JAPAN TAPPI JOURNALVol. 57, No.8
August 2003 Abstracts
Total Automation System for Paper Making Plant
Yaskawa Siemens Automation & Drives Corp. System design group
"Open Networks", "Multimedia", "IT", all these
are keywords to describe the recent trends in the automation of production
facilities, which have provided for a more centralized management of complete
plants. In the paper industry, Distributed Control Systems (DCS), Quality Control
Systems (QCS), Drive Systems, and Maintenance Management Systems, are widely
used, each of these being delivered by specialized vendors.
This multitude of systems with different hardware, software and diverse engineering
tools constrict the efficient use of resources in running a paper plant.
Siemens demonstrated a way to solve these issues by providing a complete automation
system based on a unified hardware base and only one kind of HMI. Yaskawa Siemens
has developed technologies to support maintenance and diagnosis of equipment
in the paper industry by remote monitoring systems via telephone or ADSL-connection.
Operating Results of New TWINDRUMTM Pulping Concept at SP Newsprint Co., Newberg, Oregon
Engineering & Development Division, Voith IHI Paper technology Co., Ltd.
In 2000, an order was placed by SP Newsprint to replace their wash deinking
process with a state of the art deinking line. VOITH PAPER supplied
the entire scope of equipment needed for the rebuild. The plant
is designed to produce 550 BDMTPD of finished pulp. The raw material
is made up of 80% old newsprint and 20% old magazine. The system
was successfully started up in September 2001.
A key role within the recycled fiber plant is attributed to the
pulping stage. The pulping stage initiates the recycling process.
Goals are to disintegrate the paper, without damaging the fiber
and to release the printing ink and coating from the fiber surfaces.
Another important requirement is that paper impurities remain as
large as possible in size to facilitate an effective and early
removal. The pulping module installed at SP Newsprint meets all
those requirements by utilizing the new TwinDrum? drum pulper concept.
Application of OptiDwell Shoe Nip Calender
Matti Lares, Stefan Kuni and Martti Tuomist
Metso Paper Inc.
Metso Paper KK
Metso Paper has developed OptiDwell shoe nip calender which enables achievement
of long dwell time, reduction of compression pressure and coutour
calendering with extremely soft belt. This technology is based
on Valmet shoe press and soft calender technologies. The first
OptiDwell was started up to produce coated liquid packaging boards
and coated white top liner boards at Korsnas PM5 in Sweden in 1994.
Bulk saving and improvement of surface qualities of boards were
easily achieved with OptiDwell. The second OptiDwell was started
up at Korsnas PM4 in 2000. Two other OptiDwell were also delivered
to other customers and started up.
Metso paper has studied various kinds of applications of OptiDwell.
OptiDwell is applicable not only for a final calender but also
for a precalender. Pilot test results proved the effectiveness
of new application of OptiDwell as a precalender for high-quality
A New Pulping Method for Non-wood Resources for the Purpose of Lightening the Loading to Environment
Kyoji Suzuki and Kayoko Hoshino
Tetsuo Ide, Takefumi Ide, Kiyoshi Yoda and Tsutomu Hiyoshi
Taizen Co., Ltd
The soft pressure type kneading machine(New Taizen) which has been used as
useful deinking machine was attempted to use as a new instrument
for the pulping of non-wood resources. This new pulping method
is expected to lighten the loading to environment in comparison
with traditional alkaline chemical pulping. We applied it to the
It was revealed that this new pulping method is hopeful for the straws, especially
for a rice straw. Although some shives (fiber bundles) were found
in the treated pulp, they may be separated into individual fibers
by subsequent refining and bleaching or by higher alkali addition.
High Density & Continuous Pulping "KNEADINGPULPER"
Industrial Machinery Dept, Nippon Sharyo Co., Ltd.
The quality deterioration of raw materials caused by a rise of used paper
recycling rate brings about new problems that its processing plant
becomes complicated and its energy consumption increases. "How
should an environmentally friendly pulper be?" we approached
the essence of pulping and have developed the high density and
continuous pulping "KNEADINGPULPER" which assures an
excellent recycling performance of used paper. The equipment consists
of a long cylindrical tab and a multistage rotor provided in it.
Raw materials supplied from its top are pulped with a high density
while they are descending. They are kneaded to disperse printing
ink at the lower part and continuously discharged through a screw
feeder. The equipment could have following advantages, because
of "Lower kneading speed" and "No vertical circulation
of raw materials", which are not in the past.
Charge Management through Process Analyzers
Jukka Nokelainen and Takeshi Sato
Metoso Automation, Field Systems Division
Modern automation solutions for papermaking wet end is a nice example how
to utilize process analyzer as part of the machine controls. By
wet end management we aim to have stable total and ash consistencies,
drainage properties of the headbox suspension, and basic chemistry
in paper machine short circulation. Stability is very important,
because it´s directly connected to paper machine runnability as
well as to quality of produced paper. The level and variation of
charge have a considerable effect on process status and operation.
