2012 September JAPAN TAPPI JOURNAL
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2012 September JAPAN TAPPI JOURNAL

Vol.66, No.9 Abstracts


Latest Technology for Curtain Coating

Toshihiro Katano
Voith IHI Paper Technology Co., Ltd.

  Curtain coating has been applied particularly to specialty paper, namely thermal paper, non carbon paper, information paper and so on. Nowadays, for further utilization of DF coater, Voith IHI has been developing it from two aspect; color and machinery. For example, until recently, it was the main stream to replace an air knife or a rod coater by a DF coater for specialty paper. However, now, Voith IHI is aiming to install a DF coater as an alternative coater for pigment coating.
  Referring to this movement, this thesis will introduce an approach to the new area of DF board paper and its prospects.


Operation Experience of PM N9 with On-machine Coating

Junya Hosotsubo
No.7 Production Department, Niigata Mill, Hokuetsu Kishu Paper Co., Ltd.

  Niigata N9 paper machine  which has wide width and high speed has begun commercial operation from September 1st, 2008. N9 has overcome many difficulty, achieved 1,600 m/min operation, and produced over 1,100t a day for three and half years passes from commercial operation. The coating section of N9 which took over various operation experiences from Niigata N6, N7 and N8 machine has equipments that correspond to wider width and higher speed, has been operated smoothly without any big problems so far.
  In this report, it introduces the outline of coating section equipment and the operation experience of coating section (Sizer and Blade Coater).


Blade Coating Technology
- Basic Theory of Blade Coating and Blade Design -

Seiichi Anzai
BTG Division, Spectris Co., Ltd.

  Recently, a new coater machines has been built up as wider and faster one in the world wide, and such wider and faster machines has been already operated at Pulp & Paper fields in Japan, as well. Furthermore some of existing domestic coater machines has been modified as faster one for improving about its productivity. Even under such wider and faster operating conditions, there is always a requirement in Japan that the coated paper quality of paper product has to keep higher quality level. On the other hand, raw materials for making coated paper has been changing nowadays due to economical reasons, and generally it makes more difficult conditions to keep such higher quality level.
  A coating blade directly takes an important function for realizing about such stable productivity and high coated paper quality at the coating operation, so we have to provide properly designed coating blade which has appropriate functional material to meet the customerfs requirement.
  This article explains about a basic theory of blade coating technology and a key issue for selecting proper blade design, and introduces to unique characteristic blade among our products, the SOFT TIP BLADE (DB-ST) type.


The Latest Rubber Cover|Backing Roll for Blade Coater

Hiromitsu Aoyama
Seibu Polymer Corporation

  In recent years, a large number of paper making machines laying emphasis on coated paper were introduced into the market. Those machines are all on-machine coater with high speed and wide width, and they are aiming at strengthen its cost competitive position, by switching from gwide varieties-small quantity productionh to gsmall varieties-large quantity productionh.
  Today, we would like to explain the details of development, the special features and evaluation on cover materials for backing roll installed on the latest coating machines.


Operating Experience of PM N1 with On-Machine Coating

Akihiko Yamamoto
Oji Paper Co.,Ltd.

  PM N1 in Tomioka mill started the trial operation from November 2008 and has produced commercial paper since February 2009. We successfully achieved the continuous operation at 1,700mpm by now. At present, we are mainly producing ultra-coated paper with improving qualities. In addition, we are making an effort to improve productivities and cut production costs.
  This report presents the outline of facilities, operation troubles we have experienced and the countermeasures at the coating section of PM N1.


E-Book and Digital Reading
|Paper Media and Digital Media|

Yashio Uemura
Senshu University
Hiroyuki Yaguchi
Tokyo Denki University

  There are evidences of the decline by grade and end-use in the publication paper market. People prefer reading comic books on mobile phones. Sales of electronic dictionary have exceeded that of paper dictionary. Printed maps have been replaced with car navigations. Commuters depend on application software downloaded on mobile phones rather than on printed train schedules. Information magazines full of new movies and restaurants are impacted by internet. E-book reader is an exception. The size of the electronic book reader market does not grow at the rates experienced by other digital devices. The book serves many needs including education, information and leisure. Paper books have provided an easy-to-use, cost-effective, transportable medium that fulfills these end user needs.


Screen Baskets Utilizing Laminar Design Wedge Wire Technology

Morio Kuramochi
Metso Paper Japan Co., Ltd.
Jukka Virtanen
Metso Paper Oy

  Using computer modeling has enabled Metso to develop a new Laminar Design Wire for screen baskets. The new wire shape optimizes flow at the screen boundary layer and reduces flow resistance through the slots, lessening thickening and thereby the load exerted on the screen. The decreased accept channel backflow leads to decreased pressure drop over the screen basket, especially at higher slot velocities. The result is much higher capacity accompanied by high efficiency. The laminar flow pattern after the slot not only ensures outstanding run ability without fiber blockage or stringing problems, it also contributes to a longer basket life.


Cleaning Device of Paper Making Machine Tools, POM/Wet End System, White Water Treatment Technology

Yoichiro Iwatani
Technical & Sales Dept., AIKAWA IRON WORKS CO., LTD.

