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2009 February JAPAN TAPPI JOURNAL


Vol.63 No.2 Abstracts


OptiFeed Family
-To Improve Quality, Performance and Efficiency on Paper Machines-

Leif Piippola
Metso Paper Inc.
Hidehiko Yamazaki
Metso Paper Japan Co., Ltd.

  A modern stock preparation system strives toward good end product quality, improved papermaking line runnability and efficiency, both in terms of production and energy.
  Wet end chemistry strongly influences the production efficiency and profitability of paper and board making, and thus represents a considerable part of operating costs. Stability forms the basis for quality and runnability while flexibility contributes the most to efficiency. The best solution cannot only be found through sub-process optimization but through sufficiently broad process integration.
  The majority of stock preparation and approach systems are still based on conventional technology where large volumes, log delays and instability problems prevail. But these systems have some major drawbacks, such as the uncontrollability of separate dead volumes in tanks. Immediate problems with these systems include instability, such as consistency variations, stock and filler proportioning and the extended time required for grade changes.
  OptiFeed is a streamlined, single platform concept where automation and process design complement each other. The idea is to make stock processing stable and flexible, thus enabling improved production line quality and efficiency compared to conventional wet end management systems. Well engineered components and optimally dimensioned process-not too big, not too small-saves energy and prevents consistency deviations as well as pulsation. The OptiFeed system integrates separate key elements of the mill area in a unified high-efficiency concept, applicable to the entire stock preparation system or to approach flow system alone or components within it.
  This paper will present the implementation and benefits of the OptiFeed system in approach flow system management. The focus will be on deaeration and mixing processes, and automation solutions.


New Chemical Mixing Method after Machine Screen with TrumpJetTM System

Jouni Matula
WETEND Technologies Ltd.
Akira Ejima
Matsubo Corporation

  A new innovation, developed TrumpJet Technology is used to inject papermaking chemicals efficiently into headbox stock. The mixing is greatly improved and consumption of chemical is reduced. The injection liquid is circulated headbox stock or white water instead of fresh water. Several installations operate with good results and improved quality of production.


Cost Saving Case Study by Installing New TrumpJetTM Chemicals Mixing System

Ryohei Watanabe
Hachinohe Mill, Mitsubishi Paper Mills Limited

  We have tackled eOptimization of wet-endf at No.7 paper machine (7PM) in Hachinohe mill since 2005 spring. In this paper, we introduced the cost saving case study of a 35% reduction in retention aids and expanding wire and felt lives by the improvement in retention by installing New TrumpjetTM chemicals mixing system to a retention aid. Additionally other new installed plan was also described.


The Recent Technology for Elimination of Pitch Trouble by Using the Organic Polymer Coagulants

Hidetoshi Sakamoto and Kenji Sakai
Shonan Research Center, HYMO Corporation

  In this report, we introduce the recent methods of our pitch analysis: gmicro-pitch image analyzer systemh and gstickies image analyzer systemh, and the recent investigation of the use of Cationic Polymer Coagulants.
  Cationic Polymer Coagulants prevent growth of the micro-pitch and fix them onto pulp fibers.
  We found some of the coagulants have an ability to decrease adhesive property from the surface of the micro stickies particle or large size stickies.
The coagulants showed different characteristics in adsorption onto the micro-stickies particles, and the most effective coagulant should be selected depend on addition point in paper making process.


Operating Experience of Stock Preparation for Paperboard Making

Tomoki Nariyasu
Soka Mill, Nippon Daishowa Paperboard Co., Ltd.

  In a recent global environmental protection tendency, the energy-savings are one of the most effective subjects, which simultaneously can reduce cost under the extraordinary oil price increase circumstances.
  In the board mill, pulpers and refiners are known as high energy consuming equipments in the recycled pulping and the stock preparation process. This paper describes our recent operation experiences of high efficiency refiners replaced which successfully reduced power consumption in the stock preparation process.


Operating Experience of Mishima PM N10

Toru Hioki
Mishima Mill, Daio Paper Corporation

  8 percent of the coated paper demand in Japan is cost competitive paper which is produced with the latest production lines in China and Europe. And, Japanese LWC market is shifting to lighter weight products. We have built our N10 paper machine at Mishima Mill in order to have advantages in quality and cost against imported paper, and to meet the demand for lighter weight paper. N10 machine has both blade coater and roll coater to switch the coating process depending on paper grade. And it also has on-line multi-nip calender. It is the first on-line blade coater for us.
  We had some troubles caused by many interlocks for automatic systems. However, we didn't have serious operation or mechanical troubles which we had worried about, such as threading and start coating at coating section at high speed, gloss appearance with multi-nip calendar, and roll damage at online multi-nip calender. Now it runs very well.
  Since N10 machine is a new type of machine which has gapformer with forming suction roll, press section equipped with transfer belt, we had been worried about sheet formation and two-sideness. We have got planned quality of paper. And we have produced LWC which has enough stiffness we planned, by coating at roll coater after starch is coated at size press section.


Operating Experience of Ishinomaki PM N6

Hironori Asano
Ishinomaki Mill, Nippon Paper Industries Co., Ltd.

