JAPAN TAPPI JOURNAL
Online ISSN : 1881-1000
Print ISSN : 0022-815X
ISSN-L : 0022-815X
Volume 53, Issue 8
Displaying 1-17 of 17 articles from this issue
  • Compact Dispersion System
    Kazuya Komura, C. Thummler
    1999 Volume 53 Issue 8 Pages 969-977,031
    Published: August 01, 1999
    Released on J-STAGE: November 29, 2010
    JOURNAL FREE ACCESS
    In this paper we will focus on Dispersion as one of the key subsystems. As thickening and heating are integral part of the dispersion process both will be included in this paper. First we will discuss some theoretical aspects on dispersion, followed by an introduction of the Compact Dispersion System. Emphasize will be put on the application of the theory on machine design and system set-up. Results achieved with this system in our pilot plant and in papermills will be presented. Considerations on the position of a disperser in a deinking system will conclude the paper.
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  • Anders Dahl
    1999 Volume 53 Issue 8 Pages 978-984,031
    Published: August 01, 1999
    Released on J-STAGE: November 29, 2010
    JOURNAL FREE ACCESS
    Three different ClO2 processes are compared basicaliy including following parameters:
    1. Consumption of raw materials and utilities
    2. Production of by-products
    3. Product quality
    4. Operational characteristics
    5. Process features
    6. Costs of operation and investment
    The selected processes are:
    1. SVP-LITE®/R 8, methanol based process, world-wide the most common process used today.
    2. HP-ATMprocess, peroxide based process, of special interest in Japan because of easy conversion and capacity expansion from existing R 2/Mathieson plants
    3. Integrated process, where ClO2generation is integrated with chlorate electrolysis an hydrochloric acid production
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  • Masakatsu Watanabe, Kunihiko Matsushima, Fumie Chigira
    1999 Volume 53 Issue 8 Pages 985-991,032
    Published: August 01, 1999
    Released on J-STAGE: October 27, 2010
    JOURNAL FREE ACCESS
    Recently, for the internal sizing, the rosin emulsion sizes are often used. There are two types of rosin emulsion size corresponded to the acidic conditions and the higher pH conditions. For the latter, the rosin ester-type emulsion sizes are well known. The sizing performance of this type is not satisfactory at near neutral conditions, because of the dependence upon the amount of alum used. The high performance rosin emulsion size, more reasonable price and easier to use than AKD and ASA, is required, under neutral papermaking is advanced in order to improve the quality of paper and reduce the cost. We investigated a new size in terms of the components of resin and the ionicity of polymer surfactant, and found that the size, formed by dispersing the fortified rosin and petroleum resin mixture with a cationic surfactant, is excellent in comparison with rosin-ester size.
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  • OptiConcept
    Yasuhiro Hatano
    1999 Volume 53 Issue 8 Pages 992-998,032
    Published: August 01, 1999
    Released on J-STAGE: October 27, 2010
    JOURNAL FREE ACCESS
    Paper making is a chain of process where every parts plays its own role. The future development targets of paper making have presented several challenges from headbox to reel. Here we introduced new OptiConcept. This New Concept will give the paper industry great economic benefits in many paper machines in the new century.
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  • Riyuki Yuasa, Kazunari Karasawa
    1999 Volume 53 Issue 8 Pages 999-1006,032
    Published: August 01, 1999
    Released on J-STAGE: October 27, 2010
    JOURNAL FREE ACCESS
    There are a large number of and a wide range capacity of AC motors and AC drives applied in pulp and paper industries. Constant speed motors are used for pumps, fans and blowers. However, recently adjustable speed drives can be applied for medium voltage motors.
    This article describes the energy savings effect, introducing high efficiency motors and medium voltage inverters, for saving energy and operation cost reduction.
    It is also important to check the insulation condition of medium voltage AC motors to maintain the motor characteristics. The latest technology of dielectric diagnosis for the motor insulation is also described.
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  • Toshio Hinago
    1999 Volume 53 Issue 8 Pages 1007-1014,033
    Published: August 01, 1999
    Released on J-STAGE: October 27, 2010
    JOURNAL FREE ACCESS
    Recent development of printing technology requires high quality printing paper. Modern paper mills have high-speed coaters which usually operate around 1, 500 m/min for productivity inprovement. We have developed a modified starch suitable for high-speed coating. It can be prepared with higher solid coating color formulation than usual starch. Coated paper quality, including such as paper gloss etc., is improved. Also offset printabilities, including such as ink receptivity and trapping mottle etc., are improved. Since we have marketed this product, I would like to explain details of our product development effort and its applications.
