2011年8月 紙パ技協誌

Vol.65 No.8 Abstracts

Effects of Metso Washers on Fiberline

Hiroshi Yamashita
Sales & Marketing Fiber Business Line, Metso Paper Japan Co., Ltd.

The main purposes of washing before bleaching plant in a kraft pulp mill are (1) minimizing the wash loss into bleaching plant, (2) recovery of heat source, (3) recovery of alkaline chemical. In order to accomplish those purposes, many kinds of washers have been developed. Metso continuously has been researching and developing washing technology since the first press washer was launched in 1954. As a result of such development, the fifth generation press washer which is called TwinRollTM Press Evolution started operation in 2009.
On the other hand, Metso has a different type and an effective washer called Pressure Diffuser (PDW) which can operate under high pressure and high temperature condition. Especially the new unique system called DiConnTM system in cooking plant which was developed by Metso enables a mill to improve and optimize the heat recovery in a cooking plant. The combination of DiConnTM system and digester operation optimization brings not only improvement of washing efficiency but also further reduction of steam consumption.


-STEAM STAR is the Screw Type Steam-powered Compact Generator, this Machine has Improved Power Output, which is Maximum 160kW-

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

  In small-sized steam plants, as a effective countermeasure for energy saving and reduction CO2 emissions, a screw type compact steam generator unit “STEAM STAR” has been developed by KOBE STEEL, LTD. in 2006.
  At present time, this machine has been improved power output, which is 132 & 160kW.
  This machine has many excellent features as bellow;
  1) The generating efficiently is about 50% better than a conventional turbine type. (It can be generated efficiently with stepless adapted for fluctuating steam flow rate)
  2) It has excellent pressure control characteristic comparing pressure reducing vale.
  3) The first time of all-in-one construction package in the industry.
  In this paper, details of above-mentioned features are introduced and shows their application for steam systems, domestic credit system for C02 emission.

Development of Novel ASA Sizing Agents
-Internal ASA Sizing as an Alternative to Rosin Sizing-

Yasushi Fujiwara, Teruyuki Matsushima and Tadayoshi Oguni
Chiba Laboratory, Paper Chemical Business Division, SEIKO PMC Corporation

  In Japan, rosin sizes are most widely used as internal sizing agents. Even under the neutral papermaking conditions, rosin sizes have been also used due to the unique development of neutral rosin sizes in Japan. However, some of papermakers in Japan have requested the alternative sizing agents to rosin, because of rapid increase in its price since the end of 2009. Thus, we have adopted alkenyl succinic anhydride (ASA) as one of the alternatives and developed novel ASA sizing agents based on research and development of emulsifiers (polymer surfactants), emulsification methods, and application procedures. The novel ASA sizes have potentialities to bring fundamental solutions to the most serious problem inherent in ASA sizes such as formation of deposits in papermaking.

-Improving the Productivity and Formation by the Increasing the Dewatering Capacity-

Yasuyuki Yazaki
Research and Development, Kobayashi Engineering Works, Ltd.

Not only responding to but also creating the end-users’ needs which have changed from time to time, Kobayashi continues to meet demands in pulp and paper industry by introducing various sophisticated formers with independently developed technologies.
Ultra Former Series firstly developed since early 1960’s, with remarkably improved productivity and sheet quality in addition to initial cost, labor and energy savings, have been installed with 700 units to 120 complete paperboard machines around the world.
The export of 280 units for Ultra Former Series to 17 overseas countries has earned Kobayashi a solid reputation for “Kobayashi, as Ultra Former” in multiply paperboard industry of each overseas country even at present.
This paper is to introduce the method for realizing further improvement of productivity and sheet formation by increasing the dewatering capacity, achieved by the modification made to “High Speed Ultra Former” which is capable of higher productivity in Ultra Former Series.

Function of Pigments for Paper Application
-Development of Pigments for Environmental Friendliness-

David I. Gittins, Leslie McLain, Paul Meizanis and Roger Wygant
Development and Technology group, Imerys Research
Makoto Suzuki, Tsukasa Yokoyama and Fumihiko Murata
IMERYS Minerals Japan K.K.

