Compounding systems for Soft PVC

The creation of PVC from vinyl chloride (VC) was first described during the first half of the nineteenth century. Large-scale PVC production started in 1928 in the USA and 1930 in Germany. By the time the Second World War ended, it was already the most-produced plastic. With a chlorine content of 56.7% molar mass, PVC is a welcome co-product in chlorine production. Due to their low content of hydrocarbon-based components, PVC materials have a comparatively favourable energy balance and carbon dioxide footprint.

With plasticizers and other additives, the characteristics of PVC materials can be customized according to application requirements.

From the mechanical point of view, these plasticizers can be regarded as “hinges” or “spacers” from the neighbouring macromolecules. The larger the plasticizer molecules, the lower the migration rate under extreme loading.

Soft PVC (PVC-P) in general is produced in the compounding system by hot/cold mixing in the powder phase followed by compounding and pelletizing on a Buss Co-Kneader for all subsequent processes requiring a pellet or granulate. The substantial content of plasticizers, stabilizer packages, and in many cases, high fillers content as well, demand targeted and precisely controlled processing.