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JAPAN TAPPI JOURNAL Vol.62 No.1


January 2008  Abstracts


Development of Ceramic Blade with Sensor and the Effect of Spectra Foil Sensor System for Paper Making

Takeshi Shirao
Strategic Planning Dept., Technology Div., Oji Paper Co., Ltd.
Kenji Yamauchi
Sales Engineering Dept., Horikawa Engineering Works Ltd.
Satoshi Nakamura
HPS, Asia Pacific, Pulp & Paper Marketing, Honeywell Japan Inc.

  SpectraFoil System was introduced to the paper industry in the late 1990s. SpectraFoil is a unique technology, able to measure the drainage rate on-line in the wire part of a paper machine.
  Japanese paper manufacturers assessed the original technology, however they were concerned with the potential of sensor wear and possible damage the forming fabrics.
  The original sensor from Honeywell consisted of a polymer sensor housing with a stainless steel electrode. Honeywell Japan, Horikawa Engineering and Oji Paper developed a new sensor using special material as conductive ceramics, gCermeth and it can be build into a ceramic foil blade. This foil blade can be replaced one foil blade of gCeraserth. With this design change, SpectraFoil achieved the original design concept combined with reliable performance. Oji Paper has installed SpectraFoil Systems on 8 paper machines recognizing great economic benefits from reduction of sheet breaks and energy savings.


The Current Technology of Ink Marking System for Sheeter

Kazuo Matsuura
Hokuetsu Kamiseisen Co., Ltd.
Seiichi Hayashi
Electronic & Instrument Department, HOKUETSU ENGINEERING Co., Ltd.
Masayoshi Hasegawa
Corporate Planning DepartmentCDAITO INDUSTORY Co., Ltd.

  There are two types of ream marking system during sheet cutting process: One is paper strip marker (ticket inserter), and another is ink marker. Normally, ticket inserter is common in Japanese finishing process because inserting equipment is simple and accurate. On the other hand, ink marking controlling is difficult because the marking has to be done before cross cutting and a marking location on the slitting edge changes by the line speed of sheeter. Hokuetsu Kamiseisen mainly adopted gInkmarkerh and has been developed for many years. The disadvantages of marking with ink are solved by improving control method that is followed by developed component devices, and nowadays many cutting operators regard Inkmarker as the most reliable equipment. Inkmarker is installed not only Hokuetsu Kamiseisen sheeters but also other paper finishers and evaluation from them are extremely high. This report describes the overview of Inkmarker system and the operating experience.


The Operating Experience of PM7 after the Rebuild at Ishinomaki Mill

Yuji Nakagawa
Ishinomaki Mill, Nippon Paper Industries Co., Ltd.

  Ishinomaki mill locates east part of Miyagi Prefecture, adjacent to the Kitakami River. The mill produces approximately nine hundred seventy thousand-ton of papers annually and has three coaters, ten paper machines including No7 paper machine, which is introduced in this paper. No7 paper machine started in 1960 producing a newsprint paper and then converted to the coat based paper machine in 1981. The paper machine is rebuilt to improve the paper quality in 2006.
  This paper reports the facility and effect from the rebuild.


The Experience of Fiberline Plant Operation

Fumiaki Kimura
Ohe Mill, Marusumi Paper Co., Ltd.

  Marusumi Paper New Fiberline Project was completed in May 2007. Because of renewing our old fashioned KP plant at Kawanoe Mill, New Fiberline was constructed at Ohe mill.
  The fiberline with 700t/d of hardwood bleached plant construction includes Recausticizing Plant with lime Kiln, Recovery Boiler, Bleaching chemical preparation plant, Chip handling and Pulp Sheet Machine. And also New Systems are introduced for this project such as Turbo-Feed system, Ozone base ECF Bleaching system.
  New Fiberline shows good performance for pulp bleaching, energy saving and decreasing the level of environment load.


The Study on Deinking of Old Newspaper

Hiroyuki Nagatani
Pulp and Paper Research Laboratory, Oji Paper Co., Ltd.

  The difficulty of Old Newspaper deinking is not the same. The relationship between the quality of old newspaper and the difficulty of deinking was investigated. Our study shows that the difficulty of deinking depends on the type of the papermaking chemicals. In addition, the degree of ink-penetration into paper influences on the deinking property.
  Our new generation newspaper "Plus News" consists of new technologies which keep ink on the surface of the paper. So it gives extreme printing quality, and much better deinking property. It is important that paper-manufacturing companies should consider not only the quality of products, but also the deinking property regarding product recycling.


Operating Experience of High Speed Refiner

Keisuke Irikawa
Iwanuma Mill, Nippon Paper Industries Co., Ltd.
Mitsuhiro Sugino
Technical & Engineering Div., Nippon Paper Industries Co., Ltd.

