초록 ▼

The invention concerns a plastic screwable closure cap which possesses a bung type internal seal (4) for sealing a closeable container. The internal seal comprises a narrow sealing portion with an insert portion (6) immediately beneath, said insert portion serving to centre and gently introduce the

The invention concerns a plastic screwable closure cap which possesses a bung type internal seal (4) for sealing a closeable container. The internal seal comprises a narrow sealing portion with an insert portion (6) immediately beneath, said insert portion serving to centre and gently introduce the internal seal. In order to attain the earliest possible venting of the closure cap when screwing off, venting recesses are provided on the insert zone (6). These prevent the insert portion from sealing the container, and enable the release of gas from the container as soon as the sealing portion comes out of engagement with the container mouth. The side surfaces of the vent recesses also serves as friction surfaces, in order to generally flatten irregularities on the container mouth before the actual sealing portion is engaged.

대표청구항 ▼

[ We claim:] [1.] A screwably plastic closure cap for sealing a container at its orifice, said closure cap comprising:a cylindrical cap wall;a cap base having an inner surface and being adjacent to said cylindrical cap wall;an internal seal extending downwardly from the inner surface of said cap bas

[ We claim:] [1.] A screwably plastic closure cap for sealing a container at its orifice, said closure cap comprising:a cylindrical cap wall;a cap base having an inner surface and being adjacent to said cylindrical cap wall;an internal seal extending downwardly from the inner surface of said cap base, said internal seal possessing a radially outer surface comprising a surrounding sealing portion on its outer edge for internal sealing of the container orifice to be closed and possessing an insert portion beneath the sealing portion;said sealing portion being spaced from the cap base and defining a maximum outer diameter of the internal seal prior to placement on the container;said insert portion comprising a compression zone, whereby the compression zone is designed to engage the container orifice and be compressed when the insert portion is inserted into the orifice;wherein the radially outer surface of the internal seal possesses, in the area of said insert portion, at least one vent recess, said vent recess extending at least over the entire height of the compression zone, said compression zone and said at least one vent recess being axially below said sealing portion.