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  • Saboro Hayano, Koji Takano, Kazunori Kamada, Manabu Teramoto, Toshihar ...
    1999 Volume 53 Issue 8 Pages 1015-1023,033
    Published: August 01, 1999
    Released on J-STAGE: October 27, 2010
    JOURNAL FREE ACCESS
    The development of print gloss immediately after printing was examinated by Dynamic Gloss-Meter (DGM) and CCD camera, and was found to be substantially in close relation with the change of surface roughness of ink layer which result from the generation of the split pattern on printing, followed by its leveling process. The influence of the structural factors of coated layer (i. e. surface roughness, pore size and porosity, etc.) on the leveling process will be reported and discussed.
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  • Introduction of TNT, TNT-C Reel
    Katsuhiko Michiura
    1999 Volume 53 Issue 8 Pages 1024-1030,034
    Published: August 01, 1999
    Released on J-STAGE: October 27, 2010
    JOURNAL FREE ACCESS
    It has been confirmed theoretically and experimentally that a center winding reel is effective to wind larger diameter paper roll without wrikle or burst of the sheet. MHI products two types center winding reels and these names are TNT reel and TNT-C reel.
    The TNT reel has the basic concept that is even and steady for paper winding. During operation, the spool moves only on the level rail without the transfers of torque and nip. The first domestic TNT reel has been installed to wind the super calendered paper and is operating successfully.
    The TNT-C reel has the structure of conventional surface reel added primary and secondary center wind equipment. Therefore a conventional reel can be rebuild easily to the TNT-C reel.
    The TNT-C reels in Japan are operating well and winding larger diameter paper roll than conventional reel.
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  • Seizo Nakano
    1999 Volume 53 Issue 8 Pages 1031-1033,034
    Published: August 01, 1999
    Released on J-STAGE: October 27, 2010
    JOURNAL FREE ACCESS
    Calendering is the final step in paper manufacturing and is vital for the improvement of paper quality. Although most paper mills use the lower-temperature calendering roll, it is possible to reduce better quality paper by high temperature calendering.
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  • Kiyoyuki Egusa
    1999 Volume 53 Issue 8 Pages 1034-1037,035
    Published: August 01, 1999
    Released on J-STAGE: October 27, 2010
    JOURNAL FREE ACCESS
    The direct dilution method in the head box combined with the consistency profiling equipment has been introduced recently in order to improve the CD profile. There are 30 to 150 pieces of narrow tubes in the CP equipment. Deposits caused mainly by microorganisms, including bacteria, fungi and yeast which collect inside of these tubes, which proliferate, and then fall off the tubes when the deposit grows up to a certain size causes peculiar problems to the CP equipment such as speckles and breaks. As a kind of deposit control agent, slime control chemicals have been dosed into the first white water circulating lines. White water is circulated and concentrated haevily in the line, and the concentration of slime control chemicals are maintained. But white water in the CP line isn't circulated, so the countermeasure for the deposit problem becomes critical. Therefore we have developed a monitoring system for the CP. We then screen for the optimum slime control chemical. Using this data we have established the optimum dosing method and as a result, we now can control deposit problems.
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  • Tomoyuki Iwamori
    1999 Volume 53 Issue 8 Pages 1038-1041,035
    Published: August 01, 1999
    Released on J-STAGE: October 27, 2010
    JOURNAL FREE ACCESS
    Supercritical water (over 374 centigrade and 22 MPa) has so high solubility for oraganic and oxgen that they are consist in homogeneous phase, So it is very easy to oxidize oragnic compounds. Furthermore, in supercritical water both hydrolysis and pyrolysis are occurred, so SCWO (super critical water oxidation) process has high decomposition ability for organic compounds.
    We have already operated the SCWO pilot-scale plant which has the capacity of up to 2 ton/day since 1995. Using this plant, we have demonstrated to decompose various chemicals safely and completely. In this report, it is also demonstrated that papermaking wastes were completely decomposed by SCWO.
