JAPAN TAPPI JOURNAL
Online ISSN : 1881-1000
Print ISSN : 0022-815X
ISSN-L : 0022-815X
Volume 17, Issue 10
Displaying 1-8 of 8 articles from this issue
  • [in Japanese]
    1963 Volume 17 Issue 10 Pages 625-634
    Published: October 20, 1963
    Released on J-STAGE: November 10, 2009
    JOURNAL FREE ACCESS
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  • [in Japanese], [in Japanese], [in Japanese]
    1963 Volume 17 Issue 10 Pages 635-641
    Published: October 20, 1963
    Released on J-STAGE: January 21, 2010
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1963 Volume 17 Issue 10 Pages 642-646
    Published: October 20, 1963
    Released on J-STAGE: November 10, 2009
    JOURNAL FREE ACCESS
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  • On the Mechanism of Pulp Bleaching X
    Koichiro Sato, Akio Kobayashi, Hiroshi Mikawa
    1963 Volume 17 Issue 10 Pages 647-650
    Published: October 20, 1963
    Released on J-STAGE: November 10, 2009
    JOURNAL FREE ACCESS
    Barium lignosulfonate was treated with chlorine water and chlorinated material was isolated as barium salt with PAN and inspected for acidic groups and molecular weight.
    1) The conductometric and potentiometric titration curves of the chlorinated material are shown in Fig. 1. The titration curves are divided in strong acidic part, medium acidic part and weakly acidic part and these acidic groups are considered as sulfonic acid group, carboxyl group and phenolic hydroxyl group respectively.
    2) As is evidient from Fig. 2, the molar ratio of Ba/S in the barium salt of chlorinated lignosulfonic acid increased to 1.25, when about 4 mol Cl2/CH3O was consumed. If no carboxyl group are formed, the ratio of Ba/S must not exceed 0.5, in so far as no barium salt is formed in the phenolic group. It may be considered that the excess Ba/S of 0.75 are due to carboxyl group.
    3) When the lignosulfonic acid is chlorinated to the degree of the condition used in the technical pulp bleaching process (Cl2/CH3O_??_4), the yield of chlorinated lignosulfonic acid isolated with PAN are only half of lignosulfonic acid which was applied in the chlorination. (Fig. 3).
    4) The diffusion coefficient of the chlorinated lignosulfonic acid measured by means of the Mc-Carthy's method has a tendency to increase together with the increase of Cl2/CH3O. This fact may suggest that the molecular of the lignin was ruptured with the treatment of the chlorine water.
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  • On the Retention of Mitsumata by Various Reaping Time and the Qualities of Mitsumata Paper
    Rokuro Maematsu, Kahei Motoki
    1963 Volume 17 Issue 10 Pages 651-654
    Published: October 20, 1963
    Released on J-STAGE: January 22, 2010
    JOURNAL FREE ACCESS
    Mitsumata trees may be cut down any day in autumn when they have shed their leaves. The bark of the trees which are cut down in autumn or March of the following year is called fuyu-kawa or the winter bark, while that of the trees are cut down since April is called haru-kawa, or the spring bark. According to tradition, as a matter of course, the winter bark makes better paper, but the spring bark gives higher retention.
    The raw mitsumata is steamed, and the bark is stripped and dried. This dried bark is called kuro-kawa, or the black bark. In order to make highh-grade paper, kuro-kawa must be turned into shiro-kawa, or the white bark. According to tradition, paper after boiling the black bark with alkaline solution gives higher retention than that of the white bark.
    For the purpose of investigating these tradition, analyses were made at the various stages of the process of mitsumata paper-making. Mitsumata-Edgeworthia Papirifera Sieb..-, grown in Kochi-ken. Shizuoka race, was employed in the present study.
    The results of experiments are shown in Table, 1, 2, 3, 4 and may be summarized as follows :
    (1) The spring bark gives higher retention than the winter bark at the stage of the stripping off the black bark, while the winter bark gives highe retention than the spring bark at the process of paper-making.
    (2) It is not a fact that the black bark treated by the soda process gives high er retention than that of the white bark at the process of paper-paking.
    (3) The quality of mitsumata-paper ;
    1) Strength and stiffness of boilling the white bark is more than that of the black bark, so the winter bark is more than the spring bark.
    2) Opacity is the most in the boiling of the black bark of the spring bark.
    3) Brightness or lustre is the most in the boiling of the winter bark.
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  • Akira Yokokawa
    1963 Volume 17 Issue 10 Pages 655-664
    Published: October 20, 1963
    Released on J-STAGE: November 10, 2009
    JOURNAL FREE ACCESS
    For the development of the mechanism to classify wood fibers, which affects the quality and the cost most seriously in the dry process for the production of hardboards, a small scaled air separator of our new design was manufactured for trial, and its classifying efficiencies for the wood fibers were experimentayl investigated.
    The experimental results obtained were quite satisfactory and the fineness of manufactures was the separated almost perfect.
    Moreover the consideration for the scalinge-up on the air separator of this type was also tried, and a reliable method, was introduced.
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  • [in Japanese], [in Japanese]
    1963 Volume 17 Issue 10 Pages 665-670
    Published: October 20, 1963
    Released on J-STAGE: November 10, 2009
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1963 Volume 17 Issue 10 Pages 671-675
    Published: October 20, 1963
    Released on J-STAGE: November 10, 2009
    JOURNAL FREE ACCESS
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