All dosing pumps, precision volume dosing devices, dispensers, mixers, dosing systems or delivery machines are based on the endless piston principle and are used above all with adhesives, paints, soldering pastes and sealants, but also with cosmetics such as mascara and Vaseline, or in the food industry for filling sauces.
All media, which in certain cases can have a viscosity of up to 7,000,000 mPas, are conveyed and dosed practically free of pulsation and with an extremely low shear force. You will receive comprehensive advice for every application and extensive tests will be carried out for particularly complex challenges. Our dosing pumps and dosing systems are optimally adjusted to the application case in question, providing the best possible options for cleaning them in food applications, for example.
Our technology focuses on dosing, applying, filling, mixing or processing (degassing or barrel emptying, for example) a wide range of different products. Our core competence really comes to the fore with liquids or pastes which are high-viscosity, solids-laden, abrasive and sensitive to shear.
Endless piston principle
ViscoTec dosing pumps belong to the group of rotating displacement pumps. The principle of operation is comparable to an endless piston, which conveys the product from the suction end to the discharge end, thus building up a pressure difference.
At the heart of every application is a volumetric conveying dosing pump The interaction of a rotor with eccentric motion and a stator adapted to the conditions of the application results in conveying and dosing characteristics which correspond to an endless-motion piston.
Benefits of the endless piston principle
Due to the dosing geometry, a constant volume is always conveyed proportional to the angle of rotation per revolution. The conveying direction can be reversed by changing the direction of rotation. The volume is therefore unambiguously defined via the angular degrees.
Our technology provides a pressure-stable, linear head capacity curve of the pump. This enables a clear statement to be made regarding the ratio of revolution, time and discharge rate. So the pumps can be used in an application to dose a constant volume based on either time or revolutions. This fact results in a reliable dosing precision at the pump outlet of 1% (depending on the medium), which is often undershot in practice.
Another benefit is the conveying chamber produced, whose volume remains absolutely constant throughout the motion. As a result of this, solids-based media and even lumpy products can be conveyed and delivered.
Our pump technology provides additional benefits compared to other conveying mechanisms. For example, in over 95% of all applications there is no need for any filling and dosage valves at all, since a short reverse motion at the end of the dosing process causes threads to be broken off or prevents dripping.
Food, pharmaceuticals, cosmetics
The benefits for you
The hygienic filling, dosing or conveying of high-viscosity liquids and pastes with a high degree of process security makes great demands on the technology used. Thickness, dripping behaviour, any potential for thread formation and many more factors have to be taken into account. Particularly if the media to be delivered are paste-like, solids-loaded, lumpy, sensitive to temperature or shear, or sticky, conventional dosing systems quickly reach the limits of their performance. We dose your medium in a way that is gentle on the product, CIP/SIP can be performed, the dosing pump is easy and quick to dismantle, and all materials which come into contact with the product are FDA-compliant. Cold filling and hot filling can be carried out free of pulsation and the quantity is infinitely adjustable. No energy is transferred into the product.
One of our High-End Products is the ViscoTec Pharma Dispenser VPHD, a metering system / dosing system for the Pharma Industry for sterile metering and filling, to fill pharmaceutical, medical and biotechnology (eg medicine, juice, cream, salve, ointment, gel, perfume, sprayer filling), and filling food as a food pump (eg milk, ketchup, mustard, souce, jam, honey, yogurt, cottage cheese, aromatics, melted chocolate).
Reliable, accurate and reproducible dosing for process-dosing and filling systems for different viscosities – no problem for the new pharma doser “Pharma Dispenser VPHD” in hygienic design from ViscoTec.
Adhesives, sealants, paints
The benefits for you
In industrial sectors with extremely complex requirements and sensitive systems in particular, optimum adaptations, long service life and professional service are the basic prerequisites for secure production. What does an application system have to contain if it must accommodate the dosing and application of adhesives or sealants that are high-viscosity, abrasive and sensitive to shear, whilst tolerating changes in the flow characteristics of the media at the same time? It must also be possible to easily adapt it to networked control systems.
Our dosing systems work free of pulsation and in a way that is particularly gentle on the product. Our dispensers are characterised by a high degree of repeat accuracy in terms of quantity and high-accuracy dosing through the smallest dead spaces. No dripping thanks to adjustable suckback, no accumulation of product at joints, uniform caterpillar form even at a different traversing speed, dot dosing and bead dosing in one device and an infinitely adjustable dosing quantity are just some of the benefits offered by our technology.
Micro-dosing / micro dispensing
The benefits for you
ViscoTec dispenser are based on a completely pressure-tight displacement system, which is self-sealing and consists of a rotor and stator. The controlled rotary motion of the rotor causes the medium to be displaced in the stator and generates the conveying movement.
Since conveying can also take place in reverse, preeflow® ensures that the material or medium is broken off cleanly and in a controlled manner without dripping.
The system is designed to be self-sealing up to a discharge pressure of 2 bar with water. As the viscosity increases, so too does the inherent sealing. Dosing pressures of 16 to 20 bar can thus be achieved with no further effort. With high-viscosity media it is also possible to create a priming upstream pressure, making a pressure tank unnecessary for self-levelling liquids. Our micro-dispensers enable micro doses from 1 µl to be administered with a high degree of process security and a dosing precision of ± 1%, plus a repeat accuracy > 99%.