Deposit on Pre-Drying Part Producing Fine Paper at Kure Mill
Kure Mill, Oji Paper Co., Ltd.
No.5 Paper machine at Kure Mill, which has started operation
as a fine paper machine in 1989,also now produces LWC paper
in response to the market demands. Major trouble on Producing
Fine paper comes from Spots. Spots originate from DIP for LWC.
This introduces Solutions for the Dirt from Pre-Drying Part
Recent Trend of Paper Chemicals for Surface Treatment
- Surface Sizing Agent Polymaron-E100 Series -
Paper Chemicals Division, Arakawa Chemical Industries, Ltd.
Recently, the paper manufacturing companies in Japan have
been increasing waste paper stock usage as a result of taking
the environment and resources-preservation issues into consideration.
Besides, the operation of paper machines and coaters at higher
speed in order to reduce the production cost leads to the
harder situation for the paper chemicals to show their efficiency.
In fact, the retention of internal sizing agents and the effectiveness
of surface sizing agents tend to decrease.
Under the circumstances, it is strongly noticed to make paper with higher qualities
and wider versatilities using surface agents that can improve the surface quality
of paper. At this time, we shall present our surface sizing agents, POLYMARON
E-100 series, together with the latest technical tendency of the agents.
POLYMARON E-100 series show higher sizing effect compared with conventional
surface sizing agents. Particularly when coated on neutralized papers, they show
sizing effect, writing quality and ink-jet printability. Moreover, they have
excellent mechanical stability and less foaming property which is good for operation.
Trend of Shoe Calender
- Application for Bulky Sheet -
Hiroshima R&D Center, Mitsubishi Heavy Industries, Ltd.
Recently better surface for high quality printing and bulky
paper for saving pulp consumption are required in our market.
Calender is applied for paper and paperboard to make bulky sheet.
Long nip dwell time and low nip pressure are key factors to make
bulky sheet. Uniform smoothness, high stiffness and better printability
are further benefits of shoe calender.
MJ calender is applied the technology from shoe press, and meets
above requirement. This paper introduces outline of MJ calender
and shows data from the pilot trial and field.
Non Contacting Caliper Measurements (Laser Caliper Sensor)
Sales Development Dept., Honeywell K.K.
Direct thickness measurements (also called “caliper” sensors)
provide an actual thickness measurement of paper web. There are
two methods used to provide this. The first is to measure the
distance between two product contacting sensing “elements”. The
other is to assume the distance between two sensor heads is fixed
and to measure the distance to each head from a product to their
support. Of the two methods the first will typically provide
the highest degree of accuracy and repeatability but needs to
either physically touch the material to keep the sensing element
at a fixed standoff distance. The contacting sensor sometimes
causes the marking, damage and dirt spike problems to products
especially for lightweight papers on high-speed machines and
supercalender applications. Also the contacting head of Caliper
sensor itself has abrasion and dirt build-up problems as a maintenance
So the second method has been developed for a long time, but
non contacting methods typically have accuracy problems as a
scanning on-line sensor because of the assumed fixed head separation.
Honeywell has solved this issue by physically compensating the
separation in the two sensing heads and introduced the Non Contacting
Laser Caliper. The method for looking at the distance of each
sensing head to the sheet and assuming a fixed distance between
the two sensing heads is using laser triangulation and Z sensors.
This paper presents the new developed Honeywell NC Laser Caliper.
Optimization with Updating PM4 Paper Quality Measurement and
Control System at Sendai Mill
Paper Making Department, Chuetsu Pulp & Paper Co., Ltd.
The paper manufactures in Japan have recently faced on necessity
of manufacturing of a wide variety of products in small quantities，along
with competition with the import paper and diverse needs of customer.
Therefore, grade change on PM has been being on the rise and
more controllability on PQS (Paper Quality and Control System)
has been required for smaller loss on grade change.
In this article, the operational experience of latest PQS which
was replaced on Sendai PM4 in 2004 is introduced.
Latest Tail Threading Technology
Metso-SHI Co., Ltd.
Paper machine production speed is getting faster, 1900 m/min
for LWC, 1600 m/min for fine paper and 1500 m/min for board,
and production per year is reached to several hundred thousand
tons. In high speed machine, to reduce the loss caused by web
break and grade change, and to urge the automation instead of
experts, are very important things to improve the production
Metso Paper developed improved tail threading device with advanced
vacuum conveyor technology, PressForce for press section, SingleForce
and DoubleForce1 for dryer section and FoilForce1 for calendar
section. These new tail threading devices shorten tail threading
time compared to conventional systems, enhance both human and
mechanical safety by eliminating rope accidents, increase production
line efficiency and reduce unexpected production downtime.
- Reduces Capital Intensity in the Bleach Plant -
Kvaerner Pulping AB, Sweden
Kvaerner Pulping KK, Project Department
The technology relating to the bleaching of pulp relates not
only to the chemicals used in the bleaching sequence but also
to the washers and how the bleaching system as a whole is designed.
In this paper, a novel bleach plant system called Compact Bleaching™ is presented. This system represents a paradigm shift in the
design of a bleach plant, as it addresses a number of hot topics.
With a Compact Bleaching™ bleach plant it is possible to
reduce the electrical energy consumption by some 25 %, to handle
pulp fibers more gently and to reduce the building volume by
as much as 25-50 %.
The Corrosion Resistant Materials for the Paper Industry
Hideaki Kawamura and Michio Nishi,
For the extension of the valve durability, KITZ has developed
and manufactured high corrosion resistance valves such as super-duplex
stainless castings and pure nickel castings and so on. On this
paper we report on the effect on the corrosion resistance of
the alloy elements and on the corrosion examination test results
in the corrosion medium such as sulfuric acid, chlorine dioxide
and ozone of used by the paper manufacture industry.
