Vol.66, No.5 Abstracts

Energy Conservation Effect by Grubbens Pulper of Cellwood Machinery AB

Daisuke Inoue
Itochu Machine Technos Corporation

  Rebuilding existing pulper with Cellwood Grubbens rotor is considered as an effective approach of conserving energy. More than 2,500 of Grubbens Pulper have been installed for over 50 years worldwide and it has been continuously developed to meet particular market needs including pulping wet-strength paper qualities.
  The project related to rebuilding of existing pulpers comprises 30-40% of overall project. These existing pulpers are rebuilt primarily due to the need for higher capacity or for breaking up of tougher material. Some rebuilds are done to reduce high maintenance costs of equipment.
  In order to break up tough paper qualities efficiently, it is essential to provide effective circulation even at high consistency and generate friction in the pulp flow. Grubbens rotor unit enables to generate a specific turbulence at high consistency due to its design, so it can increase the operating consistency in pulper tub. It ensures to achieve energy saving by 30-50% comparing to the conventional pulper.   This paper introduces the energy saving effect of rebuilding existing pulper with Cellwood Grubbens rotor.

Energy Saving by Upgrading DDR Refiner@|Result from Splined Upgrade Technology|

Junichi Yano
Sales Department, Kawanoe Zoki Co., Ltd.

  GL&V/Kawanoe Zoki has successfully completed the first existing DDR refinerfs upgrading project for energy saving by the spline technology at a mill of one of the biggest leading paper company in Japan on this February. At present the rebuilt refiner is being operated achieving 12% energy saving compared to the condition before upgraded. In a short while of it second upgrading project the same as the first one was placed an order from the same mill to us. Startup of it is scheduled for this August. It can be expected that the next DDR refiner is successfully started up around the time this book is published. Until today the installation of the existing DDR upgraded project for energy saving by the GL&V spline technology is more than 700 in the world. Multi-disc refiner technology developed by former Beloit corp. in 1980fs is the origin of the splined DDR refiner, this means that the GL&V spline technology has already more than 30 years of experience.
  Refiner itself consumes quite a lot of energy among pulp and paper production process. Therefore 10 to 15% energy saving at refiner bring in huge profit to the mill. The number of DDR refiner occupies the majority whereas several type of refiners are installed. GL&V/Kawanoe Zoki are to contribute to the paper mills in terms of energy saving by our advanced DDR technologies.

Fast Flash Mixing of Retention Aids and Starch with Filler before Paper Machine Cuts Production Costs and Reduces Environmental Load

Mitsuhiro Yamazaki
MATSUBO Corporation
Jouni Matula
Wetend Technologies Ltd.

  The latest outcome of the development project is flash mixing of starch or simultaneous flash mixing of starch and filler just before headbox feed pump and just before the stage where retention aid additives are mixed. The process is now in continuous production e.g. with the following results and savings: Reduced starch consumption 20%, reduced retention aid consumption 30-40%, Quality, formation, dewatering and strength properties better or unchanged. Total net efficiency increased.
  ABC concept of mixing: The new starch and filler dosing system is combined with a mixing concepts for retention aid chemicals and sizing agents. This makes the complete wet-end process even more efficient, simple, and easier to manage.

The Application of the Multifunctional Cationic Polymers for Paper Chemicals

Naho Murata, Kenji Sakai, Hiroyuki Koshio, Shohei Mitsui and Yoshimi Yoshioka
Shonan Research CenterCHYMO Corporation

  As the paper-making environment becomes severe, it is important to take measures against pitch troubles such as holes and dirt. The cationic polymer coagulants are effective against the pitch troubles because they can fix micro-pitch onto pulp fibers before growing into a large-size pitch.
  We have developed the multifunctional cationic polymers, Himoloc FR-701H, FR-801, MT-910 to improve the effect of pitch control and cope with various conditions. FR-701H is a multi-compound polymer having wide range of molecular weight and high charge density. FR-801 is also multi-compound polymer, but it differs from FR-701H in composition. MT-910 is an emulsion polymer having moderately controlled charge density, and its molecular weight is higher than general coagulant. These polymers have higher ability to fix pitch onto pulp fibers than that of conventional pitch control agents to each paper stock. In addition, these polymers have been found to show progress of the water drainage and the sizing agents effect.
  In this report, we show the characteristics and the performances of these multifunctional cationic polymers.

