초록 ▼

In accordance with the present invention, there can be mass produced long-term preservable lunches in a short period of time, because a series of such operations as formation, cleaning, sterilizing, dishing-up, sealing and filling the lunch box with an inert gas are carried out consistently by virtu

In accordance with the present invention, there can be mass produced long-term preservable lunches in a short period of time, because a series of such operations as formation, cleaning, sterilizing, dishing-up, sealing and filling the lunch box with an inert gas are carried out consistently by virtue of the production unit of lunches of the present invention. Further, because the lunches are allowed to pass through successively the gas chambers filled with the inert gas, no insufficient filling of the lunches with the inert gas will occur. Further, the lunch boxes can individually be filled with the inert gas when each lunch box is provided with a sealing valve and filled with the inert gas by inserting an inert gas filling tube into said lunch box through the sealing valve. The film for sealing the lunch boxes is provided thereon with a self-sealing member, and said lunch boxes may individually be filled with the inert gas by inserting the gas filing needle into each lunch box through said self-sealing member.

대표청구항 ▼

A production unit for preparing long-term preservable lunches, said production unit comprising: conveying means for conveying lunch boxes in which foodstuffs are dished up; a plurality of gas chambers through which said conveying means extends wherein each of said plurality of gas chambers is filled

A production unit for preparing long-term preservable lunches, said production unit comprising: conveying means for conveying lunch boxes in which foodstuffs are dished up; a plurality of gas chambers through which said conveying means extends wherein each of said plurality of gas chambers is filled with an inert gas, wherein adjacent gas chambers are separated by a curtain of inert gas and wherein said gas chambers are disposed successively in a conveying direction of said conveying means; filling means for filling a series of said gas chambers with an inert gas so that an inert gas concentration in said gas chambers of the series increases in the conveying direction of the conveying means; and sealing means for gas tightly sealing an upper surface of each lunch box with a film, wherein said sealing means is located in a gas chamber having the highest inert gas concentration.