2007”N6ŒŽ@Ž†ƒp‹Z‹¦Ž

 
Results of the Fy2006 follow-up to JPA's Voluntary Action Plan and Report of Energy Situation in the Pulp and Paper Industry in Japan

Osamu Inada
Japan Paper Association

  The Japan Paper Association (JPA) has been actively working to save energy since 1997 when it established its "Voluntary Action Plan on Environmental Issues". JPA declared its policy of restraining CO2 emissions as one of the actions: By Fy2010, reduce fossil energy consumption per product unit for paper products by 13% from that of Fy1990 level, CO2 emission per product unit for paper products by 10%. By 2010, the in-and-outside country afforestation area owned or managed expand to 600,000 ha.
  Since Fy1990, JPA has been following through on the actual results of the unit of energy in the year, and has been publishing its results compared with that in Fy1990. The following are the results for Fy2005 and reports of energy situation in the pulp and paper industry in Japan.
  The survey also reported on energy consumption, CO2 emissions and the position of the pulp and paper industry in Japan, and information related Laws.


Introduction of Save Energy type Cl&K Removal System
- Consideration of Chloride Ion & Potassium Ion Removal System for Solution of Electrical Precipitator Ash from the Point View of Save Energy -

Tsunenori Okamura
Specialty Plant & Materials Division, Nippon Rensui Co.

  In the process of Kraft Chemical Recovery Cycle, Chloride (Cl) and Potassium (K) entering with raw-material wood chip are gradually accumulated and concentrated during continuous operation. The plugging issue of carryover particles and dust in the Recovery Boiler is caused by decreasing melting temperature of dust along with increasing concentration of Cl and K in the Black Liquor. At the same time, fouling and corrosion at the super heater of Recovery Boiler is apprehended. This manuscript provides actual result from Cl&K Removal System which are developed and installed at Niigata Mill, Hokuetsu Paper Mills, Ltd. together with the theory of removal system using ion exchange resin which are characterized of this system and advantages from the point view of save energy.


Energy Saving with LP-Screen

Atsushi Nishida
Matsumoto Mill, Oji Paperboard Co., Ltd.

  In the stock preparation system to produce the secondary pulp by recycling of the waste paper, each process of the pulper, screen and refiner consumes significant energy.
  So, how to positively promote the energy saving issues will become key point to extensively reduce the production cost in such heavy energy consumption type of pulp and paper industry.
  In this paper, some examples of energy saving are introduced which were achieved by rebuilding the conventional PS Screens into LP Screens, utilizing the low power and low intensity of LP Screen technology which was developed by Voith IHI Paper Technology (VIPT).


Steam Stabilization and Energy Conservation for a Coal Boiler by Using a Model-Driven PID Controller

Michihiro Fujiyama
Yatsushiro Mill, Nippon Paper Industries Co., Ltd.
Hiroshi Egi and Takashi Shigemasa
Toshiba Mitsubishi-Electric Industrial Systems Corporation
Fumio Kojima
Toshiba IT & Control Systems Corporation

  The movements of energy conservation in Japan are promoting based on the Kyoto Protocol concerning the reduction of greenhouse gases at COP3 held in Kyoto in 1997. According to the energy conservation, the industrial world is making various efforts for the conservation of energy. The amount of use of cheap coal for boilers of factories is increasing especially in spite of recent rising of the energy cost.
  Comparing to gas boilers and oil boilers, coal boilers have long dead time from the boiler master command to main steam pressure due to long fuel transportation time and long fuel burning time. Due to the long dead time, the large control gain is not able to set, as a result the main steam pressure and the main steam temperature are fluctuating in the large band
  If the fluctuation bands could be reduced, and if there is some margin at temperature limit, the boiler efficiency can be improved by setting higher value of the set point of the main steam temperature control loop.
  We have already obtained some excellent results by applying the model drive PID control (MD-PID) for long dead time processes.
  In this paper, after showing the Yatsushiro plant, coal boiler issues and properties of the MD-PID control system, we show the result for a coal boiler of 440t/hr level of the main steam flow rate.


Energy Saving in the OCC Pulping Process

Kenya Horikawa
Yashio Mill, Rengo Co., Ltd.

  Recently, increasing the social demands on environmental conservation, Rengo has established Eco Challenge 009, the document setting forth our environmental vision and is implementing resource and energy savings. Regarding the energy saving, we target reduction of 12% of CO2 emission from the 1990 level until 2009.
  As part of our efforts, Yashio Mill has focused on energy saving in pulping system of old corrugated container ("OCC"), the main material at the mill, and we would like to introduce the way and result of energy saving as a case.


The Activity of "Energy Saving Team"

Akira Takahashi
Nippon Paper Unitec Co., Ltd.

  "Energy Saving Team"@belongs to Technology Research Section of Nippon Paper@Unitec Co., Ltd. and works to help creating energy saving plan for all 12 mills of Nippon Paper Industries Co., Ltd.
  The Team started at December 2004 by one person for Power and Environment division and the other person for Pulp and Paper production division.
  We visited all 12 mills and had discussion about our ideas for energy saving every-year. On the discussion, we proposed around 30 ideas for each mill last year and the result of our proposal contributed around 8“ of total energy saving cost.


