| 摘要 |
PURPOSE:To make it possible to mass produce a kind of ink which is suitable for ink jet recording and writing pens by such an arrangement wherein plural processing units for refining dye solution by the execution of chromatography are provided and the preparation of a kind of ink is performed by using such refined dye solution. CONSTITUTION:A refining unit 41 which excludes inorganic salts from dye aqueous solution is composed of plural number of hypochlorization processing unit 42. A supply valve open/close unit 43 controls whether supplied dye aqueous solution, pure water and the secondary solution are to be supplied to a hypochlorization filter unit 44 or not. The hypochlorization filter unit 44 excludes inorganic salts from dye aqueous solution and the secondary solution supplied from the supply valve open/close unit 43 by chromatography. By the control of a discharge valve open/close unit 45, the dye aqueous solution of which inorganic salt density has been lowered less than a specified value by refining is discharged into a storing tank 56 through a discharge pipe 55. The aqueous solution discharged from the filter unit 44 is discharged into an inorganic salt solution discharging unit 58 or into a discharge pipe 59 through a discharge pipe 57 according to the density of its ingredient. |
