JAPAN TAPPI JOURNAL
Online ISSN : 1881-1000
Print ISSN : 0022-815X
ISSN-L : 0022-815X
Volume 49, Issue 6
Displaying 1-11 of 11 articles from this issue
  • Joji Hashimoto
    1995 Volume 49 Issue 6 Pages 903-910
    Published: June 01, 1995
    Released on J-STAGE: November 16, 2009
    JOURNAL FREE ACCESS
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  • Hiroshi Ayukawa
    1995 Volume 49 Issue 6 Pages 911-919
    Published: June 01, 1995
    Released on J-STAGE: November 16, 2009
    JOURNAL FREE ACCESS
    The fiber orientation is one of most important characteristics of papers, which cause market's troubles of all kind of papers, if it is out of correct ranges.
    The fiber orientations are desired near zero degree. We converted these fiber orientations to the parameter of S/N ratio, and applied this parameter in actual process control.
    We measured fiber orientations of every turnup, and analysised the trend of S/N ratio by the control chart.
    It caught the changes of fiber orientations sensitively, and we could take the correct actions to process.
    By this applications of S/N ratio, we got the stability of process, and we could keep many paper products from out of specifications.
    By the application of S/N ratio to papermaking process, we get the quality advancement of paper products.
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  • Makoto Iwasaki
    1995 Volume 49 Issue 6 Pages 920-930
    Published: June 01, 1995
    Released on J-STAGE: November 16, 2009
    JOURNAL FREE ACCESS
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  • Present Status of Development
    Jukka Lehtinen
    1995 Volume 49 Issue 6 Pages 931-942
    Published: June 01, 1995
    Released on J-STAGE: November 16, 2009
    JOURNAL FREE ACCESS
    Condebelt drying process has been studied since 1975. It has progressed to the point where installation of a production machine is possible. There are three basic configurations of Condebelt drying process to meet individual quality requirement for different board or paper grades. Configurations of Condebelt and quality improvement of different boards are introduced.
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  • [in Japanese]
    1995 Volume 49 Issue 6 Pages 943
    Published: June 01, 1995
    Released on J-STAGE: November 16, 2009
    JOURNAL FREE ACCESS
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  • Zensaku Abe
    1995 Volume 49 Issue 6 Pages 944-950
    Published: June 01, 1995
    Released on J-STAGE: November 16, 2009
    JOURNAL FREE ACCESS
    The AMA (alkali-methanol-anthraquinone pulping) process was invented by Z. Abe of Kyushu University in 1982. The Organocell process was improved and changed to the same pulping process as AMA process. On Sept. 1992, Organocell started up a 150, 000 ton/yr Organocell mill in Germany.
    This investigation was carried out to get a better understanding about AMA. Delignification rates and selectivity in AMA were compared with these in kraft, alkali-methanol, and soda-anthraquinone pulping. Methanol extractives-free wood meal (24-48 mesh) of beech (Fagus crenata) and pine (Pinus densiflora) were used as raw materials. Each pulping was done under the same active alkali charge.
    The results were summarized as follows :
    (1) The delignification rate in AMA was faster than twice of that in kraft pulping.
    (2) Methanol and anthraquinone, respectively, accelerated the delignification in AMA.
    (3) Softwood as well as hardwood as raw materials was easily pulped by AMA.
    (4) The selectivity of AMA was better than that of kraft, alkali-methanol, and soda-anthraquinone pulping.
    (5) AMA process seems to be the best alternative to kraft pulping process.
    (6) The main subjects on AMA process are left as follows ; washing process, bleaching process and sequences, mechanism of delignification and pulping, chemicals recovery process, economic evaluation.
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  • Part I. Influences of basis weight, wet-pressing and calendering
    Hiroshi Kataoka, Shigenori Kuga, Fumihiko Onabe
    1995 Volume 49 Issue 6 Pages 951-955
    Published: June 01, 1995
    Released on J-STAGE: November 16, 2009
    JOURNAL FREE ACCESS
    Newly developed automatic scanning absorptometry (DSA) was employed to investigate the liquid absorption behavior of handsheets prepared with various basis weights, wet-pressing and calendering conditions. While increased basis weight (from 40 g/m2 to 80 g/m2) caused 7-10 fold increases in the Stoeckigt sizing degree, the short-time absorptivity determined by DSA was moderately enhanced by the same change, showing opposite tendencies. The influences of wet-pressing and calendering were also remarkably different for Stoeckigt values and DSA-absorptivity. While linseed oil absorptivity was sensitive to compaction of paper by calendering, the water absorptivity only reflected the change in surface roughness. This behavior confirms that compaction of paper web through calendering is cancelled by reswelling by water.
