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2009 October JAPAN TAPPI JOURNAL


Vol.63 No.10 Abstracts


Technology of Hot Dispersing System and Broke Pulpers

Kaj Trymel
Cellwood Machinery AB

  Paper is a product which all of us are using daily and as raw material and energy prices are increasing it is important to have the correct tools to handle the current situation. KRIMA Hot Dispersion is one important tool in a modern stock preparation plant to achieve this. The target of dispersion is to disperse, distribute, the dirt in the waste paper invisible in an economic and developing way.


The Newest Cleaning Equipments for Dryer Canvas, Press Felt and Wire Fabric

Yoichiro Iwatani
Technical Sales Dept., AIKAWA IRON WORKS CO., LTD.

  In the quality improvement of the product and reduction in costs, it is important to wash the dryer canvas, the press felt, and the wire fabric appropriately. And cleaning equipment is making progress more than before. The latest models are SUPER CLEANER-WET, SUPERCLEANER-DRY, SUMART CLEANER, and FF CLEANER. Here we would introduce the feature of these cleaning equipments and the merit by the introduction.


The Experience of Anaerobic Wastewater Treatment System for Pulp Mill Wastewater

Atsushi Nakano, Akitoshi Akazawa and Doryoku Sekiya
Sumitomo Heavy Industries Environment Co., Ltd.

  The EGSB anaerobic wastewater treatment system is a very competitive method compared with aerobic treatment system because of space and energy saving system. We constructed the Biobed EGSB system in Pulp Mill for the treatment of drain wastewater from KP evaporator and operated over one year. The performance of EGSB system is good as for the removal rate of CODCr is about 90% and gas production rate is over 0.3Nm3/kg-CODCr, then we achieved the aimed energy-saving effect.


Wet-end Control Technology for Environmental Solution

Koichi Tadaki, Tomoko Asada and Kazutaka Kasuga
Technical Dept., Somar Corporation

  Energy and resources saving are important factors in paper machine operation in the recent trend of large-scale high speed machine. Our continues effort to develop retention aids and coagulant gREALIZERh series is aimed at optimization of wet-end by keeping clean operation as well as to improve productivity. During these research and development, we found that the application of wet-end reformer gAXISZh system could (1) reduce wet-end chemical dosage, (2) reduce effluent load, and (3) reduce other environmental load.
  Reduction of sizing agent addition can be achieved by newly developed ASA sizing system gREGSISh. High performance emulsifying agent gREGSIS Eh series gives better fixation of chemicals on pulp fibers, which is the additions effect on top of sizing performance. Development of wet-end chemicals focused on less environmental load is the main feature of Somar Corporation, and its performance is verified through number of machine trials. This report describes effect of our latest paper chemicals.


Andritz New Wash Press AWP

Kanji Hagiwara and Chiaki Kawakami
Andritz K.K.
Johan Sjorberg
Andritz Fiberline Division

  Andritz has developed a brand new AWP Wash Press. Andritz has delivered many new fiberlines as well as total pulp mill and paper mill systems all over the world for the past decades. It has been seen also important and necessary to upgrade the existing production facilities for increasing production capacity, improving efficiency and replacing obsolete equipment. The Andritz AWP Wash press has various advantages as compared with the wash presses on the market today. The AWP Wash press complements the Andritz Drum Displacer (DD Washer) and offers versatile and flexible upgrade solutions to the pulp mills.


Advanced Mini Shoe Press
-Integration of Metso Paper & Domestic Technology-

Timo Pirinen and Jori Onnela
Metso Paper, Inc.
Ichiro Honma
Metso Paper Japan Co., Ltd.

  There are several considerable benefits that support a press section rebuild by replacing a conventional roll press nip with a shoe press. A shoe press will increase dryness after the press section by several percentage units compared to a conventional roll press. The increased web dryness yields numerous significant benefits.
  The press section rebuild scope greatly influences the investment cost. By minimizing the changes to the existing frame structure required to install a shoe press, there will be fewer costs related to machinery and civil work. Machine downtime will be shorter and the machine will go from paper to paper sooner.
  Now, after the Beloit and Mitsubishi acquisitions, the Metso shoe roll with the pocket equipped hybrid shoe will be applied as a standard design. A new mini shoe press rebuild has been introduced for small- and medium-sized paper and board making lines. This rebuild solution makes it possible to boost production with a press rebuild with minimal changes to the press section geometry. Shoe press technology is a standard solution today, with hundreds of successful references worldwide. Its benefits are now within easy reach of a larger group of paper and board makers through the mini shoe press rebuild.
  This paper will discuss the features of the mini shoe press rebuild, and shoe roll technology and its benefits.


For Sound or Noise in Industrial World Part IV
-It Thinks about the Noise as Part of TFO from SKF-

Yasuhiko Yamasaki
Service Division, SKF Japan

  gFor sound or noise in industrial worldh is the forth in this time. It is a compound sound this time. Do you hear the sound of the machine It is sometimes complex. It is limited to distinguish by hearing it by the ear. Separating the compound sound becomes important.


A Brand-new Gamma-ray Level Gauge TH-3000 Can Be Used without any Licence and Controlled Area: Certificated by MEXT

Hiraku Miyashita
Nanogray Inc.

