Patent ID: 8768662

Claim:
A computer-implemented method for calculating a shrinkage of a molding product, comprising a step of using a computer processor to calculate the shrinkage of the molding product from a molding fluid by taking into consideration an increase of a shear viscosity of the molding fluid by a decrease of a shear rate; wherein the increase of the shear viscosity of the molding fluid by the decrease of the shear rate is represented using an expression: η VE ( P ,{dot over (γ)})=exp( b ({dot over (γ)}) P ) where η VE represents the increase of the shear viscosity, {dot over (γ)} is represents the shear rate, P represents a molding pressure, and b({dot over (γ)}) represents the shear rate; wherein the shear rate is represented using an expression: b({dot over (γ)})=Σ n=1 N C n exp(−{dot over (γ)}/t n ) where C n and t n are constants.