Hiroshima Research and Development Center, Mitsubishi
Heavy Industries, Ltd.
Objectives of this paper are to discuss newsprint
in the newspaper printing press through introducing the structure
and function of
the press, paper behavior in the press, and characteristics of newsprint.
is possible to assume paper as elastic film with variation of elastic
modulus upon water absorption through the printing process.
Surface strength must be increased to reduce piling problem while
brightness of paper must be similar among papers to be used in many
sites to keep consistent print quality across the nation. It is also
important to evaluate characteristics of paper under the condition
corresponding to the actual operation.
Advanced Forming Fabric Technologies
for Each Paper Grade
R & D Div., Nippon Filcon Co., Ltd.
According to our market research
in Japan, while the forming fabric market has been shrinking annually,
the number of forming fabric
designs has been increasing every year. In this market situation,
we would like to explain what kinds of forming fabric design are
more popular for each paper grade, how they changed in comparison
with 5 years ago, what the main factors to decide the direction
of those changes are and what advanced forming fabric technologies
leading them are. Also, at the viewpoint of R&D, we would give
some suppositions regarding the trends of new forming fabric technologies
for future challenges and their solutions.
The Latest Development and Trend of Seamed Felt
Makoto Saito and
Albany Nordiskafilt KK
During the seventies, papermakers expressed
their need for a press felt with seam, to make the felt installation
easier. The reason
for this was that the development of felt with seam had moved forward
and the base weaves now contained both MD/CD with single monofilaments.
With the single monofilament base weaves, the felt construction became
stiffer and by that harder to install.
More than 20 years ago, the
dream became reality, and the first press with seam was installed
at PM9-2P in Skarblacka, Sweden, producing
a Kraftsack paper. The year was in 1982 and the trial was successful.
The rumor was spread around and its future expectation became very
positive for paper makers. The design of seamed felt was patented,
but many of the licenses were sold to interested competitors to promote
About The DOCTOR SYSTEM for Wire and Press Part
DOCTOR MFG CO., LTD.
DOCTOR SYSTEMS in recent years has turned to
DOUBLE DOCTOR SYSTEMS like DOCTOR FOR WIRE SUCTION COUCH, DOCTOR
FOR CERAMICS and so on.
COUCHDOCTOR effective to the prevention
of the occurrence of the mist and the hole obstruction and the improvement
of the water profile.
DOCTOR FOR CERAMICS is doing DOCTORING enough,
using a shower.
A big fault of all DOCTOR is Dregs stick to the reverse
side of BLADE. However, it could remove by SELF developed afresh.
use SELF CLEANING DOCTOR together with DOUBLE DOCTOR, a bigger effect
Introduction of Trinippress into Paper Machine for Corrugating
Amagasaki Mill, Rengo Co., Ltd.
Amagasaki Mill No. 8 Paper Machine
(PM No.8) of Rengo is manufacturing corrugating medium, basis weight
from 115g to 200g.
The paper machine installed in 1979. The wire part
was remodeled into Twinwire Duo Former F in 1987. As for the press
part, we had
not remodeled since the first. However, currently the press part
became too old, and February 2002 which was renewed.
the new type of press section, we mainly took into account the improvement
of runnability and energy saving by dehydrating
at the end of press part. As a result, we decided to introduce the
trinippress to the paper machine despite no performance of the introduction
in the paperboard field.
In this report, I would like to report on
the outline of the installation of trinippress and the current operating
condition of PM No. 8.
Rebuild of Headbox & Ontop-Former at No.7PM
Iwakuni Mill, Nippon Paper Industries Co., Ltd.
No.7 paper machine
at Iwakuni mill, Nippon Paper Industries, has been in operation since
1987.This machine has a 408-ton production
capacity of coatbase paper per day, and has played the core role
in our mill, the specialty being the high quality coated paper.
