Stock mixing and dosing
Higher paper quality thanks to outstanding stock homogeneity at the headbox
Voith systems in the approach flow section provide efficient thick stock blending and homogeneous dilution of thick stock with the white water. Our solutions can be used in machines from Voith as well as from other manufacturers and meet the highest quality requirements – even for a wide range of grades or production of specialty papers.
Mixing and dosing systems for all applications
The design of the HydroMix, optimized by means of CFD analysis, ensures an optimal velocity profile from the white water channel to the mixing area. The execution as an acceleration elbow prevents vortex formation and dead zones. The design also allows for a compact construction. In combination with the patented nozzle with optimized design, the new HydroMix generation guarantees the best possible mixing of the stock for a stable basis weight profile. The automatic adjustment function of the nozzle thereby ensures a uniformly high sheet quality.
Maximum flexibility thanks to greatly expanded operating window
The revised nozzle design for the fiber stock feed-in permits a very wide operating window. This is especially beneficial for customers in the packaging paper segment, where the same machine is used to produce a large range of basis weights. With its automatically adjusting nozzle, HydroMix always mixes the required amount of fiber into the white water under optimal flow conditions to achieve a uniform sheet appearance.
The mixing nozzle is adjusted fully automatically from the control room. Based on the production output and the paper grade, an optimal nozzle opening is selected to ensure optimal distribution with minimal energy input. Precise pressure sensors measure the liquid level and can estimate the concentration of free gas. As a result, the defoamer additive can be accurately dosed and optimized, in turn resulting in lowered operating costs. The cleaning of the white water channels is another automated process. Cleaning nozzles are switched on at intervals and cover the entire white water channel with rotating jets. This provides for maximum cleanliness and consequently leads to fewer web breaks.
Your benefits with HydroMix
- Outstanding stock mixing for improved paper quality
- Maximum flexibility thanks to greatly expanded operating window
- Lower pressure drop for energy savings at high-consistency stock pump
- Compact design with acceleration elbow saves space and building investment costs
- Operator-friendly concept thanks to high degree of automation
The heart of the ComMix system is a static mixer. Static mixers are established in the chemical industry and are characterized by a very high mixing efficiency and low space requirements. Voith developed the concept further for the needs of the paper industry and uses mixing elements that have been optimized for fiber-containing suspensions and simultaneously prevent blocking by fiber bundles.
The Voith ComMix system creates the conditions required for homogeneous stock quality at the headbox by reliably mixing the furnish components and, thanks to a low volume, responding well to regulating adjustments.
Your benefits with ComMix
- Outstanding mixing quality for optimal process stability
- Blockage-resistant mixing elements for guaranteed higher machine availability
- Lower maintenance requirements because no wear parts in static mixer
- Compact size for flexible installation and energy savings
Efficient dosing in the approach flow system or the wire section results in significant reduction in chemical, fresh water and energy consumption. In addition, dosing with FlowJec leads to improved paper quality and runnability of the paper machine.
Your contact – How can we help you?
Global Product Manager
t +49 7321 37 2967Send an email
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