Novel PAM Based Dry Strength Resins

Hiroshi Suzuki and Hideo Baraki
Chiba Laboratory, Paper Chemical Business Division, SEIKO PMC Corporation

  Dry strength resin is known as multifunctional chemicals to enhance paper/paperboard strength, drainage and retention. Especially, polyacrylamide (PAM) based dry strength resin is used in various paper/paperboard grades in Japan, because of its great performance in dry strength enhancement, and controlling retention/drainage to reduce energy use for beating and dryer steam. But nowadays, performance of conventional PAM based dry strength resin has become unsatisfactory, because of the recent trends in papermaking industry toward the greater use of recycled pulp, progress for white water closed system and higher loading of fillers. In this report, novel PAM based dry strength resin with highly-branched structure, higher molecular weight and novel component, were investigated to enhance the performance of PAM under recent papermaking conditions.

Pigment Optimization in Double Coated Board

Chris Nutbeem and Tony Hirons
IMERYS Pigments for Paper & Packaging Europe
Tatsuya Narahara and Katsuhito Kawamitsu
IMERYS Minerals Japan K.K.

  In todayfs multi-coated coated board applications controlling macro-roughness has become increasingly more important as carbonate levels in recipes have risen to all-time highs in most regions. This increases the demand for coating coverage from the remaining kaolin component in the recipe. As a result we now believe it can make more sense to use the functionality of kaolin in precoating rather than in topcoating. Modest amounts of kaolin combined with coarse carbonates in precoating can improve quality and give more degrees of freedom for reformulating the topcoat to control cost.
  In this paper we show how low levels of kaolin addition to the precoat can improve coverage and evenness through pilot coater and laboratory evaluations on a recycled board basestock. We go on to explore the impact of precoat design on the finished board properties including optical evenness, print performance and varnish-ability. The impact of latex level in the topcoat is also investigated..

Start Up Report of Latest Machine for Art Paper Grade in Korea

Yasushi Tachikawa
Coating & Finishing Engineering Dept., Voith IHI Paper Technology Co., Ltd.

  MPP (Moorim P&P Co., Ltd.) DH PM1, the largest paper machine for Art Paper Grade in Korea, started its operation in Mar, 2011, supplied by Voith Paper GmbH.
  MPP is established as the company which Moorim Paper merged Donghae Pulp. Previously, Korean Art Paper Machines are using purchased (market) pulp. MPP Ulsan mill is the first mill which integrated pulp plant and paper machine. The start up of MPP DH PM1 biggest paper machine in Korea with state-of-the-art technology is remarkable news in the industry of paper business in Asia.
  This paper will introduce the outline of project including the specification of Paper machine, installation and start-up phase.

Application of Thermal Spray for Boiler

Yuji Ueno and Naoki Endo
Tocalo Co., Ltd.

  Thermal spray technologies are widely applied as one of the surface treatment technologies to obtain functions of abrasion resistance, electrical insulation properties, and corrosion resistance, etc. in various industrial worlds of steel, the industrial machinery, energy, and the liquid crystal and the semiconductor manufacture, etc.
  Thermal spray technologies are high deposit rate, low heat-affected, good portability compared with other process. So, it is suitable also for a local repair of large-scale equipment.
  A lot of our company also has the boiler for power generation and local construction results of the oil refining facility etc.
  It introduces spraying examples to the pulverized coal boiler and the circulating fluidized bed boiler (CFBC) in this text.

Application of Screw Type Steam-powered Compact Generator for Medium Steam Pressure
\ New STEAM STAR Model MSEG160M for 1.9MPaG Steam Use \

Kozo Moriyama
Energy System Department Machinery & IT Division, Shinsho Corporation

  In small-sized steam plants, as an effective countermeasure for energy saving and reduction CO2 emissions, a screw type compact steam generator unit applying to 1MPaG steam pressure range, the gSTEAM STARh has been developed by KOBE STEEL, LTD. in 2006.
  After two years, this machine has been improved power output, which is 132 & 160kW. At present time, as applying to 1.9MPaG steam pressure range, we delivered new model MSEG160M.
  This machine has many excellent features same as conventional models which shows as bellow;
  1j The generating efficiently is about 50% better than a axial flow turbine type.
  (It can be generated efficiently with step less adapted for fluctuating steam flow rate.)
  2j It has excellent pressure control characteristic comparing with pressure reducing valve.
  3j The first time of all-in-one construction package generator in the industry.
  In this paper, the details of above-mentioned features are introduced, and their application for steam systems and domestic credit system for CO2 emission are shown.

Development of Anisotropic Light Diffusion Sheet (Nano-Buckling Sheet) with LED Lighting

Daisuke Nishigori
New Business & Product Development Center, Oji Paper Co., Ltd.

