CN115848045A - Ink jet recording method and ink jet recording apparatus - Google Patents
Ink jet recording method and ink jet recording apparatus Download PDFInfo
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- CN115848045A CN115848045A CN202211122908.0A CN202211122908A CN115848045A CN 115848045 A CN115848045 A CN 115848045A CN 202211122908 A CN202211122908 A CN 202211122908A CN 115848045 A CN115848045 A CN 115848045A
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Abstract
The invention relates to an ink jet recording method and ink jet recording apparatus with an ejecting head having a nozzle plate with nozzles for ejecting ink containing resin, organic solvent and water, a liquid chamber communicating with the nozzles, a pressure generating mechanism for generating pressure in the liquid chamber, the ink is ejected by applying a first driving pulse and a second driving pulse by the pressure generating mechanism, the viscosity of the ink at 25 ℃ is 9.0 MPa.s or more and 11.0 MPa.s or less, the viscosity at 36 ℃ is 6.5 MPa.s or more and 11.0 MPa.s or less, and (1) the first driving pulse includes a first waveform element for applying a voltage exceeding a reference voltage after applying a voltage less than the reference voltage, and a second waveform element for applying a voltage below the reference voltage after the first waveform element; (2) The second drive pulse includes a third waveform element for pulling and pushing out the meniscus on the nozzle surface without ejecting ink.
Description
Technical Field
The present invention relates to an inkjet recording method and an inkjet recording apparatus.
Background
In recent years, permeable recording media such as textiles and canvas fabrics have been used in industrial applications such as wallpapers, advertisements, and billboards, and various inks for such permeable recording media have been developed.
As such an ink, for example, a solvent-based ink using an organic solvent as a solvent, an ultraviolet-curable ink containing a polymerizable monomer as a main component, and the like are widely used.
However, the solvent-based ink has a problem that evaporation of the organic solvent may affect the environment. In addition, the ultraviolet curable ink has a problem that options of polymerizable monomers to be used are limited in terms of safety.
Therefore, inks containing aqueous inks that have a small environmental load and can be directly recorded on a permeable recording medium have been proposed (see, for example, patent document 1).
In an inkjet recording apparatus using the above aqueous ink, it is necessary to increase the frequency of ejecting droplets of ink from a head when high-resolution images are produced, but if the frequency of ejection is increased, the ink is heated by vibration, and the viscosity of the ink is reduced. When the viscosity of the ink is lowered, a meniscus formed inside the head becomes unstable, and there is a problem that the droplets of the ink are not ejected or the velocity of the droplets varies.
By using ink having a high viscosity, a decrease in viscosity due to an increase in temperature can be reduced, but when ink is ejected, a satellite droplet generated at the end of a main droplet is generated, and the satellite droplet lands at a position different from that of the main droplet, which causes a problem of a decrease in image quality.
[ patent literature ] A
[ patent document 1 ] Japanese patent application laid-open No. 2006-142588
Disclosure of Invention
The invention aims to provide an ink jet recording method with good ejection stability.
As a method for solving the above-mentioned problems, an inkjet recording method according to the present invention is an inkjet recording method using an inkjet recording apparatus having an ejection head including a nozzle plate having nozzles for ejecting ink containing a resin, an organic solvent, and water, a liquid chamber communicating with the nozzles, and a pressure generating mechanism for generating pressure in the liquid chamber,
ejecting ink by applying a first drive pulse and a second drive pulse through the pressure generating mechanism,
the ink has a viscosity of 9.0MPa · s to 11.0MPa · s at 25 ℃, and a viscosity of 6.5MPa · s to 11.0MPa · s at 36 ℃,
the ink jet recording method satisfies the following conditions (1) and (2),
(1) The first drive pulse includes a first waveform element to which a voltage exceeding a reference voltage is applied after a voltage smaller than the reference voltage is applied, and a second waveform element to which a voltage equal to or smaller than the reference voltage is applied after the first waveform element;
(2) The second drive pulse includes a third waveform element for pulling and pushing out the meniscus on the nozzle surface without ejecting the ink.
According to the present invention, an inkjet recording method having excellent ejection stability can be provided.
Drawings
FIG. 1 is a view showing an example of an image forming apparatus for carrying out the image forming method of the present invention.
Fig. 2 is an explanatory diagram illustrating an example of a main box of the image forming apparatus of fig. 1.
FIG. 3 is a diagram showing an example of driving waveforms for implementing the image forming method of the present invention.
FIG. 4 is a diagram showing an example of driving waveforms for implementing the image forming method of the present invention.
The symbols in the figures are as follows:
400 image forming apparatus
401 casing
401c covering
404 ink cartridge holding member
410. 410k, 410c, 410m, 410y main box
411 ink storing portion
413 ink discharge port
414 Container case
420 mechanism part
434 spray head
436 supply hose
L ink storage container
Detailed Description
(ink jet recording method)
The ink jet recording system of the present invention uses an ink jet recording apparatus having an ejection head including a nozzle plate having nozzles for ejecting ink containing a resin, an organic solvent, and water, a liquid chamber communicating with the nozzles, and a pressure generating mechanism for generating pressure in the liquid chamber,
ejecting ink by applying a first drive pulse and a second drive pulse through the pressure generating mechanism,
the ink has a viscosity of 9.0MPa · s to 11.0MPa · s at 25 ℃, and a viscosity of 6.5MPa · s to 11.0MPa · s at 36 ℃,
the ink jet recording method satisfies the following conditions (1) and (2),
(1) The first drive pulse includes a first waveform element to which a voltage exceeding a reference voltage is applied after a voltage smaller than the reference voltage is applied, and a second waveform element to which a voltage equal to or smaller than the reference voltage is applied after the first waveform element;
(2) The second drive pulse includes a third waveform element for pulling and pushing out the meniscus on the nozzle surface without ejecting the ink.
< spray head >
The head preferably includes a nozzle, a nozzle plate having the nozzle, a liquid chamber communicating with the nozzle, and a pressure chamber for generating pressure in the liquid chamber by pressure generating means, and further includes stimulus generating means and heating means.
The ink is ejected from the ejecting head to form a printing layer.
Nozzle plate
The nozzle plate has a nozzle substrate and an ink-repellent film on the nozzle substrate.
Pressure chamber-
The pressurizing chamber generates pressure in the liquid chamber by a pressure generating mechanism.
The pressurizing chamber is a plurality of individual flow paths which are arranged corresponding to the plurality of nozzle holes provided in the nozzle plate and communicate with the nozzle holes, and may be referred to as an ink flow path, a pressurizing chamber, a pressure chamber, an ejection chamber, a liquid chamber, or the like.
