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A one-way valve, intended particularly for use in food packages The valve, which is intended to be fitted on a package, is arranged to open in response to an excess pressure inside and is recloseable. An adhesive sheet is arranged on top of an aperture formed in the packaging material. The adhesive

A one-way valve, intended particularly for use in food packages The valve, which is intended to be fitted on a package, is arranged to open in response to an excess pressure inside and is recloseable. An adhesive sheet is arranged on top of an aperture formed in the packaging material. The adhesive sheet being arranged to uncover the aperture when exposed to pressure loads.

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The invention claimed is: 1. A one-way valve intended particularly for food packages, said valve designed to be fitted on a package and arranged to open in response to an excess pressure inside said package, said one-way valve being recloseable, and having an aperture formed in the package material

The invention claimed is: 1. A one-way valve intended particularly for food packages, said valve designed to be fitted on a package and arranged to open in response to an excess pressure inside said package, said one-way valve being recloseable, and having an aperture formed in the package material, on top of which aperture an adhesive sheet is arranged, said adhesive sheet arranged to uncover the aperture when exposed to pressure loads, and wherein the valve is made recloseable using the adhesive sheet which may be opened and closed repeatedly, the adhesive sheet itself being arranged to emit a sound signal when the valve is open and an excess pressure exists inside the package. 2. The one-way valve as claimed in claim 1, wherein adhesive of the adhesive sheet is arranged to soften when exposed to heat. 3. The one-way valve as claimed in claim 1, wherein the package material in which said aperture is formed is a non-directional laminate. 4. The one-way valve as claimed in claim 1, wherein said aperture is configured as a slit. 5. The one-way valve as claimed in claim 4, wherein the slit is designed to constitute the edges of a tongue formed in the package material. 6. The one-way valve as claimed in claim 4, wherein said slit is V-shaped. 7. The one-way valve as claimed in claim 4, wherein said slit is arcuate. 8. The one-way valve as claimed in claim 1, wherein said adhesive sheet comprises a flap, which essentially covers a tongue formed in the package material. 9. The one-way valve as claimed in claim 8, wherein the direction in which said flap opens essentially is the same as the direction in which said tongue opens. 10. The one-way valve as claimed in claim 4, wherein the slit is linear. 11. The one-way valve as claimed in claim 10, wherein the direction of extension of said slit is parallel with one of the long sides of the adhesive sheet and wherein said slit is located beneath said side of the adhesive sheet. 12. The one-way valve as claimed in claim 1, wherein at least part of the adhesive sheet is provided with an adhesive suitable for use with foods. 13. The one-way valve as claimed in claim 1, wherein said adhesive sheet is a tape. 14. The one-way valve as claimed in claim 13, wherein said tape is resilient. 15. The one-way valve as claimed in claim 1, wherein said adhesive sheet is a label.