2008年5月 紙パ技協誌

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JAPAN TAPPI JOURNAL May 2008


Vol.62 No.5 Abstracts


Biorefinery in the Pulp and Paper Industry

Keiichi Nakamata
Technical & Development Div., Hokuetsu Paper Mills, Ltd.

Abstract
 Technological development of biorefinery is being proceeded all over the world. Biorefinery is the technology which creates bioethanol and plastic from biomass as the raw materials, and it aims for an action to oil resources drying up and global warming prevention. Raw materials of biorefinery are mainly sugar, corn, cellulose-based material and so on. The use of cellulose-based material as a biomass is dominant in order to avoid competition with provisions.
 Technology of the pulp and paper industry is applicable to cellulose-based biorefinery.


Energy Saving by “Intensa Pulper” of Stock Preparation System

Takeshi Murakami
Research & Development Dept., Voith IHI Paper Technology Co., Ltd.

Abstract
 In recent years, various technical innovation was achieved in the field of secondary fiber system. As result, power consumption of the secondary fiber system has been reduced to 100 to 130kWh/T from 200kWh/T of more than ten years before. Such improvement has been mostly derived from progress of the screen technology, particularly the LP Screen that was developed by Voith IHI Paper Technology (VIPT) is significantly contributing to the progress.
 Regarding the low consistency pulper which will be most important machine as well as the screen in the secondary fiber system, there have been few technical innovation for about 30 years. However, the Intensa Pulper which has been developed and released by VIPT is really innovative machine and might change the design concept of the secondary fiber system from now on. Energy consumption of the OCC treatment system is now going to be reduced to 50kWh/T by application of the Intensa Pulper.


Steam Saving by Waste Heat Recovery from Machine White Water

Tomoyuki Sakashita
Mitsubishi Paper Engineering Co., Ltd.

Abstract
 We have taken measures to reduce the energy consumption as one of the environmental improvement plan based on ISO 14001 standard in the Hachinohe mill of the Mitsubishi Paper Mills, Ltd. Company since 2001. And the target of the plan is to reduce the ratio of steam and electricity consumption to the paper production in the mill at the rate of 1 % every year.
 Therefore we investigated the actual conditions of processes in the mill and made a plan to save water from the point of view of decreasing the amount of heat loss in waste water from the mill in order to reduce steam consumption. Based on the plan, some measures have been carried out since 2002.
 In this paper we describe the way to make the best use of hot water from machine white water and how to make compact of a filter plant which is for recycling white water from paper making process.


Introduction of Latest Energy-saving System for Waste Paper Treatment
-Possibility of Energy-saving for Pulper, Screen and Refiner-

Kazuo Aoshima
Aikawa Iron Works Co., Ltd.

Abstract
 Recently saving energy is most important target in the pulp and paper industry in Japan because of CO2 exhaust amount reduction. There are many machines to use big power at stock preparation. Therefore we would introduce a result of energy saving by our new technology for Pulper, Screen and Refiner.


Energy Saving by Installing the New Model of Refining Plate

Tsutomu Otani
Ishinomaki Mill, Nippon Paper Industries Co., Ltd.

Abstract
 In the pulp refining process, generally double disk refiners (DDR) are installed.
Pulp refining needs much energy, so that to develop energy saving technology of pulp refining is one of the most important objectives. However, energy saving technologies of pulp refining sometimes causes pulp strength declining, so that the balance between energy saving and pulp strength is very important.
 Recently, the new model of refining plates "FineBar (Aikawa Iron Works Co., Ltd.)", which is made by stainless steel and has 1mm-width blade, was installed into our DDR for bleached hardwood kraft pulp. This installation results power consunpution is decresed even though pulp strength is maintained.
 In this report, we introduce a case of saving energy by installing the new model of refining plate.


Energy Saving and CO2 Reduction Case in Power Plant
-Boiler Fuel Conversion by Installation of LNG Satellite Facilities and Installation of High Efficiency Steam Turbine-

Tadashi Arifuku
Tonegawa Mill, Rengo Co., Ltd.

