JAPAN TAPPI JOURNALVol. 57, No.4
April 2003 Abstracts
KAMYR Technology − Past, Present and Future
KVAERNER PULPING KK
Kvaerner Pulping is the successor of KAMYR, and the company has been the
actual founder of modern pulping technology.
In this paper, some of the milestones of achievements of KAMYR are listed,
however the focus is not on the history but on today and on the
future, although I believe having a rich history in a very strong
advantage in designing for the future.
I will give an overview of the big trends in the pulping industry and today’s
spearhead technology from Kvaerner Pulping.
Kvaerner Pulping considers the guiding stars of today in the further development
of the supplier industry are "Simplification", "Software/Process
solutions" and "Flexibility".
Kamyr has the history ? Kvaerner has the future and we will intensity and accelerate our efforts in the field of R&D.
New Screens for Simplification and Power Saving of Screening
Aikawa Iron Works Co., Ltd.
As an international environmental protection movement rising, power saving
has been one of the major subjects to be concerned for the stock
preparation field for paper board and de-inking in these several
years. And today, there is an another strong requirement of power
saving according to the background of the international agreement
for CO2 reduction, and also for improvement of cost reduction
in order to cope with global price competition and so on. For
the waste paper treatment, as el known that the screening process
occupies a large portion of energy consumption. It is estimated
that the power consumption of screen process is 3 to 3.5KW/Ton
for the stock preparation of the paper board, and 4 to 6KW/Ton
for the de-inking plant. This paper reports about new screens,
which are called as "Screen-One, Two and Three", "GFD
GranFlow" and "CanisterScreen" With these screens,
the screening system is simplified and dramatic power saving
can be achieved.
The Application of High Speed Paper Making Technology
Mitsubishi Heavy Industries, LTD., Paper & Printing Machinery Division
A new Mitsubishi high-speed paper machine development project has started
in 1999 and the new product is called MJ series to produce quality
paper at 2000 m/min operation speed. The MJ series has been developed
in the course of the elementary study, program simulation, model
test, and final verification on our pilot paper machine in Mitsubishi
R&D center of Mihara, Japan.
This paper presents the several challenges we were faced with
when we tried high-speed operation on our pilot machine and also
presents some useful products for stable operation.
Analysis of Forms and Distributions of the Paper Chemicals on Paper−The Approach with Novel Equipments−
Research & Development Center, Arakawa Chemical Industries, Ltd.
The fixing of paper chemicals (sizing agent and/or strengthening agent)
has been evaluated, in terms of "quantity", such as
content % in paper, and the form of fixation has not intensely
Also, the fundamental observations of detailed pulp structure and distribution
of paper chemicals on the pulp were not simple tasks.
In recent years, the progress of analytical technologies has been enabling
the detail evaluation of paper and/or pulp surface in simple
process and the observation of paper chemicals on the micro-fibril
has become possible.
The newest analysis results for forms and distributions of sizing agent
and/or strengthening agent on the paper and/or pulp fiber by
utilizing X-ray Photoelectron Spectroscopy (XPS) and Scanning
Probe Microscopy (SPM) is reported in this presentation.
Observation of the Configuration of Binder Latex in Coating Layer-Direct Observation Technology of Binder-
Kenji Arai, Yoko Saito, Hideki Touda and Jyunji Kasai
R&D Center, ZEON CORPORATION
Printability of coated paper is influenced by the coating structure in which
the binder plays an important role. It was therefore tried to
observe closely the configuration of binder latex in coating
layer. The inorganic pigments, which constitute a large portion
of coating layer, were dissolved and removed by using hydrochloric
acid and hydrogen fluoride acid. By taking this process, the
configuration of binder latex in coating layer could be observed
directly, without unnecessary effect of pigments. Electron Probe
Micro Analysis showed that there was no residual pigment in coating
layer (after the process above). Upon preparing samples for cross-section
observation, Focused Ion Beam equipment and Cryo-ultramicrotome
were used, to decrease the risk of damaging binder-latex’s configuration.
