| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a polyester vessel which has mechanical strength, transparency and heat resistance in an opening rim section owing to oriented crystallization, and allows low-temperature heat sealing. <P>SOLUTION: In the polyester vessel, a projection 5 is formed on the top face of a crystallized opening rim section 4, and at least a prospective heat sealing surface of the projection is made amorphous or poorly crystallized. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