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  • [in Japanese]
    1999 Volume 53 Issue 8 Pages 1042
    Published: August 01, 1999
    Released on J-STAGE: October 27, 2010
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1999 Volume 53 Issue 8 Pages 1043
    Published: August 01, 1999
    Released on J-STAGE: October 27, 2010
    JOURNAL FREE ACCESS
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  • Nobuo Yamada, Tokiya Yaguchi, Haruo Sato, Masao Sudoh
    1999 Volume 53 Issue 8 Pages 1046-1053,036
    Published: August 01, 1999
    Released on J-STAGE: October 27, 2010
    JOURNAL FREE ACCESS
    Hydrogen peroxide is known as one of the important chemicals for pulping due to its excellent ability to bleach without formation of chlorinated organic compounds, which contributes to the good environment. This study was, therefore, carried out to develop on-site type electrochemical hydrogen peroxide production system that enables to produce hydrogen peroxide easily by cathodic reduction of oxygen, with easy enlarging the capacity.
    The operating conditions were investigated using the laboratory cell in this study. Continuous operating conditions were investigated and the intermittent blowing of dry oxygen gas was clarified to be effective to the stable operation. Averaged current efficiency of 84.5% was obtained at 600 A/m2 for 600 hrs of continuos operation.
    PSA oxygen was confirmed to be a practical oxygen source for the on-site production of hydrogen peroxide. The dosage of ethylenediaminetetra-acetic acid salt (EDTA) into anolyte improved the current efficiency from 85.3% to 94.4% and kept the operation stable without any deterioration of ion exchange membrane.
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  • Degradation of 2, 4, 8-trichlorodibenzofuran and dibenzofuran by some fungi having ability for degradation of dioxins
    Hiroki Ohkawa, Kazutaka Itoh, Sanro Tachibana
    1999 Volume 53 Issue 8 Pages 1054-1062,036
    Published: August 01, 1999
    Released on J-STAGE: October 27, 2010
    JOURNAL FREE ACCESS
    Microbial degradation of 2, 4, 8-trichlorodibenzofuran (2, 4, 8-TCDF) and dibenzofuran by three fungi (563, V1, V2) isolated by a screening method from natural world and by two wood-rotting fungi (Phanerochaete chrysosporium and Coriolus versicolor) were conducted. The five fungi degraded from 1.9% to 75.9% of 2, 4, 8-TCDF. The maximum degradation ratio of 2, 4, 8-TCDF was obtained by fungus V 1 when the incubation was conducted for 15 days after addition of 1.25 mMol of 2, 4, 8-TCDF to culture medium of each of five fungi. The degradation ratio was 36.2%. In the case of the 30 day's incubation in the same concentration, the maximum degradation ratio was obtained by P. chrysosporium. The degradation ratio was 75.9%. On the other hand, the maximum degradation ratio of 2, 4, 8-TCDF was obtained by C. versicolor when the incubation was conducted for 15 days after addition of 0.25 mMol of 2, 4, 8-TCDF to culture medium of each of five fungi. The degradation ratio was 36.4%. In the case of the 30 day's incubation in the same concentration, the maximum degradation ratio was obtained by fungus V2. The degradation ratio was 72.8%. In addition, a part of 2, 4, 8-TCDF was incorporated into each mycelium of five fungi during the incubation.
    Dibenzofuran (DF) could be degraded from 80.6% to 94.5% by P. chrysosporium and fungus V2. The maximum degradation ratios of DF was obtained by fungus V2 when the incubations were conducted for 15 days and 30 days, respectively, after addition of 1.25 mMol of DF to culture medium of each of two fungi. The degradation ratios were 91.7% and 94.5%, respectively. On the other hand, the maximum degradation ratios of DF were obtained by fungus V2 when the incubations were conducted for 15 days and 30 days, respectively, after addition of 0.25 mMol of DF to culture medium of each of two fungi. The degradation ratios were 88.3% and 93.6%, respectively. In addition, a part of DF was incorporated into each mycelium of two fungi during the incubation. In comparison with the degradation ratio between 2, 4, 8-TCDF and DF, it is considered that the degradation ratio of chlorinated DF decrease with the numbers and positions of substituted chlorine atoms at the DF molecule.
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  • 1999 Volume 53 Issue 8 Pages 1063-1069
    Published: August 01, 1999
    Released on J-STAGE: October 27, 2010
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1999 Volume 53 Issue 8 Pages 1070-1071
    Published: August 01, 1999
    Released on J-STAGE: October 27, 2010
    JOURNAL FREE ACCESS
    Download PDF (331K)
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