초록 ▼

In combination, a container and a linerless cap and a method of forming the cap. In the method the cap is molded from plastic and includes a top well, an outer depending skirt and an internal depending substantially annular wall having an upper end integral with and depending from the top wall and a

In combination, a container and a linerless cap and a method of forming the cap. In the method the cap is molded from plastic and includes a top well, an outer depending skirt and an internal depending substantially annular wall having an upper end integral with and depending from the top wall and a lower free end. Thereafter the free end is engaged by a curling tool to progressively turn the free end away from the internal wall to curve the free end into a curvilinear compressible and resilient free end adapted to be engaged for sealing. The engageable free end of the seal can have a coil, O, U, J or quarter round cross sectional shape and can be a rim, plug or corner seal.

대표청구항 ▼

A method of forming a cap including a linerless seal for a container having a neck comprising: molding a cap from plastic having a top wall, and a depending wall within the cap comprising plastic and having an upper end extending from said top wall to a lower free end, and engaging said lower free e

A method of forming a cap including a linerless seal for a container having a neck comprising: molding a cap from plastic having a top wall, and a depending wall within the cap comprising plastic and having an upper end extending from said top wall to a lower free end, and engaging said lower free end with a substantially concave surface in the rim of the container neck as the cap is placed and closed on the container neck to progressively curl said free end as it moves along said substantially concave surface away from said inner depending wall and from said substantially concave surface while stretching and softening the curled portion of said free end in contact with said substantially concave surface of the neck of the container, to thereby form a stretched softened curled free end, and continuing to close the cap on the container neck whereupon the stretched softened curled free end of the curl is compressed and placed in sealing engagement with said substantially concave surface of the neck of the container.