A Novel Insolubilizing System for Polyvinyl Alcohol (PVA)
Hiroaki Yokoi, Hideo Baraki and Kenji Nasu
SEIKO PMC CORPORATION, R&D Division
Recently, demands for efficient insolubilizing systems for
polyvinyl alcohol (PVA) have been increased with market expansion
of communications paper such as thermal paper. Various kinds
of insolubilizing systems have been developed, but there are
still problems to be solved, for example, insufficient performance,
corrosion of thermal head in printer due to chloride ions.
Thus, we have developed a novel insolubilizing system composed
of carboxylated anionic PVA (A-PVA), polyamide-epichlorohydrin
(PAE) and polyethyleneimine (PEI). Our novel system with insolubilizing
agents called “PVA insolubilizer, CP series” has advantages
of performance and reduction in chloride ion contents over
A-PVA/PAE combination system.
First, performances of various systems with or without PAE/PEI were studied
for different types of PVAs, using cast film from their solution. The results
that A-PVA/PAE/PEI combination system has an excellent insolubility. Application
to over-coated layer in thermal paper is also exemplified. Then, mechanism of
insolubilization by the combination system is briefly discussed.
Development of New Agent for Ink Jet Paper
Kentaro Ono, Hideki Touda and Junji Kasai
ZEON CORPORATION, R&D
Center, Elastomer & C5 Chemicals
Recently, the growth of Ink jet Paper industry is remarkable.
That is because the quality of Ink Jet printing method has improved
especially at personal use.
The coating layer of Ink Jet paper include a large amount of
cationic resins compared with offset printing paper system. Because
the cation resins work as a receptor of anionic Ink jet reagent.
The common SBR latexes have been used at Offset printing paper
as a binder of coating layer. On the other hand, Polyvinyl alcohol
(PVA) is the main binder polymer of Ink jet printing because
normal SBR Latexes are modified by anionic surfactant, so it
caused coagulation between anionic latex and cationic resin.
In this case PVA-g-Latexes are developed as using just PVA as
protective colloid having stability against cationic chemicals.
In this report the characteristics of PVA-g-Latex and application
as a binder of Ink Jet coating layer are introduced.
Anaerobic Treatment of KP Evaporate Condensate
Hidetaka Taneda, Osamu Asada, Masahiro Murata, Yuko Iijima, Takahide
Monma, Yutaka Nuruki and Isao Onodera
Nippon Paper Industries Co., Ltd.
Yufutsu mill of Nippon Paper Industries has started a long term
trial on anaerobic treatment of the operational condensation
from KP black liquor. In this trial, the effect of the condensation
variation on the removal rate at this plant was observed. After
several arrangements, this system will help the mill to decrease
COD discharge and supply new energy resources without any cost
On-line Hardness Measuring System for Paper Roll
Nomura Shoji Co., Ltd.
Uniformity in hardness of paper rolls is well known as one of
important properties to avoid paper break and registering error
during printing process where paper speed is increasing year
by year. Therefore, to get accurate hardness profile on every
paper roll is essential to establish a reliable quality management
In 2003, Tapio Technologies Oy, a laboratory equipment manufacturer
in Finland launched a handheld Roll Quality Profiler, RQP, with
which anybody can easily and quickly measure paper roll hardness
profile on paper rolls.
Based on the advantage in design and experience in the handheld
RQP, Tapio Technologies Oy has developed a new On-line Roll Quality
Profiler, “On-line RQP”, and Nomura Shoji Co., Ltd. has started
sales of On-line RQP here in Japan.
A Report on 2005 TAPPI Engineering, Pulping and Environmental
Akihiro Kakehi*1, Takuya Yamamoto*2 and Tadashi Kano*3
*1 Oji Paper Co., Ltd.
*2 Nippon Paper Industries Co., Ltd.
*3 Japan Technical Association of the Pulp and Paper Industry
2005 TAPPI Engineering, Pulping and Environmental Conference
was held on August 28-31, 2005 in Philadelphia, PA. The number
of registered participants was 457. Japanese participants were
three people mentioned above. Seventy sessions were held during
three days of August 29-31, six to nine of which were took place
simultaneously. The number of presentations was about 180.
The Effects of Cationic Polymer Addition on Size Retention and
Paper Sizing Performance in Rosin Emulsion Sizing
Pulp & Paper Industry Section, Kurita Water Industries Ltd.
Various cationic polyacrylamides (C-PAM) were added to pulp
slurries for fixing rosin emulsion size, and the polymer properties
influencing size retention ratio and paper sizing performance
were studied. C-PAM with a high cationic density improved the
retention ratio of rosin size, although paper sizing performance
was low compared with C-PAM having a low charge density. These
results show that sizing performance is influenced by not only
rosin size content in handsheets but also the properties of C-PAM
co-added to pulp slurries.
When calcium carbonate filler and C-PAM with a high charge density
were used, rosin emulsion size tended to adsorb on not only pulp
fibers but also the filler. Both size retention and paper sizing
performance were improved, when C-PAM was added after the rosin
emulsion size addition to pulp slurries rather than the inverse
addition sequence. Furthermore, the longer the duration time
between rosin emulsion size and C-PAM additions was, the lower
the size retention as well as the sizing degree of the rosin-sized
paper were. These results suggest that C-PAM should be applied
to pulp slurries after the addition of rosin emulsion size for
achieving more efficient paper sizing performance.
Keywords:C-PAM, rosin emulsion, fixing agent, sizing degree,