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Messkopf_NLIn the course of revising OnV FeltView, an analysis system for press felts, improvements were made to both the design and software. The new version thus requires less installation space and can be used in paper machines with even the tightest available space. Along with the noticeably more compact shape of the cross member and the measuring head, the dimensions of the supply cabinets were also reduced to less than half of the original space requirement. Moreover, the new cross member is more accessible and thus easier to service. Another benefit is the modular design of the system with up to four cross members.


The OnV FeltView control software is integrated into the latest Voith Paper Automation software architecture and is thus Web-based. It can also be operated directly via Internet Explorer 8 without additional software.


At the beginning of May 2011, the first press modules were equipped with the OnV FeltView system at the Paper Technology Center in Heidenheim. The tests in the press section were thus also more transparent for the customer. In addition, safety is increased for employees, since manual measurements are no longer necessary.

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Thursday, 21 July 2011 08:57

SynStron for high performance dryer fabrics

Synstron1Contaminated roll surfaces, paper wads, heat and moisture – a real challenge for the polyester (PET) monofilaments of a fabric in the dryer section. SynStron is a new class of PET, developed by Voith for higher resistance to damage and abrasion under demanding running conditions.


A record life of 446 days has been achieved with SynStron monofilaments in a PrintTech Q2 fabric on the Third Top DuoRun of a 1,300 m/min coating base machine. This is a 30% improvement over the standard PET fabrics that are normally removed after 12 months at a planned shut. Seam strength was still high at 72% of its original value. Effective sheet control throughout the fabric life has been helped by the contaminant release additive of SynStron achieving 76% fabric permeability retention.


SynStron monofilaments have higher strength and abrasion resistance; fibrillation resistance to reduce the effects of degradation and a contaminant release additive. These advantages give a better potential to improve dryer fabric performance.

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Thursday, 21 July 2011 08:54

Less damage due to SpeedRod M

voith_pic1Again and again, coating units are affected by damaged hoses, resulting in hose changes and rather long unplanned downtimes of the paper machine due to inaccessible clamping areas for the metering unit. With the new SpeedRod M metering-rod bed generation, damaged hoses can be avoided to a large extent thanks to simple, preventive checks. In addition, the time needed for an unplanned hose change is reduced by more than 90%.


The supporting plate is the integrated holder for metering rod, clamping and loading hoses and can be used repeatedly. Clamping and loading hoses are identical: ready-to-use and pressuretested hoses with end areas additionally secured against overload by shrink hoses. The new metering-rod bed design provides the following advantages for the papermaker: The individual components can be checked preventively and replaced outside the coating unit, if required. Production losses in case of damaged hoses are reduced to a minimum, since a hose change only takes five minutes (instead of e.g. 60 minutes with the previous system). Only one hose type is used both for clamping and loading. Thanks to ready-to-use, pressure-tested hoses, downtimes are reduced. The metering-rod bed is a wear part and can be exchanged independently of the supporting plate.


Conclusion: SpeedRod M reduces the time needed for changing a hose to five minutes. In addition, unplanned changes can be avoided to a large extent by easy, preventive checks of the hoses.

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Monday, 18 July 2011 09:00

Stora Enso orders new testliner machine

In June 2011, Voith Paper received from Stora Enso the order for the supply of a new paper machine for the production of testliner. The location of the production line will be Ostroleka, approx. 120 km to the north of Warsaw, Poland. With its new PM 5 Stora Enso wants to meet the increasing demand for corrugated board and ensure the competitiveness of its location. The start-up is scheduled for the first quarter of 2013.

 

At a wire width of 8,600 mm and a design speed of 1,800 m/min, the Narew PM 5 will produce 455,000 metric tons of testliner per year. The new paper machine is especially designed for the production of lightweight testliner in a basis weight range of 65-140 g/m2. Storas Enso's focus of this investment was on low operating costs as well as a resource-efficient overall concept above all.

 

Voith Paper supplies the entire paper machine from headbox to winder. A particular highlight is the new DuoDryer CC which will be installed in the Narew PM 5 for the first time. It permits symmetrical drying with a continuously closed web run. Light and low-tension papers can be produced at high speed and efficiency with it. Furthermore, a VariFlex winder is included in the scope of supply.

