JAPAN TAPPI JOURNAL
Online ISSN : 1881-1000
Print ISSN : 0022-815X
ISSN-L : 0022-815X
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Volume 77, Issue 11
Displaying 1-11 of 11 articles from this issue
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Pulp and Paper Research Conference
  • Report on the 90th Pulp and Paper Research Conference
    Wood Science Committee
    Article type: meeting-report
    2023 Volume 77 Issue 11 Pages 965-973
    Published: 2023
    Released on J-STAGE: December 01, 2023
    DOIhttps://doi.org/10.2524/jtappij.77.965
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  • Building a Cellulosic Biomass Fractionation Industry for a Decarbonized Society
    Kiyohiko Igarashi
    Article type: other
    2023 Volume 77 Issue 11 Pages 974-976
    Published: 2023
    Released on J-STAGE: December 01, 2023
    DOIhttps://doi.org/10.2524/jtappij.77.974
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    Currently, most plastic production from biomass is done either by breaking down the extracted oil and sugar components as they are, or by breaking down the constituent sugar components into monosaccharides, converting them into monomers, and polymerizing them to obtain plastic. In the former case, there is often competition for food, and in the latter case, the conversion process is economically and energy inefficient. Therefore, the goal of this research is to develop technologies to enable cascade utilization of biomass according to its tissue structure and molecular weight. In other words, when unutilized biomass is converted by enzymes, etc., we aim to develop technologies to utilize the parts that tend to remain as fiber, the components that are chemically difficult to decompose as polysaccharides or oligosaccharides, and the parts that are easily decomposed as monosaccharides.
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  • Improving Retention by Optimizing the Charge of Papermaking Materials with Coagulants
    Koichi Tadaki
    Article type: other
    2023 Volume 77 Issue 11 Pages 977-978
    Published: 2023
    Released on J-STAGE: December 01, 2023
    DOIhttps://doi.org/10.2524/jtappij.77.977
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    Various pulp materials used in paper mills vary greatly in fiber length and charge status depending on the type of pulp. Therefore, pretreatment to adjust the charge is necessary in some cases, and in recent years, polymer-based coagulants have been increasingly applied. In this paper, we report on the relationship between the optimization of the charge state and the raw material retention by applying a cationic polymer type coagulant.
    Neutral paper making is the current mainstream, and the alum, which was used for charge adjustment in acidic paper making, is less effective in neutral area. This is due to the fact that the trivalent cationic charge of aluminum decreases with increasing pH. Aluminum ions in the neutral region become hydroxide complex ions and their charge valence decreases. If the anionic charge of the pulp material is too high, the excess charge may interfere with the effect of the retention aid added in the wet end process. In such cases, the addition of a coagulant can neutralize the anionic charge and improve the retention of the raw material, so it is very important to know the state of charge of the pulp material and the state of charge at the wet end.
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  • Effect of Rosin-based Plastic Additives to Improve Physical Properties of Polyethylene/Cellulose Fiber Composites
    Tsubasa Ito
    Article type: other
    2023 Volume 77 Issue 11 Pages 979-980
    Published: 2023
    Released on J-STAGE: December 01, 2023
    DOIhttps://doi.org/10.2524/jtappij.77.979
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    Plastic composites using cellulose as filler have been actively investigated in recent years to enhance the biomass content of molded products. However, polyolefin-based plastics lack affinity with high-polarity fillers due to their low polarity, and there are often issues in terms of physical properties when used as composites. In this study, we applied rosin derivative containing polar groups, a rosin-based resin, as an additive for polyethylene/cellulose fiber composites.
    The results showed that rosin derivative containing polar groups was effective in improving the physical properties of the polyethylene/cellulose fiber composite. Microscopic images suggested that rosin derivative containing polar groups contributed to the improvement of interfacial adhesion between polyethylene and cellulose.
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  • Application of Amphoteric Acrylamide Copolymers as High Performance Papermaking Additives
    Kairi Yamato, Kazuhiro Kumeda
    Article type: other
    2023 Volume 77 Issue 11 Pages 981-983
    Published: 2023
    Released on J-STAGE: December 01, 2023
    DOIhttps://doi.org/10.2524/jtappij.77.981
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    Amphoteric polyacrylamides are utilized as dry strength agents in the papermaking process of the paper industry. The cationic and anionic groups existing in the amphoteric polyacrylamides are known as interaction sites with the pulp that promote the adsorption of amphoteric polyacrylamides onto the pulp fibers. Based on this feature, we investigated the effect of different anionic groups on the properties of amphoteric polyacrylamides and evaluated their performances as papermaking additives. The degree of ionization and the formation of poly-ion complex of the amphoteric polyacrylamides in the aqueous solution were found to change depending on the anionic groups. Furthermore, it was discovered that these paper strength agents with different anionic groups changed their performances in the presence of aluminum sulfate. Notably, the novel amphoteric polyacrylamide in this report is less dependent on the amount of aluminum sulfate used in the papermaking process.