The pressure generating means generates pressure by applying a voltage with a basic drive waveform including a first drive pulse and a second drive pulse.
The pressure generating means is not particularly limited as long as the voltage of the drive waveform can be applied, and may be appropriately selected according to the purpose, and examples thereof include a piezoelectric element, heat, and the like. Among them, piezoelectric elements are preferable.
The basic drive waveform is explained with reference to fig. 3.
The basic drive waveform of fig. 3 is a drive waveform used for ejecting a droplet using an ejection head.
The basic drive waveform includes a waveform element S1 holding a reference voltage Vref, a waveform element S2 falling from the reference voltage Vref to the voltage Vx after the waveform element S1, a waveform element S3 holding the voltage Vx after the waveform element S2, a waveform element S4 rising to the voltage Vy after the waveform element S3, a waveform element S5 holding the voltage Vy after the waveform element S4, a waveform element S6 falling from the voltage Vy to the reference voltage Vref after the waveform element S5, a waveform element S7 holding the voltage Vref after the waveform element S6, a waveform element S8 falling from the reference voltage Vref to the voltage Vz after the waveform element S7, a waveform element S9 holding the voltage Vz after the waveform element S8, and a waveform element S10 rising to the reference voltage Vref after the waveform element S9.
In the case of ejecting liquid droplets using the above-described ejection head, it is general to eject main droplets and satellite droplets. The main droplet is the main droplet and the tiny droplets at the tail of the main droplet are satellites.
The basic drive waveform includes a first drive pulse P1 having a first waveform element and a second drive pulse P2 having a third waveform element.
The first waveform element is composed of waveform elements S1 to S4.
The first waveform element ejects the liquid droplets through the waveform elements S3 to S4 by applying a voltage greater than the reference voltage after applying a voltage smaller than the reference voltage. In addition, in the waveform element S4, by applying a voltage (high voltage) that is more positive than the reference voltage Vref, the landing position deviation between the main droplet and the satellite droplet is reduced, and the image quality is improved.
In the waveform element S4, when Vy = Vref, the driving waveform is a driving waveform not including the second waveform element, and the driving waveform including the second waveform element reduces the landing position deviation of the main droplet and the satellite droplet compared to the driving waveform not including the second waveform element, thereby improving the image quality. Since the landing positions of the main droplet and the satellite droplet can be prevented from being deviated, the landing positions are prevented from being deviated by using a drive waveform including a second waveform element.
The second waveform element is composed of waveform elements S5 to S7.
The second waveform element applies a voltage equal to or lower than a reference voltage after the first waveform element, and applies a voltage equal to or lower than a reference voltage Vref after the first waveform element.
The second waveform element is preferably applied to the liquid chamber from the start of the ejection of the liquid droplets by the first drive pulse by 1/2 or more, more preferably by 1/2 or more and 1 or less, of the natural vibration period. This reduces the positional deviation between the main droplet and the satellite droplet, and improves the image quality.
In the first waveform element and the second waveform element, it is preferable that Ta ≦ 1/2Tc (Tc: natural vibration period of liquid chamber) be satisfied as the time Ta (μ sec) required from the start of the waveform element S4 to the start of the waveform element S6. This accelerates the speed of the satellite, and thus can avoid a deviation in the landing positions of the main droplet and the satellite.
The natural vibration period is a time when the droplet velocity increases maximally for the time interval (Tb) between the drive pulse P1 and the drive pulse P2.
The natural vibration period is not particularly limited and may be appropriately selected according to the purpose, and is preferably 6 μ sec or more and 9 μ sec or less.
The third waveform element is composed of waveform elements S8 to S10.
The third waveform element pulls and pushes the meniscus on the nozzle surface without ejecting the droplet by applying a voltage (lower voltage) that is negative than the reference voltage Vref and a voltage equal to or higher than the reference voltage Vref to the liquid chamber.
In the waveform elements S8 to S10, when Vz = Vref, the driving waveform not including the third waveform element is obtained, but compared to the driving waveform not including the third waveform element, the driving waveform including the third waveform element can stabilize the vibration of the meniscus even when droplets are continuously ejected, avoid the occurrence of abnormal ejection such as non-ejection or meandering of ink droplets, and can print an image satisfactorily.
< stimulation generating organization >
The stimulus generating means generates a stimulus to be applied to the ink.
The stimulus in the stimulus generating means is not particularly limited, and may be appropriately selected according to the purpose, and examples thereof include heat (temperature), pressure, vibration, light, and the like. These may be used alone in 1 kind, or 2 or more kinds may be used in combination. Among them, heat and pressure are preferable. Examples of the stimulus generating means include a heating device, a pressurizing device, a piezoelectric element, a vibration generating device, an ultrasonic oscillator, and a lamp. Specifically, the stimulus generating means includes a piezoelectric actuator such as a piezoelectric element, a thermal actuator using an electrothermal conversion element such as a heating resistor and utilizing a phase change due to film boiling of ink, a shape memory alloy actuator using a metal phase change due to a temperature change, an electrostatic actuator using an electrostatic force, and the like.
When the stimulus is "heat", thermal energy corresponding to a recording signal is applied to the ink in the inkjet head using, for example, a thermal head. As a method of generating bubbles in the ink by the thermal energy, the ink is ejected as droplets from the nozzle holes of the nozzle plate by the pressure of the bubbles.
In the case where the stimulus is "pressure", for example, the piezoelectric element is bent by applying a voltage to the piezoelectric element, which is bonded to a position called a pressure chamber in an ink flow path within the inkjet head. And a method of ejecting the ink as droplets from the nozzle holes of the inkjet head by contracting the volume of the pressure chamber.
Among them, a piezoelectric system in which a voltage is applied to a piezoelectric element to fly ink is preferable.
< heating means >
The heating means is a means for heating the printing object. The heating means includes means for heating and drying the printing surface or the back surface of the recording medium to be printed, and examples thereof include an infrared heater, a warm air heater, and a heat roller. These may be used alone in 1 kind, or 2 or more kinds may be used in combination.
The method of drying the recording medium to be printed is not particularly limited and may be appropriately selected according to the purpose, and examples thereof include a method of bringing a heated fluid such as warm air as a drying means into contact with the recording medium to which the ink is applied, a method of bringing the recording medium to which the ink is applied into contact with a heating member and heating the recording medium by heat transfer, and a method of heating the recording medium to which the ink is applied by irradiating an energy ray such as infrared ray or far infrared ray. The heating may be performed before, during and/or after printing. The heating before and during printing enables printing on a heated medium, and the heating after printing enables drying of the printed matter.
The heating time is not particularly limited as long as the surface temperature of the recording medium can be controlled to a desired temperature, and can be appropriately selected according to the purpose.
