Process for producing vegetable or fruit pulp or puree packaging

The present invention refers to a process for producing vegetable or fruit pulp or puree packaging, comprising the steps of: a) providing pieces of fruit or vegetables; b) treating said pieces of fruit or vegetables so as to obtain a homogeneous semi-processed product in the form of a puree; c) keeping said puree under agitation conditions at a temperature ranging from room temperature to 60 DEG C for a time length ranging from 5 minutes to 40 minutes, at a pH value ranging from 2.6 to 2.9; d) filling said puree into a flexible bag formed of a sheet material comprising three layers of food-grade plastic film and one layer of aluminium foil sandwiched between said layers of plastic film; e) creating a vacuum inside said flexible bag so as to reach down to a vacuum value of not less than 0.2 bar; f) sealing said bag immediately after the vacuum creating step according to e) above; g) submitting said bag to heat treatment through a sequence of successive sub-steps comprising a first sub-step having a time length