  Over the past decade, the pulp and paper industry along with its suppliers has come to realize that acting in a sustainable manner is in the best interests of all stakeholders. The increasing importance of the triple bottom line (improved profits, environment and community) is obviously by reading most paper producer’s web sites. The industry is now making efforts to act in a more sustainable manner while maintaining a profitable business model. In this paper, we would like to introduce Imerys work on the new technologies called Barrisurf, Fiberlean and Starch encapsulated Kaolin (SEK) which are developed to help the industry reduce its carbon footprint, diminish use of environmental bad actors, and increase the use of more earth friendly products that are easily recyclable.

New Method of Monitoring Paper Machine Dynamics with Video

Kazutaka Fujita
Yokogawa Electric Corp.
Jun Nishimura
Engineering Dept., Yokogawa & Co., Ltd.

  Many paper machine parameters and problems are difficult or even impossible to monitor due to the lack of or inadequacy of available methods and sensors. Thus, many issues cannot be quantified and properly addressed. Feature Extraction and Identification (FEI) technology (IVS, 2009 patent pending) addresses this challenge with a novel utilization of paper machine video for a wide range of issues such as paper edge problems, sheet flutter, sheet release point, and others. FEI also provides a simple alternative for the monitoring and display of sheet breaks, table formation, and holes.
  FEI can be used as part of a sheet break or portable video troubleshooting system, where, along with sheet break capture and various other troubleshooting tools, FEI is effectively used to monitor and troubleshoot operation issues.
  FEI can also be used as an exclusive tool for monitoring certain parameters critical to paper machine operation. For example, when placed on the winder, a dedicated FEI system will provide real-time displays (trends) of paper edge movements, cut lines, and slitting knifes.

Integration between Web Inspection System and Web Monitoring System

Shuichi Shoda
Surface Inspection Systems Division, COGNEX K.K.

  COGNEX developed “SmartSystem”, an integrated system between “SmartView” Web Inspection System (WIS) and “SmartAdvisor” Web Monitoring System (WMS). “SmartSystem” has a “Single User Interface” with defect information and monitoring images. And, synchronization between WIS camera and WMS camera is accurate so that the system allows user to track source of defects and help them to improve their process.

Achievements in Industrial Ozone Bleaching

Emil Germer
St. Petersburg State Forest Engineering Academy
Alexis Metais*2 and Dr. Jean-Christophe Hostachy
ITT Wedeco

  First industrial production of ozone bleached pulp started almost 20 years ago in connection with increasing environmental pressure and the Total Chlorine Free (TCF) wave. Like many other new technologies, ozone bleaching did not immediately reach its optimal efficiency from a technical viewpoint, but had to face several issues during its early years. By improving mixing technology, better understanding ozone chemistry on pulp components and tuning the whole process, the so-called ECF-Light bleaching sequences - including an ozone stage - made it possible to deliver a pulp quality similar or better than conventional ECF bleaching would do. Today the choice of ozone may still be motivated by ecological requirements but it is mostly justified by the economical savings resulting from chemicals costs cut-off. Actually, both targets are reached simultaneously when implementing an ozone bleaching stage. Through several industrial results, this work describes process improvements in ozone bleaching since 1992 and points out why should ozone now be considered as a the keystone of modern pulp bleaching processes.

Keywords: ozone bleaching, ECF-Light bleaching, TCF- bleaching

Influence of Soluble Anthraquinone Compound on Bleaching Load during Kraft Cooking of Various Woods

Shiho Takahashi, Mitsuko Homma, Mikio Kajiyama and Hiroshi Ohi
Graduate School of Life and Environmental Sciences, University of Tsukuba
Junji Tanaka
Kawasaki Kasei Chemicals Ltd.

In this study, the influence of soluble anthraquinone compound (SAQ) addition to the kraft cooking process on decreasing the load of elemental chlorine free (ECF) bleaching was investigated by analyzing unbleached pulps. As a cooking additive, 1,4-dihydro-9,10-dihydroxyanthracene sodium salt in alkaline solution (SAQ) has been used to accelerate delignification in many kraft pulp (KP) mills. The addition of SAQ resulted in increased pulp yield as well as increased pulp brightness among all investigated hardwood and softwood pulps. Furthermore, the hexenuronic acid (HexA) content in unbleached pulp was not affected by the addition of SAQ under the same cooking conditions. Therefore, it is likely that the load of ECF bleaching will not increase with the addition of SAQ. The most important benefit of the addition of SAQ was found to be a decrease in the kappa number along with an increase in the pulp brightness to induce a decrease in the bleaching load.

Keywords: acacia, eucalyptus, pine, kraft cooking, pulp brightness, hexenuronic acid