The heating time is preferably controlled by controlling the transport speed of the recording medium to be printed.
< ink >
The ink preferably contains an organic solvent, a resin, water, a colorant and an additive. The ink is preferably an aqueous ink.
The viscosity of the ink at 25 ℃ is 9.0MPa · s or more and 11.0MPa · s or less, preferably 9.0MPa · s or more and 10.2MPa · s or less. When the viscosity at 25 ℃ is 9.0MPa · s or more and 11.0MPa · s or less, the continuous jet stability is improved.
The viscosity of the ink at 36 ℃ is 6.5MPa · s or more and 11.0MPa · s or less, and preferably 6.5MPa · s or more and 9.0MPa · s or less. When the viscosity at 25 ℃ is from 6.5 mPas to 11.0 mPas, the continuous jet stability is improved.
The viscosity of the ink is not particularly limited and may be appropriately selected according to the purpose, and for example, the viscosity can be measured using a rotational viscometer (RE-85, manufactured by eastern industries co., ltd.).
< organic solvent >
The type of the organic solvent is not particularly limited, and may be appropriately selected depending on the purpose, and examples thereof include ethers such as polyhydric alcohols, polyhydric alcohol alkyl ethers and polyhydric alcohol aryl ethers, nitrogen-containing heterocyclic compounds, amides, amines, and sulfur-containing compounds. These may be used alone in 1 kind, or 2 or more kinds may be used in combination.
The polyhydric alcohol is not particularly limited and may be appropriately selected depending on the purpose, and examples thereof include ethylene glycol, diethylene glycol, 1, 2-propanediol, 1, 3-propanediol, 1, 2-butanediol, 1, 3-butanediol, 1, 4-butanediol, 2, 3-butanediol, 3-methyl-1, 3-butanediol, triethylene glycol, polyethylene glycol, polypropylene glycol, 1, 2-pentanediol, 1, 3-pentanediol, 1, 4-pentanediol, 2, 4-pentanediol, 1, 5-pentanediol, 1, 2-hexanediol, 1, 6-hexanediol, 1, 3-hexanediol, 2, 5-hexanediol, 1, 5-hexanediol, glycerol, 1,2, 6-hexanetriol, 2-ethyl-1, 3-hexanediol, ethyl-1, 2, 4-butanetriol, 1,2, 3-butanetriol, 2, 4-trimethyl-1, 3-pentanediol, and Petriol.
The polyhydric alcohol alkyl ethers are not particularly limited and may be appropriately selected according to the purpose, and examples thereof include ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, tetraethylene glycol monomethyl ether, and propylene glycol monoethyl ether.
The polyhydric alcohol aryl ether is not particularly limited and may be appropriately selected according to the purpose, and examples thereof include ethylene glycol monophenyl ether and ethylene glycol monobenzyl ether.
The nitrogen-containing heterocyclic compound is not particularly limited and may be appropriately selected according to the purpose, and examples thereof include 2-pyrrolidone, N-methyl-2-pyrrolidone, N-hydroxyethyl-2-pyrrolidone, 1, 3-dimethyl-2-imidazolidinone, epsilon-caprolactam, and gamma-butyrolactone.
The amide is not particularly limited and may be appropriately selected according to the purpose, and examples thereof include formamide, N-methylformamide, N-dimethylformamide, 3-methoxy-N, N-dimethylpropionamide, and 3-butoxy-N, N-dimethylpropionamide.
The amine is not particularly limited and may be appropriately selected according to the purpose, and examples thereof include monoethanolamine, diethanolamine, and triethylamine.
The sulfur-containing compounds are not particularly limited and may be appropriately selected according to the purpose, and examples thereof include dimethyl sulfoxide, sulfolane, thiodiethanol, and the like.
Examples of the other organic solvent include propylene carbonate and ethylene carbonate. It is preferable to use an organic solvent having a boiling point of 250 ℃ or lower, in view of not only the function as a wetting agent but also good drying performance.
As the organic solvent, a polyhydric alcohol compound having 8 or more carbon atoms and a glycol ether compound are also suitably used. Specific examples of the polyhydric alcohol compound having 8 or more carbon atoms include 2-ethyl-1, 3-hexanediol, 2, 4-trimethyl-1, 3-pentanediol and the like.
Specific examples of the glycol ether compound include polyhydric alcohol alkyl ethers such as ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, tetraethylene glycol monomethyl ether, and propylene glycol monoethyl ether, and polyhydric alcohol aryl ethers such as ethylene glycol monophenyl ether and ethylene glycol monobenzyl ether.
The boiling point of the organic solvent is not particularly limited and may be appropriately selected depending on the purpose, and is preferably 270 ℃ or higher. By containing the organic solvent at 270 ℃ or higher in the ink, sufficient fixing properties to wallpaper and canvas fabrics can be secured, and drying near the nozzles can be suppressed to reduce jetting defects.
The content of the organic solvent at 270 ℃ or higher is not particularly limited and may be appropriately selected according to the purpose, and is preferably 6% by mass or higher, and more preferably 10% by mass or higher, relative to the ink.
< resin >
The resin is not particularly limited and may be appropriately selected according to the purpose, and examples thereof include urethane resins, polyester resins, acrylic resins, vinyl acetate resins, styrene resins, butadiene resins, styrene-butadiene resins, vinyl chloride resins, acrylic styrene resins, acrylic silicone resins, and the like, and resin particles made of these resins may also be used. Among them, polyurethane resins are preferred.
The resin particles may be appropriately synthesized or may be commercially available. These may be used alone in 1 kind, or in combination of 2 or more kinds.
The resin particles may be mixed with a material such as a coloring material or an organic solvent in the state of a resin emulsion in which the resin particles are dispersed with water as a dispersion medium.
The type of the polyurethane resin is not particularly limited and may be appropriately selected according to the purpose, and examples thereof include polyether polyurethane resins, polyester polyurethane resins, and polycarbonate polyurethane resins.
The polyurethane resin is a reaction product of polyisocyanate and polyol, and can exhibit the respective properties of a soft segment composed of a polyol component having a weak cohesive force and a hard segment composed of a urethane bond having a strong cohesive force. The soft segment is soft and resistant to deformation of the base material such as stretching or bending. On the other hand, the hard segment has high adhesion to the base material and good wear resistance.
The content of the resin is preferably 10% by mass or less with respect to the ink in view of drying property.
The volume average particle diameter of the resin particles is not particularly limited and may be appropriately selected according to the purpose, but is preferably 10nm or more and 1,000nm or less, more preferably 10nm or more and 200nm or less, and particularly preferably 10nm or more and 100nm or less, from the viewpoint of obtaining good fixing properties and high image density.
