JP2021091128A - Liquid discharging device, liquid discharging method, printer, printing method and glossiness control method of printing image - Google Patents

Abstract

To provide a liquid discharging device which can support glossiness control for both of matte (low-gloss) tone and gloss (high-gloss) tone, in which there is a large difference between the matte tone and the gloss tone, and which can obtain a highly decorative image.SOLUTION: A liquid discharging device comprises: a liquid storage part which stores liquid; a liquid discharge head which discharges the liquid to a printed object; and heating means which heats the printed object. The liquid is clear ink which contains resin, water and polyether-modified siloxane compound. The liquid discharging device has a low-gloss printing mode being the printing mode of applying low glossiness and a high-gloss printing mode being the printing mode of applying high glossiness. When the temperature of the heating means in the low-gloss printing mode is Tmatte [°C] and the temperature of the heating means in the high-gloss printing mode is Tgloss [°C], the expression: Tmatte>Tgloss is satisfied.SELECTED DRAWING: None

Description

The present invention relates to a device for discharging a liquid, a method for discharging a liquid, a printing device, a printing method, and a method for controlling glossiness of a printed image.

Conventionally, in order to improve durability such as light resistance, water resistance, and abrasion resistance in industrial applications such as advertisements and signboards, and packaging materials such as foods, beverages, and daily necessities, for example, impermeable records such as plastic films have been recorded. The medium is being used. Various inks and inkjet recording devices used for such recording media have been developed.

In such an inkjet recording device, one having a gloss control function has been developed. For example, a liquid injection device including a liquid injection head capable of injecting ink containing thermoplastic resin particles from a nozzle toward a landing target and a heating means for heating ink droplets landing on the landing target has been proposed. (See, for example, Patent Document 1). In the heating means of the liquid injection device of the present proposal, the degree of film formation on the surface of the ink droplet is controlled by heating at a film formation control temperature corresponding to the minimum film formation temperature at which film formation on the surface of the ink droplet starts. doing.

Further, in an inkjet recording apparatus using a clear ink (UV clear ink) that is cured by irradiation with ultraviolet rays, it has been proposed to control the gloss to a matte or glossy tone by controlling the amount of irradiation light (for example, a patent). Reference 2).

The present invention can support both matte (low gloss) and gloss (high gloss) gloss control, and discharges a liquid that has a large difference in gloss between matte and gloss to obtain a highly decorative image. It is an object of the present invention to provide a device.

The device for ejecting the liquid of the present invention as a means for solving the above-mentioned problems includes a liquid accommodating portion for accommodating the liquid, a liquid ejection head for ejecting the liquid to the printed matter, and a heating means for heating the printed matter. A device that ejects a liquid having the above, wherein the liquid is a clear ink containing a resin, water, and a polyether-modified siloxane compound, and the apparatus that ejects the liquid is a printing mode that imparts low gloss. It has a low-gloss printing mode and a high-gloss printing mode which is a printing mode for imparting high gloss, and the temperature of the heating means in the low-gloss printing mode is set to T _matte [° C.], and the above-mentioned in the high-gloss printing mode. _Assuming that the temperature of the heating means is T gloss [° C.], the following equation, T _matte > T _gloss , is satisfied.

According to the present invention, a liquid that can support both matte (low gloss) and gloss (high gloss) gloss controls, has a large difference in gloss between matte and gloss, and can obtain a highly decorative image. A device for discharging can be provided.

FIG. 1 is a schematic view showing an example of an image forming apparatus that implements the image forming method of the present invention. FIG. 2 is a perspective explanatory view showing an example of the main tank of the image forming apparatus of FIG. FIG. 3 is a schematic view showing an example inside the main body of the inkjet printing apparatus.

(Device for discharging liquid, method for discharging liquid, printing device, and printing method)
The device for discharging a liquid of the present invention is a device for discharging a liquid having a liquid storage unit for containing the liquid, a liquid discharge head for discharging the liquid to a printed matter, and a heating means for heating the printed matter. The liquid is a clear ink containing a resin, water, and a polyether-modified siloxane compound, and the device for discharging the liquid has a low-gloss printing mode and a high-gloss printing mode that impart low gloss. It has a high-gloss printing mode, which is a printing mode to be applied, the temperature of the heating means in the low-gloss printing mode is T _matte [° C.], and the temperature of the heating means in the high-gloss printing mode is T _gloss [° C.]. Then, the following equation, T _matte > T _gloss , is satisfied, and if necessary, other means are provided.

The printing apparatus of the present invention is a printing apparatus having a liquid accommodating portion for accommodating a liquid, a liquid ejection head for ejecting the liquid to a printed matter, and a heating means for heating the printed matter.
The liquid is a clear ink containing a resin, water, and a polyether-modified siloxane compound, and the printing apparatus has a low-gloss printing mode, which is a printing mode for imparting low gloss, and a printing mode for imparting high gloss. _Assuming that the heating means has a high-gloss printing mode and the temperature of the heating means in the low-gloss printing mode is T matte [° C.] and the temperature of the heating means in the high-gloss printing mode is T _gloss [° C.], T _matte > T _gloss , and other means as needed.

The method for ejecting the liquid of the present invention is a method for ejecting a liquid including a printing step of ejecting the liquid onto a printed matter to provide a printing layer and a heating step of heating the printed printed matter. The liquid is a clear ink containing resin, water, and a polyether-modified siloxane compound, and the method of discharging the liquid is a low-gloss printing mode, which is a printing mode for imparting low gloss, and a printing mode for imparting high gloss. The temperature of the heating means in the low-gloss printing mode is T _matte [° C.], and the temperature of the heating means in the high-gloss printing mode is T _gloss [° C.]. The formula, T _matte > T _gloss , is satisfied, and if necessary, other steps are included.

The printing method of the present invention is a printing method including a printing step of ejecting a liquid onto a printed matter to provide a printing layer and a heating step of heating the printed printed matter, wherein the liquid is resin and water. , And a clear ink containing a polyether-modified siloxane compound, and the printing method has a low-gloss printing mode, which is a printing mode for imparting low gloss, and a high-gloss printing mode, which is a printing mode for imparting high gloss. _Assuming that the temperature of the heating means in the low-gloss printing mode is T matte [° C.] and the temperature of the heating means in the high-gloss printing mode is T _gloss [° C.], the following equation, T _matte > T _gloss , is established. Meet and include other steps as needed.

In the prior art described in Patent Document 1, a color ink containing a coloring material is heated at a film formation control temperature corresponding to the minimum film formation temperature at which film formation on the surface of the ink droplet starts, so that the ink droplets are formed. The glossiness is adjusted by controlling the degree of film formation on the surface. However, a color ink containing a color material has a problem that a sufficient difference in glossiness cannot be obtained as compared with a clear ink not containing a color material, and it is not possible to cope with both matte and gloss control.
Further, when the glossiness is controlled by an ink containing thermoplastic resin particles, the resin content in the ink must be increased in order to improve the leveling property on the surface of the ejected ink coating film. Is easy to thicken in a short time. Further, since the heating of the recording medium promotes the drying of the ink in the head nozzle, there is a problem that the ejection becomes unstable and the nozzle is likely to be clogged.