This observation demonstrated that binder latex form three-dimensional
network structure, holding the pigments inside of the coating
layer. Using Cryo-ultramicrotome, an ultra-thin film of the coating
layer was also prepared from the cross-section, and observed
through Transmission Electron Microscope(TEM). Furthermore, the
application of this cross-sectional observation technique to
commercial double-coated paper is presented in this paper.
Method of Pest Control in Food and Medicine Factory
Ikari Institute of Applied Biology, IKARI CORPORATION
In Food and Medicine Factory, There are four major factors of pest control.
These factors are the following, reinforce the structure for
pest control, maintenance the structure, monitoring pests, and
extermination of pests. And more important thing is that those
factors should be carried out in PDCA cycle.
The Renewal of Electrical Equipments for Paper Industries
and Saving Energy
Industrial Systems Engineering Department,
Toshiba GE Automation Systems Corporation
The first installation of the sectional drive system of a paper machine
by Toshiba was in the year of 1951.And then the DC drive system
of thyristor Leonard had been applied to the drive system of
the paper machine. And the sectional drive system has been developed
dramatically to the fully digital controlled AC drives systems
today. The latest system has the great advantage to the conventional
systems, but the renewal to the latest system from the existing
system have not frequently occurred due to the restriction of
the period of shutdown, the initial cost of renewal, and other
factors. Actually the existing system automatically have been
getting old and old, so the reliability of the equipments have
been getting poor and poor.
In order to recover the reliability, the drive equipments should
be renewed. If the equipments are not renewed, many problems
would appear. The spare parts of the equipments may not be manufactured
any more, and the number of technicians who can handle the equipments
is getting smaller, and the down time of the paper machine may
cause the reduction of the production of paper. The predictive
maintenance and renewal of the equipments should be usually planed.
It is not easy to renew the existing equipments at one time,
so the gradual renewal should be considered with paying attention
to the hybrid system.
This article explains the points to be considered at the renewal
of the drive systems for paper industries and the saving energy
by applying the medium voltage inverter to fans and pumps with
the merit of the inverter.
SPM Shock Pulse Method for Diagnostic System of Rotating Roll Bearing
Nomura Shoji Co., Ltd.
Roll bearings are commonly used in rotating machines, and vibration method
is often employed for monitoring condition of roll bearings.
Though vibration method needs high skill and long time to compare
abnormal condition to normal one, diagnostic result is not enough
to obtain real condition of roll bearings. Shock pulse method
, SPM, was developed in 1969 in Sweden with further innovation
till today, and is now world widely accepted philosophy for condition
monitoring of roll bearings and machine maintenance.
SPM diagnostics reports not only condition of rotating roll bearings but
also thickness of lubricating oil, that helps maintenance staff
to know proper lubrication for getting longer life of roll bearings
and for performing effective preventive maintenance in proper
Trend in Mechanical Seal Technology in Pulp and Paper Plant−Mechanical Seal for Slurry Liquid Application−
EAGLE INDUSTRY Co., Ltd., Seal Engineering Dept.
In a pulp and paper plant, a large number of water pumps and various different
pumps for pulp or chemicals are utilized in the production processes
from economical point of view (energy saving, resource saving
and maintenance saving) and environment preservation point of
view. Mechanical Seals are also utilized for other rotating equipment
including agitators, screens and refineries. This text describes
Mechanical Seals which are utilized for a lot of slurry pumps
and mills in a pulp and paper plant.
BTF Dilution Headbox System−Application Report on BTF Dilution System−
Design Section, Kawanoe Zoki Co., Ltd.