On-line charge measurement provides valuable information about
the wet end chemistry of the paper machine. It is possible to perform
charge contgrol based on measurement by charge analyzer kajaaniCATi.
The control provides many benefits for the papermaker. The benefits
are process information, stability of process, runnability of papermachine
and economical and effective use of chemicals.
Advantages of Commercial Rutile Titanium Dioxide Slurry for Paper Applications
DuPont Titanium Technologies
DuPont Kabushiki Kaisha
Paper mills have used titanium dioxide to generate opacity in high quality
paper and paperboard for many years. Dry anatase pigments were
used at first since this was the only technology available. Invention
of the chloride rutile process created opportunities for new levels
of performance in the paper industry. Commercial rutile slurry
was introduced over 25 years ago to the North American market and
has been continually improved. Over 95% of the titanium dioxide
used in this market is commercial slurry. More recently the use
of stable paper slurries has been growing in both Europe and Japan.
Commercial rutile slurry offers performance advantages over slurry produced
by the paper mill. High shear dispersion equipment allows optimization
of the particle size and increased light scattering. Opacity gains
of 10-12% have been demonstrated in the lab. Mill trials have confirmed
even higher performance gains.
Anatase pigments have a lower refractive index and generally larger particle
size. Both attributes will contribute to lower scattering performance
than a rutile pigment. Mill trials have demonstrated over 20% reduction
in pigment use when switching from an anatase pigment to rutile.
Handling and storage of slurry products is not difficult. Proper design of
the equipment will insure trouble free operation and high product
quality. Correct addition to the paper process will maintain the
high performance of the pigment.
Function Enhancement of the Paper by Surface Sizing Agents and the Mechanism
Harima Chemicals, Inc.
Surface treatment technology is one of the important roles to control the
quality of paper in papermaking process. Particularly, surface
sizing agents have performances not only to improve printability
and water resistance but also to enhance surface strength of paper.
In addition, it is possible to reduce cost of total paper chemical
additives by using surface sizing agent. Since ink jet printability,
for example, feathering, print through and others, on DIP-contained
PPC has been increasingly required in the recent, it is expected
to develop more effective surface sizing agents. On the other hand,
stability and solubility of surface sizing agent in coating solution
and low foaming in the papermaking process are required to use
surface sizing agent with starch or others at high temperature.
We have studied regarding printability on PPC and peel test on newsprint,
and measured the dynamic properties by dynamic liquid penetration
measurement and dynamic absorption tester on the sized papers with
internal and surface sizing agents. Thus, this paper describes
the consequences of the relationship among them.
A Study on Blistering Resistance with Acceleration of Air Permeability (II)
Nobuhiro Matsuda, Shigeo Yamanaka, Masaaki Yada and Yoshiaki Zama
Polymer Research Laboratories, JSR Corporation
The blister of coated paper that is caused by rising water vapor pressure
is a problem in web-offset printing. However accurate experimental
determination of the blistering resistance is very difficult. Many
commonly used laboratory methods do not correlate to real press
experience, and it is very expensive to use commercial press trials
for testing purposes. Therefore, predicting the blistering tendency
of coated paper is very important.
In the previous report, we reported that we developed our original air permeability
tester with which we could measure the acceleration of the air
permeability (AAP) of coated paper under high temperatures and
high pressures during a short time. And we found that AAP was strongly
related to the blistering tendency of coated paper.
In this paper, we used various commercial A2 web-offset coated papers made
in Japan, and studied on the blistering resistance. Then we found
that the internal bond of base paper and AAP that had a direction
from base paper layer to coating layer, were strongly related to
the blistering tendency.
Keywords : Acceleration of air permeability, Air permeability, Internal bond, Blistering,Coated paper
Development Both Higher Opacity and Sheet Gloss GCC- Introduction of the FMT-OP Series -
Recent trends have shown that the demands for Ground Calcium Carbonates (GCC)
for paper coating are steadily increasing. Among the diverse property
demands of GCC, increased Opacity and Sheet Gloss demands come
to the forefront. FIMATEC, a GCC manufacturer, has previously developed
SC-95(a particle size distribution controlled GCC). SC-95 has shown
excellent properties in both gloss and picking resistance. However,
SC-95 is designed for medium-fine to medium particle size and therefore
cannot further improve sheet gloss properties.
Using SC-95 technology as a base, FIMATEC now introduces the newest
development in particle size distribution manipulation in the new
OP-Series. The OP-Series is specifically designed for medium to
fine particle sizes which improves sheet gloss. Other beneficial
qualities include: improved Wet Void Volume %.
Comparison properties of OP and SC series products are shown in
the following report. All in all, OP-Series Test results show improved
Sheet Gloss and Opacity characteristics .
Exact Sheet Counting and New Laser Ream Marking System
Maruishi Co., Ltd., Engineering Dept.
Newly developed sheet counting device and ream laser marking system are developed
by Function Control Research B.V. These devices are very suitable
to count the number of paper and board sheet which are piled on
a pallet coming from sheeter. Conventional tape inserter for every
ream in the skid can be eliminated.
Exact sheet counting system can give many advantage for the industry.