Further, in the prior art described in Patent Document 2, the UV clear ink has a strong odor and the odor remains in the printed matter, so that it is not suitable for the printed matter for indoor use. For this reason, the installation location of the inkjet printing device also requires an environment in which exhaust can be exhausted, and the installation location is limited. In addition, UV clear ink requires an ultraviolet irradiation device, which causes problems such as an increase in size and cost.

As a result of diligent studies, the present inventors have used a clear ink containing resin, water, and a polyether-modified siloxane compound as a liquid, and a low-gloss printing mode, which is a printing mode for imparting low gloss, and a high-gloss printing mode. By making the temperature of the printed matter different from that of the high-gloss printing mode, which is the printing mode for imparting the above, and making the temperature of the printed matter in the low-gloss printing mode higher than the temperature of the printed matter in the high-gloss printing mode. The present invention was reached with the finding that various problems can be solved. According to the present invention, it is possible to cope with both matte (low gloss) tone and gloss (high gloss) tone gloss control, and stable discharge is possible.

Further, in the prior art, even if printing is performed by changing the heating temperature of the recording medium, there is little change in the degree of wetting and spreading of the clear ink and the surface unevenness, and it is not possible to provide high-quality matte and glossy printed matter. It was enough.
As a result of diligent studies by the present inventors, the difference in wet spread to the media due to temperature change becomes large by including the polyether-modified siloxane compound in addition to the resin in the clear ink, so that the low-gloss printing mode And, when printing in the high-gloss printing mode, the surface unevenness changes greatly and the difference in glossiness becomes large. As a result, more dynamic gloss control becomes possible, and the present invention has been made with the finding that the above problems can be solved. According to the present invention, the difference in glossiness between the low-gloss printing mode and the high-gloss printing mode can be increased, so that the decorativeness can be greatly increased.

In the device for discharging the liquid and the method for discharging the liquid of the present invention, it is preferable to use an inkjet method, and according to the present invention, both low gloss (matte tone) and high gloss can be controlled and stable. It is possible to provide a printing apparatus and a printing method capable of ejecting. A printing device can be mentioned as an example of a device for discharging a liquid.
The high-gloss printing mode is a printing mode that imparts high gloss, and the surface of the printed matter becomes smooth and high-gloss. The low-gloss printing mode is a printing mode that imparts low gloss, and has a matte tone with fine irregularities on the surface of the printed matter to provide low gloss. The high-gloss print mode may also be referred to as a "gloss-gloss print mode". The low-gloss print mode is sometimes referred to as a "matte-gloss print mode".

The device for discharging the liquid and the method for discharging the liquid of the present invention use clear ink containing a resin and control the gloss of both low gloss (matte tone) and high gloss by controlling the heating temperature.
When low gloss is applied, printing is performed at a higher temperature during printing than in the high gloss mode. Due to the high temperature during printing, after the clear ink containing resin lands on the printed matter, the wet spread of the dots is suppressed, so that the coalescence of adjacent dots is suppressed and the height of the dot sphere (pile height). High dots are formed. These dots form surface irregularities and impart low gloss.

On the other hand, when high gloss is applied, printing is performed at a lower temperature than in the low gloss mode. Since the temperature at the time of printing is low, the clear ink containing the resin lands on the object to be printed, and then the dots are wetted and spread, so that the coalescence of adjacent dots is promoted and a smooth surface is formed. As a result, high gloss is imparted.
As described above, according to the present embodiment, it is possible to support both low gloss (matte tone) and high gloss control.

In the apparatus for discharging the liquid of the present invention, the temperature T (° C.) of the heating means is T _matte (° C.) in the low gloss printing mode and T matte (° C.) in the high gloss printing mode. _{When the gloss} (° C.) is set, _{it is preferable that the following equation, T matte} > T _gloss , is satisfied, T _matte > T _gloss ≥ 10 ° C. is satisfied, and T _matte > T _gloss ≥ 20 ° C. is more preferable.
The condition of T _matte > T _gloss may be satisfied at the heating temperature of the heating means during printing, and is preferably satisfied at the heating temperature of the heating means before printing.
In the present embodiment, since the wet spread of the ink coating film surface occurs at the moment of landing, it is considered that the heating after printing has little influence on the surface shape. Therefore, the heating temperature of the heating means after printing does not necessarily have to satisfy the condition of _{T matte} > T _gloss.

Further, in the present embodiment, the heating temperature of the heating means _{is preferably T matte} −T _gloss ≧ 10 [° C.]. In this case, in the low-gloss printing mode, the heating temperature is relatively higher, the wetting spread of the dots can be further suppressed, the dots having a high pile height can be formed, and a surface having large irregularities can be formed. On the other hand, in the high-gloss printing mode, the heating temperature is relatively lower, the wetting and spreading of dots can be promoted, and the coalescence of adjacent dots can form a smooth surface.
It should _{be noted that even under the condition of T matte} −T _gloss ≧ 10 [° C.], it is preferable that the heating temperature of the heating means during printing is satisfied, and the heating temperature of the heating means before printing is also satisfied. Is more preferable.

The T _matte [° C.] is preferably 50 ° C. or higher, more preferably 50 ° C. or higher and 80 ° C. or lower. The T _gloss [° C.] is preferably 70 ° C. or lower, more preferably 60 ° C. or lower. By setting such a temperature range, a large change in gloss can be realized in each printing mode using clear ink.

The landing area of the clear ink may also be referred to as a printing unit or the like. Further, the area where the clear ink does not land may be referred to as a non-printing portion or the like. Further, the portion where the clear ink has landed and, if necessary, has been heated and dried after landing is also referred to as a printing layer or the like.

In the present invention, when the print rate of the _matte print image printed in the low gloss print mode is D matte [%] and the print rate of the gloss print image printed in the high gloss print mode is D _gloss [%], D _{gloss is used.} > D _matte is preferable, and D _gloss −D _matte > 10 [%] is more preferable.
Since a smooth surface is more likely to be formed when the printing rate is high, it is preferable to obtain an image having a high printing rate in the high gloss printing mode. On the other hand, in the low-gloss printing mode, when the printing rate is high, coalescence of adjacent dots occurs and surface irregularities are less likely to be formed. Therefore, it is preferable to obtain an image having a low printing rate.

