|JAPAN TAPPI JOURNAL August
Vol.62 No.8 Abstracts
-A History of Sleeve Development at Voith-
Domestic Sales Department, Voith IHI Paper Technology Co., Ltd.
Voith Paper established the closed shoe press and press sleeves 24 years
ago. Due to that it was possible to increase speed and meet special requirements
on the paper making side. Because of the risen cost for energy, energy saving
is one key factor for business success nowadays.
To achieve the best results
concerning dewatering it is necessary to customize the sleeve surface for
each application. QualiFlex offers the widest variety of surface designs to
meet this requirement. With the development of new polyurethane types it is
possible to create steady state conditions over a long lifetime period. Since
1989 QualiFlex is the only product worldwide based on yarn reinforcement,
totally embedded in one single layer of polyurethane.
Brazilian Eucalyptus Pulp
Ludwig Johann Moldan
Brazil pioneered the industrial-scale production of both eucalyptus pulp as well as paper 100-percent made of eucalyptus pulp exactly 50 years ago, thanks to the creativity and technical knowledge of our engineers.
The introduction of that new fiber into the market was a tough job right in the beginning, yet highly rewarding afterwards.
Investments in forestry research almost doubled its productivity leading Brazil to a benchmarking position in the area.
Massive industrial investments in advanced manufacturing facilities started to be made at the end of the 1970fs aiming at supplying the world market with short fiber pulp.
Since then, Brazil has been investing in its production, becoming now the leading producer in eucalyptus pulp and the worldfs sixth largest in general pulp production.
Brazil enjoys a significant competitive edge in forestry techniques, with state-of-the-art technological development, therefore reaching high productivity rates at competitive costs, totally tuned to sustainability principles, according to the social, environment and economic tripod.
The ongoing development of the industry in Brazil reflects its worldwide recognition by the most demanding marketplaces in Europe, North America, as well as in Asia.
The current investment program for the period 2003-2012 forecasts that as much as US$14 billion will be invested in forestry, pulp and paper, half of it already done.
The high productivity of our planted forests has been leading us to consider other wood applications, such as its use as solid wood, or even for ethanol production, while never forgetting that our main product is pulp.
Clean Paper Machine Operation by Proper Wet-end Chemistry
Koichi Tadaki, Tomoko Asada, Hideaki Kawakami, Kazutaka Kasuga and Shigeru Kurose
Technical Dept., Somar Corporation
Cleanness of paper machine operation has been transformed drastically due to deterioration of raw material quality and conversion to neutral condition. Main source of stain on the machine comes from un-wanted foreign materials contained in de-inked pulp, as its usage has tendency to increase. To maintain or even to improve machine runability and production, it is important to deal with materials causing unclean operation.
In the past we have tried to identify un-wanted foreign materials in paper machine through chemical and biological analyses, and, at the same time, made a selection of proper chemicals to deal with these materials. Continued development of high-performance coagulant gREALIZER A Seriesh showed its effectiveness to hydrophobic pitch in recycled pulp. Retention aids effective on microscopic particles such as pulp fines and filler were developed as gREALIZER R Seriesh and gREXER FX Seriesh. Combination of these chemicals called gAXISZ SYSTEMh reforms wet-end operation much cleaner environment, which has been recognized by a large number of paper machines. New generation of ASA sizing agent gREGSISh which was put in the market last year requires less chemicals and thus contributes optimization of wet-end operation. In addition gCURECIDE SYSTEMh which controls micro biological problems, further reduces deposits in a paper machine. Both chemical and biological means of controls improve drastically paper machine as clean operation.
Effect of Filler Distribution on Paper Properties
Research and Development Department, Paper Chemicals Division
Arakawa Chemical Industries, Ltd.
From the viewpoints of forest resources conservation for the protection of global environment and reduction in paper cost for enhancing its competitiveness in the international market, paper manufacturing companies are promoting to increase the content of DIP and inorganic filler in their paper products. However, this causes a decrease in strength of the finished papers.
This report describes the effect of dispersed condition of fillers in paper on such paper properties.
A Study on Sheet Gloss of Coating Color Only Using Calcium Carbonate
Latex Research Group, R&D Center, Nippon A&L Inc.
In coated paper, the tendency of investigation is not only improvement of qualities and productivity but also cost cut of coating color. High calcium carbonate contents would provide both higher brightness and lower color costs. However, it would be also difficult to obtain sufficient sheet gloss of coated paper.