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  • Reduction of Basic Unit by Digester Additive in the Pulp Cooking Process
    Masayuki Kanamura
    Article type: other
    2023 Volume 77 Issue 11 Pages 984-986
    Published: 2023
    Released on J-STAGE: December 01, 2023
    DOIhttps://doi.org/10.2524/jtappij.77.984
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    Due to the current world situation, various prices are rising, so paper manufacturers are required to reduce the basic unit these days. This paper focused on the cooking process of the kraft pulp method, and described the possibility of reducing the unit consumption of pulp production through efficient cooking. The mechanism of action of the Solenis cooking aid was explained and this product was compared with anthraquinone which is a traditional cooking aid. The effectiveness of Solenis’ cooking aid was shown based on two mill trials overseas.
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Topics & Information
  • A Report of the 21st International Symposium on Wood, Fiber, and Pulping Chemistry (ISWFPC) 2023, Venice
    Tomoya Yokoyama, Toshihiro Komatsu, Takao Kishimoto, Tetsuo Kondo, Yas ...
    Article type: meeting-report
    2023 Volume 77 Issue 11 Pages 987-997
    Published: 2023
    Released on J-STAGE: December 01, 2023
    DOIhttps://doi.org/10.2524/jtappij.77.987
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    The International Symposium on Wood, Fiber, and Pulp Chemistry （ISWFPC） has a long history. It has been held every other year since 1981 （Stockholm）, and this year marks the 21st time. The 2021 was postponed due to the pandemic, so it past four years since 2019 （Tokyo）. It was held in Venice from July 4th to 7th, and is headed by Prof. Claudia Crestine, Ca’ Foscari University of Venice. Approximately 200 researchers and students （235 peoples including local staffs） from all over the world, mainly from Europe, participated in 84 oral presentations divided into 3 rooms and in 86 poster presentations into the fields of wood biorefinery, cellulose and lignin （35, 20 and 31, respectively） over 3 days. At the beginning of the first and second days, Dr. John Ralph （USDA, USA） and Prof. Thomas Rosenau （BOKU University, Austria） gave plenary lectures on lignin and cellulose, respectively. The next 22nd symposium in 2025 will be held in Raleigh, headed by Prof. Hasan Jameel of North Carolina State University, USA. This time, it has been decided that Pekanbaru, Indonesia will be the venue for 2027.
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  • Utilizing Robotics for “Smart Inspection/DX” of Factories, Plants, etc.
    Takayuki Kumada, Kenro Tanaka, Sho Hirabaru, Masatoshi Endo
    Article type: other
    2023 Volume 77 Issue 11 Pages 998-1002
    Published: 2023
    Released on J-STAGE: December 01, 2023
    DOIhttps://doi.org/10.2524/jtappij.77.998
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    We provide drone inspections using ELIOS, which allows you to fly safely indoors. There are merits such as improvement of worker safety, improvement of work efficiency, cost reduction of inspection cost, and predictive maintenance by digital data conversion. Starting in 2018, it has been used in more than 200 sites. For example, duct inspections could complete a task that used to take a day in just 30 minutes.
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  • DX in the Process Industry as a Reflection of Contemporary Social Demands
    Tetsushi Iwasaki
    Article type: other
    2023 Volume 77 Issue 11 Pages 1003-1008
    Published: 2023
    Released on J-STAGE: December 01, 2023
    DOIhttps://doi.org/10.2524/jtappij.77.1003
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    This article clarifies the factors of the delay and proposes a direction to expedite of the speed of DX.
    First, the model of DX activity was presented and the points of view were constructed focusing on people as the main body of DX. Then, inhibition was verified based on the dialogue history of 100 people from 61 companies in the process industry.
    The true reason for the lack of speed in DX is that the value-creating activity model has not been established yet. There is potential for improvement through a framework approach.
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  • Consistency and Fiber Morphology
    ―Key Process Factor for Pulp Process Control―
    Kiyoyuki Dohi
    Article type: other
    2023 Volume 77 Issue 11 Pages 1009-1015
    Published: 2023
    Released on J-STAGE: December 01, 2023
    DOIhttps://doi.org/10.2524/jtappij.77.1009
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    Currently, industry got strong pressure from the market because Japan government announced carbon neutral industry by 2050. In Japanese industry, especially material industry, there are several serious potential issues like lack of human resource due to less attractiveness for young people, retirement of baby boomer and the technical transfer. On the other hand, there are bright future in paper industry because paper is excellent material for plastic reduction and new functional material, Cellulose Nano Fiber.
    ABB started following four approaches to cooperate with customer to solve facing issues.
    1) Reliable and high-performance online measurement for Refiner, Wet end control
    2) Cutting-edge fiber analyzer for new material development
    3) Speedy, Safety and high precise paper testing machine
    4) High speed, high precise and reliable automated paper testing machine
    In the paper, 1）Reliable and high-performance online measurement for refiner and wet end control is described. You can understand how ABB L&W online measurement is reliable and how to utilize the measurement data for process optimization.
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