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Volume 21, Issue 10
Displaying 1-6 of 6 articles from this issue
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[in Japanese]1967 Volume 21 Issue 10 Pages 525-537
Published: 1967
Released on J-STAGE: November 11, 2009
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Eiichi Taniguchi1967 Volume 21 Issue 10 Pages 538-544
Published: 1967
Released on J-STAGE: November 11, 2009
JOURNAL FREE ACCESSThis work was initiated in order to investigate peracetic acid (PA) bleaching different from NaClO2, H2O2 and hypochlorite bleaching.
Active groups content, copper number, viscosity and hemicellulose content in various bleached pulps were measured.
Under same bleaching condition, PA bleaching showed higher viscosity of pulp than hypochlorite bleaching but it showed lower viscosity of pulp than H2O2 and NaClO2 bleaching. It seemed that PA bleached pulps showed the lowest brightness among these bleached pulps, but hemicellulose content in PA bleached pulps showed high value.
At initial stage of PA bleaching CO group content in pulps increased, but it decreased with the progress of bleaching.
By means of mixing NaClO2 with PA brightness was improved and showed higher viscosity than PA bleaching. At 80°C and 90°C PA bleaching proceeded speedily and made perfect in a few minutes, although it took about 2 or 3 hours at 60°C.View full abstractDownload PDF (676K) -
Yukio Nakaba, Sigeo Oyama, Ryukichi Matsuo1967 Volume 21 Issue 10 Pages 545-556
Published: 1967
Released on J-STAGE: November 11, 2009
JOURNAL FREE ACCESSThe present investigation has aimed at establishing the paper making technique using a synthetic fiber, which has many superior characteristics.
Vinylon fiber has been developed in Japan. This fiber has similar properties to cellulose fiber, since it has many OH groups in its molecule. Present work was carried out in regard to the relation between the characteristics of constructed fiber and physical properties of the paper.
When a mixture of the vinylon fiber and pulp was beated and manufactured to paper, the short-cut vinylon fiber showed better properties than the long one, and the tow fiber better than the culed one. The increasing in the blending ratio of the vinylon fiber to pulp had a tendency to make strong the tearing strength and to weaken the tensile strength.
In an effort to determine the effect of fineness of fiber on the physical properties of the paper, various polyvinyl alcohol fibers (PVA fibers) were used as binding fibers.
It is observed that the more is the fineness of either of the basic or binding fiber used, the greater is the strength of the paper obtained. The strength of the paper is more affected by the fineness of binding fiber than basic fiber.
Authors advocated the paper making process in which the web is previously formed using non-formalized vinylon fibers and the web is formalized subsequently
Experiments showed that the paper made by this procedure had a larger wet strength. And other various physical properties were discussed in relation to the degree of formalization.
It is found that vinylon fiber which is spinned with starch is divided into fibril by beating and is capable of making paper as well as natural cellulose fiber. This fiber is named “readily fibrillable vinylon”.View full abstractDownload PDF (5838K) -
Effect of Ultrasonic Treatment on Chemical PulpsToichi Iwasaki, Junzo Nakano, Makoto Usuda, Nobuhiko Migita1967 Volume 21 Issue 10 Pages 557-563
Published: 1967
Released on J-STAGE: November 11, 2009
JOURNAL FREE ACCESSSoftwood sulphite and sulphate pulps were beaten by lampén mill and 25 kc and 400 kc ultrasonic waves, and dissolution of hemicellulose during the beating and fractional dissolution of the nitrated pulps were studied. The results are summarized as follows :
(1) The freeness change by lampén mill beating and 25 kc ultrasonic treatment proceeded in a similar manner, while 400 kc ultrasonic treatment gave only a slight freeness decrease after 6 hours treatment. The 25 kc ultrasonic treatment gave the highest water retention value when compared at the same treating time.
(2) The amount of the dissolved hemicellulose varied depending on the kind of treatment ; 400 kc ultrasonic treatment gave higher dissolution than lampén mill beating and 25 kc ultrasonic treatment when compared at the same water retention value. No monosaccharides could be found in the dissolved parts. The main portion of the dissolved hemicellulose was xylan, and a small amount of glucomannan was found. In the case of 400 kc ultrasonic treatment, however, the proportion of xylan and glucomannan was almost 1 : 1.
(3) The fractional dissolution of nitrated sulphite and sulphate pulps were carried out in ethyl acetate-ethanol mixture. The solubility of the nitrated sulphite pulp was higher than that of nitrated sulphate pulp, and cellulose framework of the nitrated sulphite pulp started to dissolve at lower ethyl acetate concentration. The beating of pulps prior to the nitration increased the solubility of the cellulose framework, but no quantitative relationship between solubility and beating degree could be found.View full abstractDownload PDF (2324K) -
[in Japanese]1967 Volume 21 Issue 10 Pages 565-576
Published: 1967
Released on J-STAGE: November 11, 2009
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[in Japanese]1967 Volume 21 Issue 10 Pages 577-586
Published: 1967
Released on J-STAGE: November 11, 2009
JOURNAL FREE ACCESSDownload PDF (1766K)
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