2003 Jan JAPAN TAPPI JOURNAL

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JAPAN TAPPI JOURNALVol. 57, No. Novuary 2003 Abstracts


The Latest Improvement for High Consistency Pulper & Detrashing and Sticky Contamination Analyzing Equipment "SCAN"

Takeshi Kanazawa
Aikawa Iron Works Co., Ltd.

 High consistency pulping providing a helical rotor and detrashing performance (This technology was first developed by Aikawa in the world about 25 years ago.) is now recognized as one of the best technologies for deinking system, and many stock preparation machinery suppliers are manufacturing similar equipment globally. Recently this technology has been dramatically improved, specially for energy saving and contaminant removal, and was awarded Sasaki Prize by Japan Tappi on 2002 as the best development of the year. This paper reports about the latest technology for the High Consistency Pulping and Detrashing System and also reports for interesting equipment to analyze sticky materials contained in the stock, which is called " Stcky Contamination Analyzing Equipment, SCAN".


The Practical Examples of Paper Machine Operation Using "MOAS"
Noboru Negishi
Sinko kagaku Co., Ltd.
Youhei Shiokoshi
Nippon Paper Unitec Co., Ltd.

 The technique to take the real-time data of wet paper web moisture and the two parameters -" Heat Transfer Rate Coefficient "and" Pressing Coefficient "- which related to the moisture makes it possible paper machine to be controlled reliably and precisely, and improves the productivity.
 Additionally, the accumulation of time−series files which contains simultaneously moisture data at different parts of paper machine, above−mentioned parameters and general operation data leads to systemize quantitatively the reason for moisture variations. This systemization standardizes the control action which traditionally based on experiences or subjective factors, and rationalizes significantly paper machine operation.
 "Heat Transfer Rate Coefficient" and "Pressing Coefficient" are the specific factors in "MOAS" ; "HTRC" is the specific characteristics of paper which resulted from furnish composition and wire retention, affecting hydrokinetically to dewatering performance at press section. "PC" reflects quantitatively the dewatering performance at each press section.


Carbon Thinks as a Measure against Global Warming
Naoto Haraguchi
Overseas Forestation Dep. Raw Materials & Purchasing Div. Oji Paper Co., Ltd

 This article illustrates the possibility of contribution to the measure against global warming by Japanese Pulp and Paper industry and overseas forest plantation.
 While the vast majority of pulp wood used in paper making originates from saw mill residues and thinning, the industry has made a commitment to expand overseas forest plantations in order to secure wood supplies and to contribute to the world’s environment.
 Japanese Pulp and Paper companies together plan to establish 550,000 ha of forest plantations, both inside and outside Japan by year 2010. As for Oji Paper Co., Ltd, it has a goal to establish 200,000 ha of overseas forest plantations by 2010. Overseas forest plantation projects not only create jobs, but help the area in environmental improvements such as reduced salinity and reduced wind erosions. In addition, cultural exchanges between Japanese expatriates and locals take place. Recently, carbon absorption by forests is drawing more attention toward forest plantations. While it is not clear how carbon absorption is accounted and valued, Oji plans to help other companies which plan to develop overseas forest plantation projects. Overall, forest plantations mean recycling of wood, reducing the use of fossil energy while lessening the pressure to clear natural forests.


Operate a Boiler System Designed to Combust Paper Sludge in Combination with Chip Rubbish- Contribute to the Community, Conversion Fossil Fuel and Reduce Energy Costs -
Yousuke Makita
Power Section Tokai Pulp & Paper Co., Ltd.

 In recent years Tokai Pulp & Paper Co., Ltd. has made a concerted effort to improve the natural environment, such as minimized the effect of the solid waste that is released into the city. This means to increase wastepaper utilization rate, and maximize the uses of recycled paper.
 During the process of minimizes its impacts on the environment, the increased of manufacture waste is also generated. With paper sludge/ chip rubbish steam plant in place (number 10 boiler), Tokai Pulp & Paper Co., Ltd. in now able to use the majority of its paper sludge by-produce, reducing both energy and disposal costs. By using the paper sludge and chip rubbish as a fuel, Tokai Pulp & Paper Co., Ltd. minimizes its impacts on the environment, reduces reliance on fossil fuel related greenhouse gas emissions, and stability of the power generation.


Trial Plantation of Eucalyptus globulus Using Clonal Technology in Australia
Toshiaki Tanabe
Forestry Resources Australia office, Pulp and Paper Research Laboratory,
Nippon Paper Industries

 Nippon Paper Industries has been developing the clonal propagation technology of E. globulus by micropropagation to supply a high yield, quality, survival rate and uniformity for plantation purposes. In 2000, our research laboratory was established in Collie, Western Australia in order to try to produce clonal plantlets by micropropagation. A photoautrophic culture in the rooting stage produced more than ten thousand vigorous rooted-plantlets and enabled us to work the culture under non-aseptic conditions. A low temperature plant tissue storage method propagated enough shoots to provide for rooting with a regular amount of work in the shoot propagating stage. These methods technically and economically improved micropropagtion of E.globules for practical use. The micropropagated plantlets were planted in plantations in Victoria and Western Australia. They have shown healthy growth without any problems for the initial period.


