JAPAN TAPPI JOURNAL
Online ISSN : 1881-1000
Print ISSN : 0022-815X
ISSN-L : 0022-815X
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Volume 24, Issue 1
Displaying 1-10 of 10 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1970 Volume 24 Issue 1 Pages 1-2
    Published: January 01, 1970
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.24.1
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1970 Volume 24 Issue 1 Pages 3-6
    Published: January 01, 1970
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.24.3
    JOURNAL FREE ACCESS
    Download PDF (786K)
  • [title in Japanese]
    [in Japanese]
    1970 Volume 24 Issue 1 Pages 7-9
    Published: January 01, 1970
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.24.7
    JOURNAL FREE ACCESS
    Download PDF (3366K)
  • [title in Japanese]
    [in Japanese]
    1970 Volume 24 Issue 1 Pages 10-16
    Published: January 01, 1970
    Released on J-STAGE: January 22, 2010
    DOIhttps://doi.org/10.2524/jtappij.24.10
    JOURNAL FREE ACCESS
    Download PDF (867K)
  • Studies on Pulp Bleaching (VII)
    On the Action Characteristics of Some Bleaching Chemicals and its Significance in the Multistage Bleaching Practice
    Kazuhiko Sameshima, Tamio Kondo
    1970 Volume 24 Issue 1 Pages 17-25
    Published: January 01, 1970
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.24.17
    JOURNAL FREE ACCESS
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    A laboratory scale study was made to elucidate the action characteristics of some bleaching oxidants in the multistage bleaching of kraft pulp.
    The multistage bleaching practice should not be the simple combination of each bleaching agent. For the better understanding of essential feature of the practice, an attempt was made to divide the bleaching process into two parts. In the first part, the main requisite is the delignification with minimum degrading action on the carbohydrate's frame work, and in the second part the protection of carbohydrate fraction is the most important requisite with effective removal of the residual lignin.
    The present experiments were carried out through the above consideration and it was emphasized that chlorine dioxide and hydrogen peroxide have better bleaching properties than other chemicals. Some other suggestions for future works on kraft pulp bleaching were also made to clear the evaluation of each action characteristics.
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  • Characteristics of Poly (vinyl alcohol) grafted Cellulose Fiber
    Yoshitaka Ogiwara, Kenichiro Arai, Hiroyoshi Sato
    1970 Volume 24 Issue 1 Pages 26-30
    Published: January 01, 1970
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.24.26
    JOURNAL FREE ACCESS
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    Characteristics of poly (vinyl alcohol) (PVA) grafted pulps were studied in view of making use for paper making. The results are as follows:
    (1) Water retention value (WRY) by centrifugal method increased and moisture regain decreased with the increase of grafting per cent of the grafted pulp. The decrease in moisture regain could be explained by the fact that cellulose fiber was surrounded by PVA chain and the hydroxyl groups in cellulose chain and PVA chain interacted each other. The increase in WRV would be caused by the remarkable increase in free water in which change could be negligible in the normal WRV measurement. Because, the grafted per cent is higher, the grafted fiber is more elastic and trends to keep more free water.
    (2) From X-ray analysis, it was found that grafted PVA chain had very low crystalinity and the existence of the interaction between hydroxyl groups in the cellulose chain and PVA chain was assumed.
    (3) The strength properties of the web prepared from grafted pulps were affected by the grafting per cent and the changes were depended upon its pulp grade. Above all, the increase in tensile strength of PVA grafted SP web was remarkable. Such changes in tensile strength seemed to be related to specific volume of the web and might be interpreted by adhesive effect of PVA.
    (4) In the strength properties of the web prepared from the mixture of grafted and original pulp, any potential feature was not found except some limited case.
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  • [title in Japanese]
    [in Japanese]
    1970 Volume 24 Issue 1 Pages 31-39
    Published: January 01, 1970
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.24.31
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    George A. M. Butterworth
    1970 Volume 24 Issue 1 Pages 40-42
    Published: January 01, 1970
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.24.40
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese]
    1970 Volume 24 Issue 1 Pages 43-48
    Published: January 01, 1970
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.24.43
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1970 Volume 24 Issue 1 Pages 49-57
    Published: January 01, 1970
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.24.49
    JOURNAL FREE ACCESS
    Download PDF (1744K)
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