BTF system has been installed on more than 100 machines in Europe, the USA
on grades from Kraft board to lightweight tissue and furnishes from ground wood to cotton liners, at machine speeds from 15m/min to 1200 m/min. Many of these installations are central distributor or dilution control retrofits to existing head boxes, while others are complete systems including a new head box. Retrofits have been made to existing head boxes from more than a dozen different suppliers, on roll head boxes as well as hydraulic head boxes. Central distributor systems and dilution control systems have also been installed on cylinder machines with open vats, and on multi-ply board formers.
The Effect of Mill Closure on Properties of Mechanical Fines
Yasuyuki Kamijo and Takanori Miyanishi
Pulp & Paper Research Laboratory, Nippon Paper Industries Co., Ltd.
The effect of dissoloved and colloidal substances (DCS) in TMP (thermomechanical
pulp) white water on the strength properties of handsheets and
the flocculation capability of fines with retention aids were investigated.
For this experiment, two types of fines were prepared. One is water-washed
TMP fines and the other is white-water TMP fines which were fractionated
with TMP white water. Breaking length and surface strength of the
handsheets containing water-washed TMP fines were higher than that
of the handsheets containing white water TMP fines. It is suggested
that DCS adsorbed on white water TMP fines had a detrimental influence
on fiber bonding.
The extent of flocculation of fines in the white water of a newsprint machine
was measured by Photometric Dispersion Analyzer (PDA). The results
of flocculation experiments showed that fines extracted with acetone
were more easily flocculated with cationic retention aids than
fines in white water. The molecular weight of retention aids affected
the flocculation of the fines in white water.
It is concluded that DCS has negative effects on sheet strength and on the
flocculation of fines with retention aids.
Keywords: thermomechanical pulp, fines, dissolved and colloidal substances (DCS), sheet strength, flocculation
Manufacturing of Magnetic Papermaking Fibers and Paper(Part II) −Preparation of Ferrite-Loaded Pulps at their Lumen by in situ Synthesis*−
Paper Industrial Research Institute of Ehime Prefecture
Magnetic pulps loaded with ferrite (M2+OFe3+2O3) in the pulp lumen were prepared
by in situ synthesis. First the basic conditions for preparation
of manganese-ferrite, zinc-ferrite and manganese-zinc-ferrite by
in situ synthesis were clarified; alkali was added to a pulp suspension
containing ferrous salt and divalent metal ion, followed by oxidization
of the pulp suspension through air-bubbling at temperature lower
than 100°C. The amount of divalent metal ion added was stoichiometrically
controlled for co-precipitation of the ferrite. New procedures
to prepare ferrite-loaded pulps at their lumen were then developed
on the basis of the obtained conditions.
Manganese-ferrite was formed at temperature of more than 50°C, 60°C and 80°C,
when the equivalent value of the alkali added was about 1.0, 1.5
and 2.0 times, respectively, as much as that of the ferrous salt
present in the pulp suspension. Meanwhile, zinc-ferrite and manganese-zinc-ferrite
were formed in a narrow range of the alkali addition level at temperature
of more than 50°C, where the equivalent value of the alkali required
was approximately 1.0-1.1 times as much as that of ferrous ion.
The contents of manganese-ferrite, zinc-ferrite and manganese-zinc-ferrite
in the loaded pulps were 30.9±2 wt%, 32.4±2 wt% and 36.2±2 wt%,
respectively. These contents were close to or slightly higher than
that of magnetite-loaded pulps reported in our previous paper.
The lumen-loaded pulp with 30.9% manganese-ferrite content had
saturation magnetization, remnant magnetization and coercive force
values of 15.8 emu/g (based on the manganese-ferrite-loaded pulp),
3.2 emu/g and 107 Oe, respectively. On the other hand, the lumen-loaded
pulp with 36.2% manganese-zinc-ferrite content had the corresponding
values of 21.4 emu/g, 4.7 emu/g and 119 Oe, respectively.
Keywords: Magnetic paper making pulp, Ferrite lumen-loading, Pulp lumen, in situ synthesis, Ferrite, Manganese-ferrite, Zinc-ferrite, Manganese-zinc-ferrite