This sheet counting system with ream laser marking system has been
working over 1.5 years in commercial operation, and it is a first
experience in the world.
Pest Control Activities for Quality Assurance
Earth Environmental Service Co., Research & Development
Contamination control-not only insect contaminant is one of the important
activities for quality assurance (QA) of the product and it should
be based on the preventive approach. In order to realize the effective
prevention of insect contamination in the factories, we must establish
the comprehensive system including hardware, software, and human-ware,
which can solve the basic cause of contamination.
We have been introduced the tailor-made comprehensive system against contamination
to the wide variety of customer factories, which we call THC (Total
Health Care) system. The framework of our THC system is as follows.
After the annual program, we grasp an inadequacy by periodical
on-site surveillance including visual inspection, sampling, monitoring,
etc. Then we analyze the results of surveillance using statistical
methods to decide the optimal action plan solving problems both
existing and potential. The short-term action plan, which basically
consists of hardware, software, and human-ware, is examined by
the group discussion among factory member and us. Once the plan
is accepted, we make it clear that whose responsibility, when/by
when and where to execute, how to proceed, and why in order to
make sure the plan into execution. After verification of execution,
we validate the effectiveness of the plan by the close examination
using statistical method. If the plan is ineffective, we refine
the plan or adopt the alternative one. At least twice a year, we
review and validate the annual program by the general statistical
analysis because we must make the annual program more effective
for the successive year. Continuous improvement of the comprehensive
system can make the contamination control more and more effective
year by year and our THC system enables it. In this paper we will
explain the concept and procedure of our system in detail.
Web Inspection System "SmartView ICN"
COGNEX K. K., Surface Inspection System Division
COGNEX developed a new web inspection system, "SmatView ICN". This
system has following 3 advanced technologies. (1) Superior Defect Detection
using digital cameras and parallel processing, (2) Reliable Defect Identification
by over 40 defect features, (3) Unequaled Visualization. It has also snapshot
function for web formation analysis.
Acoustic Emission during the Tensile Straining of Paper from Hardwood Pulp-Effects
of Beating and Addition of Dry Strength Resin-
Tatsuo Yamauchi and Takateru Hatanaka*
Graduate school of Agriculture, Kyoto University
Acoustic emission (AE) that occurred during tensile straining of paper from
hardwood pulp with and without dry strength resin was measured
and analysed to investigate the process and mechanism of tensile
deformation up to maximum load. Maximum amplitude distribution
of the AEs that occurred during the straining manifested some changes
of micro failures with increases in beating degree and addtion
level of dry strength resin. The increase in bonding area by beating
and increase in specific bonding strength by addition of the resin
cause an increase in failure of strong fiber bonds. Although almost
all of micro failures that occurred during the straining up to
maximum load are attributed to those of weak fiber bonds, some
strong fiber bonds and/or fibers themselves fail just before maximum
load for the handsheets from beaten pulp. With addition of the
resin, strong fiber bonds and fibers themselves begin to fail even
in mid of the plastic deformation.
Keywords: Acoustic emission, Beating, Dry strength agents, Hardwood pulp, Tensile strength
Life Cycle Impact Assessment of Woodfree Papers Containing
Nonwood Pulp or Deinked Pulp
Japan Science and Technology Corporation
Graduate School of Engineering, University of Tokyo
Mitsubishi Paper Mills, Ltd.
Graduate School of Engineering, Tokai University
Center for Collaborative Research, University of Tokyo
Institute of Industrial Science, University of Tokyo
Life cycle impact assessment for woodfree papers containing nonwood pulp (bagasse
pulp and kenaf pulp) or deinked pulp (DIP) was investigated by
eight kinds of environmental impact methods such as EPS1992, EPS2000,
Eco-Point1993, Eco-Point1997, Eco-Indicator95, Eco-Indicator99,
Panel method and Distance to Target method, based on the results
of LCI (Life Cycle Inventory) analysis.
Considering the environmental impact caused by CO2 emission from biomass,
the environmental impact of woodfree paper containing DIP was smaller
than that of other kinds of woodfree paper. Not considering the
environmental impact caused by CO2 emission from biomass, the environmental
impact of woodfree paper made from 100% wood pulp was smaller than
that of woodfree paper containing DIP except Eco-Indicator99. It
was evaluated by eight kinds of environmental impact methods that
the environmental impact of woodfree paper containing kenaf pulp
was the largest in four kinds of woodfree paper. In the comparison
of the environmental impacts calculated by eight kinds of environmental
impact methods for four kinds of woodfree paper, the ratio of total
environmental impact of the kenaf pulp and DIP was less than 1.8
in seven kinds of environmental impact methods except Eco-Indicator99.
It was confirmed that the environmental impact caused by CO2 emission
was evaluated larger than that caused by other substances in eight
kinds of environmental impact methods, especially accounting for
about 70% in six environmental impact methods except Eco-Point1993
Keywords：Life cycle impact assessment, Woodfree paper, Bagasse pulp, Kenaf pulp, Deinked pulp