| 摘要 |
<p>A venting device for use with a container closure cap of the type having a flexible pouring spout which is extendable to a pouring orientation from a nested orientation includes a hollow central body portion having a top end, a base and an interior passageway extending therethrough. Joined to the top end of the central body portion is a generally cylindrical portion and joined to the top of this generally cylindrical portion is a frustoconical portion. The base of the central body portion is integrally joined to a substantially flat flange portion which includes a spaced plurality of outwardly radiating ribs. The venting device is joined to the flexible pouring spout of the container closure cap by means of spacer strips which are heat welded between the venting device and the closure cap thereby positioning the venting device in a concentric relationship to the closure cap. These spacer strips provide a series of air flow passageways for the entry of venting air so that such air does not enter the pouring orifice which would result in pulsations to the exiting liquid flow. The outwardly radiating ribs are pulled into abutting engagement with the edge of the flexible pouring spout when the spout is extended to a pouring orientation and these ribs provide only a very slight clearance for the venting air to enter the container so that the clearance provided is sufficiently small to prevent the exit of viscous fluids through the clearance areas.</p> |
