| 摘要 |
Container closure members of plastics possess certain advantages over metal-type closures, but frequently there are form stability problems. This invention provides measures of a prophylactic nature for prohibiting form instability of plastics closures while maintaining desired characteristics of the closures as, for example, acceptable tightness, stacking facility, resistance against internal overpressure and, if necessary, easy openable characteristics. Broadly, the form stability problem has been solved by giving the plastics closure an edge flange formable in situ to the final configuration thereof.
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