Vol.68, No.5 Abstracts

Estimation on the Economic Impact and the Environmental Conservation Impact Brought by SAQTM Cooking

Junji Tanaka
Quinone Chemicals and Derivatives Dep. Kawasaki Kasei Chemicals Ltd.

  The use of SAQ is more selective for carbohydrates stabilization and delignification. It is economically more attractive due to the increase of pulp production. In this report, the economic impact and the environmental conservation impact by using SAQ as a cooking additive was studied for a Japanese kraft pulp mill which LBKP production capacity is 1,000 tons/day.
  At first, the cost-benefit as an economic impact by SAQ was estimated. When the merit by SAQ (reduction of active alkali and increase of pulp yield) and the demerit by SAQ (decrease of energy generation caused by the reduction of organic solid in black liquor) were calculated for this model pulp mill, it could obtain cost-benefit definitely by SAQ usage.
  At second, the raw material wood chip saving was estimated as an environmental conservation impact by SAQ usage. As a result, it is estimated to be about 11,700  tons/Y in this model pulp mill. Furthermore, the reduction of carbon dioxide emissions in the procurement of wood chip saving was estimated to be about 3,900 tons/Y. Thus, kraft cooking using SAQ has economic and environmental advantages comparing to the original kraft cooking.

The Most Popular Canvas Cleaner in the World Presented by m-clean

Atsushi Nakayama
Paper Machinery Sales Department, Kobayashi Engineering Works, Ltd.

  The patented Kadant m-clean“ MultiJet” cleaning system utilizes high-pressure water in combination with an effective evacuation and air knife system to cost-effectively remove contaminants from the fabric and restore permeability to the fabric. When combined with a rotating brush, the system is capable of on-line coater backing roll cleaning in addition to fabric cleaning. Since year 1995, almost 500 systems have been operated worldwide.

Impact of Sodium Silicate on Paper Machine Drainage and Deposits

Koichi Tanaka, R. Daniel Haynes, Derek Maddox, Joseph Shu and Ong Hui Lam
Pulp and Performance Chemicals Division,Akzo Nobel K.K.

  Over the years antidotal and specific mill observations have been made of sodium silicate carry over from the recycle process impacting drainage and contributing to deposition issues. Sodium silicate has been shown to have benefits beyond being a bleaching aid in the flotation deinking process but the observations of issues at the paper machine has raised concerns. Lots of work and interest has been spend in developing a sodium silicate replacement for pulping chemistry and field testing to date looks good and promising. Benefits obtained from the sodium silicate replacement in pulping chemistry are as follows:
  · Similar DIP quality
  · Lower anionic trash carry-over from the pulp mill
  · Lower process conductivity in both pulp mill and paper machine
  · Improved yield by lower reject consistency
  · Improved pulp mill performance and paper machine runnability
  · Lower overall chemical cost
  Recent work looking at replacing sodium silicate in the recycle plant has given opportunities to observe the difference in drainage time, turbidity and deposition behavior. This paper will first discuss the difference in drainage in a polymer only and polymer/nano-particle silica retention and drainage program when sodium silicate is not used in the deinking process. Then show how sodium silicate interacts with paper coatings to form deposits potentially harmful to paper machine performance using tackiness measurement in conjunction with colloidal stickies concentration.

Picth Troubleshooting of Paper Making by Comprehensive Chemical Approach

Hidekazu Tada and Yasutoshi Himei
Development Dept.1,Nissin Kagaku Kenkyusho Co., Ltd.

  This report describes an important factor of pitch troubleshooting and introduces the newest pitch control technology.
  In recent years, pitch troubles on the paper making process have been increasing by increase in the blending ratio of waste paper and closed water system. This problem is one of the most difficult subjects for the paper making engineers who explore the stable operation and the improved quality.
  The pitch from waste paper has been able to remove to some extent in the pulping process, but the remaind pitch is carried into the paper making process. It may cause some troubles with a wire, a press, and a drier.
  If removal of the pitch was insufficient in the pulping process, the pitch troubles will be caused frequently. The pitch troubles will cause the increase in chemicals and the reduction of productivity. Therefore, we consider that it is the best method to solve the pitch troubles by removing more pitches in the pulping process.

