| 摘要 |
A plastic closure retained by snapping over bottle neck bead has a closure cap (3) with a flat closing disk (2) whose lower side (4) has an outer ring (5; 5') that surrounds the bottle neck in the closed position and an outer sealing ring (6) that lies at least in part against the inner circumference of the bottle opening and acts as a sealing cap. Both rings (5, 6) are substantially concentric to the central longitudinal axis (7) and are shaped in a single piece on the closing disk (2). On its inner side (10, 10') opposite to its sealing surface (9; 9'), the inner sealing ring (6) has several stiffening ribs (11) that extend substantially parallel to the central longitudinal axis (7). These stiffening ribs (11) are designed as shaped parts (12; 12'; 12''; 12'''; 12'''') that apply an elastic retaining pressure on at least parts of the inner sealing ring (6) in its closed position.
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