JAPAN TAPPI JOURNAL
Online ISSN : 1881-1000
Print ISSN : 0022-815X
ISSN-L : 0022-815X
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Volume 24, Issue 6
Displaying 1-9 of 9 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1970 Volume 24 Issue 6 Pages 289-292
    Published: June 01, 1970
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.24.6_289
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1970 Volume 24 Issue 6 Pages 293-297
    Published: June 01, 1970
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.24.6_293
    JOURNAL FREE ACCESS
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  • Studies on the Utilization of Alkali Lignin (Part 1)
    Recovery of Lignin from Black Liquor of Soda-pulp Process.
    Shoji Kagawa
    1970 Volume 24 Issue 6 Pages 298-302
    Published: June 01, 1970
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.24.6_298
    JOURNAL FREE ACCESS
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    In this paper was described an experimental study of recovery method of lignin and NaOH from black liquor.
    Crude lignin was precipitated from black liquor by CO2 at pH 7.5 and centrifugated. The yield of the deposit was 43% of wood. The lignin content of the deposit, when purified 72% H2SO4 was found to be 45.2%. From the supernatant liquor which contains 7% Na2CO3, NaOH was recovered by CaO. The yield was 18.5% per Na2O of black liquor :
    Elementary analysis, infrared spectrum, DTA, and TGA-DTA-GC of the alkali lignin and of HCl process lignin did not show marked difference.
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  • Electron Microscopic Studies of Surface Fine Structures of Papers
    Part 1. Effects of Various Coating Conditions on Fine Structures of Coated Surfaces
    Tadahira Hamada
    1970 Volume 24 Issue 6 Pages 303-312
    Published: June 01, 1970
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.24.6_303
    JOURNAL FREE ACCESS
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    The transmission and scanning electron microscopic studies were carried out as to the effects of various coating conditions on the surface fine structures of coated papers.
    In comparing various replica techniques, the modified direct carbon replica method was found to be most available for observing the latex particles migrated to the coated surfaces.
    Scanning electron micrographs revealed many holes and crevices in the coated surfaces which were hardly recognized by transmission electron micrographs.
    Results were summerized as follows :
    (1) It was found that raised fibers above the surface decreased as the coating weight increased. Most of these fibers were covered with clay coatings even in lower coating weight.
    (2) The effect of supercalendering was satisfactorily shown by scanning electron micrographs.
    (3) It was found that surfaces of coated papers were covered with binder films in proportion to the amounts of binders.
    (4) The degree of latex particles migration to the surface was found to be proportional to the drying temperature. These latex particles tended to form discontinuous films which covered pigment particles, when migration proceeded excessively.
    It is assumed that these films shall prevent papers from water absorption during high speed offset printing process.
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  • [title in Japanese]
    [in Japanese]
    1970 Volume 24 Issue 6 Pages 313-318
    Published: June 01, 1970
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.24.6_313
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1970 Volume 24 Issue 6 Pages 319-326
    Published: June 01, 1970
    Released on J-STAGE: January 22, 2010
    DOIhttps://doi.org/10.2524/jtappij.24.6_319
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1970 Volume 24 Issue 6 Pages 327-336
    Published: June 01, 1970
    Released on J-STAGE: May 07, 2010
    DOIhttps://doi.org/10.2524/jtappij.24.6_327
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1970 Volume 24 Issue 6 Pages 337-340
    Published: June 01, 1970
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.24.6_337
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1970 Volume 24 Issue 6 Pages 341-345
    Published: June 01, 1970
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.24.6_341
    JOURNAL FREE ACCESS
    Download PDF (599K)
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