Biomass Boiler Management and Cost Saving by New Analyzer Metso MR Moisture
-Inovetive Moisture Analyzer for Pulp, Biomass Material-

Jarkko Ruonala and Lasse Kauppinen
Metso Automation Inc.
Takeshi Sato
Metso Automation K.K.

  The moisture content of many of the materials used in the pulp and biofuel power industry today is increasingly important to optimizing the operation of the facilities. The technology to measure this moisture content quickly is now available with Metso’s new magnetic resonance moisture analyzer “Metso MR Moisture”. Industry standards of moisture measurement is oven drying method. The issue with the oven drying method is that it takes a lot of time to run the test properly. Metso MR Moisture can be done in the less than two minutes. This quick measurement will vastly improve facilities ability to purchase their raw material based on the true value of material more accurately and incredibly faster than before. Metso Automation performed local test of this new analyzer in domestic pulp mill. The test results for biomass chips improved excellent measurement accuracy, faster measurement time and easy operation of Metso MR Moisture. It shows great possibility for biomass boiler management and cost saving by new analyzer.

How to Make It Possible for WIS to Tell Metal Defects from Others

Jun Ikeuchi
Inspection Systems Business Div., Omron Corporation

  Battery separator, which is one of the insulating sheets, is an indispensable material for its safety and functionality of an rechargeable battery that has been used for a hybrid car, an airplane, etc. In order to tell metal defects that might cause an electrode short circuit from other defects on the surface of battery separator, OMRON has developed an innovative technology of Web Inspection System. With the cameras for exclusive use and the near-infrared reflected lighting, we have got the experimental data that shows a metal defect such as Aluminum, Copper and Iron oxide, with a size of 100-micron order is told from other defects at the speed of 200 m/min.

Energy Saving in Paper Machine Vacuum System
-How to Utilize Modern Process and Variable Speed Drive Technology-

Shigeru Kikawada
Marubeni Plant Engineering Corporation
Jyrki Uimonen and Jussi Lahitnen
Runtech Systems Oy, Finland

  Energy prices are soaring beyond all expectations. On the other hand, new technologies are emerging to tackle this challenge. But how much energy can be saved without putting paper production at risk? In the paper industry, we are use to - for a good reason - to be rather conservative in applying new inventions. Savings and cost factors tend to be marginal in relation to the overall cost and income. Any disturbance in production, however, will cost a lot in lost profits.
  The rising price of energy is putting pressure on paper production costs. Besides the pulp production, the paper machine line consumes a significant amount of energy. When the production volumes are high, the process equipment is a heavy user of energy. From this process equipment, the big pumps and paper machine line drives are the heavy users of energy. New technologies in process design, pumping principles and variable speed electric drives can cut the pumping energy bill dramatically.
  Vacuum pump choice and mode of operation also has a significant impact on energy consumption. High power consumption is needed to produce the paper machine vacuums, needed in drainage and web handling, i.e. for the suction boxes and the suction rolls. Further on, these vacuum elements often represent a big portion of the friction increasing machine drive loads. Dimensioning the system can be a tricky task, because so many variables are involved, and many of them (such as raw material, water, water temperatures) are often beyond the control - at least beyond economical control - of the machine personnel. By utilizing energy efficient pumping principles and controllable technology, this obstacle can be overcome.

Renovation of Underground Existing Various Pipeline
-The PALTEM HL Method/The PALTEM-SZ Method/The PALTEM Flow-Ring Method-

Tetsuo Yoshimitsu
Ashimori Engineering Co. Ltd.

  A large number of pipes are used in various fields and places to improve the industrial efficiency. There are many kinds of pipes such as for gas, industrial water supply, drainage, and oil. Also these are now deteriorating by aging. The PALTEM HL method , The PALTEM-SZ method and The PALTEM Flow-Ring method is the crafting technique for the prolongation of lives of such aging existing pipes, prevention of leakages of pipes, reinforcement of pipes, and renovations of pipes to add quake resistance to it.
  This report is about the background of the PALTEM HL method, The PALTEM-SZ method and The PALTEM Flow-Ring method as a crafting technique of renovation for the underground existing various pipelines.

Water Treatment Systems for Cooling Water Using New Polymer Technology

Kota Sekido
Yokkaichi laboratory, Hakuto Co.,Ltd.

