Abstract
An experiment to analyze the process of mixing SBR and calcium carbonate and its plastication using kneader mixing, has been done by the so-called the design of experiment which makes use of orthogonal array.
It is proposed to use five characteristic values which arc obtained from mixing torque-time characteristics as data for the analysis, and to distinguish between a significant factor corresponding to mixing and plasticating process, and a negligible factor. In connection with the significant factor, its contribution was studied with the result which seems to be consistent with past experience at factories.
Meanwhile, it was tried to find an activation constant between calcium carbonate (surface non-treated) and SBR.
Activation constant (KN) and tensile strength (TS) of vulcanized rubber obtained by this means are expressed as follows;
TS=81.3KN-30.9 (KN=1.021.66)
