JAPAN TAPPI JOURNALVol. 57, No.3
March 2003 Abstracts
Latest news about automation system from foreign country's references
Kiyoshi Dekula
Metso Automation K.K., Paper Automation Div.
When we started to produce "Paper" with machine. It’s control is
basically manual control or hand made ones. But as everybody can see, control/autiomation
system is totally different nowadays related with Paper Machine’s histories.
As everybody knows that Automation System defined DCS, QCS and MCS have so
long history since more than 40 years ago. In that period, there have been
many progresses, evolution and devlopment. Also Hardwares and Softwares are
changing.
Based on those histories, I would like to report the latest Automation System
defined by DCS, QCS and MCS based on acrtual references.
Before introducing those refernces, I would like to express my deel appreciation
for the people who advised, informed and helped me to make this report.
New Trials Surrounding DCS
Takekazu Takayama
Oji Paper Co., Ltd., Fuji Mill
In October 2001, an innovative board machine named N-2 started up in our Oji
Paper Fuji mill. The design of control system was discussed repeatedly
so as to handle this machine very comprehensively.
During its 25 years history, DCS has grown up and well matured. Nowadays,
it seems that there left only nominal differences between one vender
and another. On the other hand, many intelligent sensor systems
and information systems have also been developed around DCS. From
the viewpoint of plant operation, all the systems should be combined
and unified to serve operators like a single "seamless system".
We think that DCS is a nucleus in such system.
This paper introduces our basic idea of the control system of N-2. Whole the
scope of instrumentation system as well as some application of
IT is also discussed.
A New Information System for Paper Roll Handling
Takahiro Shigematsu
Kushiro Mill, Nippon Paper Industries Co., Ltd.
This paper describes the modifications incorporated in the information system
for the existing paper roll handling process. In order to share
production, marketing and inventory information between the headquarters
and each domestic mill, the paper roll tracking system was replaced
in Kushiro Mill. Since the previous system lacked memory, communication
bandwidth and expansion capacity, new PC system was introduced.
It has successfully consolidated various products information into
single database. The next phase is to expand this service to each
department by constructing company-wide LAN, and promotes the new
system capability to the headquarters.
The Performance of Sheet-break Monitoring System
Takaharu Yokota
Niigata Mill, Hokuetu Paper Industries Co., Ltd.
As a paper machines are larger and faster; even short-time sheet break causes
an enormous loss. When a sheet break occurs, it repeats frequently
for the same reason. Therefore, a prompt identification of break
reasons in early stage and working out countermeasures are of great
importance in improving production efficiency.
In this report, a subject is sheet-break monitoring system. A sheet-break
monitoring system, which is an equipment identifying a breaking
stage and reasons by observation camera, is expected to reduce
the sheet break.
Hokuetsu Paper, Niigata mill adopts three types of the sheet-break monitoring
systems. This report focuses on comparing functions and performances
of each system.
Integration of Control Rooms in the Power Plant and Kraft Pulp Plant by DCS
Akitosi Konno
Daishowa Paper Mfg. Co., Ltd.
To improve the productivity and to reduce the cost, Daishowa Iwanuma Mill
integrated contorol rooms in power plant and Kraft pulp plant to
the central control room respectively by introducing DCS. The project
was successfully completed in a short period the mill can spare.
This paper describes the contol system configurations and the
change of operations in both plants.
The Newest Technology of Detecting Streak and Line Fault-Algorithm of NASP-Multi 500 System-
Masayoshi Nakata
Techonology Development, Vision System Business DIV, OMRON Corporation
The measure that detects the streak fault in our company becomes about ten
years. As a trend of those days to the next of the Spot-fault inspection
system, we developed technology and products, and we developed
the Streak-fault inspection system that combined analog-processing
technology and special detection algorithm. In the performance
of detecting the streak fault, the improvement was continuously
achieved up to now. The feature of the streak fault is long, slender,
linear, and that the defective signal is a minute level. So, it
is beginning of the measure that we adopted the camera and detection
algorithm, which is different from these of detecting the spot
fault.
At present, using image-processing technology, we develop the detection algorithm
that suited the amount of the features of the streak fault, and
have released the products whose detection performance improved.
Furthermore, the detection algorithm has evolved by the needs of
detecting the scratch fault, the line fault, and the wrinkles fault.