Here, the printing rate means the following.
Printing rate (%) = number of clear ink printing dots / (vertical resolution x horizontal resolution) x 100
(However, in the above formula, the "number of clear ink printing dots" is the number of dots actually printed with clear ink per unit area, and the "vertical resolution" and "horizontal resolution" are the resolutions per unit area, respectively.
When the clear inks are printed in layers so that the dot positions are the same, the "clear ink printing dot number" is represented by the total number of dots actually printed with the clear ink per unit area. )
The printing rate of 100% means the maximum weight of a single color ink with respect to a pixel.

As the print mode, for example, the low-gloss print mode and the high-gloss print mode are changed for each printed matter. The temperature setting of the heating means, the setting of the printing rate, etc. are changed depending on the printing mode.

<Liquid storage>
The liquid storage unit is also referred to as, for example, an ink storage unit, and stores ink that is a liquid.
The ink accommodating portion is not particularly limited as long as it is a member capable of accommodating ink, and examples thereof include an ink accommodating container and an ink tank.

The ink container includes the ink contained in the container, and further includes other members appropriately selected as needed.
The container is not particularly limited, and its shape, structure, size, material, etc. can be appropriately selected according to the purpose. For example, an ink bag made of an aluminum laminate film, a resin film, or the like can be used. At least those who have it can be mentioned.
Examples of the ink tank include a main tank and a sub tank.

<Liquid discharge head>
The liquid discharge head discharges a liquid onto a printed matter to form a printed layer. The liquid discharge head of the present embodiment has an individual liquid chamber communicating with a nozzle for discharging the liquid, a nozzle plate, a stimulus generating means, and the like, and the nozzle for discharging the liquid is formed in the nozzle plate. The nozzle plate preferably has a nozzle substrate and an ink-repellent film on the nozzle substrate.

The individual liquid chambers are a plurality of individual flow paths that are individually arranged corresponding to the plurality of nozzle holes provided in the nozzle plate and communicate with the nozzle holes, and are a pressurization chamber, an ink flow path, and pressurization. It may also be referred to as a liquid chamber, a pressure chamber, a discharge chamber, a liquid chamber, or the like.

The stimulus generating means is a means for generating a stimulus applied to the ink.
The stimulus in the stimulus generating means is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include heat (temperature), pressure, vibration and light. These may be used alone or in combination of two or more. Among these, heat and pressure are preferably mentioned.

Examples of the stimulus generating means include a heating device, a pressurizing device, a piezoelectric element, a vibration generator, an ultrasonic oscillator, and a light. Specifically, as the stimulus generating means, a piezoelectric actuator such as a piezoelectric element, a thermal actuator using an electric heat conversion element such as a heat generating resistor to utilize a phase change due to boiling of an ink film, and a metal phase change due to a temperature change. Examples thereof include a shape memory alloy actuator using a device, an electrostatic actuator using an electrostatic force, and the like.

When the stimulus is "heat", heat energy corresponding to the recording signal is applied to the ink in the ink ejection head by using, for example, a thermal head. Examples thereof include a method in which bubbles are generated in the ink by the heat energy and the ink is discharged as droplets from the nozzle holes of the nozzle plate by the pressure of the bubbles.
When the stimulus is "pressure", for example, the piezoelectric element bends by applying a voltage to the piezoelectric element adhered to a position called the pressure chamber in the ink flow path in the ink ejection head. .. As a result, the volume of the pressure chamber contracts, and the ink is ejected as droplets from the nozzle hole of the ink ejection head.
Among these, the piezo method in which a voltage is applied to the piezo element to fly the ink is preferable.

<Heating means>
The heating means heats the printed matter.
Examples of the heating means include means for heating and drying the printed surface and the back surface of the recording medium as the printed matter, and examples thereof include an infrared heater, a warm air heater, and a heating roller. These may be used alone or in combination of two or more.

The method for heating the recording medium as the printed matter is not particularly limited and may be appropriately selected depending on the intended purpose. For example, a method in which a heated fluid such as warm air is brought into contact with a recording medium to which ink is applied as a heating means, a method in which a recording medium to which ink is applied and a heating member are brought into contact with each other and heated by heat transfer, infrared rays or far away. Examples thereof include a method of heating a recording medium to which ink is applied by irradiating with energy rays such as infrared rays.

In the heating step, the timing of heating before, during, or after printing can be appropriately changed as long as the relationship of _{T matte} > T _{gloss is satisfied.} The liquid can be applied to the heated recording medium by heating before and during printing, and the printed matter can be dried by heating after printing.

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 depending on the intended purpose. The heating time is preferably controlled by controlling the transport speed of the recording medium as the printed matter.

The heating temperature is not particularly limited and can be appropriately changed as long as the relationship of _{T matte} > T _{gloss is satisfied.} The preferred temperature is as described above.
Further, the heating temperatures before, during, and after printing may be different from each other.

<Liquid>
The liquid used in the present invention is a clear ink containing a resin, water, and a polyether-modified siloxane compound.
The clear ink means a colorless and transparent ink that does not substantially contain a coloring material. Hereinafter, clear ink and color ink may be simply referred to as "ink".
The ink may contain an organic solvent or the like, and may contain an additive such as a defoaming agent or the like, if necessary.

<< Resin >>
The resin is not particularly limited and may be appropriately selected depending on the intended purpose. For example, polyurethane resin, polyester resin, acrylic resin, vinyl acetate resin, styrene resin, butadiene resin, styrene-butadiene resin, vinyl chloride resin, acrylic-styrene resin, acrylic-silicone resin and the like can be mentioned.

When producing ink, it is preferable to add it as resin particles made of these resins. Resin particles may be added to the ink in the form of a resin emulsion in which water is used as a dispersion medium. As the resin particles, those synthesized as appropriate may be used, or commercially available products may be used. These may be used individually by 1 type, or may be used in combination of 2 or more types of resin particles.

Among these, polyurethane resin is preferable. By adding the polyurethane resin, the coating film itself becomes tough when an ink film is formed using clear ink. As a result, it becomes easy to suppress that a part of the coating film is peeled off due to breakage inside the coating film or the surface state of the coating film is changed to change the color of the friction portion.

-Polyurethane resin-
Examples of the polyurethane resin include a polyether polyurethane resin, a polycarbonate polyurethane resin, and a polyester polyurethane resin.

The polyurethane resin is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include a polyurethane resin obtained by reacting a polyol with a polyisocyanate.

--Polyol ---
Examples of the polyol include polyether polyols, polycarbonate polyols, polyester polyols and the like. These may be used alone or in combination of two or more.

--- Polyether polyol ---
Examples of the polyether polyol include those obtained by addition polymerization of an alkylene oxide using at least one compound having two or more active hydrogen atoms as a starting material.

Examples of the compound having two or more active hydrogen atoms include ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, trimethylolglycol, 1,3-butanediol, 1,4-butanediol, and 1,6-hexane. Examples thereof include diol, glycerin, trimethylolethane, and trimethylolpropane. These may be used alone or in combination of two or more.