Abstract
 In line with increasing social demands on environmental conservation, Rengo has established Eco Challenge 009, a document setting forth our environmental vision, and is implementing resource and energy savings activities. As part of our efforts, Rengo targets to achieve 12% reduction of CO2 emissions from the 1990 level by 2009.
 This paper will introduce LNG satellite facility and high efficiency steam turbine installed at Rengo Tonegawa Division. The effect of fuel conversion and high efficiency turbine installation, such as reduction of CO2 emissions, will also be examined.


Steam Saving by Pre-evaporator System

Tomoya Kujime
Takaoka Mill (Noumachi), Chuetsu Pulp & Paper Co., Ltd.

Abstract
 The necessity for energy-saving is increasing increasingly with the jump of the fuel cost not stopping. With the exception, there is also no pulp and paper industry and it is tackling each company energy-saving. As one of many of the energy-saving measures, pre-evaporator was installed at the Takaoka mill in May, 2007, and it is working formally from June.
 A main subject reports the energy merit by steam saving by it. This system installs 3 stages plate-type evaporator, a vacuum pump, and a condenser after flush cyclones.
Black liquor extracted from digester repeats a self-flush by three steps of flush cyclones, and is led to pre-evaporator. Then, it is condensed about 2 percent by the solid base, and is sent to main evaporator. The vapor condensate from the flush cyclone is separated into the high B.O.D. liquor and the low one:therefore this system makes processing of the foul odor water the minimum.


Energy Saving by Changing Operation Range of Sootblowing Extracted from Steam Turbine

Takehiro Tanaka
Niigata Mill, Hokuetsu Paper Mills, Ltd.

Abstract
 The prevention global warming and the saving energy are increasing their importance. In recent years, the attempt for saving energy such like reducing the consumption and improving the cost due to rising prices of fossil fuel have became an important issue. Hokuetsu Paper has actively worked on improving resource and saving energy based on the fundamental philosophy and principle in “Hokuetsu Paper Environmental Charter”.
  In April 2005, for the purpose of reducing the environmental load and highly effective operation, No.8 power generator was built. The power generator consists of soda recovery boiler which has the biggest black liqueur solid resolve capacity in Japan and an 85Mw steam turbine. In February 2007, No.3 biomass boiler which burn the paper sludge, the RPF and the waste wood chip was built, which works more on reducing fossil fuel and minimizing environmental load. In changing the plant operation, effective management and saving energy in power supply section is the biggest issue in all over companies.
 In this study, increasing extracted steam power generation by expanding the operation range of first extracted steam in No. 8 steam turbine and energy saving examination which reducing sootblower steam flow are introduced.


Development of High Performance De-inking Agent
-LIPOBRIGHT Series-

Tomoyuki Nogawa and Takashi Tanaka
Paper & Pulp Group, Specialty Chemical R&D Department,
Research & Development Division, NICCA CHEMICAL CO., LTD.

Abstract
 It is important to use regenerated pulp not only to protect forest resources but also to prevent global warming by control of carbon dioxide exhaustion. In paper manufacturing industry, technologies of recycle paper have progressed and high quality regenerated pulp is produced a lot with user’s specific needs. Such recycling resources have become important more and more. On the other hand, profits of the used paper decrease because of sudden rise of oil price and increase of export amount to China. Therefore, development of high performance and high efficiency de-inking agents is strongly demanded. We have developed LIPOBRIGHT DP-100 series recently. Those have so high de-inking property that realizes reduction of the usage compare to conventional de-inking agents. Those impart stable de-inking operations because of less sensibility of temperature changes at flotation stage. We report herein newly developed LIPOBRIGHT DP-100 series.


