JOURNAL January 2005
January 2005 Abstracts
Dirt Check on Pulping Process
- Dirt Control by Measuring It with "Dirt Counter" -
OMRON Corporation IT Solution Div., Web Inspection Group
Dirt in the material of paper has been measured by checking dirt
in the sample sheet that is made only for checking dirt.
By this way, the feedback timing is very late and also, it is very troublesome
to make sample sheet, out of process.
Dirt Counter solved these problems by checking dirt directly in the slurry
on the process. It is quite effective and convenient equipment, not only for
DIP, but also for general KP.
The Development of the Polymer Rolls for Calender Machines
Atsuo Watanabe and Kenjiro Nakayama
We have been developing and selling polymer rolls for various calender
machines (SC, SNC and On machine multi- nip calendar) from 1987.
We faced many problems from start such as “heat spots”“crack
so on. For the counter-measure we improved both of cover materials
and the adhesive strength, and decreased the inner stress of roll-covers
fixed on steel cores.
On this paper we report the outline of the improvement and it’s results.
Operating Experience of Acid Treatment and Ozone ECF Bleaching
Yatsushiro Mill, Nippon Paper Industries
Kraft pulp section of Yatsushiro mill consists of two fiber lines
and both lines were converted to ECF bleaching sequence in 2003.
Medium consistency ozone bleaching with an acid treatment (A stage)
prior to ozone bleaching stage was introduced to the fiber line #2
for hardwood. This A stage is the first commercial application in
Japan to prevent diffuser washer from scaling.
This report shows the mill experience of A stage and Ozone ECF bleaching.
Operating Experience of KURE 5 Paper Machine
KURE Mill, OJI Paper Co., Ltd.
No.5 Paper machine at KURE mill, OJI Paper, which has been started
operation as a fine paper machine in 1989, also now products LWC
paper in response to the market changes. This machine was designated
as the“model machine”in our company and we set up a project
team to go about increase of productivity. As a practical measure,
for the purpose of reducing deposits and web breaks, several equipment
This article introduces the experience of operating these equipment.
Operating Experience of MJ Turn Bar
Keiichi Sato, Kunio Kazama and Shigeharu Yamahata
Hachinohe Mill, Mitsubishi Paper Mills Limited
Since NO.7 PM (Paper Machine) of Hachinohe Mill, Mitsubishi Paper
Mills Ltd. began production in 1997, many kinds of paper products
have been manufactured. Especially, woodfree light weight coated
paper has such a good quality that the production of woodfree light
weight coated paper is dramatically increasing. While we tried to
speed up NO.7 PM in order to increase the production, we got a serious
problem (release problem) which occurred at the release point of
coated paper from the Symsizer® application roll. The release
problem caused the unevenness of coated layer and prevented to increase
the machine speed.
At last we decided to install “MJ Turn Bar®”to NO.7 PM in order to
improve the problem. Then it was already introduced on October 2003 and it's
been working well. “MJ Turn Bar®”could make web releasing stability
at the release point from the application roll and enable us to increase the
In this paper we report about our operating experience of “MJ Turn Bar®”that
enabled us not only to keep the quality of woodfree light weight coated paper
but also to increase the productivity.
Influence of Molecular Orientation on the Curling Phenomenon in Laminated Films
- A Curl Control Method of "Communication Paper" -
Advanced Technology Research Laboratory, Oji paper Co., Ltd.
Recently, plastic films have been widely applied to manufacture "communication
paper", such as direct thermal films (or paper) and dye diffusion
thermal transfer sheets. In these applications, the biaxially drawn
films are used, and their molecular chain orientation causes "curl
phenomena", particularly in laminated films.
We found that the curl-value (∆K) of plastic films clearly related to
the difference of the thermal expansion coefficients of each ply in laminated
films, and the thermal expansion coefficient could be predicted by measuring
the degree of molecular chain orientation (MOR-value) determined by the transmitted
microwave intensity method.
Based on these findings, we propose that quantitative curl prediction is possible
by employing an approximate formula derived from the lamination theory.
Development and Future of Waterproof Laminated Paper Oper”Senzo Yamaguchi
Komatushima mill, Nippon Paper Industries Co., Ltd.
“Oper”which is a waterproof laminated paper, has been
made by Nippon Paper Industries since 1988.“Oper”maintains
the same characteristics as general papers, like “softness “printability””onvertibility”Now
it is widely used in a commercial printing business and in a converted
At the early stage of development, “Oper”had some problems in quality,
which were caused by the effect of roughness and moisture of base paper onto
the surface morphology of laminate layers. We report here how we coped with
We also report the development of our new products, “The Poster”and “Oper
MDP”"The Poster”which is the product mainly used for posters,
has improved ink drying property which was the strongly required property by
a market. And “Oper MDP”was developed for full-color laser beam
printer, which is one of the on-demand printing field which is remarkable growth
field in recent years.
