| 摘要 |
The container (10) has a varied sized substance body chamber (12) with a channel (14) at an exit end. Within the channel (14) is a positive seal valve (14) that can reseal the container (10) after it has initially been opened. This valve (14) is comprised of an upper wall (30) of the channel being in a close contact with the lower wall (32). The lower wall (32) usually will have a concave shape, with the upper wall contacting the lower wall with a mating convex shape. When a compressive pressure is applied to the substance holding chamber (12), the substance flows down the channel to the valve (14). When the liquid pressure reaches a given level, the concave upper wall (30) of the valve moves out of contact with the convex lower wall (32) and some of the substance is dispensed. Upon the cessation of pressure the convex and concave portions come back into contact to cut off the flow of the substance.
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