JAPAN TAPPI JOURNAL
Online ISSN : 1881-1000
Print ISSN : 0022-815X
ISSN-L : 0022-815X
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Volume 43, Issue 3
Displaying 1-8 of 8 articles from this issue
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  • Formation Analysis of Paper
    An Approach to the Characterization of Fiber Flocs
    Makio Hasuike
    1989 Volume 43 Issue 3 Pages 263-275
    Published: March 01, 1989
    Released on J-STAGE: November 16, 2009
    DOIhttps://doi.org/10.2524/jtappij.43.263
    JOURNAL FREE ACCESS
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    This review article covers the evaluating methods of the formation with a special reference to the structure of fiber flocs.
    Soft x-ray imaging can be used for the analysis of both macro-scale floc structure and micro-scale network structure on mass basis.
    For describing the floc structure, the mass co-occurrence matrix parameters, indicatives of the intensity and size of flocs, are suitable.
    The simultaneous measurements of the local grammage and the network anisotropy in areas smaller than the floc size reveal the characteristics of the variations of the network structure in machine-made paper.
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  • Computerized Tomography of a Paper Roll
    Takanori Miyanishi, Kiyoaki Iida, Hitoshi Sotobayashi
    1989 Volume 43 Issue 3 Pages 276-283
    Published: March 01, 1989
    Released on J-STAGE: November 16, 2009
    DOIhttps://doi.org/10.2524/jtappij.43.276
    JOURNAL FREE ACCESS
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    Paper rolls were analyzed nondestructively by a computerized tomographic (CT) system. The images of cross-sections of paper rolls were shown as faithfully as if they were observed by cutting them. The tomographic image density (CT value) of a cut paper sheet bundle was proportional to its sheet paper density.
    In CD profiles of CT values of paper rolls, each had a different CD profile. A paper roll wound at higher tension has a poor CD profile of CT values, which indicated internal stress concentrated locally in the roll. The macroscale MD profile of CT values coincided well with the basis weight profile. The longrange MD profile of CT values decreased gradually from a surface to a core of a paper roll, which indicated that internal stress decreased from the core to the surfce.
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  • Technical Trend of BCTMP
    Noboru Takeshita
    1989 Volume 43 Issue 3 Pages 284-296
    Published: March 01, 1989
    Released on J-STAGE: November 16, 2009
    DOIhttps://doi.org/10.2524/jtappij.43.284
    JOURNAL FREE ACCESS
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  • Waste-Paper Recycling and Chemicals
    Makoto Hiraoka
    1989 Volume 43 Issue 3 Pages 297-304
    Published: March 01, 1989
    Released on J-STAGE: November 16, 2009
    DOIhttps://doi.org/10.2524/jtappij.43.297
    JOURNAL FREE ACCESS
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  • Tower Packing “TELLERETTE®”
    Yhoichi Shimoi
    1989 Volume 43 Issue 3 Pages 305-311
    Published: March 01, 1989
    Released on J-STAGE: November 16, 2009
    DOIhttps://doi.org/10.2524/jtappij.43.305
    JOURNAL FREE ACCESS
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  • Utilization of Oil-palm Residue and Feature of Pulp & Paper Industry in Malaysia
    Jun Hosokawa, Ryukicki Matsuo
    1989 Volume 43 Issue 3 Pages 312-317
    Published: March 01, 1989
    Released on J-STAGE: November 16, 2009
    DOIhttps://doi.org/10.2524/jtappij.43.312
    JOURNAL FREE ACCESS
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    The production of palm oil in Malaysia is rapidly increasing and attained to 430 million tons in 1985. Our institute are co-operating with Palm Oil Research Institute, Malaysia (PORIM) to utilize oil-palm residue, especially fronds, for the material of pulp and paper. The authers visited PORIM to conduct the research on pulping of oil-palm residue in August, 1988. This review is concerning information of pulp and paper industries in Malaysia, and of pulping method which have been obtained through our joint research for three years.
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  • Relationship between Coating Structure and Print Mottle
    Takao Arai
    1989 Volume 43 Issue 3 Pages 319-328
    Published: March 01, 1989
    Released on J-STAGE: November 16, 2009
    DOIhttps://doi.org/10.2524/jtappij.43.319
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    Print mottle, as a printing defect, is becoming a serious concern for papermakers and printers, due to the increasing demand for high quality printing, to the increase of coating and printing speeds, and to the decrease of coating weight. The intention of this study is to evaluate quantitatively the relationship between print mottle and chemical distribution in the coated paper by the use of image analysis and ESCA analysis. The results are summarized as follows :
    1. A method of obtaining the surface profile of the binder distribution was developed using ESCA with an analyzer slit of 2 mm diameter of effective area.
    2. A quantitative evaluation method for print mottle by image analysis was developed.
    3. Print mottle caused by non-uniform absorption of dampening solution corresponds directly with the non-uniformity of the surface distribution of binders and pigments. And both print mottle and non-uniformity of binder distribution at the coated surface have a scale of 1-3 mm diameter.
    4. Depth profiles of the coated layer show uneven distribution not only of the binder but also the pigments. Also, starch and latex show different distributions in the coated layer.
    5. No clear relationship between z-direction distribution of chemical components and print mottle was detected, and thus, print mottle seems to be independent of the z-directional coating composition.
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  • [title in Japanese]
    1989 Volume 43 Issue 3 Pages 329-333
    Published: March 01, 1989
    Released on J-STAGE: November 16, 2009
    DOIhttps://doi.org/10.2524/jtappij.43.329
    JOURNAL FREE ACCESS
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