JAPAN TAPPI JOURNAL
Online ISSN : 1881-1000
Print ISSN : 0022-815X
ISSN-L : 0022-815X
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Volume 44, Issue 10
Displaying 1-8 of 8 articles from this issue
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  • The Effect of the Tropical Forest Ecosystem on Changes of CO2 in the Atmosphere
    Hiroshi Koizumi
    1990 Volume 44 Issue 10 Pages 1061-1066
    Published: 1990
    Released on J-STAGE: November 19, 2009
    DOIhttps://doi.org/10.2524/jtappij.44.1061
    JOURNAL FREE ACCESS
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    The effect of deforestation or reforestation in the tropics on changes of CO2 in the atmosphere was investigated. The deforestation area in the tropics was estimated as 1, 100 to 2, 000 × 10 4ha per year, and consequently the amount of carbon released annually would be 22 to 44 × 108 ton. On the other hand, estimating the total carbon removed from the atmosphere during the period of recovery of the forests, the increment of storage of carbon amounted to 300 ton/ha during 35 years or 8.7 ton/ ha per year.
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  • Precipitated Calcium Carbonate for Paper Industry
    Tetsuo Kumasaka, Kazuhisa Shimono, Hiroichi Tanaka
    1990 Volume 44 Issue 10 Pages 1067-1077
    Published: 1990
    Released on J-STAGE: November 19, 2009
    DOIhttps://doi.org/10.2524/jtappij.44.1067
    JOURNAL FREE ACCESS
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    Precipitated calcium carbonate (PCC) for paper industry has increased as the transition of paper making demand. In recent years, PCC has been required stable supply and quality of product according to establish of new coating machine and remodel to paper making machine. This article give an outline of properties, manufacturing method and new type of PCC.
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  • A Report of 1990 TAPPI Coating Conference
    Saburo Hayano
    1990 Volume 44 Issue 10 Pages 1078-1091
    Published: 1990
    Released on J-STAGE: November 19, 2009
    DOIhttps://doi.org/10.2524/jtappij.44.1078
    JOURNAL FREE ACCESS
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  • Measurement of Gloss Profile
    Hideki Fujiwara, Chizuru Kaga, Isao Kano
    1990 Volume 44 Issue 10 Pages 1092-1098
    Published: 1990
    Released on J-STAGE: November 19, 2009
    DOIhttps://doi.org/10.2524/jtappij.44.1092
    JOURNAL FREE ACCESS
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    Gloss distribution of coated paper was measured using a newly developed apparatus which had a 75 degree light source, a 75 degree detector and a scanning X-Y stage. The gloss profile of commercial coated papers was measured with the apparatus. A good correlation between the standard deviation of sheet gloss and the visual rating of the sheet appearance was obtained. The coated paper samples, whose standard deviation of sheet gloss were close to 2%, were evaluated as poor in appearance by most people. The coating profile, the surface latex concentration profile using ultraviolet method, and the sheet gloss profile were compared with coated paper samples in laboratory scale. The high coat weight parts of a coated paper sample showed high surface latex concentration and high gloss, and vice versa. The results obtained suggested the importance of gloss profile as well as surface binder profile for the study of mottling mechanisms.
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  • Hitachi Zosen-Escher Wyss New Approach of Deinking Technology
    Kunio Miyagawa
    1990 Volume 44 Issue 10 Pages 1099-1115
    Published: 1990
    Released on J-STAGE: November 19, 2009
    DOIhttps://doi.org/10.2524/jtappij.44.1099
    JOURNAL FREE ACCESS
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    The development of deinking technology has been continued to adapt to the change of waste paper quality, for example, new printing methods, the limitation of water usage and so on.
    On the course of the development, Sulzer Escher Wyss, West Germany has made the efforts to offer the new concepts, the high consistency slot-screening, the split-flotation, the disperger bleaching, the combi-bleaching, the back water clarification.
    In this paper, the present status and new approach of the important elements for the deinking system are summarized and the modern equipment from Sulzer Escher Wyss are introduced. The future systems are also offered and the trial results of office-waste paper deinking are introduced. A deinking plant with Sulzer Escher Wyss's new concept is in course of construction for the office-waste in Denmark.
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  • [title in Japanese]
    [in Japanese]
    1990 Volume 44 Issue 10 Pages 1124
    Published: 1990
    Released on J-STAGE: November 19, 2009
    DOIhttps://doi.org/10.2524/jtappij.44.1124
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  • Evaluation of Deterioration Degrees of Book Paper by Measurement of Optical Properties
    Bong-Yong Kim, Akira Isogai, Fumihiko Onabe, Makoto Usuda
    1990 Volume 44 Issue 10 Pages 1126-1130
    Published: 1990
    Released on J-STAGE: November 19, 2009
    DOIhttps://doi.org/10.2524/jtappij.44.1126
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    Optical properties of book paper were measured to evaluate deterioration degrees of books stored in our Faculty Library. About 1, 500 books published in Japan for the past hundred year (1880-1980) were sampled, and the brightness, yellowness, ΔE and K/S values were measured. In these values, a linear relationship between K/S values and root of storage time was obtained, and the storage time of a book can be estimated from its K/S value by using the discoloration rate constant of book paper obtained from the slope of the above line. This optical and non-destructive method can be applied for evaluation of deterioration degrees of book paper.
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  • [title in Japanese]
    1990 Volume 44 Issue 10 Pages 1131-1136
    Published: 1990
    Released on J-STAGE: November 19, 2009
    DOIhttps://doi.org/10.2524/jtappij.44.1131
    JOURNAL FREE ACCESS
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