A closure of the press-on type which includes a shell having therein a liner which functions to both form a seal with a container neck finish and also to form in the closure threads which are complementary to the threads of a container neck finish wherein although the closure is pressed on, it may be removed by rotating the same and further may be reapplied to have the same original tight seal. The closure is particularly identifiable by the properties and dimensions of the liner with the properties including a percent puff range and a hardness and the dimensions including certain critical dimensions as to liner thickness.
An insert (1) for a closure provides, in a single component, a gasket function between the end panel (12) of the closure and the end sealing surface (22) of a container neck finish (20), a thread forming feature (3) and a tamper evident band (5). The sealing portion (gasket (2) and thread forming feature (3)) of the insert is formed from soft pliant material so as to provide excellent sealing. The tamper evident band (5) is made from much stiffer material than that of the sealing portion, thereby providing rigidity to the entire component. During assembly the integral tamper evident band (5) thus maintains the insert in a circular and non-twisted shape, ensuring ease of handling of the insert.
This relates to a closure cap having an end panel which is equipped with a central button or panel area so as to cause deflection, either by way of a vacuum within an associated container or by mechanical action when a container is closed. Recently, there has been developed a desire for a louder popping noise when the closure is removed. Also there has been developed tamper indicating indicia elements to be actuated by the button or panel area to irreversibly indicate that a container has been opened even though the closure cap has been reapplied. A need for a greater stored energy in the button or panel area has been found and such additional stored energy is obtained by utilizing faceted areas or portions.
This relates to a composite closure which incorporates the conventional closure of the press-on, twist-off type including a metal shell having in the center of an end panel thereof a tamper indicating button. The composite closure includes an overcap which is frictionally interlocked with the shell and wherein the shell has been modified so that the curl at the lower edge of the skirt thereof is outturned as opposed to being inturned and the rougher coating for receiving the sealing compound increases the frictional connection between the overcap and the metal shell. In addition, the overcap is provided with a tamper indicating band which is interlocked with the container finish so as to prevent both axial upward movement and circumferential movement of the tamper indicating band relative to the container finish. This permits, with controlled tolerances, an interlocking relation between the composite closure and the container wherein when the composite closure is twisted to removed the same the tamper indicating band will be first released and thereafter the seal between the closure and the container is broken and the tamper indicating button will pop-up in a normal manner.
A plastisol-lined metal closure of the press-on, twist-off type and having improved top load resistance to permit containers capped with such closures to be packaged in open top trays, the plastisol lining having a density of at least approximately 58 pounds per cubic foot, and in a closure for a 51 millimeter container, a thickness in the container rim engaging portion thereof, before application to the container, of at least approximately 0.024 inch, a thickness in the portion thereof which engages the portion of the container finish below the threaded portion of the finish, before application to the container, of at least approximately 0.025 inch, and a thickness in the portion thereof which engages the portion of the container finish above the threaded portion, before application to the container, of no greater than approximately 0.026 inch.
A press-on, twist-off container assembly of the type that is used, for example, and baby food containers includes a container that has, as conventional, a finish portion with at least one external threadand a closure that is mounted on the container. The closure is of the press-on, twist-off type and includes a panel portion and a skirt portion that together define a generally cylindrical interior recess. As is conventional, a deformable gasket is mounted within the interior recess that has a thread engaging portion that is deformed so as to at least partially conform to the external threads of said finish portion of said container. The thread engaging portion advantageously has a plurality of inwardly extending raised flutes that are circumferentially spaced irregularly about the thread engaging portion. At least some of the flutes are in contact with at least one of the external threads at respective points of contact, and each external thread has a total distance spanned by such points of contact. As a result of the irregular spacing of the flutes, the container assembly will have an aggregate distance spanned that is a sum of the total distance spanned for all of the external threads that is less than it would be were the flutes spaced regularly. Accordingly, the amount of torque that is necessary to remove the closure is comparatively reduced.