In this paper, the effect of color recipes and latex types to sheet gloss would be described. Use of carboxymethylcellulose and higher solid contents gave higher sheet gloss and poor water retention in the coating color, which was only used calcium carbonate as pigment.
In the simulation of de-watering phenomenon at coater head, calculated high shear viscosity was not so high compared with that of kaolin/calcium carbonate coating color. However, use of suitable amounts and type of viscosity modifier might be required, because calculated solid contents was very close to solidified concentration of coating color.
In this color recipe, higher sheet gloss obtained by use of larger particle size of SBR latex, though water retention was poor. And better water retention was provided by latexes, which contain higher carboxyl and functional groups, without decreasing sheet gloss.
From above results, we would like to recommend to use of carboxymethylcellulose, higher solids contents and use of the latexes, which have suitable particle size and higher content of functional group.
Surface Sizing Inducing Microscopic Phase Separation
Shiro Umeuchi, Eiji Hamaya, Hideo Baraki and Hiroharu Kawano
Research and Development Division, SEIKO PMC Corporation
Recently, neutral papermaking and increase in the usage of recycled pulp containing calcium carbonates have been proceeding in Japan. Accordingly, dosages of alum are decreased and its activities as cationic sites are also reduced, especially in a higher pH range. And larger amounts of fillers such as calcium carbonate are filled in neutral papers. Under these circumstances, conventional surface sizing agents do not work well, because of the sizing mechanism by electrostatic interaction arising from ionicity.
Thus, we have developed a novel surface sizing system, which is less affected by changes in papermaking pH and filler contents in paper. This surface sizing system consists of newly developed polymer based anionic surface sizing agent (SS) along with modified polyacrylamide based surface strength agent (surface PAM), and shows excellent sizing performance with minor effect of calcium carbonate contents in paper, even for the no alum system.
In order to understand the surface sizing mechanism of the novel system above, we carried out model experiment with use of the cast-coated and spin-coated films of surface PAM and SS, and SS only. Optical microscope and atomic force microscope (AFM) analyses on the films revealed that the films of surface PAM and SS have micro/nano-scale irregular surface structures like sea-island morphology due to phase separation. And they also showed higher contact angles than the film of SS only. Thus, it is suggested that microscopic phase separation may induce the surface sizing performance.
The Latest Fiberline Technology of Andritz
-Advantages and References-
Project Engineering Group, Andritz K.K.
So-called Kamyr continuous digester was invented by Johan Richter a great Norwegian inventor more than 50 years ago, of which key component was the special chip feeding rotary valve called High Pressure Feeder (HP feeder). While this HP feeder was unique in its design, its drawback is the complicated chip feeding systems and the very high maintenance cost.
Andritz has made many improvements for the kraft pulping technology. One of the epoch making improvements by Andritz is the gTurbo FeedTM System which has eliminated the conventional HP feeder completely and has so much simplified the total digester chip feed system. This gTurbo FeedTM Systemh does not require many of the conventional equipment other than HP feeder, such as Low Pressure Feeder, Steaming Vessel. Turbo FeedTM Systems have been very quickly and well accepted at many mills all over the world only a few years after its first commercial system in 2002.
In addition Andritz has further developed Lo-SolidsTM Cooking technology to so-called DFLS Lo-SolidsTM Cooking which enables the digester to operate more stably and more easily with good in-digester washing, to expand production capacity and to give better quality of pulp. Andritz has delivered so many DFLS Lo-SolidsTM Cooking digesters for new projects and also for upgrading existing digesters.
Another Andritz technology that is widely accepted by mills is DD Washers. It has shown that the bleach processes with DD washers save bleaching chemicals. Andritz has delivered significant total mill projects all over the world. Also in Japan, a brand new fiberline including above mentioned equipment has been delivered to Marusumi Paperfs Ohe mill in Ehime, Japan, and the fiberline successfully started up in May, 2007.
Process for Manufacturing Solid-fuel Derived from Waste
Planning Section, Environmental & Recycling Plant Planning Department,
JFE Environmental Solutions Corporation
Refuse derived fuel so-called RDF manufactured from municipal solid waste is utilized as a substituted fuel for various boilers. This paper describes a manufacturing process and its characteristics developed by JFE Engineering Corporation. The specific feature of our process is to settle a drying step before sorting of the materials in order to ease the separation of objectives from wet and sticky wastes. The fuel produced through the steps of shredding, drying, sorting and pelletizing to be cylindrical shape has great characteristic advantages of a high calorific value of 16,500 - 23,000 kJ/kg, low moisture and ash content, stiffness and uniformity.
