| 摘要 |
PROBLEM TO BE SOLVED: To prevent a cap of a PET bottle from simply coming off and make the cap easier to be incorporated in a recycling system together with a PET bottle main body. SOLUTION: Protrusions are provided inside a cap and are fitted into grooves provided to a mouth of a PET bottle main body. As the material for the cap, the same material as that for the PET bottle main body is used. |
