SODIUM CHLORITE PULPING (II):MICROSCOPIC INVESTIGATION
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概要
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Microtome preparats of wood section (thickness 20μ) obtained from the sap wood of red pine (Pinus densiflora), heart wood of larch (Larix leptolepis Murray) and beech wood (Fagus japonica Maxim) digested by 50% sodium chlorite solution and investigated under microscope. Photographs are showed on the Japanese language report in this paper.<BR>Sodium chlorite reaction conditions are as follows : NaClO<SUB>2</SUB> 5%, PH value 5 by acetic acid medium, temperature 80°C, and after digestion wash with water, then dyed with malachite green. Compared each samples of changed time of digestions. Thus sodium chlorite treated samples were dissolved in 72% sulphuric acid and cuprammonium solution respectively.<BR>All of the sap wood of red pine, the heart wood of larch and the beech wood almost same results are obtained by sodium chlorite digestion. Lignin almost dissolved in 30 minutes, and medullary ray content entirely dissolved in 20 minutes.Lignin dissolved easily and damage of cellulosic fibrils are not seen. Then, pulps obtained by sodium chlorite digestion are treated with cuprammonium solution and observed with microscope. Swollen fibers by cuprammonium solution showed in Fig. 22, 23 and 24.<BR>In short time digestion are visible spherical shape of swollen parts. These phenomena indicate that the cuticle partly remained as original state by long time digestion these spherical shape of swollen parts are not seen.
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