A method of pasteurising and vacuum packing food (2), comprising the steps of placing the food (2) on a tray 81) having a flexible bottom (7) and stiff lateral walls (8) extending in the vertical direction of the tray (1), up to a filling degree of 410-60% of the maximum volume of the tray (1), cove
A method of pasteurising and vacuum packing food (2), comprising the steps of placing the food (2) on a tray 81) having a flexible bottom (7) and stiff lateral walls (8) extending in the vertical direction of the tray (1), up to a filling degree of 410-60% of the maximum volume of the tray (1), covering the tray (1) with a flexible cover layer (3) to form a package, providing a one-way valve (4) for one-directional communication from the interior of the package (5) to the exterior thereof, pasteurising the contents inside the package (5) thus formed by means of microwaves, closing the valve (4) upon completed pasteurisation of the package and cooling the package (5), whereby a vacuum is created in the package (5) in such a manner that the package (5) with the vacuum-packaged food (2) therein presents a centre portion where the distance between said flexible cover layer (3) and said bottom (7) is shorter than the distance between said flexible cover layer (3) and said bottom (7) at the peripheral edges of the package.
대표청구항▼
The invention claimed is: 1. A method of pasteurising and vacuum packing food, comprising: placing the food on a tray up to a filling degree of 40-60% of the maximum volume of the tray, the tray having a flexible bottom and stiff lateral walls extending in the vertical direction of the tray; coveri
The invention claimed is: 1. A method of pasteurising and vacuum packing food, comprising: placing the food on a tray up to a filling degree of 40-60% of the maximum volume of the tray, the tray having a flexible bottom and stiff lateral walls extending in the vertical direction of the tray; covering the tray with a flexible cover layer to form a package, the flexible bottom along the periphery adjacent the lateral walls being angled causing the flexible bottom to be convex relative to the lateral walls when the package is not under vacuum; providing a one-way valve for one-directional communication from the interior of the package to the exterior thereof; pasteurising the contents inside the package thus formed by way of microwaves; and closing the valve upon completed pasteurisation of the package and cooling the package, a vacuum being created in the package in such a manner that the package with the vacuum-packaged food therein presents a centre portion where the distance between said flexible cover layer and said bottom is shorter than the distance between said flexible cover layer and said bottom at the peripheral edges of the package, the vacuum causing the flexible bottom to be concave relative to the lateral walls. 2. A method as claimed in claim 1, wherein the one-way valve is arranged on said flexible cover layer. 3. A method as claimed in claim 2, wherein said food includes all ingredients necessary for a ready-to-eat dish. 4. A method as claimed in claim 2, wherein said one-way valve is applied on said flexible cover layer during the step of covering said tray with the flexible cover. 5. A method as claimed in claim 4, wherein said food includes all ingredients necessary for a ready-to-eat dish. 6. A method as claimed in claim 1, wherein said food includes all ingredients necessary for a ready-to-eat dish. 7. A package for use in a method of pasteurisation and vacuum-packing food, said method comprising: placing the food on a tray up to a filling degree of 40-60% of the maximum volume of the tray, covering the tray with a flexible cover layer, providing one-way valve for one-directional communication from the interior of the package to the exterior thereof, pasteurising the contents inside the package thus formed by way of microwaves, and closing the valve upon completed pasteurisation of the package and cooling the package, a vacuum being created in the package, and the tray including a flexible bottom and rigid lateral walls extending in the vertical direction of the tray, the flexible bottom being concave relative to the lateral walls when the package is under vacuum, the flexible bottom the periphery adjacent the lateral walls being angled causing the flexible bottom to be convex relative to the lateral walls when the package is not under vacuum, said package with vacuum-packaged food contained therein presenting a centre portion, where the distance between said flexible cover layer and said bottom is shorter than the distance between said flexible cover layer and said bottom at the peripheral edges of the package. 8. A package as claimed in claim 7, wherein the bottom of said tray has a convex shape as seen from below, when the pressure inside the package exceeds or equals the pressure exteriorly thereof. 9. A package as claimed in claim 8, wherein the bottom of the tray is formed with a section that is spaced from the periphery of the bottom, which is essentially flat. 10. A package as claimed in claim 7, wherein the bottom of the tray is formed with a section that is spaced from the periphery of the bottom, which is essentially flat. 11. A package as claimed in claim 10, wherein the tray part located at the periphery of the bottom extends at an angle to the direction of extension of the tray. 12. A package as claimed in claim 10, wherein said section forms more than 40% of the total area of the bottom. 13. A package as claimed in claim 12, wherein the valve is arranged on said flexible cover layer. 14. A package as claimed in claim 7, wherein the valve is arranged on said flexible cover layer. 15. A package as claimed in claim 14, wherein said valve includes a slit formed in said flexible cover layer and of a reclosable adhesive film extending across the slit. 16. A package as claimed in claim 7, wherein the valve is arranged to emit a sound signal when vapour is flowing through said valve. 17. A package as claimed in claim 13, wherein said valve includes a slit formed in said flexible cover layer and of a reclosable adhesive film extending across the slit. 18. A package as claimed in claim 17, wherein the valve is arranged to emit a sound signal when vapour is flowing through said valve.
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