Abstract
Since the initial mixing state in the internal mixer is very complicate, to obtain the reproducible data about BIT taken as a measure of mixing operation difficulty has been regarded as difficult. As mentioned previous paper, the operating method of mixing which can obtain the reproducible data was established, so we investigated the each factor which affects BIT by using former method. Various carbon blacks, oil-extended rubber and oil were taken as a material. Rotational velocity and rotational ratio of rotor, fill factor and ram pressure were taken as a mixing condition. We attempted to investigate the effect of these factors on BIT by the new mixing theory based on the static electricity phenomena and rubber viscoelasticity.