JFE Engineering and its subsidiaries have supplied 23 facilities of RDF production; one of those is the biggest capacity having 300 t/d, which bring the group at present as the top supplier for both the number of facilities and the amount of total capacities in Japan.
SUCCESS FORMER for High Speed and Wider Machine
Hideki Sano and Yasuhiro Kato
Paper Machinery Engineering Dept., Kobayashi Engineering Works, Ltd.
Not only corresponding to the change of paper machine usersf needs, but also creating needs by ourselves, we have been developing various kinds of sophisticated Formers.
In response to the customersf strong expectation of the advent of new former in paperboard industry, Success Former was developed in 1989. It has enabled to achieve both remarkable quality and productivity improvement.
Because customersf reputation of this Former is still very high though ten years or more have already passed since it was developed.
We introduce the Success Former including headbox with Octopus CP control system, of wire width 6000 mm and 300,000 tons of annual outputs, which was installed in China.
Preparation of Hydroxyapatite from Paper Sludge Ash (PS ash)
Satoru Fukugaichi and Masaaki Morikawa
Paper Industrial Research Center of Ehime Prefecture
Shouichi Kyougoku and Kosaku Nagashima
Naoto Matsue and Teruo Henmi
Faculty of Agriculture, Ehime University
PS ash contains large amount of calcium carbonate. Calcium ion disturbs formation of zeolites from PS ash, resulting in that synthesizing zeolites was difficult. We synthesized both hydroxyapatite and zeolite from calcium carbonate and meta-kaolin in PS ash in the one batch system. The products were analyzed by XRD and the main component of product is hydroxyapatite and zeolite. Scanning electron microscopy relived that two components are incorporated in molecular level, showing a possible nano-composite materials. The products have been tested for ability in adsorption of acetaldehyde and methylene blue.
New Generation of WIS with Color Technology
Norikazu Ishijima and Tadashi Tomomura
Quality-System Solution Division, IT Solution Business Division, Omron Corporation
OMRON has developed printed web inspection system with color technology, at 1992. It was improved for general paper, and gColor Ageh has been sold for paper industry. Color processing technology has been improved continuously for about 15 years, and gColor Version of Super NASPh has completed. In this report, we are trying to explain the latest technologies, which have been applied for gColor Version of Super NASPh.
An Adaptive Solution in Laboratory Automation
Paul M. Crawford
The Technidyne PROFILE/Plus is designed as a modular system. It is a unique approach to the process of automating a laboratory. The PROFILE/Plus has been implemented in many installations. The method of implementation varies greatly. Many installations began as two or three instruments with additional instruments added at a later date. Many of the instruments are currently used as individual instruments with plans for automation in the future. Other installations have been full featured systems installed during the initial process as the budget provided while others have installed and later reconfigured their systems as their testing needs changed. This wide variation is a testament to the PROFILE/Plus concept, its affordability and flexibility. If the paper mills testing needs change, initial investment is not lost. Simply add, change or move instruments to meet the new testing requirements.
A New Detection Method of the Fluorescent Whitening Agents Contained in the Paper Packing Container for Foodstuffs
Takayuki Jikibara**, Chen Ying Tang, Eishun Tozaki and Takashi Miyagawa**
Material Analysis Center, Oji Paper Co., Ltd.
We examined new detection methods of fluorescent whitening agents contained in paper packaging containers for foodstuffs, and compared Japanese regulations with those of foreign countries to fluorescent whitening agents. A remarkable difference was found between results from the Japanese official method, Kanshoku No.244, and the EUfs standard method, EN648. Under the test condition of Kanshoku No. 244, a piece of gauze is dipped into an extract from the dyed sample with fluorescent whitening agents and observed the fluorescence under a UV lamp. It was confirmed that the dyeing ability to the gauze varied among fluorescent agents and an ability of hexa-sulfonated agent was extremely week, while these agents were enough detectable under EN648fs condition. Such difference in the dyeing ability may produce the difference results by Kanshoku No.244 and EN648. We tried to improve the dyeing ability of hexa-sulfonated agents to gauze in Kanshoku No.244, however, these attempts were unsuccessful. We modified the test condition of EN648 and established a new method by using the standard agents specified by the Japan Dyestuff and Industrial Chemical Association. This method can be applied to every food type@and detect hexa-sulfonated agents.
Keywords: kanshoku No.244, EN648, fluorescent whitening agents, gauze, dyeing ability, hexa-sulfonated agents
**Present organization: Japan Pulp & Paper Research Institute, Inc.