JAPAN TAPPI JOURNAL
Online ISSN : 1881-1000
Print ISSN : 0022-815X
ISSN-L : 0022-815X
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Volume 11, Issue 12
Displaying 1-7 of 7 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1957 Volume 11 Issue 12 Pages 697-702
    Published: December 10, 1957
    Released on J-STAGE: November 17, 2009
    DOIhttps://doi.org/10.2524/jtappij.11.697
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1957 Volume 11 Issue 12 Pages 703-707
    Published: December 10, 1957
    Released on J-STAGE: February 10, 2010
    DOIhttps://doi.org/10.2524/jtappij.11.703
    JOURNAL FREE ACCESS
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  • The Studies on the Determination of Pentosans in Pulps by UV Absorption Spectrum
    1. Determination of Pentosans in Pulps by “Smith-method”
    M. Okubo, K. Nakashima
    1957 Volume 11 Issue 12 Pages 708-710,715a
    Published: December 10, 1957
    Released on J-STAGE: November 17, 2009
    DOIhttps://doi.org/10.2524/jtappij.11.708
    JOURNAL FREE ACCESS
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    A determination method of pentosan content in pulps using UV absorption spectrum was reported by E. D. Smith and L. N. Rogers in 1953. This method is a simple one and depends upon the experimental results that furfural and hydroxymethyl furfural (HMF) have the same UV absorption spectrum, the colorimetric method using anilin acetate gives the correct furfural content and by using the constant distillation conditions the yield of HMF is constant and not affected by the type of pulps.
    Further to make sure of the validity and practicality of this new method, we have compared its results with those obtained by the usual colorimetric method (modified O'Brien and Davis method).
    From these studies it is shown that (1) the UV method is very much rapider and simpler to use than the colorimetric method and has the same precision, (2) the distillation rate and distillate volume should be 2ml/min., and 200ml., respectively, therefore in these conditions we can obtain the comparable data with those obtained from the usual method (e. g. TAPPI distillation conditions 3ml/min, 300ml.), (3) the amount of the sample has little effect on the results and 0.5g. of dry pulp seems to be of advantage, (4) this method is more affected by distillation condition than colorimetric method, therefore the distillation condition should be kept strickly constant.
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  • Seasoning of Pulpwood
    Y. Osumi
    1957 Volume 11 Issue 12 Pages 711-715
    Published: December 10, 1957
    Released on J-STAGE: November 17, 2009
    DOIhttps://doi.org/10.2524/jtappij.11.711
    JOURNAL FREE ACCESS
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    Making comparative study at our laboratory between Akamatsu (Pinus densiflora) cut in spring and that in autumn in point of its seasoning effects on pitch trouble, pulp yield and strength, we came tothe following conclusion :
    (1) As a result of experimental study on ether soluble substance of saw dust and sulphite pulp, the amount of pitch stick to wire, chemical characteristics (acid value, saponification value, iodine value, etc.) and composition of extracted pitch and pitch specks on pulp sheets, (a) pulpwood cut in spring, seems to have little pitch trouble when pulped soon after the cut, with such trouble reaching the maximum for 2-3 month seasoned wood and trouble lessened when seasoned for about 8 months and on : (2) pulpwood cut in autumn likewise has little pitch trouble when used soon after the cut with such trouble reaching the maximum for 2-3 month seasoned wood and then trouble levelling off to a neglible extent at about 12-month seasoning.
    (2) Pulp yield and strength have practically no variation with seasoning extent. When wood is seasoned for more than 12-months, however, both data have a trend to decrease slightly.
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  • Studies on the Preparation of Wagami (Part 6)
    On Sodium Perborate Polycompounds (Selbex, Surface Active Agent, P. C. B) Applied in Caustic Soda Cooking
    Rokuro Maematsu, [in Japanese]
    1957 Volume 11 Issue 12 Pages 716-719
    Published: December 10, 1957
    Released on J-STAGE: November 17, 2009
    DOIhttps://doi.org/10.2524/jtappij.11.716
    JOURNAL FREE ACCESS
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    We report on the experiment that sodium perborate polycompounds (surface active agent P. C. B) is used 0, 1, 2 % for assistant in 15 % caustic soda cooking to “ Kozo Kuro kawa” of Yaguchi Prefecture growth.
    As the results of the experiments, we recognized that the addition of 1 % P. C. B was especially fine and, yield of bleaching pulp and paper was each increased by 5.5 % and 3 %. respectively. From the result of chemical analysis, the increase of yield consists in pentosan ond wax.
    In the addition of P. C. B 2 %, strength, quality, stiffness of paper and yield were decreased.
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  • [title in Japanese]
    [in Japanese]
    1957 Volume 11 Issue 12 Pages 720-724
    Published: December 10, 1957
    Released on J-STAGE: November 17, 2009
    DOIhttps://doi.org/10.2524/jtappij.11.720
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1957 Volume 11 Issue 12 Pages 725-729,741
    Published: December 10, 1957
    Released on J-STAGE: November 17, 2009
    DOIhttps://doi.org/10.2524/jtappij.11.725
    JOURNAL FREE ACCESS
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