| 摘要 |
The self-opener closure comprises a spout ( 2 ) having a projecting lower rim ( 9 ) which is to be moulded or glued to a composite packaging, an associated rotary cap ( 1 ) as well as a self-opener sleeve ( 3 ) arranged within the spout ( 2 ). This self-opener sleeve ( 3 ) can be made to rotate by the rotary cap ( 1 ). The inner side of the spout ( 2 ) is provided with four guide webs having varying inclines arranged over its inner circumference. These interact with specially formed guide ribs at the outer wall of the self-opener sleeve ( 3 ), which brings about that the self-opener sleeve ( 3 ), when continuously rotated in the inside of the spout ( 2 ), and by being guided at these guide ribs, describes an uneven downwardly directed movement, which superposes its rotational movement. Thus, the self-opener sleeve ( 3 ) first pierces the paper or cardboard laminate with the tip ( 24 ) of its lancing mandrel in a steep, screwline downwardly directed movement, and thereafter completes a horizontal rotational movement about 340°, whilst it cuts a circular disk out of the laminate with its sharp cutting edge, and thereafter pivots this downwards and retains it in this position.
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