A container closure comprises an annular region forming a counterface against which a gas permeable, liquid impermeable sealing element may be applied so as to urge the sealing element into sealing engagement with the rim of a container opening. The annular region comprises a gas pathway from an int
A container closure comprises an annular region forming a counterface against which a gas permeable, liquid impermeable sealing element may be applied so as to urge the sealing element into sealing engagement with the rim of a container opening. The annular region comprises a gas pathway from an interior space opposite the container opening to the exterior of the annular region. The gas pathway may be of closed cross-section extending through the annular region. Alternatively the gas pathway may be of open-sided cross-section and provided in the counterface. Yet alternatively the annular region may comprise a washer, with the gas pathway provided at least partly in the washer and/or at least partly in the remainder of the annular region. A gas permeable, liquid impermeable sealing foil for bonding to a container rim is also disclosed.
대표청구항▼
1. A container closure, comprising: a top wall having an exterior surface and an interior surface, the top wall being provided, at the interior surface, with an annular part forming a counterface;a side wall axially extending from the top wall interior surface;a sealing element having a top surface,
1. A container closure, comprising: a top wall having an exterior surface and an interior surface, the top wall being provided, at the interior surface, with an annular part forming a counterface;a side wall axially extending from the top wall interior surface;a sealing element having a top surface, a bottom surface and a peripheral edge, the sealing element having a portion that is gas permeable and liquid impermeable; andan interior space defined between the top wall interior surface and the sealing element top surface and surrounded by the counterface,wherein the sealing element is configured to overlap with the counterface, the sealing element sealing a rim of a container opening and being urged into engagement with said rim by said counterface when the container closure is secured to the container opening, andwherein a gas pathway is in gas communication between the interior space and an annular space defined between said side wall and said peripheral edge of the sealing element, wherein the interior surface of the top wall defines a plurality of inclined surfaces extending radially across the counterface, and wherein the gas pathway is at least partially defined by the inclined surfaces. 2. The container closure of claim 1, further comprising a separately formed washer on which the counterface is located. 3. The container closure of claim 2, wherein the annular part comprises the washer. 4. The container closure of claim 3, wherein a surface of the washer or an opposing surface in the remainder of the annular part defines a part of the gas pathway. 5. The container closure of claim 1, wherein the gas pathway is unbranched, branched, or reticulated. 6. The container closure of claim 1, wherein a transverse cross-sectional profile of the counterface is wave shaped. 7. The container closure of claim 1, wherein a transverse cross-sectional profile of the counterface is saw-toothed. 8. The container closure of claim 7, wherein a transverse cross-sectional profile of the counterface is asymmetrical. 9. The container closure of claim 7, wherein a transverse cross-sectional profile of the counterface comprises flattened teeth tip regions. 10. The container closure of claim 7, wherein a transverse cross-sectional profile of the counterface comprises flattened bases to hollows between teeth of the saw-toothed counterface. 11. The container closure of claim 1, wherein the interior space of the container closure comprises one or more spacing supports which support the sealing element to define a gap that is in gas communication with the gas pathway. 12. The container closure of claim 1, wherein the annular part is provided at or towards an outer edge of the top wall. 13. The container closure of claim 1, wherein the sealing element is secured inside the container closure to cover the annular part and interior space. 14. The container closure of claim 13, wherein the side wall comprises a peripheral groove into which the sealing element is clipped. 15. The container closure of claim 13, wherein the side wall comprises a series of undercut protuberances forming notches into which an outer edge of the sealing element is clipped. 16. The container closure of claim 1, wherein the sealing element comprises: a sealing foil of predetermined shape,wherein the sealing foil is gas permeable and liquid impermeable, andwherein the sealing foil is configured to bond about a periphery of a container rim of corresponding shape. 17. The container closure of claim 16, wherein the sealing foil is provided with a tab forming a finger grip. 18. The container closure of claim 16, wherein the sealing foil comprises an induction heatable foil for welding to the container opening rim. 19. The container closure of claim 16, wherein the sealing element further comprises an aperture over which a gas-permeable, liquid impermeable layer is secured. 20. The container closure of claim 16, wherein the sealing element comprises a further part which remains in the container closure when the sealing foil has been ruptured or removed. 21. The container closure of claim 20, wherein the further part is secured to the sealing foil by a breakable connection. 22. The container closure of claim 21, wherein the further part is connected to the container closure in use and the sealing foil is secured to the further part by the breakable connection prior to removal of the container closure. 23. The container closure of claim 22, wherein the strength of the connection between the further part and closure and the strength of the bond between the sealing foil and container opening rim are greater than the strength of the breakable connection between the sealing foil and the further part. 24. The container closure of claim 20, wherein the further part is gas-permeable and liquid impermeable and is arranged in the container closure to be in gas communication with the sealing foil prior to its removal. 25. The container closure of claim 24, wherein the further part is of similar shape to the sealing foil.
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