become scarce by overfelling.
Characteristics of hard wood pulp depend on the properties of the fiber, that is, short and slender shape and rich content of pentosan.
Blending the hard wood pulp in various papers, the printability of the papers are improved and such properties as formation, smoothness, opacities
rise
.
(
1
) Bleached kraft pulp of hard wood are used in fine paper, and owing to blending, the printability of the paper is improved considerably. But viscous printing ink sometimes takes away the vessels from paper surface during offset printing.
(2) Semichemical pulp and chemi-ground pulp are used in news print and photogravure paper.Properties of chemi-ground pulp are similar to ground wood of soft wood, but lower opacity.
(3) Ground wood of hard wood has high opacity, and is used in news print.
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