November  2007  Abstracts

The Newest Finishing Equipment

Toshio Aoki
Maruishi Co., Ltd.

  Maruishi has been making an unlimited effort to develop the best modern finishing equipment. In addition, Maruishi has many technology partner ship such bielomatik-Jagenberg GmbH, Trancel AB, Saimatec Engineering, Function Control BV, total 11 world-famous companies. In the rapidly changing international market today, End users are demanding the high Quality, High productivities. Maruishi would like to introduce from the Automatic Roll Storage System until Automatic Truck loading/Unloading system which we can make a large contribution of this Paper industry.

The Efficiency Progress with Sheet Sorting

Hiromu Nakamura
Hokuetsu Kamiseisen Co., Ltd.

  This is the following report that was told as gThe Approach for No Manual Sorting System - The labor-saving history in sheet finishing processh at Japan TAPPI Annual Meeting in 2006. The previous report dealt with paper finishing without resorting based on gthe quality verification activityh. In this report, the labor-saving strategy by finishing line renewal is described. The labor-saving is achieved by the combination of the quality verification chain and the latest paper finishing machinery.

Advanced On-line Multinip Calender

Hidehiko Yamazaki
Metso Paper Japan Co., Ltd.
Juha Linja
Metso Paper Inc.

  OptiLoad calender is a new generation multinip calender of Metso paper. The advances in both mechanical and process technologies have made it possible to achieve high quality-surface finishing at high speed. OptiLoad has its own special features such as specially designed roll-weight relieving mechanism, application of high-temperature thermo roll, special roll configuration, uniform nip load through top to bottom roll and so forth.
  Metso Paper has delivered more than 50 OptiLoad calenders with on-line and off-line. Nowadays, wide range of the application is admitted with related technology development. In this paper, the multinip calender technologies for on-line application for coated paper grades and non-coated paper grades such as SC paper are described.

Operating Experience of Janus Calender

Junichi Kanayama
Yonago Mill, Oji Paper Co., Ltd.

  The N-1 Coater Machine at Yonago mill, Oji Paper, has been operating since September 1997. The coating width of this coater machine is 7290mm and the design coating speed is 1600m/min, it produces 835tpd of woodfree coated paper.
@The Janus Calender has installed next to the coating section as an on-line supercalender, which was the first case in the world. For the purpose of adopting on-line supercalender was to reduce initial investments and maintenance costs, to achieve higher personnel productivity, and to produce coated paper of better quality. This Janus Calender consists of 2 stacks with each 5 rolls, it can get the quality that is similar to an off-line supercalender. This article introduces the latest operating experiences of the N-1 Coater Machine and the Janus Calender.

Operating Experience of Iwakuni PM9 On-line Hot Softnip Calender

Kiminobu Kakino
Iwakuni Mill, Nippon Paper Industries Co., Ltd.

  The start-up of No. 9 paper machine of Iwakuni Mill was in 1997, a decade ago. Currently, its capacity is approximately 700 metric ton per day for woodfree LWC paper (A3 grade). To obtain higher productivity, the No. 9 paper machine was designed as a conbination model of paper machine and coater. It's also equipped with Hot Softnip calendar (4stucks) to achieve high temperature and high pressure finishing process.
  This report is a summery of the operating experience about vertical four stucks Hot Softnip calender.

Slitting of Core Paper
- Cost Saving and Slitting Quality Improvement through Slitting Process Automation -

Heinz Herkenrath
DIENES JAPAN (at Mack3 Enterprise, Inc.)

  Slitting technology has been subject to rapid developments in recent years. With todayfs top-quality tools, slitting at higher speeds is no longer wishful thinking. At the same time, better results are achieved in terms of edge quality, dust generation and knife service life. This means, that in many existing slitting systems, there is an enormous efficiency and cost-saving potential, which should be tapped by applying state-of-the-art technologies.
  The history of continuous slitting goes back to 150 years and Dienes has been involved in making this history for at least half of that period. This is documented by numerous national and international patents.
  Dienes' scope of supply includes the respective slitting tools like dished, top and bottom knives as well as multiple knife blocks of different material quality and surface finish and last but not least knife positioning systems in manual, semi- or fully-automatic design.

Operating Experience of New Slitting System at PM7 Winder

Yasuhide Hirota
Sobue Mill, Oji Paperboard Co., Ltd.

  In January 2005, and after a two year rebuilding program concentrated on improvements to the production system ,Oji Sobue restarted paper machine #7 producing Linerboard. The main objective of this rebuild program was to introduce the latest technologies available to the industry to maximize production efficiencies with special emphasis on the newest Slitting positioning system developed by German machine manufacture. This slitting positioning system was the first one of its kind installed in Japan. The improvements of the slitting system have reduced substantially the number of mechanical breakdowns and machine stoppages, while dramatically improving slitting accuracy, quality and cleanliness while practically eliminating any dust problems, which previously were an area of great concern to Oji Sobue.
  These improvements helped reduce operating costs and improve quality with fewer blade changes easier maintenance and operator friendly interfaces, the solution of the dust problems contributed for the elimination of a dust collecting system, thus also contributing for significant energy savings.

