TAPPI JOURNALVol. 56, No. 9
September 2002 Abstracts
Sheet Formation Technology on Roll-Blade Former
Hiroshi Iwata and Kazuhiko Masuda
Mitsubishi Heavy Industries, Ltd., Hiroshima R&D Division
Mitsubishi Heavy Industries, Ltd., Paper& Printing Machinery Division
The purposes of newly developing for MJ series paper machine are to accomplish
higher production and operator-friendly operation at 2000 mpm.
Since the forming section requires stable sheet forming and good quality of
paper on high-speed operation, a suction forming roll at initial drainage zone
and the wedge-shape blade was opposing counter blade at mid-mat forming zone
are incorporated in MJ former.
And today, we are able to propose blade former or roll-blade former according
to user needs.
In this paper, we present the results of drainage element studies and pilot
The newest high-speed board paper machine−Top Quality at Top Speed−
Machinery group, Paper machinery division, Sumitomo Heavy Industries, Ltd.
Even though targeted speeds are approaching each other on printing paper and
board machines, there are many distinct differences in the machine lines.
Two Former achieved essential strength properties for board paper.
Closed transfer without the center roll is more important with low quality waste
paper than with virgin pulp.
Surface sizing of boards is different from fine paper. The need to achieve full
penetration is essential. Full penetration means weaker runnability properties.
The TurnDry contactless dryer is a great tool in this respect.
Final dryness is reached by two tier felting in order to control the curl of
All these sections and components within each section makes a line ? Opti Concept
line for Boards at high speed.
How to Fulfill the New Requirements of the Wet End Process?
Bernhard Mu(･･)ller1,Masakazu Eguchi and Jun Eguchi
Engineering & Development Division, Voith IHI Paper technology Co., Ltd.
The future generation of paper machines will be characterized by increased operating
speeds and at the same time higher product quality demands, including machine
directional (MD) and cross machine directional (CD) profile stability.
To meet these new requirements, the wet end process (WEP?) around the wet end
of the paper machine needs to be redesigned. New machines and tools are presented
here for mixing the stock and filler components, for white water dilution, stock
cleaning and deaeration, adding of retention agents and for the entire white
The overall goal is to optimize the entire WEP? for more profitable operation.
Advanced Wet-end Concepts to Stabilize Paper Machine Running
Roland Berger, Lydia Bley and Rainer Rauch
MUETEK Analytic GmbH
Over ten years of experience with on-line charge demand analysis has shown that
measurements conducted in white water frequently fail to produce meaningful results.
One reason, among others, is that white water contains different charge carriers,
such as fines, fillers and colloidally dissolved anionic material. In addition,
charge carriers that are neutralized upstream from the white water basin escape
detection at this particular sampling point. In view of the ongoing trend towards
more complex retention aid systems and the increased use of recovered waste paper
furnishes, charge measurements in white water are losing importance. Instead,
on-line charge measurements should be performed at the source of anionic trash,
for example coated broke, TMP or DIP. Another likely measuring point is after
the addition of a chemical aid into the thick or thin consistency stock.
BTF Headbox System A New Dilution Control System for Existing Headbox
Design Sec. ，Kawanoe Zoki CO.,Ltd
The demand for improved paper quality is requiring mills to produce paper with
less variation in basis weight profile and improved fiber orientation uniformity.
Conventional headbox profile control by slice bending is limited in its ability
to meet these demands. Mechanical restrictions limit the precision of the basis
weight profile control, and slice bending causes changes in the local flow rate,
jet velocity and direction resulting in non-uniform cross machine fiver orientation.
Dilution control systems are therefore becoming more common as a replacement
for conventional slice lip control. These systems can provide better CD basis
weight control without interaction with fiber orientation.
Latest on-line calender technology Janus MK2 calender
Engineering dept.，Voith IHI Paper technology Co., Ltd.
Market demands to improve the paper quality and production efficiency, however,
off line supercalender is available for highly compressed paper applications,
i.e. A1, A2 coated paper and / or SC paper, etc. The supercalenders are becoming
bottleneck. Voith Paper developed the Janus calender focusing on-line installation
in 1996, it is now improved as Janus "MK2" with state of the art. Following
provides an introduction of the Janus MK2. The technical and technological possibilities
of this Janus "second generation" to be installed online are presented.
