For gumbase compounding, the recipe components have to be optimally mixed in the viscous phase. BUSS compounding technology is ideally suited for this purpose. In the first zone of the BUSS Kneader, the elastomers (PIB), as well as the rubber fractions, are present as liquids and they are melted or masticated via the dissipated shear energy of the kneader screw. In the second zone, fillers and resins are added and mixed. Synchronous dissipative and distributive mixing via the oscillating and rotating screw shaft are therefore particularly efficient in achieving these functions. The waxes, plasticizers and antioxidants are often present in liquid form and are fed to the process in the optimal position through hollow-drilled kneading bolts which can be positioned at many optional locations along the processing chamber. In the third zone, besides further homogenisation of the gumbase, rework material can also be incorporated. With a process length of only 11 L / D, unsurpassed product quality can be achieved, thanks to gentle compounding despite high throughputs. Due to the tight retention time spectrum and excellent self-cleaning properties, it is also possible to work with product changes on the fly, thereby optimizing availability and enhancing the economics of the process.
The resulting mass can now be further processed inline. For this purpose, it is usually pumped into a heated intermediate storage container. Alternatively, it can be made ready for further processing offline.