|2009 February JAPAN TAPPI JOURNAL|
Vol.63 No.2 Abstracts
-To Improve Quality, Performance and Efficiency on
Metso Paper Inc.
Metso Paper Japan Co., Ltd.
A modern stock preparation system strives toward
good end product quality, improved papermaking line
runnability and efficiency, both in terms of production
Wet end chemistry strongly influences the production
efficiency and profitability of paper and board making,
and thus represents a considerable part of operating
costs. Stability forms the basis for quality and
runnability while flexibility contributes the most
to efficiency. The best solution cannot only be found
through sub-process optimization but through sufficiently
broad process integration.
The majority of stock preparation and approach
systems are still based on conventional technology
where large volumes, log delays and instability problems
prevail. But these systems have some major drawbacks,
such as the uncontrollability of separate dead volumes
in tanks. Immediate problems with these systems include
instability, such as consistency variations, stock
and filler proportioning and the extended time required
for grade changes.
OptiFeed is a streamlined, single platform concept
where automation and process design complement each
other. The idea is to make stock processing stable
and flexible, thus enabling improved production line
quality and efficiency compared to conventional wet
end management systems. Well engineered components
and optimally dimensioned process-not too big, not
too small-saves energy and prevents consistency deviations
as well as pulsation. The OptiFeed system integrates
separate key elements of the mill area in a unified
high-efficiency concept, applicable to the entire
stock preparation system or to approach flow system
alone or components within it.
This paper will present the implementation and
benefits of the OptiFeed system in approach flow
system management. The focus will be on deaeration
and mixing processes, and automation solutions.
New Chemical Mixing Method after Machine Screen with
WETEND Technologies Ltd.
A new innovation, developed TrumpJet Technology
is used to inject papermaking chemicals efficiently
into headbox stock. The mixing is greatly improved
and consumption of chemical is reduced. The injection
liquid is circulated headbox stock or white water
instead of fresh water. Several installations operate
with good results and improved quality of production.
Cost Saving Case Study by Installing New TrumpJetTM
Chemicals Mixing System
Hachinohe Mill, Mitsubishi Paper Mills Limited
We have tackled ‘Optimization of wet-end’ at No.7
paper machine (7PM) in Hachinohe mill since 2005
spring. In this paper, we introduced the cost saving
case study of a 35% reduction in retention aids and
expanding wire and felt lives by the improvement
in retention by installing New TrumpjetTM chemicals
mixing system to a retention aid. Additionally other
new installed plan was also described.
The Recent Technology for Elimination of Pitch Trouble
by Using the Organic Polymer Coagulants
Hidetoshi Sakamoto and Kenji Sakai
Shonan Research Center, HYMO Corporation
In this report, we introduce the recent methods
of our pitch analysis: “micro-pitch image analyzer
system” and “stickies image analyzer system”, and
the recent investigation of the use of Cationic Polymer
Cationic Polymer Coagulants prevent growth of the
micro-pitch and fix them onto pulp fibers.
We found some of the coagulants have an ability to
decrease adhesive property from the surface of the
micro stickies particle or large size stickies.
The coagulants showed different characteristics in
adsorption onto the micro-stickies particles, and
the most effective coagulant should be selected depend
on addition point in paper making process.
Operating Experience of Stock Preparation for Paperboard
Soka Mill, Nippon Daishowa Paperboard Co., Ltd.
In a recent global environmental protection tendency,
the energy-savings are one of the most effective
subjects, which simultaneously can reduce cost under
the extraordinary oil price increase circumstances.
In the board mill, pulpers and refiners are known
as high energy consuming equipments in the recycled
pulping and the stock preparation process. This paper
describes our recent operation experiences of high
efficiency refiners replaced which successfully reduced
power consumption in the stock preparation process.
Operating Experience of Mishima PM N10
Mishima Mill, Daio Paper Corporation
8 percent of the coated paper demand in Japan is
cost competitive paper which is produced with the
latest production lines in China and Europe. And,
Japanese LWC market is shifting to lighter weight
products. We have built our N10 paper machine at
Mishima Mill in order to have advantages in quality
and cost against imported paper, and to meet the
demand for lighter weight paper. N10 machine has
both blade coater and roll coater to switch the coating
process depending on paper grade. And it also has
on-line multi-nip calender. It is the first on-line
blade coater for us.
We had some troubles caused by many interlocks
for automatic systems. However, we didn't have serious
operation or mechanical troubles which we had worried
about, such as threading and start coating at coating
section at high speed, gloss appearance with multi-nip
calendar, and roll damage at online multi-nip calender.
Now it runs very well.
Since N10 machine is a new type of machine which
has gapformer with forming suction roll, press section
equipped with transfer belt, we had been worried
about sheet formation and two-sideness. We have got
planned quality of paper. And we have produced LWC
which has enough stiffness we planned, by coating
at roll coater after starch is coated at size press
Operating Experience of Ishinomaki PM N6
Ishinomaki Mill, Nippon Paper Industries Co., Ltd.
