JAPAN TAPPI JOURNAL
Online ISSN : 1881-1000
Print ISSN : 0022-815X
ISSN-L : 0022-815X
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Volume 42, Issue 3
Displaying 1-8 of 8 articles from this issue
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  • High performance paper in the perspectives of “paper” industries
    Hiroshi Inagaki
    1988 Volume 42 Issue 3 Pages 227-236
    Published: March 01, 1988
    Released on J-STAGE: November 16, 2009
    DOIhttps://doi.org/10.2524/jtappij.42.227
    JOURNAL FREE ACCESS
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  • Bacterial Cellulose
    Mitsuo Takai
    1988 Volume 42 Issue 3 Pages 237-244
    Published: March 01, 1988
    Released on J-STAGE: November 16, 2009
    DOIhttps://doi.org/10.2524/jtappij.42.237
    JOURNAL FREE ACCESS
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  • Measurement Technologies on Printing Machines
    Shigetomo Yoshijima, Hiroyuki Nakamura
    1988 Volume 42 Issue 3 Pages 245-254
    Published: March 01, 1988
    Released on J-STAGE: November 16, 2009
    DOIhttps://doi.org/10.2524/jtappij.42.245
    JOURNAL FREE ACCESS
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    Various kind of measurement technologies, or automatic control technologies on printing machines, are recently developed and presented by printing machineries, in order to improve the rate of operation for the printing machine. This paper describes an outline on electronic ink control systems, automatic dampening water control systems, automatic preset registration systems, automatic print quality inspection systems and so on.
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  • Integrated Information System within the Pulp Mill at Tomakomai
    Hidetoshi Kaminaga
    1988 Volume 42 Issue 3 Pages 255-260
    Published: March 01, 1988
    Released on J-STAGE: November 16, 2009
    DOIhttps://doi.org/10.2524/jtappij.42.255
    JOURNAL FREE ACCESS
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    Recently, mill wide information and control systems are gradually promoted in the pulp and paper industry in Japan. Oji Paper has installed and started up an integrated information system for the large-scale and complex pulp plant at its Tomakomai Mill. This system provides effective information to achieve higher quality and productivity, in the use of a super mini-computer with the real time linear programming technique, the relational data base and so forth. The system also has close connection with other systems such as the optimum energy management system, and lays the foundations for the mill wide system.
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  • Effect of Refining on Vessel Picking
    Prevention of Vessel Picking Trouble in Tropical Hardwood Pulps IX.
    Hiroki Nanko, Shun-ichiro Mukoyoshi, Junji Ohsawa
    1988 Volume 42 Issue 3 Pages 267-274
    Published: March 01, 1988
    Released on J-STAGE: February 09, 2010
    DOIhttps://doi.org/10.2524/jtappij.42.267
    JOURNAL FREE ACCESS
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    Effect of refining on the reduction of vessel picking of hardwood pulp sheet was investigated.
    Vessel elements are broken into small pieces by refining, so that the proportion of large vessel elements decreases and that of small fragments increases. Especially high consistency refining is effective for vessel element destruction and it can reduce large vessel content considerably. Regardless of refining methods, the destruction of vessel elements reaches certain level at CSF 400 ml, and further refining gives only small change in size and number of vessel elements.
    Result of printing test showed that vessel pick number tends to decrease with reduction of total projected area of vessel elements contained in a given amount of pulp. Larger vessel elements have higher tendency to be picked than smaller ones.
    To evaluate vessel-fiber bonding strength, two-layered handsheets were prepared using JPRIMulti-Head with Buna (beech) pulp as under layer and fractionated Lauan vessel elements on the top layer. With increasing refining of Buna pulp, picking of Lauan vessel elements decreased considerably, whereas refining of vessel elements had small effect on vessel pick reduction.
    In conclusion, vessel picking reduction by refining is achieved by the following factors ; (1) the reduction of vessel size, especially decrease of large vessel element content, (2) improvement of vessel element-fiber bonding by the improvement of conformability of fibers against vessel elements.
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  • A Study of Production of CTMP from Hardwood
    Part 1. Physical Properties of CTMP produced from Sulfite-pretreated Hardwood Chips
    Yasuo Kojima, Seung Lak Yoon, Tsutomu Kayama, Masashi Horino, Masafumi ...
    1988 Volume 42 Issue 3 Pages 275-286
    Published: March 01, 1988
    Released on J-STAGE: February 09, 2010
    DOIhttps://doi.org/10.2524/jtappij.42.275
    JOURNAL FREE ACCESS
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    A study has been carried out to determine the influence of chemical pretreatments on the physical properties of chemithermomechanical pulps (CTMP) made from hardwood chips which were chemically treated with sulfite liquors at the range from pH 1.8 to 13.0.
    Of the chemical pretreatments investigated, neutral sulfite (pH 9.8) and bisulfite (pH 4.1) appeared to offer the greatest potential for strength development to produce CTMP from hardwood chips. Alkaline sulfite (pH 13.0) and acid sulfite (1.8) treatment, on the other hand, have little effect on the strength properties of CTMP.
    As far as energy requierment is concerned, pretreatment with sulfite liquor at low pH (4.11.8) leads to a substantial reduction in refining energy. However, there are distinct differences in the long fiber contents between acid sulfite CTMP and bisulfite CTMP. In the case of acid sulfite-and bisulfite-pretreatments, The strength properties of CTMP from birch wood were higher than those of CTMP from oak wood.
    The ultraviolet microscope was used to follow the delignification visually during acid sulfite-and bisulfite-pretreatment of birch wood. When the birch wood was delignified with bisulfite, the topochemical effect was not detected, while topochemical preference for the removal of lignin from the secondary wall was found in the case of acid sulfite-pretreatment.
    Furthermore, it was found that total pore volume and median pore width of cell wall treated with bisulfite was larger than that of cell wall treated with acid sulfite.
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  • Research and development of high consistency forming (1)
    Evaluation of the flocculation and flowing characteristics of pulp
    Nobuo Takeuchi, Fumio Niwa, Saburo Yoshimura, Tadayoshi Nomura
    1988 Volume 42 Issue 3 Pages 287-294
    Published: March 01, 1988
    Released on J-STAGE: February 09, 2010
    DOIhttps://doi.org/10.2524/jtappij.42.287
    JOURNAL FREE ACCESS
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    An instrument termed concentric cylinder viscometer has been made for evaluating the flowing characteristics and the fibre flocculation of pulp suspension.
    Fluidity of pulp suspension is estimated from the relations between the tangential velocities and the wall shear stresses exerted on the surface of inner cylinder. On the other hand, fiber flocculation is measured by detecting variation in the intensity of light transmitted through the flowing pulp suspension.
    This paper presents the applications of the instrument to the measurement of fluidity and flocculation in various consistencies of bleached hardwood and softwood sulfate pulp suspensions.
    Furthermore, beating effects on the flocculation and the effects of deflocculant (anionic polyacrylamide) on the fluidity and flocculation of 3% hardwood pulp suspension are briefly described taking account of high consistency forming.
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  • [title in Japanese]
    1988 Volume 42 Issue 3 Pages 296-297
    Published: March 01, 1988
    Released on J-STAGE: November 16, 2009
    DOIhttps://doi.org/10.2524/jtappij.42.296
    JOURNAL FREE ACCESS
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