| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lid material capable of being opened and closed many times, having a shape-keeping function, restorability and the like to maintain an open state and a closed state and capable of being operated even with a single hand, and to provide a packaging vessel having the lid material and self-standing ability. <P>SOLUTION: The lid material for packaging the food has a margin 11 fixed to the outer circumferential margin of an opening of a food preservation vessel 2, an opening 12 that can be opened and closed of the area surrounded by the margin, a seal part 13 of the area surrounded by the margin 11, and a boundary 14 forming a boundary between the opening 12 and the seal part 13. At least a part of the boundary 14 is curved so as to protrude to either one area of the opening 12 and the seal part 13 from the margin to the center, and is formed in either one shape of a level difference part, a groove-like recess and a ridge-like protrusion. The vessel has the lid material. <P>COPYRIGHT: (C)2012,JPO&INPIT |
