The best of the Utilities for the MasterbatchesOn July 2, 2019 by Marshall Appelgren
Most of the coloured soot obtained from the kiln process is characterised by a high surface area, low bulk density and typical humidity. These properties, in essence, determine the tasks of compounding: soot particles, which, based on physical forces, tend to form aggregates or agglomerates, should separate in the process of compounding. Used directly in Buss Co-Kneeters, mixing processes at moderate shear rates, and the corresponding relaxation phases, lead to excellent distributional mixing results.
At the same time, shear rates are sufficient to achieve dispersive mixing with all kinds of aggregates present without damaging the substrate materials. Due to the possibility of dividing the soot fraction into several supply points, the possibility of trapped air and humidity intentionally volatilize, as well as actively degassing downstream, high-performance values with excellent quality can be achieved. For decades, many raw material manufacturers, as well as global technology leaders in the industry, have relied on the Buss Co-Kneeter system for processing black masterbatch .
The handling of masterbatch additives is an extremely wide area, as wide as the additives used for this and their principles of operation. Thus, specially targeted properties are achieved in the final product or implemented in the area of action. As an example, there may be mentioned masterbatches for protection against ultraviolet radiation, antistatic, anti-blocking, masterbatches technological additives for improving plastics processing or also flame retardant masterbatches.
The extremely wide range of requirements, which can come from high loads, various aggregative states of fillers, up to shear and temperature-sensitive initial and final products, requires the use of a universally applicable compounding system. The Kuster Buss is classified by leading expert bodies as a system with the best multifunctional qualities. Freedom of the system design also allows using specially selected configurations to specifically pay attention to changing requirements in the process zones.
Using a folding or rolling-away case, ease of accessibility makes possible radical production sequences with a high utilisation rate. The widely supported expertise of Buss processes makes Co-Kneeter Buss an excellent choice for compounding masterbatches.
Processing of masterbatch fillers is a specialised area for masterbatch production. Fillers are usually represented in the form of powdered substances, which with a high proportion should be available in the masterbatch in some places loading is more than 80%. Due to the bulk density, granulation and additional properties of the bulk material, they are difficult to process and require the use of special measures or compounding materials masterbatches. The masterbatch-filler can be treated during operation as a neutral granulate or diluted to the desired proportion of filler content in the final product.
Intensive mixing with low specific energy input
The latest generation BUSS multi-lobed compounders achieve a higher mixing efficiency with a lower total energy input of 15-40%. This is due to a large number of mixing cycles, optimally selected under the appropriate process zone. The energy required for melting is supplied almost exclusively mechanically dissipative in the form of sheer energy.
Intensive distributive mixing
The BUSS K-Kneeter provides intensive distributive mixing, since weaving of rotation and rotation around the axis of the mixing auger affects longitudinal flows and a large number of shear surfaces, and also creates mixing that goes beyond the channel.