Examples of the alkylene oxide include ethylene oxide, propylene oxide, butylene oxide, styrene oxide, epichlorohydrin, and tetrahydrofuran. These may be used alone or in combination of two or more.

The polyether polyol is not particularly limited and may be appropriately selected depending on the intended purpose. However, from the viewpoint of obtaining an ink binder capable of imparting extremely excellent scratch resistance, polyoxytetramethylene glycol and polyoxy Propylene glycol is preferred. These may be used alone or in combination of two or more.

--- Polycarbonate Polyol ---
Examples of the polycarbonate polyol that can be used in the production of the polyurethane resin include those obtained by reacting a carbonic acid ester with a polyol, and those obtained by reacting phosgene with bisphenol A and the like. These may be used alone or in combination of two or more.

Examples of the carbonic acid ester include methyl carbonate, dimethyl carbonate, ethyl carbonate, diethyl carbonate, cyclocarbonate, diphenyl carbonate and the like. These may be used alone or in combination of two or more.

Examples of the polyol include ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, dipropylene glycol, 1,4-butanediol, 1,3-butanediol, 1, 2-butanediol, 2,3-butanediol, 1,5-pentanediol, 1,5-hexanediol, 2,5-hexanediol, 1,6-hexanediol, 1,7-heptanediol, 1,8 − Octanediol, 1,9-nonanediol, 1,10-decanediol, 1,11-undecanediol, 1,12-dodecanediol, 1,4-cyclohexanediol, 1,4-cyclohexanedimethanol, hydroquinone, resorcin , Bisphenol-A, Bisphenol-F, 4,4'-biphenol and other relatively low molecular weight dihydroxy compounds; Polyether polyols such as polyethylene glycol, polypropylene glycol and polyoxytetramethylene glycol; Polyhexamethylene adipate, polyhexamethylene Examples thereof include polyester polyols such as succinate and polycaprolactone. These may be used alone or in combination of two or more.

--- Polyester polyol ---
Examples of the polyester polyol include those obtained by esterifying a low molecular weight polyol and a polycarboxylic acid, polyester obtained by ring-opening polymerization reaction of a cyclic ester compound such as ε-caprolactone, and copolymerization thereof. Examples include polyester. These may be used alone or in combination of two or more.

Examples of the low molecular weight polyol include ethylene glycol and propylene glycol. These may be used alone or in combination of two or more.

Examples of the polycarboxylic acid include succinic acid, adipic acid, sebacic acid, dodecandicarboxylic acid, terephthalic acid, isophthalic acid, phthalic acid, anhydrides or ester-forming derivatives thereof. These may be used alone or in combination of two or more.

--Polyisocyanate ---
Examples of the polyisocyanate include aromatic diisocyanates such as phenylenediocyanate, tolylene diisocyanate, diphenylmethane diisocyanate, and naphthalene diisocyanate; hexamethylene diisocyanate, lysine diisocyanate, cyclohexane diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, xylylene diisocyanate, and tetramethylxyli. Examples thereof include aliphatic or alicyclic diisocyanates such as range isocyanate and 2,2,4-trimethylhexamethylene diisocyanate. These may be used alone or in combination of two or more. Among these, alicyclic diisocyanate is preferable from the viewpoint of weather resistance.

Further, by using at least one kind of alicyclic diisocyanate, it becomes easy to obtain the desired coating film strength and scratch resistance.
Examples of the alicyclic diisocyanate include isophorone diisocyanate and dicyclohexylmethane diisocyanate.
The content of the alicyclic diisocyanate is preferably 60% by mass or more with respect to the total amount of the isocyanate compound.

--Manufacturing method of polyurethane resin ---
The polyurethane resin is not particularly limited and can be obtained by a conventionally commonly used production method, and examples thereof include the following methods.
First, an isocyanate-terminated urethane prepolymer is produced by reacting the polyol with the polyisocyanate at an equivalent ratio in which the isocyanate group becomes excessive in the absence of a solvent or in the presence of an organic solvent.
Then, the anionic group in the isocyanate-terminated urethane prepolymer is neutralized with a neutralizing agent if necessary, and then reacted with a chain extender, and finally the organic solvent in the system is removed if necessary. Can be obtained by

Examples of the organic solvent that can be used for producing the polyurethane resin include ketones such as acetone and methyl ethyl ketone; ethers such as tetrahydrofuran and dioxane; acetate esters such as ethyl acetate and butyl acetate; nitriles such as acetonitrile; dimethylformamide. , N-Methylpyrrolidone, N-ethylpyrrolidone and other amides. These may be used alone or in combination of two or more.
Examples of the chain extender include polyamines and other active hydrogen group-containing compounds.

Examples of the polyamine include ethylenediamine, 1,2-propanediamine, 1,6-hexamethylenediamine, piperazine, 2,5-dimethylpiperazin, isophoronediamine, 4,4'-dicyclohexylmethanediamine, and 1,4-cyclohexane. Diamines such as diamines; Polyamines such as diethylenetriamine, dipropylenetriamine, and triethylenetetramine; Hydradins such as hydrazine, N, N'-dimethylhydrazine, and 1,6-hexamethylenebishydrazine; dihydrazide succinate, dihydrazide adipic acid , Glutarate dihydrazide, sebacic acid dihydrazide, isophthalic acid dihydrazide and other dihydrazides. These may be used alone or in combination of two or more.

Examples of the other active hydrogen group-containing compound include ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, and hexamethylene glycol. Glycos such as saccharose, methylene glycol, glycerin, sorbitol; phenols such as bisphenol A, 4,4'-dihydroxydiphenyl, 4,4'-dihydroxydiphenyl ether, 4,4'-dihydroxydiphenylsulfone, hydrogenated bisphenol A, hydroquinone, etc. Kind: Water and the like. These may be used alone or in combination of two or more as long as the storage stability of the ink is not deteriorated.

As the polyurethane resin, a polycarbonate-based polyurethane resin is preferable from the viewpoints of water resistance, heat resistance, abrasion resistance, weather resistance, and scratch resistance of images due to the high cohesive force of carbonate groups. In the case of the polycarbonate-based polyurethane resin, an ink suitable for a recorded material used in a harsh environment such as outdoor use can be obtained.

As the polyurethane resin, a commercially available product may be used, for example, U-coat UX-485 (polyurethane-based polyurethane resin), U-coat UWS-145 (polyurethane-based polyurethane resin), Permarin UA-368T (polyurethane-based polyurethane resin), and the like. Permarin UA-200 (polyether-based polyurethane resin) (all manufactured by Sanyo Kasei Kogyo Co., Ltd.) and the like can be mentioned. These may be used alone or in combination of two or more.

-Resin content-
The content of the resin contained in the clear ink is preferably 8% by mass or more, more preferably 8% by mass or more and 25% by mass or less. When the resin content is 8% by mass or more, low gloss and high gloss can be controlled with a small amount of clear ink. On the other hand, when the content of the resin is 25% by mass or less, it is possible to further suppress the deterioration of the ejection stability of the ink.