  Due to growing awareness of power-saving after great East Japan earthquake disaster on March 11th, 2011, LED lighting with LED elements has rapidly become popular because of its energy-saving features compared to conventional incandescent and fluorescent lamps.
  Also, LEDs are well known as preventing insects from gathering compared to fluorescent lamps because they contain little ultraviolet rays.
  For use as lighting applications, so the LED elements arranged in a straight line are used. Although it is necessary to convert the LED spot light sources to a line source or an area source by diffusing light in order to obtain the appearance similar to fluorescent lights, the traditional diffusion method has the problem of the reduction of illuminance.
  Oji Paper succeeded in development of anisotropic light diffusion sheetiNano-buckling sheetj, which can be replaced with the conventional light diffusing methods to achieve higher light extraction efficiency avoiding the reduction of illuminance .
  This paper reports on features of anisotropic light diffusion sheet (Nano-buckling sheet) with LED Lighting.

Recent Developments in Patent Administration

Yoshihiro Fuji
Japan Patent Office

  In this report, the recent developments in patent administration are briefly explained, based on the authorfs presentation given at the annual meeting between the Japan Technical Association of the Pulp and Paper Industry (TAPPI) and the Japan Patent Office (JPO) in February 2012. The report focuses on the current status of patent applications and examinations in Japan, the recent trend of patent applications in the world, and the JPOfs user-friendly programs to meet the applicantsf diversified demands, in particular for their globalized intellectual property activities.
  The number of patent applications of Japanese applicants in Japan has declined in the late 2000fs. However, the expenditure on R&D in Japan has gradually risen. It seems that the Japanese applicants have continuously made their efforts to develop new technologies, despite the economic downturn of Japan. Moreover, the global application rate and the number of PCT applications have been going up. It is assumed that they have turned their attentions towards the global market.
  The JPO has offered a lot of user-friendly programs, in particular to encourage the Japanese applicants to compete in the globalized business fields. The JPO launched the Patent Prosecution Highway (PPH) with the United States Patent and Trademark Office (USPTO) in 2006 and has established the PPH network with 19 Patent Offices until February 2012. In addition, the JPO is now designing the global IP initiatives in order to guarantee that the Japanese applicants can expeditiously obtain secured patent rights all over the world.
  It is expected that the report will help the members of the TAPPI design their own patent strategies and promote their international competitiveness.

Report of 2011 TAPPI PEERS Conference and International Pulp Bleaching Conference

Koki Kisara
Oji Paper Co., Ltd.
Tadafumi Hashimoto
Nippon Paper Chemicals Co., Ltd.

  2011 TAPPI PEERS (Pulping, Engineering, Environmental, Recycling and Sustainability) Conference and IPBC (International Pulp Bleaching Conference) were held in Portland, OR, USA from October 2 to 7. The PEERS Conference included 62 oral presentations, 7 Panel sessions and 3 Workshops, and total participants were 450 people. The IPBC also conducted with 26 oral presentations including 3 plenary lectures and 9 poster presentations, and total attendees were 150 people. In this report, the review of these conferences and some presentations are presented.

Development of a New Cooking System Using Highly Concentrated Polysulfide (V)
\ Effect of Anthraquinone Addition on PS Cooking of Hardwoods \

Keigo Watanabe, Yasunori Nanri, Yasuhiro Okamoto and Masahiro Shimizu
Nippon Paper Industries Co., Ltd.
Hiroshi Ohi
Graduate School of Life and Environmental Science, University of Tsukuba

  Polysulfide and anthraquinone methods are well-known technologies available today to increase pulp yields of kraft cooking. Since polysulfide is produced by oxidation of white liquor, Na2S concentration in the liquor decreases as the oxidation proceeds. This decrease of Na2S concentration sometimes causes increases of kappa numbers of pulp and screened rejects in polysulfide cooking. For developing highly concentrated polysulfide cooking, we investigate the effects of anthraquinone addition at various polysulfide and Na2S concentrations. Statistical analysis using the multivariate analysis of variance method was carried out to examine in detail the effects of polysulfide and anthraquinone, which have been reported to exert a probable a synergistic effect.
  The result showed that the anthraquinone addition mainly reduced kappa numbers of pulp at a given active alkali charge without any decrease of pulp yields, and that the increase of polysulfide concentration raised screened pulp yields with a slight increase of kappa numbers. Thus, each anthraquinone and polysulfide contributed to the increase of pulp yields at given kappa numbers individually. There was no interaction between the effects of polysulfide and anthraquinone. It is considered that a synergistic effect of polysulfide and anthraquinone should be explained by the fact that anthraquinone can compensate for increases of kappa number and screened rejects caused by the lack of Na2S concentrations in polysulfide cooking. Therefore, anthraquinone addition is particularly effective for highly concentrated polysulfide cooking to obtain high pulp yields.