October  2007  Abstracts

Latest Technology of GL&V/KAWANOE

Brian J. Gallagher
GL&V Pulp Group Inc.

  The name GL&V, which stands for Groupe Laperriere & Verreault, is not yet very well known in the Pulp and Paper Industry around the world, but it is a company made up of many familiar names in the industry. Companies such as IMPCO, Beloit Pulping, and Celleco are now all part of GL&V, and these have been combined to create a supplier with a complete and broad range of products for the industry.
  GL&V is now working together with Kawanoe Zoki to serve the Pulp and Paper Industry in Japan. Besides selling new equipment, Kawanoe Zoki and GL&V are ready to support all existing equipment previously sold by IMPCO, Beloit Pulping, or Celleco.

Preventive Measures for Spots Caused by Dryer-fabric Deposit

Daiki Hosaka
Sales Engineering Dev., Maintech Co., Ltd.

  Spot problems originate from deposition of pitch, stickies and latex in the dryer section is becoming a critical problem under high recycled pulp furnish, closed system and alkalization conditions. These spots lead to production and quality problems such as an increase of broke and joint work. To date, not a few pitch control programs have been tried, high-pressure fabric (canvas) showers have been developed. However none of them have met with industry-wide acceptance.
  Maintech has developed a spot prevention program, a total solution that passivates all surfaces in the paper machine where the deposition could increase spots. The resulting surface passivation prevents depositions on wire, felt, press rolls, cylinder, fabric and calendar rolls and drastically reduces the number of spots on paper. Mills can take considerable advantage of this program. Elimination of deposits in the paper machine reduces not only the number of joints in the finished rolls but also reduced tonnage and down time for M/C cleaning. This paper reviews an investigative method of spot generation from dryer fabric deposition. Case histories illustrating benefits in news print and liner board M/C are presented.

Defoamer for KP
-FOAMLEX E Series-

Mitsuru Komatsu, Takashi Tanaka and Yuichi Tomoda
Paper & Pulp Group, Specialty Chemical R&D Department,
Research & Development Division, NICCA CHEMICAL CO., LTD

  Recently, anti-foamer agents in Kraft-Pulp process are significantly required high performance and efficiency. Their bases are moving from mineral oil to silicone compound.
  We, Nicca Chemical Co., Ltd., developed and launched a silicone emulsion anti-foamer agents, named Foamlex E series. The main content of these agents is the modified silicone, which is the mixture of the silicone compound and our own surfactants manufactured with unique self-emulsifying process and doesn't remain in the pulp. Foamlex E series effects high performance for anti-foam, good emulsion stability and reducing black liquid in pulp during filtration.
  We continue to develop of these anti-foamer agents in KP process based on modified silicone emulsion to provide unique characteristics and high performance in a paper and pulp industry.

Effects of Alkyl Chain Structures in Alkyl Ketene Dimer (AKD) Sizing Agents on Paper Properties and Machine Runnability

Kazuki Nagao, Hitoshi Ando and Tetsuya Hara Research and Development Division, SEIKO PMC CORPORATION

  Alkyl ketene dimer (AKD) emulsion sizing agents have been widely used in alkaline papermaking systems for various paper grades from slack-sized to hard-sized papers. Various kinds of AKD sizing agents have been available in Japan. These sizing agents contain AKD waxes with different chain lengths of linear alkyl chains as raw materials. Recently, we have developed novel sizing agent of liquid-type AKD with branched alkyl chains and placed it on the market in Japan. Selections of AKD sizing agent appropriate to each grade of papers and papermaking conditions are crucial to improve paper properties and machine runnability. Thus, to do this, it is important to understand various kinds of available AKD sizing agents including liquid-type AKD. In this paper, physical properties such as melting point and crystallization temperature of AKDs themselves with various chemical structures and their hydrolysis products are described. The physical properties of their emulsion sizing agents are also described. Then effects of chemical structures, i.e. chain length and topological structure, on paper properties such as sizing degree and friction coefficient and on the lamination coating in the finishing process are discussed. Finally combination usages of AKD sizing agent and other paper chemicals such as cationic polymers are exemplified.

Introduction of TAPIO Analyzers
- PMA, TS-profiler, and Lab profiler BCX -

Yoshiyuki Kawabata
Customer Service, NOMURA SHOJI Co., Ltd.