Low gloss is realized by forming isolated dots with a high height of the dot sphere (pile height) and imparting irregularities on the surface. When the content of the resin in the clear ink is large, dots having a high pile height are likely to be formed, which is preferable from the viewpoint of easily imparting low gloss.
On the other hand, high gloss imparts smoothness by filling the unevenness of the surface with clear ink to form a smooth surface. In order to fill the unevenness of the surface with clear ink, it is preferable that the content of the resin in the clear ink is large because the unevenness of the surface can be filled with a small amount of clear ink and high gloss can be easily imparted.

In inks on the market in general, the components of the resin contained are often unknown, but for example, the structure is constructed by using a thermal decomposition-gas chromatograph mass spectrometry (Py-GCMS) method, an FT-IR method, an NMR method, or the like. Can be analyzed. The conditions for resin analysis of ink by the Py-GCMS method are described below. In this method, a small amount of sample is directly exposed to high temperature conditions to cause instantaneous thermal decomposition, the gas component generated at that time is guided to a GC / MS device, and the spectrum is analyzed from the structure estimation by library search. Is. The analysis conditions are described below as an example, but the conditions are not limited to the following. The analysis conditions can be changed at any time according to the composition and state of the analysis product, and the analysis can be performed while examining the optimum conditions.

-Device configuration / measurement conditions-
-GC / MS equipment: QP-5000 manufactured by Shimadzu Corporation
-Pyrolysis device: Py-3030D manufactured by Frontier Lab
-Evaluation conditions-
・ Heating temperature: 200 ℃
-Column: UA5L = 30 mL. D = 0.25mm Film = 0.25μm
-Column temperature rise: 50 ° C to 350 ° C (20 ° C / min temperature rise)
-Ionization method: EI method (70eV)
-Injection mode: Split (1: 100)

<< Water >>
The water is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include ion-exchanged water, ultrafiltration water, reverse osmosis water, pure water such as distilled water, and ultrapure water. .. These may be used alone or in combination of two or more.
The content of the water is not particularly limited, but when used as a water-based clear ink, it is preferably 0.1% by mass or more and 80% by mass or less, and 15% by mass or more and 60% by mass or less with respect to the total amount of ink. Is more preferable. Within the above range, the ejection stability can be improved and the image quality can be improved. Further, when it is 15% by mass or more, it is prevented that the viscosity becomes high, and the discharge stability is further improved. On the other hand, when it is 60% by mass or less, the wettability to the impermeable recording medium becomes preferable, and the image quality is further improved.

<< Organic Solvent >>
The ink may contain an organic solvent. The organic solvent is not particularly limited and may be appropriately selected depending on the intended purpose, and examples thereof include a water-soluble organic solvent. The term "water-soluble" means that, for example, 5 g or more is dissolved in 100 g of water at 25 ° C.

Examples of the water-soluble organic solvent include ethylene glycol, diethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 2,3-butanediol, and 3 -Methyl-1,3-butanediol, 3-methoxy-3-methylbutanol, triethylene glycol, polyethylene glycol, polypropylene glycol, 1,5-pentanediol, 2-methyl-2,4-pentanediol, 1,6 -Hexanediol, glycerin, 1,2,6-hexanetriol, 2-ethyl-1,3-hexanediol, ethyl 1,2,4-butanetriol, 1,2,3-butanetriol, petriol, etc. Valuable alcohols: Polyvalent alcohols 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, propylene glycol monoethyl ether, and dipropylene glycol monomethyl ether. Alkyl ethers; Polyhydric alcohol aryl ethers such as ethylene glycol monophenyl ether and ethylene glycol monobenzyl ether; 2-pyrrolidone, N-methyl-2-pyrrolidone, N-hydroxyethyl-2-pyrrolidone, 1,3-dimethyl Nitrogen-containing heterocyclic compounds such as imidazolidinone, ε-caprolactam and γ-butyrolactone; amides such as formamide, N-methylformamide, N, N-dimethylformamide; amines such as monoethanolamine, diethanolamine and triethylamine; dimethyl Sulfur-containing compounds such as sulfoxide, sulfolane and thiodiethanol; propylene carbonate, ethylene carbonate and the like can be mentioned. These may be used alone or in combination of two or more.

The content of the organic solvent in the ink is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 10% by mass or more and 60% by mass or less from the viewpoint of ink drying property and ejection reliability. More preferably, it is 20% by mass or more and 60% by mass or less.

-Surfactant-
The clear ink preferably contains a surfactant.
By adding a surfactant to the ink, the surface tension is reduced and the ink droplets permeate into the recording medium after landing on the recording medium such as paper, so that feathering and color bleeding can be reduced. Can be done.

In the present invention, a polyether-modified siloxane compound is used as one of the surfactants.
By using the polyether-modified siloxane compound as one of the surfactants, the difference in wettability and spread on the media due to the temperature change becomes large. Therefore, when printing in the low-gloss printing mode and the high-gloss printing mode, respectively, The surface unevenness changes greatly, and the difference in glossiness becomes large. As a result, more dynamic gloss control becomes possible, and the decorativeness can be greatly increased.

The polyether-modified siloxane compound is preferably at least one selected from the compounds represented by the following general formula (I).

ただし、前記一般式（Ｉ）中、ｍは、０〜２３の整数を示し、ｎは、１〜１０の整数を示す。ａは、１〜２３の整数を示し、ｂは、０〜２３の整数を示す。Ｒは、水素原子又は炭素数１〜４のアルキル基を表す。

However, in the general formula (I), m represents an integer of 0 to 23, and n represents an integer of 1 to 10. a represents an integer of 1 to 23, and b represents an integer of 0 to 23. R represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.

ただし、前記一般式（ＩＩ）中、ｏは０〜４の整数、ｑは０〜３の整数、ｑ＋ｏは０〜７の整数、ｐは１〜２の整数、ｒは２〜１６の整数を示す。 Further, it is preferable that the compound represented by the general formula (I) is a compound represented by the following general formula (II).

However, in the general formula (II), o is an integer of 0 to 4, q is an integer of 0 to 3, q + o is an integer of 0 to 7, p is an integer of 1 to 2, and r is an integer of 2 to 16. Shown.

As the polyether-modified siloxane compound, a compound synthesized as appropriate may be used, or a commercially available product may be used.
The method for synthesizing the polyether-modified siloxane compound is not particularly limited and may be appropriately selected depending on the intended purpose. For example, Patent No. 5101598, Japanese Patent No. 5032325, Japanese Patent No. 5661229 and the like are described. For example, (A) polyether and (B) organohydrogensiloxane can be synthesized by hydrosilylation reaction.

