JAPAN TAPPI JOURNAL
Online ISSN : 1881-1000
Print ISSN : 0022-815X
ISSN-L : 0022-815X
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Volume 32, Issue 12
Displaying 1-10 of 10 articles from this issue
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  • (IV) Improvement and Progress of Wet Part of Paper Machine
    Sueki Ueda
    1978 Volume 32 Issue 12 Pages 669-676
    Published: December 01, 1978
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.32.12_669
    JOURNAL FREE ACCESS
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  • Pulp and Paper Mills in Japan(5)
    -Iwakuni Mill, Sanyo Kokusaku Pulp Co., Ltd.-
    Sanyo Kokusaku Pulp Co. Ltd.
    1978 Volume 32 Issue 12 Pages 677-688_1
    Published: December 01, 1978
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.32.12_677
    JOURNAL FREE ACCESS
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  • A Caliper Gauge on the Principle of Air Micrometers
    Shigeshiko Yamamoto
    1978 Volume 32 Issue 12 Pages 689-695
    Published: December 01, 1978
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.32.12_689
    JOURNAL FREE ACCESS
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  • Report of 1918 Joint Seminar on High Yield Pulping
    J.TAPPI
    1978 Volume 32 Issue 12 Pages 696-711
    Published: December 01, 1978
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.32.12_696
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1978 Volume 32 Issue 12 Pages 712
    Published: December 01, 1978
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.32.12_712
    JOURNAL FREE ACCESS
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  • Studies on Quinone Additive Cooking
    Part 1 Effect of Quinone Addition on Alkaline Cooking
    Yoshika Nomura, Masato Nakamura
    1978 Volume 32 Issue 12 Pages 713-721
    Published: December 01, 1978
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.32.12_713
    JOURNAL FREE ACCESS
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    Adding a small quantity of quinone compounds, such as anthraquinone, tetrahydroanthraquinone, dihydrodihydroxyanthracene, dihydroxyanthraquinone to the cooking liquor of kraft, soda, low-sulfidity kraft and polysulfidepulping will increase pulp yield, accelerate delignification and improve pulp quality.
    If the chemicals like quinone, hydroquinone and som others have redox potential (E0) within the range of 0.1..0.25 V and also have enediol structure, these chemicals will be effective in this case.
    Quinone additive cooking can be applied directly in ordinary kraft pulping plants. Furthermore, it will have the same effect on pulping of softwood, hardwood, eucalyptus and many other woods.
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  • Effect of Beating Condition on Shrinkage during Drying
    Tsuneaki Kijima, Isao Yamakawa
    1978 Volume 32 Issue 12 Pages 722-727
    Published: December 01, 1978
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.32.12_722
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    In general, beating can be classified to two groups which are called “wet beating” and “free beating”. This report deals with the effect of beating conditions on shrinkage of the sheets during drying. Hardwood and softwood bleached sulfate pulps were beaten with a Niagara beater under various conditions of temperature, pulp consistency and load during beating Handsheets made from beaten furnishes were compared with each other in regard to sheet shrinkage during drying and dimensional stability of the sheet. These results obtained are summerized as follows :
    1) When handsheets were prepared from unbeaten or slightly beaten pulps, shrinkage of the sheets from hardwood pulp was smaller than that from softwood pulp. As beating was greatly exceeded, shrinkage of the sheets from hardwood pulp increased more evidently than that from softwood pulp.
    2) As compared with the sheets made from wet beaten pulps, the sheets from freely beaten pulps shrank more greatly during drying, but showed less stress during its shrinking.
    3) Shrinkage during drying was affected greatly by length of the fiber which composed the sheets. That is, sheets composed of comparablly long fibers showed larger shrinking stress but less shrinkage during drying.
    4) Pulps beaten freely were shorter in length of fiber than wet beaten pulps of comparable C. S. F. so the sheets made from freely beaten pulps were more unstable in dimensional stabilitythan those from wet beaten pulps. With regard to light scattering coefficient and another physical properties, the difference between the sheets dried with restriction to shrink and those without it was more evident in freely beaten pulp.
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  • Erratum to : Establishment of Pulp and Paper Standards
    1978 Volume 32 Issue 12 Pages 728
    Published: 1978
    Released on J-STAGE: January 22, 2010
    DOIhttps://doi.org/10.2524/jtappij.32.12_728
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  • Mechanical Properties of Paper under Impact Conditions (4)
    Change in Sheet Structure by Repeated Impulsive Forces
    Minoru Kimura, Takashi Kadoya
    1978 Volume 32 Issue 12 Pages 729-734
    Published: December 01, 1978
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.32.12_729
    JOURNAL FREE ACCESS
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    It seems to be valid that mechanical properties of paper obtained in laboratory scale cannot be applied to a runnability in paper mills or an usage of paper, if its dynamic properties or response under high speed excitation are neglected In this study, rupture mechanism of pulpsheet by repeated impulsive forces was investigated from view point of change in reflectance properties and irreversible deformation of paper.
    Main points obtained here are as follows.
    All of the bleached softwood kraft pulp sheets used were failed when increase in specific scattering coefficient (Δ S) reached to value of 40 cm2/g, despite a hammer swing angle or repeated impulsive times. The repeated times to failure at the same swing angle varied widely from sample to sample in the case of lower swing angle. On the other hand, ΔS corresponded well to the irreversible deformation of sheet. These results lead to the assumption that the irreversible deformation or the increase in specific scattering coefficient is a more dominant factor than the subjected total impact energy in the fatigue or impact rupture properties of paper.
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  • [title in Japanese]
    1978 Volume 32 Issue 12 Pages Preface3-Preface4
    Published: December 01, 1978
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.32.12_Preface3
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