2005年8月 紙パ技協誌


NipcoFlex Calender

Eiji Ando
Application Engineering Dept. Voith IHI Paper Technology Co., Ltd.

 The product demands antithetic requirements: better surface quality and less loosing of its bulk. The shoe nip calendaring is one of convincing answer to the old question how a paper web can be calendered without loosing too much of its bulk. The NipcoFlex calendar, as the new shoe calendar called at Voith Paper, has been released and being carried out energetically to explore its capability. This calender mainly acts via the extended nip and associated longer dwell time.
 This description shows very brief overview of the huge collection of the trials, experience of 1st commercial product, and to demonstrate the potential for the NipcoFlex calendar.

Newspaper Mill Optimization of Flotation Cell

Bo-Johan Ljungqvist and Chiaki Benitani
Spectris Co., Ltd., BTG Division

 These presentations show what BTG can do in de-inking plants especially regarding “Optimization of flotation cell”.
 A de-inking plant consists of a combination of different stage, which essentially serve to separate unwanted material from the recovered paper and to enhance the quality of the fiber suspension. The number and nature of the stages in the process are determined by the fiber suspension requirements. These requirements come from the paper grade that will be produced and this will also determine the raw material mix.
 There is always a pulping stage designed to disintegrate the recovered paper. During this stage, with the help of the right chemicals, the printing ink can be detached from the fibers. After the pulper, various screening and cleaning stage follow. At these stage impurities such as bits of metal, glass, sand and adhesive impurities (“stickies”) are removed. The next step in the process is the flotation, where the actual de-inking is done. Finally we have the bleaching stages to boost the level of brightness and dispersion stages to further break down the printing inks in the fibers and to pulverize impurities that cannot be seen by the naked eye. There are also other sub-systems for treating rejects and sludge.

Operating Experience of Dirt Counter

Sadaharu Kunioka
Kushiro Mill, Oji Paper Co., Ltd.

 In Kushiro mill we are using the 7 sets of dirt counter. These equipment are helpful to find the abnormal condition at the process and we could reduce the number of sample checking by operators. I will report that the process of the installation and operation for the first one at DIP plant, and the operating experience at DIP and BKP plant.

Trouble-Free Operation™

Yasuhiko Yamasaki
Condition Monitoring Marketing Service Division, SKF Japan

 SKF offers a full range of products and services to assist customers in achieving maximum bearing and machinery service life, and is committed to providing optimum solutions for Trouble-Free Operation™ of plant machinery.

A Kvaerner Pulping Way to Improve the Environmental Operation of a Fiberline by Small Means

Martin Ragnar
R&D, Kvaerner Pulping AB
Tomoyuki Tezuka
Projects Department, Kvaerner Pulping KK

 When the environmental operation of a pulp mill is assessed much of the attention is usually paid to the bleach plant. This is appropriate. The development of bleaching technology has been very rapid over the past 25 years and more is to come. In order to keep up with the frontrunners of environmentally friendly bleaching continuous investments in the mill are required.
 The aim of this article is to give an overview of recent trends and to point out ways to improve the environmental operation of an old bleach plant having a limited budget.

Maintenance Management of a Drainage and Supply Pipe Way Institution
-Spiral Jet Washing of a Superannuated Drainage Pipe, a Hose Lining Method of Construction, etc.-

Toshiya Mochizuki and Satoru Ura
Toyobo Engineering Co., Ltd., Environment Solution Division

 There are many superannuated drainage and supply pipes, especially things on which carbonic acid calcium and oxalic acid calcium deposited the drainage pipe way of a papermill firmly, and the washing is serious. Spiral (using the water amount of 180 l/min by super-high pressure, and moving a jet nozzle spirally/wash efficiently and) A jet method of construction is introduced.
 Medicine washing of unnecessary neutralization processing is also united and proposed in the diameter of a small sum.
 Reproduction of a pipeline introduces a hose lining method of construction applicable from the diameter of a small sum to the diameter of a large quantity. A hose lining method of construction is without excavating, and is a method of construction from a manhole which carries out reversal insertion the seal hose which has tough and waterproofness into a pipe by air pressure. The seal hose is made to harden 2 liquid reaction type hardenability resin uniformly applied in, and forms a new pipe in the inside of a pipe.

Introduction of Various Rolls for Sheet Conveyance

Hiromine Mochizuki
Oji Engineering Co., Ltd., Kanzaki Branch

 The field which coats water or oil solvent onto a film and metal foil, etc., is required high precision coating in order to reduce the variation of coat weight in comparison with the field coat onto a paper.
 The products with which especially the variation of coat weight appears as a result as it is, for example, a photosensitive film, a film for medical treatments and surface treatment of metal foil, need high precision coating.
 The high precision coating needs the high performance coating head, the stability of a sheet thickness and the accurate cross tension, but these demands are not necessarily met.
 The torque of an unwinder part and the drive system of a winder part ordinarily set up sheet tension in a coating machine. Also it is known widely that rotation resistance of the non-driving rolls that are installed in order to convey a sheet has a great influence upon a sheet tension.
 The outline of several sorts of rolls that should cope with these problems is shown.

