| 摘要 |
<p>1464619 Venting valves in containers L GOGLIO 12 June 1974 [14 June 1973] 26101/74 Headings B8C B8D B8K and B8V [Also in Division F2] A filled and closed container has a one-way valve 7 which during sterilization and possibly evacuation permits egress of steam and air from the inside through passages 16 and 25 and which can be shut-off. The valve comprises a base 8, a cap 20, and a soft rubber disc 27 sandwiched between the cap and base such that in a raised position of the cap excess pressure in the container can lift the disc off the base to permit flow through the passages 16, 25. After sterilizing, the cap can be pushed further on to the base to clamp the disc firmly against the base. There are intermeshing ridges and depressions 12, 13, 22, 23 between the cap and base, and a central strut 24 and a conical rib 26 in the lid. The container may be a flexible envelope formed of two opposed laminated sheets. An intermediate layer of the sheets may be aluminium and the other layers synthetic plastics. The envelope in a holder may be passed to a filling station, to a heat-sealing station, and under an evacuation hood. After sterilization in an autoclave, the envelope is passed between a pair of rollers which squeeze the valve cap against the base. Alternatively the valve may be in a lid heat sealed to an aluminium tray.</p> |