Fiber Properties - Paper Quality
- Multidimensional Fiber Characterization -

Bertil Olsson
BTG Pulp and Paper Sensors AB
Takuya Maekawa
Spectris Co., Ltd. BTG Division

  This paper deals with the methods of characterizing fiber properties in order to get defined paper properties. The reasons for on-line real time measurement will be discussed as well as the advantage of pulp characterizing methods based on single fiber properties compared with traditional laboratory measurement on a hand sheet. Discussions of some applications involving on-line fiber analyses. A completely new on-line measuring system, based on the state-of-the-art today, will be presented. By combining knowledge from next generation analyzers and use of new tools for control applications a supervisory control system for optimization of fiber quality will be presented. This contributes to an added value from both lower production cost and more stable quality. Some typical applications set up by using this new analyzer in combination with adopted control package will be presented.


Improved Runnability and Drying Capacity through New Technology

Kari Juppi
Metso Paper Inc.
Kouichi Yuuki
Metso Paper Japan Co., Ltd.

  Firstly, new efficient runnability components are introduced and their effect on runnability and paper quality are discussed. Results from pilot and production machine installations are described. Secondly, new drying concept is presented. This concept utilizes impingement air technology in paper or board drying. Impingement drying is presented as a short view to history in this field. High-speed paper machines tend to have runnability problems at the beginning of dryer section. A high draw is often needed which leads to poor paper quality. A draw decrease can be implemented utilizing efficient blow boxes. However, when the sheet dry content before cylinder drying must be increased, a good choice is to dry paper with impingement drying before cold paper web contacts the hot cylinder surface. A new solution has been created for meet this challenge. This new concept utilizes impingement drying right after press section by increasing web dry content remarkably before the first drying cylinder. As paper dry content and also paper temperature has been increased, paper strength is higher and runnability is better than normally.


The New Contactless Level Gauge and Density Meter: Accurate Measurement by Using a Weak Gamma Source

Hiraku Miyashita
Nanogray Inc.

  Gamma-ray (-ray) level gauge TH-1000 and -ray density meter PM-1000 have the latest detecting system which is the fruit of our technologies on industrial measurements with radiation over 10 years. Although TH-1000 has only a 100MBq (2.7mCi) source which is a one-several thousandth strength compared with the conventional -ray level gauge, TH-1000 can apply for 1.5m-span level gauging and 10m-span level switch. The minimum response time is only 0.5sec which provide quick process control. PM-1000 has only }0.4`0.7% error @ 2, although PM-1000 also has only 3.66MBq (0.1mCi) source which is a one-several thousandth strength compared with the conventional -ray density meter. PM-1000 can attach easily on a pipe of the existing line. PM-1000 can apply density measurement of black liquor, green liquor, lime mud, calcium carbonate, and white carbon etc.


Bearing Solution for Paper Plant

Kunio Osaki
HI Sales Dept., Schaeffler Japan Co., Ltd.

  INA group Company integrated FAG and LUK few years ago. After integration, Schaeffler Group started and now has been producing selling bearing and making technical service.
  Schaeffler has many experiences of bearing solution for pulp and paper industries. Schaeffer would like to report about 4-cases of special bearing solutions for mainly paper mill application.


Performance and Function that are Demanded of Next Generation Inspection System

Terumasa Miyamoto
W.I.S. Grope, IT Solution Division, Omron Corporation

  An initial Web Inspection System, if it detects the defect, was the one only of simple information of it with the buzzer and the lamp, and marking to the defect location. Afterwards, defect information on the defect position, the size, and the classification name is added. It became a very usual function there was a defect recording system that Omron developed in 1988 now, too. Moreover, by transmitting inspection data to the next process like FCS (Fault Control System) and WCS (Winder Control System), it got to do the productivity improvement and the product management of the next process, too. Also, at present, it became possible by the improvement and the generalization of the PC and the network technology to handle a large-volume defect image, too. As a result, it is possible to say that the volume of information of the inspection data became big drastically and that the existence value, too, became bigger. In this way, Web Inspection System was placed in the nucleus of the solution to place as of the paper maker. It introduces about Performance and Function that are demanded of "Next Generation Inspection System".


Characterization of Coating Color Penetration by Laser Scanning Microscopy

Kenji Hirai
Research and Development Dept., Product Development Research Lab.
Nippon Paper Industries Co., Ltd.
Douglas W. Bousfield
University of Maine

  The quality of a coating layer and the efficiency of a coating process, depend in large part on the penetration of coating color into the base paper. However, methods to characterize this penetration are limited. This paper proposes a new technique that combines Confocal Laser Scanning Microscopy (CLSM) and the image analysis to characterize the coating penetration into the substrate without any sample destruction and with little sample preparation.
  In this paper, two methods to stain samples were tested to achieve the quantitative analysis of the coating layer thickness variation and the liquid phase penetration into the base paper. The results were compared to those obtained from cross sections using Scanning Electron Microscopy (SEM). Coatings applied onto a plastic film calibrated the measured thickness with this technique and demonstrated the limitations of the CLSM method in terms of depth resolution.
  As a result of the experiments, the method to stain the coated sample with fluorescence dye gave the coating layer thickness variation that were consistent with those from SEM, while the liquid phase penetration depth, which was larger than the coating layer thickness, could be measured when the dye had been added to the coating color before the application. These results demonstrate a possible method to characterize the coating layer thickness and the penetration depth of the liquid phase into the base paper.

Keywords: coating penetration, confocal scanning laser microscopy