JAPAN TAPPI JOURNAL
Online ISSN : 1881-1000
Print ISSN : 0022-815X
ISSN-L : 0022-815X
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Volume 32, Issue 9
Displaying 1-9 of 9 articles from this issue
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  • Establishment of Pulp and Paper Standards
    Its Origin and Progress
    Minoru Kometani
    1978 Volume 32 Issue 9 Pages 495-503
    Published: September 01, 1978
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.32.9_495
    JOURNAL FREE ACCESS
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  • Pulp and Paper Mills in Japan (2)
    -Tomioka Mill, Kanzaki Paper Co., Ltd.-
    Kanzaki Paper Co. Ltd.
    1978 Volume 32 Issue 9 Pages 504-514_1
    Published: September 01, 1978
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.32.9_504
    JOURNAL FREE ACCESS
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  • Recent Advances in Alklaine Pulping with Anthraquinone
    Akira Yamaguchi
    1978 Volume 32 Issue 9 Pages 515-520
    Published: September 01, 1978
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.32.9_515
    JOURNAL FREE ACCESS
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  • Treatment System of Dregs by Neutralization and Summarization of Industry's Response to Questionnaires Concerning the Dregs Treatment.
    Toyo Pulp Co. Ltd.
    1978 Volume 32 Issue 9 Pages 521-524
    Published: September 01, 1978
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.32.9_521
    JOURNAL FREE ACCESS
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  • Economic Evaluation of Alkali-Methanol Cooking
    Masaharu Kobayashi, Nobutake Sasaki, Koji Gobara, Takeo Nagasawa
    1978 Volume 32 Issue 9 Pages 525-532
    Published: September 01, 1978
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.32.9_525
    JOURNAL FREE ACCESS
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    Alkali-methanol cooking of mixed hardwood chip has been studied and the results were compared with kraft cooking. A recovery process of methanol which was similar to that of conventional kraft cooking was designed, and the economic evaluation was made. The results are summarized as follows.
    1) Within the present study, the most adequate condition of cooking was found to be at wood-to-liquor ratio of 1/4, methanol concentration of 40% w/v and active alkali of 16% as Na2O.
    2) Screened pulp yield by alkali-methanol cooking was about 2% higher than that by kraft cooking in the range of kappa number of 2025.
    3) The delignification rate of alkali-methanol cooking was slightly slower than that of kraft cooking, but faster than that of soda cooking.
    4) The strength properties of alkali-methanol pulps were nearly same as kraft pulp, except that the tear factor and elongation were slightly less than that of kraft pulp. The beating of the former was easier than that of the latter. The bleaching property of alkali-methanol pulp was not studied.
    5) The pulp price of alkali-methanol cooking is 2.5, 6.4 yen/kg a. d. pulp higher than that of kraft cooking. The increase of pulp price is mainly due to the steam cost for methanol recovery. In addition to the high cost of methanol recovery, a closed equipment, prevention of explosion and safety counterplot for operator must be sufficiently achieved to carry out alkali-methanol cooking and recovery.
    Therefore, the alkali-methanol cooking would not be economically feasible compared with kraft cooking at the present time or even in near future.
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  • Studies on Latex Impregnated Papers
    Part1. The Porous Structure and Rubber Distribution of Latex Impregnated Handsheets
    Tatsuo Yamauchi, Koji Murakami, Rikizo Imamura
    1978 Volume 32 Issue 9 Pages 534-540
    Published: September 01, 1978
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.32.9_534
    JOURNAL FREE ACCESS
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    The porous structure of latex impregnated papers at various rubber pick-up levels was analysed by the use of mercury porosimetry. Experimental results are presented for acrylonitrile-butadiene rubber latex impregnated handsheets which were prepared from unbeaten bleached softwood kraft pulp.
    At the rubber pick-up levels tested in this paper, total volume of sheet, which was calculated from sheet weight and pore volume measured by mercury porosimetry, does not appreciably change with increasing rubber pick-up. Therefore, the rubber is probably located in the porous structure of the base sheet. Analysis of mercury penetration and retraction curves obtained for the sheets gave the following results. 1) The pressure at which maximum penetration of mercury into the sheet occured does not decrease with increasing rubber pick-up. This indicates that the size of the openings of the interconnected pore space in the sheet stays constant. 2) The pressure at which maximum retraction of mercury from the sheet occured decreases with increasing rubber pick-up, especially at a rubber pick-up of about 30%. This indicates that the size of the interstices of the interconnected pore space in the sheet increases. The scanning electron micrographs (Fig.2) show how some fibers become compacted into dense bundles while the spaces around them increase in size when the rubber pick-up level is high.
    The distribution of rubber in the sheet was also investigated by comparison of cumulative pore volume curves of the sheets before and after impregnation. The rubber fills first the smallest microscopic pore, followed, successively, by increasingly larger pores as the rubber pick-up increases. Consequently, the space around the points of contact between fibers in the sheet becomes completely filled at a rubber pick-up of about 40%. The interstices between fibers are subsequently partially filled with rubber as the rubber pick-up increases beyond 40%.
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  • Studies on Flocculation and Sedimentation Treatment of Pulp Mill Effluent (Part-2)
    An Approach of a Closed System using Ettringite Compounds
    Tsutomu Horikoshi, Osamu Ebinuma, Yukio Kita, Hisao Ishikawa
    1978 Volume 32 Issue 9 Pages 541-547
    Published: September 01, 1978
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.32.9_541
    JOURNAL FREE ACCESS
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    The purposes of this paper are to evaluate the properties of flocculation and sedimentation of Ettringite which was made by reaction of Al2 (SO4)3 and Ca (OH) 2 at pH 11.0 or above and to explore implementation of a closed system using these compounds.
    The results are summarized as follows :
    (1) It was found that the treatment with Ettringite was superior in COD removal of pulp mill effluent to the Alum treatment and the Massive lime method and the sludge from this treatment could be used closedly.
    (2) Changes of Ettringite compounds in this closed system are elucidated by X ray analysis.
    (3) This closed system is affected by other compounds (for example, SiO2, MgO). It is most important to remove these compounds for effective result of this closed system.
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  • [title in Japanese]
    1978 Volume 32 Issue 9 Pages Preface3-Preface7
    Published: September 01, 1978
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.32.9_Preface3
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  • [title in Japanese]
    1978 Volume 32 Issue 9 Pages Preface8
    Published: September 01, 1978
    Released on J-STAGE: November 10, 2009
    DOIhttps://doi.org/10.2524/jtappij.32.9_Preface8
    JOURNAL FREE ACCESS
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