| 摘要 |
A paper container filling a liquid content which comprises an upper air gap formed therein for sealing solely carbon dioxide or nitrogen gas and carbon dioxide. Thus, a recess is produced on the paper container by utilizing a small pressure reduction in the container generated as a result of carbon dioxide dissolved in the liquid content, and the recess is used as a criterion of deciding the presence of gas substitution, presence of pinhole of the container and the propriety of sealing of the container only by the recess. This container can be fully inspected by the naked eye. Further, a method of filling gas and apparatus for filling the gas in a paper container formed of a synthetic resin layer of aluminum foil or polyethylene mainly with paper by eliminating the abovementioned disadvantages and performing gas substitution merely by adding a simple unit on a filling machine, thereby holding taste, odor and nutrient components of the container contents for 4 or longer months.
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