TAPPI JOURNALVol. 58, No.9
September 2004 Abstracts
New Developed GelViewTM Sensor to Optimize the Coater Drying System
Sales Development Dept, Honeywell K.K.
Uniform coating is a complex and difficult issue, as the coating process is
affected by a large number of interrelated variables, ranging from the recipe,
theology and application solids, to base sheet porosity and the unique characteristics
of the coater. One key element for end coating homogeneity is control of the
coating consolidation process. The ability to control the rate of evaporation
requires continuous control of both air dryers and infrared (IR) dryers, providing
the papermaker with a valuable tool to significantly enhance their product quality.
This paper presents a new method with a new developed GelViewTW sensor for monitoring
and controlling the rate of drying coatings. The method consists of a series
of fixed-point measurements, distributed along the path of the coater dryer section,
configured to produce outputs enabling monitoring and control of the drying rate
along the length of the coater. The individual measurements are presented in
a standard operator station and track the reflective changes of the surface of
the coating. The GelView is a fiber optic based system, which, through its complex
algorithm, is capable of combining the surface condition data with other quality
control data to produce a robust analysis of the drying rate of the coating.
This new ability enables the papermaker to optimize production while minimizing
or eliminating quality problems, such as back-trap print mottle.
New Modified Starch for Surface Size Press
Research and Development Laboratory, Oji Cornstarch Co., Ltd.
We report new modified starch for improving surface strength of paper. Recently
according to increase of waste paper, surface strength of paper tends to be lower,
and at the same time printing press is operated more high-speed and has a function
of multicolor printing for spread of offset printing, so that printing trouble
is increasing such as picking, scuffing and break.
We have developed new amphoteric starch suitable for offset printing papers.
This amphoteric starch shows more stable viscosity than commercial oxidized
starch and has high water resistance on treated paper.
Size pressed paper with this amphoteric starch improves surface strength of
Treatment Capacity of Rotary Press Filter- Test Result of Continuous Operation
Application Development Section Process Engineering Department
Machinery & Equipment Division, TOMOE ENGINEERING CO., LTD.
Rotary Press Filter, a rotational pressurized dewatering machine with a new
dewatering mechanism, which was introduced from Fournier Industries Inc. in Canada
and is currently manufactured and sold by Tomoe Engineering Co., Ltd. Because
of its high dewatering capacity, simple mechanism, sealed structure without odor,
compactness that can reduce energy cost, and superior maintenance, Rotary Press
Filter is considered to be a dewatering machine suitable for the future. We have
installed 23 units (including sewage) and 3 units (2 places) for paper waste
sludge only in Japan. In addition, we are continuously carrying out dewatering
tests of various materials with a test machine and have obtained good results.
In this report, I will introduce the test result of the continuous operation
conducted for about three months at paper company A including comparison with
other dewatering machines.
Sulfuric Acid Inline Diluting System- Various Application of the Sulfuric Acid
for Cost Reduction, and Its Safety Dilution -
Research & Marketing Dept, IWAKI CO., LTD.
Sulfuric Acid, being used for additional ph adjustment of white water and adjusting
ph in waster water application for a long time, is used for removing secondary
products in proceeding Elementary Chlorine Free and Total Chlorine Free, and
used as a part of substitute of Aluminum Sulfate for a cost saved assistant of
sizing agent in Acid paper making and of reinforcing agent in neutral paper making.
Aluminum Sulfate of having a purpose of ph adjustment is easy to handle and very
popular chemical, therefore it had been added roughly to pulp making application
but the cost is 2 or 3 times higher than 98% Sulfuric acid and it can be easily
targeted for cost saving. Large cost saving will be made by substituting a part
of Aluminum Sulfate.
Batch treatment is widely used for diluting Sulfuric acid but it should be changed
to deeply considered safety method for human and environment as the application
becomes wider. In meaning of safety method, we hereunder introduce our in-line
Feature of in-line diluting system is high productivity because of easily and
quickly manufacturing of whatever concentration and volumes in whenever needed.
Moreover, storage tank is not required and space is saved, besides effect on
human can be avoided.
Iwaki’s Sulfuric dilution system has a unique design coming from various features
being provided by pump maker. In-line mixing of using centrifugal pump was accomplished
by using our own pump controller. Process time of the dilution becomes tremendously
shorter and productivity becomes greatly improved. As the generated temperature
varies by the concentration of dilution, we provide the best diluting method
for each concentration for preventing the dilution from boiling and our using
flexible tube absorbs heat expansion and contraction of piping. At the mixing
point, siphon prevention function is employed and secondary safety function of
checking valve failure is also employed. Besides, it also has a function of preventing
convection caused by difference of specific gravity. For safety it has transparent
plastic cover on piping units for accidental chemical spouting. Regarding system
protection, our system has an alarm output in case of detecting flow rate variation
(concentration change), upper temperature limit (for piping protection), upper
and lower pressure limit (for piping protection) and abnormal works of motor
driven valves (for piping protection). Also our system as a protection program
of stopping whole equipment in case of detecting a tripping of the pump inverter,
thermal relay operation, wrong operation in manual operation and failure of sequence
Since we do whole system controls of not only pump but also control devices
and mixing unit by our experience of various kinds of diluting, we are very proud
of offering the one year warranty on whole equipment.