Polyethers of the component _{(A), - (C n H 2n O} ) - ( wherein, n is 2-4.) Shows a polyoxyalkylene polymer represented by.
The polyoxyalkylene copolymer unit is preferably an oxyethylene unit- (C ₂ H ₄ O)-, an oxypropylene unit- (C ₃ H ₆ O)-, an oxybutylene unit- (C ₄ H ₈ O)-,. Or they can include mixed units. The oxyalkylene units may be arranged in any way and can form either a block or a random copolymer structure, but preferably form a random copolymer group. More preferably, the polyoxyalkylene _{contains both oxyethylene units (C 2} H ₄ O) and oxypropylene units (C ₃ H ₆ O) in the random copolymer.

The organohydrogensiloxane of the component (B) is an organopolysiloxane containing at least one hydrogen (SiH) bonded to silicon per molecule. Examples of the organopolysiloxane include (R ₃ SiO _0.5 ), (R ₂ SiO), (RSiO _1.5 ), (SiO ₂ ) (however, in the formula, R is an organic group or a hydrocarbon independently. Any number or combination of hydrocarbon units (which are hydrocarbon groups) can be mentioned.
When R of (R ₃ SiO _0.5 ), (R ₂ SiO), and (RSiO _1.5 ) of the organopolysiloxane is a methyl group, the syroxy units are M, D, and T units, respectively. On the other hand, the (SiO ₂ ) syroxy unit is shown as the Q unit.
The organohydrogensiloxane has a similar structure but has at least one SiH present on the siroxy unit.
The methyl syloxy unit in the organohydrogensiloxane includes "MH" syroxy unit (R ₂ HSiO _0.5 ), "DH" syroxy unit (RHSiO), and "TH" syroxy unit (HSiO _1.5 ). Can be expressed as.
The organohydrogensiloxane can contain any number of M, MH, D, DH, T, TH, or Q siloxy units, provided that at least one siloxy unit comprises SiH.

The component (A) and the component (B) are reacted by a hydrosilylation reaction. The hydrosilylation reaction is not particularly limited and may be appropriately selected depending on the intended purpose, but it is preferably carried out by adding a hydrosilylation catalyst.
The hydrosilylation catalyst is not particularly limited and may be appropriately selected depending on the intended purpose. For example, platinum, rhodium, ruthenium, palladium, osmium, or iridium metal, or an organometallic compound thereof, or a combination thereof. And so on.
The content of the hydrosilylation catalyst is preferably 0.1 ppm to 1,000 ppm, more preferably 1 ppm to 100 ppm, based on the weights of the component (A) and the component (B).

The hydrosilylation reaction can be carried out without dilution or in the presence of a solvent, but is preferably carried out in the presence of a solvent.

Examples of the solvent include alcohols (eg, methanol, ethanol, isopropanol, butanol, or n-propanol), ketones (eg, acetone, methyl ethyl ketone, or methyl isobutyl ketone); aromatic hydrocarbons (eg, benzene, toluene, etc.). Or xylene); aliphatic hydrocarbons (eg, heptane, hexane, or octane); glycol ethers (eg, propylene glycol methyl ether, dipropylene glycol methyl ether, propylene glycol n-butyl ether, propylene glycol n-propyl ether, or ethylene. Glycol n-butyl ether), halogenated hydrocarbons (eg, dichloromethane, 1,1,1-trichloroethane, or methylene chloride, chloroform), dimethylsulfoxide, dimethylformamide, acetonitrile, tetrahydrofuran, volatile oils, mineral spirits, or naphtha. Can be mentioned. These may be used alone or in combination of two or more.

The amounts of the component (A) and the component (B) used in the hydrosilylation reaction are not particularly limited and can be appropriately adjusted according to the intended purpose, and the total unsaturated groups in the component (A) can be used. , Represented by the molar ratio of the component (B) to the SiH content. It is preferable to use an amount of 20 mol% or less of a polyether unsaturated group with respect to the amount of SiH of the organohydrogensiloxane, and more preferably to use an amount of 10 mol% or less of an unsaturated group of polyether. preferable.
The hydrosilylation reaction is not particularly limited and can be carried out by any known batch method, semi-continuous method or continuous method, for example, a continuous method using a plug flow reactor.

Examples of commercially available products of the polyether-modified siloxane compound include 71ADDITIVE, 74ADDITIVE, 57ADDITIVE, 8029ADDITIVE, 8054ADDITIVE, 8211ADDITIVE, 8019ADDITIVE, 8526ADDITIVE, FZ-2123, and FZ-2191 (all manufactured by TORAY Dow Corning Co., Ltd.). , TSF4441, TSF4445, TSF4446, TSF4450, TSF4452, TSF4460 (all manufactured by Momentive Performance Materials); Silface SAG002, Silface SAG003, Silface SAG005, Silface SAG503A, Silface SAG008, Silface SJM003 (Made by Nisshin Kagaku Kogyo Co., Ltd.); TEGO Wet KL245, TEGO Wet 250, TEGO Wet 260, TEGO Wet 265, TEGO Wet 270, TEGO Wet 280 (all made by Evonik); BYK-345, BYK-347, BYK Examples thereof include -348, BYK-375, and BYK-377 (all manufactured by Big Chemie Japan). These may be used alone or in combination of two or more.
Among these, TEGO Wet 270 (manufactured by Evonik Industries) and Silface SAG503A (manufactured by Nisshin Chemical Industry Co., Ltd.) are preferable.

As the surfactant, in addition to the polyether-modified siloxane compound, a fluorine-based surfactant, a silicone-based surfactant, an acetylene glycol, an acetylene alcohol-based surfactant, or the like may be used in combination.

The content of the surfactant is preferably 2% by mass or less, more preferably 0.05% by mass or more and 2% by mass or less, and further preferably 0.1% by mass or more and 2% by mass or less with respect to the total amount of the ink. By setting the content of the surfactant to 2% by mass or less, a large decrease in glossiness can be obtained in the low gloss printing mode.

-Defoamer-
The defoaming agent is not particularly limited, and examples thereof include a silicone-based defoaming agent, a polyether-based defoaming agent, and a fatty acid ester-based defoaming agent. These may be used alone or in combination of two or more. Among these, a silicone-based defoaming agent is preferable because it has an excellent defoaming effect.

-Preservatives and fungicides-
The antiseptic and antifungal agent is not particularly limited, and examples thereof include 1,2-benzisothiazolin-3-one.

-Rust inhibitor-
The rust preventive is not particularly limited, and examples thereof include acidic sulfites and sodium thiosulfate.

-PH regulator-
The pH adjusting agent is not particularly limited as long as the pH can be adjusted to 7 or more, and examples thereof include amines such as diethanolamine and triethanolamine.

