POLYESTER BOTTLE AND PRODUCTION THEREOF

摘要

PURPOSE:To stably produce a polyester bottle not having a flaw such as appearance deficiency or hermetical seal deficiency in its bottle mouth part with high productivity without frequently cleaning a preform injection mold while reducing the closing tendency of the air vent part of the injection mold. CONSTITUTION:In the injection molding and stretching blow molding of a thermoplastic polyester resin, as the thermoplastic polyester resin, ethylene terephathalate type polyester with intrinsic viscosity of 0.6-1.4dl/g and cycle (ethylene/ethylene oxyethylene.diterephthalate) content of 80ppm or less is used and the content of cyclo (ethylene/ethylene oxyethylene.diterephtalate) in a bottle is set to 100ppm or less.