2013 April JAPAN TAPPI JOURNAL
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2013 April JAPAN TAPPI JOURNAL

Vol.67, No.4 Abstracts


Biodiversity Initiatives at Nippon Paper Group

Keiko Watanabe
Nippon Paper Industries Co., Ltd.

  Nippon Paper Group is a corporation closely connected with biodiversity. We utilizes treesC a renewable resource provided from ecosystem servicesC to provide society with products such as building materialsC paper and chemical products and support peoplefs lives and contribute to cultural development. The loss of forests would lead to a loss of our operating base. Continuing the stable supply of products that utilize forest resources by taking into account biodiversity and pursuing sustainable forest management is one of the Groupfs social responsibilities. For this reasonC we have established ghelping preserve the global environment over the long term and contributing to the development of a recycling-based society by carrying out corporate activities in recognition of the importance of biodiversityhas the philosophy of our Charter on the Environment and undertaken a variety of initiatives in this area.
  This report focuses on the activities undertaken by Nippon Paper GroupC whose operating base is forest resourcesC to ensure the continuity of its business. The report will introduce activities the Group has undertaken to preserve biodiversity from the dual perspectives of ginitiatives through core business activitiesh and ginitiatives utilizing in-house resources and technologies.h


Application of CelluloseFManufacturing Stronger and Lighter Bioplastic Combined Cellulose with Plastics

Soichi Takahashi, Hiroyuki Tanaka, Hiromi Hashiba and Kisaku Shimizu
Chuetsu Pulp & Paper Co., Ltd.
Wataru Mizuno
Toyama Industrial Technology Center

  In recent years, because of increasing of interest in development of the low-carbon society, many researchers are studying to replace from petroleum-derived materials to eco-efficient plant derived ggreenh composites materials . Natural wood is the most sustainable and renewable resource and stockpile of natural wood on the earth will reach a trillion tons. Pulp mill has been living with the production and sale of pulp and paper as core business by using these natural woods.
  Pulp is mainly consisted from cellulose fibers that have several ten micrometers diameter, the unit element in the fibers composition is cellulose (nano)fibrils that possess diameter ranging 1 to 100 nanometers with a high aspect ratios. These fibrils can be easliy dispersed in water by chemical modification (surface oxidation, acidic hydrolysis) or high pressure shearing, and the dispersed nanofibrils are called cellulose nanofibers (CNF).
  We have produced various cellulose nanofibers from our own pulps and studied the composites containing CNF and polypropyrene (PP). As a result, it was confirmed that improvement of the mechanical properties by blending a few percent of CNF to PP resin. In addition, Interestingly, depending on the degree of fibrillation level of CNF, the composites were shown different mechanical properties for each. Improvement effect of CNF-composites shows a tendency to decrease in composite materials with CNF which has been too progressed fibrillation. Therefore, it was suggested that the optimum fibrillation-level of CNF for improvement of mechanical properties of composites might exist.


Operating Experience of Hyper-Cell Floatator

Hisashi Iwabuchi
Hokkaido Mill-Yufutsu, Nippon Paper Industries Co., Ltd.

  In Japan, the utilization rate of recovered paper reached 63% in 2009. Except paper board, ONP is mainly used for recovered paper. Since news paper quality, such as ash content, has been changed, ash and microsticky removal is required, especially at the flotation process for paper recycle. In order to improve DIP quality and promote further use of DIP, AIKAWA Iron Works Co., LTD. and Nippon Paper Industries developed the state-of-the-art floatator gHyper-Cell Floatatorh and installed in Hokkaido Mill-Yufutsu in 2008. This report introduces our operating experience of Hyper-Cell Floatator.


Efficient Use of the Residue of Bio-Fuel Production
-Paper Production from Sweet Sorghum-

Atsushi Ohno and Shinichi Hara
Toho Tokushu Pulp Co., Ltd.
Youji Nitta , Fumitaka Shiotsu , Naomi Asagi and Takashi Homma
The College of Agriculture CIbaraki University

  When we get lack of energy, as the energy demand grows, there comes the time to research biomass energy. But the enthusiastic researches fade away, sooner the oil price gets down to be stable. It has been 20 years since they started research sweet sorghum as a bio-fuel at Ibaraki University. To make bio-fuel, sugar is extracted from sweet sorghum and fermented to be ethanol. They actually made success to run automobiles with the bio-fuel. It is a great progress. Here we suggest another point of view for sweet sorghum, to make pulp from the residue of bio-fuel. There remains a lot of cellulose after sugar extraction in the sweet sorghum. We found that it is possible to make pulp from the residue of sweet sorghum, and furthermore the strength of pulp is stronger than that of LBKP. We finally produced envelopes available for general use, enhanced the value to the residue of bio-fuel. Since it is true that it costs a lot to make pulp from the residue, reduction of pulping cost is the first problem to solve. Anyway, it is significant to contribute to study the biomass, not only for bio-fuel but for the residue to reduce waste or costs.