And we introduce our latest consideration to the environment.
Paper Pulp Raw Material Supply in the Future
- Research on Improvement of Production and Quality of Wood Biomass -
Forestry Research Institute, Oji Paper Co., Ltd.
The supply of raw materials is a business base of the paper manufacture
industry. It is necessary to aim at a production increase and a qualitative
improvement of the wood biomass by the expansion of the afforestation
area in the stable supply of the raw materials. Securing a suitable
afforestation area will be expected to become difficult by the competition
with the farmland acquisition that originates in the food problem.
As a result, afforestation in a very bad environment with various
environmental stresses is not avoided.
Oji Paper succeeded in the creation of an environmental stress resistant eucalyptus
by using our original genetically modified technology. In addition, the genetic
information database of the eucalyptus was as also constructed for the improving
of the wood biomass. The wood formation mechanism of the eucalyptus is clarified,
and it will aim at practical use for efficient production of the wood biomasses
along with the stress tolerance in the future.
As a result, stable production of the wood biomasses becomes possible, and
use as the recyclable resource for the wood biomass not to mention the paper
pulp raw material to replace the fossil resource such as oil can be accelerated.
In addition, it is expected that large-scale afforestation of the eucalyptus
that has high carbon dioxide fixation ability becomes possible, and it contributes
to the carbon dioxide absorption for the global warming prevention greatly.
Operational Experience of Power Boiler for PS Incineration
Nippon Daishowa Paperboard Tohoku Co., LTD.
Since paper sludge (PS) generated in paper manufacturing has high
water content and low calorific value, its utilization as heat source
is not popular. On the other hand, waste tire is utilized partly
only because reuse is restricted by particular application due to
difficulty in treatment of wire contained in tire. Recently, treatment
of waste tire becomes an issue of waste materials.
Incineration PS together with waste tire, but without auxiliary fuel (fossil
fuel) support, has been satisfied. The incineration boiler can produce high
temperature and high-pressure steam, and generate electric power of 14,000
kW in stable operation. Thus it contributes to resource and energy conservations,
reduction of wastes and consequently utilization of wastes.
The incineration boiler was put in commercial operation since October 2003.
Experience and establishment of the plant operation with regard to reduction
of dioxin emission controlled by combustion temperature, turbine load control
performed remarkably in the waste incineration boiler and maintaining the plant
in stable and safe operation are described.
Operating Experiences of CL&K Removal System Using Ion-exchange Resin
- Chloride Ion & Potassium Ion Actual Operation Report of Removal System
for Solution of
Electrical Precipitator Ash at Recovery Boiler -
Niigata Mill, Hokuetsu Paper Mills, Ltd.
In the process of Kraft Chemical Recovery Cycle, Chloride (CL) and
Potassium (K) entering with raw-material wood chip are gradually
accumulated and concentrated during continuous operation. The plugging
issue of carryover particles and dust in the Recovery Boiler is caused
by decreasing melting temperature of dust along with increasing concentration
of CL and K in the Black Liquor.
At the same time, fouling and corrosion at the super heater of Recovery Boiler
is apprehended. To avoid above problem, proper portion of recovered Electrical
Precipitator Ash was deserted from recovery cycle. In this manuscript, actual
operation data from CL&K Removal System using Ion-exchange Resin developed
and installed at Niigata Mill are introduced.
Operating Experience of RPF Boiler at Tomakomai Mill
Tomakomai Mill, Oji Paper Co., Ltd.
Tomakomai mill, Oji Paper Co.,Ltd., has contributed to the cultural
and economical development of Japan as the most important mill in
Oji Paper since the establishment in 1910.
Today, Tomakomai mill is the largest newsprint mill in the world and continues
to fulfill the obligation to provide stable supplies to the customers.
Oji Paper established the Environment Charter and is pledged to make further
efforts to reduce its consumption of fossil fuel by promoting thermal recycling
in which collected used paper and plastics which cannot be recycled are incinerated
In order to implement the plan, Oji Paper has installed a circulating fluidized
bed boiler (CFB) at Tomakomai mill. It is the first high temperature and pressure
boiler in the world, which uses RPF as the main fuel.
In this paper, the abstract of the RPF boiler is introduced and the operating
experience is reported.
The Advanced Information System for Paper Roll Handling
Kushiro Mill, Nippon Paper Industries Co., Ltd.
This paper describes the modifications incorporated in the information
system for the existing paper roll handling process. In order to
share production, marketing and inventory information between the
headquarters and each domestic mill, the paper roll tracking system
was replaced in Kushiro Mill. Since the previous system lacked memory,
communication bandwidth and expansion capacity, new PC system was
introduced. It has successfully consolidated various products information
into single database. The next phase which is to expand this service
to each department by constructing company-wide LAN, has been introduced
for two years, and promotes the new system capability to the headquarters.