PVC cable mass is usually compounded in two stages: hot/cold mixing in the powder phase, followed by compounding and pelletizing on a BUSS Kneader.
Compounding requirements can be summarized as follows. The plasticizers and other constituents like stabilizers, additives, fillers, reinforcements, flame retardants and others. are absorbed in the porous PVC grain and then must be systematically gelled, dispersively and distributively mixed, and agglomerated. This is all in compliance with well defined temperature limits. Custom-tailored property profiles lead to a wide variety of formulations, with efficient production in rather decreasing batch sizes.
The BUSS Kneader can make the most of its strengths profile at uniform, moderate and if necessary, adjustable shear rates. A range of output rates can be achieved on a given BUSS Kneader size according to the requirements of the customer.
In most cases all product variations can be covered with a universal shaft geometry designed to suit the formulations portfolio. Furthermore, the modularity of the entire system (shaft geometry, fittings, forming options, etc.) always enables adjustment to comply with different requirements. This is important for maximum security of investment.
With its low specific energy requirement for the most intensive mixing processes, simple volumetric scale-up, and maximum availability over a wide operating range, the BUSS Kneader within the BUSS PVC Cable Compounding Systems clearly remains first choice for compounding PVC cable mass.