-Physical characteristics-
The physical characteristics of the ink are not particularly limited and may be appropriately selected depending on the intended purpose. For example, the viscosity, static surface tension, pH and the like are preferably in the following ranges.
The viscosity of the ink at 25 ° C. is preferably 5 mPa · s or more and 30 mPa · s or less, preferably 5 mPa · s or more and 25 mPa · s or less, from the viewpoint of improving the print density and character quality and obtaining good ejection properties. More preferred. Here, for the viscosity, for example, a rotary viscometer (manufactured by Toki Sangyo Co., Ltd., RE-80L) can be used. As the measurement conditions, it is possible to measure at 25 ° C. with a standard cone rotor (1 ° 34'x R24), a sample liquid volume of 1.2 mL, a rotation speed of 50 rpm, and 3 minutes.
The static surface tension of the ink is preferably 35 mN / m or less, more preferably 32 mN / m or less at 25 ° C. from the viewpoint that the ink is preferably leveled on the recording medium and the drying time of the ink is shortened.
Assuming that the static surface tension of the clear ink is SCL and the static surface tension of the color ink is SC, the difference between the SCL and the SC is an absolute value of 3 mN / m or less. It is preferable from the viewpoint of suppressing the occurrence. The difference between the SCL and the SC is more preferably 1 mN / m or less in absolute value.
The pH of the ink is preferably 7 to 12, more preferably 8 to 11, from the viewpoint of preventing corrosion of the metal member in contact with the liquid.

<Printed matter>
The printed matter is not limited to that used as a recording medium, and for example, wallpaper, flooring materials, building materials such as tiles, clothing cloth such as T-shirts, textiles, leather and the like can be appropriately used. By adjusting the configuration of the path for transporting the recording medium, ceramics, glass, metal, or the like can be used as the printed matter.

The recording medium is not particularly limited, and plain paper, glossy paper, special paper, cloth, or the like can be used, but good image formation can be achieved even if a non-permeable base material is used.
The non-permeable base material is a base material having a surface having low water permeability and low absorbability, and includes a material that does not open to the outside even if there are many cavities inside, and more quantitatively. , A base material having a water absorption amount of 10 mL / m ² or less from the start of contact to 30 msec ^{1/2 in the Bristow method.}
As the non-permeable substrate, for example, a plastic film such as a vinyl chloride resin film, a polyethylene terephthalate (PET) film, an acrylic resin film, a polypropylene film, a polyethylene film, or a polycarbonate film can be preferably used.

In the present invention, in the low-gloss printing mode, it is preferable to use a printed matter having a high glossiness. A printed matter having a high glossiness is preferable because the low gloss effect of the clear ink is easily emphasized.
On the other hand, in the high-gloss printing mode, it is preferable to use a printed matter having a low glossiness. A printed matter having a low glossiness is preferable because the high gloss effect of the clear ink is easily emphasized.

Therefore, the glossiness of the substrate used in the low gloss printing mode and _{G matte,} the gloss of the substrate and _{G gloss} used in high gloss printing _mode, is preferably _{G matte> G gloss, G matte} -G It is more preferable that _{gloss ≧ 100.}

In addition, G _matte > G _gloss is obtained by measuring, for example, a 60 ° gloss value. The 60 ° gloss value is measured using, for example, a glossiness measuring device (Microtrigloss, manufactured by BYK).

(Gloss control method for printed images)
The method for controlling the glossiness of a printed image of the present invention is a method for controlling the glossiness of a printed image, which includes a printing step of ejecting a liquid onto a printed matter to provide a printing layer and a heating step of heating the printed matter to be printed. The liquid is a clear ink containing a resin, water, and a polyether-modified siloxane compound, and the gloss control method for the printed image is a low-gloss printing mode and a high-gloss printing mode for imparting low gloss. It has a high-gloss printing mode, which is a printing mode to be applied, and controls to raise the heating temperature when printing in the low-gloss printing mode, and sets the heating temperature when printing in the high-gloss printing mode. Control to lower.

<Printed matter>
The printed matter obtained by the present invention is a printed matter having a printed matter and a printed matter on the printed matter, and the printed matter is composed of a clear ink layer containing a resin. According to the present invention, a printed matter whose gloss is controlled in both matte and glossy conditions can be obtained.

<Recording device, recording method>
In the following description of the recording device and the recording method, the case where black (K) ink, cyan (C) ink, magenta (M) ink, and yellow (Y) ink are used will be described, but instead of these, or In addition to these, water-based clear ink may be used.
The clear ink used in the present invention can be suitably used for various recording devices by an inkjet recording method, for example, a printer, a facsimile device, a copying device, a printer / fax / copier multifunction device, a three-dimensional modeling device, and the like.
Unless otherwise specified, the inkjet printing apparatus includes both a serial type apparatus that moves the ejection head and a line type apparatus that does not move the ejection head.
Further, the inkjet printing device includes not only a desktop type but also a wide recording device and a continuous book printer capable of using, for example, continuous paper wound in a roll shape as a recording medium.
In the present invention, the recording device and the recording method are devices capable of ejecting ink and various processing liquids to a recording medium, and a method of recording using the device. The recording medium means a medium to which ink and various treatment liquids can adhere even temporarily.
This recording device can include not only a head portion for ejecting ink, but also means related to feeding, transporting, and discharging paper of a recording medium, and other devices called pretreatment devices and posttreatment devices. ..
Further, the recording device and the recording method are not limited to those in which significant images such as characters and figures are visualized by ink. For example, those that form patterns such as geometric patterns and those that form a three-dimensional image are also included.
Further, the recording device includes both a serial type device that moves the discharge head and a line type device that does not move the discharge head, unless otherwise specified.
Further, for this recording device, it is possible to use not only a desktop type but also a wide recording device capable of printing on an A0 size recording medium, for example, continuous paper wound in a roll shape as a recording medium. A continuous line printer is also included.

An example of the recording device will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective explanatory view of the recording device. FIG. 2 is a perspective explanatory view of the main tank. The image forming apparatus 400 as an example of the recording apparatus is a serial type image forming apparatus. A mechanical unit 420 is provided in the exterior 401 of the image forming apparatus 400. Each ink container 411 of the main tank 410 (410k, 410c, 410m, 410y) for each color of black (K), cyan (C), magenta (M), and yellow (Y) is, for example, an aluminum laminate film or the like. It is made of packaging members. The ink container 411 is housed in, for example, a plastic container case 414. As a result, the main tank 410 is used as an ink cartridge for each color.
On the other hand, a cartridge holder 404 is provided behind the opening when the cover 401c of the apparatus main body is opened. A main tank 410 is detachably attached to the cartridge holder 404. As a result, each ink ejection port 413 of the main tank 410 and the ejection head 434 for each color communicate with each other via the supply tube 436 for each color, and ink can be ejected from the ejection head 434 to the recording medium.

