| 摘要 |
1,024,762. Closure caps. WICANDERS KORKFABRIKER A.B. Oct. 2, 1962 [Oct. 3, 1961], No. 37310/62. Heading B8T. An integrally moulded plastics material closure cap comprises a skirt 1, a top wall 2 and a central circular sealing portion 3 comprising a hollow upper part formed integrally with the top wall concentrically within the cap, the upper part extending away from the top wall in the same directions as the skirt for engagement with the mouth of a bottle, the portion 3 further comprising a conically divergent terminal extension which has originally been made outwardly divergent away from the top wall immediately after moulding, and which is turned to be outwardly conically divergent towards the top wall with its periphery under internal tension which presses the terminal edge of the extension into sealing engagement with the top wall to define a completely enclosed annular space between the top wall and the portion 3 with the cap removed from the bottle. The cap, which is a screw or snap-on type, is preferably made by injection moulding from polypropylene and then folding back the extension by a plunger.
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