The volume average particle diameter can be measured, for example, by using a particle size analyzer (nanotrac wave-UT151, manufactured by microtrac bell corporation).
< Water >
The content of the water is not particularly limited and may be appropriately selected depending on the purpose, but is preferably 10% by mass or less with respect to the ink in view of the drying property and ejection reliability of the ink.
< color >
The coloring material is not particularly limited and may be appropriately selected according to the purpose, and examples thereof include pigments and dyes.
As the pigment, an inorganic pigment or an organic pigment can be used. These may be used alone in 1 kind, or 2 or more kinds may be used in combination. Further, as the pigment, mixed crystals may be used.
The pigment is not particularly limited and may be appropriately selected according to the purpose, and for example, a black pigment, a yellow pigment, a magenta pigment, a cyan pigment, a white pigment, a green pigment, an orange pigment, a glossy pigment such as gold or silver, a metallic pigment, or the like can be used.
The inorganic pigment is not particularly limited and may be appropriately selected according to the purpose, and examples thereof include titanium oxide, iron oxide, calcium carbonate, barium sulfate, aluminum hydroxide, barium yellow, cadmium red, chrome yellow, and carbon black.
The carbon black can be produced by a known method such as a contact method, a furnace method, or a thermal method.
As the organic pigment, azo pigments, polycyclic pigments (for example, phthalocyanine pigments, perylene pigments, pyrene pigments, anthraquinone pigments, quinacridone pigments, dioxazine pigments, indigo pigments, thioindigo pigments, isoindolinone pigments, quinophthalone pigments, etc.), dye chelates (for example, basic dye type chelates, acidic dye type chelates, etc.), nitro pigments, nitroso pigments, aniline black, etc. can be used. Among these pigments, a pigment having good affinity with a solvent is preferably used. In addition, resin hollow particles and inorganic hollow particles may be used.
Specific examples of the pigment include black pigments such as carbon blacks (c.i. pigment black 7) including furnace black, lamp black, acetylene black, and channel black, metals including copper, iron (c.i. pigment black 11), and titanium oxide, and organic pigments such as aniline black (c.i. pigment black 1).
Further, as a color pigment, there are c.i. pigment yellow 1,3,12,13,14,17,24,34,35,37,42 (yellow iron oxide), 53,55,74,81,83,95,97,98,100,101,104,108,109,110,117,120,138,150,153,155,180,185,213, c.i. pigment orange 5,13,16,17,36,43,51, c.i. pigment red 1,2,3,5,17,22,23,31,38,48 (permanent red 2B (Ca)), 48, 3,48, 4,49, 1,52, 53,1, 57.
The dye is not particularly limited, and an acid dye, a direct dye, a reactive dye and a basic dye may be used, and one of them may be used alone, or two or more thereof may be used in combination.
Examples of the dye include c.i. acid yellow 17,23,42,44,79,142, c.i. acid red 52,80,82,249,254,289, c.i. acid blue 9,45,249, c.i. acid black 1,2,24,94, c.i. cover black 1,2, c.i. direct yellow 1,12,24,33,50,55,58,86,132,142,144,173, c.i. direct red 1,4,9,80,81,225,227, c.i. direct blue 1,2,15,71,86,87,98,165,199,202, c.i. direct black 19,38,51,71,154,168,171,195, c.i. reaction red 14,32,55,79,249, c.i. reaction black 3,4,35.
The content of the coloring material in the ink is preferably 15% by mass or less from the viewpoint of good fixing property and ejection stability. More preferably 10% by mass or less. The coloring material content of 0% by mass means that the ink can be used as a transparent ink containing no coloring material.
Examples of a method for obtaining an ink by dispersing a pigment include a method of introducing a hydrophilic functional group into a pigment to form a self-dispersible pigment, a method of coating the surface of a pigment with a resin to disperse the pigment, and a method of dispersing the pigment using a dispersant.
Examples of the method for introducing a hydrophilic functional group into a pigment to form a self-dispersible pigment include a method in which a functional group such as a sulfonic acid group or a carboxyl group is added to a pigment (e.g., carbon) to thereby disperse the pigment in water.
As a method of coating the surface of the pigment with a resin and dispersing the surface, a method of containing the pigment in microcapsules and dispersing the microcapsules in water may be mentioned. This may be said in other words to be a resin-coated pigment. In this case, the pigment to be blended in the ink need not be entirely coated with the resin, and an uncoated pigment or a pigment partially coated may be dispersed in the ink within a range not to impair the effect of the present invention.
Examples of the method of dispersing by using a dispersant include a method of dispersing by using a well-known low-molecular dispersant such as a surfactant and a method of dispersing by using a high-molecular dispersant.
The dispersant may be used according to the pigment, and for example, an anionic surfactant, a cationic surfactant, an amphoteric surfactant, a nonionic surfactant, or the like can be used.
As the dispersant, RT-100 (nonionic surfactant) manufactured by bamboo fat and oil Co., ltd., or a sodium naphthalenesulfonate formalin condensate can be suitably used. The dispersant may be used alone in 1 kind, or may be used in combination of 2 or more kinds.
< pigment Dispersion >
The pigment may be mixed with a material such as water or an organic solvent to obtain an ink. Further, the ink may be produced by mixing a pigment dispersion prepared by mixing a pigment with other water, a dispersant, or the like, with a material such as water or an organic solvent.
The pigment dispersion can be obtained by mixing, dispersing water, a pigment dispersant, and other components as needed, and adjusting the particle size. A disperser may be used for dispersion.
The particle size of the pigment in the pigment dispersion is not particularly limited, but the maximum frequency in terms of the maximum number is preferably 20nm to 500nm, and more preferably 20nm to 150nm, from the viewpoint of good dispersion stability of the pigment, and improvement in image quality such as ejection stability and image density. The particle size of the pigment can be measured using a particle size analyzer (NanotrcWave-UT 151, manufactured by MicrotracBell).
The content of the pigment in the pigment dispersion is not particularly limited, and may be appropriately selected according to the purpose, and is preferably 0.1 mass% or more and 50 mass% or less, and more preferably 0.1 mass% or more and 30 mass% or less, from the viewpoint of obtaining good ejection stability and improving image density.
It is preferable that the pigment dispersion is degassed by filtering coarse particles with a filter, a centrifugal separator, or the like, as necessary.
The particle size of the solid matter in the ink is not particularly limited and may be appropriately selected depending on the purpose. From the viewpoint of improving image quality such as ejection stability and image density, the maximum frequency of the particle size of the solid matter in the ink is preferably 20nm to 1000nm, more preferably 20nm to 150nm in terms of the maximum number. The solid material includes resin particles, particles of a pigment, and the like. The particle diameter can be measured using a particle size analyzer (Nanotrcwave-UT 151, microtracBell).
