2008年9月 紙パ技協誌
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JAPAN TAPPI JOURNAL September 2008


Vol.62 No.9 Abstracts


Review and Outlook for the China Paper Industry

Zhenlei Cao
China National Pulp and Paper Research Institute
CTAPI

   China paper industry has been growing steadily for the last decade. The total paper and board production reached 65 million tons in 2006, and the consumption reached 66 million tons, which leads to an annual growth rate of 16% and 11% respectively. Till today, there is no signal to slow down even with the harshest measure on the environment protection and energy reduction. Look into the future, the china paper industry will have relative moderate growth due to the export of consuming goods and internal consumption growth. It is only a matter of time the total production and consumption will reach 100 million tons, if not by 2010, for sure by 2015!


The Organic Polymer Coagulants for the Elimination of Pitch Trouble Part ll
-Stabilization of Paper Making Process by Inactivating Micro-Pitch Particles-

Hidetoshi Sakamoto and Kenji Sakai Shonan
Research Center, HYMO Corporation

   Cationic Polymer Coagulants is effective to eliminate pitch-trouble causing by stickies. Cationic Polymer Coagulants is able to reduce adhesive surface of stickies particle in the process water and fix stickies onto pulp fibers before growing into a large-size stickies. Cationic Polymer Coagulants decrease fixing stickies released from pulp fibers.
  We used new analysis methods, "micro-pitch image analyzer system" and "stickies image analyzer system", and we investigated the effect of Cationic Polymer Coagulants having different characteristics.
  In this report, we indicated several Cationic Polymer Coagulants synthesized by controlling the charge density, the molecular weight and the balance of hydrophilic and hydrophobic segments showed different characteristics in adsorption onto stickies, coagulation of micro-pitches and ion-neutralization of anion trash as a pitch control agent.


Nonchlorinated Decolorization Process for Fluorescent Whitening Agent

Masafumi Watanabe
Color Chemicals Division, Fine Chemicals Group, Nippon Kayaku Co., Ltd.

  We have developed new reagents called Kayaclean AW and Kayaclean IK. These are potent in decolorizing fluorescent whitening agents.
  Used paper in paper manufacturing is increasing as is the demand for its wider application. Used paper which includes fluorescent whitening agents is not suitable for some kinds of paper, for example food wrapping paper, thermal recording paper and pressure-sensitive paper. This is why fluorescent whitening agents have to be decolored. Paper-manufacturing companies generally use chlorine chemicals in the process of recycling used paper for the decoloration of fluorescent whitening agents. But this use has the problem that AOX (Adsorbent Organic Halide) might be generated, and is therefore not desirable due to environmental concerns. Thus, the need for nonchlorinated decolorization fluorescent whitening agents is growing.
  In this report, we will introduce Kayaclean AW and Kayaclean IK, which are nonchlorinated, environment-responsive and powerful reagents for decolorizing fluorescent whitening agents.


Dispersing of the Loading Filler and Pigment by Eirich Intensive Mixer

Kazuo Tomita
Nippon Eirich Co., Ltd.

   The Eirich Intensive Mixer can be applied for the dispersing of the loading filler and pigment in the field of the paper industry. Its unique design such as the rotating mixing vessel and separately driven high power mixing tool ensures the efficient mixing and dispersing. According to the current supply result, the disintegration, homogeneous mixing and dispersing of the Calcium Carbonate cakes can be managed by one Eirich Intensive Mixer in relatively short time. The mixer can handle any shape of mass from powder to slurry. Because of the high intensive power input by the mixing tool, the total dispersing time can be shorten, which realizes relatively smaller mixer size and installation space compared with the conventional dispersing facility.


TopBrane™ : Hyperbranched Polymers as Additives for Ink Jet Receptive Coatings

M. L. J. van Leeuwen
DSM Hybrane BV

   This paper deals with the application of TopBrane products as additive to Ink Jet receptive coatings. It will show how TopBrane additives can be used to enhance the print image quality and improve drying speed of the image after printing. Due to fine-tuned interaction with commonly used pigments in ink jet receptive coatings a controlled coagulation process is obtained during the application of the ink jet receptive coating. This results in improved orientation of the pigments and improved performance during printing. Furthermore the use of TopBrane in ink jet coating formulations helps to reduce the coating viscosity and helps to get to higher solids %. This enables a more efficient coatings process and reduces over all costs of operation.


The Most Modern Fiber Line

Hiroshi Yamashita
Service Dept., Metso Fiber KK

  It is getting harder and harder to get good quality chips duet to the fact that some big pulp plants have started operation recently in Southeast Asia and South America. Since low quality chips sometimes cause serious problem to digester operation, appropriate solutions to solve this kind of problem are being required. Compact CookingTM must be one of the most possible solution to cook low quality chips.
  On the other hand, when it comes to environmental issue, regulations for environment have been getting strict. This trend sometimes triggers a change of bleaching sequences, for instance the conversion from conventional bleaching to ECF bleaching. D-ECF has been very popular since the beginning of this ECF conversion. But recently more efforts to reduce environmental impacts have been required all over the world. This stricter requirement for environment makes high consistency ozone bleaching more attractive. This means Z-TCF could be a possible sequence as well as Z-ECF.
  We are going to introduce tendencies of modern sequences at some mills which meet requirements of not only raw material matters but also environmental matters.


