JAPAN TAPPI JOURNAL
Online ISSN : 1881-1000
Print ISSN : 0022-815X
ISSN-L : 0022-815X
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Volume 18, Issue 11
Displaying 1-11 of 11 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1964 Volume 18 Issue 11 Pages 453-458
    Published: November 05, 1964
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.18.11_453
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1964 Volume 18 Issue 11 Pages 459-465
    Published: November 05, 1964
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.18.11_459
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1964 Volume 18 Issue 11 Pages 466-471
    Published: November 05, 1964
    Released on J-STAGE: January 22, 2010
    DOIhttps://doi.org/10.2524/jtappij.18.11_466
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1964 Volume 18 Issue 11 Pages 472-476
    Published: November 05, 1964
    Released on J-STAGE: January 22, 2010
    DOIhttps://doi.org/10.2524/jtappij.18.11_472
    JOURNAL FREE ACCESS
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  • Studies on the Oxidation Decomposition of Lignin
    2. The Degradation by Sodium Peroxide of Aromatic Compounds Structually Related to Softwood Lignin
    Hisao Ishikawa, Tae Oki
    1964 Volume 18 Issue 11 Pages 477-484
    Published: November 05, 1964
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.18.11_477
    JOURNAL FREE ACCESS
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    The color improvement in a commercial bleaching of high-yielding pulps is due to the fact that the chromatophoric groups responsible for discoloration are chemically combined with the constituents and are removed from the pulps when these are treated with the bleaching agents, such as sodium peroxide, hydrogen peroxide or organic per-acids. It is also discussed that some of the groups is converted to the lighter colored groups during sodium peroxide bleaching.
    To gain a better understanding the mechanism of pulp bleaching, the chemical degradation by above agents of aromatic compounds structually related to softwood lignin was carried out in a dilute sodium peroxide solution (pH's 12, 7 and 2) at 30°C. for a belonged period.
    Products thus obtained in this way were vanillin, vanillic acid, 2-methoxy-p-hydroquinone, 2-methoxy-p-benzoquinone, muconic acid, maleic acid and oxalic acid from vanillyl alcohol, vanillylethyl ether, acetovanillone and guaiacylmethyl carbinol at pH 12. It also appears that the formation of 2-methoxy-p-hydroquinone and 2-methoxy-p-benzoquinone from vanillin was accelerated in an alkaline sodium peroxide solution. On the other hand, the oxidation products, such as vanillin, vanillic acid and protocatechualdehyde were formed from vanillyl alcohol, vanillylethyl ether, acetovanillone and guaiacylmethyl carbinol by treating the substructes in a sodium peroxide solution adjusted to pH 2. It was further identified the formation of all oxidation products, which were derived from under above conditions, from aromatic compounds employed in a neutral sodium peroxide solution.
    These results indicate that vanillyl alcohol and its ether groups of the lignin residue present in pulp would be selectively converted to 2-methoxy-p-benzoquinone and the polymer via vanillin and 2-methoxy-p-hydroquinone during the course of alkaline sodium peroxide bleaching.
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  • Influence of Grafted Pulp on the Properties of Paper
    Part II Influence of Degree of Grafting on the Paper Properties
    Sang Bong Lee., Mitsuo Fujii
    1964 Volume 18 Issue 11 Pages 485-491
    Published: November 05, 1964
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.18.11_485
    JOURNAL FREE ACCESS
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    Using the acrylamide (AA) and methyl methacrylate (MMA) grafted pulps of various degree of grafting, two kinds of paper were made as follows :
    (a) One was made from the grafted pulp only.
    (b) The other was made from the mixed pulp consisted of higher grafted and original pulp.
    Some physical properties of these papers were compared.
    The papers made from original pulp were saturated with various concentration of polymer solution and their properties were also tested.
    1) Thickness of the paper made from the grafted pulp increased with increasing degree of grafting and a linear relationship was found between degree of MMA graft and thickness.
    2) Both tensile strength and fold endurance of the paper made from AA grafted pulp increased with increasing degree of grafting, while those of the paper made from MMA grafted pulp decreased.
    3) Tear strength of the paper made from AA grafted pulp decreased remarkably with increasing degree of grafting, but that of MMA grafted pulp showed a maximum strength at about 10% grafting.
    The differences between (a) and (b) in tensile strength, fold endurance, and dimensional stability were discussed.
    The fact that the papers show the different properties was considered to have the relation to the hydrophilic or hydrophobic nature of grafted pulp.
    The properties of papers made from methyl acrylate (MA) and vinyl acetate (VAc) grafted pulp were also determined, the tensile strength decreased with increasing degree of grafting and the freeness of these hydrophobic pulps were higher than that of the ungrafted pulp.
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  • Studies on Hardwood Resin (IV)
    On the Resin from Decamphored Wood Chip (2)
    Kokki Sakai, Masashi Sumimoto, Tamio Kondo
    1964 Volume 18 Issue 11 Pages 492-498
    Published: November 05, 1964
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.18.11_492
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    The present approach to resin problems has aimed to apply extractives chemistry to pulp resin problems in an effort to provide basic knowledge for their solution, especially by methods which have been proposed or are already in use. A systematic investigation of the nature of the neutral components of resin from Cinnamomum camphore Nees has led to the isolation and characterization of a number of normal and iso-aliphatic hydrocarbons (normal, C15…C25 and iso series, C17…C23), six normal aliphatic alcohols (C16…C28), β-sitosterol and keto alcohols.
    The concept of injurious wood pitch to some extent is re-evaluated in this approach in terms of the physical characterization (molecular polarity) of each resin components.
    Data is provided on the molecular polarities and de-resination rate of the resin components. This information is useful especially for processes of mechanical and chemical pulp de-resination.
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  • [title in Japanese]
    [in Japanese]
    1964 Volume 18 Issue 11 Pages 499-501
    Published: November 05, 1964
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.18.11_499
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  • [title in Japanese]
    [in Japanese]
    1964 Volume 18 Issue 11 Pages 502-506,501
    Published: November 05, 1964
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.18.11_502
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1964 Volume 18 Issue 11 Pages Preface1-Preface6
    Published: November 05, 1964
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.18.11_Preface1
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  • [title in Japanese]
    [in Japanese]
    1964 Volume 18 Issue 11 Pages Preface7-Preface8
    Published: November 05, 1964
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.18.11_Preface7
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