Patent ID: 7497129

Claim:
A rubber specimen-stretching jig comprising: a jig body having a disk-shaped pedestal; a columnar rubber specimen-fitting support, erected on said pedestal, whose diameter is smaller than that of said pedestal; and a columnar retaining ring-fitting support, projected from an upper end surface of said rubber specimen-fitting support, whose diameter is smaller than that of said rubber specimen-fitting support; and an annular retaining ring removably fixedly fitted around said retaining ring-fitting support, wherein said jig body is inserted into a cylindrical rotor, with one or more stretched annular rubber specimens wound around said rubber specimen-fitting support of said jig body; and with an inner surface of said rotor fixedly pressed against an outer surface of said pedestal and that of said retaining ring and brought into contact with said annular rubber specimens, a solid NMR of each of said annular rubber specimens is measured while said stretched annular rubber specimens are being rotated at a high speed by interlocking said stretched annular rubber specimens to said rotor rotated at a high speed.