IMPROVED CONTAINER CLOSURES

摘要

Disclosed herein is a container closure sealing washer pre-assembly (40) comprising at least one part (42) of one material integrally formed with another part (44) of another material, preferably both materials are resiliently deformable, elastomers, with said one material being capable of greater compression than said another material and being a nitrile rubber and said another material being more inert to or compatible with given container contents than said one material and being an ethylene-propylene-diene-monomer rubber; the sealing washer may be used in combination with an insert (10) having a body (12) with a radially extending flange (14), the sealing washer being stretched about and thereby retained on the flanged insert and assuming a cylindrical to frusto-conic shape with at least said one part tightly in contact with the insert body and the said another part proximate to or contacting the insert flange; and the combination may be included in a closure for a container (22) with the flanged insert located in a collar (18) extending outwardly from the container, said one part of the sealing washer being radially compressed between the insert body and the collar and said another washer part being wedged between the corner formed by the insert body and the insert flange and the corner formed by the container wall and the collar.