< additives >
If necessary, a surfactant, an antifoaming agent, an antiseptic and antifungal agent, a rust inhibitor, a pH adjuster, and the like may be added to the ink.
< surfactant >
As the surfactant, any of a silicon surfactant, a fluorine surfactant, an amphoteric surfactant, a nonionic surfactant, and an anionic surfactant can be used.
The silicon surfactant is not particularly limited and may be appropriately selected according to the purpose. Among them, preferred is a surfactant that does not decompose even at high pH. Examples of the silicon surfactant include side chain-modified polydimethylsiloxane, both-end-modified polydimethylsiloxane, single-end-modified polydimethylsiloxane, and both-end-modified polydimethylsiloxane. The modified group includes a polyoxyethylene group and a polyoxyethylene polyoxypropylene group, but is preferably a modified group which exhibits good properties as a water surfactant. Further, as the silicon surfactant, a polyether-modified silicon surfactant may be used, and examples thereof include a compound in which a polyalkylene oxide structure is introduced into a side chain of a Si portion of dimethylsiloxane.
As the fluorosurfactant, for example, a perfluoroalkylsulfonic acid compound, a perfluoroalkylcarboxylic acid compound, a perfluoroalkylphosphate compound, a polyoxyalkylene ether polymer compound having a perfluoroalkyl ethylene oxide adduct and a perfluoroalkyl ether group in a side chain are particularly preferable because of small foaming property.
Examples of the perfluoroalkyl sulfonic acid compound include perfluoroalkyl sulfonic acid and perfluoroalkyl sulfonate. Examples of the perfluoroalkyl carboxylic acid compound include perfluoroalkyl carboxylic acids and perfluoroalkyl carboxylates. Examples of the polyoxyalkylene ether polymer compound having a perfluoroalkyl ether group in the side chain include sulfuric acid ester salts of polyoxyalkylene ether polymers having a perfluoroalkyl ether group in the side chain, and salts of polyoxyalkylene ether polymers having a perfluoroalkyl ether group in the side chain. Examples of the counter ion of the salt in the fluorine surfactant include Li, na, K and NH 4 、NH 3 CH 2 CH 2 OH、NH 2 (CH 2 CH 2 OH) 2 、NH(CH 2 CH 2 OH) 3 And the like.
Examples of the amphoteric surfactant include lauryl aminopropionate, lauryl dimethyl betaine, stearyl dimethyl betaine, and lauryl dihydroxyethyl betaine.
Examples of the nonionic surfactant include polyoxyethylene alkylphenyl ethers, polyoxyethylene alkyl esters, polyoxyethylene alkylamines, polyoxyethylene alkylamides, polyoxyethylene propylene block polymers, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, and ethylene oxide adducts of acetylene alcohols.
Examples of the anionic surfactant include polyoxyethylene alkyl ether acetate, dodecylbenzene sulfonate, laurate, and polyoxyethylene alkyl ether sulfate. These may be used alone in 1 kind, or 2 or more kinds may be used in combination.
The silicon surfactant is not particularly limited and may be appropriately selected according to the purpose, and examples thereof include side chain-modified polydimethylsiloxane, both-end-modified polydimethylsiloxane, one-end-modified polydimethylsiloxane, side chain both-end-modified polydimethylsiloxane, and the like, and a polyether-modified silicon surfactant having a polyoxyethylene group or a polyoxyethylene polyoxypropylene group as a modifying group is particularly preferable because it shows good properties as a water surfactant.
As such a surfactant, a commercially available surfactant may be used, or a suitably synthesized surfactant may be used. Commercially available products are available from BYK-Chemie, shin-Etsu chemical Co., ltd, dow Corning Toray Silicone Co., ltd, nihon emulsion Ltd, kyoho chemical Co., ltd, and the like.
The polyether-modified silicon surfactant is not particularly limited and may be appropriately selected according to the purpose. As the polyether-modified silicon surfactant, commercially available products can be used, and examples thereof include KF-618, KF-642, KF-643 (shin-Etsu chemical Co., ltd.), EMLEX-SS-5602, SS-1906EX (Nihon emulsion Co., ltd.), FZ-2105, FZ-2118, FZ-2154, FZ-2161, FZ-2162, FZ-2163, FZ-2164 (Dow Corning Toray Silicone Co., ltd.), BYK-33, BYK-387 (BYK-Chemie Co., ltd.), TSF4440, TSF4452 and TSF4453 (Toshiba silicon Co., ltd.).
The fluorinated surfactant is preferably a compound having 2 to 16 carbon atoms substituted with fluorine, and more preferably a compound having 4 to 16 carbon atoms substituted with fluorine.
Examples of the fluorinated surfactant include perfluoroalkyl phosphate ester compounds, perfluoroalkyl ethylene oxide adducts, and polyoxyalkylene ether polymer compounds having a perfluoroalkyl ether group in the side chain. Among them, a polyoxyalkylene ether polymer compound having a perfluoroalkyl ether group in a side chain is preferable because of low foaming property.
As the above-mentioned fluorinated surfactant, commercially available products can be used. Examples of commercially available products include SurflonS-111, S-112, S-113, S-121, S-131, S-132, S-141 and S-145 (all manufactured by AGC Co., ltd.); fludardFC-93, FC-95, FC-98, FC-129, FC-135, FC-170C, FC-430 and FC-431 (all manufactured by Sumitomo 3M Co., ltd.); megafacF-470, F-1405 and F-474 (all manufactured by Dainippon ink chemical Co., ltd.); zonylTBS, FSP, FSA, FSN-100, FSN, FSO-100, FSO, FS-300, UR, capstoneFS-30, FS-31, FS-3100, FS-34, FS-35 (all manufactured by Chemours); FT-110, FT-250, FT-251, FT-400S, FT-150, FT-400SW (all manufactured by Nippon Kabushiki Kaisha, inc.), polyfox PF-136A, PF-156A, PF-151N, PF-154, PF-159 (manufactured by Omnova, inc.), unidyne DSN-403N (manufactured by Kingchi Kogyo Co., ltd.), and the like, among them, FS-3100, FS-34, FS-300, FT-110, FT-250, FT-251, FT-400S, FT-150, FT-400SW, polyfoxPF-151N manufactured by Omnova, and UnidyneDSN-403N manufactured by Kingchi Kogyo, are particularly preferable from the viewpoint of remarkably improving the good printing quality, particularly the color developability, the permeability, the wettability and the leveling property of paper.
