JAPAN TAPPI JOURNAL
Online ISSN : 1881-1000
Print ISSN : 0022-815X
ISSN-L : 0022-815X
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Volume 46, Issue 5
Displaying 1-12 of 12 articles from this issue
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  • The Current Topics about the Pulp and Paper Industry
    Tatsuo Masuda
    1992 Volume 46 Issue 5 Pages 589-591
    Published: May 01, 1992
    Released on J-STAGE: November 16, 2009
    DOIhttps://doi.org/10.2524/jtappij.46.589
    JOURNAL FREE ACCESS
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  • Prospects and Problems of Paper Science Research in the 1990 s
    Fumihiko Onabe
    1992 Volume 46 Issue 5 Pages 592-599
    Published: May 01, 1992
    Released on J-STAGE: November 16, 2009
    DOIhttps://doi.org/10.2524/jtappij.46.592
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    At the turning point of the decade of the 80 s to the 90 s, the characteristic changes have emerged : the global environmental issues, the generation alternations of high technology, and the drastic changes in the East-West relations.
    Looking over the recent trends of paper technology and paper research, this paper aims to propose a future direction of paper research in the 90 s.
    The technological trends are taken from Sterling Publications's “World Pulp and Paper Technology” for the year 1990, 91, and 92. The research trends are taken mainly from the “Fundamental Research Symposium” in 1989 together with Tappi meeting's proceedings of 1991.
    To maintain international competitiveness of paper industry under so-called borderless trade conditions of the 90 s, the technological superiority is vitally important.
    Two major objectives of technological developments in the 90 s are higher production efficiency and higher products quality.
    For that purpose, the image of paper industry has to be changed and the young and excellent engineers and scientists have to be recruited.
    The areas of fundamental research of paper science accessible by university laboratory up to now are paper chemistry, paper physics, and coating science, etc.
    The historical development and a future direction of the Paper Science Laboratory of the University of Tokyo is introduced together with the present status of its activity.
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  • The situation on the cross direction control for paper machines
    Hidenori Iida
    1992 Volume 46 Issue 5 Pages 600-612
    Published: May 01, 1992
    Released on J-STAGE: November 16, 2009
    DOIhttps://doi.org/10.2524/jtappij.46.600
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  • Refiner Engineering for Todays Paper Making
    Eiji Tsuruzono, Kokichi Maedera, Toshikazu Miura
    1992 Volume 46 Issue 5 Pages 613-631
    Published: May 01, 1992
    Released on J-STAGE: November 16, 2009
    DOIhttps://doi.org/10.2524/jtappij.46.613
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    Paper has its own physical characteristic required for each type of paper grade. So it is necessary to treat the fibers in order to give the suitable physical characteristic to it for each type of paper in the stock preparation process.
    This process consists of the following steps : (1) Pulping (2) Refining (a kind of beating) (3) Mixing of stocks and (4) Addition of filler, dyes and chemicals etc., and refining is the most effective for improving the fiber guality. That means the refining is the main part in the stock preparation process because of settling the paper quality.
    Therefore, the people relative to the stock preparation system should do the best for refining.
    Refining is the process to prepare the stock for paper making and to make the stock suitable for the final product of paper by giving a machanical action to the stock, i. e. pulp, and has the effect on both paper quality and operating cost.
    As the paper machine has developed into higher speed and larger, because of satisfying the higher-productility and mass-production generation, the refiner (originated as beater) has developed into Double Disk Rifiner suitable for higher efficiency and mass-production.
    This article introduces the Double Disk Rifiner mainly used at present and explains about its design concept, operating mechanism and how to consider the refining technology including operating data.
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  • Technology and Operating Results in the Manufacture of High Quality Two-Layer Tissue Paper
    M. Francese, R. Bluhm
    1992 Volume 46 Issue 5 Pages 632-637
    Published: May 01, 1992
    Released on J-STAGE: April 23, 2010
    DOIhttps://doi.org/10.2524/jtappij.46.632
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    This is a translation of the captioned paper jointly presented at the Tissue Symposium held in Munich, Germany on April 17, 1991.
    Multi-layer tissue production can control the paper quality with more flexibility than the conventional technology. The structure of the headbox as well as the operating results at the papermill are introduced.
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  • Ishinomaki Mill, Jujo Paper Co., Ltd.
    1992 Volume 46 Issue 5 Pages 638-643
    Published: May 01, 1992
    Released on J-STAGE: November 16, 2009
    DOIhttps://doi.org/10.2524/jtappij.46.638
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  • General Instrumental Analyses in Pulp and Paper Research (II)
    Application of Nuclear Magnetic Resonance
    Akira Isogai
    1992 Volume 46 Issue 5 Pages 644-648
    Published: May 01, 1992
    Released on J-STAGE: November 16, 2009
    DOIhttps://doi.org/10.2524/jtappij.46.644
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  • [title in Japanese]
    [in Japanese]
    1992 Volume 46 Issue 5 Pages 651
    Published: May 01, 1992
    Released on J-STAGE: November 16, 2009
    DOIhttps://doi.org/10.2524/jtappij.46.651
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  • Studies on Flow Properties of Coating Colors. V
    Effect of pH on Interaction between Constituent Particles in Coating Color
    Yong-Kyu Lee, Shigenori Kuga, Fumihiko Onabe, Makoto Usuda, Kenzo Miya ...
