JAPAN TAPPI JOURNAL
Online ISSN : 1881-1000
Print ISSN : 0022-815X
ISSN-L : 0022-815X
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Volume 44, Issue 2
Displaying 1-10 of 10 articles from this issue
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  • Development of Fine Powdered Silica for Thermal Recording Paper
    Masao Takahashi, Masanori Tanaka, Teiji Sato, Masahide Ogawa
    1990 Volume 44 Issue 2 Pages 181-193
    Published: February 01, 1990
    Released on J-STAGE: November 19, 2009
    DOIhttps://doi.org/10.2524/jtappij.44.181
    JOURNAL FREE ACCESS
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    Thermal recording paper typically used in facsmile system has been rapidly expanding to great proportions and has secured a firm position in an information-oriented society. This would result the systematic development between electronic technology in hardware industries and coating technology in paper industries including various raw material industries.
    The fine powdered silica, “Mizukasil”, has played an important role in the development of the thermal recording paper as a residue-preventing agent on a thermal head. Since this fine powdered silica has extremely fine particles and is inactive, it combines the following advantages in residue-prevention, sticking prevention, color-developing sensisivity, color intensity, dot minuteness, color gradient and runnability of the thermal head.
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  • A Report of 1989 TAPPI Coating Conference
    Chisato Hamaguchi
    1990 Volume 44 Issue 2 Pages 194-207
    Published: February 01, 1990
    Released on J-STAGE: November 19, 2009
    DOIhttps://doi.org/10.2524/jtappij.44.194
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  • Fuzzy Control and its Industrial Applications
    Kaoru Hirota
    1990 Volume 44 Issue 2 Pages 208-214
    Published: February 01, 1990
    Released on J-STAGE: November 19, 2009
    DOIhttps://doi.org/10.2524/jtappij.44.208
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    The outline of fuzzy control algorithms and its industrial applications are surveyed. Fuzzy theory was proposed by Prof. L.A. Zadeh (U.C. Berkeley) in 1965. In early 10 years a lot of teoretical papers have been published. In 1974 a guide line of fuzzy industrial applications was indicated by Prof. E.H. Mamdani (London Univ.). He applied the fuzzy inference algorithm to automatic steam engine control problem. From that time a number of R & D works have been done in the field of fuzzy control. Finally in 1980 a fuzzy controlled cement kiln was realized by F.L. Smidth Ltd. Then many Japanese industries took part in this field. At present more than 100 industrial fuzzy applications are reported. Fundamental idea in such applications lies on so called min max composition center of gravity method. This fuzzy control algorithm is also mentioned with the fundamental notion of fuzzy set theory.
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  • Automatic Warehouses in Coated Paper Production Line
    Atsushi Umeyama
    1990 Volume 44 Issue 2 Pages 215-219
    Published: February 01, 1990
    Released on J-STAGE: November 19, 2009
    DOIhttps://doi.org/10.2524/jtappij.44.215
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    3 Automatic warehouses were installed in the coated paper production line. Two of them store half-finished coated paper products and the another one stores finished products. These warehouses connected with a computer do not only automate the product handling but also improve the production and delivery efficiency.
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  • Recent Development of Instrumentation in Pulp & Paper Industry (V)
    [in Japanese]
    1990 Volume 44 Issue 2 Pages 220-226
    Published: February 01, 1990
    Released on J-STAGE: April 23, 2010
    DOIhttps://doi.org/10.2524/jtappij.44.220
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    This serial report describes current topics in pulp and paper making process instrumentation technology, and this paper is reviewed of paper machine cross direction control.
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  • Research and development of solvolysis pulping
    (V) Process engineering for solvolysis pulping
    Tetsuji Nakamura, Hiroshi Tsuchiya, Takeo Nagasawa
    1990 Volume 44 Issue 2 Pages 235-241
    Published: February 01, 1990
    Released on J-STAGE: February 22, 2010
    DOIhttps://doi.org/10.2524/jtappij.44.235
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    Process engineering for solvolysis pulping was discussed especially on energy usage comparing to KP process. The total process was constructed based on the data from experiments for each unit operation. The total energy consumed to produce 1 ADT pulp by solvolysis pulping process is nearly equal to that by KP process. To level up the energy efficiency to produce the pulp and other chemicals as by-products, a further research is required for the conversion of the lignin to the useful materials.
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  • Degradation mechanism of paper by UV treatment
    Bong-Yong Kim, Akira Isogai, Fumihiko Onabe, Makoto Usuda
    1990 Volume 44 Issue 2 Pages 242-248
    Published: February 01, 1990
    Released on J-STAGE: November 19, 2009
    DOIhttps://doi.org/10.2524/jtappij.44.242
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    In the previous papers, we have studied the influence of UV treatments on physical and optical properties of paper, and several characteristic results for UV treatments were obtained. In this paper, therefore, the mechanisms of the changes on physical properties, especially such as double folds, Young's modulus and water absorption values, by UV treatments of paper were examined in terms of molecular-order analyses of pulp and rosin chemicals.
    Cellulose in amorphous regions and hemicellulose are depolymerized through oxidative and/or radical reactions by UV treatments. This depolymerization leads to the formation of stable intermolecular hydrogen bond by molecular rearrangement, and thus the decrease in hydroxyl groups, which can interact with moisture or water, causes the decrease in hydrophilic properties of paper. This new hydrogen bond formation brings about the increase in Young's modulus, and even the slight decrease in moisture contents of paper probably causes the drastic decrease in double folds. On the other hand, porous structures of paper were found to be unchanged by UV treatments, and cross-linking reactions between cellulose chanis were not likely to form during the treatments.
    Rosin chemicals are degraded to form hydrophilic groups such as carboxylic acid from their double bonds by UV treatments. This causes the decrease in sizing degrees of rosin-sized paper, while the UV treatments bring about the increase in sizing degrees for rosin-free paper such as neutral paper owing to the formation of the stable hydrogen bond, as described above.
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  • [title in Japanese]
    1990 Volume 44 Issue 2 Pages 249-253
    Published: February 01, 1990
    Released on J-STAGE: November 19, 2009
    DOIhttps://doi.org/10.2524/jtappij.44.249
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1990 Volume 44 Issue 2 Pages 254-257
    Published: February 01, 1990
    Released on J-STAGE: November 19, 2009
    DOIhttps://doi.org/10.2524/jtappij.44.254
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  • 1988 Research Projects of Universities and Government Research Institutes
    Wood Science Committee JAPAN TAPPI
    1990 Volume 44 Issue 2 Pages 258-264
    Published: February 01, 1990
    Released on J-STAGE: April 23, 2010
    DOIhttps://doi.org/10.2524/jtappij.44.258
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