The content of the surfactant in the ink is not particularly limited, and may be appropriately selected according to the purpose, and is preferably 0.001 mass% or more and 5 mass% or less, and more preferably 0.05 mass% or more and 5 mass% or less, from the viewpoints of good wettability and ejection stability and improvement in image quality.
< antifoaming agent >
The defoaming agent is not particularly limited, and examples thereof include a silicon defoaming agent, a polyether defoaming agent, and a fatty acid ester defoaming agent. These may be used alone in 1 kind, or 2 or more kinds may be used in combination. Among these, silicon-based defoaming agents are preferable in terms of their good defoaming effect.
< antiseptic and antifungal Agents >
The preservative and antifungal agent is not particularly limited, and examples thereof include 1, 2-benzisothiazolin-3-one and the like.
< anticorrosive agent >
The rust inhibitor is not particularly limited, and examples thereof include acid sulfite and sodium thiosulfate.
< pH adjuster >
The pH adjuster is not particularly limited as long as it can adjust the pH to 7 or more, and examples thereof include amines such as diethanolamine and triethanolamine.
The pH of the ink is preferably 7 to 12, more preferably 8 to 11, from the viewpoint of preventing corrosion of a metal member which contacts a liquid.
< object of printing >
The printing target is not limited to the printing target used as a recording medium, and for example, wallpaper, floor materials, building materials such as tiles, cloth for clothing such as T-shirts, textiles, leather, and the like can be used as appropriate. Further, by adjusting the configuration of the path for conveying the recording medium, ceramics, glass, metal, or the like can be used as the printing target. The recording medium is not particularly limited, and plain paper, glossy paper, special paper, cloth, and the like can be used, and favorable image formation can be performed even when an impermeable base material is used. The non-permeable substrate is a substrate having low water permeability and low absorbency on the surface, and includes a material which does not open to the outside even if many voids are present inside, and more specifically, a substrate having a water absorption of 10mL/m2 or less from the start of contact to 30msec1/2 in the Bristow method. As the impermeable base material, for example, plastic films such as vinyl chloride resin films, polyethylene terephthalate (PET) films, acrylic resin films, polypropylene films, polyethylene films, and polycarbonate films can be suitably used.
< recording apparatus, recording method >
In the following description of the recording apparatus and the recording method, the case of using the black (K) ink, the cyan (C) ink, the magenta (M) ink, and the yellow (Y) ink is described, but a nonaqueous transparent ink may be used instead of these inks or in addition to these inks. The nonaqueous clear ink used in the present invention can be suitably used in various recording apparatuses of an inkjet recording method, for example, printers, facsimile apparatuses, copying apparatuses, printer/facsimile/copier multifunction peripherals, stereolithography apparatuses, and the like. The ink jet recording apparatus includes, unless otherwise specified, either a serial type apparatus that moves a head or a line type apparatus that does not move a head. Further, the inkjet recording apparatus includes not only a desktop type recording apparatus but also a wide format recording apparatus, for example, a continuous printer which can use a continuous paper wound in a roll shape as a recording medium. In the present invention, the recording apparatus and the recording method refer to an apparatus capable of ejecting ink, various processing liquids, and the like onto a recording medium, and a method of recording using the apparatus. The recording medium refers to a medium to which ink and various processing liquids can adhere even temporarily. This recording apparatus includes not only a head portion for ejecting ink but also mechanisms related to feeding, conveying, and discharging of a recording medium, and apparatuses called a pre-processing apparatus and a post-processing apparatus. The recording apparatus and the recording method are not limited to those for visualizing meaningful images such as characters and graphics with ink. For example, the present invention also includes a pattern such as a geometric pattern, and a case where a three-dimensional image is formed. The inkjet recording apparatus includes, but is not limited to, a serial type apparatus that moves a head and a line type apparatus that does not move a head. Further, the recording apparatus includes not only a desktop recording apparatus but also a wide recording apparatus capable of printing on an A0-size recording medium, for example, a continuous printer capable of using a continuous paper wound in a roll as a recording medium.
An example of a recording apparatus is explained with reference to fig. 1 to 2. Fig. 1 is a perspective view illustrating a recording apparatus. Fig. 2 is a perspective view illustrating the main tank. The image forming apparatus 400 as an example of a recording apparatus is a serial type image forming apparatus. A mechanism portion 420 is provided in the housing 401 of the image forming apparatus 400. Each ink containing portion 411 of the main tanks 410 (410K, 410C, 410M, 410Y) for each color of black (K), cyan (C), magenta (M), yellow (Y), and the like is formed of a packaging member such as an aluminum laminated film, for example. The ink storage portion 411 is stored in a storage container cartridge 414 made of plastic, for example. Thereby, the main tank 410 is used as ink cartridges of the respective colors. On the other hand, an ink cartridge holding member 404 is provided on the back side of the opening when the cover 401c of the apparatus main body is opened. The main tank 410 is detachably mounted on the ink cartridge holding member 404. Accordingly, the ink discharge ports 413 of the main tank 410 communicate with the ejecting heads 434 for the respective colors via the supply hoses 436 for the respective colors, and the ink can be ejected from the ejecting heads 434 to the recording medium.
In the wording of the present invention, image formation, recording, printing, and the like are synonymous terms. Recording medium, and printing object are synonyms.
[ examples ] A method for producing a compound
The following examples of the present invention are illustrative, but the present invention is not limited to these examples.
Preparation example 1 of polyurethane resin
In a nitrogen purged vessel equipped with a thermometer, a nitrogen introducing tube and a stirrer, 200.4g of polyester polyol (trade name: polylatiod-X-2251, manufactured by DIC corporation, average molecular weight 2000), 15.7g of 2, 2-dimethylolpropionic acid, 48.0g of isophorone diisocyanate, 77.1g of methyl ethyl ketone as an organic solvent and 0.06g of DMTDL (dibutyltin dilaurate) as a catalyst were mixed and reacted for 4 hours. Then, 30.7g of methyl ethyl ketone was added as a diluent, and when the average molecular weight reached the range of 20000 to 60000, 1.4g of methanol was added to complete the reaction, thereby obtaining an organic solvent solution of a polyurethane resin.
To the obtained organic solvent solution of polyurethane resin were added 13.4g of a 48 mass% potassium hydroxide aqueous solution and 715.3g of water, followed by sufficient stirring, aging and desolventization to prepare polyurethane resin a.
The minimum film-forming temperature (MFT) of the obtained polyurethane resin emulsion a was measured using a film-forming temperature test apparatus (manufactured by mitsui corporation), and was 74 ℃.
