JAPAN 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 machine trials.
The newest high-speed board paper machine−Top Quality at Top
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
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 the web.
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 water handling.
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
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
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
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
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 Pulp (II)
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 by chlorination.
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