 

In addition to the OnQ ModuleSteam (steam box) and the OnV ConditionMonitoring (machine monitoring system), the automation package also includes the new OnV EnergyProfiler software. It visualizes the energy consumption of the paper machine and thus permits energy cost saving production. A quality control system with two Voith LSC Scanners supplements the package.

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Hainan PM 2, the largest paper machine in the world, is running since May 2010 with CarboTec rolls of Voith Paper. Amongst others, CarboRun CS rolls are included in the scope of supply and are used for the so-called Center Supported Rolls (CSR). They have a positive influence on the fabric performance. PM 2 is located on Hainan Island in the South China Sea and producing high-quality multi coated fine paper.


Voith CarboTec rolls are made of carbon fiber reinforced plastic, known as CFRP. The carbon fiber material in this application can exploit its benefits: low weight, low energy consumption and low vibration tendency leading to high stability and no susceptibility to corrosion. CFRP rolls were developed in order to guarantee optimal reliability and excellent vibration resistance. In general, CFRP shows its full potential on fast machines as vibration is minimized. Compared to steel rolls CF rolls are 40% lighter, reducing loads on the framing, which in turn, has a positive effect on the vibration level.


With the Hainan PM 2 installation, Voith CarboTec rolls prove their benefits in one of world's most demanding applications and score twice: with a long service life and a safe operation.

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Thurpapier Model AG in Weinfelden, Switzerland, has been using the thermally-coated wire guide roll CeraGuide B by Voith Paper for more than a year in the forming section of PM 2 with very positive results.


The fabric wear has been significantly reduced and thus improves fabric life. At the same time the roll cover wear is less and the profiles are more uniform. The high stability of the guide roll CeraGuide B leads to consistently good profiles and operating performance.


"The positive experience with the guide roll has convinced us to also test a Voith Paper thermally coated roll cover for the breast roll", commented PM 2 production manager Robert Fehr. Therefore, the existing rubber cover of the breast roll was changed to CeraGuide P Plus.


By increasing the production rate of PM 2 which produces fluting and packaging papers, Thurpapier benefits from the cooperation with Voith Paper Fabric & Roll Systems.

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The paper manufacturer Cartiere del Polesine commissioned Voith Paper Automation with the delivery of a new quality control system (QCS) for the BM 4 at the Cavanella Po plant in Italy. The OnQ Profilmatic basis weight CD profile control with the associated OnQ ModuleJet actuator system that are currently installed will be expanded to include the OnQ Profilmatic moisture CD profile control for controlling the nozzle moisturizer installed by the customer. This will therefore ensure the required quality for the basis weight and moisture CD profiles of the machine. Two Voith LSC scanners, 5.60 m and 6.50 m wide, are also included in the delivery. They will have four sensors in total. In addition, the automation system will be expanded to include OnQ GradeControl MD controls for basis weight and moisture. The new QCS should be installed by end of December 2011.

 

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On the BM 3 in the same plant, stable basis weight CD profiles and short setting times (until achieving the guaranteed quality values after stoppages, grade changes or breaks) are also to be accomplished. In the future, the OnQ ModuleTap at the headbox will ensure this. The automatic control system is especially suitable for retrofitting existing headboxes from various manufacturers on which there is no dilution water system.


In addition, Cartiere del Polesine has chosen to conclude a service contract with Voith Paper Automation for both machines. Within the framework of the "remote diagnostics" service module, the package allows a remote diagnostic service of the automation systems used, if the customer so desires. A Voith Paper Automation service employee logs into the system of Cartiere del Polesine via an online connection and in this way can check the current status and eliminate malfunctions or carry out optimizations, if required.


The service module also includes 24/7 telephone support by the Voith service team. This guarantees very short reaction times and allows Cartiere del Polesine to get competent advice and support any time it is necessary. The service contract will come into effect in July 2011.


Back in 2007, Voith Paper Automation had equipped the BM 4 with its OnQ Profilmatic moisture CD profile control and the associated OnQ ModuleJet actuator system. This follow-up order is now the best proof that Cartiere del Polesine considers Voith Paper Automation to be a reliable partner. The automation upgrade has been planned in close collaboration with both teams and precisely adjusted to the needs and the available budget.

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"Due to the fast and uncomplicated assistance of Voith Paper, we could re-start production in record time after this scheduled downtime. The high flexibility of Voith Paper´s roll experts enabled us to get one of our suction press rolls completely serviced in this short time", stated Michael Hegemann, manager of technical operations in Stotzheim, Germany.


