| 摘要 |
PCT No. PCT/JP92/00645 Sec. 371 Date Jan. 20, 1994 Sec. 102(e) Date Jan. 20, 1994 PCT Filed May 20, 1992 PCT Pub. No. WO93/23290 PCT Pub. Date Nov. 25, 1993In 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.
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