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  • V-DWCF of Asymmetric Strength for Thickness
    Shigeo Matsushima, Tadashi Yano, Satoru Matsushima
    1995 Volume 49 Issue 6 Pages 956-966
    Published: June 01, 1995
    Released on J-STAGE: November 16, 2009
    JOURNAL FREE ACCESS
    Analysis of the bending stress is performed for double wall corrugated fiberboard (DWFC) with asymmetrical strength distribution along the direction of thickness of the kraft-liner (KL). Relations are investigated between maximum absolute stresses of elements for DWCF (σs1max, σs2max, σk1max, σk2max and σk0max) and shapes for upper KL (Upper KL1, lower KL2 and middle KL0) or semi-chemical corrugated medium (SCP medium : upper CM1 and lower CM2). Obtained results are as follows ;
    (1) Vertical distance h0 from the outer surface of KL2 to the neutral surface of DWFC increases with increasing modulus Ek1 of longitudinal elasticity. thickness TK1 for KL, and thickness Ts1 and waveheight h1 for CM1. It decreases initially and then approaches constant gradually with the increase of wavelength L1 for CM1.
    (2) Stresses in KL and SCP medium are proportional to the distance from the neutral surface to the point interested in. σs1max, σs2max, σk1max, σk2max and σk0max occur at the outermost positions, that is, on the outermost surfaces for CM1, CM2, KL1, KL2 and KL0.
    (3) σs1max decreases remarkably or slowly with the increase of Ts1, Ek1, Tk1, and thickness Tk0 for KL0 but increases with the increase of L1. It increases initially, attains maximum and then decreases gradually with h1. σs2max increases initially, attains maximum and then decreases gradually with of Ek1, Tk1 and Tk0 It decreases with the increase of Ts1 and h1.
    (4) σk1max decreases remarkably with the increase of Ts1, Tk1 and Tk0, but increases with the increase of L1 and Ek1. It also increases initially, attains maximum and decreases gradually with the increase of h1.
    While σk2max decreases with the increase of Ts1 and Tk0, and increases with the increase of L1. But it increases initially, attains maximum and then decreases gradually with the increase of h1, Ek1 and Tk1.
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  • Studies on Decision of Selection Indexes for Quality Breeding of Eucalypt Pulpwood (III)
    Toshihiro Ona, Tetsuya Sonoda, Kazuya Ito, Masaru Shibata
    1995 Volume 49 Issue 6 Pages 967-974
    Published: June 01, 1995
    Released on J-STAGE: November 16, 2009
    JOURNAL FREE ACCESS
    Within-tree variations, whole-tree values and the representative heights for the whole-tree values of lignin content and lignin S/G ratio by thioacidolysis were analysed for Eucalyptus camaldulensis and E. globulus to do quality breeding using an increment core without cutting the tree.
    Within-tree variations of lignin content in both species were very small. In contrast, lignin S/G rations were higher in pith side and upper part of E. camalduensis, and were very different between trees of E. globulus.
    The whole-tree content of lignin and lignin S/G ratio were 23. 2, 21. 8%, and 1.85, 1.71 for E. camaldulensis, and 18.0, 15.3%, and 3.16, 3.78 for E. globulus. Since the whole -tree content of lignin was lower, and that of lignin S/G ratio was higher in E globulus, E. globulus would have higher pulp yield and digestability.
    Representative heights, the whole-tree contents ± 5%, of lignin content and lignin S/G. ratio were calculated below 3.3 m height to consider for sampling of an increment core. The results were 2.32.8 m for E. camaldulensis, and 0.31.8 m and 3.3 m for E. globulus, regardless to the whole-tree height and the difference of within-tree variation of lignin.
    It is expected that whole-tree pulp properties are predicted by the increment core taken from these representative heights.
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  • 1995 Volume 49 Issue 6 Pages 975-985
    Published: June 01, 1995
    Released on J-STAGE: November 16, 2009
    JOURNAL FREE ACCESS
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  • [in Japanese], [in Japanese]
    1995 Volume 49 Issue 6 Pages 986-989
    Published: June 01, 1995
    Released on J-STAGE: November 16, 2009
    JOURNAL FREE ACCESS
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