| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To create a method for surely confirming a processing at a high temperature about a retort processing, especially a processing related to sterilization, and to provide a bottle body made of a polyethylene terephthalate resin easy in process control and particularly, capable of being used without anxiety in food application. <P>SOLUTION: The bottle body made of the polyethylene terephthalate resin by a biaxially oriented blow molding in which an undrawn part of the central part of the bottom face is whitened by crystallization by heat treatment after a content liquid is filled, is provided. A method for controlling the manufacturing process of a product is characterized in that in a process for manufacturing the product having a heat treatment process after the content liquid is filled into the bottle body made of the biaxially oriented blow-molded polyethylene terephthalate, the whitening of the undrawn part of the central part of the bottom face of the bottle body by crystallization accompanying this heat treatment process is used as an indicator for confirming that the heat treatment is applied on the product. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
