Paper introduces ZeTrac? - the innovative way of bleaching.6
Metso Paper, Inc. (previously Valmet Corp.) is proud to
introduce ZeTrac, the improved HC ozone bleaching process.
of this new process started less than two years ago and is the
culmination of over one decade of accumulated Metso know-how
working with this technology. The first installation is now in
operation at Burgo Ardennes in Belgium. Two more mills have
already commissioned the new process, Oji Paper Nichinan in
Japan and VCP Jacarei in Brazil.The main benefit of the HC ozone
process is the opportunity to replace large amounts of chlorine
dioxide with ozone and maintain pulp strength. This will have a
significant positive impact on production costs. The ZeTrac
process is naturally very beneficial from an environmental point
of view as it means substantial reductions in effluent volumes.
capital outlay for the new system is considerably lower than for
earlier HC ozone installations. ZeTrac requires no refiner or
plug screw feeder and one washing stage is eliminated. This will
also significantly reduce both the operating and maintenance
costs of the system.
At the ATIP Congress & Exhibition on October 17-19, 2000 in
Bordeaux, the patented process was granted the "Prix
Spécial du Jury" in the ATIP Innovation Contest. Altogether,
the introduction of this system represents a major opportunity
for producers of both ECF and TCF pulp to improve their
efficiency and reduce the environmental impact from their mill
screening of chemical bagasse pulp at TNPL5
Heinrich Fiedler GmbH & Co. KG won a global tender at TNPL
for the "Supply of screening system for chemical bagasse
pulp". TNPL (Tamil nadu Newsprint & Paper Ltd.)
produces in Kagithapuram, India pulp from the by-product of
sugar cane ‘bagasse’, a premium paper mill in Asia known for
its productioin of various grades of writing printing papers and
newsprint using bagasse as its principals raw material. The
capacity required of chemical bagasse pulp was of 220 t/d at the
decker. The earlier system was to be revamped and the
centrecleaning stage was to be eliminated.
The most important objectives
of the project was to improve the screening quality, reduce the
shive content and optimize the power consumption. A two stage
screening system installed two primary screens with slot widths
of 0.25mm and a secondary screen with slot width of 0.20mm, all
screens of type HF500. Due to the high sand content in the
bagasse, two HD cleaners of type HF-MCL2700 (sand traps) were
installed prior to the primary screens, thus increasing the life
of rotor and basket. The accept of the primary screens are sent
to the decker and the reject of the screens is being fed to the
secondary screen, the accepts of the secondary screen are
forwarded to the decker and the rejects are drained.
The system is
operational since July 1999 and all the objectives as mentioned
above have been achieved well to the customers satisfaction. The
most striking achievement has been the superior quality of the
screened pulp and the optimized power consumption and the
improved runnability of the paper machine.
Fiedler is situated in Germany
and has 8 sales offeces in the Asia-pacific region (20 sales
offices worldwide). The company offers optimizations of single
screens as well as complete screening or cleaning plants. Cost
and energy savings, improved screening efficiency and better
runnability of the paper machine are few of the aims that
Fiedler is committed to achieve. The scope of Fiedler’s
services includes total engineering and supply of equipment’s
as well as spare parts, e.g. pressure screens, pressure filters,
ceramic centricleaners, HD cleaners, screen baskets / rotors for
the screens of any make. l
Paper Formation Analyser4
is a fully statistical description of how the paper is formed or
equivalently, of how the fibers are arranged. For a well formed
sheet, it is necessary that the fibers
-are as well dispersed as possible
-have a minimum of alignment or orientation
-have uniform consistency
-are uniformly distributed with respect to their length,
breadth & weight.
sheet characteristics are based on the physical properties of
the fibers, the fiber network structure and the orientation.
Variations in these properties cause changes in average basis
weight, opacity, porosity, strength, run-ability etc. Though
large-scale variations could be effectively controlled with
today's technologies, the problem remains tricky and difficult
to address local grammage variations (areas less than 1mm2) and
this non-uniformity affects the above-mentioned functional
properties to a large extent.
