JAPAN TAPPI JOURNAL
Online ISSN : 1881-1000
Print ISSN : 0022-815X
ISSN-L : 0022-815X
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Volume 44, Issue 9
Displaying 1-8 of 8 articles from this issue
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  • Potential Application of Biotechnology to Tree Breeding
    Daisuke Shibata, Takashi Hibino
    1990 Volume 44 Issue 9 Pages 953-961
    Published: September 01, 1990
    Released on J-STAGE: November 19, 2009
    DOIhttps://doi.org/10.2524/jtappij.44.953
    JOURNAL FREE ACCESS
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  • Current Development Trends of Neutral Sizing Agents
    Masao Hamada, Yoshihide Ishikawa
    1990 Volume 44 Issue 9 Pages 962-972
    Published: September 01, 1990
    Released on J-STAGE: November 19, 2009
    DOIhttps://doi.org/10.2524/jtappij.44.962
    JOURNAL FREE ACCESS
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    In the early stages, the conversion from an acid size system to a system producing alkaline sized paper has been implemented in coated base because of the use of a coated broke which includes calcium carbonate. Recently, the conversion from an acid size system to PPC paper production has been greatly expanding because of improved copy ability due to the positive polarity of the toner, and because of the increased use of recycled paper which serves to alleviate environmental concerns.
    Many papermakers have believed that alkaline papermaking results in low runnability. Recently, however, the runnability of alkaline papermaking is improving because of developments in papermaking technology and due to the use of improved neutral sizing agents.
    In this article, developmental trends in reactive alkaline sizes, as they relate to runnability, are briefly discussed.
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  • The Recent Deinking Technology of Fine Grade Waste Paper -DIP as Substitution for LBKP-
    Tamotsu Yamamoto
    1990 Volume 44 Issue 9 Pages 973-988
    Published: September 01, 1990
    Released on J-STAGE: November 19, 2009
    DOIhttps://doi.org/10.2524/jtappij.44.973
    JOURNAL FREE ACCESS
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  • High Consistency Bleaching by Hydrogen Peroxide
    Tadamichi Toyofuku
    1990 Volume 44 Issue 9 Pages 989-1001
    Published: September 01, 1990
    Released on J-STAGE: November 19, 2009
    DOIhttps://doi.org/10.2524/jtappij.44.989
    JOURNAL FREE ACCESS
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    An expansion ratio of worldwide production level of such mechanical pulp as SGW, TMP, CTMP, PGW, etc. is becoming greater. It is for this reason that the technological improvement in high consistency bleaching by hydrogen peroxide has made it possible to achieve economically a 80% brightness for mechanical pulp, or a 85% brightness (ISO) depending on the type of wood, even though the cost chemicals are taken into consideration, in addition to the growing demand by reason of a shaft to thinner paper and tremendously progressed manufacturing process.
    Some advantages of high consistency bleaching by hydrogen peroxide are as follows :
    · Supply volume of hydrogen peroxide is decreased by 2550% to achieve a brightness of same level.
    · A higher brightness is achievable by supplying a larger volume.
    · A less COD can be expected to achieve same level brightness.
    · A higher opacity of pulp is achievable.
    · A higher production yield can be expected.
    · A stabilized production process is available because the stained water cannot get into bleaching system.
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  • Characteristics of the Waterless Offset Printing
    Yoshiyuki Shirai
    1990 Volume 44 Issue 9 Pages 1002-1008
    Published: September 01, 1990
    Released on J-STAGE: November 19, 2009
    DOIhttps://doi.org/10.2524/jtappij.44.1002
    JOURNAL FREE ACCESS
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    On the offset printing the control of fountain solution is very important and difficult. By the progress of technology and electronics, we have been able to solve this problem nearly. As the waterless offset printing doesn't need to use water, this system will set us free from the trouble about it, and may lead us to automation of offset printing in the near future.
    This paper describes about the principle of waterless offset printing system and its merits or demerits compared with the conventional wet offset printing system.
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  • [title in Japanese]
    [in Japanese]
    1990 Volume 44 Issue 9 Pages 1009
    Published: September 01, 1990
    Released on J-STAGE: November 19, 2009
    DOIhttps://doi.org/10.2524/jtappij.44.1009
    JOURNAL FREE ACCESS
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  • Imaging of Mass distribution in Paper by Electrography Technique (1)
    Establishment of Electrography Technique
    Hiroshi Tomimasu, Philip Luner
    1990 Volume 44 Issue 9 Pages 1011-1017
    Published: September 01, 1990
    Released on J-STAGE: November 19, 2009
    DOIhttps://doi.org/10.2524/jtappij.44.1011
    JOURNAL FREE ACCESS
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    A rapid method to measure the mass distribution in paper was developed. Paper is irradiated with electron beams with energies from 50 to 200 keV and the attenuation of the electron beams by the paper is detected by a photographic film. The image of the attenuation of the electron beams (electrograph) is converted into the mass distribution through a basis weight calibration. Theoretical calculations and experiments were made to optimize the imaging of the mass distribution. It was found that the mass distribution of paper from 0 to 400 g/m2 can be obtained in less than 1 second.
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  • [title in Japanese]
    1990 Volume 44 Issue 9 Pages 1034-1040
    Published: September 01, 1990
    Released on J-STAGE: November 19, 2009
    DOIhttps://doi.org/10.2524/jtappij.44.1034
    JOURNAL FREE ACCESS
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