| 摘要 |
<p>A venting closure (1) with a hinged cover (5) has a degassing device provided by a chimney (8) which extends inwardly from the end (3) of the body (2) of the cap. At its inner end the chimney is closed by an inclined semi-permeable membrane (9), whereas the outer end of the chimney, in the plane of the cap end (3), is permanently closed by a hinged lid (10) formed with vent holes (11). The lid (10) is moulded in one-piece with the cap. It is moulded open, and is closed in the mould at the same time as the cover is closed. For that purpose the cover has an inwardly extending rib (13) which engages it as the cover closes. The mould also has provision for cutting the membrane (9) from a parent strip, and for positioning it in the mould cavity prior to the injection of synthetic material.</p> |