A formation Analyser that detects these small-scale defects and
variations is the most appropriate answer and researchers all
over the world have been working towards making this position a
reality. CEERI presents its indigenously developed and tested
instrument that utilizes advanced image analysis techniques
combined with the computing power of the personal computers to
make this analysis reliable.
illuminated viewing area.
Automatic & manual lamp intensity control to cover wide
Formation Index based on specific perimeter of
User defined floc size limits.
Rapid measurement over wide range of paper grades.
Zooming facility for : Processed & binary images &
Histograms, profiles & setup pages.
Windows printer support
MS-Access database for back volumes.
Factory settable sample area.
Software calibration facility.
640 x 480 pixels.
0.02 Grey levels.
Frame grabber with RS 170 input.
40x30mm2 sample area.
+/- 1 Repeatability error.
Current & accumulated data; Profiles; Histograms; Floc
features & more.
15 to 120 GSM sample range.
Optional up to 250
Standard quartz halogen lamp.
230V, 50 Hz power supply.
Supports wide GSM range.
Immune to external light variations
Supports single and continuous samples.
Highly reliable & repeatable measurement.
Numerical & graphical representation.
Paper (Valmet) to launch new paper
and board coating3
As the result of years of intensive development work and
customer cooperation, Metso Paper is now ready to introduce its
new OptiSpray coating technology to the market. This new process
for improving the coating of paper and board, and also printing
properties, cannot be matched by any other paper machine
manufacturer in the world.
coating process is based on a controlled, high-pressure spray
application of coating or surface size directly on to the
surface of paper or board without any direct machine contact.
The coating is simultaneously sprayed (atomized) at high speed
on both sides of the paper web.
achieves excellent coverage of the base paper. This is because
the spray application spreads the coating evenly over the paper
surface, uniformly covering uneven areas of the base paper with
an even coating layer of the desired thickness.
The process facilitates the
development of new paper and board grades, or the improvement of
coated-paper grades produced with traditional methods. For
example, OptiSpray can improve the quality of newsprint to the
extent that its surface properties are almost equivalent to
those of magazine paper.
benefits paper and board manufacturers2
The spray-coating station can be situated on the level of the
paper machine, in the normal way, or alternatively below the
paper machine in the basement, which will bring significant
space and cost reductions in machine rebuilds.
will also significantly lower running costs, as it is automated
and contains only a few consumables or components that need
regular maintenance. There is no need for the blades, rods or
backing rolls of traditional methods that cause runnability
costs are also reduced because the process allows for lower MD
paper strength. This makes it possible to use recycled pulp, for
example, as the raw material.OptiSpray can be used for high
speed coating. In tests conducted at the Technology Center in
Järvenpää, Finland, paper was coated at a speed of up to 2
500 m/min with the paper web moving at a phenomenal 150 km/h!
fastest production machines, supplied by Metso Paper, currently
achieve production speeds a little above 1 700 m/min (over 100
km/h).The process has been extensively tested. Machine
runnability, process operation or paper quality exceeded the
targets. This provides paper manufacturers with an opportunity
to achieve higher capacity utilization in comparison to present
paper coating technologies.
step forward in paper manufacturing 1
can be regarded as an extremely significant step forward in
coated-paper manufacturing technology. Numerous pilot runs and
trial coatings on various base papers conducted in cooperation
with paper manufacturers have exceeded expectations. A
development team in Metso Paper's Coaters and Reels unit
situated in Järvenpää, headed by Vilho Nissinen, has been
responsible for the OptiSpray technology.
the delivery of the first OptiSpray equipment for production
purposes are currently underway.
Metso Corporation is a global
supplier of machinery and systems for the process industry.
Metso’s core businesses are divided between Metso Paper (fiber
and paper technology), Metso Minerals (rock and mineral
processing) and Metso Automation (automation and control
technology). In 2000, the net sales of Metso Corporation were
EUR 3.9 billion, and the personnel totaled approximately 22,000.
Metso Corporation is listed on the Helsinki and New York Stock