Metal cap and bottle with cap

Abstract

Disclosed are a metal cap and bottle with a cap, which prevent a liner from falling out when the bottle is opened and enable smooth bottle opening and liner insertion. The metal cap (1) comprises a top plate section (2) disposed in the upper section, and a cylindrical section (3) that substantially hangs from the rim of the top plate section and seals an opening of a bottle after the liner (9) has been inserted onto the inner surface of the top plate section in a non-adhered state. The cylindrical section has: a vent hole (8) in the vicinity of the top plate section, that forms a slit-shaped opening in the peripheral direction and releases internal pressure when the bottle is opened; and a top protruding section (8a) and a bottom protruding section (8b) that are formed by bending the upper opening end and the lower opening end of the vent hole (8) inward in the radial direction of the cylindrical section. The end of the top protruding section is positioned further inwards in the radial direction than the outer rim of the liner when the liner is inserted and is also in the same position in the radial direction as the end of the bottom protruding section or positioned further outwards in the radial direction than said end.

Description

technical field [0001] The present invention relates to a metal cap for tightly closing the mouth of a bottle used for beverages and the like, and a bottle with a cap attached to the metal cap. Background technique [0002] Conventionally, in a cap attached to the mouth of a bottle made of metal such as steel or aluminum alloy, there is known a vent hole for releasing the internal pressure when the cap is opened by rotating the cap to release the gas inside the bottle body to the outside. (Also known as scoring slits or vent slits) are formed near the upper end of the cap. For example, Patent Document 1 discloses a cap comprising a cap body having a plurality of protrusions protruding from the inner surface of the skirt wall near the top wall; The gasket disposed on the inner side of the top wall is provided with a cut-in portion around the cover main body, and the cut-in portion is pressed to the inside of the cover to be bent to form the above-mentioned protrusion. In su...

AI Technical Summary

Problems solved by technology

That is, when the liner closely attached to the mouth of the bottle is not completely peeled off from the mouth of the bottle when the cap is opened, and the liner is pulled downward relative to the cap in the state of close contact, as in the technique of the above-mentioned Patent Document 1, When the gasket is locked by the lower protrusion of the vent hole, the outer peripheral edge of the gasket may catch the tip of the lower protrusion as the broken part, causing the entire gasket to warp. Detachment causing liner to fall off

In addition, even if it does not fall off, the outer peripheral part of the gasket rubs against the edge of the lower protrusion of the vent hole, so that a smooth feeling cannot be obtained when opening, and sometimes the gasket is slightly worn

Furthermore, in the technique of the above-mentioned Patent Document 2, if the spacer is inserted after forming the slit and the concave portion as the vent hole, the liner may be caught on the front end of the upper protrusion of the slit as the broken portion and become damaged. Unable to insert smoothly, or damage the liner due to friction

Therefore, it is necessary to form the slits and recesses as air vents after arranging the gasket on the inner surface of the top plate in advance, which takes a lot of time and effort in the processing process of the cap.

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