Development of Mitsubishi High-Speed Film Coater
Masahiro Sugihara and Kenji Yamada
Mitsubishi Heavy Industries, LTD. Hiroshima R&D Center
Hiroshi Miura and Toshiaki Miyakura
Mitsubishi Heavy Industries, LTD. Paper & Printing Machinery Division
Mitsubishi High-Speed Film Coater (MJ Film Coater) has been developed as the
on-machine film coater and size press for our newly developed high-speed papermaking
machine (MJ series). In this development, we mainly focused on the reduction
of "misting" which occurs at the outlet of applicator roll nip in high-speed
coating. Non-dimensional characteristics of misting phenomena have been got in
this investigation. According to the results, the state of the art "Continuous
Contact Length Control System" and "Low-Adhesive Applicator",
which realize the reduction of misting in high-speed coating, have been developed.
In this paper, we report the results of fundamental studies and the outline of
our new film coating technologies briefly.
The coating application using the Excellent Flow Modeling Software FLOW-3DR
FLOW-3DR is a unique computational fluid dynamic program that was developed
by flow science inc. in us. FLOW-3DR has a full navier-stokes solver based on
the fAVORR (fractional area volume of obstacle representation) finite difference
scheme. the true vof (volume of fluid) algorithm is incorporated into FLOW-3DR
that provides the reliable free surface flow analysis. FLOW-3DR has a variety
of physical models. therefore FLOW-3DR is used in the wide range of industrial
area including the inkjet or the coating. in this paper the feature of FLOW-3DR
and the direct computation of dynamic contact lines, the application examples
for the coating are described.
Tesa EasySplice FastLine
New Flying Splicing Tape Technology for Improved Productivity
Bernhard Gebbeken Dr.-Ing.
Kashiwabara Yuki and Mukasa Munetaka
Tesa EasySplice, a new flying splice tape technology for straight line splicing
in paper production is introduced. The tape design and function will be explained.
In the next step various methods for splice preparation will be presented. Process
improvements for offline coaters are: no air pockets during acceleration of the
new jumbo roll, no wet areas after coating, less tape and no labels. This means
increased productivity for the paper manufacturer due to higher splice security,
faster splice preparation, higher splicing speed. Experiences by european customers
and their product evaluation will be shown. Also experiences by a machine manufacturer
is presented. An outlook is given to the application of flying splice at offline
Application of New Evaluation Method of Sheet Appearance to Various Coated Papers
Kasuke Fujita, Nobuhiro Matsuda, Hisashi Matsui and Yoshiaki Zama
Polymer Research Laboratories, JSR Corporation
Coated paper is required to have excellent sheet appearance. And it is well
known that sheet appearance is affected by gross profile. Evaluation of sheet
appearance is generally determined by visual inspection. However the evaluation
method is subjective and not quantitative, so that the evaluation of sheet appearance
is too difficult. For purpose of quantitative evaluation of sheet appearance,
a few methods have been reported.
We reported that we developed a new evaluation method of sheet appearance of
coated paper with using Scanning White-Light Interferometer(ZYGO New View system).
And we found that the standard deviation of average of surface slope angles(ASSA)
was strongly related to sheet appearance. That is, we can conclude that the more
distribution of ASSA becomes uniform, the more sheet appearance becomes better.
In this paper, we measured distribution of ultra fine surface profile of various
commercial coated papers, and studied influence of the standard deviation of
ASSA to sheet appearance.
As a result, we found that the optimal threshold of ASSA at binarization changes
with kinds of coated papers and optimal threshold is ±7°for A2 coated paper or
±10°for A3 coated paper. We also found that correlation with sheet appearance
is the best, when it is not concerned with the kind of coated papers but the
slope angle area ratio(SAAR) at binarization becomes 70%.
Keywords: Sheet Appearance, Coated Paper, Surface Profile, Standard Deviation,Scanning
White-Light Interferometer, Surface Slope Angle, Binarization
Reports of 2002 International Pulp Bleaching Conference
Takanori Miyanishi, Ph.D.
Pulp and Paper Research Laboratory of Nippon Paper Industries Co., Ltd.
A historical and technological review of the 17 International Pulp Bleaching
Conferences from 1955 to 2002 confirms that the pre-eminent bleaching conference
is indeed international. About half the papers had overseas authors. The "Big
Four" countries Canada, USA, Sweden, and Finland dominate, but other countries,
such as Brazil, have recently increased their share of papers considerably. The
most recent bleaching technology milestones to be implemented in industrial operations
are ozone bleaching and acid hydrolysis removal of hexenuronic acid.