  To reduce variation in product quality in paper production field is one of the most important control items to win in the tough competition in the global market.
In the product range of "TAPIO Profile Analyzer" supplied by TAPIO Technologies Oy, a paper analyzer manufacturer in Finland, they have a line-up of PMA (Paper Machine Analyzer), TS-Profiler and BCX.
  Those analyzers catch not only variations in CD direction as well as MD direction but also find out and sort out variations which are complicatedly entangled in both CD and MD directions from seemingly irregular variations, and provide users of the analyzers with useful and effective measures to locate and give solutions to a questionable part in the paper machine that has produced a cause of quality variations, and also review control parameters for their optimization.
  TAPIO Profile Analyzers have been introduced in not only many paper mills in the world but also major paper machine manufacturers such as Metso and Voith. The measurement method with TAPIO Profile Analyzer is widely adopted as defect standard in the paper industry and as a standard measurement method to verify performance specifications for a new paper machine and a rebuilt machine as well.
  This article introduces the outline, features, difference and advantage from the conventional methods, analysis method, and typical problems found from the measurement results.

Octopus Stock Approach System

Masaaki Inaba and Norihito Toda
Kobayashi Engineering Works, Co., Ltd.

  Making the paper's basis weight profile in cross direction as even as possible, is one of the most important common needs in paper making, printing and converting processes.
  Octopus Stock Approach System (Octopus) with compact and easily accessible design, has become a dilution control system to be applicable not only to multi-ply paperboard machines but also to modern high speed paper machines.
  In the north American countries, more than one hundred units of Octopus are in operations, supplied by KADANT-AES, our licensor of the system in U.S.A..
  In Japan, 4 units of Octopus of 3 mills are now in operation successfully beyond our customers' expectation. Another several units of Octopus will be started up within next year including China's latest brand new linerboard machines.

Anaerobic Treatment of Various Wastewater from the Process of Manufacturing Pulp

Shigeru Noritake and Seiji Imabayashi
Asahi Breweries Co., Ltd.
Kazuo Kamiji
Asahi Beer Engineering Co., Ltd.
Hitoshi Kagawa, Atsushi Tanaka and Hajime Takahashi
Oji Paper Co., Ltd.
Fumio Obama, Akinori Kato and Atsushi Shimamoto
Sumitomo Heavy Industries Co., Ltd.

  Usually, aerobic treatment is applied to the treatment of wastewater from the process of manufacturing pulp. This time, the anaerobic treatment was applied to evaporator drain, deinked pulp wastewater, and bleaching wastewater, with a pilot test plant. The result, high COD removal and high load were obtained in anaerobic treatment of the drain from evaporator though its drain contains inhibitory substances. On the other hand, gas recovery in case of deinked pulp wastewater is smaller than in evaporator drain, and COD removal is small in case of bleaching wastewater.

New IT Solution Transforms a Tacit into Visible Knowledge
- Text Mining Software REXION Pro -

Motomi Kohata
Advanced Automation Company, Yamatake Corporation

  This paper introduces Text Mining technology and describes the application of knowledge management for a manufacturing industry aiming at extracting know-hows and transforming an executable pattern.
  The algorithm of Text Mining software"REXION" simulates human recognition and processing of document classification (clustering) for bags of unmanaged documents so that large amount of document are automatically clustered.
  When various documents are analyzed/clustered with this software, it generates the information map which enables human can understand whole document space and executes correlation analysis between text and attribute/item those data are recorded in simultaneously.
  The above-mentioned feature is made the best use of, the maintenance record of the product, the contacting log at the call center, and the engineering documentation, etc. are analyzed, and useful knowledge can be obtained.

Study on Print Abrasion Trouble in Ink Layer of Matt Coated Paper

Takeshi Watanabe, Shigeo Yamanaka and Nobuhiro Matsuda
Polymer Research Laboratories, JSR Corporation

  Matt coated papers form a significant and increasing segment of coated paper sector because they fulfill the demand for a paper with high brightness, less glare and moderate gloss to get easy readability. Conventionally, matt coated papers have been produced by compromising between brightness, gloss and print abrasion. Especially, in matt applications, a high amount of ground calcium carbonate (GCC) gives good brightness, but relatively results in low print abrasion (also known as smudging or scuffing). The print abrasion which occurs during the bookbinding process or transportation process is critical problem for matt coated paper. Ideally, a matt coating system would produce a high brightness coating with good print abrasion. Optimization of particle size, particle shape of pigments, blends of pigments and varnishing are therefore used to try to reach a balance of properties and to eliminate this problem.
  In this paper, we considered that print abrasion was influenced by surface profile of coating layer; we study on the phenomenon, investigated clarification of the key factor of print abrasion trouble with using scanning white-light interferometer. In addition, this paper presents a new approach to matt coated paper design based on plastic pigment components. As a result, it was found that coated paper surface profile influenced to print abrasion; furthermore it was shown that the new pigment system could improve print abrasion without affecting matt coated paper performance like moderate gloss, resulting in a coarse blocky plastic pigment was used as a "spacer" to reduce print abrasion.

