초록 ▼

A linerless closure which provides an effective seal against oxygen penetration and moisture evaporation includes a cap with an inner annular member defining an annular outwardly directed sealing edge which forms a line seal with the inner cylindrical surface of a container wall and an outer annular

A linerless closure which provides an effective seal against oxygen penetration and moisture evaporation includes a cap with an inner annular member defining an annular outwardly directed sealing edge which forms a line seal with the inner cylindrical surface of a container wall and an outer annular member defining an annular inwardly directed sealing edge which seals against the outer cylindrical surface of a container wall.

대표청구항 ▼

A linerless closure for a container having a cylindrical container wall of a given radial thickness with inner and outer cylindrical surfaces and terminating in a rim which defines a container opening, and having cap engaging means on said outer cylindrical surface spaced from said rim, said linerle

A linerless closure for a container having a cylindrical container wall of a given radial thickness with inner and outer cylindrical surfaces and terminating in a rim which defines a container opening, and having cap engaging means on said outer cylindrical surface spaced from said rim, said linerless closure comprising: a cap adapted to be removably secured to said container by said cap engaging means to close said container opening; a first annular member on said cap having a frusto-conical outer surface extending downwardly and outwardly, and a downwardly and inwardly directed frusto-conical end face which intersects said outer surface to form an annular radially outwardly directed sealing edge; and a second annular member on said cap having a downwardly and inwardly directed frusto-conical upper surface and a downwardly and outwardly directed frusto-conical end face which intersects said upper face to form an annular radially inwardly directed sealing edge; said annular radially outwardly directed sealing edge and said annular radially inwardly directed sealing edge being substantially horizontally aligned in confronting relation and spaced radially a distance adapted to be less than the given radial thickness of said container wall with said annular radially outwardly directed sealing edge adapted to engage and make a line contact seal with the inner cylindrical surface of said container wall below said rim when said cap is secured to said container, and said annular radially inwardly directed sealing edge on said second annular member adapted to engage and make a line contact seal with the outer cylindrical surface of said container wall below said rim when said cap is secured to said container, said end face on said first annular member forming a first lead angle adapted to engage said container wall, said end face on the second annular member forming a second lead angle adapted to engage said container wall, and one of said lead angles being smaller than the other.