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Flow Visualization of the Rubber Compounding Cycle in an Internal Mixer based on Elastomer Blends

Abstract A flow visualization study of the blending of elastomers and the subsequent mixing of carbon black and oil in an internal mixer is described. The elastomers studied were natural rubber, cis-polybutadiene and a solution styrene-butadiene copolymer. Studies were made of addition to the mixer of mini bales of earch rubber pigmented with different colors and their subsequent homogenization. Subsequently we investigated the blending of bales of the different rubbers and determined the homogenication times. Similar investigations were made of the addition of carbon black and oil black homogenization times and oil absorption times were determine. These are correlated with the rheological properties of the elastomers.