(preparation example 2 of polyurethane resin)
In a nitrogen-purged container equipped with a thermometer, a nitrogen-introducing tube and a stirrer, 1500g of polycarbonate (reaction product of 1, 6-hexanediol and dimethyl carbonate (number average molecular weight (Mn): 1200)), 220g of 2, 2-dimethylolpropionic acid (DMPA) and 1347g of N-methylpyrrolidone (NMP) were mixed under a nitrogen stream, and heated to 60 ℃ to dissolve the DMPA. Then, 1445g of 4,4' -dicyclohexylmethane diisocyanate and 2.6g of dibutyltin dilaurate as a catalyst were added, and the mixture was heated to 90 ℃ and reacted for 5 hours to obtain an isocyanate-terminated urethane prepolymer. The obtained isocyanate terminal urethane prepolymer was cooled to 80 ℃, and 149g of triethylamine was added and mixed to obtain a mixture. To 4340g of the obtained mixture were added 5400g of water, 15g of triethylamine, 1500g of ice, and 626g of 35 mass% aqueous 2-methyl-1, 5-pentanediamine solution to conduct a chain extension reaction, thereby preparing a polyurethane resin B.
The minimum film-forming temperature (MFT) of the obtained polyurethane resin emulsion B was measured using a film-forming temperature test apparatus (manufactured by mitsui corporation), and the result was 55 ℃.
(production example 1 of Black ink)
As shown in Table 1 below, a black pigment dispersion was obtained by premixing 3 parts by weight of a black pigment (carbon black), 0.5 part by weight of a dispersant (trade name: pioneera-51-B, manufactured by bamboo oil and fat Co., ltd., a polyester-based compound) and 58.5 parts by weight of diethylene glycol diethyl ether and circulating and dispersing the premixed mixture in a disk bead mill (manufactured by Shinmaru enterprises, KDL type, medium: using zirconia balls having a diameter of 0.3 mm) for 3 hours.
Then, 18.7 parts by mass of the obtained black pigment dispersion, 17.1 parts by mass of a polyurethane resin emulsion a, 20.6 parts by mass of a polyurethane resin emulsion B, 0.3 part by mass of 2-amino-2-ethyl-1, 3-propanediol (AEPD, manufactured by tokyo chemical corporation), 1.2 parts by mass of glycerin, 29.0 parts by mass of isoprene glycol, 0.8 part by mass of a silicon surfactant (trade name: KF-643, manufactured by shin-koku corporation), 0.2 part by mass of a defoaming agent (trade name: surfynol ad01, manufactured by shin-koku corporation), and 12.1 parts by mass of water were mixed and stirred to prepare a mixture. The resulting mixture was filtered through a polypropylene filter (trade name: betafine polypropylene pleated filter PPG series, 3M) having an average pore diameter of 0.2 μ M to prepare black ink A.
The viscosity of the obtained black ink A was measured using a rotary viscometer (RE-85, manufactured by Toyobo industries Co., ltd.), and as a result, the viscosity at 25 ℃ was 10.1 mPas and the viscosity at 36 ℃ was 6.6 mPas.
(production examples 2 to 8 of Black ink)
Black inks B to H were prepared in the same manner as in production example 1 of black ink, except that the ink composition shown in table 1 was changed in production example 1 of black ink. The viscosities of the obtained black inks B to H were measured in the same manner as in production example 1 of the black ink. The measurement results are shown in table 1.
TABLE 1
(examples 1 to 12 and comparative examples 1 to 20)
Any of the black inks a to H was introduced into a droplet observation apparatus (EV 2500, manufactured by mitsui corporation), and a voltage was applied to the liquid chamber with any of the basic drive waveforms shown in table 2 to eject droplets. Combinations of the basic drive waveforms and the black inks in examples 1 to 12 and comparative examples 1 to 20 are shown in tables 2 to 4.
Further, the natural vibration period Tc in the liquid chamber of the droplet observation device (EV 2500, manufactured by mitsui corporation) was 6.0 (μ sec).
Fig. 4 shows basic drive waveforms in embodiment 1. P1 in fig. 4 is a first drive pulse, and P2 is a second drive pulse. P0 in fig. 4 is a general drive waveform, and is not a necessary drive waveform.
TABLE 2
TABLE 3
| Basic drive waveform | Black ink | |
| Example 1 | 1 | A |
| Example 2 | 1 | D |
| Example 3 | 1 | E |
| Comparative example 1 | 1 | B |
| Comparative example 2 | 1 | C |
| Comparative example 3 | 1 | F |
| Comparative example 4 | 1 | G |
| Example 4 | 1 | H |
| Comparative example 5 | 2 | B |
| Comparative example 6 | 2 | C |
| Comparative example 7 | 2 | F |
| Comparative example 8 | 2 | G |
| Comparative example 9 | 2 | H |
| Comparative example 10 | 3 | B |
| Comparative example 11 | 3 | C |
| Comparative example 12 | 3 | F |
| Comparative example 13 | 3 | G |
TABLE 4
| Basic drive waveform | Black ink | |
| Example 5 | 3 | H |
| Comparative example 14 | 4 | B |
| Comparative example 15 | 4 | C |
| Comparative example 16 | 4 | F |
| Comparative example 17 | 4 | G |
| Example 6 | 4 | H |
| Comparative example 18 | 2 | A |
| Comparative example 19 | 2 | D |
| Comparative example 20 | 2 | E |
| Example 7 | 3 | A |
| Example 8 | 3 | D |
| Example 9 | 3 | E |
| Example 10 | 4 | A |
| Example 11 | 4 | D |
| Example 12 | 4 | E |
For examples 1 to 12 and comparative examples 1 to 20, "ligament length", "continuous ejection stability", and "variation in droplet velocity" were evaluated based on the following evaluation methods. The results are shown in tables 5 and 6.
< ligament Length >
With respect to examples 1 to 12 and comparative examples 1 to 20, the time elapsed from the passage of the main droplet to the passage of the rear end of the satellite droplet at the point of 2mm drop from the nozzle surface was measured using EV2500 (manufactured by mitsunsho corporation), and the ligament length was evaluated based on the following evaluation criteria. "Δ" or more is practical.
(evaluation criteria)
No satellite drop
Delta the time elapsed with the satellite drop until the trailing end of the satellite drop passes is less than 20 mus
Wherein the time elapsed until the rear end of the satellite droplet passes is 20 μ s or more
< continuous spray stability >
For examples 1 to 12 and comparative examples 1 to 20, the proportion of the nozzle holes from which droplets were continuously ejected at the time of ejecting droplets for 1 hour was measured, and b5 was evaluated for continuous ejection stability based on the following evaluation criteria. "Δ" or more is practical.
