| 摘要 |
<p>The lid is of the type intended for plug-fitting in a container mouth and has a top (11) and a skirt (12) provided with a flange (13) to permit levering of the lid out of engagement with a container. The lid is a one-piece plastics moulding and the skirt is formed with a cylindrical part (31) adjacent the flange for forming a first seal with the lip (22). A resiliently flexible free end part of the skirt has a frusto-conical surface (36), which engages with the inner end (25) of the lip to define a second seal, spaced from the first seal. Recesses (17) are provided at the radially outer edge of the surface (36), to permit air to escape, as the skirt slides down the lip (22) during fitting of the lid in the container.</p> |
