PROBLEM TO BE SOLVED: To obtain a measuring method in which viscosity of a sample in a low shearing rate region can be measured precisely without requiring a high cost spring relaxing viscosimeter. ;SOLUTION: A spring rotary viscosimeter is used, and its driving shaft 2 is turned at low speed by a motor 1. When the rotation of the driving shaft 2 is stopped, a pointer shaft 4 which is provided with a rotor 3 is returned slowly by the spring 5. The viscosity of a sample is computed on the basis of the change in the angle of rotation θ (a pointer angle θ) at this time. In a data analytical algorithm, data in which the speed of rotation (n) of the rotor 3 is 0 is searched out of data on the pointer angle θ of the spring rotary viscosimeter and data on the speed of rotation (n) of the rotor 3, and a spring relaxation analysis is performed with reference to the data.;COPYRIGHT: (C)1999,JPO
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