| 摘要 |
PROBLEM TO BE SOLVED: To enable an organic pigment, etc., deposited on the inside surface of a tank to be removed well by conducting low-speed brushing or low-pressure spraying alone in cleaning the inside surface of a tank after it is used for preparing e.g. a mixture liquid containing an organic pigment dispersion. SOLUTION: The main body 1 of the tank comprises a trunk 2 for storing a mixture liquid containing an organic pigment dispersion and an upper mirror part 3 having an almost ellipsoidal section and installed at the upper side of the trunk 2. Around the trunk 2, a jacket 4 for the trunk is installed. Around the upper mirror part 3, a jacket 5 for the mirror part is installed. In the jackets 4 and 5, warm water pipes (not shown in the figure) are arranged vertically and horizontally. Warm water supplied to the warm water pipes installed in the jacket 5 for the mirror part is kept at a temperature higher than that of warm water supplied to the warm water pipes installed in the jacket 4 for the trunk, keeping the mirror part 3 at a temperature higher than that of the trunk 2.
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