Synthetic resin container closure
AssigneeJapan Crown Cork Co., Ltd.
InventorsYuji Kano, Hisashi Nakajima
Life of this patent
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Abstract
A container closure formed from a synthetic resin as a single unit has a circular top panel wall and a cylindrical skirt wall extending downwardly from the peripheral edge of the top panel wall. An outer cylindrical sealing protrusion, an inner cylindrical sealing protrusion, and annular sealing ridge, all having a predetermined shape and a predetermined size, are formed on the inner surface of the top panel wall. In one embodiment, the thickness of the center portion of the top panel wall is reduced to a predetermined range and a plurality of ribs having a predetermined thickness are formed on the inner surface of the center portion of the top panel wall.
Claims20
A synthetic resin container closure for closing a container having a mouth-neck portion with an external diameter D2 and an internal diameter D4, said container closure comprising:
- a circular top panel wall;
- a cylindrical skirt wall extending downwardly from the peripheral edge of the top panel wall and formed from a synthetic resin as a single unit with the top panel wall;
- an outer cylindrical sealing protrusion extending downwardly from the inner surface of the top panel wall and having a minimum internal diameter D1;
- an inner cylindrical sealing protrusion extending downwardly from the inner surface of the top panel wall and having a maximum external diameter D3;
- and
- an annular sealing ridge located between the outer cylindrical sealing protrusion and the inner cylindrical sealing protrusion and projecting downwardly from the inner surface of the top panel wall, wherein:
- 0.05 mm≦(D2−D1)≦0.60 mm, and 0.25 mm≦(D3−D4)≦1.50 mm, so that when the container closure is mounted on the mouth-neck portion of the container, the inner peripheral surface of the outer cylindrical sealing protrusion is in close contact with the outer peripheral surface of the mouth-neck portion, the outer peripheral surface of the inner cylindrical sealing protrusion is in close contact with the inner peripheral surface of the mouth-neck portion, and the annular sealing ridge is in close contact with the top surface of the mouth-neck portion.
A beverage container and closure, comprising:
- a container having a mouth-neck portion with an external diameter D2 and an internal diameter D4;
- and
- a container closure formed from a synthetic resin as a single unit and having a circular top panel wall, a cylindrical skirt wall extending downwardly from the peripheral edge of the top panel wall, an outer cylindrical sealing protrusion extending downwardly from the inner surface of the top panel wall and having a minimum internal diameter D1, an inner cylindrical sealing protrusion extending downwardly from the inner surface of the top panel wall and having a maximum external diameter D3, and an annular sealing ridge located between the outer cylindrical sealing protrusion and the inner cylindrical sealing protrusion and projecting downwardly from the inner surface of the top panel wall, wherein:
- 0.05 mm≦(D2−D1)≦0.60 mm, and 0.25 mm≦(D3−D4)≦1.50 mm, so that when the container closure is mounted on the mouth-neck portion of the container, the inner peripheral surface of the outer cylindrical sealing protrusion is in close contact with the outer peripheral surface of the mouth-neck portion, the outer peripheral surface of the inner cylindrical sealing protrusion is in close contact with the inner peripheral surface of the mouth-neck portion, and the annular sealing ridge is in close contact with the top surface of the mouth-neck portion.
Dependencies are inferred from the claim text.