METHOD FOR INSPECTING MULTILAYERED PREFORM, MULTILAYERED BLOW MOLDED CONTAINER OR MULTILAYERED MOLDED ARTICLE

摘要

PROBLEM TO BE SOLVED: To provide a method for inspection precisely inspecting arrangement conditions of respective resin layers constituting a multilayered preform or a multilayered blow molded container by a simple and rapid method. SOLUTION: The method for inspection comprises immersing the multilayered preform or the multilayered blow molded container which has a structure which keeps an aliphatic polyester resin layer as an intermediate resin layer filled between inner and outer resin layers consisting of thermoplastic aromatic polyester resin layers into a liquid with a refractive index measured in a temperature range of 10-30°C in a range of 1.37-1.70 under a temperature condition for keeping the refractive index of the liquid in a range of 1.37-1.70, and then inspecting the arrangement conditions of the respective resin layers through the liquid with which the multilayered preform or the multilayered blow molded container is immersed. COPYRIGHT: (C)2008,JPO&INPIT