ALIPHATIC POLYESTER STRETCH-MOLDED OBJECT AND PRODUCTION THEREOF

摘要

PROBLEM TO BE SOLVED: To produce a biaxially stretched molded object made of aliphatic polyester eliminated or reduced in the anisotropy of mechanical strength characteristics and enhanced in gas barrier properties. SOLUTION: In a method for producing an aliphatic polyester stretch-molded object by the biaxial stretch molding of a preform of a resin based on aliphatic polyester, a negative gradient is provided to a stretching speed in the biaxial stretching of the preform so that an initial stretching speed becomes high and a final stretching speed becomes low. By vapor-depositing hard carbon film, gas barrier properties are also enhanced.