TAPPI JOURNALVol. 56, No. 11
November 2002 Abstracts
Cationic rosin size for weakly acidic and neutral papermaking
Muneo Sakamoto and Che On Au Nissan-Eka Chemicals Co., Ltd.
High levels of calcium carbonate in waste furnishes and increased contaminants
in the closed backwater systems have set new demands on rosin sizing in neutral
pH. Eka Chemicals have developed new sizing systems to meet these challenges
・Rosin ester (Bewoid Extra)
・Use PAC (Ekafloc) instead of alum
・Rosin aluminium pre-mix (Bewomix System)
・Cationic rosin size (Composize)
Cationic rosin size, consisting of rosin particles stabilised by cationic polyelectrolytes
via protective colloid action, represent the best approach to rosin sizing at
neutral conditions. Due to its self-retention property, cationic rosin size can
give superior sizing efficiency, reduction in alum usage, and improved machine
Keywords; Sizing at neutral pH, Cationic rosin size, Rosin ester, Rosin aluminium
Blow through Steam Reductuons with the ‘Flonage’ System
Taimei Koki Co.,Ltd.
Spirax Sarco (Japan)Ltd.
The ‘Flonage’ System is the system which brings a dryer perfect condition, by
controlling blow rate with a separator and steam flow meter installed on the
downstream of the dryer.
The ‘Flonage’ system enables heating pressure (temperature), revolving speed
and steam blow rate to be standardized in figures. Also, this system is highly
effective in optimizing energy consumption rate by minimizing steam blow rate
Advantages of the ‘Flonage’ system are as follows.
1. Easy standardization by optimizing blow rate in figures for a best manufacturing
2. Stable production by blowing quantitatively, no matter how pressure fluctuation
on the downstream is.
3. Minimizes energy consumption unit by the decreasing unnecessary steam blow.
4. Improves boiling in the condensate tank.
Development of High Corrosion-resist Surfaces for Metering Roll
Norio Fujita and Yasuhiro Mochida
Nomura Plating Co., LTD
We reported corrosive phenomenon of metering roll from an electrochemical standpoint
last year. Its result showed a few combinations of top-coat and under-coat may
show higher corrosion resistance than conventional coating. So actual corrosion
resistance was verified by corrosion test in dynamic condition with test plant
size machine. As a result, Cr coating on Ni-W alloy coating showed superior corrosion
Advantages of the Flexishaft for Progressing Cavity Pump in Paper and Pulp
Iwaki Co., Ltd. Promotion Department.
For the color coating process in Pulp & paper industry, lots of pumps are
installed. Among these pumps, Progress-Cavity pump is mostly prevailed.
"Mono Pump" company of United Kingdom have succeeded to develop new
kinds of joint, called flexishaft less joint, which is very far from conventional
idea of joint.
The flexishaft has no wearing parts as a new construction of oil-less. That
created the advantage of Progress-Cavity pump and makes it easy handling.
We now would like to explain the effects of the flexishaft for Progress-Cavity
Trend in Mechanical Seal Technology in Pulp and Paper Plant Failure and Countermeasure
Examples of Mechanical Seal
EAGLE INDUSTRY Co., Ltd. Seal Engineering Dept.
In a pulp and paper plant, a large number of water pumps and various different
pumps for pulp or chemicals are utilized in the production processes from economical
point of view (energy saving, resource saving and maintenance saving) and environment
preservation point of view. Mechanical Seals are also utilized for other rotating
equipment including agitators, screens and refineries. This text describes failure
and countermeasure examples of Mechanical Seal for pulp and paper industry.
Latest Activity of Algas Microfilter−The Reference Report from Japanese Market−
Itochu Sanki Corporation
In compliance with social requirements on environmental protection, pollution
control for water at a pulp and paper mill is becoming more and more important.
Also, water consumption need to be decreased in light of material resource saving
as well as production cost saving.
Under the circumstance, not less than 500 Algas Micro-Filters (AMF) are running
all over the world and we have installed 14 AMF in Japan since 1998. AMF can
contribute to re-use fibers, clear water and additives from white water, effluent
water etc. and to reduce cost of water treatment as well as water discharge.
This report is to explain the basic construction and features of AMF and the
successful references of AMF installation in Japan.
