Voith Quality Control System (QCS) OnQuality
Voith’s Quality Control System (QCS) OnQuality is a smart and integrated concept to enable producers to gain control over production processes and product quality. It offers the opportunity to stabilize and optimize the product quality and the production process while increasing productivity and decreasing operation and maintenance costs.
The OnQuality.Scanners integrated either as an integral component of the OnQuality quality control system or as a stand-alone system with direct OPC connection to compatible process control systems. The reliability of this innovative measuring technology has proven itself in new world-class paper machines as well as in the replacement of older quality control systems.
- Standard O-frame for most applications
- Paper width up to 35’ (10.650 mm)
- Smaller standardized form factor versions available up to 12’ 6’’ (3.800 mm)
- Single side frame for narrow installation
- Flexible width up to 24‘ 7‘‘ (7.500 mm)
- Highest reliability in the industry
- Flexible application for all size paper machines
- SEB mounted directly to frame to reduce wiring
- Garage function to keep sensors clean (option)
Measurement plates and heads are highly standardized components that ensure a plug and play configuration of sensors.
OnQuality.Sensors are compact, robust and include state of the art technology. They include a smart sensor and comprehensive diagnostic functions and insure easy access for maintenance and system extension. Interfaces are easy to use. All sensors include the new processor board with powerful signal processing capacity and standardized communications.OnQuality.Sensors are compact, robust and include state of the art technology. They include a smart sensor and comprehensive diagnostic functions and insure easy access for maintenance and system extension. Interfaces are easy to use. All sensors include the new processor board with powerful signal processing capacity and standardized communications.
- Ash Sensor Fe 55
Contactless measurement of mineral content in a paper web using gamma ray absorption.
- Ash Sensor Fe 55 XRF
Contactless measurement of mineral content in a paper web using gamma ray absorption and additional XRF.
- Basis Weight Sensor Krypton 85
Contactless measurement of basis weight, designed for basis weight range up to 600 g/m².
- Basis Weight Sensor Promethium 147
Contactless measurement of basis weight, designed for basis weight range up to 180 g/m².
- Caliper Sensor Dual Air Bearing
Contactless measurement for accurate measurement of paper thickness.
- Caliper Sensor Light Touch
Contacting sensor for accurate, on line measurement of paper thickness based on magnetic reluctance through the sheet.
- Coat Weight Sensor IR Reflection
Contactless measurement of coat weight by the absorption of the reflected infrared light of a defined wavelength spectrum.
- Color Sensor 45°c:0°
Measures color, whiteness, brightness and opacity.
- Gloss Sensor 75°
Contactless measurement of gloss for machine-finished and calendered board and paper.
- Moisture Sensor IR Reflection
Measures moisture content single sided and contactless.
- Moisture Sensor IR Transmission
Contactless measurement of moisture content by the absorption of infrared light at four wavelengths.
- Moisture Sensor Microwave DS20
Measures moisture content via microwave technology.
- Tissue Sensor TecoSens
Measures moisture and fibre weight of tissue paper grades.
To overcome the boundaries of physical sensoric Voith offers several virtual sensor applications.
The measuring head is equipped with two sensors. A moisture sensor based on microwave technology determines the felt moisture on the basis of the change in the dielectric constant. This change is brought about by the quantity of water present in the felt. A permeability sensor measures the pressure difference between a water jet penetrating the felt and a reference pressure, thereby determining the permeability. The machine speed has no influence on the measurement process. With OnV FeltView, felt conditioning is optimized, energy is saved, and felt wear is reduced.
OnV FeltView is used in the press section, and it was recently optimized for the special requirements of hygienic paper production.
With multi-ply wire sections, couching is optimized by unambiguously defining the water weight for the individual plies. Radioactive sources, which are used in most handheld measurement devices, are also omitted thanks to the harmless microwave sensor system.
OnQ FormingSens can be used with almost all former types and grammages. The installation positions within the former can be arbitrarily chosen as long as the expected water weight is within the measurement limits.
OnQ.FormingSens forms the for the advanced process control OnEfficiency.Dewatering.
The measuring principle is based on a spectroscopic procedure that takes into consideration the special optical characteristics of the paper web and the dryer fabric. This results in no impairments in break detection, either in changing paper characteristics (moisture and basis weight fluctuations) or due to the aging and discoloring of clothing. Web breaks are also more easily detected. The measurements are processed with OnC WebDetect in a microchip, which compensates for outside light influences. The measurement signal is filtered, and trigger thresholds are precisely calculated and continuously adjusted.
OnC WebDetect is used in single-tier dryer sections.
High runability and clear production increases are the outstanding advantages of the OnQ ModuleSteam steam box. With especially easy maintenance, it offers an extraordinary potential to increase dry content and profiling due to its vaporization zones. By vaporizing the paper web and lowering the water’s effective viscosity in the stock, the OnQ ModuleSteam steam box increases the effectiveness of the press nip.
