|JAPAN TAPPI JOURNAL Vol.61
November 2007 Abstracts
The Newest Finishing Equipment
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
Hokuetsu Kamiseisen Co., Ltd.
This is the following report that was told as “The
Approach for No Manual Sorting System - The labor-saving history
in sheet finishing process” at Japan TAPPI Annual Meeting in 2006.
The previous report dealt with paper finishing without resorting
based on “the quality verification activity”. 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
Metso Paper Japan Co., Ltd.
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
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
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 -
DIENES JAPAN (at Mack3 Enterprise, Inc.)
Slitting technology has been subject to rapid developments
in recent years. With today’s 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
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
Operating Experience of New Slitting System at PM7 Winder
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
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
Surface Inspection Systems Division, COGNEX K.K.
Cognex developed “SmartLearnR”, 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 “AWA (Advanced Winder Advisor)” 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
Nippon Paper Industries Co., Ltd., Pulp & Paper Research Laboratory
Oji Paper Co., Ltd., Pulp & Paper Research Laboratory
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
Nippon Paper Industries, Co., Ltd., Ishinomaki Mill
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
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,
Influence of Cooking Conditions on Pulp Properties of Acacia auriculiformis in
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
Multiple non-linear regression, Pulp properties