| 摘要 |
PROBLEM TO BE SOLVED: To provide a vacuum airtight container that can be securely closed air-tightly and can be easily opened and that is made of polypropylene which is free of environmental endocrine disrupter and less rigid. SOLUTION: A lid, a container main body, and a vent stopper are made of polypropylene that is free of environmental endocrine disrupter. Fastening devices are not designed so as to be pivotally attached to the lid or the container main body but are formed as independent parts. Three or more fastening devices are attached to the container main body with the lid placed thereon, thereby sealing the container air-tightly. By loosening the vent stopper, the lid can easily be opened. |