Keywords: matt coated paper, print abrasion, smudging, scuffing, surface profile, plastic pigment

How to Save Money, Increase Efficiency and Meet Regulations by Limiting Seal Water Usage

Ryosuke Baba
Mechanical Seal Engineering Dept., John Crane Japan, Inc.

  Water consumption not only represents a significant expense for pulp and paper mills and that alone is enough reason for them to look at ways to cut down its usage, but also is increasingly being recognized as a valuable natural resource and industry therefore finds itself under pressure to reduce its water consumption. Increasingly tight environmental regulations covering discharges and pollution are adding to the pressure to use less water and threaten major penalties for those who break them. Mill operators are increasingly being encouraged to question every incidence of water usage and to ask if their total consumption can be reduced. Yet they cannot afford to let this impact on their production or to degrade their levels of efficiency.
  Modern technology has created opportunities for water savings in some unlikely areas, prominent among which is the water used in mechanical seals.

For Sound or Noise in Industrial World Part II
-It Thinks about the Noise as Part of T.F.O from SKF-

Yasuhiko Yamasaki
Condition Monitoring Service division, SKF Japan

  When it explained last "For sound or noise in industrial world", the generation of the sound and the case were presented. It explains DGBB by centering as the part 2 this time and the mechanism of the movement and the case with the trouble are explanation. As for the damage of the bearing, it is necessary to think about actions to do at once by knowing at the first time and actions to make to the next overhaul. The sound in which the cause of needless environment deterioration is made can be decreased by executing it with the decrease of the energy loss of the machine.

Report of 2007 TAPPI Papermakers Conference

Koichi Yanai
Pulp and Paper Research Laboratory
Nippon Paper Industries Co., Ltd.

  The first joint 2007 TAPPI Papermakers Conference / PIMA International Leadership Conference was held in Jacksonville, FL., USA from March 12 to 15. There were 73 presentations in 3 sessions in TAPPI and 28 presentations in 3 sessions in PIMA. In this report some of the presentations in TAPPI Conference were reviewed.

A Report on PulPaper 2007
-June 5-7, 2007 at Helsinki, Finland-

Keihachiro Nakajima, Motoi Chiba and Yosuke Uchida
Oji Paper Co., Ltd.
Koji Okomori
Nippon Paper Industries Co., Ltd.
Kunitaka Toyofuku

  The PulPaper 2007 Conference & Exhibition was held in Helsinki, Finland on June 5-7, 2006 hosted by PI (Finnish Paper Engineersf Association). There were 48 special presentations on 8 sessions. Reflecting of spirit of innovation of PI and Finnish pulp & paper industry, there were 500 participants from many countries in the world.
Special mention is enormousness of the attached exhibition. In the area of more than 10,000m2, 500 exhibitions were performed. Before and after the meeting, we visited research organizations, paper mills, a felling spot, a tree-nursery in Sweden and Finland.

Application of Micro Bubble Treatment Technology to Paper-making Effluent Treatment

Yoshihiko Saijo and Makoto Iwasaki
Pulp and Paper Research Laboratory, Oji Paper Co., Ltd.

  It is said that a region of high temperature (thousands of ) and high pressure (thousands atmospheric pressure) rises, at the moment when a micro bubble disappears in liquor, and that microorganisms and chemical substance in liquor can be decomposed in the region. In this report, suitable conditions for generating most bubbles whose diameter are 50 micrometers or less underwater were found out using a micro bubble generator (revolution type) at first, and then they were applied to effluent treatment. Although SS decreased approximately by 60% by floatation with the micro bubble, the reduction of COD was not so remarkable. The reduction of COD is considered to be caused by reduction of SS and is not based on decomposition. As a result of applying ozone to micro bubble processing, COD decreased by 22% at the ozone concentration 125 g/m3, and the decrease was more than in case of conventional bubbles. COD in this case was measured after filtration. The cause of the not so large reduction (22%) of COD is thought that a region of high temperature and high pressure did not rise at the moment when a bubble disappeared.

Keywords: micro bubble, effluent treatment, reduction of COD, reduction of SS, ozone