| 摘要 |
PURPOSE: To reduce a tightening torque at the time of mounting a cap, in which an inside plug is incorporated, on a mouth of a bottle after filling the bottle with contents, and optimize an opening torque of removing the cap from the mouth of the bottle at the time of using the contents. CONSTITUTION: An inside plug 100 is incorporated in a cap 200, and a plurality of fitting protrusions 111, 112, which fit in a fitting ring 212 provided on an inner side of a side wall 110 of the cap 200, are provided at equal intervals in a horizontal direction on an outer side of a lower part of the side wall 110 of the inside plug 100. A plurality of fitting protrusions 111, 112, which fit in the fitting ring 212 provided at an upper part of a neck 310 of a bottle 300, are provided at equal intervals in a horizontal direction on an inner side of the side wall 110 between the plurality of fitting protrusions 111, 112. |
