Fig. 3 The relationship between the

Fig. 3 The relationship between the roller speed ratio and relevant parameters Key Engineering Materials Vol. 561 403As can be seen from Fig. 3(Fig. a), with the increase of the roller speed ratio f, Mooney viscosity of the rubber material presents a downward trend around the range of the preferred speed ratio. It can be seen from Fig. 3(Fig. b), with the increase of the roller speed ratio f, carbon black dispersion degree of the rubber material has an optimum value. Seen from Fig. 3(Fig. c, d, e), the effect of roller speed ratio f on the 300% stress at definite elongation, tensile strength, tearing strength, and other physical and mechanical properties exists an optimum value. It can be seen from the above experimental data that for this experimental platform, in the case of using all steel radial tire tread rubber ingredient, the optimum value of open mill roller speed ratio f is around 1.25. Within the scope of this best value, open mill mixing can get better mixing quality and also higher production efficiency. 2.4 The Effect of the Mixing Temperature on the Mixing Process