JAPAN TAPPI JOURNAL
Online ISSN : 1881-1000
Print ISSN : 0022-815X
ISSN-L : 0022-815X
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Volume 35, Issue 2
Displaying 1-6 of 6 articles from this issue
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  • Summarization of Responses to Questionaire Sent to Member Companies Concerning the Balance of Kraft Pulp Lime Mud Kiln
    [in Japanese]
    1981 Volume 35 Issue 2 Pages 153-159
    Published: February 01, 1981
    Released on J-STAGE: January 29, 2010
    DOIhttps://doi.org/10.2524/jtappij.35.153
    JOURNAL FREE ACCESS
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    Japanese TAPPI Energy Committee conducted a questionaireresponce survey in November, 1979 with the member companies concerning the lime kiln equipments of kraft pulping process and their heat balance. This report discusses summary results of the survey.
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  • ALCAPER PROCESS A Chemical Pulp without Sulfur : Alkali-Peroxide Pulping
    Robert Thermet
    1981 Volume 35 Issue 2 Pages 160-166
    Published: February 01, 1981
    Released on J-STAGE: November 13, 2009
    DOIhttps://doi.org/10.2524/jtappij.35.160
    JOURNAL FREE ACCESS
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  • Pulp and Paper Mills in Japan (29)
    Yufutsu Mill, Sanyo-Kokusaku Pulp Co., Ltd.
    Sanyo-Kokusaku. Pulp Co. Ltd.
    1981 Volume 35 Issue 2 Pages 167-180
    Published: February 01, 1981
    Released on J-STAGE: January 29, 2010
    DOIhttps://doi.org/10.2524/jtappij.35.167
    JOURNAL FREE ACCESS
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    Yufutsu Mill has been producing various kinds of high grade paper with its intergrated pulp and paper production facilities since 1943. It succeeded in producing 100% hardwood BKP, a first in Japan, and has put “Silver Ring”, our company's highly approved brand of fine paper, onto the world market. The mill has grown into quite a modernized giant through the construction of a coated paper production facility and a new paper production machine, and the rebuilding of the pulp production facility.
    Yufutsu Mill's advantageous location in the seaside indnstrial area of Tomakomai and its huge land area (5.35 million m2) are just a couple of the promising aspects for the future.
    Many plans to make the mill more attractive are either under construction or consideration.
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  • Pressurized Defibration of Chemically Pretreated Hardwood Chips
    Mitsuya Shichita, Kokki Sakai, Tantio Kondo
    1981 Volume 35 Issue 2 Pages 181-187
    Published: February 01, 1981
    Released on J-STAGE: November 13, 2009
    DOIhttps://doi.org/10.2524/jtappij.35.181
    JOURNAL FREE ACCESS
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    Chips of four hardwood species having different specific gravity were impregnated with alkaline sulfite solution and then defibrated at various temperatures up to 170°C. The following results were obtained.
    1) Strength properties of hardwood CTMP were improved with increasing defibration temprature, while somewhat lower temperature, 120°C, seemed to be optimum for softwood CTMP.
    2) Tensile strength values of hardwood CTMPs were 2 to 3 times those of TMPs of the same species, though only poplar CTMP was superior to pine TMP in terms of strength properties.
    3) Strength properties of TMP and CTMP were greatly affected by corrected specific gravity of starting woods. Hower, influence of cellular composition of the wood may not be disregarded.
    4) CTMP process was effective to brighten the pulps of dark-colored woods but with an expense in pulp yield.
    5) Energy consumed for defibration was decreased with increase in corrected specific gravity of wood chips. The defibration energy in CTMP process was as low as 40% of that in TMP process of the same species.
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  • Study on the Morphology of Paper-making Hemps. VI
    The Distribution of Pectin in Flax Stem
    Hiroshi Hara
    1981 Volume 35 Issue 2 Pages 188-192
    Published: February 01, 1981
    Released on J-STAGE: November 13, 2009
    DOIhttps://doi.org/10.2524/jtappij.35.188
    JOURNAL FREE ACCESS
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    Flax stem was cut to obtain cross sections by a microtome after soaking and freezing, and then stained with a ruthenium-red solution.
    Light absorption of this specimen was measured by φ3 gm spots at 180 × 180 μm2 area of circumference of cambium of flax stem.
    The distribution of pectin was displayed as a contour in four grades of absorption.
    The absorption was measured by φ1 μm spots at 20 × 20 μm2 area adjacent to a bast fiber.
    The distribution of pectin was displayed as a threedimensional graph.
    Based upon these results, we examined the distribution of pectin on the phloem, cortex and epidermis of flax stem.
    On the other hand, flax stems without retting and retted flax fibers and xylems were extracted by ethyl alcohol-benzene mixture, and then pectin was extracted by EDTA-2Na solution.
    It was determined as galactulonic acid by a carbazole-sulf uric acid method.
    The neutral sugar, which was exracted with EDTA-2Na solution, was determined quantitatively by the phenol-sulfuric acid method as pentosan, by which the pectin content was corrected.
    It was found that pectin exists about 4 to 5% in flax stem, most of which distributes in the adjacent area of epidermis.
    About the secondary phloem, pectin exists in primary wall and middle lamella and little in the secondary wall.
    Moreover, pectin exists about 1.5% in the bast, fiber and about 1.3% in the xylem after retting.
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  • [title in Japanese]
    1981 Volume 35 Issue 2 Pages 193
    Published: February 01, 1981
    Released on J-STAGE: November 13, 2009
    DOIhttps://doi.org/10.2524/jtappij.35.193
    JOURNAL FREE ACCESS
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