E.C.H. Will Model "GFS" Global Folio-size Sheeter
K. K. Irisu
Since 135years E.C.H.Will Hamburg is one of the leading manufacturers of converting
machinery for the paper industry.The company has gained worldwide acknowledgement
when introducing cut size sheeters for copy paper. These machines are used worldwide
by all well-known paper makers and also in the meantime by smaller paper converting
With regard to folio size sheeter E.C.H.Will was and is reknown for special
solutions instead. Based on and with the knowhow of hundreds of cut size sheeters
and some hundred folio size sheeters having been delivered, the concept of the
Will "global folio size sheeter" type GFS has been developed.
The great technical experience in cutting and transporting paper as well as
introducing innovative ideas, new materials and, last but not least, the influence
of various customers' requests, which are known to E.C.H.Will from numerous special
projects, were the base for development of the GFS folio sheeter.
Introduction of Calculation Soft for Pressure Dropping in the Transportation
Piping of Liquid Pulp Sigeru Saito
Engineering Group ，KITZ Corporation
Generally speaking, the pressure dropping degree of pulp liquid depends upon
the nominal size of piping and concentration, speed and freeness of the liquid.
On the equipment designing, the calculation of pressure dropping is one of the
most important things in selections of pump and nominal size of piping and control
valves, however, as indicated in the Figure 1, it seems very difficult to calculate
manually in each case.
Upon the requests from our customers and under the above situation, we have
developed the unique calculation soft with our own invention, in order to realize
an easy calculation by the personal computer.
It has already been introduced for some particular customers, but we, hereby,
would like to make it open for all customers. We are very pleased, if this soft
could be useful for you.
Fibers, Fillers and Fines Recovery from the Process Water Coming from Paper Machines
and Stok Preparation- O.M.C."GAMMAFILTER"-
Taizen Co., LTD.
The GAMMAFILTER assures, compared with the traditional filters, a very large
surface (6 times larger), thank to the particular shape of the wires.
The suspended materials settle in the inner side of the drum, which constantly
turns around its axis, forming a layer, whose thickness grows gradually as the
drum dips into the water.That operation improves the filtering action, too. If
necessary, some chemicals can beadded in the feeding to optimize the coagulation
or the flocculation.Thanks to a level difference of 30cm max from the inner and
the outer part of the drum,which can be adjusted by a mechanical overflow, the
water naturally flows by gravitytowards two symmetrical lateral purges.
The suspended solids contained in the water settle on the wires and create a
layer whichstays on them.
High Rate Nitrogen Removal Process by Moving Bed Biofilm Reactor"PABIO DENI"
Proposal Department, Environmental Systems Division, Shinko Pantec Co., Ltd.
The necessity for nitrogen removal is increasing from the viewpoint of eutrophication
control in recent years. Although a Modified activated sludge process was prevalent
in the nitrogen removal process, since there are some faults such as long Hydraulic
retention time (HRT), the various efficient process of replacing with this process
have come to be developed and put in practical use. We put in practical use nitrogen
removal process, PABIO DENI, which is the fluidized bed using the carrier elements
made from polyethylene as a moving carrier elements. This process has the characteristics
that the treatment in the HRT of 1/2 to 1/3 of the modified activated sludge
process is possible, the high nitrogen removal efficiency is acquired at 10℃,
and it can be adapted for the various forms of existing reactors, etc.
A demonstration tests confirmed efficient and high treatment capability such
as a high removal ratio as 98 % or above with volumetric loading 0.9 kg-NH4-N
/m3･d for nitrification and with 3.5 kg-NO3-N /m3･d for denitrification, the
nitrogen in treated water becomes below 10 mg / L even if HRT is 5 hrs.
In this report, while an outline of the principle, the structure and the treatment
method of the fluidized bed nitrogen removal process is introduced, a part of
the demonstration test result is reported.
Keyworld: Nitrification,Denitrification,Moving Bed Biofilm Reactor, Carrier Elements
Current Progress in Plant Genome Research and Tree Biotechnology-Present and
Graduate School of Bio-Applications and Systems Engineering (BASE), Tokyo University
of Agriculture and Technology
Progress in molecular biology in the 1980s brings enable us to analyze various
type of biological nature of plants at the molecular (DNA) level. Genetic engineering
based on the molecular biological techniques provided exciting opportunity to
produce transgenic plants and mutant lines with altered phenotypes and to better
understanding the physiology, biochemistry of plants. Furthermore, much of knowledge
how plant grow and develop has been gained from research in genome area such
as complete genome sequence Arabidopsis thaliana that is being used worldwide
as a model organism for basic and applied research in plant biology. Likewise,
novel approaches such as express sequence tags, genome sequencing and enhancing
traditional strategies for woody plant research. This paper provides a comprehensive
overview of tree biotechnology and the areas currently being researched on biosynthesis
of cell wall.