New Technology of Wastewater Treatment System

Atsushi Nakano
Sumitomo Heavy Industries Environment Co., Ltd.

   The wastewater treatment system that applied to the pulp and paper mill is required to minimize the influence to environment, save space, save consumption, and recently to recover the electric or heat energy from treatment system. In this paper, new technologies of wastewater treatment system below are introduced.
  1) High load anaerobic wastewater treatment technology using the granular biomass
  - Biobed® system (EGSB), Biothane® system (UASB), Aqua-SAT® system.
2) Space saving wastewater treatment systems which combine Sumi-thickener®
  coagulation process and activated sludge treatment process - Sumi-Sludge® system.


Introduction of Digital pH Sensor

Yasuo Watanabe
Mettler Toledo K.K. Ingold Business Unit

  Last year, Mettler Toledo introduced the new technology sensor which is called "ISM sensor". This year we would like to introduce the advanced sensor "Digital pH sensor" and show the background of development and the benefit of this sensor.


Inspection Trend in Printing Industry
-Transition of Quality Demand Seen from Inspection System-

Tohru Kojima
Strategic Planning Group, FUTEC INC.

   Futec Inc. has sold around 5,500 Inspection Systems to such Paper Pulp Industry, Film Industry, Nonferrous Metal Industry, Non-woven Fabric Industry and Printing Industries, etc. for 30 years.    Futec Inc. developed the new Printed Web Inspection System EasyMax. GS which is the corpus of year 20 based on the know-how that has been cultivated and the needs/ wishes obtained from the market.
  Futec Inc. introduces the feature of this latest type Inspection System and transition of quality demand of printing quality.


Renovation of Underground Existing Pressure Pipeline

Masahiro Seshimo PALTEM, GEO Engineering Unit Safety & Fibre Protection Equipment, PALTEM, GEO Company Ashimori Industry Co., Ltd.

   A large number of pipes are used in various fields and places to improve the industrial efficiency. There are many kinds of pipes such as for gas, industrial water supply, drainage, and oil. Also these are now deteriorating by aging. The PALTEM HL method is the crafting technique for the prolongation of lives of such aging existing pipes, prevention of leakages of pipes, reinforcement of pipes, and renovations of pipes to add quake resistance to it. This report is about the background of the PALTEM HL method as a crafting technique of renovation for the underground existing pressure pipelines.


The Characteristics of the Technology of the Japanese Paper Industry

Kiyoaki Iida
Preserving and Publicizing Technical Archives and
Heritages of the Japanese Paper Industry

  The definition of the technology for the industry is not clear enough. So, the definition is proposed as technology needed to develop productive activity in industries, which requires technical knowledge and know-how as its background. The technology can be divided into several categories based on productive activity. By analyzing it in each category, the technology for the industry as a whole can be characterized. The Japanese paper industry was taken as a sample for the analysis.


A Report on 2008 International Pulp Bleaching Conference

Tomoya Yokoyama*1, Koki Kisara*2, Iori Tomoda*2, Kazuhiro Kurosu*3, Shiho Katsukawa*3, Kiyoshi Yoshida*4 and Hitoshi Takagi*5

*1 The University of Tokyo
*2 Oji Paper Co., Ltd.
*3 Nippon Paper Industries Co., Ltd.
*4 Mitsubishi Gas Chemical Co., Inc.
*5 Japan Pulp and Paper Research Institute, Inc.

  The 2008 International Pulp Bleaching Conference was held in Quebec City, Quebec, Canada from June 2 to 5. The 35 oral presentations including six Japanese papers and the 18 poster presentations were made at the conference. The topics of oxygen delignification, chlorine dioxide bleaching, ozone/peroxide based bleaching, enzyme, other bleaching processes, brightness reversion, fiber properties and bleaching effluents were reviewed.


Surface Analysis of Papers Treated with Corona Discharge

Kazuko Sugimoto
Odawara Plant, National Printing Bureau
Yasushi Ozaki
Research Institute, National Printing Bureau

   Partial surface modification of printing papers can be made by corona discharge treatment with masking. Consequently, it is possible to change the wettability on surface modified portions. It is expected that this technique can be applied as a new representation of image.
  In this work, coated papers and wood-free paper treated with corona discharge were analyzed by contact angle measurement, scanning electron microscopy (SEM), scanning probe microscopy (SPM) and X-ray photoelectron spectroscopy (XPS).
  Some hydrophobic groups (C-C, C-H) were changed to hydrophilic groups (C-O, COO) through the oxygen incorporation of the corona treatment. Moreover, a part of the binder or surface sizing agent on the papers disappeared. In addition, the morphology of the printing paper was also changed by the corona treatment. Synthetically, these phenomena improved the wettability on printing papers.

Keywords: corona discharge treatment, surface modification, coated paper, XPS, SPM, SEM