Patent ID: 7771768
Filing Date: 2010-08-10
Classification: A23L,B65B,B65D

Abstract:
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.