  In the quality improvement of the product and reduction in costs, it is important to wash the Paper making machine tools appropriately. And cleaning equipment is making progress more than before. Here we would introduce the feature of these cleaning equipments and the merit by the introduction.
  And by Simplification of Wet End System, significant merits can be achieved in paper making process like stability, fast response during paper grade change, saving energy and reducing rate of discharged stock with small initial cost.


Space-Saving Web Inspection System that Used Sensor Fusion

Kazuaki Watanabe
Inspection Systems Business Div., Omron Corporation

  As for the inspection of the quality paper such as coated papers, there are a lot of needs of two or more inspection policies of the inspection of a multi frame etc. The installation space might not be able to be secured because there are a lot of numbers of installations of the camera and source of light frame. Then, the inspection more than three frames was achieved by the number of space cameras of two frames this time, and "Super-NASP-SF" was put on the market. It introduces the technology that takes it by "Super-NASP-SF" in this text.


Some Examples on Abrasion- and Corrosion- Resistant Cladding for Boiler Panel

Taketoshi Goto and Hiroaki Fukumoto
Welding Alloys Japan Ltd.

  Since 2004, crude oil prices are stable in high range, and the accidents at Fukushima No. 1 nuclear power plants forces government to rethink its traditional policy of promoting nuclear power generation. These changes of surrounding situations make importance of power generations with biomass boiler increase.
  However, the problem due to corrosion and the wear that occurs in biomass boilers and the auxiliary equipment cause the decline in the operation rate and the extra cost. Welding Alloys Japan is trying to produce anti-corrosion and wear-preventing method for the biomass boiler based on our essential technology. Here we introduce our experience though some cases.


Application of the Optical Caliper Sensor to a White Coated Board Machine

Hirofumi Shimizu
Fuji Mill, Oji Paperboard Co., Ltd.

  Oji Paperboard, Fuji Mill N2 machine has produced white coated board since October 2001.
  We had the problem with the streaks and sheet breaks by conventional contacting calipaer sensor. Recently, QCS makers have released the online paper thickness measuring equipment which is applied the optical principle to. Then we installed the optical caliper sensor which is produced by Yokogawa Electric Corp. in N2 for the purpose of reducing the streaks and sheet breaks.


Manufacturing Facility Corresponding to Speed Up and Upsizing of Paper Machine

Masaki Tsuji and Shinichi Iwami
Production Technology Section, Nomura Plating Co., Ltd.

  In late years speedup and upsizing of the paper machine are pushed forward for reasons of the production efficiency or the improvement of the international competitiveness in the paper industry.
  With upsizing of the paper machine, the rollers installed there become larger and longer in size.
  We hold the manufacturing facility corresponding to the large-sized roller ahead of the roller makers and came in response to the needs of the paper industry with the start-to-finish production of the roller from a design of roller to various surface treatment on it.
  Now the roller of 4 meters in its diameter and 12 meters in its length is able to be manufactured.
  In addition, we continue installing of various new facilities and developing the new technique in order to cope with further speedup and customer needs.
  Our manufacturing facility and technique corresponding to the large and long rollers are shown in the following papers.


Identification of Filamentous Fungi in Paper Damaged by Tsunami of the Great East Japan Earthquake

Kenta Higashijima, Tomoko Wada, Kiyohiko Igarashi,
Toshiharu Enomae, Masahiro Samejima
and Akira Isogai
Graduate School of Agricultural and Life Sciences,
The University of Tokyo

  We are developing a new easy-to-use method for rescuing flood-damaged paper by using salt water.
  In this study, filamentous fungi in paper damaged by tsunami of the Great East Japan Earthquake were identified by the method which can detect sensitively filamentous fungi in a small sample and the results were discussed for practical use of the salt water method. No filamentous fungi were detected in tsunami-damaged paper without mud sampled in paper products storage in the Ishinomaki mill of Nippon Paper Industries Co., Ltd., but Penicillium fungi were mainly detected in paper undamaged by tsunami sampled in the same place. This suggests that the effect of salt water on the inhibition of fungal growth for osmotic pressure would appear after paper was wetted by tsunami until it dried.
  On the other hand, various filamentous fungi were detected in tsunami-damaged paper with mud sampled in the same place. Tsunami-damaged paper with mud was likely to bring about fungal growth at high relative humidity, probably because numerous bacteria and fungi live in mud that is very rich in nutrition. This result shows mud on flood-damaged paper must be washed away with salt water or fresh water to remove fungi and nutrition. Alternaria fungi were mainly detected in paper damaged by tsunami and left for about 3 months outside the Hachinohe mill of Mitsubishi Paper Mills Limited. The salt amount in tsunami-damaged paper left outside was considered to decrease because the salt was removed by rain and dew condensation. So, the effect of salt water on preventing fungal growth was lost and fungi such as Alternaria fungi grew on tsunami-damaged paper left outside. This result shows that the decrease in the salt concentration must be avoided during the emergency conservation of flood-damaged paper with salt water.