Keywords: bleaching, ECF, mill closure, ozone, hexenuronic acid
Environmental Evaluation on Melting Treatment of Paper Products
Japan Science and Technology Corporation
Graduate School of Engineering, Tokai University
Satellite Venture Business Laboratory, Shizuoka University
Hiroyasu Sakamura and Itaru Yasui
Institute of Industrial Science, University of Tokyo
At present, there are some environmental problems such as an increase in the
domestic waste and a shortage of landfill site in Japan. Especially, the amount
of paper products (newspaper, photocopy paper, corrugated board, weekly magazine,
gravure magazine, catalog, etc.) accounting for more than 50% of all domestic
waste has been increasing. Therefore, the reduction of its incineration ash becomes
a pressing task for using the landfill site as long as possible. In this study,
the effect of melting treatment on the reduction of paper products was investigated,
and the amounts of chlorine in combustion gas and in residual ash generated from
each paper product were evaluated.
The melting treatment was found to reduce effectively the amount of paper products,
and therefore to be effective for prolonging period of landfill site in Japan.
The chemical composition of the slag prepared by melting paper products was mainly
composed of several compounds in the SiO2-Al2O3-CaO system, and the slag was
suitable for preparing various glasses. Furthermore, the melting temperature
decreased in increasing amounts of glass cullet that was mixed with combustion
ash. The amounts of Pb and Sb eluted from the molten slag in pure water, salt
solution (3.5wt%) and acid solution (pH3) were much lower than those from the
combustion ash. In addition, the chloride gas and chloride compounds in residual
ash generated from the combustion of paper products were scarcely detected. These
results suggested that the amount of toxic chlorine emitted by melting paper
products is extremely small.
Keywords：Paper products, Melting treatment, Molten slag, Residual ash, Chlorine
Dioxins Levels in Chlorine Dioxide Bleaching of Hardwood Oxygen-bleached Kraft
Levels before and after Mill Operation of Chlorine Dioxide Bleaching
Institute of Agricultural and Forest Engineering, University of Tsukuba,
Some results of the plant-effluents from chlorine pulp bleaching mills showed
the total TEQs are less than the effluent standard: the permissible limit for
specified facilities（10pg-TEQ/L), but more than the environmental standard for
public water（1pg-TEQ/L). The TEQs of 1,2,3,6,7,8- and 1,2,3,7,8,9-HxCDD are partly
responsible for surpassing it. The origin of the HxCDDs in the effluents is thought
to be the TeCDD in an agrochemical, but not to be lignin.
In Japan, CNP (chloronitrofen: an agrochemical made from chlorinated phenols)
had been scattered in paddy fields as a herbicide. It has been clarified that
CNP includes 1,3,6,8-TeCDD, 1,3,7,9-TeCDD and 2,4,6,8-TeCDF. It was found in
some results of analysis that concentrations of 1,3,6,8- and 1,3,7,9-TeCDDs in
effluents from kraft pulp bleaching plants are relatively high, for example,
100pg/L for 1,3,6,8-TeCDD. The toxicity equivalency factors (TEFs) for 1,3,6,8-
and 1,3,7,9-TeCDD are not defined yet by WHO1998, and then their concentrations
do not consist of the total toxicity equivalency quantity (Total TEQ). However,
the TEFs for 1,2,3,6,7,8- and 1,2,3,7,8,9-HxCDDs are defined as 0.1. Therefore,
the total TEQ of the effluent may increase if the HxCDDs form from the TeCDDs
Some results of the plant-effluents from ECF (chlorine dioxide) pulp bleaching
mills showed the total TEQs are lower than the environmental standard (1pg-TEQ/L).
It was found in some results of analysis that concentrations of 1,3,6,8- and
1,3,7,9-TeCDDs in effluents from kraft ECF pulp beaching plants are relatively
high, for example, 440pg/L for 1,3,6,8-TeCDD, which should be impurities in the
CNP. Laboratory bleaching using a mill LOKP and chlorine dioxide in the range
of KF:0.14-KF:1.14 have shown that 2,3,7,8-TeCDD and TeCDF are not detected.
It is considered that water qualities of process sewers in ECF pulp bleaching
mills should be less than the environmental water quality (1pg-TEQ/L).
Keywords: Dioxins, Pulp Bleaching, Chlorination, Agrochemicals, Chlorine dioxide,
Herbicide, Chloronitrofen,1,3,6,8-Tetrachlorodibenzo-p-dioxin, ,2,3,6,7,8-Hexachlorodibenzo-p-dioxin