Report on 2002 TAPPPI Coating Conference-Recent Trend of Coating Technologies−
Akio Okagawa, Ph. D.
Noah Enterprise Limited
TAPPI 2002 Coating and Graphic Arts Conference and Trade Fair was held at Rosen
Center in Orland, Florida on May 5 to 8, 2002. More than 600 people of paper
industry and allied industry from all over the world attended the conference.
This report summarizes the contents of the conference. Recent developments of
non-impact coating such as curtain coating and spray coating are almost reality.
It is the matter of time we will see an actual installation near future. Further
new technologies presented at the conference is dry coating using electrostatic
force and thermo-mechanical treatment. Number of new developments on coating
pigment, especially engineered type kaolin and calcium carbonate, latex binders
and various chemicals to improve coating operation were also presented.
Techniques for analyzing paper properties by applying image processing to light
Tomohito Nakayama, Toshiharu Enomae and Fumihiko Onabe
Graduate School of Agricultural and Life Sciences
Contact e-mail address: email@example.com
The pattern matching technique is applied to light transmission images to analyze
paper properties and its versatility is demonstrated. A prototype system developed
for obtaining light transmission images consists of a CCD camera, diffuse illumination
from the backside of a specimen and software. In pattern matching, one of the
two images to be compared is divided into small rectangular blocks. The other
image is searched for a block with a similar pattern to one of the blocks of
the first image taken as a template block while the block frame is moved pixel
for pixel. The similarity is judged based on the inner product of the two block
images as a vector. Ten-fold interpolation with the high-resolution bi-cubic
spline interpolation function is successfully applied to estimate the deformation
distribution with ten-fold precision. In-plane distribution of tensile deformation
is measured well even for paper with good formation. This technique is applied
to in-plane distribution of restraint drying shrinkage of wetted copy paper.
When a paper specimen is set and constrained vertically, every block around the
center of the specimen totally shifted upward. It is because water moves downward
by gravitational force, resulting in that the top part that dries and shrinks
earlier draws the fiber network mostly from the flexible wet part immediately
below. Thermography proves the water movement as a portion of low temperature
due to absorption of evaporation heat remains to the last moment around the bottom
part. On the contrary, when set horizontally, the specimen does not exhibit any
total shift in the restraint direction, but shows shrinkage only in CD as well
as observed with the specimen set vertically. For free drying of the copy paper,
a flatbed image scanner was used to acquire images. The shrinkage tends to occur
in a complicated manner, distorted by mixture of CD and MD shrinkages.
Biobleaching of Kenaf and Shirakaba Pulps by Wood-rot Fungi
Yoshito Ohtani, Yoko Ohmae, Jareeya Yimrattanabovorn and Kazuhiko Sameshima
Faculty of Agriculture, Kochi University
White rot fungi OM5-1 and KUF2 isolated from the experimental forest of Kochi
University had high abilities to brighten the kenaf bark pulp and the shirakaba
pulp, respectively. Bleachabilities of both fungi were compared with those of
standard fungi, i.e. Phanerochaete chrysosporium and Pleurotus ostreatus. Brightness
increase of kenaf bark pulp by OM5-1 was much larger than that estimated from
kappa number decrease. The similar tendency was observed when the shirakaba kraft
pulp was bleached by KUF2. Bleachability of kenaf core pulp by fungi was not
similar to that of kenaf bark pulp, but to that of shirakaba pulp.
Cumulative activities of ligninolytic enzymes from each of above four fungi
had linear relation to the pulp brightness increase obtained by each fungus treatment.
But, during later periods of treatment only the kenaf bark pulp showed higher
brightness out of this linear relationship.
For kenaf bark pulp and shirakaba pulp, OM5-1 and KUF2 showed the highest pulp
Keywords: kenaf bark pulp, kenaf core pulp, biobleaching, white-rot fungi, ligninolytic