New Evolution of PAM Type Paper Strength Agents

Katsuhiro Shimamoto
Research and Development Department, Paper Chemicals Division
Arakawa Chemical Industries, Ltd.

 In recent circumstances of paper making industry, conventional polyacrylamide (PAM) type paper strength agents are tend to difficult to exhibit their inherent characteristics because of the change in operating conditions.
 This report shows our developed new PAM paper strength agents having sharp molecular weight distribution, which prepared by a new polymerization method, and their characteristics. This report further shows 2-liquid-combination system wherein two kinds of the new PAM agents having different flocculation characteristics are used.
 The above combination system has an object to keep well balance of freeness and formation by unifying the size of pulp flock, thereby improving paper strength efficiency.
 Each of the single liquid system and the 2-liquid-combination system shown in this report can be suitably selected in conformity with paper manufacturing purpose. Therefore, our proposed systems can provide superior results than those of conventional systems, in relation to flocking property, paper strength efficiency and formation.

The Latest Information of Polyvinylamine
- Fixing Agent Based on Polyvinylamine -

Anton Esser
Kazumasu Kobayashi
BASF Japan Ltd.
Satoshi Hiuga

 Hydrophobic substances like wood pitch, white pitch and stickys are introduced into the paper machine circuit by the raw materials used. To minimise runnability problems related to these substances, treatment with cationic fixing agents is common.
 An entire class of new polymers, the polyvinylamines, has been developed. These new polymers have a large potential to improve the treatment of hydrophobic substances. The bonding strength between fibres and particles and therefore the fixing performance of polyvinyamines can be controlled by a wide choice of molecular weights, cationic charge densities and hydrophobic functional groups.
 The effectiveness of polyvinylamine based fixing agents having different charge densities and different degrees of hydrophobicity, is demonstrated by the results generated in different lab studies and mill trials.


Joe Ledda, Philip A Ford, Ryuta Miyazaki and Masashi Hasegawa
Business Line Paper, Water and Paper Treatment Segment, Ciba Specialty Chemicals Co., Ltd.

 Microparticle and micropolymer retention and drainage aid systems are powerful tools for paper and board making on a wide variety of machines. Deficiencies attributed to current systems can include apparent high cost, production and quality problems, and negative effect on formation, or in other words, the negative effective on printing qualities of the final sheet.
 The next generation of multi-component organic/inorganic systems has demonstrated their ability to improve formation for the same retention level, or increased retention, with either no negative effect on formation, or in some instances, even improved formation! They offer the ability to dial in retention/drainage/formation with the same high return on investment of current microparticle systems.

Modern Technology for In-line Measurements in P & P Industry
- Conductivity, Dissolved Oxygen, Turbidity and Oxidation-Reduction Potential -

Yasuo Watanabe
Mettler Toledo K.K., Ingold Group

 At the last Annual Meeting in Hiroshima, we introduced the modern technology for pH measurement in Pulp & Paper Industry. However, there are other important parameters, not only pH, but also Conductivity, Dissolved Oxygen, Turbidity and ORP. These parameters are available for in-line measurements in P&P Industry. So we would like to introduce some examples of application regarding these parameters.

Pest Control in Pulp and Paper Industry
- Pest Control Activities for Quality Assurance -

Yoshihiro Kuroda
Research and Development, Earth Environmental Service Co.

 There are 5 important activities for inset pest control (prevention of insect contamination) in terms of quality assurance in pulp and paper factories as follows;
1) Analysis of claim from customers caused by contamination of insects as well as detection of contamination in the factory. It is important that they should identify the kinds of insects (=contaminants), date and time of contamination, and contaminated location of processing line. Results should also be recorded, collected and kept.
2) Investigation of successive data of each kind of contaminants captured by traps in the factory. It is important that they should summarize the profiles of each contaminants in the documented form i.e., insect pest library.
3) Establishment of integrated preventive procedures by correlation study of cause and process of contamination by insects. Information about ecology and behavior of each contaminants is convenient to decision of effective procedures.
4) Collecting environmental parameters indicating strength of light, direction and velocity of air flow, temperature, humidity for all monitoring points as well as the number of contaminants captured.
5) Periodical audit and validation of activities. It is important that they should refine and correct activities by periodical education and training of employees.

Repulpable Tape for Paper Mill
- Repulpablity of Tapes -

Yukitoshi Horikawa

 Repulpable tapes are used for many applications at paper mills. The most important property of these tapes must be “repulpability”. Repulpability is unique requirement for these applications. It is not easy to give repulpability to pressure sensitive adhesives because many other requirements for these tapes (such as shear resistance, heat resistance and anti-bleeding) become trade-off to repulpability. So we have to harmonize repulpablity with other properties in developing repulpable tapes.
 In this presentation, I will show requirements for repulpable tapes, the relations between “repulpability” and other properties and a test method of “repulpability”.