Operational Impact of DFLSTM Cooking at Alberta-Pacific Forest Industries
Digester Area Specialist Alberta-Pacific Forest Ind.
Andritz K.K., Japan
This paper details the operational and economical impacts of upgrading from
Cross- flow Lo-SolidsR cooking process to DFLSTM cooking technology to produce
more than 2000 ADMT/D of Kraft Hardwood pulp. Beginning in November of 2000,
Alberta Pacific has conducted several short and long term trials to determine
if DFLSTM could benefit the digester operation by reducing the top three root
causes for lost production in the digester area.
In the past, Alberta-Pacific Forest Ind. has experienced unstable plug movement
in the digester vessel. This instability has resulted in difficulties controlling
digester level, blowline kappa excursions and blowline temperature fluctuations.
The blowline temperature fluctuations result in by passing of the atmospheric
diffuser, which is a critical washing stage.
The resultant benefits of DFLSTM mode of cooking throughout Brownstock, Bleach
Plant and Chemical Recovery are also included in this paper.
The Latest Developments in Camera Event Capturing Technology
Nippon U.S. Machinery Co., Ltd.
Paper breaks are an efficiency robbing reality on all types of paper machines
and coaters. Reducing breaks has become more and more important with the increasing
speed and operating complexities of today’s paper and board machines.
Fully digital break recording technology, using the latest CCD cameras and digital
image processing, is now offering papermakers new opportunities to find and solve
the many reasons causing breaks. These systems continuously monitor, in real-time,
all of the critical locations from the wet end to the dry end of the paper machine
and coater. When a break occurs the system downloads the event into a permanent
storage, making it possible to fully analyze what took place just before and
after the break. This allows the papermaker to take the necessary corrective
steps to prevent the break from occurring again.
Taking advantage of the latest technological advancements in digital image processing,
these systems are now able to offer high image resolution, high reliability with
minimal moving parts, and are able to provide automatic image analysis and alarming
for holes, edge faults and sheet breaks.
These systems have now been proven on all types of paper machines, from the
wet end to the dry end, ranging from slower board machines to the worlds fastest
machines producing LWC, fine paper, newsprint, tissue etc.
This paper discusses the latest available techniques in camera break recording
technology, their applications, and the results that have been achieved to date
Online Web Imaging Solution- MTS Concept and WIS (Web Imaging Solution) -
Paper & Web Solution Dept. Industrial Automation Systems Business Division,
Yokogawa Electric Corporation
This paper describes the features and merits given by Yokogawa WIS and WIS roles
in the MTS (Machine Technology Solution). The system configuration of WIS is
simple and keeps higher performance regardless of increase of cameras. WIS is
good to maintain and reduces maintenance time and cost. Also WIS performs the
automatic intensity control of light source and enables to extend a life span
of light source. WIS has easy operator interface (defect map) for human feeling
to accept. WIS provides various formation images such as displaying a reference
beside of live formation, both sheet edge one. Regarding defects to be difficult
to detect, WIS can detect water drops by transmission and lower contrast defects
such as wrinkles, weak spots by SDI (Subtle Defect Image) technology. We introduce
the overview of the advanced Auto Classifier which can classify automatically
every kind of defect by applying neural network technology. Auto Classifier can
create setting values and attributes to be needed to classify defects. WIS is
easy to expand system and able to interface with our MTS elements such as ABS,
MAS, QCS and so on.
Application of Composite Coating to The Rollers for Paper Manufacture
- Roller which is Compatible in Durability and Less-dirt -
Nomura Plating Co., Ltd.
By improvement in the speed of a paper manufacture machine, the increase in
the used paper content in materials, etc., the dirt on the roller for paper manufacture
has also increased from the second half of the 1980s. The dirt on a roller caused
increase of machine maintenance time, and the bad influence to paper quality,
and the roller which cannot become dirty easily has been desired. Therefore,
application of fluoro-resin coating roller started,and the appropriate effect
was accepted. However, the low durability of the coating itself required the
reproduction of the coating in the short period.
We started the development of the durable fluoro-resin coated roller to solve
the problem, and development and released the composite surface treatment (Tiger
roll and Jaguar roll) of the chromium plating and the fluoro-resin which will
be mentioned later in 1990. After that we have been continuing the improvement
of the resin itself and the design of composite surface with hard coating. And
now in order for marked improvement to be accepted by these improvements in the
Simulation of ink removal at a newsprint deinking facility
Bill C. Strand and Joelle M. Scheldorf
Pacific Simulation, Inc.
This paper describes three new process modules developed to simulate the removal
of ink from paper fibers and to predict brightness. These modules were used in
the simulation of a newly constructed deink plant to predict brightness throughout
the system. Model development and verification, as well as model application
to the subject deink plant simulation, are detailed. The simulation was used
to evaluate a disc thickener and a dynamic washer based on brightness gain and
A Cost-Effective Talc Solution to Stickies Control in OCC Pulps
Nihon Mistron Co., Ltd.
