| 摘要 |
<p>A plastic cap (1) comprises an oxygen-tight liner (8) to be joined to an opening end surface (6) of a spout (5) on a container (4). The cap (1) has a circumferential skirt (2) with an internal annular bead (3) adapted for snap connection with a corresponding annular groove (7) in the spout (5). The liner (8) has on the side facing the cap (1) a first plastic layer (81), which is arranged to be permanently joined, when injection-moulding the cap (1), to the plastic material of the cap (1), and on the side facing the container (4) a second plastic layer (82), which is arranged to be temporarily hermetically sealed to said opening end surface (6). On the end facing the container (4), the skirt (2) has a radial projection (10) which serves as a thumb grip and which when opening the container (4) allows the cap (1) to be bent away from said opening end surface (6) so that the temporary, hermetic seal between the second plastic layer (82) of the liner (8) and the opening end surface (6) of the spout (5) is gradually broken. A method of making the cap (1) comprises primarily the steps of applying the liner (8), prior to the injection-moulding of the cap (1), to a mould wall in a cavity of a mould and, while retaining the liner in position, injecting plastic into the mould through said mould wall.</p> |