Before 2005 exemption level of sealed gamma-ray (-ray) source activities is 3.7MBq in Japan. Radiation protection regulation of Japan was changed and the exemption level was reduced in 2005. At that time, new certification system was started by the Ministry of Education, Culture, Sports, Science and Technology (MEXT). The certificated equipments can be used without any licence and controlled area. We already took the certifications by MEXT for all -ray density meters, -ray level gauges (point detector type) and -ray level switches. Recently a brand-new certificated product TH-3000; -ray level gauge (rod detector type) is added the line-up. It can be applied level measurement of continuous digester and breaching tower etc.


Parameters Influencing Flexo Printing on White Top Liner Board

Peter Burri, Cathy Ridgway and Joachim Schoelkopf
Research & Technology Services, Omya

  In this study uncoated and coated white top linerboard were compared in flexo printing. The coated white top liner was produced with two different coating formulations using three different application methods; bent blade, rod, metered size press. All samples were calendered under the same conditions and printed using a flexo printing unit at the DFTA Technology Centre at the Stuttgart Media University, Germany. The print quality was compared to the physical properties of the board surface in order to establish a correlation between pore structure and print quality in flexo printing. It was shown that smoothness alone is not sufficient to result in good printability. Two other parameters of interest also need to be considered, these being the contact angle of the coating, which is a measure of the wettability of a surface, and the water absorption speed.


Energy Saving Effect by Automatic Dryer Fabric Stretchers

Makoto Matsushita
KGK Engineering Corp.

  In the paper manufacturing process, wires, felts & canvases (hereinafter as fabrics) are becoming very important components because they are directly related to the paper machine run-ability such as paper quality, production efficiency and yield in addition to the economic factors like chemicals and steam consumption in the uniformity, dewatering and drying processes.
  Recently it has been proved in many paper mills that the fabric tension monitoring & control contributes to save energy cost, especially less steam consumption. We would like to introduce the effect of Erhard+Leimer Elstretcher and its operation results.


A Report on ISWFPC 2009 Conference
-June 15 -17, 2009 at Oslo, Norway-

Yuji Matsumoto (The University of Tokyo), Hiroshi Ohi (University of Tsukuba) and Kunitaka Toyofuku (JAPAN TAPPI)

  ISWFPC 2009 Conference was held in Oslo, Norway on June 15-17, 2009 hosted by PTF (The Technical Association of the Norwegian Pulp and Paper Industry). There were 63 special presentations on 8 sessions and many posters. Reflecting of economic crisis, there were slightly few participants with 170 people from 21 countries in the world. After the symposium, we visited the Borregarrdfs mill which is famous as Bio-Refinery.


How Technological Innovations Changed Newsprint and Its Making Process
-Survey on Technological Developments in Newsprint Production in Japan (PartIV)-

Kiyoaki Iida
Senior researcher in 2007, Center of the History of Japanese Industrial Technology, National Museum of Nature and Science, Executive Director emeritus, Japan TAPPI

  Part one of the series presented a short history of pulp and paper industry, background of selecting the theme and introductory briefing on basic technologies. Part two presented how newsprint and the way of producing it have evolved in the past 60 years, along with fiber source exploitation in 60 years. Part three described how paper machine for new print production developed in the past 60 years.  In this paper, the characteristics of technological development in Japan are discussed, and then are compared with those of other counties.
  The Japanese paper industry has been continuously improving its capability of manufacturing to one of top levels in the world. The capability of manufacturing means to have equipment of high productivity, operate it in high efficiency and manufacture product of excellent cost performance, which is what the Japanese paper industry has done. A culture which has been nurtured in mills and is quite unique in the world has helped the development.
  The capabilities for other technologies such as energy saving (highest efficiency in the world), environmental conservation (satisfying the most severe levels of regulations), R & D (a top level in product development) and technical training (a source of technical competitiveness) are also discussed.@Then the characteristics are compared with those of other paper producing countries. It is positive that every country makes the best of its resources to be competitive in the world.
  In Part five, the history of technical development of one newsprint machine which was installed in 1960 as one of largest paper machines in the world and is still running with the highest efficiency will be reviewed as a case study in Japan.


Reduction of Pollutants from Bleached Kraft Pulp Mills by the Process Conversion to Elemental Chlorine Free Bleaching (Part II)
-Reduction of Chloroform and Chlorinated Phenolic Compounds in Pulp Mill Effluents-

Hiro Iwata
Japan Pulp and Paper Research Institute, Inc.

  Chlorinated organic compounds are generated by the chlorine bleaching of pulp. Many of them are persistent and accumulative and toxic. To reduce chlorinated organic compounds, the pulp and paper manufacturing companies in Japan have advanced the ECF conversion of the bleaching process since 1996.
  At Japan Pulp and Paper Research Institute, Inc. the environmental impact of the pulp mill effluent was investigated according to the progress of the ECF conversion of Oji Paper Co., Ltd. and Nippon paper Industries Co., Ltd.? Reduction of chloroform and chlorinated phenolic compounds were reported here.
  Chloroform production in the bleaching process was decreased by 95% or more, and the main purpose to convert ECF in the bleaching process was sufficiently achieved. The concentration of chloroform in the effluent also decreased drastically, and it came to fall below 0.06mg/L of the water quality standard for drinking water.
  Hazardous highly chlorine substituted chlorinated phenolic compounds generated by the chlorine bleaching were reduced by almost 100% with the ECF conversion.? In addition, the generation of chlorinated phenolic compounds has been clearly kept a level by the regulation of chlorinated phenolic compounds of the bleaching filtrate, which is demanded by the cluster rule in the United States.

Keywords: chlorinated organic compounds, chloroform, chlorinated phenolic compounds, ECF