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JAPAN TAPPI JOURNAL January 2009


Vol.63 No.1 Abstracts


The Latest Low Consistency Pulper Technology -IntensaPulperTR -
-Developing Story of the Innovative LC Pulper-

Naoyuki Iwashige
Stock Preparation Group, VOITH IHI Paper Technology Co., Ltd.

  The IntensaPulperTR, which was developed by VOITH IHI Paper Technology Co. (VPIT) and released 2006, is really innovative pulping machine with extraordinarily higher performance than the conventional low consistency pulpers and as result VPIT has received this yearfs honorable gSasaki Awardh of JAPAN TAPPI.
  In this paper, VPIT will show the development procedure of the IntensaPulper, that is, the research and development stage at the VPIT R&D center and the field trial with the commercial size of the proto type IntensaPulper at Oji Paperboard Co., Oita Mill.
  The other advantages which will be gained by applying the latest IntensaPulper technology will be also introduced.


Sludge Dewatering Machine, Rotary Press Filter
-Dewatering of Paper Making Waste Water Sludge-

Koji Matsumoto
Tomoe Engineering Co., Ltd.

  The sludge dewatering machine used in wastewater treatment is important equipment for volume reduction and solidification of sludge. The sludge dewatering machine is required to have higher dewatering capacity and be more energy saving and efficient to realize low-cost wastewater treatment. To meet these needs, Tomoe Engineering has introduced Rotary Press Filter from Fournier Industries Inc. of Canada, made improvements, and has been manufacturing and selling the equipment. Key features of Rotary Press Filter include high dewatering capacity, low power consumption, small footprint, small amount of washing water, easy odor control, and easy maintenance. In recognition of the achievement of these features, Rotary Press Filter wan the Sasaki Award. This paper introduces the treatment capacity and effect of introduction of Rotary Press Filter.


Development and Operating Experience of the Newest Kneader

Hideyuki Goto and Isao Aoki
Ishinomaki Mill, Nippon Paper Industries Co., Ltd.

  Nippon Paper Group, Inc. has prepared its gGroup Vision 2015h, which calls for becoming one of the top five pulp and paper company in the world, with a view to realizing stable and high revenues in our domestic businesses and a full-scale expansion of our businesses overseas over the next ten years. Then, we installed the N6 paper machine in the Ishinomaki Mill of Nippon Paper Industries Co., Ltd. as a first step of our vision, which is mainly producing a light-weight coated paper and an ultra light-weight coated paper, and started its operation in November, 2007.
  We also installed the new de-inking pulp plant which is called gHDIP-2h in order to supply high quality de-inking pulp to N6 paper machine. Regarding the installation of the HDIP-2, we designed its process to optimize the efficiency of deinking and reject system in relation to becoming poor quality of old paper in the near future. Especially, we have developed a newest @4-shafts kneader gUV-Breakerh with Aikawa Iron Works Co., Ltd. and installed it as a coarse kneader in the HDIP-2 process in order to manage any old papers with UV printing.
  In this report, we show our development and operating experience of the newest kneader.


Operating Experience of Formmaster

Nobuyuki Kido
Kasugai Mill, Oji Paper Co., Ltd.

  Oji Kasugai No.8 machine started up in 1962. The unit, which has a wire width of 5.81m and a design speed of 700m/min, produces 330t/d unbleached kraft paper for wrapping and taping.
  Recently, because of speeding up of processing machine at the customer and diversification of end products, higher quality is required increasingly, such as good runnability and sheet strength. To meet these demands, we installed high-speed shaking equipment gFormmasterh from Metso in January 2007. It enabled us to@enhance paper quality and to improve production .
  This paper will present the outline of gFormmasterh and our experiences in its operation.


Operating Experience of No.3 Incinerator

Tomoo Arano
Environmental Section, Niigata Mill, Hokuetsu Paper Mills, Ltd.