Energy Saving Strategy with Steam-Driven Compressor

Toru Mizutani
Tokai Mill, Oji F-Tex Co., Ltd.
  At the Tokai mill of Oji F-Tex Co., Ltd, the steam generated by boilers is adjusted through reducing valves to a required pressure and supplied to each equipment. Although one of the ways to utilize the differential pressure is to generate electric power using a steam turbine, the Tokai mill does not adopt this kind of system because its differential pressure and steam consumption are not so high.
  Meanwhile, a steam-driven compressor has been introduced to the Iwabuchi and Fujinomiya manufacturing sites. One of the reasons for adopting the compressor is that paper machines use a lot of compressed air.
  The steam-driven compressor is operating smoothly, and therefore allows some electric compressors to be on standby. It has led to reducing both energy consumption and frequency of maintenance on the electric compressors.
  This paper describes the introduction effects of the steam-driven compressor.


#5 Paper Machine Dryer: Energy Saving Introducing High Dew Point Enclosed Hood System

Zenji Motoyoshi
Edogawa Mill ,Oji Materia Co. ,Ltd.

  Oji Materia Co., Ltd. Edogawa Mill is only one white board paper production plant in Tokyo metropolitan area that is located in the eastern end of this capital city. This plant has significant geographical advantages. It can be easily gathered abundant of waste paper and is also very close to the vast market. Miura Co., Ltd.
  The Edogawa Mill is running to produce white board paper with companyfs theme of gLiving together with people & local communities thereh. In this plant, #5 paper machine has started full production in May 1971 as specialized making white board paper. Current production is about130000 tons per year and the products are mainly delivered to the paper container industries.
  The dryer part out of the whole paper production process is the most energy consuming section and considered it most effective for energy saving if it can be modified appropriately. However, such modification work for the dryer part including hood system had not been realized in the past due to possibly vast investment.
  Now, we have carried out renewal of both the dryer hood and the air supply/exhaust equipment which has enabled to achieve the saving of steam and electricity. We would like to hereby explain an outline of the modification of the dryer hood system and also describe how energy saving effects was attained with it.


Efficacy of Energy Saving Project in Niigata Mill, Hokuetsu Kishu Paper Co,,Ltd.

Minoru Sakaue
Niigata Mill, Hokuetsu Kishu Paper Co., Ltd.

  Recent years, the global warming is the one of the biggest issue for us. Especially, reducing carbon dioxide emissions which are well known as a greenhouse gas is our main concern. Because of these movements, we need to expedite both the reducing fossil fuel consumption and the saving other energy consumptions at the same time. In order to approach these issues, we have started the energy saving program at Niigata mill since 1980fs and these works have brought great success. However, after we installed the new paper making machine PM9 and converted the other related processes such as the pulping, the bleaching and the chemical recovery facilities, the energy consumption surged and that cost put pressure on our profit.
  In this report, we introduce the energy saving program at the Niigata mill and give the detail of our achievements after we installed and converted the new processes.


An Operating Experience of Partial Borate Autocausticizing

Tomofumi Kogawa
Technical group, Technical department, Hachinohe mill, Mitsubishi Paper Mills Limited

  Partial borate autocausticizing (AC) is the patented technology from U. S. Borax Inc. which partially replaces lime causticizing with borate AC. In Hachinohe mill, we conducted partial borate AC by adding borate to recovery cycle from March 2010 until March 2011.
  The AC level reached up to 10%. Partial borate AC made it possible to increase white liquor (WL) production without any equipment investments. The amounts of burnt lime and heavy oil required for producing every tons of WL were both decreased.
  The cost of WL produced by borate AC was lower than the case which purchased lime was used for WL production.


Application of Biomarker Technologies for Afforestation

Nobuyuki Nishikubo
Forest Technology Laboratories, Research & Development Division, Oji Holdings Corporation

  Oji paper have been expanding the oversea plantation area to 240,000 ha until 2012. These logged trees are utilizing to make lumber, plywood and wood chips. The selection of the appropriate tree to each plantation environment is required, because it is different weather and soil conditions between each plantation. The selected excellent trees propagate by cutting and plant as clonal plantation. Therefore restrict conservation of these selected trees are important for future production, wood quality and yield ratio of lumber.
  To control production and quality, we developed identification method with SNP biomarkers. Using the SNP marker in E. pellita clonal trial and clone bank, we successfully identified and rearranged for more than 100 kinds of clones.


The Classification and Kind of Paperboard

Akihiro Yamamori and Taku Uchiumi
Oji Materia Co. ,Ltd.

  The paper and pulp industry has mainly developed at the area of printing paper. The paperboard and high performance papers have been focused in recent years due to industrial structure change.
  The production of the paper and paperboard fell off sharply after Lehman Shock in 2009 and has remained lower level in Japan. The consumption of printing paper has been decreasing year after year due to emerging of new digital device and depression. However, the consumption of paperboard has shown stable growth.
  On the other hand, the production of the paper and paperboard in the world keeps higher growth rates because of economic growth of China, India and other Southeast Asia. The presence of the paperboard has been increasing in the paper and pulp industry.
  We will describe the outline about the paperboard.