  In the recent cooling water treatment, it has been required the both of performance improvement and environmental measure of the chemicals. We developed new cooling water treatment chemicals (Neofilm HC series and EX series) to meet these requirements.
  "Dual Polymer System (DPS)", consisting of combination with the film forming polymer and the dispersant polymer, has been applied in these new chemicals as core technique. By using the DPS, it is able to reduce the content of zinc and phosphorus and, in addition, to improve the performance of the chemicals.
  The chemicals which are using the DPS indicated high performance compared with traditional chemicals and commercialized chemicals in the evaluation test used cooling water simulator.

The Crisis of Continuing to Exist Professional Engineer, Japan (PE.Jp), Optional Subject- Forest  Products
-Recommendation of Taking PE.Jp  Examination -

Tatsuzo Nebashi
The Institution of Professional Engineers, Japan(PE.Jp)

  Professional Engineer, Japan (PE.Jp) is the national qualification stipulated  by the Professional Engineer Law.  A Professional Engineer is defined as an engineer engaged in the professional practice of rendering services for science and technology in planning, research, design, analysis, testing, evaluation, and training in such work, which requires application of extensive scientific and technical expertise.
  The Enforcement Regulation of the Professional Engineer Law specifies 21 technical disciplines, in each of which a Professional Engineers is qualified.
  Forest which is one of 21 technical disciplines  has  4 Optional Subject , that is Forestry ,Forest Civil Engineering, Forest Products, Forest Environment. Especially among of all, Forest Products is tightly related to Pulp and Paper Industry.
  But the candidate for examination about Optional Subject- Forest Products is decreasing, so, now it is coming to the crisis of continuing to exist. I hope the membership of Japanese Technical Assoc. of the Pulp and Paper Industry try to exam Optional Subject- Forest Products in order to improve your technical skill and develop Pulp and Paper Industry.

Corporate Profile & Products Information (11)


  Shikishima Canvas was established as Omi Hanpu Co., Ltd at the place of Shiga prefecture in 1897.
  Mass paper production in Japan has started in 1872 after introduction of imported western paper machine.
  In those days, dryer fabric have been imported, but the demands of domestic dryer fabric has increased under the influence of paper industriy's development.
  Omi Hanpu has imported 144 inch wide loom from England and started producing of dryer fabric in 1908 for the first time in Japan.
  After several mergers and rename, Shikishima Canvas is now one of group companies of Shikibo Co., Ltd / Industrial Division.
  Shikishima Canvas Co., Ltd makes sales activity and technical development of not only dryer fabric but also filter cloth, corrugating belt and conveyer belt.

-Peer Reviewed-
Enzymatic Hydrolysis of Bamboo and Larch Alkaline Sulfite Pulps for Glucose Production

Yi Zhang and Hiroshi Ohi
Graduate School of Life and Environmental Sciences, University of Tsukuba
Shiho Takahashi
Department of Biomass Chemistry, Forestry and Forest Products Research Institute
Guangfan Jin
School of Light Industry, Zhejiang University of Science and Technology
Keiichi Nakamata
Technical and Development Division, Hokuetsu Kishu Paper Co., Ltd.

  Application of alkaline sulfite-anthraquinone (AS-AQ) cooking was investigated as a pretreatment for enzymatic saccharification and bioethanol production from Japanese larch (Larix leptolepis) and bamboo (Phyllostachys pubescens) culm. It was found that a 60/40 ratio of NaOH/Na2SO3 in the cooking liquor could produce high-yield pulp with the lowest lignin content. According to a method of filter paper cellulase activity, it was shown that the lignin of pulp inhibited enzymatic saccharification when both AS-AQ and soda-AQ pulps were treated by cellulase. Comparing the pulps at a given lignin content revealed that the enzymatic saccharification ratio of larch AS-AQ pulp was higher than that of soda-AQ pulp. Furthermore, it was found that the saccharification ratio of bamboo culm AS-AQ pulp was higher than that of larch AS-AQ pulp, and that the bamboo pulps with a lignin content of 6.8% were more easily hydrolyzed than filter paper. These results clearly show that the AS-AQ method is more effective than the soda-AQ method as a pretreatment, and that bamboo culm AS-AQ pulp is a promising raw material for bioethanol production.