JAPAN TAPPI JOURNAL
Online ISSN : 1881-1000
Print ISSN : 0022-815X
ISSN-L : 0022-815X
Volume 35, Issue 12
Displaying 1-10 of 10 articles from this issue
  • Yoshikane Mito
    1981 Volume 35 Issue 12 Pages 1031-1037
    Published: December 01, 1981
    Released on J-STAGE: November 13, 2009
    JOURNAL FREE ACCESS
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  • Tlisashi Hasegawa
    1981 Volume 35 Issue 12 Pages 1038-1043
    Published: December 01, 1981
    Released on J-STAGE: November 13, 2009
    JOURNAL FREE ACCESS
    Japanese pulp and paper industry has been closely depended on the packaging industry for the reason of increasing GNP.
    In this paper, the future trends of the consumer packaging, especially liquid containers enclosing milk, juice, sake and other drinking liquids are discussed from the view point of pulp and paper industry in Japan.
    It is observed that the total sheare of the milk container of 5001, 000 ml has almost distributing in Japanese families.
    On the other hand, it is considered that the demands of small size milk container enclosing about 200 ml shall be further increased in future because of the special needs of Japanese market.
    In addition, the juice or sake containers are rapidly increasing new market for Japan.
    It is considered that the liquid containers based on paperboard should not only be reseached from barrier mechanizms but be developed from functional properties in order to activate the weaker point rather than stronger point.
    It shall be considerable difficult in economically that the Japanese pulp and paper industry munufactures the base paper for liquid container in future, however, there is possibility that the liquid containers shall be manufactured by overseas paper mill based on the domestic specifications.
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  • 1981 Volume 35 Issue 12 Pages 1044
    Published: December 01, 1981
    Released on J-STAGE: November 13, 2009
    JOURNAL FREE ACCESS
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  • Kiyokazu Furuno
    1981 Volume 35 Issue 12 Pages 1045-1048
    Published: December 01, 1981
    Released on J-STAGE: November 13, 2009
    JOURNAL FREE ACCESS
    Generally speaking, an earthworm swallows daily its own weight (0.4 g) of feeding-stuffs. Thus, 5, 000 worms consume 20 tons of organic feeding-stuffs and the half amount, that is, 10 tons of castings is excreted. In a place of severe weather condition, however, the above figures could not be expected without any special man-power treatment.
    As for the feeding-stuffs of earthworms, the cellulose, which is resolved into sugar by the earthworm's internal ferment, properly mixed with cow or horse manure, food waste or activated sludge that contains enough starch and protein, is ideal. Those organic wastes are found with ease and are nation-wide enormous in their quantity. It is quite meanful that we reform such wates into the fertile soil. Further, the worm itself can be utilized as the feeding-sutffs for some fish farms :
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  • Mochimune Mill, Tomoegawa Paper Mfg. Co., Ltd.
    Tomoegawa Paper Co. Ltd.
    1981 Volume 35 Issue 12 Pages 1049-1056
    Published: December 01, 1981
    Released on J-STAGE: November 13, 2009
    JOURNAL FREE ACCESS
    TOMOEGAWA PAPER CO., LTD., established in 1914, has one head office in Tokyo and three mills (Mochimune mill, Shimizu mill, Shingu mill).
    Mochimune mill, which we are going to introduce in this article, is located in Shizuoka City, Shizuoka Prefecture, Japan.
    This mill was constructed in 1933.
    This mill presently possesses three Fourdrinier machines, three Cylinder machines, and one combination machine and the main products lines are as follows : Insulating Papers (Power Cable Papers, Telephone Cable Papers, Condenser Papers, Coil Papers), Speciality Paper for Information Interchange, Tracing Papers, Release Papers, Wrapping Papers and other Specialities.
    This mill has a capacity of 3, 500 tons per month of paper.
    The site for this mill is about 156, 000 m3 and the number of employee is around 500.
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  • Changes in Pore Volume of Pulp Fibres by Recycling
    Takayuki Okayama, Takao Kitayama, Raysabro Oye
    1981 Volume 35 Issue 12 Pages 1057-1062
    Published: December 01, 1981
    Released on J-STAGE: January 29, 2010
    JOURNAL FREE ACCESS
    Commercial hardwood and softwood sulphate pulp sheets, which were deaten to about 350 ml C. s. f., were subjected to recycling of a sequence of defibration, bewatering at 80°C for 6 days as flake upto five times.
    Inaccessible water or pore volume by Scallan's solute exclusion method was measured on recycled fibres, as well as the water retention value by centrifugal force., Following results were obtained.
    (1) The fibre saturation point, which was defined as the amount of inaccessible water measured by dextran corresponding to 560 Å molecular diameter, of pulp fibres before beating, beaten, and recycled for one and five times were 1.14, 1.39, 0.90 and 0.86 ml/g for the hardwood pulp and 1.12, 1.59, 1.16, and 0.86 ml/g for the softwood pulp.
    (2) Smaller pores less than 50Å in the hardwood pulp fibres seemed unaffected by recycling. However, such smaller pores in the softwood pulp fibres diminished after the first recycling.
    (3) The magnitude of centrifugal force necessary to expel absorbed water from cell walls to reach the fibre saturation point increased with recycling times. This means pore diameters in cell walls of pulp fibres decreased with recycling.
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  • On Utilization of Readily Soluble Vinylon Fiber for Making the Japanese Paper Yarn (Preliminary Experiment)
    Kuniichi Yamada, Yoko Edahiro
    1981 Volume 35 Issue 12 Pages 1063-1073
    Published: December 01, 1981
    Released on J-STAGE: January 29, 2010
    JOURNAL FREE ACCESS
    A preliminary experiment was carried out to determine the effects of Hardly Soluble Vinylon fiber and Readily Soluble Vinylon fiber when blended into raw paper for the Japanese paper yarn, and the results are as follows.
    1) The raw paper was strengthened by blending Vinylon fiber with N·UKP, especially Readily Soluble Vinylon fiber. But, when twisted into yarn, the tensile strength decreased more than that of the non-blended yarn as times of twist given to the yarn increased, provided that the Vinylon fiber content was within the limit of this experiment. In other words, the tensile strength is high when twisted a few times, whereas the tensile strength is low when twisted many times, due to damages given to the yarn by twisting.
    2) Therefore, when twisting the Vinylon fiber blended yarn, an ample amount of water must be given to soften the paper.
    3) The tensile strength of the raw paper blended with 1 d-5 mm Hardly Soluble Vinylon fiber was stronger than that of the paper blended with 3 d-15 mm Hardly Solubly Vinylon fiber, but the tensile strength of the yarn blended with 3 d-15 mm Vinylon fiber was stronger than that of the yarn blended with 1 d-5 mm Vinylon fiber. In other words, when twisted, the thicker and the longer a fiber was, the stronger the yarn became.
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  • Wood Science Committee
    1981 Volume 35 Issue 12 Pages 1074-1080
    Published: December 01, 1981
    Released on J-STAGE: November 13, 2009
    JOURNAL FREE ACCESS
  • 1981 Volume 35 Issue 12 Pages 1088
    Published: December 01, 1981
    Released on J-STAGE: November 13, 2009
    JOURNAL FREE ACCESS
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  • Krister Lundberg
    1981 Volume 35 Issue 12 Pages 1089-1095
    Published: December 01, 1981
    Released on J-STAGE: November 13, 2009
    JOURNAL FREE ACCESS
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