220results about How to "Excellent ejection stability" patented technology

An ink for ink jet recording and an ink jet recording method which realize an image quality of laser printer on a plain paper in a one-pass printing mode under conditions of a volume of an ink droplet ejected being 5 to 43 Pico liter, a velocity of an ink droplet being 6 to 20 m / sec, frequency of 1 kHz and resolution of 300 dpi or more. The ink for ink jet recording is a penetrating type ink which includes (1) at least one humectant selected from glycerin, 1,3-butandiol, triethyleneglycol, 1,6-hexanediol, propyleneglycol, 1,5-pentanediol, diethyleneglycol, dipropyleneglycol, trimethylolpropane and trimethylolethane, (2) colorant contained in the amount of 6% by weight or more, (3) a polyol having 8 to 11 carbon atoms and glycolether, and an anionic surfactants or non-ionic surfactants, the ink has viscosity of 5 mPa.s or more at 25° C. and a surface tension of 40 mN / m or less.

An object of the present invention is to provide an ink composition for ink jet recording, which can produce high-quality prints and has excellent ejection stability, and to provide an ink set using the same. The ink composition for ink jet recording according to the present invention is characterized by comprising at least a compound represented by formula (I) whereinEO represents an ethyleneoxy group;PO represents a propyleneoxy group;m1, m2, m3, n1, n2, and n3 each are independently 0 (zero) or a natural number of not less than 1;EO and PO may be arranged, regardless of order in the parentheses [ ], randomly or as blocks joined together; and m1+m2+m3+n1+n2+n3 is in the range of 0.5 to 10 in terms of number average of a mixture of compounds represented by formula (I), and a colorant, provided that when, in formula (I), all of n1, n2, and n3 are zero, the ink composition further comprises glycerin.

Disclosed herein is an ink-jet recording method comprising a step of applying thermal energy to an ink to generate bubbles thereby ejecting the ink from an ejecting portion to record, wherein the relationship among a cloud point (T) of a liquid obtained by removing coloring material from the ink, a temperature T0 of the ink before formation of the bubbles in a portion in which the bubbles are generated and a temperature T1 of a part of the ink, which includes a portion in contact with the bubbles and surrounds the bubbles, satisfies T0<T<T1.

An ink composition comprising at least one of water-soluble dyes represented by the following formulae (1) to (3) and a surfactant:

Inkjet apparatus includes: a tank; a first flow channel; a first liquid chamber; a second flow channel; a second liquid chamber; a first liquid movement; a second liquid movement device; a first pressure determination device; a second pressure determination device; a pressure control device which controls pressures in the first and second liquid chambers by respectively controlling the first and second liquid movement devices, in accordance with determination results of the first and second pressure determination devices, in such a manner that the internal pressures of the first and second liquid chambers respectively remain at the target pressures; a circulation path through which the liquid inside the first liquid chamber is circulated without passing through the inkjet head; and a deaeration device which is provided at an intermediate point of the circulation path and which removes dissolved gas.

The liquid supply apparatus supplies liquid for ejection to a liquid ejection head. The apparatus comprises: a tank which stores the liquid; a liquid supply channel through which the liquid in the tank is conveyed to the liquid ejection head; a flow rate determination device which determines a flow rate of the liquid flowing through the liquid supply channel; a pressure loss determination device which determines a pressure loss in a whole of the liquid supply channel according to the flow rate determined by the flow rate determination device; a pressure loss modification device which is disposed in a portion of the liquid supply channel and modifies the pressure loss in the liquid supply channel; and a control device which controls the pressure loss modification device according to the pressure loss in the whole of the liquid supply channel determined by the pressure loss determination device, in such a manner that the pressure loss in the whole of the liquid supply channel remains substantially constant.

The dripping of washing liquid and the infiltration of washing liquid from a nozzle surface of a head when the nozzle surface is wiped is suppressed and discharge stability is improved. A wiping unit (100) includes a conveying portion (110) for conveying a wiping web (112), a washing liquid supplying portion (140) for supplying washing liquid to the wiping web, and a washing liquid collecting portion (150) for collecting washing liquid from the wiping web to which washing liquid has been supplied. After washing liquid is supplied to the wiping web, which is conveyed by the conveying portion, at washing liquid supplying portion, surplus washing liquid is collected from the wiping web at the washing liquid collecting portion. The wiping web from which washing liquid has been collected is wound on a pressure roller (122) and comes into press contact with the nozzle surface of the head, thereby wiping web wipes and cleans the nozzle surface.

An ink jet recording method includes ejecting an ultraviolet-ray curable ink of which a viscosity at 28° C. is 8 mPa·s or more from a head to a recording medium, and curing the ultraviolet-ray curable ink attached to the recording medium, wherein, in the ejecting of the ultraviolet-ray curable ink, the ultraviolet-ray curable ink is heated such that a temperature of the ejected ultraviolet-ray curable ink becomes 28° C. to 40° C., and a viscosity of the ultraviolet-ray curable ink at the temperature is 15 mPa·s or less.

The invention provides an aqueous ink that can prevent clogging at an orifice due to drying of the ink though the ink contains a pigment, and can achieve high-level ejection stability required in recent years. The aqueous ink contains at least water, a water-soluble organic solvent and carbon black particles, the carbon black particles including carbon black particles having a particle size of 0.5 μm or more, wherein a proportion made up by the volume of carbon black particles having a particle size of 0.2 μm or more and less than 0.5 μm is 0.3% or less based on the total volume of all the carbon black particles in the ink, a number of carbon black particles having a particle size of 0.5 μm or more and less than 5.0 μm is 1.0×107 or less per mL of the aqueous ink, and an average particle size value of the carbon black particles is from 0.060 μm or more to 0.130 μm or less.

An ink for ink-jet recording containing: a colorant; and a solvent mixture containing water and solvent A which is not water, wherein solvent A has a surface tension of 25 to 40 mN / m at 25° C.; a viscosity of 1 to 50 mPs·s at 25° C.; and a vapor pressure of not more than 133 Pa at 25° C., a content of solvent A is from not less than 50 to less than 90 weight % based on the total weight of the ink; and a content of water is from not less than 10 to less than 45 weight % based on the total weight of the ink.