(evaluation criteria)
O: the ratio of the nozzle holes continuing injection is 100% Δ, the ratio of the nozzle holes continuing injection is 90% or more and less than 100% x, and the ratio of the nozzle holes continuing injection is less than 90%
< variation in droplet velocity >
In the basic drive waveform shown in fig. 4, the time Tj elapsed until the main droplet passes through the point a that is dropped from the nozzle surface by a certain distance is measured under the following conditions (i), (ii), and (iii), and the variation in droplet velocity is evaluated based on the following evaluation criterion for the largest difference (Δ Tj) among the differences of Tj under the following conditions (i), (ii), and (iii). ". Smallcircle" is practical.
(i) The injection is performed using a drive waveform including only P1.
(ii) The injection is performed using a drive waveform including P0 and P1.
(iii) The injection is performed using a drive waveform including P0, P1, and P2.
(evaluation criteria)
○:ΔTj<20
×:ΔTj≥20
TABLE 5
TABLE 6
The present invention is, for example, as follows.
<1>
Using an ink jet recording apparatus including a nozzle plate having nozzles for ejecting ink containing a resin, an organic solvent, and water, a liquid chamber communicating with the nozzles, and a head having a pressure generating mechanism for generating pressure in the liquid chamber,
the ink is ejected by applying a first drive pulse and a second drive pulse by a pressure generating mechanism,
the ink has a viscosity of 9.0MPa · s or more and 11.0MPa · s or less at 25 ℃ and a viscosity of 6.5MPa · s or more and 11.0MPa · s or less at 36 ℃,
the inkjet recording method is characterized by satisfying the following conditions (1) and (2):
(1) The first drive pulse includes a first waveform element to which a voltage smaller than a reference voltage is applied and then a voltage exceeding the reference voltage is applied, and a second waveform element to which a voltage equal to or smaller than the reference voltage is applied after the first waveform element.
(2) The second drive pulse includes a third waveform element for pulling and pushing the meniscus on the nozzle surface without ejecting the ink.
<2>
According to the inkjet recording method of <1>, the second drive pulse is applied within 1/2 of the natural vibration period of the liquid chamber from the start of ejection of liquid droplets by the first drive pulse.
<3>
According to the inkjet recording method of <1>, the second drive pulse is applied at 1/2 or more and 1 or less of the natural vibration period of the liquid chamber from the start of ejection of liquid droplets by the first drive pulse.
<4>
The inkjet recording method according to any one of <1> to <3>, wherein the pressure generating mechanism is a piezoelectric element.
<5>
The inkjet recording method according to any one of <1> to <4>, wherein a content of the resin is 10% by mass or more with respect to the ink.
<6>
The inkjet recording method according to any one of <1> to <5 >: the ink contains at least one polyurethane resin.
<7>
An inkjet recording apparatus comprising:
ink containing resin, organic solvent and water, and
an ejection head including a nozzle plate having nozzles that eject the ink liquid, a liquid chamber communicating with the nozzles, and a pressure generation mechanism that generates pressure in the liquid chamber,
ejecting ink by applying a first drive pulse and a second drive pulse through the pressure generating mechanism,
the ink has a viscosity of 9.0 MPa-s to 11.0 MPa-s at 25 ℃, a viscosity of 6.5 MPa-s to 11.0 MPa-s at 36 ℃,
the following conditions (1) and (2) are satisfied:
(1) The first drive pulse includes a first waveform element to which a voltage exceeding a reference voltage is applied after a voltage smaller than the reference voltage is applied, and a second waveform element to which a voltage equal to or lower than the reference voltage is applied after the first waveform element;
(2) The second drive pulse includes a third waveform element for pulling and pushing out the meniscus on the nozzle surface without ejecting the ink.
The ink jet recording method of any one of the above <1> to <6> and the ink jet recording apparatus of the above <7> can solve the above-described various problems in the related art, and achieve the object of the present invention.
Claims (7)
1. An ink jet recording method using an ink jet recording apparatus having an ejection head including a nozzle plate having nozzles for ejecting ink containing a resin, an organic solvent, and water, a liquid chamber communicating with the nozzles, and a pressure generating mechanism for generating pressure in the liquid chamber,
ejecting ink by applying a first drive pulse and a second drive pulse through the pressure generating mechanism,
the inkjet recording method is characterized in that:
the ink has a viscosity of 9.0MPa · s to 11.0MPa · s at 25 ℃, and a viscosity of 6.5MPa · s to 11.0MPa · s at 36 ℃,
the inkjet recording method satisfies the following conditions (1) and (2):
(1) The first drive pulse includes a first waveform element to which a voltage exceeding a reference voltage is applied after a voltage smaller than the reference voltage is applied, and a second waveform element to which a voltage equal to or lower than the reference voltage is applied after the first waveform element;
(2) The second drive pulse includes a third waveform element for pulling and pushing out the meniscus on the nozzle surface without ejecting the ink.
2. The inkjet recording method according to claim 1, characterized in that:
the second drive pulse is applied at 1/2 or less of the natural vibration period of the liquid chamber from the start of the ejection of ink by the first drive pulse.
3. The inkjet recording method as claimed in claim 1 or 2, characterized in that:
the second drive pulse is applied at 1/2 or more and 1 or less of the natural vibration period of the liquid chamber from the start of the ejection of ink by the first drive pulse.
4. The inkjet recording method according to any one of claims 1 to 3, characterized in that:
the pressure generating mechanism is a piezoelectric element.
5. The inkjet recording method according to any one of claims 1 to 4, characterized in that:
the content of the resin is 10 mass% or more.
6. The inkjet recording method according to any one of claims 1 to 5, characterized in that:
the resin contains a polyurethane resin.
7. An inkjet recording apparatus comprising:
ink containing resin, organic solvent and water, and
an ejection head including a nozzle plate having nozzles that eject the ink, a liquid chamber communicating with the nozzles, and a pressure generating mechanism that generates pressure in the liquid chamber,
ejecting ink by applying a first drive pulse and a second drive pulse through the pressure generating mechanism,
the inkjet recording apparatus is characterized in that:
the ink has a viscosity of 9.0MPa · s to 11.0MPa · s at 25 ℃, and a viscosity of 6.5MPa · s to 11.0MPa · s at 36 ℃,
the following conditions (1) and (2) are satisfied:
(1) The first drive pulse includes a first waveform element to which a voltage exceeding a reference voltage is applied after a voltage smaller than the reference voltage is applied, and a second waveform element to which a voltage equal to or smaller than the reference voltage is applied after the first waveform element;
(2) The second drive pulse includes a third waveform element for pulling and pushing out the meniscus on the nozzle surface without ejecting the ink.
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