VariPlus Single Drum Winder for WFC Grade

Michio Takahashi
Voith Paper Co., Ltd.

  The single drum winding is better winding solution for high density and smooth product. Especially WFC paper grade requires premium quality of roll hardness structure without any winding faults. On the single drum winder, each paper roll is wound in a separate station and supported on a single drum. Each winding station is practically a separate machine. Therefore this type of winder is technologically predestined for various ranges of paper grades and product needs. However, operation resources and high maintenance was required. The VariPlus single drum concept has been thoroughly modernized with a much higher degree of automation. We Voith aim thereby to enhance machine productivity by increasing operating speed without risk and optimizing automation for greatest reliability and time savings.

Enhanced Use of Advanced Web Inspection System and Winder Advisor System

Atsushi Kurosaki
Surface Inspection Systems Division, COGNEX K.K.

  Cognex developed gSmartLearnRh, a useful l classification tool. It was designed such that the latest learning classification technology can be combined with expert knowledge of each application. SmartLearn dramatically improves defect classification accuracy.
  The usage of gAWA (Advanced Winder Advisor)h further streamlines the re-reeling process. Automatic and accurate stopping at desired defect positions improves winder operation not seen before.

Report on 2007 TAPPI Coating & Graphic Arts Conference

Masanori Kawashima
Nippon Paper Industries Co., Ltd., Pulp & Paper Research Laboratory
Hideaki Yamada
Oji Paper Co., Ltd., Pulp & Paper Research Laboratory
Mitsutaka Kondo
Oji Paper Co., Ltd., Material Analysis Center

  2007 TAPPI Coating and Graphic Arts Conference was held in Hyatt Regency Miami, FL, U.S.A. from April 22 to 25. There were 24 sessions and 69 presentations in this conference. This international conference attracted over 400 participants from around the world. We had an opportunity to join the conference and made a summary of interesting 14 presentations in this report.

Development of Manufacturing Process for High Quality Calcium Carbonate by Causticizing Process in a Kraft Pulp Mill (Part3)
- Scale-up Trials at Pilot and Mill Plant for Rice-like Particles -

Yasunori Nanri, Haruo Konno and Hideyuki Goto
Nippon Paper Industries, Co., Ltd., Pulp and Paper Research Laboratory
Yasuhiro Okamoto
Nippon Paper Industries, Co., Ltd., Ishinomaki Mill
Kazuto Takahashi
Nippon Paper Chemicals, Co., Ltd., Gotsu Mill

  Precipitated calcium carbonate is produced as a by-product in the causticizing process of the kraft pulping process. There are many advantages to use this by-product, causticizing calcium carbonate (CCC), as filler and coating pigment in paper. By using this CCC for paper materials, lime-kiln operation would be reduced or eliminated, resulting in the reduction of fuel oil for calcination of calcium carbonate. Furthermore, accumulated impurities in the lime cycle can be removed constantly. In our previous reports, we showed that CCC particles with a various kind of morphology were obtained by separating and precisely controlling the two reactions of slaking and causticizing in the causticizing process. Among these morphologies, rice-like particles can be produced with the least process modification. Then, production trials at laboratory, pilot, and mill scale plant were carried out to investigate the possibility of production of the rice-like CCC at mill.
  Since main purpose of causticizing process is to produce white liquor, the white liquor separation from the CCC slurry is very important for kraft pulp production. To increase the particle size of CCC is one of the most promising way to accelerate the white liquor separation. Therefore, the production methods of the secondary particles having lager particle size were investigated by the step-wise addition and the continuous addition of slaked lime slurry and green liquor against the primary particle. In this paper, results of the production trails of the rice-like CCC at laboratory, pilot, and mill scale plant are reported.

Keywords: Causticizing reaction, calcium carbonate, pilot plant, mill plant, scale-up

Influence of Cooking Conditions on Pulp Properties of Acacia auriculiformis in Kraft Pulping

M. Sarwar Jahan
Pulp and Paper Research Division, BCSIR Laboratories
R. Sabina and A. Rubaiyat
Department of Applied Chemistry and Chemical Technology, Dhaka University

  Acacia auriculiformis was subjected to kraft pulping by varying operational variables, such as time, temperature, and active alkali charge. A central composite design was used to investigate the influence of operational conditions on the pulp properties (total pulp yield, screened pulp yield, kappa number tensile index, burst index and tear index). A second order polynomial model consisting of three independent variables was found to accurately describe the kraft pulping of Acacia auriculiformis. The minimum R2 value was above 0.94, which supported well fitting in the proposed equation. The values of screened pulp yield, total pulp yield, kappa number, tensile index, burst index and tear index at the central point of operational variables were 43.5 %, 44.6 %, 26.1, 41.7 N.m/g, 3.3 kPa.m2/g and 12.3 mN.m2/g, respectively, which are within the vicinity of predicted value.

Keywords: Acacia auriculiformis pulping, Central composite design, Dependent and independent
              variables, Multiple non-linear regression, Pulp properties