SU137394A1 - Method of pasteurization of canned food in glass jars, sealed with metal lids - Google Patents

Description

The invention relates to a pasteurization method for canning in glass containers by heating canned food in hot water at atmospheric pressure.

Methods of pasteurization of canned food in glass containers, carried out in an airtight vessel (autoclave) at a temperature of 85-100 ° C with a back pressure of 0.8 to 1.2 atm, are already known. It was established by experiments that during pasteurization of canned food in glass containers, for example, CKO-83-1, at 100 ° C and provided that it is sealed under vacuum within 400 mm Hg. the column and the filling temperature of the product are not lower than 50 °; a counter pressure of 0.4-0.5 kg / cm should be created in the autoclave. If the glass container is sealed at atmospheric pressure, the pressure generated in the autoclave for the canned liquid consistency should be 1.0 kg / cm. Therefore, in the known methods of non-autoclaving atmospheric sterilization, in order to prevent deformation and breakage of the lids, special cassettes are used for laying glass containers (cans) with mechanically locked clamps or with thermo-mechanical bellows clamps.

However, among the drawbacks in the known devices for preventing the covers from breaking off are their complexity and low reliability.

In the present invention, these disadvantages are eliminated by the fact that when the cans are immersed in hot water at atmospheric pressure, the lids are isolated from the hot water and are continuously cooled during the pasteurization process.

It is known that the pressure developed in a product can, when heated, is composed of the sum of partial pressures of water vapor and air, depending on the temperature of the mixture in the unfilled can space during closure and sterilization, as well as due to the pressure during thermal expansion of the product. The latter depends on the temperature of the product. During the hot filling of the product, this pressure value is no. 137394 2 -

It is 30-35% of the total pressure in the can. By lowering the temperature of the vapor-air mixture in the unfilled space, we can remove heat from the vapor layer through the metal lid and, partially, condense water vapor on the inner surface of the lid when it is continuously cooled, which also prevents the lid from heating during pasteurization; and air in a glass container and thereby maintain the required strength of the capping at a pasteurization temperature of 100 ° and atmospheric pressure.

Subject invention

The method of cannabis canning in glass jars, sealed with metal lids, carried out by heating canned food in hot water at atmospheric pressure, characterized in that, in order to prevent the lids from breaking, they are insulated from it in the process of pasteurization is continuously cooled, for example, by irrigation with cold water.