PM N6 in Ishinomaki Mill has been in operation
since November 1, 2007, and it is mainly producing
MWC and LWC at 1600m/min speed. The wire width and
designed speed of PM N6 is similar to PM N2 in Yatsushiro
Mill. On-line blade coating station and hot soft
nip calender are equipped in PM N6, which are similar
to PM 9 in Iwakuni Mill. The production ability of
PM N6 is 1.5 times higher than PM 9. It is designed
for pursuing high productivity and cost competitiveness
with various latest technologies. We achieved successful
start-up by our cultivated technical knowledge and
experience of on-line coat machine and the most advanced
technology such as tandem-type 2-stacks shoe press,
This paper reports the outline and the latest operation
experience of PM N6.
Startup Progress Report of Niigata New N9 Paper Machine
No. 7 Production Department, Niigata Mill, Hokuetsu
Paper Mills, Ltd.
Focus on to the Wide width, High speed and Specialized
in A3 grade production, N9 Paper Machine which 4th
Oncoater machine in Hokuetsu Niigata mill has been
successfully progressed from Stock on Wire at the
beginning of June 2008 to On Reel, Color coating,
Gloss Calendering and Rewindering. The quality identification
and the print test for commercialization have been
done at any time, the improvement and the stabilization
of a quality have been tried on the basis of the
customer evaluation. Through N9 operation, the development
of the efficient production system including existing
three Oncoater-machines has been convinced. In this
paper, we introduce the point of machine selection,
the effect of introduction of new equipment and the
trouble cases etc.
Construction of Oji Paper TOMIOKA N-1
Technology Div., Oji Paper Co., Ltd.
TOMIOKA N-1 is the all online paper machine which
has on-machine coater and on-machine calendar. This
is under construction now in Oji Paper Tomioka mill.
Our purpose of this innovation is to increase productivity
of WFC which has growth market and to lead other
competitors globally. Oji Paper Tomioka mill was
selected for the construction site, because it has
many old machines and has some merits such as variety
of pulp, low cost of energy, and logistics matters.
On adoption of all online machines, there are many
challenges such as sheet break at blade coater, calendar
roll damage with color defects and vibration in high
speed calendaring. In order to solve these problems,
TOMIOKA N-1 has been designed with the all new concept
and latest technology.
This paper will present the outline of TOMIOKA N-1
especially the process of introduce this machine
and the concept of new design. In addition, some
troubles about construction work and latest progress
on the site will be shown.
Enhanced Paper Quality and Productivity Thanks to
ModulePro, Innovative Moisture Apply System
Voith IHI Paper Technology Co., Ltd.
When we discuss the quality of the paper, there
are key parameters. The parameter about the moisture
is important, and there is a great deal of the case
caused by moisture in the paper when problems occur
It is thought that the outstanding matters on the
moisture measurement technology were almost solved
if we watch it macroscopically because high performance
moisture sensor resisting harsh environment was developed
by the present.
But when we try to do automatic moisture control
and absolutely need reliable moisture apply system
as an actuator which is a device for letting paper
to be absorbed from a large quantity of water to
small quantity precisely.
Voith Paper wanted to solve this issue immediately
as a total paper making process supplier, and tried
to find a solution using various conventional moisture
apply systems. However a result to be satisfied with
was not provided. Therefore Voith Paper did the test
repeatedly at his own high speed paper machine in
Heidenheim using a trial moisture apply system developed
by Voith Paper for searching true mechanism of the
water absorption into paper. Based on the result
Voith Paper has developed innovative moisture apply
By this report I introduce summary of ModulePro and
application report on an anti-curl measures, improvement
of calendering, moisture profiling results etc.
A Participation Report of the 2008 Marcus Wallenberg
Nippon Paper-Pak Co., Ltd.
The 2008 Marcus Wallenberg Prize Ceremony was held
on October 6 in Stockholm, Sweden. First, I would
like people of pulp & paper industry in Japan
to recognize the significance of the prize through
the background, as well as the great ceremony. Secondary,
I would like to encourage researchers in the Japan
and Asia region to nominate because I am invited
one of ambassadors to the Marcus Wallenberg Prize
New Automatic Control System for Fiber Orientation
and Improvement of the Quality of Copy Paper
Junji Yamamoto, Hidenobu Todoroki, Katsumasa Ono
and Takashi Ochi
Pulp and Paper Research Laboratory, Nippon Paper
Industries Co., Ltd.
Takashi Sasaki and Hirofumi Sano
P&W Solution Dept., Yokogawa Electric Corporation
A new automatic control system for fiber orientation
has been developed. In this system, the fiber orientation
on both paper surfaces is measured continuously,
and the edge flow valves and the slice lip actuators
at the headbox are manipulated automatically to minimize
the differences of orientation angles between the
felt and wire sides of paper. And the system can
also estimate the change in the basis weight profile
caused by the change of the slice lip shape, and
manipulate the dilution control valves at the headbox
to compensate the disturbance.
We confirmed the validity and stability of the system
on the actual paper machine. By this automatic control
system, the average degree of twist-curl of paper
is able to be reduced to less than half before and
it is possible to produce copy paper with low degree
of twist-curl continuously. Moreover, this system
is quite efficient to shorten the time needed for
adjusting the machine conditions to have enough quality
for the copy grades after the startup of paper machines.
This system has been installed in an actual paper
machine and has been effectively controlling the
twist-curl of copy paper since the beginning of 2007.
Keywords: automatic control system, fiber orientation,
headbox, copy paper, twist-curl