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2009 September JAPAN TAPPI JOURNAL


Vol.63 No.9 Abstracts


Optimization of Quinone Compounds Impregnation in Kraft-quinone Cooking

Junji Tanaka
Kawasaki Kasei Chemicals Ltd.

  SAQ has been used as a cooking additive in many KP mills. This process is known as gQuinone Cookingh. The author developed laboratory wood-cooking equipments which can reproduce the modified continuous cooking (MCC) processes of a mill-digester and clarified the optimized MCC conditions using SAQ. As a result, SAQ was most effective when it is added at the beginning of cooking. It indicates that SAQ is very important to impregnate efficiently into wood chips. In this report, the effect of introducing the SAQ impregnation treatment before the cooking process was investigated using the laboratory cooking equipments.
  By measuring SAQ in liquor after the impregnation treatment, the impregnate conditions (temperature, time, active alkali dosage, and liquor/wood ratio) were optimized. When kraft cooking after the impregnation treatment was performed, SAQ effect improved more than kraft cooking without the impregnation treatment.


Application of Microbial Products and Fluorescence Imaging for Activated Sludge Control

Ryoji Igarashi, Takuji Yamamoto and Hideomi Matsuoka
Research and Development Division, SEIKO PMC Corporation

  Recently, an increasing social awareness of environmental issue has prompted administrative guidelines and regulations of industrial effluent. In this situation, simultaneous pursuit of environmental preservation and improvement of productivity is important for the pulp and paper industry. For stable operation of a plant, it is essential to enhance capability of wastewater treatment. In this report, we propose two effective and convenient approaches for improving wastewater treatment. The first is the application of microbial products in activated sludge, so-called gBioaugmentationh, and its tracking technique. Microscopic FISH (Fluorescence in situ hybridization) analysis of bacterial cells allows for gremodelingh of activated sludge by the microbial products. The second is the analysis method for monitoring physiological activity of bacterial community in activated sludge. Visualization of the physiological activity of bacterial community, which is invisible by conventional light-microscopic observation, should provide a useful indicator for controlling activated sludge treatment. In addition, we show an example of improvement of activated sludge treatment in pulp and paper plant, in which microbial products and fluorescence imaging techniques were used.
  Since invention of activated sludge system, it has been unclear how bacterial composition and its physiological state shifts in this gblackboxh. In our approach reported here, a remarkable feature is that we can monitor a part of the inside of gblackboxh, and can improve the system efficiently.


OxiPROTM Technology
-Maximizing Machine Efficiency through Proactive Deposit Control-

Akihiro Maeshima
Katayama Nalco Inc.

  Katayama Nalco Inc. has introduced several innovative technologies to provide solutions to the Paper industry; designed to achieve improvements in operating efficiency, while achieving better product quality & promoting environmental sustainability. Nalco has introduced OxiPROTM technology, the paper industryfs first online monitoring system for microbiological control. This technology enables the papermakers to optimize usage of biocides, to make their process more eco friendly and at the same time, improve operating efficiency.


A Study on Improvement in Quality of Dry-strength Agents for Neutral Papermaking

Kazuki Tanaka
Research & Development Department, Paper Chemicals Division, Harima Chemicals, Inc.

  Recent paper industry makes every effort to improve the productivity and to reduce the environmental loading by using new paper machines and waste paper as raw materials used for the papermaking system. In such a situation, paper manufacturing companies are promoting to increase inorganic filler such as calcium carbonate.
  However such a situation causes the rising of electric conductivity, which makes it difficult to get the effective performance for paper strength agents. Because it causes the inactivation and hydrolysis, it becomes the reduced of the adsorption of dry-strength agents on pulp fibers.
  Recently, paper manufacturing companies are promoting investment in plant and equipment of high speed new paper machines for enhancing cost competitiveness in the international market. The high speed of paper machine causes the decline in performance of dry-strength agents for drop of the retention.
  In this paper, we report that the study on improvement in quality dry-strength agents for neutral papermaking on high-speed paper machines.


Business Risk Management with gVisualizationh of Environmental Pollution
-Environmental Monitoring System ge-FEINSh-

Kenzaburo Makita
FUJITSU FIP Corporation

  FUJITSU FIP Corporation was developed e-FEINS (Environmental Monitoring System) of environmental risk management. Environmental Monitoring System analyzes monitoring data in every hour that are transmitted from environmental monitoring station in business place.
  Advantage of Environmental Monitoring System is gimprovement of Environmental conscioush, gswift measure devised to deal with a problemh, greduce reporting hoursh and gsmooth Communications of in-house, local government, and neighborhoodh.


Bearing Coating Technology

Kunio Osaki
HI Sales Dept., Industry Division, Schaeffler Japan

  There are many kinds of machines which is contributing to higher efficiency of productivity. So many kinds of machine parts/tools are used and some of them have special coating on their surfaces. Now, gcoating technologyh is the one of most important technology for mechanism parts. Bearing is also one of important mechanism parts, and so many kinds of bearing are used in many rotating/sliding mechanisms.
  Some of bearings and related parts have also special coating on surfaces. This means coating is also important technology for bearings. Amorphous carbon coating for anti-wear bearing is introduced in this report.


Significance and Economical Effect of the Glass Lined Steel Tank

Kuniyasu Sasaki
Industrial Machinery Dept., Ecological & Industrial Machinery Div., Itochu Sanki Corporation

  Among all plant equipments, stainless tank is the one of the most requisite ancillary facilities. The purpose of the stainless tank is to store, digest, and to react content. Stainless tank has beset paper mills because of its long delivery time and moreover, due to recent dramatical steel price run up, it's become to oppress mill's budget of investment for plant and equipment. Prominent corrosion resistance of stainless steel is essential for pulp and paper industry and in particular, it is often seen that paper mills are forced to use stainless tank as clean water tank, slurry tank or effluent tank etc. Itochu Sanki is pleased to introduce this Glass lined steel tank "Science Farm" to pulp and paper industry in Japan to give mills a chance to seek a solution.