Procedure for Obtaining CoC (Chain of Custody) Certificate of FSC Forest Certification System in Mitsubishi Paper
Mills Limited Hachinohe Mill
Hiroaki Niwata
Hachinohe mill,Mitsubishi Paper Mills Limited

 Mitsubishi Paper Mills Limited (MPM) Hachinohe mill obtained Chain of Custody (CoC) certificate under the rules of the Forest Stewardship Council (FSC) by Scientific Certification Systems (SCS), organization approved to submit FSC certificate.
 FSC Certification system is NGO based forest management certification system and CoC certificate qualifies the products coming from well-managed forests.
 With obtaining CoC Certificate, Hachinohe mill are allowed to put FSC-Logo on it's certified products, such as coated paper and fine paper of which at least 30% of virgin fiber comes from well-managed forest.
 The field inspection for Hachinohe mill was conducted on 14 July, 2001 by inspectors of AMITA Corporation, Japanese representative of SCS, after spending 2 months on designing control system and documentation according to the CoC standard. The CoC certificate based on the assessment report was issued to MPM Hachinohe mill on August 20, 2001.
 This year, the CoC certificate for Hachinohe mill was expanded to include the sales division and logistics division. Now MPM can manufacture and sell FSC-certified coated paper and fine paper.
 MPM is working to obtain FSC forest management certificate for MPM’s own plantation in Chile and FSC certified wood chip will be shipped from the plantation by 2003.


Exhaust Gas Treatment System for Ozone Bleaching Process
Junji Kitatani
Kitakami Mill , Mitsubishi Paper Mills Limited
Hiroshi Sanui and Kazuho Iwamoto
Market Development, Nippon Sanso Corporation

 Reuse of the oxygen in the exhaust gas from ozone bleaching process is an available technology for chemical saving. To use the residual oxygen effectively, it is necessary to destruct the residual ozone, and to refine oxygen. In this paper, we will introduce the newly developed exhaust gas treatment system for ozone bleaching process.
 This system is composed of a packed type absorbing tower, pumps and fans. And for absorbing agent we use alkali in the kraft pulping process, which contains sodium sulfide for ozone destruction and caustic soda for carbon dioxide absorption. This system is very simple, and almost free from corrosion, and the maintenance is easy. And also as an ozone destructor, both equipment cost and running cost are cheaper compared with the heating type one. These points are also discussed in this paper.


New Process Producing Highly Concentrated Polysulfide Liquor (II)
Keigo Watanabe and Yasunori Nanri
Nippon Paper Industries Co., Ltd., Pulp and Paper Research Lab.
Tatsuya Andoh
Kawasaki Kasei Chemicals Ltd., Research and Development Center
Yoshitsugu Shinomiya
Chlorine Engineers Co., Ltd., Engineering dept.

 A new electrolytic process to produce highly concentrated polysulfide (PS) liquor from the white liquor has been developed. This electrolytic process can provide two different compositions of cooking liquor, not only electrolytic oxidized liquor (EOL) but also caustic soda, from the white liquor (WL) in the process. By adding the EOL to the digester, a great improvement of pulp yields can be obtained and required active alkaline can be reduced. In addition, combination use of the electrolytic cell and modified cooking (MC) enhances both effects of EOL. But a mill scale has not been realized because of high capital investment and large electricity for electrolytic process.
 To optimize the combinatorial use of EOL and MC economically, optimum balance of PS and sodium sulfide in PS cooking liquor were discussed in this paper. Consequently the amount of WL to be oxidized with electrolyzer was reduced. Also a new electrolyzer was tested in long term. Successful results of the operations with pilot-scale are shown in this paper. This new electrolyzer is expected simple enough even in practical mill scale.
 Through the optimization of the way of cooking, it is found that whole WL does not have to be oxidized with electrolyzer. As a result of the development of new simple and compact electrolyzer with high efficiency, required electricity was economized and space for installation was reduced and acceptable capital investments will be achieved.


Mechanism of the Fluting of Coated Paper in Web-Offset Printing? Approach from Design of Paper to Improve ?
○Tetsuya Hirabayashi, Yukiko Suzuki, Yukio Tani and Daisuke Watanabe
Pulp & Paper Research Laboratory, Oji Paper Co., Ltd

 In relation to the recent rapid development of web-offset printing, fluting in web-offset printing is becoming a serious quality issue requiring an urgent solution. Our study on this issue identified that fluting in web-offset printing is a phenomenon where an imaged area had been buckled by a compressive force caused by a combination of tension and contractile force during the printing operation. Also, the number of the fluting in web-offset printing is determined by the compressive force, the size of the imaged area and the stiffness of the paper
 On Dec. 2001, we started to produce a new paper product which is free from the fluting in web-offset printing on. It’s designed to have small contractile force which is occur by drying of web-offset printing process.