Gary R Williams
Luzenac Asia Pte Ltd.
Landfill space limitations and rising disposal fees are creating opportunities
for papermakers to increase recycled fiber usage. However, the recycled fibers
rich with contaminants cause manufacturing difficulties when stickies cause deposits
on papermaking equipment, thus necessitating paper machine shutdowns for cleaning.
Paperboard manufacturers that use OCC fibers spend a considerable amount of money
on cleaning chemicals to control contaminants.
This paper presents multiple case studies showing the effectiveness of a newly
developed talc product for stickies control involving paperboard furnishes. A
comparison with a chemical treatment is also included. The results demonstrate
that the newly developed talc product provided the most cost-effective solution
to the depositable stickies from recycled OCC pulps.
Rod Metering State of the Art
Horst Sprenger GmbH
Horst Sprenger is one of the well-experienced Rod manufacturers in the world
and has highest market share in European paper mills. The design concept is longer
life, less trouble and excellent finishing of surface of paper and board.
The Rods and Beds are mainly applied for the following equipments: Auto Blade
Symsizer (MESSO), Speed Sizer.Roll Flex (VOITH), Filmpress.Vari-Bar.etc. (JAGENBERG).
Main applications: Sizing, Starch application, Pre-and top-coating for Board,
HS can supply both of plain surface rod and profile rod. Due to hydrodynamic
pressure principle, coating can be achieved.
As to profile rods, coating weight can be varied by change of depth. All coating
performances are of course depending on the following factors (Absorption, Colour
solid content, Viscosity, Hardness of backing roll, Rod dia., Nip pressure).
HS can offer the range of Rod dia. between 10 and 38mm. Plain Rods have generally
chrome plating and HS also can offer ceramic coating Rods for longer life.
The materials of Beds are mainly PE and PU. PU has more elasticity and PE is
stronger abrasion property. The future tendency of Bed material will be PE. Further,
due to extrusion system, manufacturing cost of PE Bed will be reduced.
As to surface sizing, plain Rod is common use. For starch liquid application,
plain Rod is not suitable. The profile Rod should be used for this application.
As to pigmenting, plain Rod with longer dia. is applied. The range of dia. will
be between 20 and 38mm.
In order to minimize running cost, HS starts to supply "COMBI-SYSTEM".
The advantage of this system is to minimize cost of Rod Beds. The replace part
is not complete Bed but only the part around Rod, which we call Rod Bed. We can
expect to reduce the cost of Bed up to 50% or at least 30%.
The Development of Defoamer for Kraft Pulping Process
Research & Development Dept., SAN NOPCO LIMITED
Black liquor made in the kraft pulping process contains various surfactants
derived from modified lignin. That means black liquor tends to make foam so easily
that the process is troubled with foam at any time. If amount of foam was broken
out, the efficiency of brown stock washer would decrease and the whiteness of
pulp would be under the standard level. Furthermore, operation speed of brown
stock washer would lower, which means the efficiency of pulp manufacturing would
decrease. Though the foam trouble can also be prevented mechanically, chemical
method using the defoamer is mainly adopted in the kraft pulping process. We
present the characteristics of new silicone type defoamers, and their applications.
Maximum Elastic Stress for Squar Tubular Case of Corrugated Fibber board Box
Shape under Uniform Compression (On Anisotropic Panel)
Guest Professor, Research Center of District Corporation, Ehime University
Professor Emeritus, Ehime University
From elastic stress formulation obtained by previous paper, elastic stress analysis
was performed for square Tubular case (CFBS: anisotropic panel) of corrugated
fibber board box shape (width L, height h) under uniform compression py0. Then
maximum values (σxmax, σymax, τxymax) for normal stresses σx and σy to width
and height directions and shear stress τxy were obtained by the formulation,
and characteristic behaviour for σxmax, σymax and τxymax were discussed. And
maximum principal stress σ1 and shear stress τ1 were obtained and their maximum
σ1max and τ1max were discussed.
σxmax is constant (νxypy0) for changes of Poisson's ratio νxy (effect to x direction
deformation for y direction deformation), L, h and x and y direction elastic
longitudinal elastic moduli Ex and Ey. σymax migrates from ranges of upper and
lower edges to centers in upper and lower edges, and from their centers to panel
plane centers with increases of L and h. τxymax migrates in narrow ranges about
corners with increases of L and h. σ1max migrates from corner vicinity to positions
of distance h/8 from upper and lower edge center, and from their positions to
panel plane center vicinity. τ1max migrates from corner to plane centers and
next from plane centers to corners. σymax, σ1max and τ1max increase and decrease
slightly with L and h, and increase slightly with Ex and νxy increases and decrease
slightly with Ey increase. τxymax decreases and increases with L and h increases
and increases with νxy and Ex increases, and decreases with Ey increase.
Keywords: Elastic Stress, Sqar Tubular Case, Corrugated Fiber Board Box Shape,
Uniform Compression, Anisotropic Panel