A METHOD OF PACKING A FOOD AND OF HEAT TREATING IT FOR PURPOSES OF EXTENDING ITS SHELF-LIFE

摘要

A method of packing a food, and heat treating the food for purposes of extending its shelf-life, in a packaging container consisting of a packaging laminate comprising a core layer of paper or paperboard and outer plastic coatings of polyethylene, preferably low density polyethylene. The filled and sealed packaging container is conveyed through a treatment chamber or tunnel comprising a heating zone in which the packaging container is heated to the desired treatment temperature, e.g. 80- 100 C, a holding zone in which the packaging container is kept at the desired treatment temperature and a cooling zone, wherein the packaging container during both of these treatment phases is subjected to an outer support pressure of less than 0.5 bar, preferably 0.2-0.3 bar.