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    • 6. 发明授权
    • Automatic closure for containers
    • 集装箱自动关闭
    • US3610477A
    • 1971-10-05
    • US3610477D
    • 1969-07-16
    • HERZIG ALBERT M
    • HERZIG ALBERT M
    • B65D1/32B65D47/20
    • B65D47/2031B65D1/32
    • This invention is an improved automatic closure for squeeze bottles or the like tubes or containers of the type formed from semirigid, flexible material such as polyethylene or semirigid polyvinyl chloride having properties of resilient flexibility, and means and methods for making the same. The container is provided with a preferably tapered neck portion terminating in lips and edges forming an openable closure elongate in cross section. One or both of these lips is preferably formed with an inherent reentrant or inward curve or set so that when the tapered side edges are sealed together and the lips are pressed together they provide the closure, which is opened by pressure digitally exerted on the container and closes on release of pressure. A closure which can effectively seal is realized in this manner by way of a preferred sealing technique. In this technique, sealing dies are used having nonsealing inserts so that when sealing, the outlet of the container is subjected to a uniform clamping pressure so that the outlet thereof is held fully flattened and uniformly closed during the sealing operation, both in and adjacent the closure to obviate the formation of irregularities and leaks at and adjacent the sealed edges. Upon release of clamping pressure the preferred form of outlet retains an inherent closing bias. A tear-strip seals the outer end of the end of the closure until removed in a manner heretofore disclosed.