Canon Finetech Inc.

Eriko Himura

Takahiro Tsutsui

Shoji Koike

Yusuke Sumikawa

Shintaro Suzuki

Yuusuke Sumikawa

A filling liquid for distribution of an ink jet head of a thermal type, the filling liquid filling a nozzle flow path during distribution of the ink jet head, a hydrophilic region formed on a periphery of an ink discharge port having an opening area of from 100 to 350 &#x3bc;m, the filling liquid including: an aqueous medium having at least a water-soluble organic compound and water as constituents; and a dye dissolved in the aqueous medium, a concentration of the dye in the filling liquid being 0.2 mass % or more and 1 mass % or less with respect to a total mass of the filling liquid and the concentration of the dye being equal to or less than saturation solubility with respect to the water-soluble organic compound, wherein the filling liquid has a surface tension of 25 mN/m or more and 34 mN/m or less.

Filling liquid for distribution of ink jet head, ink jet head, and distribution method for ink jet head

An ink-jet recording ink set includes: an ink (I) containing a dye D1, a compound C1 represented by the following formula and having a U+V of S1, and water; and an ink (II) containing a dye D2, a compound C2 represented by the following formula and having a U+V of S2, and water in which in case that a surface tension &#x3b3;L1 (mN/m) of an evaluation liquid L1 obtained by adding, to a 5 mass % aqueous solution of the dye D1, a compound C3 in an amount corresponding to 1 mass % of the aqueous solution, and a surface tension &#x3b3;L2 (mN/m) of an evaluation liquid L2 obtained by adding, to a 5 mass % aqueous solution of the dye D2, the compound C3 in an amount corresponding to 1 mass % of the aqueous solution satisfy a relationship of &#x3b3;L1&#x2212;&#x3b3;L2&#x2267;10 (mN/m), the S1 and the S2 satisfy a relationship of 2&#x2266;S2&#x2212;S1&#x2266;7. 

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Saitama, Japan

Eriko Himura