Thus, it is sure that sensor technology has contributed to the base somewhat
to the demand or needs of the paper manufacture industry till present.
Advanced Technology for Streak Detection by Full-digital processing
Suzuki Satoshi
COGNEX K.K., Surface Inspection System Division
COGNEX developed a new web inspection system, "SmatView ICN". This
system has the following advanced technologies for streak detection. (1) 12
bit digitalization (4096 gray levels) and full-digital processing, (2) Superior
streak detection algorithm, (3) Reliable Defect Identification by over 40 defect
features. It allows you to detect scratch (short streak) and moving streak.
The Newly Developed Method Applied for Streak Defects Detection
Minoru Fujita
Vision Systems Engineering, System Components Dept.
Toshiba IT-Solutions Corporation
The combination of several defect detection channels which sensitivity are
optimized for different width and length of defects is verified.
The proposed width-length defect model enables us to fully understand
the characteristics of the capability of defect detection channels.
The image analysis results show that the detection channels can
enhance a streak defect.
Another important feature of defect detection is connectivity analysis, unification
and defect classification.
The newly developed web inspection system, M9000 utilizing these methods provides
various aspects of streak defect information to assist understanding
of the manufacturing process.
The Latest Technology of Detecting Streaky Flaws
Yoshinobu Sugino
Research and Development Dept., Futec Inc.
As has been the case, many requirements are made to the inspection system.
Even more diversified requirements are seen because of its possible versatile
applications. There are some industries in which , a short while
back, it was thought to be hard to apply automatic inspection,
but now because of more increased competition, some kind of automatic
inspection would be a most effective means to be apart from the
other competitors. The competition is not only among domestic but
world-wide and is by all means intensifying.
As to the overall performance, there are two critical points in focus.
The first is how to most effectively utilize the flaw data for the improvement
of product quality and production yield. The inspection system
was once regarded as a simple sensor, but the times have changed
now and is required to provide an opportunity to becoming more
competitive position in the market. The collected data is thought
to be even more valuable if it were shared among operators via
network. It would be further processed , like SQC analysis , to
bring in more benefit.
The second is , needless to say, the sensitivity itself. Market is going to
require defects detected which were used to be not required before.
The more sensitive means , more data is gathered.
It is crucial to make the system more efficient in handling vast flaw data
along with improved sensitivity. On top, how to most effectively
share that flaw data internally in order to achieve the better
result.
Here I describe briefly about how we can achieve the afore-mentioned balanced
performance.
Introduction of Defect Inspection Systems and Their Technology
Junichi Harada
Mitsubishi Rayon Co., Ltd.
Mitsubishi Rayon has been developing and offering the optical inspection systems
using the line CCD cameras, about 10 years. These are being used
for the manufacturing processes of the optical-film, the steel
or non-steel. In these fields, there is a demand to detect the
defects such as uneven surfaces and streaks, which can be finally
confirmed with the human eyes. Therefore, we have developed the
special image-processing technology to detect the defects accurately.
We introduce our image processing technology for the paper manufacturing
process.
Pressure Loss Calculation Software-2002
Shigeru Saito
KITZ Corporation, Sales Engineering Dept.
We would like to introduce you new pressure loss calculation software for
piping system, which is the renewed and updated version from one
of last year and easier to use. We would like to explain to you
mainly additional features from the previous one here, not the
same features. The previous software calculated fluid pressure
loss based upon virtual installation of valves and elbows on a
fixed piping system.
There had been some differences from the actual piping system with this way,
which sometimes created difficulties in handling.
The new software was programmed to solve this problem. You can design plane
and lateral drawings automatically by selecting piping materials
from the menu and calculate pressure loss by setting fluid conditions
at the piping system.
Thus, there is no restriction for number of piping system patterns. Users
can specify as many piping system patterns as possible.
Also you can check pressure losses at the specific locations by clicking mouse
at any points of the piping system. You can print out the whole
piping system to verify it clearly. We hope that this new software
will be of great help to you.
Automatic Friction Coefficient Testing Machine
Hirofumi Sagawa
Sagawa Seisakujo Co, Inc.
Automatic Friction Coefficient Testing Machine adapted to ISO 15359 is composed
of a main body and a personal computer instrument apparatus.
