Patent ID: 6877362

Claim:
A method for evaluating a processability of a viscoelastic material, comprising the following steps: 1) a measuring step for measuring a complex viscosity modulus, by carrying out the following: I) varying a vibration frequency and a vibration amplitude at a given temperature range, and II) controlling a shear stress applied to the viscoelastic material which is mixed under a given mixing condition, the shear stress causing a reactive stress reacting to the shear stress, the measuring step for measuring the complex viscosity modulus being based on the reactive stress; and 2) an operating step for operating an apparent activation energy of the viscoelastic material, the apparent activation energy being given by the following expression: η*= A ·exp( Ea/RT ) where T is the temperature at the measuring step, R is a gas constant, η* is the complex viscosity modulus, and Ea is the apparent activation energy which is used as a predicting value for predicting the processability of the viscoelastic material.