January, 2004, the wet section was modified in order to enhance the
sheet quality of coatbase.With this project, the Sym Flow-D headbox
with advanced dilution control system and Sym Former-MB with a loadable
blade module, being supplied by Metso-SHI Co., Ltd. allowed us to
achieve a higher level of MD and CD quality and sheet formation.
article introduces the latest operating experience, focusing on effects
of this project.
Progress of OptiConcept Paper Making Machine
Metso SHI Co., Ltd.
Since 1st OptiConcept complete news print machine
started in China, 10 complete OptiConcept machines have already started.
One of the
main targets of the OptiConcept was to combine all paper making processes
into one paper making line.
The concept was realized by development
of OptiSizer as for the coating unit and OptiLoad as for the on line
multi nip calender.
There are 4 complete LWC machines are running with this concept.
In addition to the development of all online concepts, further development
of section technology has been continued. Result of the latest development,
such as new OptiFlo headbox, OptiDry vertical dryer and OptiSpray
coating are introduced.
The Investigation of the Elution Tests of
the Fluorescent Whitening Agents Contained in the Paper Packing Container
Takashi Miyagawa, Masayuki Omatsu and Takayuki Jikibara
Analysis Center, Oji Paper Co., Ltd.
Environmental Affairs Dep., Oji Paper Co., Ltd.
We requested some
analytical organizations to carry out the fluorescent whitening agents
examination of the papers, which have possibility
to contact with foodstuffs directly. Although the examination was
performed based on the official standard method, Kansyoku No.244,
there was a considerable difference in the results obtained from
the examinations carried out by various organizations. Kansyoku No.244
examination is performed as follows.
First, the specimen is extracted
with weak alkali water. Then, the pH value of extract is adjusted
between pH3 and pH5 with diluted
HCl solution, and the gauze is dipped in the above extract. Finally,
the gauze is observed under UV lamp to judge whether fluorescent
whitening agents are extracted or not. In this investigation, it
was found that the fluorescent whitening agents efficiently stained
the gauze in strong acid water, but were little in weak acid and
alkali water and the observer’s abilities of recognizing the fluorescence
was difference, respectively.
The different results of the examinations
carried by the analytical organizations were caused by the difference
in pH, at which the gauze
was dipped in the extract, and the observer’s ability of the recognition
of the fluorescence.
The Development of MJ Former for Paperboard Grade
Mitsubishi Heavy Industries, Ltd., Paper & Printing
Hiroshi Iwata and Kazuhiko Masuda
Mitsubishi Heavy Industries, Ltd.,
Hiroshima R&D Center
Production increase and the trend toward
to lighter weight have been prevailing rapidly in the packaging industries
on high speed
operation. On the other hand, to increase an efficiency of the production,
the number of multi-ply layers is reduced by heavier base paper.
Heavy Industries has developed a new Roll Blade former to respond
these market requirements. This new former has high drainage
capacity, operational flexibility and gives excellent paper quality.
first installation will be start-up in April 2005 in Germany.
of Biopulping Process with Cellulolytic Activity Suppressed Coriolus
Seiji Nakagame, Mari Kabuto, Toshiko Sakaguchi, Sayaka Nakao,
Akira Tsukamoto and
Oji Paper Co., Ltd., Advanced Technology Research Laboratory
defined as a treatment of lignocellulosic materials with lignin-degrading
fungi prior to pulping, can reduce energy and
chemicals during the pulp making process. Coriolus hirsutus, one
of the lignin-degrading fungi, is a promising strain for biopulping,
because it degrades lignin efficiently and grows at higher temperature.
However, C. hirsutus can not be directly applied to biopulping, because
the cellulolytic activity of this fungus brings about negative effects
on both pulp yield and paper strength.
In the present work, we cloned
several cellulolytic genes of C. hirsutus and constructed a tandemly
arranged antisense gene to suppress
cellulolytic activities by the genetic modification. The transformants
carrying a tandemly arranged antisense gene have lower cellulolytic
activity than the host strain. Application of this treatment to wood
chips has successfully led to higher cooking yield in chemical pulping
without any negative effects on paper strength.
