Abstract:
An ink jet recording head, includes a nozzle array of nozzle flow paths; ink ejection orifices communicating with the nozzle flow paths; heaters in the nozzle flow paths; and ink with which the head is filled. The ink contains a coloring material, an acetylene glycol-based surfactant, and water, the surfactant containing one or more kinds of an acetylene glycol or an ethylene oxide adduct thereof, an average addition number of moles of ethylene oxide of the whole surfactant being 3 to 7. The ink has a viscosity of 1.5 mPa·s to 3.0 mPa·s. The head is a line type head having an opening area of each ink ejection orifice of 100 μm2 to 350 μm2, a total number of nozzles of 1,200 or more, and a length of the nozzle array of 2 inches or more, and the head is driven at a frequency of 1 kHz to 10 kHz.
Abstract:
An ink jet recording ink including a pigment; water; and water-soluble compounds. The pigment comprises a resin-dispersed pigment dispersed with a (meth)acrylate-based random copolymer having an acid value of 100-160 mgKOH/g. The water-soluble compounds include at least ethylene urea and a water-soluble compound having a hydrophilicity-hydrophobicity coefficient defined by the following equation (A) of 0.37 or less The total content of the water-soluble compounds is 22-50 mass % with respect to the total amount of the ink The content of the ethylene urea is 11.0 mass % or more with respect to the total amount of the ink, and the proportion of the amount of the ethylene urea in the total amount of the water-soluble compounds is 50% by mass or less, Hydrophilicity-hydrophobicity coefficient=((water activity value of 20% aqueous solution)−(molar fraction of water in 20% aqueous solution))/(1−(molar fraction of water in 20% aqueous solution)) Equation (A).
Abstract:
An ink jet recording ink including a pigment; water; and water-soluble compounds. The pigment comprises a resin-dispersed pigment dispersed with a (meth)acrylate-based random copolymer having an acid value of 100-160 mgKOH/g. The water-soluble compounds include at least ethylene urea and a water-soluble compound having a hydrophilicity-hydrophobicity coefficient defined by the following equation (A) of 0.37 or less The total content of the water-soluble compounds is 22-50 mass % with respect to the total amount of the ink The content of the ethylene urea is 11.0 mass % or more with respect to the total amount of the ink, and the proportion of the amount of the ethylene urea in the total amount of the water-soluble compounds is 50% by mass or less, Hydrophilicity-hydrophobicity coefficient=((water activity value of 20% aqueous solution)−(molar fraction of water in 20% aqueous solution))/(1−(molar fraction of water in 20% aqueous solution)) Equation (A).
Abstract:
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 μm2, 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.
Abstract:
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 μm2, 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.
Abstract:
An ink jet recording ink including a coloring material; water; and three kinds of water-soluble compounds. The content of the water is 70 mass % or more with respect to the total amount of the ink. Each water-soluble compound has a molecular weight of 80 or more and is a liquid compound having a vapor pressure at 20° C. of 5 Pa or less or a solid compound, and at least one kind of the water-soluble compounds is a solid compound. In case that the water-soluble compounds are mixed at a ratio at which the water-soluble compounds are incorporated into the ink to provide a mixture, a 40% aqueous solution of the mixture has a water activity value of 0.88-0.91 and a viscosity of 3.3 mPa·s or less. The total content of the water-soluble compounds in the ink is 20-25 mass % with respect to the total amount of the ink.
Abstract:
An ink jet recording head, including: a nozzle array of nozzle flow paths; ink ejection orifices communicating with the nozzle flow paths; heaters in the nozzle flow paths; and ink with which the head is filled, the ink containing a coloring material, an acetylene glycol-based surfactant, and water, the surfactant containing one or more kinds of an acetylene glycol or an ethylene oxide adduct thereof, an average addition number of moles of ethylene oxide of the whole surfactant being 3 to 7, the ink having a viscosity of 1.5 mPa·s to 3.0 mPa·s, the head comprising a line type head having an opening area of each ink ejection orifice of 100 μm2 to 350 μm2, a total number of nozzles of 1,200 or more, a length of the nozzle array of 2 inches or more, and the head being driven at a frequency of 1 kHz to 10 kHz.