Installation of samples is more convenient by utilizing weight with clamp
mechanism. Automatic measurement will eliminate individual errors.
It is highly reproducible.
New Visual Inspection System of Paper & Film-Build "Ultra-high-resolution Visual-Inspection System" by TECHNOS Neuro-Vision5000K-
Yoshiro Yamada
TECHNOS JAPAN CORP.
The Paper Industry is known of very fast work speed as well as the cold mill
in the Steel Industry. The mass production of polarizing film and
diffusion film which will be the materials of the display device
is progressing by using the high speed production technology. TECHNOS
holds a world patent of anew technology systems. And we again developed
a visual automatic inspection system which has the best accuracy
in the world. This new system is buildup a function called Mini-Movement
of human eyes. Our new system is able to find the minutest defect
to a low-contrast spot. 10000m every minute in the high speed line
by only one camera. This new system has a accuracy of 1000 times
of a former CCD line camera (equal of 4000 pixels). As we developed
this marvelous system 5000K, we can deliver within 48 hours upon
receipt of an order and are able to install within 3 hours.
HBS pulping (5) -Chemical Structure and Properties of HBS Lignin-
Hideaki Nagaoka
Nippon Paper Chemicals Co., Ltd.
Yoshihiro Sano
Laboratory of Wood Chemistry, Graduate School of Agriculture, Hokkaido University
Chips of fir (T) (A. Sachalinensis Mast.) as softwood and birch (B)(B. platyphylla
var. japonica Hara) as hardwood were pulped by HBS pulping process
with fresh HBS of 1,4-butanediol and its recovered solvents (RHBS-1
and 2) prepared from spent liquors. HBS lignins (HL), that is,
BL-1-3 and TL-1-3 were isolated in yields of 90-150% based of chips
from the spent liquors of birch and fir, respectively. Furthermore,
HL was fractionated into ether insolubles (IS) and solubles (S)
to analyze. Each the lignin was subjected to elemental, spectral
spectrographic (UV and NMR), thermomechanical, gel permeation chromatographic
analyses, determination of
hydroxyl groups, and also nitrobenzene oxidation.
Keywords: Pulping with high boiling solvent, softwood, hardwood, lignin, chemical structure, softening point, average molecular weight
Manufacturing of Magnetic Papermaking Fibers and Paper ( PartⅠ)-Preparation of Magnetite-Loaded Pulps at their Lumen by in situ Synthesis-
Katsuhisa Fujiwara and Masaaki Morikawa
Paper Industrial Research Institute of Ehime Prefecture
Magnetic pulps loaded with magnetite (Fe3O4) in the pulp lumen were prepared
by in situ synthesis. The synthetic conditions for forming magnetite
includes the following three steps: a) dispersion of pulp in a
ferrous salt solution, b) addition of an alkali to the ferrous
salt, and c) air-bubbling. The main factors influencing the magnetite
formation were the added amount of the alkali to the ferrous salt
solution containing pulp, i.e. the pH value, and the successive
reaction temperature to form magnetite. Magnetite was formed in
the temperature range from 50 to 90°C, when the added amount of
the alkali was nearly equivalent to that of the ferrous salt present
in the pulp suspension. The alkaline addition level for magnetite
formation was expanded in the range from 0.6 to 4.0 equivalent
to that of the ferrous salt at the reaction temperature of more
than 90°C. The magnetite formed in the pulp lumen was observed
by means of a scanning electron microscope. X-ray diffraction analysis
of the magnetite formed in the pulp lumen showed that it had a
spinel-type crystal structure with cubic system, because its lattice
planes [311], [440] and [220] were detected at diffraction angles
2 of 35.4, 62.6 and 30.1°, respectively. The particle size of the
magnetite was 0.3m on average, and distributed in the range from
0.2 to 0.4m. The magnetite contents in the pulp were 23-33% (based
on dry weight of the loaded pulps). The magnetite-loaded pulp with
30.4% magnetite content had saturation magnetization and remanent
magnetization values of 16.3 and 3.6 emu/g of magnetite-loaded
pulp, respectively, and had a coercive force of 240 Oe.
Keywords: Magnetic paper making pulp, Magnetite-loaded pulp, Pulp lumen, in situ synthesis, Lumen-loading
|