  Nippon Paper Industries Iwanuma Mill produces Refiner Groundwood Pulp (RGP) as mechanical pulp for High-quality newsprint, which is one of our companyfs strategic products. RGP process consumes much energy compared to DIP or KP process. The energy consumption of RGP is equivalent to 10% of energy used in whole mill. The energy is supplied by millfs own boilers and turbines. Since one of the boilers is heavy oil boiler, recent steep rise of oil price made a serious impact on RGP production cost. Under these circumstances we introduced High-speed refiner made by Andritz K.K., for the first time in Japan to reduce primary refining energy consumption. This High-speed refiner had been already introduced to several TMP process (RTSTM) outside Japan and they are successful in saving energy. However, there was no precedent installation in Japan, no knowledge about resulting RGP properties were available. Therefore pilot scale trial at Andritz K.K. pilot plant was conducted. The result showed that saving energy while maintaining pulp properties were possible. According to these results we decided to introduce this refiner. The installed High-speed refiner is single disk refiner, which has distinctive rotational speed of 2,150rpm. Specific energy was reduced from 1,200kWh/t to 680kWh/t with same pulp properties.
  This report shows operation experience of High-speed refiner in saving energy of RGP process compared to former refiner.


Operating Experience of High-consistency Ozone Bleaching

Ai Van Tran and Shuji Morita
Mishima Mill, Daio Paper Corporation

  The bleach plant of kraft pulp at Mishima mill is composed of three lines. One multistage line has been producing ECF bleached softwood kraft pulp (NBKP) using chlorine dioxide from April 2004. The other two bleaching lines produce bleached hardwood kraft pulp (LBKP) and encompass one displacement tower and one multistage line. Whereas the former was practicing chlorine bleaching up until early March 2007 when it started high-consistency ozone-based ECF bleaching, the latter was already making chlorine dioxide-based ECF-LBKP in April 2004 and has been converting to high-consistency ozone bleaching since April this year. Thus, all the kraft pulps at our Mishima mill are now completely and fully ECF bleached. Compared to the chlorine-bleached pulp, the breaking length and burst factor of the ozone-bleached LBKP are somewhat lower but the tear factor is almost equal. The COD, color and chloroform loads of the bleach plantfs raw effluents are decreased considerably. The AOX and color loads of the treated mill effluent discharged into surrounding receiving water bodies are also reduced, but to a smaller extent.


A Paper on Use of a New Energy Boiler

Shingo Obata
Takaoka Mill (Futatsuka), Chuetsu Pulp and Paper Co., Ltd.

  Takaoka Mill (Futatsuka) in Toyama Takaoka is one of main factory of Chuetsu Pulp and Paper along the west side of Sho River which is always full of beautiful clean water, and products papers for news papers and publication papers. Electric power is supplied by two sets of power plants with purchased from the grid.
  At the same time of replacement one boiler because of its lifetime, New boiler was planned to use renewable energy such as waste tire derived fuels (TDF) with radial wires and the biomass (demolition wood) as main fuels with considerations of Global warming (CO2 reduction) and operational cost reduction. The first ignition of new boiler was in June 2006, and started in operation in November 2006.
  The features and operation experience of new boiler are reported here.


Boiler Fuel Conversion by Installation of LNG Satellite Facilities

Tadashi Arifuku
Tonegawa Mill, Rengo Co., Ltd.

  In line with increasing social demands on environmental conservation, Rengo has established Eco Challenge 009, a document setting forth our environmental vision, and is implementing resource and energy savings activities.
As part of our efforts, Rengo targets to achieve 12% reduction of CO2 emissions from the 1990 level by 2009.
  This paper will introduce LNG satellite facility installed at Rengo, Tonegawa Division as an example of boiler fuel conversion from Bunker C to LNG.? The effect of fuel conversion, such as reduction of CO2 emissions, will also be examined.


Operating Experience of New System Sheeter

Takumi Akasaka
Hachinohe Shigyo Co., Ltd.

  We are Hachinohe Shigyo in where located Mitsubishi Paper Hachinohe mill. There are about 550 employees and we are handling paper products with 75,000 (T/Month) by supercalender, winder, cutter and wrapper. Besides above, we carry out upon the delivery job in the mill.
  The name of this time cutter is 35 cutter that is developed by E.C.H.WILL GmbH in Germany. This machine has the latest technology and might be the top level in the market as the output capacity and also the sheeting quality side. We are starting to make the sellable products from September in 2006 and then output are increasing, we achieved the target output in this March.
  I want to speech about this new cutter feature and operating experience.