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Volume 12, Issue 11
Displaying 1-12 of 12 articles from this issue
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[in Japanese]1958 Volume 12 Issue 11 Pages 704-706
Published: November 11, 1958
Released on J-STAGE: November 17, 2009
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[in Japanese]1958 Volume 12 Issue 11 Pages 707-710
Published: November 11, 1958
Released on J-STAGE: November 17, 2009
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[in Japanese]1958 Volume 12 Issue 11 Pages 711-713
Published: November 11, 1958
Released on J-STAGE: November 17, 2009
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[in Japanese]1958 Volume 12 Issue 11 Pages 713-718
Published: November 11, 1958
Released on J-STAGE: February 10, 2010
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Tsutomu Kayama, Yasumasa Yonezawa1958 Volume 12 Issue 11 Pages 719-724
Published: November 11, 1958
Released on J-STAGE: February 10, 2010
JOURNAL FREE ACCESSThis paper deals with the results of studies on chemical debarking of pine (Pinusl densiflora) trees.
The experiments were conducted at Asakawa Experiment Forest in 1956 and 1957.
The results of these experiments are summarized as follows :
1. Trees treated in summer (mid May-mid August) changed needles brown in the course of a month, so it was recognized that trees were completely killed.
Trees treated in autumn (late September) changed needles brown in five months.
Check trees, girdled but not chemically treated, kept needles green until they were felled.
2. Blue stains were found in all chemically treatedtrees, especially stains were severe in trees treated in summer.
In the case of trees treated at the same time, the degree of attack by blue stain fungi depended on lapse of the days after treatment.
3. Bark insects and wood borers were observed in trees chemically treated in summer, but the degree of their attack were not significant.
4. In check trees, blue stains, bark insects and wood borers were not observed.
5. Trees chemically treated generally showed easy peeling, except thos etreated in autumn. In peeling, trees treated in summer, the affect of time of treatmentwas not significant.
6. Appreciable decrease in weight was found in chemically treated trees, so they were lighter than untreated trees and check trees.
In trees treated in mid August and late September, reduction in weight was slow.
7. Residual arsenic was very little in chemically treated trees.
A large fraction of residual arsenic remained in the top of logs and inner bark.
In wood under girdle, arsenic was not found.View full abstractDownload PDF (1043K) -
IV. The Manufacture of the Nylon Fiber Papers (3)S. Tsuchibayashi, T. Sakai, T. Nagaosa1958 Volume 12 Issue 11 Pages 725-733
Published: November 11, 1958
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSAs we could not find clothes on the market whose weights (gr./m2) are equal to that of the nylonnonwoven-fabric (the nylon fiber paper) prepared in this research, we can not positively say any conclusion. But the results obtained from this research can be summarized as follows;
(1) Generally the density of the nylon-nonwoven-fabric is smaller than those of other clothes on the market.
(2) The nylon-nonwoven-fabric shows more friction endurance and crease resistance than other thicker clothes do.
(3) The nylon-nonwoven-fabric has good air permiability and does not shrink after washing.
(4) The nylon-nonwoven-fabric has the same softness and pliantness as other clothes do, and has more rigidity, and these properties are good characters in one side but may become a defect in some case.
(5) The tensile strength and the tearing strength of the nylon-nonwoven-fabric are inferior to those of other clothes.View full abstractDownload PDF (1852K) -
K. Mori, T. Itai, K. Hirakawa, M. Ichino1958 Volume 12 Issue 11 Pages 734-739
Published: November 11, 1958
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSWe have studied the effects of the chlorine dioxide as final bleaching agent for the dissolving kraft pulp of the AKAGASHI (Quercus acuta thumb), preliminarily treated by the six stage method (NaCLO-CL-NaOH-NaCLO-Na0H-NaCLO).
The finally bleached pulps have been compared from the respects of viscose filterbility, pulp brightness and pulp testings e.g. α-cellulose, β-cellulose, pentosan, visosity, etc.Experimental design has been based on the three-way layout and three factors, the reaction temperature, the pH at start and the chemical proportion of the chlorine dioxide, have been examined. All other conditions have been fixed.
The higher the reaction temperature is, the better the viscose filterbility and the pulp brightness is. (Emulsion viscose KW are improved from 200 to 140 and below, by the chlorine dioxide bleaching at 90°C, 1.4 % CLO2as available chlorine. c. f. Emulsion viscose KW of red pine pulp are 150-120) The brightness of the finally bleached pulps rise from 88 to 92.
The viscosity and the α-cellulose of the pulps, however, are fallen off slightly. It is preferable that the chlorine dioxide proportion added is 1.4% and over. The qualities of this dissolving pulp are little affected by the pH in the range of 3-8 at start, which are not buffered. Mostly at the end point of the reaction, it falls down to 3-4.
Attention is drawn to the significance of the chlorine dioxide bleaching at higher temperature.View full abstractDownload PDF (1085K) -
Kenji Mori, Koreyuki Kai, Shuntarow Fujii, Yasuo Ono1958 Volume 12 Issue 11 Pages 740-744
Published: November 11, 1958
Released on J-STAGE: November 17, 2009
JOURNAL FREE ACCESSThe purpose of this experiment is to examine the possibility of production of furfural by pre-hydrolysis at sulphite cooking of hard wood. Pre-hydrolysis was carried out by using sulphrous acid (Total acid 5 %) and cooking was done by using of Ca-base sulphite cooking liquor (T.A. 7.5 %, C.A. 1.5 %)
The influences of pre-hydrolysis conditions on dissolution of pentosans and pulp qualities were observed.
Results were as follows :
(1) Yield, screening residue, and chlorine demand of unbleached pulp become suddenly make inferior, when the temperature of pre-hydrolysis rises over 110°C.
(2) On analytical values of bleached pulp, the remarkable differences between 100°C and 110°C, don't appear.
(3) Clogging values of the viscose by emulsion xantation method are made inferior by pre-hydrolysis, but this inferiority is almost prevent, if we use the lower temperature than 110°C as the temperature of pre-hydrolysis.
(4) The dissolution of pentosans from chip increases by the raising of temperature and prolongation of time at pre-hydrolysis.
(5) To obtain as much as possible the furfural, without injuring the reactivity and analytical values of pulp, the lower temperature and longer time in pre-hydrolysis should be recommended.
(6) The loss of pentosan in pre-hydrolysis (the difference between the dissoluted pentosan calculated from the pentosan content of pre-hydrolysis chip and the dissoluted pentosan directly measured from the spent liquor of pre-hydrolysis) slightly increases with the rising of temperature in pre-hydrolysis.
(7) It is considered that the production of furfural will be compatible with the production of dissolving pulp, if we select the suitable conditions of pre-hydrolysis, even in sulphite cooking of hard wood.
And then, we can expect that the 5-6 furfural per weight of wood may be obtained without injuring the reactsvity of pulp.View full abstractDownload PDF (886K) -
1958 Volume 12 Issue 11 Pages 744
Published: 1958
Released on J-STAGE: February 10, 2010
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[in Japanese]1958 Volume 12 Issue 11 Pages 745-751
Published: November 11, 1958
Released on J-STAGE: November 17, 2009
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[in Japanese]1958 Volume 12 Issue 11 Pages 752-753
Published: November 11, 1958
Released on J-STAGE: November 17, 2009
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1958 Volume 12 Issue 11 Pages 754-756
Published: November 11, 1958
Released on J-STAGE: November 17, 2009
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