Molding of the Category of High Performance Papers
-The Technological Locus of High Performance Paper Society-

Yoshinari Kobayashi
Kagawa Prefectural Industrial Technology Center

  In 1962 gHigh Performance Paper Societyh was initially found as the name of gChemical Fiber Paper Societyh by researchers of Shikoku National Industrial Research Institute and Prefectural Paper Industry Technology Centers in Shikoku with challenging the targets of making paper from rayon and synthetic fibers. In 1982, with shift of industrial requirement the purpose of the Society was revised to research the science and technology for making papers by wet-laid from almost all kinds of short fibers, that is, natural, regenerated, synthetic, inorganic and metallic fibers. This meant enlarging the definition of paper. Reflecting on the 50 year history of the Society, the category of high performance papers was safely said to have been established for core industries in parallel with that of general use paper from plant fibers. The main accumulated technologies for high performance papers were chronologically overviewed by dividing decade years.


Report on the Results of the Fiscal 2012 Follow-up Survey on JPA's Committed Action Plan and Efforts against Global Warming in the Japanese Pulp and Paper Industry

Naoki Ikeda
Japan Paper Association

  The Japan Paper Association (JPA) has been actively working to save energy since 1997 when it established its gCommitted Action Plan on Environmenth. JPA declares its policy of restraining CO2 emissions in the action plan, and is working toward the following targets revised in September 2007:
・ On a five-year average basis from fiscal 2008 to fiscal 2012, reduce fossil energy consumption per ton of production and fossil energy derived CO2 emission per ton of production by 20% and 16% from the level of fiscal 1990, respectively
・ By fiscal 2012, expand forest plantation area owned or managed by the industry at home and abroad to 700 thousand hectares.
  Since fiscal year 1990, JPA has made a survey on the actual results of energy consumption in the year, and published its results compared with that in fiscal year 1990. This report shows the results for fiscal year 2011.
  According to the fiscal 2012 survey, pulp and paper industry's fossil energy consumption per ton of paper production and f in fiscal 2011 was 25.4% lower than the level of fiscal 1990, which is almost the same level as previous year. This is mainly thanks to manufacturersf continuous energy saving efforts and improved production efficiency through restructuring their production system, in spite of a significantly decreased production.
  On the other hand fossil energy derived CO2 emission per ton of production was 20.1% lower than the level of fiscal 1990, a 2.6 points deterioration compared to the level of fiscal 2010, due to an increased in-house power generation to address electricity shortage caused by the Great East Japan Earthquake and change in fuel mix with production shift to unaffected mills from large mills damaged by the disaster.
  In addition to the results of the follow-up survey, this report introduces the position of the pulp and paper industry in national energy consumption and CO2 emissions, and information such as JPA's Action Plan for low-carbon society and the impact of the raise in electricity prices on the industry.


What I've Learned from my Life in Germany

Satoshi Kano
Mitsubishi HiTec Paper Europe GmbH

  Mitsubishi HiTec Paper Europe GmbH (MPE) belongs to Mitsubishi Paper Mills (MPM) in Japan. In 1999 MPM assumed the majority shares in both German special paper Production sites, which are Mitsubishi HiTec Paper Bielefeld GmbH and Mitsubishi HiTec Paper Flensburg GmbH. In 2010 the German companies in Flensburg and Bielefeld have been merged to MPE.
  Two production sites of MPE operate in accordance with strict quality and environmental standards. Customers gain from the excellent Japanese research centers and internationally organized distribution network. MPE is known world-wide for its excellent quality of products, exceptional power of innovation and excellent service.


Development of High Quality Porous Fillers (Part2)
- Basic Study on Effect of Alkaline-Resistant Microparticles on Particle Properties and Paper Quality -

Manabu Yamamoto
Advanced Technology Laboratory, Oji Holdings Corporation
Hiroyuki Wakasa
Core Technology Laboratory, Oji Holdings Corporation
Hitoshi Okada
Japan Pulp & Paper Research Institute INC.

  Due to their low specific gravity, porous fillers such as synthetic silica are being increasingly used as an additive to increase paper bulkiness. The use of porous fillers has advantages such as continued utilization of existing equipment with no requirement for the installation of new equipment such as a shoe calender. Porous fillers also prevent the discoloration problems inherent with mechanical pulps and the soiling of the paper machine that occurs with the use of a fatty acid derivative or special surface-activate agent as a bulking agent. However, there are still outstanding issues such as degraded paper strength, although the level of degradation is lower than with other paper-bulking techniques currently being applied. In view of this, we conducted a study in an attempt to develop a high-quality porous filler with superior bulkiness performance, excellent opacity and minimal degradation in paper strength. In the first report, we revealed that a porous filler with minimized degradation in paper strength, high bulkiness performance, and excellent opacity had been developed by optimizing the primary particle diameter and the secondary coagulation particle diameter.
  This report reveals that a porous filler with minimized degradation in paper strength, high bulkiness performance, and excellent opacity was developed which uses alkaline-resistant
microparticles during the reaction. This enables control of primary particle diameter, secondary coagulation particle diameter, and particle size distribution.