of the System which Allows the Commercial Scale Plantation Using
the Plus Trees of Eucalyptus globulus
Research Center, Mitsubishi Paper Mills Limited
a kind of eucalyptus, is well known as a commercially valuable
species for plantation with its excellent growth rate and
its high density. But clone plant production through cuttings have
not been applied in commercial scale due to the difficulty of rooting
from the cuttings and also due to the lack of the selected plus trees.
of our study is to select the plus trees of Eucalyptus globulus and
develop the system which allows the commercial scale
plantation using the selected plus trees. In this paper we report
our experience on the selection of the plus tree showing superiority
in growth, density and others from the plantation area, propagation
of clone plus trees having excellent growth rate and rooting capacity
through cuttings, and plantation trial of the plus trees.
As a result,
plus trees showing more than 50 % higher volume growth rate and more than 10
% higher density were selected through the
study and established cloning system which allows the commercial
scale plantation of thus selected plus trees.
Hardwood Kraft Cooking
― Emphasis on Raw Material Variability and Hexenuronic
Acid Formation and Removal―
Metso-SHI KK, Japan
Lars-Ake Lindstrom1and Maria Wennerstrom
Metso Paper Sundsvall AB,
Recent years have seen a lot more research focusing on hardwood
pulping and bleaching processes. Although the understanding of these
processes and the importance of raw material variability have increased,
it has become obvious that there is still more to learn. Yet, technology
It is possible to adapt cooking conditions for low Hexenuronic
acid content of unbleached pulp, improving bleachability and decreasing
brightness reversion. Today's modern light ECF bleach plants, utilising
improved oxygen delignification technology and high consistency ozone
bleaching, have made it possible to decrease effluent emissions in
a cost efficient way, while maintaining pulp quality. Optionally,
TCF bleaching is possible that would bring emissions to very low
The Latest Screening Technology
- Newly Developed Ultra Energy Saving
Screens & New Theory of
Screen-Plate Designed by Hydrodynamics -
Aikawa iron Works Co., Ltd.
Screening performance has been dramatically
improved by the development of bar type screen cylinder. Especially,
this technology has contributed
to improve sticky problems which is one of the most important subject
for recycling fiber treatment and power saving in screening department.
We, Aikawa, was awarded “Sasaki-Prize” by Japan Tappi for the “GranFlow-Screen”
as the most superior development for the year of 2000. This paper
reports the most recent technologies regarding to power saving
of screening field that we have further developed since 2000.
Pulp Bleaching with the Aikawa ConiDiscTM Disperser System
Nippon Paper Industries Co., Ltd.
Technical & Engineering Div.,
Industries Co., Ltd.
The Nippon Paper Industries Iwanuma Mill has
three newsprint paper machines. To increase the DIP rate of newsprint
production, a new
DIP process (DIP-3) was started up in July 2003. This process was
given consideration to reduce sticky trouble at the paper machines.
So we introduced the latest machines and new ideas.
The Aikawa ConiDisc
Disperser System is one of the new machines, which was introduced
to the new line at this time. The Conidisc consists
of a conical-zone and a disc-zone. Because of that shape, it has
two characteristics both high-speed disc-disperser and low-speed
kneader. Since DIP-3 started, we have gotten good operations out
of the ConiDisc in sevaral phases. This paper mainly reports the
DIP bleaching with the Conidisc and other effects of this machine.
New Fixing Agent for Rosin Emulsion
Kurita Water Industries Ltd.
Anionic trashes or anionic interfering
substances are released into the water phase from contaminated
reused water, recycled fibre, or
broke, and form deposits at papermaking process including the wet-end,
press section, machine fabrics and rolls. The anionic trashes can
cause loweing of productibity by defective products; sheet break,
short shutdown duration. These kinds of troubles can be controlled
by dosing cationic coagulant.
On the other hand, papermaking trouble
is also deriving from the inadequated using of chemicals, such as
poor fixing or over dosing
of chemicals. These chemicals also behaviored as interfering substances
when they enriched in the white water cycling loop.
This paper focoused
on the unfixed rosin sizing agent, and discussed the chemical charactors
and behaviors of the rosin fixing agents
by lab and field trials.
Effects of Pigment Shape on Paper Properties
Taro Homma and Takashi
IMERYS MINERALS JAPAN K.K.
Rajan R. Iyer
IMERYS Pigments for Paper Americas
It is well known that the flat
shape of kaolin particle contribute to paper/print gloss and opacity
in coated paper. A flatter (high
aspect ratio) particle gives improved coverage and smoother surface
properties for coated paper. Print gloss will also improve from a
coating structure using higher aspect ratio pigments. However to
measure a pigment's aspect ratio is a time consuming procedure, so
there seems to be few detailed studies of the correlation between
the aspect ratio of a pigment and coated paper properties.
aimed to research the effect of the pigment's aspect ratio on coated
paper properties, especially in light weight coated
paper in which the physical characteristics of pigments have a larger
The Effect of Latex on Print Gloss
Latex Research Center,
NIPPON A & L INC.
