To enable the high speed preparation of a homogeneous solution of high concentration containing reduced bubbles by mixing powder and liquid, both are deaerated under reduced pressure, under reduced pressure and dissolving the powder in the liquid to prepare a solution.
An intermediate chamber 3 and a vacuum powder hopper 4 are connected with a vacuum chamber 18 connected with a vacuum pump 20 through valves 17, 19, and a liquid chamber 7 and a solution chamber 8 are connected with the chamber 18. In the preparation of a homogeneous solution, powder such as coffee powder is sent from a Roots blower 1 for powder transportation to a hopper 2, the pressure is reduced, the powder is deaerated by the chamber 3 and the hopper 4 and supplied to the pump 5. Besides, liquid such as hot water is sent to the chamber 7, aerated, supplied to the pump 5, and mixed with the powder in the pump 5 to dissolve the powder. By a process in which powder and liquid are deaerated under reduced pressure and the powder is dissolved under reduced pressure, a solution containing reduced bubbles can be produced continuously at high speed.
SAOTOME KEN
NAKATSUBO TADASHI
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