Hyper Shaped Engineered Kaolin in Barrier Application

David I. Gittins
Research Development and Technology Group, IMERYS
Tatsuya Asano
Imerys Minerals Japan K.K.

  Materials such as PE, PVDC and fluorocarbons have been used as functional materials to provide barrier properties in coatings for the packaging industry. Recently, the eco-friendly trends, functional materials that are easier to recycle and more environmentally friendly are in increasing demand. As a result there is increasing interest in using water based coatings to move away from the less environmentally friendly functional materials. In this paper, IMERYS has investigated using high aspect ratio kaolin particles in water based barrier coatings as a potential method for a barrier coating that provides improved barrier functionality vs. more traditionally available kaolin materials.


Development of Long-life Slitter Knives Using Novel Hard Carbon Films

Teruyuki Kitagawa and Tokumi Ikeda
Nomura Plating Co., Ltd.

  Novel hard carbon thin film (product name: Tough Carbon) was synthesized using gas cluster ion beam (GCIB). The cluster ion is the ion which consists of several hundred to thousand atoms. The irradiation effects of cluster ions are very unique and quite different from those of single ion or those of plasma process. Therefore, the properties of the films which have not been obtained up to the present have been achieved. The characteristics of Tough Carbon are higher hardness (Hv5000), higher adhesion, and lower process temperature, compared with those of the prior films (Diamond-like Carbon: DLC). When these films deposited on slitter knife for cutting papers, the twice or three times longer life time was obtained than that of no-deposited knife. In addition, the method and the equipment for the formation of Tough Carbon, and the details of the film characteristics are mentioned in this paper.


The Latest Modern QCS Paper IQ Selec
t -A Step Change in QCS Performance and Application-

Noriyuki Watanabe
Pulp & Paper System Division, Metso Automation K.K.

  Metso Automation announced new QCS, Paper IQ Select with gPatented New adaptive and situation-based scanningh, gOnline variability analysis tools based on high speed measurementsh, gDetailed edge measurement and scanningh, gFull family of robust multivariable controlsh and gTwo new intelligent scannersh. Paper IQ Select with new features provide faster grade changes, better recovery from web breaks and lower paper waste. Online variability analysis helps paper makers to improve process stability and machine efficiency.


Line Synchronization from Paper Machine to Coater

Satoshi Suzuki
Surface Inspection Systems Division, COGNEX K.K.

  gLine Synchronizationh is a new function of Cognex SmartView inspection system. It allows user to easily track defects from one process to another, for example, from paper machine to coater, and enables actions to be taken in real time on the current process based on defects detected in prior processes. By Cognex unique distance code decoding technique, tracking defects is accurate. When using Line Synchronization with Advanced Winder Advisor, it will give a total solution for effective inspections and wider operations in their product flow.


Effect of Energy Saving on Paper Mill White Water Using Spin-Klin Automatic Backwash Filter System

Kazuyasu Izawa, Shouji Mizumura and Daigo Hama
Nihon Pall Ltd.

  The pulp and paper industry consumes enormous amount of energy every year; therefore, it has made an effort to reduce energy consumption 25% in ten years from 1981 to 1991. The industry has another target to reduce energy consumption in 2010 by13% and CO2 emission by 10% to 1990 by the introduction of additional high-efficient equipments and reconsideration of a manufacturing process.
  In this paper, it has been demonstrated that energy saving was achieved by adding Spin-Klin automatic backwash filter system to filter and recycle whiter water which was disposed to drain before. It was confirmed that the reduction of steam consumption equivalent to approximately 4,000 tons of CO2 emission reduction was achieved. It was confirmed that recycling of clear white water using the Spin-Klin automatic backwash filter system was very effective in energy saving and CO2 emission reduction.


Reduction of Pollutants from Bleached Kraft Pulp Mills by the Process Conversion to Elemental Chlorine Free Bleaching (Part 1)
-Organic Halogens in Bleach Filtrates and in Whole Mill Effluents-

Hitoshi Takagi and Miyuki Nakagawa
Japan Pulp and Paper Research Institute, Inc.

  The formation and discharge of organic chlorine compounds in 17 bleached kraft pulp mills, changed bleaching process to ECF, have been evaluated. AOX and EOX in the bleach filtrates decreased by 83% and 70% respectively by the bleaching process conversion to ECF. OX in the bleached pulps decreased from 0.54kg/t to 0.16kg/t. A small amount of AOX and EOX was formed with chlorine dioxide-based ECF bleaching. The average ratio of EOX to AOX in the bleach filtrates became slightly higher from 2.5% to 3.5%. The average percentage of OX in the pulps to the sum of AOX and OX, the total halogens generated in the bleaching process, became higher from 21% to 32% by the bleaching process conversion. These results suggest that organic chlorine compounds formed with ECF bleaching are not so hydrophilic compared to chlorine bleaching. The discharge of AOX and EOX from ECF bleached pulp mills decreased by 80% and 68%. The average AOX discharge from the ECF bleached pulp mills was 0.16 kg/t. This low level was achieved with combinations of ECF bleaching, modified cooking, oxygen delignification and efficient wastewater treatment. The average ratio of EOX to AOX in the mill effluents became slightly higher from 2.1% to 2.8%.The persistent AOX and EOX in the effluents from bleached pulp mills decreased remarkably by the process conversion to ECF bleaching. However the biodegradability of organic chlorine compounds in the effluents was not so improved.

Keywords: ECF bleaching, bleach filtrate, effluent, AOX, EOX, chlorine dioxide