The Development of functionality sheets- PBO (Poly(p-phenylene-2, 6-benzobisoxazole)) fiber sheet -
Hajime Tsuda
Technical Research Laboratory, Tomoegawa Paper Co., Ltd.

 We have developed several types of functionality sheets made with polymer fibers and metal fibers using the wet paper making technique. We have recently developed the Poly (p-phenylene-2, 6-benzobisoxazole) (PBO) fiber sheet for printed circuit boards.
 This PBO fiber (ZYLON) is made by TOYOBO CO., LTD. and has excellent properties such as high tensile strength, high tensile modulus, low moisture content and high thermal resistance.
 This report presents the way of making PBO fiber sheet, it’s property and PBO pulp which is needed to make the PBO fiber sheet.


Barito Project, Operation Experience Pulp Manufacturing from Acacia Mangium
Kazuyoshi Noguchi
Production Manager PT TEL Musi Mill (Indonesia)
Satoshi Fujita
Mill Manager PT TEL Musi Mill (Indonesia)

 The first large scale plantation of Acacia Mangium was begun 1991 at Province of South Sumatra, Indonesia for the first time, by a Joint Venture Company composed by PT. Barito Pacific Timber Corporation (BPT) and Forestry Ministry of Indonesia.
 And a construction of a new Pulp Mill was started by a Joint Venture Company between Indonesian and Japanese consortium. Nippon Paper Industries Co., Ltd. participated in this project to provide technical and production assistance to this mill for the long term of contract.
 The Mill construction was begun September 1997 and completed November 1999, and trial operation of the mill was consequently conducted May 2000, the commercial production begun after the commercial transfer of a key to the Mill Manager. It is our pleasure to have an opportunity to introduce the outline of the Mill and a story from our experience.


Operating Experience of 9 PM
Katsuhito Minami
Geibo Mill, Japan paperboard Industries Co., Ltd.

 The 9PM for board paper has been started operation at Geibo mill in Apr. 2001. This was a substitute for the Osaka mill which was closed down in Dec. 2000 under the reorganization of the board paper industry.
 The production capacity is 494 t/d. The wire’s width is 5100mm and the operating speed is max 550m/min.
 Also the machine has some characteristics. For example high temperature and high consistency disc dispersion system, shoe presses, JF sizer etc. So we are able to supply the best quality board paper for the user.
 I’d like to report an outline of this machine and the operating experience since it was started up.


Operating Experience of High Brightness DIP System
Keisuke Irikawa
Daishowa Paper MFG. Co., Ltd., Honsha Mill Fuji Div.

 In Daishowa Honsha Mill, Fuji Division, we have 3 lines of DIP process which amount of product is 630t/d. The current High-Brightness-DIP process, start running from September 2000, makes it possible to brighten 75% of DIP.
 In here we have Sprit-Flotation System, which is first trial in Daishowa. This process is able to intensify ink rejecting by flotation cell, which set up in front and back of hydrogen peroxide bleaching. This system can discharge ink before it break up into minute particles, like less than 2μm. Therefore, it is effective for manufacturing high brightness DIP. Now, we use mixtured of old newsprint and old magazine, however, from the good result of our new process, we are able to make the best use of any waste papers.
 In this report, we will introduce system, operation experience and quality of our New-DIP-Process of this two years.


Starting Up of Onsite PCC Plant and Experiences of Neutralized Paper Making
Munetaka Aoyama
Shiraoi Mill, Daishowa Paper Co., Ltd.

 Daishowa Paper Shiraoi Mill completed onsite Precipitated Calcium Carbonate (PCC) manufacturing facility in June, 2000. We have planed to transfer from acid to neutralized paper making in all paper grades except for news print and liner board. PCC is used to make neutral paper and the decision was made to build an onsite plant. A PCC manufacturing and supply agreement was signed with PCC manufacturer, Specialty Minerals FMT K.K. (SMF), in the summer of 1999.
 Specialty Minerals Inc. (SMI), a parent company of SMF, has an excellent reputation as a producer of high quality PCC and is the largest producer with 2.1milliion tons of PCC at their 55 plants located around the world.
 In general, neutralized paper making can provide many advantages including less degradation over time, higher brightness and opacity, and better printability. On the contrary, some disadvantages include difficulty in keeping machines clean, ink feathering, and high costs. Because of these disadvantages, we have limited to apply neutralized paper making to PPC paper and special grade of fine paper. We, however, were able to overcome these technical problems and, with the exception of newsprint, we have decided to neutralize most paper grades.
 At this time, we would like to present a general description of on site PCC plant, and PCC characteristics. Also, we would like to present our experiences in the transfer from acid to neutralized paper making.