United States Patent
US Patent 5320236: Plastic container package with linerless sealing…
US 5320236 · granted 1994-06-14
Abstract
A plastic container closure package with a linerless sealing closure system comprising a plastic container having a threaded finish for receiving a closure having a base wall and an internal skirt with complementary threads on the skirt. The plastic container is made by a process wherein a tube of molten plastic is inflated and blown to form the container and thereafter the tube is trimmed to form the sealing surface of the finish of the container. The closure includes an annular flange that extends downwardly from the underside of the base wall of the closure and radially inwardly of the closure for engagement with the container. The annular flange includes a smooth continuous frustoconical surface that faces the finish of the container and engages the inner edge at the juncture of the top surface and inside surface of the finish of the container. An annular stop extends axially from the underside of the base wall of the closure to limit the flexing of the annular flange. The width of the flange is such that the free end thereof normally extends beyond the inner edge of the finish into sealing engagement intermediate the free edge and the end of the flange.
| Patent Number | 5320236 |
|---|---|
| Title | Plastic container package with linerless sealing closure system |
| Filed | 1993-02-17 |
| Granted | 1994-06-14 |
| Inventor(s) | Gregory; James L. |
| Assignee | Owens-Illinois Closure Inc. |
| CPC Classification | B65D 41/04 |
| Number of Claims | 16 |
Abstract
A plastic container closure package with a linerless sealing closure system comprising a plastic container having a threaded finish for receiving a closure having a base wall and an internal skirt with complementary threads on the skirt. The plastic container is made by a process wherein a tube of molten plastic is inflated and blown to form the container and thereafter the tube is trimmed to form the sealing surface of the finish of the container. The closure includes an annular flange that extends downwardly from the underside of the base wall of the closure and radially inwardly of the closure for engagement with the container. The annular flange includes a smooth continuous frustoconical surface that faces the finish of the container and engages the inner edge at the juncture of the top surface and inside surface of the finish of the container. An annular stop extends axially from the underside of the base wall of the closure to limit the flexing of the annular flange. The width of the flange is such that the free end thereof normally extends beyond the inner edge of the finish into sealing engagement intermediate the free edge and the end of the flange.
Claim 1
A plastic container and closure package for liquids with a linerless sealing closure system comprising a plastic container and a closure, said plastic container having a threaded finish for receiving a closure, said finish having an upper end axially above the threads, said finish having a substantially flat top surface, an outer surface and an inner surface, said outer surface and said inner surface intersecting said top surface to define an inner edgeand an outer edge, said plastic container having a finish that has at least one variation comprising at least one of a variation in height circumferentially; a variation in inclination of the top surface of said finish; a variation in out-of-round; a variationin ovality of said finish, and a variation in a molding seam produced adjacent a seam formed by closed molds used in making the container, said plastic closure having a base wall and a peripheral skirt with complementary threads on the skirt engaging said threaded finish, said base wall having an underside, said closure including a single integral annular flexible flange that extends downwardly from the underside of the base wall of the closure and radially inwardly of the closu
Claims
16 totalA plastic container and closure package for liquids with a linerless sealing closure system comprising a plastic container and a closure, said plastic container having a threaded finish for receiving a closure, said finish having an upper end axially above the threads, said finish having a substantially flat top surface, an outer surface and an inner surface, said outer surface and said inner surface intersecting said top surface to define an inner edgeand an outer edge, said plastic container having a finish that has at least one variation comprising at least one of a variation in height circumferentially; a variation in inclination of the top surface of said finish; a variation in out-of-round; a variationin ovality of said finish, and a variation in a molding seam produced adjacent a seam formed by closed molds used in making the container, said plastic closure having a base wall and a peripheral skirt with complementary threads on the skirt engaging said threaded finish, said base wall having an underside, said closure including a single integral annular flexible flange that extends downwardly from the underside of the base wall of the closure and radially inwardly of the closu