Material Retention: A Novel Approach to Performance of Pigment Coating Colors

Ken McKenzie, Anne Rutanen, Jukka Lehtovuori, Jaana Ahtikari and Teuvo Piilola CP Kelco Oy

Abstract
 Continually increasing machine coating speeds together with new coating color components have put more emphasis on the importance of the correct rheology and water retention of the coating colors to achieve good runnability and end product quality.
In the coating process, some penetration of the aqueous phase, to the base paper or board must occur to anchor the pre-coating to the base or the topcoat to the pre-coat. The aqueous phase acts as a vehicle not only for the binder, but also for the other components. If this water or material penetration is not controlled, there will be excessive material shift from the coating color to the base, before immobilization of the coating color will stop this migration. This can result in poor machine runnability, unstable system and uneven coating layer, impacting print quality.
 Rheology modifiers or thickeners have tended to be evaluated on the performance of the coating color by the term, “water retention”. This simple term is not sufficient to explain performance changes during coating. In this paper we are introducing a new concept of “material retention” considering the control of all of the movable material including water in the coating color. Controlled material retention leads to uniform z-directional distribution of coating color components. The changes that can be made to z-directional uniformity will have positive effects on print quality as measured by ink setting properties, ink gloss, mottling tendency, surface strength, optical properties, such as light scattering, whiteness and light fastness delivery should be improved.


Endless Challenge for Longer Bearing Life

Kunio Osaki
Schaeffler Japan Co., Ltd.

Abstract
 General speaking, all bearing manufacturer has been trying to improve bearing life time. In these 4-3 years, after integration of INA and FAG, Schaeffler has been trying to improve bearing life time based on surface modification, and successfully improved bearing life time by 50% - 70% as a result of combining INA/FAG production technology. Schaeffler would like to report about contents of longer life(X-Life) version.


Case Study of Energy Saving Using OSIsoft PI System
-Energy Management System Using the RtPM Platform-

Shizuo Itoh
OSIsoft Japan KK

Abstract
 In recent years the efficient management of the energy usage is becoming increasing critical to company profitability. Industry leaders are looking for methods to gather and analyze energy usage data in real-time rather than just tracking energy costs versus production on periodic basic.
 Using the RtPM (Real-time Performance Management) platform from OSIsoft, several industry leaders are building cost effective energy management systems for automatically gathering, analyzing and reporting data on energy consumption and costs in real-time.
 The PI system has become one of the most successful and widely used RtPM platforms in the pulp and paper industry. This paper introduces about outlines of PI and case studies of energy saving application using PI.


A Report on the 8th Research Forum on Recycling

Shisei Goto
Nippon Paper Industries Co., Ltd.
Junsuke Kawana
Oji Paper Co., Ltd.

Abstract
 The conference, “the 8th Research Forum on Recycling” was held in Niagara-Falls, September 23-27, 2007. The forum was jointly organized by PAPTAC and TAPPI and continued its history of cutting-edge research results on recycle fiber. There were approximately 150 attendees from around the world including 4 delegates from Japan. The programs had 13 sessions featuring 34 oral presentations including 2 panel discussions, one workshop regarding stickies, and two mill tours. The trends of presentations were summarized and notable researches were cited in this report.


A Study on Quantitative Determination of Fluorescent Brightening Agent Contained in Paper

Maiko Kaji, Toshiharu Enomae and Akira Isogai
Graduate School of Agricultural and Life Sciences, The University of Tokyo

Abstract
 It is prohibited under the Food Sanitation Law to add fluorescent brightening agent (FBA) to paperboard for food packaging. However, a certain amount of FBA inevitably comes to be mixed in paperboard produced mainly from recycled pulp. For adequate decomposition or removal, quantitative determination of FBA was investigated. Logarithm of the fluorescence intensity measured by fluorescence spectrophotometer was almost proportional to the logarithm of the concentration in the range between 10 ppb and 10 ppm. Filter paper was dyed at pH 3 with FBA extracted at pH 9 from a recycled pulp. Fluorescence images of the dyed filter paper were acquired with a CCD camera. The logarithmic gray level of the images and the logarithmic concentration of the FBA solutions showed a linear relationship. With regard to FBA removal, although alkaline treatment up to pH 13.0 did not remove much of it, hypochlorite at 1 ppm was found to lower fluorescence intensity from 1000 ppb to approximately 1ppb as a corresponding FBA concentration. In the method of extracting FBA with superfluid CO2 followed by quantitative determination by high performance liquid chromatography, FBA was extracted almost completely in the alkaline condition in which water and organic base were added to superfluid CO2 as modifiers.

Keywords:Fluorescence spectrophotometer, food packaging, hypochlorite, stilbene, superfluid CO2