In recent years, the quality demands to the
higher grades of coated paper have been extremely diversified, emphasizing
on sheet gloss,
print gloss, whiteness, opacity or low density, then so many new
grades of coated paper were released to the market during the last
few years. The emphasized "print gloss" grade beyond LWC
especially made a major trend because print gloss has been thought
the most important quality in the final printed products.
been generally thought that "generation" and "leveling”
of the split pattern of the printed ink is very influential to print
gloss, and that the former ink behavior is mainly affected by printing
pressure, speed and the amount of ink supplied to the coated surface,
the latter ink behavior is greatly affected by the penetration speed
of ink vehicle into coated layer. Moreover it has been experienced
that the design of latex is very influential on print gloss.
paper, we tried to explain the print gloss by the two types of ink
behaviors, the primary and the secondary ink penetrations,
with varying design of latices used in coated layer as the main binder.
The primary ink behavior is defined by wetting of ink toward coated
paper surface and the secondary one is defined by ink penetration
into the coated layer. It was concluded that the primary one play
a influential role to the print gloss, although the secondary one
has been the most influential factor on print gloss so far. The primary
ink penetration would become a very important key to improve print
gloss further in future.
Structural Analysis of Coating Layer Containing
Yoko Saito, Hideki Touda and Junji Kasai
Recently, the amount of plastic pigment used for
coated paper has been increasing because the requirement of coated
paper has been
changed to have high sheet gloss, high brightness, and good opacity.
The effect of plastic pigments existing in coating layer on the properties
of coated paper was investigated by analyzing the structure of coating
According to the results of the measurement of porosity, SEM
image of cross-section surface and analysis of its photographic image,
it is found that the coated paper including plastic pigment shows
the excellent smoothness and has a lot of pore in the coating layer
and the orientation of inorganic pigment are disordered compared
with that formulated by inorganic pigment only.
This tendency is
stronger in case of using hollow sphere. Following 2 reasons were
the existence of void due to the hollow
sphere itself and disordered orientation of inorganic pigment by
hollow sphere which has large particle size. Plastic pigment would
play an important role in order to manufacture the coated paper of
bulky and excellent optical properties. In this report we describe
these examination results.
Use of Paper Sludge Ash as Paper Filler
Shigeo Muramastu and Masato Saito
Fuji Industrial Research Institute
of Shizuoka Prefecture
Paper sludge (PS), which is exhausted in
the conventional paper-recycling process, is mostly used as a raw
material of cement at present. The
application for the cement production is, however, not able to produce
high additional value. Moreover, much amount of the other PS cannot
be used for the above application due to the low quality, which results
in the incineration to be buried under the ground.
For getting more
effective utilization of PS, we carried out a study on the reuse
of PS as raw materials of paper. In this study,
proper conditions for making fillers and pigments from PS, such as
incineration temperature, atmosphere, time and etc., were determined,
and the recycled paper was tentatively manufactured using these fillers
and pigments. It was confirmed that the cost to make paper using
PS-derived raw materials was cheaper than the cost to dispose PS
and make paper using new raw materials.
The PS recycled paper is now
submitted to a feasibility examination to launch toward a commercial
production by the collaboration with
Safety Standard of Machinery and Safety Components
- A New Direction
of the Safety Standards -
Project Sales Department Safety Component Group
OMRON Co., Ltd.
In Japan, occupational safety at work has been based
to avoid danger" until now. However, this culture is now becoming
difficult in front of the foreseeable social change, for instance,
aging of skillful experienced worker, increase of part-time workers
and alien workers with different language and culture. In this circumstance,
it will be indispensable to shift the culture to the occupational
safety based on safety design. Because worker may make a mistake
and machine may break at anytime.
For safety design of machine,
it is practical to use safety components in accordance to international
standards for safety such as ISO and
A Study of the Relationship between Coated Papers and Reverse-Image
Yuichi Shiba and Tetsuya Nishi
Corporate Research Center, Mitsubishi
Paper Mills Limited
Reverse-image ghosting is one of the ink transfer
errors that occurs during web-fed offset printing. It happens when
the imaging area
on the face and the back are not balanced. This paper report what
properties of coated paper influence reverse-image ghosting. Reverse-image
ghosting was not influenced by water absorptiveness, stiffness or
picking intensity. However, smoothness had a comparatively strong
relationship with ghosting. In particular, dynamic (PPS) roughness
under 20 kgf/cm2 of hard backing was strongly related to it. And
in the case of the same PPS roughness, ink receptivity was related
to ghosting. These results support the idea that reverse-image ghosting
is caused by improper web release of paper, which leads to ink piling
on the blanket cylinder and ultimately to reverse-image ghosting.
Keywords: offset printing, ghosting, coated paper, delamination,