Voith tissue engineers worked through the day and night to seal the Yankee and to re-start production as soon as possible on Metsä Tissue´s PM 2. During the downtime, Metsä Tissue noticed some problems with the sealing of the Yankee cylinder.


Voith Paper and Metsä Tissue worked out an operation schedule to not only be able to seal the Yankee, but also to service the suction press roll in the Voith Service Center at the same time. The roll experts from Voith Paper were able to grind, balance and totally service the roll. During the service, they also noticed damage to the bearing housings and were able to replace them. The suction press roll was returned to the customer completely overhauled just two days later.


Re-installation of the serviced roll and the successful work on the Yankee allowed PM 2 to re-start production after only four days of downtime.


Metsä Tissue is one of Europe´s leading suppliers of tissue paper products to households and professional users. In twelve production units located all over Europe, Metsä employs some 3,200 people, doing a turnover of EUR 940 million. Metsä Tissue is part of the finnish Metsäliitto Group.

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A screen that uses less energy than all comparable products on the market has convinced the Technical Association of Pulp & Paper Industries (TAPPI). The Japanese Voith Paper subsidiary Voith IHI Paper Technology won this year’s Sasaki Award from the respected trade association for its development of the LP Screen.

The new technology, developed for the Japanese market, reduces specific energy consumption at the screening stage to 3-4 kWh per tonne of stock. For comparison, the best competitor product still needs twice as much specific energy.

The secret of the Low Power Screen lies in its construction. It uses the entire screen area to effectively separate accepted from reject stock, thereby improving quality and throughput. A circulation mechanism ensures that the consistency of the suspension is the same throughout the screen’s interior. Reject and accepted stock are separated and conveyed upwards via different outlets. Thickened and heavy reject is mixed with the inflowing stock, ensuring that the pulp has a uniform consistency throughout the entire screen basket.

In addition to its revolutionary low-profile the LP Screen can be combined with a high-performance C-bar screen basket with optimized slot distribution. This improves the efficiency and ensures that it is stable throughout the screen. Specific energy use can be reduced to a minimum and the quality of the stock is improved.

A significant contribution to the Japanese paper industry

The LP Screen is now the sixth development for which Voith IHI Paper Technology has won the Sasaki Award. The prize is awarded annually by TAPPI to Japanese papermakers who have made a significant contribution to the Japanese pulp and paper industry thanks to their technical developments or research.

27 LP Screens have already been installed at customer sites, two others are on the order books. After the break through of Voith Paper in the IntensaPulper development, the LP Screen is just another example how energy savings in the paper industry can be achieved.

Voith Paper is a division of the Voith Group and the leading partner to and pioneer in the paper industry. Through constant innovations, Voith Paper is optimizing the paper manufacturing process, focusing on developing resource-saving products to reduce the use of energy, water, and fibers.

Voith is setting the standard in the paper, energy, mobility, and service markets. Established on January 1, 1867, Voith currently has 39,000 employees, € 5 billion in sales, and over 280 locations worldwide and is one of the largest family-owned businesses in Europe.

Martin Schily

Tel +81 80 5521 8927
E-Mail This email address is being protected from spambots. You need JavaScript enabled to view it.

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High-quality kraft paper from the heart of Europe

Mondi* has made investments at its Štetí paper mill in the Czech Republic to provide top-quality packaging paper from the heart of the European market. The new machine-glazed paper machine supplied by Voith Paper is run by Vacon common DC bus modules and AC drives.

Mondi is a leading international paper and packaging group with operations across 31 countries. Mondi Štetí’s start-up of the PM6 in autumn 2009 was very successful. The new MG (machine-glazed) paper machine is designed to produce annually 55,000 tonnes of white kraft paper in the basis weight of 30-90 g/m2.

This investment was a logical step forward after the PM3 rebuild for white MG grades during 2002. With the new PM6, Mondi Štetí, Czech Republic, now owns two world-class MG machines side by side, strategically located in Central Europe to ensure outstanding delivery service and optimized supply-chain management. The PM6 further reinforces Mondi's position as a leading supplier of bleached, machine-glazed paper for the high-end packaging paper segment.


