JAPAN TAPPI JOURNAL
Online ISSN : 1881-1000
Print ISSN : 0022-815X
ISSN-L : 0022-815X
Volume 12, Issue 9
Displaying 1-10 of 10 articles from this issue
  • [in Japanese]
    1958 Volume 12 Issue 9 Pages 564-568
    Published: September 10, 1958
    Released on J-STAGE: November 17, 2009
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1958 Volume 12 Issue 9 Pages 569-578
    Published: September 10, 1958
    Released on J-STAGE: November 17, 2009
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1958 Volume 12 Issue 9 Pages 579-585
    Published: September 10, 1958
    Released on J-STAGE: November 17, 2009
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1958 Volume 12 Issue 9 Pages 586-592
    Published: September 10, 1958
    Released on J-STAGE: November 17, 2009
    JOURNAL FREE ACCESS
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  • S. Ryu, K. Suenaga, G. Okazaki
    1958 Volume 12 Issue 9 Pages 593-597
    Published: September 10, 1958
    Released on J-STAGE: November 17, 2009
    JOURNAL FREE ACCESS
    This instrument is a portable dielectric-hygrometer that consists of 1 Mc. oscillator and double resonant circuit (I. B. Circuit), and preferable to measure moisture content of running web. Charac teristics of this instrument are to be able to measure moisture contents from only dielectric constant variance and to be not influenced by resistance varisance of paper even at relatively high moisture range. The followings are some of the test results.
    (1) Appropriately adjusting the sensitivity vari-con of this instrument, it is capable of measuring not only ordinary moisture contents (3-14%), but also relatively high moisture contents (to about 35%).
    (2) It needs appropriate calibration, because other paper properties besides the moisture content also enter the results.
    (3) The deviations of measured moisture contents amount to ± 0.3-0.4 % for ordinary range (3-14%) and ±1.5 % for high moisture range (20-35 %).
    (4) The temperature effect at the range of 15°C to 35°C is so small that we can neglect the deviations caused by temperature variance.
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  • T. Koshizawa, T. Matsugu
    1958 Volume 12 Issue 9 Pages 598-602
    Published: September 10, 1958
    Released on J-STAGE: November 17, 2009
    JOURNAL FREE ACCESS
    The influences of various treatments (acid-hydrolysis, hypochlorite bleaching, alkali-ageing and cold alkali refining) upon the reactivity of wood cellulose in emulsion xanthation were investigated.
    The results were as follows :
    1. The solubility of acid-hydrolyzed cellulose in emulsion xanthation was found to be the function of relative viscosity, and it was considerably affected by the conditions of hot alkali treatments (e. g. sulfate cooking and hot caustic purification) of wood cellulose.
    2. The solubilities of cellulose, which has been degraded to the same relative viscosity under various methods (acid-hydrolysis, hypochlorite bleaching and alkali-ageing) in emulsion xanthation were investigated.
    From this data, it seems that the content of the crystalline region has an effect upon the amount of undissolved residue after emulsion xanthation.
    3. It could be supposed that the fine structure of a cold alkali refined cellulose has a greater influence than α-cellulose content (90 g/l NaOH solubility) upon the reactivity of cellulose during emulsion xanthation.
    From these investigations, it seems that the solubility of cellulose in emulsion xanthation is dependent upon the fine structure under the conditions used in this experiments.
    As the behavior of cellulose during emulsion xanthation seems to agree with that of H3PO4 solubility, we think that the emulsion xanthation method appeared to be an useful relative yardstick for measuring the fine structure of cellulose.
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  • Keiji Uchiyama, Toru Miyata
    1958 Volume 12 Issue 9 Pages 603-606
    Published: September 10, 1958
    Released on J-STAGE: November 17, 2009
    JOURNAL FREE ACCESS
    The ageing velocity of beech alkali cellulose was investigated as a measure of the viscosity of viscose.
    The results are as follows :
    (1) The viscosity of viscose from beech pulp is lower than those from red pine and spruce pulp, but except first several hours, there is no difference between the ageing velocity of beech and other wood species.
    (2) The influences of ferric ion in the steeping lye on the degradation of alkali cellulose are not admi ttable between beech and other wood species and its effects appear only at the beginning of ageing.
    (3) The logarithms of viscose viscosity is a linear function of the D.P. Therefore, the aged alkali cellulose from beech which is lower viscose viscosity has lower D. P. than those from other wood species. (Moreover, in viscosity measurement by falling ball method, the structural viscosity is not necessary to be considered.)
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  • Studies on the Utilization of Synthetic Fiber
    Rokuro Maematsu, Kamewaka Shiozuki
    1958 Volume 12 Issue 9 Pages 607-612
    Published: September 10, 1958
    Released on J-STAGE: February 10, 2010
    JOURNAL FREE ACCESS
    The following results were obtained in consequence of the fundamental experiments on the manufacture of Nylon paper by using the traditional method of nagashi-zuki in order to make Japanese paper.
    1. Neri (obtained from the root of tororo-aoi) were preferred as the dispersing agent. N-methoxymethylated 6 nylon (type 8 nylon) emulsion were used as the bonding agent of nylon sheets.
    2. We employed nylon staple fiber of 15den. cut in various length (e.g.1, 3, 4, 5, 7 and 10mm) in making sheet of paper at 100kg/cm2 heat press using type 8 nylon as a bonding agent.Tensile strength gives maximum value at the fiber length of 4-5 mm, but decreases with increasing fiber length.
    3. “ Kamiko ” (Japanese paper clothes) in the Muromachi period and the Yedo period (1339-1867) is regarded as non-woven fabric using kazo of natural cellulosic fiber and neri as a dispersing agent, coating with konnyaku (a paste made from the starch of devil's tongue) and shibu the astringent juice of unripe persimmons as a bonding agent.These paper products were of two sorts : one was plain in color for the winter coats of popular use ; the other being made elegant looking by dyeing fancy figures upon like calico for the use of daimyos and the well.to-do. The distribution of kazo fiber length is the normal frequency distribution at the height of 10 mm. Tensile strength gives maximum value, blended with 20-30 mm cut to 7080%10mm cut fiber length.
    4. The weight of type 8 nylon remained in the sheet was measured, but were preferred 10-20%. The surface temperature of heated roller press was suitable 180-185°C at 50kg/ 30cm.
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  • [in Japanese]
    1958 Volume 12 Issue 9 Pages 613-619
    Published: September 10, 1958
    Released on J-STAGE: November 17, 2009
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1958 Volume 12 Issue 9 Pages 620-622
    Published: September 10, 1958
    Released on J-STAGE: November 17, 2009
    JOURNAL FREE ACCESS
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