JAPAN TAPPI JOURNAL
Online ISSN : 1881-1000
Print ISSN : 0022-815X
ISSN-L : 0022-815X
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Volume 40, Issue 9
Displaying 1-8 of 8 articles from this issue
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  • A Few words to young Engineers based on my Career
    Suketada Ito
    1986 Volume 40 Issue 9 Pages 803-807
    Published: September 01, 1986
    Released on J-STAGE: October 27, 2010
    DOIhttps://doi.org/10.2524/jtappij.40.803
    JOURNAL FREE ACCESS
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  • Advanced Materials and Papermaking Science
    Takashi Kadoya
    1986 Volume 40 Issue 9 Pages 808-818
    Published: September 01, 1986
    Released on J-STAGE: October 27, 2010
    DOIhttps://doi.org/10.2524/jtappij.40.808
    JOURNAL FREE ACCESS
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    This paper which modifies the presentation at 1986 Annual Meeting of Fiber Science and Technology in May 12-15 sponcerd by The Society of Fiber Science and Technology, Japan, is over viewed the contributions of new papermaking science by developed and underdeveloped advanced materials.
    The paper has mainly several view points as follows;
    1. Functionarity of paper is now going to change from purpose of printing, packaging and wiping, so called three mainly uses of paper, to more high technological applications such as micro filtration of paper, medical paper or electro-magnetic shielding paper.
    2. Paper is a multilayer structure of fibers with numerous microscale pores. However, pore size of paper made by wood pulp fibers is limited because the width of natural cellulose fiber is almost 20-40 microns.In order to controlles the filtration properties of structures, ultra fine thread of glass fibers, rayon fibers, synthetic fibers and other functional fibers has been applied to industrial market. These filters are now utilizing to electronics fields, medical packaging and heat exchangers.
    3. Many kinds of carbon fibers, metal fibers and metal coated synthetic fibers areintroducing to improve the electro conductivity, electric insulating and electro-magnetic wave shielding.
    4. Cellulose wadding containing super absobent polymer made by starch, cellulose and synthetic resins are supplying for bed pads, insert and adult diapers as well as packaging materials.
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  • Wetting in the Papermaking and Converting Processes (IV)
    Hiroshi Yamada
    1986 Volume 40 Issue 9 Pages 819-845
    Published: September 01, 1986
    Released on J-STAGE: October 27, 2010
    DOIhttps://doi.org/10.2524/jtappij.40.819
    JOURNAL FREE ACCESS
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    In the last part of this series, wettings in relation to the printing, that is, wetting in offset printing, wetting with gravure ink and wetting of flexographic resin plate were reviewed. In the latter half, various surface-energetic data of polymers including polymer melts and adhesives were collected. Effect of surface treatments on wetting was also described.
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  • The Coal Fired Boiler
    Yoshiaki Okazuka
    1986 Volume 40 Issue 9 Pages 846-851
    Published: September 01, 1986
    Released on J-STAGE: October 27, 2010
    DOIhttps://doi.org/10.2524/jtappij.40.846
    JOURNAL FREE ACCESS
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  • Ultrasonic Measurement of the Consistency of Pulp Suspension
    Pan Yan Long, Takashi Kadoya, Makoto Usuda, Kojiro Nakata, Teruo Makit ...
    1986 Volume 40 Issue 9 Pages 853-860
    Published: September 01, 1986
    Released on J-STAGE: October 27, 2010
    DOIhttps://doi.org/10.2524/jtappij.40.853
    JOURNAL FREE ACCESS
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    Ultrasonic attenuation of suspensions prepared by various types of pulps was measured in view of developing a new technique for monitoring the consistency of pulp slurry. Desirable relationship was found between the fiber consistency and the ultrasonic attenuation by the fibers in a certain consistency range. The effects of freeness, filler and sizing agents, etc, were also studied. Compared with general methods, the technique proposed is of high accuracy, has a broad measurable range in low pulp consistency and is less affected by filler and the color of pulp, etc. Therefore, it is considered to be most suitable for measuring pulp consistency below 2-3 percent.
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  • The fundamental investigation on kraft cooking from the viewpoint of chemical engineering
    Part 4 The relationship of cooking degree and pulp quality
    Miyuki Kojima, Junzo Aoi, Hiroshi Tsuchiya, Takeo Nagasawa
    1986 Volume 40 Issue 9 Pages 861-869
    Published: September 01, 1986
    Released on J-STAGE: October 27, 2010
    DOIhttps://doi.org/10.2524/jtappij.40.861
    JOURNAL FREE ACCESS
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    This paper concerns to investigate the relationship between pulp characteristics (yield, viscosity, sugar composition) and cooking degree in kraft pulping.
    The unbleached kraft pulps of Buna (Fagus crenata Blume) and Akamatsu (Pinus densiflora S. et Z.) with various cooking degree were prepared and were bleached with NaClO2. Pulp viscosity were measured with cupri-ethylene diamine solution and sugar components were analysed by alditol-acetate method. The following informations were consequently obtained.
    (1) Little carbohydrate was dissolved and pulp viscosity was dropped only a little during bleaching with NaClO2 when kappa no. of Buna UKP was higher than about 21 and kappa no. of Akamatsu UKP was higher than about 84.
    (2) Carbohydrate degradation was obserbed during bleaching with NaClO2 when kappa no. of Buna UKP was lower than about 21 and kappa no. of Akamatsu UKP was lower than about 84.
    (3) The main components of BKP were glucan, xylan in Buna and glucan, xylan, mannan in Akamatsu from analysis by gas chromatography.
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  • Studies on the Technology of Direct Causticizing Process by Ferric Oxide Part 1 Studies on Soda Quinone Pulping
    3-Soda Quinone Pulping Conditions
    Tokiya Yaguchi, Masahiro Sesaki, Katsuhiro Oda, Michihiro Nakura
    1986 Volume 40 Issue 9 Pages 870-876
    Published: September 01, 1986
    Released on J-STAGE: October 27, 2010
    DOIhttps://doi.org/10.2524/jtappij.40.870
    JOURNAL FREE ACCESS
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    Laboratory studies for direct caustcizing process by ferric oxide in soda quinone pulping conditions were carried out in comparison with kraft pulping. DDA (1, 4-dihydro-9, 10-dihydroxy anthracene sodium salt) was used as quinone with addition of 0.1% as AQ by weight on o. d. wood. In the case of soda quinone pulping of Douglas fir, low temp.-long time pulping at the same H-factor and short time-high alkali pulping at the same τ-factor gave the same Kappa number of pulp, but low temp.-high alkali pulping at the same τ-factor gave a slihgtly high Kappa number pulp. By different pulping conditions, pulp yield and pulp properties were slightly different each other. There are not negligible differences in pulp yield and pulp properties at the same Kappa number by three different Douglas fir chip lot from different pulp mills in Japan. Almost same results with previous reports were obtained by the reappearance tests of soda quinone pulping of Douglas fir and eucalyptus at low Kappa number, and tear strength of soda quinone pulp of Douglas fir was ca. 10% lower than KP by statistical analysis.
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  • [title in Japanese]
    1986 Volume 40 Issue 9 Pages 877
    Published: September 01, 1986
    Released on J-STAGE: October 27, 2010
    DOIhttps://doi.org/10.2524/jtappij.40.877
    JOURNAL FREE ACCESS
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