Vacon products - important tools for improving process and machine control

The new MG paper machine from Voith Paper was started up successfully in August 2009. Voith Paper’s scope of supply included a state-of-the-art head box, wire section, NipcoFlex press, MG cylinder, EcoSoft Calender, MasterReel and leading automation technology. The drive system application and drive control system were supplied by Voith Paper Automation.

Vacon supplied Voith Paper Automation with common DC bus modules and AC drives with a total power of 3.6 MW, providing seamless integration to Voith Paper’s ODC DriveSystem. The common DC bus modules, including non-generative front-end units, active front-end units and inverter units, control the motors of the PM6 and improve process control in terms of runnability, efficiency and quality. The auxiliary drives around the PM6 have also been integrated into machine control, and are controlled by the Vacon AC drives, thus enabling accurate motor controls.

Voith Paper provides solutions that improve the productivity and efficiency of the papermaking process. In a global cooperation agreement signed in May 2008, Voith Paper Automation chose Vacon as their preferred AC drives supplier for paper machine deliveries worldwide. “Reliable and versatile AC drives are an integral part of our solutions, and that is why we chose a supplier with an independent position and a large number of references in the pulp and paper industry,” says Antti Kaunonen, President, Voith Paper Automation. “The Mondi Štetí project demonstrated clearly that the integration of paper machine, automation and drives knowhow provides clear benefits for paper machine performance. This successful project shows that our chosen strategy is the correct one, and we shall continue with this strategy in the future,” Mr Kaunonen concludes.

Positive impact on the environment

Since cleaner production plays a key role in Mondi's sustainability commitments, the new investment was planned with the environment in mind. Despite increasing the volume of paper production in Štetí, the new PM6 machine will actually improve the environmental performance of the mill, with significant reductions in both water consumption and noise emissions.

The PM6 investment also has a positive influence on the surrounding communities by creating new jobs at the mill for highly qualified engineers, lab technicians and machine operators.

Vacon’s scope of supply to PM6


* Common DC bus modules in the power range 6 to 500 kW and with a total power of 3.6 MW
o 4 x Vacon non-regenerative front-end (NFE) power supply
o 1 x Vacon active front-end (AFE) power supply
o 22 x inverter units
* 40 auxiliary drives with a total power of 1750 kW and in the power range 0.3 to 630 kW

The NFE units are connected to a transformer with a 12-pulse supply system to achieve a low THD level.

Vacon’s common DC bus product portfolio meets all the requirements with a flexible architecture, comprising a selection of active front-ends, non-regenerative front-ends, fundamental front-ends, inverters and brake choppers in the entire power range up to 5300 kW at 380 VAC to 690 VAC. The drive components are based on Vacon NX technology. Common DC bus components are used in a wide range of combinations. In a typical DC bus configuration, drives that are braking can transfer the energy directly to drives in motoring mode.

The NFE (non-regenerative front-end) unit is a unidirectional (motoring) power converter for the front-end of a common DC bus drive line-up. The NFE is a device that operates as a diode bridge using diode/thyristor components. A dedicated choke is used at the input.

The AFE (active front-end) unit is a bidirectional (regenerative) power converter for the front-end of a common DC bus drive line-up. An LCL filter is used at the input. This unit is suitable for applications where low mains harmonics are required. AFE is able to boost DC link voltage (default +10%) higher than nominal DC link voltage (1.35x UN).

The INU (Inverter unit) is a bidirectional DC-fed power inverter for the supply and control of AC motors. The INU is supplied from a common DC bus drive line-up. A charging circuit is needed if the possibility of connecting to a live DC bus is required. The DC charging circuit is integrated up to 75 kW (FR4-FR8) and external for higher power ratings (FI9-FI14).

* Mondi is a leading international paper and packaging group with operations across 31 countries and an average of 33,400 employees.

Located in Štetí, on the banks of the Elbe River, 40 kilometres north of Prague in the Czech Republic, Mondi Štetí a.s. is a leading manufacturer of high grade sack kraft and kraft papers, as well as a major European supplier of corrugated case materials and market pulp.

The production of pulp at the site began in 1949, when the mill was called “Sepap”. Over the following decades the name and ownership of the mill changed several times. Today, Mondi Štetí a.s. annually produces 500,000 metric tonnes of pulp, paper and board of world-class quality that is sold on all continents.

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