Exact Mixture of Different Material Components
Barrel emptying systems pump silicone materials precisely without interruption
Silicone is a highly versatile material widely used in many industries and applications. It offers a combination of unique thermal, mechanical, chemical and electrical properties, making it useful in various situations.
However, silicones are versatile, and their composition and production are very demanding. NETZSCH Pumps & Systems offers innovative barrel emptying systems for precise metering of individual material components. Discover how to ensure an exact and uninterrupted mixture of the different material components by combining several barrel emptying systems.
Highest precision when pumping silicone components
The higher the requirements are in terms of the characteristics and high performance of modern materials, the more individual components have to be combined and accurately mixed to produce them. This means correct metering is essential and accuracy requirements of ±1 percent are not uncommon.
Challenges in pumping silicone components
Five different components have to be combined in the right mix ratio for silicone production, including a product filled with carbon black particles which is highly abrasive effect. The materials need to be taken out of 200-liter barrels and accurately metered with a pumping capacity of 25 l/m via three existing floor scales.
Pumping bakery products: Easy cleaning & highest hygiene standards
In this case, two of the five ingredients must be fed in larger quantities than the others. Therefore, NETZSCH installed three conventional barrel emptying systems with a NEMO® BH pump and two so-called twin models. These comprise two barrel emptying systems and can therefore be switched over to the second without interruption after emptying one barrel while the first is being replaced. The control of all seven units is bundled and arranged centrally on one interface. For you, this makes handling much more accessible. High-strength steel or robust elastomers have been used for all pumps for the rotor and follow plate, as well as for the stator and the levelling collar. Thus it is guaranteed that even the soot-filled product can be transported without increased wear on the system components. This ensures uninterrupted production, a long service life, and low maintenance costs.
Because two of the components have to be supplied in larger quantities than the others, NETZSCH installed three conventional NBE 200 barrel emptying units, along with two so-called twin versions. These each comprise two of the barrel emptying units and can therefore be switched over to the second barrel after emptying the first without any interruption, while the first one is being replaced. There is clear, combined control of all seven units via a central interface. High strength steel and robust elastomers are used on all pumps for the rotor and follow plate, along with the stator and levelling collar. This ensures that even the medium filled with carbon black can be transported without any increased wear on the system components.
The way the progressing cavity pump itself works also contributes to the long service lives of the barrel emptying units. The slim design with a small number of individual parts is less susceptible to faults than other conveyance technologies and in addition the material – particularly on the seals – is not put under such a heavy strain by the uniform rotation as it is by alternating lifting-lowering movements in piston pumps for example. The external components can also be easily removed for any kind of cleaning and maintenance work, which significantly reduces the length of any disruptions to operations. Together with ensuring high conveyance volume and uninterrupted metering even of larger quantities via the twin system, it was thus possible to reduce the processing time for individual production orders by around 50 percent. A silicone manufacturer has therefore been able to simplify the extraction and metering of their different basic substances and to roughly halve the production time.