JAPAN TAPPI JOURNAL
Online ISSN : 1881-1000
Print ISSN : 0022-815X
ISSN-L : 0022-815X
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Volume 24, Issue 4
Displaying 1-8 of 8 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1970 Volume 24 Issue 4 Pages 175-181
    Published: April 01, 1970
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.24.4_175
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1970 Volume 24 Issue 4 Pages 183-192
    Published: April 01, 1970
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.24.4_183
    JOURNAL FREE ACCESS
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  • Determination of Zeta Potential of Wood Pulp by Stream Current Method
    Fumihiko Onabe, Junzo Nakano
    1970 Volume 24 Issue 4 Pages 193-197
    Published: April 01, 1970
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.24.4_193
    JOURNAL FREE ACCESS
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    Stream current apparatus with flow circuits capable of continuous operation by circulation of permeant liquid has been developed. Zeta potential data were obtained with the systems containing wood pulp and electrolyte solution, and then surface charge density of wood pulp in electrolyte solution were calculated.
    Change in surface properties of wood pulp, such as liberation of carboxyl groups by treatment with hydrochlolic acid and decrystallization by treatment with ethylenediamine, had a marked influence on the value of zeta potential.
    Measurements of liberated hydrogen ion concentration in external liquid phase after immersion of wood pulp were also carried out and data were compared with the results of zeta potential.
    These experiments demonstrate that zete potential is dependent on the type of ion adsorption and that hydrogen ion as well as cation plays an important role as potential determining ion at interface between wood pulp and electrolyte solution.
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  • Studies of Magnesium-Base Sulfite Pubs. Part II
    Cooking with Sulfurous Acid and Magnesium Sulfate
    Sadayoshi Watanabe, Kunio Tosaka
    1970 Volume 24 Issue 4 Pages 199-206
    Published: April 01, 1970
    Released on J-STAGE: January 22, 2010
    DOIhttps://doi.org/10.2524/jtappij.24.4_199
    JOURNAL FREE ACCESS
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    When birchwood (Betula platyphylla var. japonica) was cooked H2SO3+MgSO4, the amount of the chemicals, cooking temperatures and cooking times were examined in order to obtain the high yield chemical pulp comparable to kraft pulp in the strength, and following results were given.
    1) In case of constant liquor of 28% H2SO3 and 24% MgSO4 (based on o.d., wood) cooking times required for pulping were 1.2 and 3hours at the cooking temperatures of 170, 160 and 150°C, respectively. pulps of good quality were obtained in the range of 150 to 160°C.
    2) The chemicals of such amount as 25 to 30% H2SO3 and 24 to 35% MgSO4 based on o.d.wood needed to obtain chemical pulps, in the cooking of 150°C-3hr. as well as 160°C-2hr.
    3) The former cooking condition showed better pulp properties than the latter in the same amount of the chemicals.
    4) The cooking of 150°C-3hr. using these amounts of chemicals gave the pulps of similar yield and strength.
    5) It was shown that the pulp cooked at 150°C for 3hours using the liquors of 25 to 30% H2SO3 and 24 to 35% MgSO4 is 10% higher in the yield than convetional kraft pulp and stands comparison with it in the strength.
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  • [title in Japanese]
    [in Japanese]
    1970 Volume 24 Issue 4 Pages 207-214
    Published: April 01, 1970
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.24.4_207
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1970 Volume 24 Issue 4 Pages 215-220
    Published: April 01, 1970
    Released on J-STAGE: January 22, 2010
    DOIhttps://doi.org/10.2524/jtappij.24.4_215
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1970 Volume 24 Issue 4 Pages 221-226
    Published: April 01, 1970
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.24.4_221
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1970 Volume 24 Issue 4 Pages 227-230
    Published: April 01, 1970
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.24.4_227
    JOURNAL FREE ACCESS
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