  PM N6 in Ishinomaki Mill has been in operation since November 1, 2007, and it is mainly producing MWC and LWC at 1600m/min speed. The wire width and designed speed of PM N6 is similar to PM N2 in Yatsushiro Mill. On-line blade coating station and hot soft nip calender are equipped in PM N6, which are similar to PM 9 in Iwakuni Mill. The production ability of PM N6 is 1.5 times higher than PM 9. It is designed for pursuing high productivity and cost competitiveness with various latest technologies. We achieved successful start-up by our cultivated technical knowledge and experience of on-line coat machine and the most advanced technology such as tandem-type 2-stacks shoe press, 6-stacks HSNC.
  This paper reports the outline and the latest operation experience of PM N6.


Startup Progress Report of Niigata New N9 Paper Machine

Akihiro Ogawa
No. 7 Production Department, Niigata Mill, Hokuetsu Paper Mills, Ltd.

  Focus on to the Wide width, High speed and Specialized in A3 grade production, N9 Paper Machine which 4th Oncoater machine in Hokuetsu Niigata mill has been successfully progressed from Stock on Wire at the beginning of June 2008 to On Reel, Color coating, Gloss Calendering and Rewindering. The quality identification and the print test for commercialization have been done at any time, the improvement and the stabilization of a quality have been tried on the basis of the customer evaluation. Through N9 operation, the development of the efficient production system including existing three Oncoater-machines has been convinced. In this paper, we introduce the point of machine selection, the effect of introduction of new equipment and the trouble cases etc.


Construction of Oji Paper TOMIOKA N-1

Kotaro Shinoda
Technology Div., Oji Paper Co., Ltd.

  TOMIOKA N-1 is the all online paper machine which has on-machine coater and on-machine calendar. This is under construction now in Oji Paper Tomioka mill. Our purpose of this innovation is to increase productivity of WFC which has growth market and to lead other competitors globally. Oji Paper Tomioka mill was selected for the construction site, because it has many old machines and has some merits such as variety of pulp, low cost of energy, and logistics matters.
  On adoption of all online machines, there are many challenges such as sheet break at blade coater, calendar roll damage with color defects and vibration in high speed calendaring. In order to solve these problems, TOMIOKA N-1 has been designed with the all new concept and latest technology.
  This paper will present the outline of TOMIOKA N-1 especially the process of introduce this machine and the concept of new design. In addition, some troubles about construction work and latest progress on the site will be shown.


Enhanced Paper Quality and Productivity Thanks to ModulePro, Innovative Moisture Apply System

Hideomi Uchikawa
Voith IHI Paper Technology Co., Ltd.

  When we discuss the quality of the paper, there are key parameters. The parameter about the moisture is important, and there is a great deal of the case caused by moisture in the paper when problems occur in production.
  It is thought that the outstanding matters on the moisture measurement technology were almost solved if we watch it macroscopically because high performance moisture sensor resisting harsh environment was developed by the present.
  But when we try to do automatic moisture control and absolutely need reliable moisture apply system as an actuator which is a device for letting paper to be absorbed from a large quantity of water to small quantity precisely.
  Voith Paper wanted to solve this issue immediately as a total paper making process supplier, and tried to find a solution using various conventional moisture apply systems. However a result to be satisfied with was not provided. Therefore Voith Paper did the test repeatedly at his own high speed paper machine in Heidenheim using a trial moisture apply system developed by Voith Paper for searching true mechanism of the water absorption into paper. Based on the result Voith Paper has developed innovative moisture apply system, ModulePro.
  By this report I introduce summary of ModulePro and application report on an anti-curl measures, improvement of calendering, moisture profiling results etc.


A Participation Report of the 2008 Marcus Wallenberg Prize Ceremony

Hideki Fujiwara
Nippon Paper-Pak Co., Ltd.

  The 2008 Marcus Wallenberg Prize Ceremony was held on October 6 in Stockholm, Sweden. First, I would like people of pulp & paper industry in Japan to recognize the significance of the prize through the background, as well as the great ceremony. Secondary, I would like to encourage researchers in the Japan and Asia region to nominate because I am invited one of ambassadors to the Marcus Wallenberg Prize Selection Committee.


New Automatic Control System for Fiber Orientation and Improvement of the Quality of Copy Paper

Junji Yamamoto, Hidenobu Todoroki, Katsumasa Ono and Takashi Ochi
Pulp and Paper Research Laboratory, Nippon Paper Industries Co., Ltd.
Takashi Sasaki and Hirofumi Sano
P&W Solution Dept., Yokogawa Electric Corporation

  A new automatic control system for fiber orientation has been developed. In this system, the fiber orientation on both paper surfaces is measured continuously, and the edge flow valves and the slice lip actuators at the headbox are manipulated automatically to minimize the differences of orientation angles between the felt and wire sides of paper. And the system can also estimate the change in the basis weight profile caused by the change of the slice lip shape, and manipulate the dilution control valves at the headbox to compensate the disturbance.
  We confirmed the validity and stability of the system on the actual paper machine. By this automatic control system, the average degree of twist-curl of paper is able to be reduced to less than half before and it is possible to produce copy paper with low degree of twist-curl continuously. Moreover, this system is quite efficient to shorten the time needed for adjusting the machine conditions to have enough quality for the copy grades after the startup of paper machines. This system has been installed in an actual paper machine and has been effectively controlling the twist-curl of copy paper since the beginning of 2007.

Keywords: automatic control system, fiber orientation, headbox, copy paper, twist-curl