  In the fall of 2004, Niigata mill considered replacing the old sludge incinerator. As a result, we formed a project to build a new one that works not just as an incinerator but also as a biomass power boiler in order to reduce energy cost. It uses paper sludge, demolition wood and RPF (Refuse Paper and Plastic Fuel) as Fuel.
  At that time, the biomass power generation was being supported through a new energy promotion project sponsored by Agency for Natural Resources and Energy.
  The following year, the construction of new biomass power boiler began. And Niigata mill made a trial run of the boiler at the end of 2006. Now, wefll report some specific things we learned about new biomass boiler form its one year period of operation.


An Evaluation of Light Scattering Property in Printing Paper

Masayuki Takishiro, Yukio Kotori and Shinichi Inoue
Process Development Laboratory, Corporate Research Center, Mitsubishi Paper Mills Limited

  Light scattering phenomena in paper can be represented by the Modulation Transfer Function (MTF) of paper. In this paper, a new technique for measuring the MTF of paper is introduced. We have developed an experimental instrument for measuring the MTF of paper. It can project a sinusoidal test pattern on sample paper. The reflection intensity distribution of the projected sinusoidal test pattern is measured by the CCD camera. The MTFs of different type of printing paper were discussed.


Improvement of Pulpwood Productivity of Fast Grown Eucalyptus and Acacia Tree Species in Southeast Asia

Shinichi Sukeno
Forestry Research Institute, Research & Development Division, Oji Paper Co., Ltd.

  This paper explains the historical activities of the Forestry Research Institute of Oji Paper Co., Ltd. in improving pulpwood productivity of plantations in Lao PDR and Vietnam. Improvement of productivity in Vietnam has been attained by selecting and planting hybrid clones of Acacia mangium x A. auriculiformis. The clones were selected for good growth performance. Then, high wood density clones were selected from them. In Lao, Eucalyptus deglupta x E. camaldulensis showed the best performance in clonal trials and we have confirmed that it has satisfactory pulpwood quality. There is no pure Eucalypt species with satisfactory performance in Lao. Therefore future direction on Eucalypt breeding is in making inter-specific hybrids. We have collected and are field testing various Eucalypt genetic resources from which we are planning plus tree selections of pure species for the production of hybrids in the near future.


The Making of Paper Contributes to Local Environment
-Paper Made from Bamboo-

Masato Kawata
Pulping Section, Sendai Mill, Chuetsu Pulp & Paper Co., Ltd.

  Kagoshima Pref., where the Sendai Mill is located, has the largest bamboo forests area in Japan, and typical species named Moso bamboo covers an area of 7,600ha. Since well controlled bamboo forests produce a good quality of bamboo shoot, it is said that we need to eliminate bamboo older than five years every year. However the eliminated bamboo has been left in the forest usually. Kagoshima Pref. has been in the process of establishing an efficient system of recycling the eliminated bamboo, in order to maintain healthy bamboo forests and to contribute to producerfs profit.
  Sendai mill has focused on this local peculiarity and has begun production of paper made from bamboo pulp, from the global view points such as protection of environment, prevention of global warming.


Development of On-line Fiber Orientation Control
-Improvement of the Quality of Copy Paper-

Hidenori Yatomi, Michihiro Fujiyama and Yoshisada Yamabe
Yatsushiro Mill, Nippon Paper Industries Co., Ltd.
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. 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.


A Report on 2008 Engineering, Pulping, Environmental Conference and International Bioenergy and Bioproducts Conference
-August 24-29, 2008 in Portland, USA-

Shisei Goto, Reiko Oshima*1, Hiroyuki Nagatani*2, Hitoshi Okada*3 and Kunitaka Toyofuku*4
*1Nippon Paper Industries Co., Ltd.
*2Oji Paper Co., Ltd.
*3Japan Pulp & Paper Research Institute, Inc.
*4JAPAN TAPPI

  2008 Engineering, Pulping, Environmental Conference and International Bioenergy and Bioproducts Conference (24-29 August) were held for six days under the auspices of TAPPI in Portland, USA. Probably it is the first event for TAPPI to hold two conferences in succession. There were 98 presentations on EPE and 30 presentations on IBBC. Five persons including Mr. Toyofuku, as representative of JAPAN TAPPI, attended the conferences. Before and after the conferences, we visited, a felling spot of Weyerhaeuser and head office of TAPPI.