    1992 Volume 46 Issue 5 Pages 652-659
    Published: May 01, 1992
    Released on J-STAGE: November 16, 2009
    DOIhttps://doi.org/10.2524/jtappij.46.652
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    The interaction affecting the surface charge of constituent particles in coating color was studied through electrophoresis measurement and scanning electron microscopy (SEM) with the technique of osmium tetroxide fixation of latex.
    The pH dependence of aggregation state of amphoteric latex, which has both anionic and cationic groups, was visualized by SEM. Charge reversal of amphoteric latex and satin white by pH control affects significantly the dispersion state and electrokinetic properties of coating color. The transition pH for the dispersion state of amphoteric latex was ca. 7.1, showing some inconsistency with the electrophoretic behavior, which seemed to result from the relative strengths of electrostatic repulsion and Van der Waals attraction between latex particles. In the three-component system consisting of amphoteric latex/anionic latex/clay, the amphoteric latex mediates the binding between anionic latex and clay. This phenomenon might be useful in preventing the binder migration in actual coating procedures.
    The pH of charge reversal of satin white was ca. 7.5 as determined by electrophoresis. The coagulation behavior of latex particles onto satin white, as observed by SEM, clearly showed the role of this charge reversal : both types of latices were more uniformly distributed under alkaline conditions than under acidic conditions. In the latter condition, however, the difference between the two latices was not remarkable as expected.
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  • Observation of Change of Interfiber Pores due to Swelling
    Change of Paper Structure due to Swelling during Water Penetration into Paper II
    Yuji Matsuda, Shigenori Kuga, Fumihiko Onabe, Makoto Usuda
    1992 Volume 46 Issue 5 Pages 660-667
    Published: May 01, 1992
    Released on J-STAGE: November 16, 2009
    DOIhttps://doi.org/10.2524/jtappij.46.660
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    Paper structure before and after water swelling was studied by means of mercury porosimetry and scanning electron microscopy. The structures of dried handsheets made of hardwood and softwood were cpmpared to those of the reswollen/freeze-dried handsheets. The micrographs obtained were analyzed by image processing for evaluating cross-sectional areas of fibers and pores. The increase in interfiber volume due to swelling was reduced at higher degrees of beating. The pore size distribution of swollen sheet was shifted toward larger pore size region, maintaining its original shape. The ratio of increase in thickness was ca. 1.5 for all samples, irrespective of degree of beating or type of pulp. Micrographs showed that the increase in thickness was caused by separating of interfiberbonding and expansion of interfiber pore spaces resulting from water penetration into interfiber bonding areas.
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  • Elastic Strength of CF under the Uniform Bending about the Moment Axis in the Machine Direction II
    Symmetric Strength for Thickness
    Shigeo Matsushima, Tadasi Yano, Akira Matushima, Toshiaki Yokota
    1992 Volume 46 Issue 5 Pages 668-678
    Published: May 01, 1992
    Released on J-STAGE: November 16, 2009
    DOIhttps://doi.org/10.2524/jtappij.46.668
    JOURNAL FREE ACCESS
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    The relations are analyzed among the strengths of single, double wall corrugated fiberboards (SCF, DCF) and their shape and material model. Strength efficiencies Efs (strength per unit mass for the semichemical corrugated medium (SCP medium)) and Efk (strength per unit mass for the kraft liner (KL)) are also discussed. Obtained results are as follows;
    (1) The maximum value of absolute sterss σsmax for SCP medimum occurs at the contact positions of KL with SCP medium. The maximum value of absolute sterss σkmax for KL occurs on the surface of KL. σkmax is larger than σsmax.
    (2) σsmax and σkmax for SCF decrease as the thickness Ts (for SCP medium), thickness Tk (for KL) or height h of the corrugation increase. They increase as the wave length L of the corrugation increases.
    (3) σsmax for SCF decreases, but σkmax for SCF increases with the increase of the longitudinal elastic modulus Ek for KL. σsmax and σkmax increase as Tk increases.
    (4) Efs for SCF decreases with increasing Ts, but increases with increasing L or h. Initially Efk decreases, then increases gradually depending on Tk.
    (5) It is suitable to select as large value of h as possible for DCF.
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  • [title in Japanese]
    1992 Volume 46 Issue 5 Pages 679-687
    Published: May 01, 1992
    Released on J-STAGE: November 16, 2009
    DOIhttps://doi.org/10.2524/jtappij.46.679
    JOURNAL FREE ACCESS
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