Due to its small space requirement, it can be easily retrofitted into an existing press section. The design principle of the OnQ ModuleSteam steam box allows the smallest widths of the profiling zones.
OnQ ModulePro with Profilmatic MP moisture cross profile control delivers optimal moisture results, even for simultaneous treatment of moisture cross profile, total moisture and curling. An optimal spray angle and ultra-fine drops of water produced by a finely atomizing dual-substance nozzle provide for uniform water absorption over the entire web. Higher quality paper at the reel or before the calender or coating unit improves winding at the reel, reduces breaks and allows a lower dry content at the reel or higher web speeds.
Depending on the installation location, OnQ ModulePro is used for moisture cross profiling, curl reduction or remoistening.
V30 upgrade nozzles
Nozzle replacement is easily done by screwing out the old mouthpiece of the nozzle and screwing in the new V30 upgrade nozzle from Voith. Both the spray beam itself and the control remain untouched. Replacement of the nozzle requires a detailed technical check in advance.
Control of the basis weight cross profile with OnQ ModuleJet is done by adjustment of the dilution water valves that are arranged over the machine width through the actuator system. The inflow of dilution water is exactly dosed by means of precise linear movement. In combination with the Profilmatic control software, the OnQ ModuleJet actuator system guarantees uniform basis weight cross profiles and provides for short engagement times after malfunctions. The optimal valve position is calculated by Profilmatic with the aid of various algorithms and adjusted by the actuator system.
The OnQ ModuleJet actuator system is used in headboxes with dilution water technology for cross profiling.
With ModuleTap, a consistently high basis weight profile quality is guaranteed by means of a rotary motion (0-90°) on the basis of the profiles measured. The combination of Profilmatic control software and the ModuleTap actuator system provides good and stable basis weight cross profiles and short engagement times until reaching the guaranteed quality values after downtimes, grade changes or breaks.
ModuleTap is used in headboxes where dilution water dosing is carried out via ball valves. The automatic control system is especially suitable for retrofitting headboxes from various manufacturers that have no dilution water system.
Control of the cross profile with the ModuleStep is done through mechanical profiling by zones of the headbox aperture, using stepper motors. The resulting contoured headbox outlet corrects the cross profile in the desired manner. The adjusting unit - consisting of stepper motor, gears, micrometer and hand wheel - was specially designed for the harsh environmental conditions in the paper and board industry. Adjusting increments of 0.6 micron ensure good control quality. Each actuator includes an integrated status and diagnostic display. The actuator adjustment is precisely measured by means of position, protectingthe aperture of the headbox from damage.
ModuleStep actuators can be installed on all headbox types. They are especially suitable for retrofitting older headboxes.
Cross direction control with OnQ ModuleCoat / OnQ ModuleSpeed takes place via adjustment by zones of the profiling device. For this, the actuator is equipped with an incremental and absolute encoder. The additional position feedback provides absolute reliability for protection of the profile rail. The auto-mapping function of the Profilmatic control automatically checks the correlation between actuator position and measurement position in the paper web. This allows uniform distribution of the coating color. The "mapping model" adjusts to the measured change.
- Optimized moisture during grade change through model based steam control
- Minimized breaks and enhanced runability due to better moisture control during grade change
- Fast weight and ash grade change through control of stock- and filler flow
OnQuality.Profilmatic determines the shape of the profiles using quick and precise unfiltered, high-resolution profile measurements. Its ability to determine the portion of random noise in the measurements and the genuine cross profile variation makes the traditional filtering method for processing measurements obsolete.Continuous, dynamic profile mapping allows exact local mapping of the actuator control zones to the profile measurements.
OnQ WetEndControl is available for application in retention, gas and charge. To stabilize retention, OnQ WetEndControl measures the white water consistency and controls it by dosing the retention agent. OnE WetEndControl for gas controls the addition of deaeration chemicals on the basis of the dissolved or free gas content. The added amount is reduced to what is absolutely required, which in turn minimizes the effect on other chemicals. OnQ WetEndControl for charge controls the dosing of the fixing agent based on the cationic demand by measuring the amount of anionic material in the stock.
OnQ WetEndControl is used in the approach flow system to control chemicals, thereby improving their efficiency.
Decor paper specialist Ahlstrom-Munksjö modernizes its quality control system with ComCore
To lay the foundation for the digitization of your mill integrate your QCS into OnCumulus – the Voith cloud solution.
Decor paper specialist Ahlstrom-Munksjö modernizes its quality control system with ComCore
With the OnPerformance.Lab we offer expert remote consulting, audits and troubleshooting to improve your papermaking processes based on your QCS data.