| 摘要 |
PROBLEM TO BE SOLVED: To lessen dimensional change after heat development processing and improve planeness. SOLUTION: This supporting body is a biaxial stretching photographic supporting body with a polyester as its main body element and the thermal dimensional change rate at 120 deg.C 30 seconds is 0.001% or more but less than 0.04%. As a manufacturing method, the biaxial oriented polyester film is heat treated under the tensile force of 0.04 kg/cm or more but less than 6 kg/cm<2> under the temperature of 80 deg.C or more but no more than 200 deg.C. |