Experiences of Carbonizing
Furnace of Paper Waste Sludge
Sendai Mill, Chuetsu Pulp & Paper Co., Ltd.
Sendai Mill has produced
carbonized paper-waste sludge, burned directly in sludge kiln, and
sell for soil improving material and
for steel production for long time. We replaced a new carbonizing
facility instead of old kiln, due to a decrepit facility and response
to waste disposal and public cleaning law.
On this line, dewatered
paper sludge is pelletized in zouryuuki, dried to 10% water content,
and distilled to dry carbonized materials
by indirectly-heated carbonizing kiln. Exhaust gas produced in this
distiller is burned in furnace for the purpose of the use of heat
content of sludge. This facility is not regulated within dioxin relevant
laws, because of a sludge-carbonization facility. But we placed this
facility designed with the enough idea of dioxin rules on the structure.
report about facility characteristics, operation after starting on
Nov. 2002, and product properties.
Operating Experience of Finishing
Plant, Fuji N-2 Paper Machine
Fuji Mill, Oji Paper Co., Ltd.
In 2001, we reformed the production
system of white lined board. In the papermaking plant, two former
machines were stopped and N-2
machine, the fastest machine for white lined board was built.
other hand, in the finishing plant, in order to deal with planography
products that is 80% of all products, four sheeters and
three packagers were installed.
The new main point is the perfectly
automated transport system in the finishing plant.From N-2 machine
to sheeters, the transport is
automated by conveyers and a crane, and from sheeters to packagers,
by conveyers and transporters.
In this article, we will report the
new automated device and our operating experience.
Reports of 16th
PTS CHT Symposium
Pulp & Paper Industry Department, Kurita Water Industries
16th PTS CHT (The Chemical Technology of Papermaking) Symposium
took place in Munich, Germany during 15 to 17, September in 2004.
37 of research and technical paper were presented. They covered the
innovation in pulping, papermaking, environment, chemicals and mechanical
engineering. In this report, retention aid, water management and
scale control were reviewed.
Reports of 2004 TAPPI Fall Technical
Fushiki Mill, Nippon Paper Industries Co., Ltd.
The 2004 Fall Technical
Conference was held during October 31 ? November 3, 2004 in Atlanta,
Georgia, USA. It was the joint conference
of Pulping and Engineering. The huge conference provided 97 presentations
in 39 sessions in 4 separate rooms. Topics of my interest included
・Opportunities for cost reduction in pulp
・Improving bleach plant operation.
・Optimizing pulp mill operations
through process simulations.
SEC-MALS Study on the Molecular Conformation
of Modified Starches for Papermaking
Pulp and Paper Research Laboratory, R&D Division, Nippon Paper
Industries Co., Ltd.
Masahiro Yanagisawa and Akira Isogai
Graduate School of Agricultural
and Life Science, The University of Tokyo
Modified starches such as
hydroxyethylated, acethylated, hydorhobic ester, and oxidized starches
were widely used in papermaking industries
as a surface strength agent or a binder of coating color pigment.
However, the molecular conformation of these modified starches in
aqueous phase was not fully understood. The purpose of this study
is to investigate the molecular conformation of modified starches,
which helps ideal chemical modification design for certain papermaking
Investigations based on size exclusion chromatography (SEC)
and multi-angle laser light scattering (MALS) were conducted to assess
the influence of chemical modification and degree of substitution
(DS), molecular mass, and solubilization method on the macromolecular
features in aqueous phase of modified starches for papermaking. SEC-MALS
analysis revealed that increasing the DS value of hydrophilic group,
decreasing the molecular mass by acid treatment or oxidation, and
alkaline dissolution made the modified starch macromolecular more
expanded conformation in water solution.
Keywords: modified starch,
SEC-MALS, conformation, hydroxyethylated starch, surface strength