| 摘要 |
PROBLEM TO BE SOLVED: To stabilize and keep at a high level the quality of extracted liquid obtained by sterilizing a solid raw material such as tea leaves, coffee beans and a dried bonito and extracting it by hot water, or the like. SOLUTION: An extraction container 2 housing the solid raw material 1 is stored in a treatment tank 3 and the inside of the tank 3 is evacuated using a vacuum system 10 and then steam is supplied from a gas supply system 20 and enclosed inside the tank 3. The inside of the tank 3 is heated by the steam to the temperature suitable for sterilization or digestive modification of the solid raw material and then is displaced to become an inert gas atmosphere by switching the steam supplied from the system 20 to an inert gas such as a nitrogen gas. The extracted liquid is collected in a collecting means 2a of the container 2 by scattering the sterilized extractant such as hot water over the material 1 in the container 2 from a liquid supply system 30. The collected extracted liquid is withdrawn and received in an extracted liquid receiving container 40 outside the tank under the inert gas atmosphere.
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