JAPAN TAPPI JOURNAL
Online ISSN : 1881-1000
Print ISSN : 0022-815X
ISSN-L : 0022-815X
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Volume 16, Issue 9
Displaying 1-8 of 8 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1962 Volume 16 Issue 9 Pages 634-642,677
    Published: September 20, 1962
    Released on J-STAGE: February 10, 2010
    DOIhttps://doi.org/10.2524/jtappij.16.9_634
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1962 Volume 16 Issue 9 Pages 643-651
    Published: September 20, 1962
    Released on J-STAGE: February 10, 2010
    DOIhttps://doi.org/10.2524/jtappij.16.9_643
    JOURNAL FREE ACCESS
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  • The Correlations Between Various Paper Strength Testers
    Shinichiro Gen
    1962 Volume 16 Issue 9 Pages 652-665
    Published: September 20, 1962
    Released on J-STAGE: November 17, 2009
    DOIhttps://doi.org/10.2524/jtappij.16.9_652
    JOURNAL FREE ACCESS
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    Following samples, 10 newsprint (53-63g/m2), 18 printing paper (30-114g/m2) and 18 kraft papet (44-83g/m2) were tested by Tensilon tensile strength tester (Instron type), Schopper tensile strength tester, Müllen tester, Elmendorf tearing tester, M. I. T. folding endurance tester and Clark stiffness tester, and most of correlation factor between these testers were statistically significant.
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  • Studies on Cyclic Treatments of Alkali Pulp Spent Liquor and Semichemical Pulp Spent Liquor (4)
    On the Cooking Conditions in Semichemical Pulping by Reproduced Cooking Liquor (Direct Sulphitation of KP Black Liquor)
    Yutaka Kimura, Toshiro Fujii, Isao Akamatsu, Yasuichi Murao
    1962 Volume 16 Issue 9 Pages 666-672
    Published: September 20, 1962
    Released on J-STAGE: November 17, 2009
    DOIhttps://doi.org/10.2524/jtappij.16.9_666
    JOURNAL FREE ACCESS
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    The cooking conditions in semichemical pulping of beech by cooking liquor used the direct sulphitation method has been studied. This paper reports the effects of cooking temp., cooking time on characteristics of pulp.
    Semichemical pulping by reproduced cooking liquor (pH 5.48-7.2) at the liquor to wood ratio of 5 to 1 produced refinable pulp within cooking times of 3 hours at 165°C, 1 hour at 175°C and 0.5 hours at 185°C, but scp was burnt more than above-stated cooking times at maximum temp.
    The range of cooking conditions is small at reproduced cooking liquor by direct sulphitation and accordingly yield of pulp is more than 70%, roe number of pulp is more than 20.
    This phenomenon seems to be by reason of existence of Na2SO3 at acid side and lack of Na2SO3, Na2SO3 in cooking liquor.
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  • Studies on the Breaking Strength of Japanese Paper Yarn and Paper Yarn (No. I)
    The Principle and Formulation of Analysis of Elastic Properties of Japanese Paper Yarn and Paper Yarn
    Kuniichi Yamada
    1962 Volume 16 Issue 9 Pages 673-677
    Published: September 20, 1962
    Released on J-STAGE: November 17, 2009
    DOIhttps://doi.org/10.2524/jtappij.16.9_673
    JOURNAL FREE ACCESS
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    The ratio of lengthwise (machine direction) strength of raw paper of Japanese paper yarn to strength in its right angle direction is 6-1.5 : 1 in case of common raw paper, but it is 10-15 : 1 in case of raw paper of Japanese paper yarn.
    Therefore Japanese paper yarns can be considered paper yarns made by twisting fibers arranged lengthwise.
    Consequently Japanese paper yarns can be considered approximately a collective body of innumerable thin fibers in the shape of a helical spring, of which pitch angle and radius of pitch circle change continuously from inside to outside.
    From this above principle formulae for approximation of radius of pitch circle, pitch angle and quantity of plastic deformation during twisting, and besides, radius of pitch circle and pitch angle in case of very thin paper are derived.
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  • [title in Japanese]
    [in Japanese]
    1962 Volume 16 Issue 9 Pages 678-681
    Published: September 20, 1962
    Released on J-STAGE: November 17, 2009
    DOIhttps://doi.org/10.2524/jtappij.16.9_678
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  • [title in Japanese]
    [in Japanese]
    1962 Volume 16 Issue 9 Pages 682-685,700
    Published: September 20, 1962
    Released on J-STAGE: November 17, 2009
    DOIhttps://doi.org/10.2524/jtappij.16.9_682
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1962 Volume 16 Issue 9 Pages 686-694
    Published: September 20, 1962
    Released on J-STAGE: February 10, 2010
    DOIhttps://doi.org/10.2524/jtappij.16.9_686
    JOURNAL FREE ACCESS
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