This recording device can include not only a portion that ejects ink, but also a device called a pretreatment device, a posttreatment device, and the like.
As one aspect of the pretreatment device and the posttreatment device, as in the case of inks such as black (K), cyan (C), magenta (M), and yellow (Y), a liquid having a pretreatment liquid and a posttreatment liquid. There is an embodiment in which a storage unit and a liquid discharge head are added, and the pretreatment liquid and the posttreatment liquid are discharged by an inkjet recording method.
As another aspect of the pretreatment device and the posttreatment device, there is a mode in which a pretreatment device and a posttreatment device by, for example, a blade coating method, a roll coating method, and a spray coating method are provided other than the inkjet recording method.

Here, FIG. 3 shows the inside of the main body of the inkjet printing apparatus, and the recording head 2, the platen 3, the roll media accommodating portion 4, the heating means, and the like are arranged.
The carriage 15 is a recording head 2 which is a discharge means for ejecting ink droplets by mounting clear ink and, if necessary, black (K), yellow (Y), magenta (M), and cyan (C) inks. Is installed.
Further, the roll media accommodating unit 4 is a paper feeding means, and a roll media (recording media) 30 which is a printed matter is set.
The transport means 60 is composed of a feed roller 34 and a presser roller 35 provided so as to face each other below and above the platen 3 with the platen 3 interposed therebetween.
Then, the printed matter (recording medium) 29 is sandwiched between the feed roller 34 and the presser roller 35, and the feed roller 34 is rotated forward (in the direction of the arrow in FIG. 3) to carry it onto the platen 3. The structure is such that the recorded recording media 29 can be conveyed forward on the platen 3.

Further, the preheater 40 (heating before printing) for preliminarily heating the recording media 29 upstream in the recording media transport direction of the platen 3 and heating for adhering the clear ink to the printed matter from the nozzle of the recording head are performed. (Heating during printing) A print heater 41 is provided as a heating means.
Further, on the downstream side of the recording head 2, a post heater 42 may be provided on the downstream side of the platen 3 (heating after printing). It is preferable to provide the post heater 42 because the recording medium 29 can be continuously heated and the landed ink droplets can be dried.
For the preheater 40, the print heater 41, and the post heater 42, for example, a conductive heating heater using ceramic or nichrome wire is used. Other heating means such as hot air heating may be used.

Further, further heating means may be provided on the downstream side after the start point of the post heater 42, such as a warm air fan 43 that blows warm air onto the recording surface on which the ink of the recording media 29 has landed.
The recording media 29 can be wound up by the take-up roll 39 after being completely dried by directly applying warm air to the ink on the recording surface by the warm air fan.

The method of using the ink is not limited to the inkjet recording method, and can be widely used. In addition to the inkjet recording method, examples thereof include a blade coating method, a gravure coating method, a bar coating method, a roll coating method, a dip coating method, a curtain coating method, a slide coating method, a die coating method, and a spray coating method.

The use of the ink is not particularly limited and can be appropriately selected depending on the purpose, and can be applied to, for example, printed matter, paint, coating material, base material and the like. Further, it can be used not only as an ink to form two-dimensional characters and images, but also as a three-dimensional modeling material for forming a three-dimensional three-dimensional image (three-dimensional model).
As the three-dimensional modeling apparatus for modeling the three-dimensional object, a known one can be used, and the device is not particularly limited, but for example, one provided with ink accommodating means, supply means, ejection means, drying means and the like is used. be able to. The three-dimensional model includes a three-dimensional model obtained by overcoating with ink. In addition, a molded product obtained by processing a structure in which ink is applied on a base material such as a recording medium is also included. The molded product is, for example, a sheet-like or film-shaped recorded material or structure that has been subjected to molding processing such as heat stretching or punching, and is, for example, an automobile, OA equipment, or electricity. -Suitably used for molding after decorating the surface of electronic devices, meters for cameras, panels of operation parts, etc.

In addition, image formation, recording, printing, printing, etc. in the terms of the present invention are all synonymous.
Recording media, media, and printed matter are all synonymous.

Hereinafter, examples of the present invention will be described, but the present invention is not limited to these examples. Unless otherwise specified, the preparation, preparation, evaluation, etc. in the examples were carried out under the conditions of room temperature of 25 ° C. and humidity of 60% RH.

(Preparation Example 1)
<Preparation of polyurethane resin emulsion 1>
Polycarbonate diol (reaction product of 1,6-hexanediol and dimethyl carbonate (number average molecular weight (Mn): 1,200)) 1,500 mass in a reaction vessel containing a stirrer, a reflux cooling tube, and a thermometer. 220 parts by mass of 2,2-dimethylolpropionic acid (hereinafter, also referred to as "DMPA"), and 1,347 parts by mass of N-methylpyrrolidone (hereinafter, also referred to as "NMP") are nitrogen. It was charged under an air stream and heated to 60 ° C. to dissolve DMPA.
Next, 1,445 parts by mass of 4,4'-dicyclohexylmethane diisocyanate and 2.6 parts by mass of dibutyltin dilaurylate (catalyst) were added and heated to 90 ° C., and a urethanization reaction was carried out over 5 hours to carry out a urethanization reaction at the isocyanate terminal. Urethane prepolymer was obtained. The reaction mixture was cooled to 80 ° C., 149 parts by mass of triethylamine was added thereto, 4,340 parts by mass was extracted from the mixture, and 5,400 parts by mass of water and 15 parts by mass of triethylamine were extracted under strong stirring. Was added to the mixed solution of.
Next, 1,500 parts by mass of ice was added, and 626 parts by mass of a 35% by mass 2-methyl-1,5-pentanediamine aqueous solution was added to carry out a chain extension reaction so that the solid content concentration became 30% by mass. The solvent was distilled off from the mixture to obtain a polycarbonate-based polyurethane resin emulsion 1 (solid content concentration: 30% by mass).
When the obtained polycarbonate-based polyurethane resin emulsion 1 was measured with a film-forming temperature tester (manufactured by Imoto Seisakusho Co., Ltd.), the minimum film-forming temperature was 55 ° C.

(Preparation Example 2)
<Preparation of acrylic resin emulsion 1>
900 parts by mass of ion-exchanged water and 1 part by mass of sodium lauryl sulfate were placed in a reaction vessel equipped with a stirrer, a reflux condenser, a dropping device, and a thermometer, and the temperature was raised to 70 ° C. while substituting nitrogen under stirring. Keep the internal temperature at 70 ° C., add 4 parts by mass of potassium persulfate as a polymerization initiator, and after dissolution, 450 parts by mass of ion-exchanged water, 3 parts by mass of sodium lauryl sulfate, 20 parts by mass of acrylamide, 365 parts by mass of styrene, The emulsion prepared by adding 545 parts by mass of butyl acrylate and 10 parts by mass of methacrylic acid under stirring was continuously added dropwise into the reaction solution over 4 hours. After completion of the dropping, the mixture was held for 3 hours.
After cooling the obtained aqueous emulsion to room temperature, ion-exchanged water and an aqueous sodium hydroxide solution were added to adjust the pH to 8, to obtain an acrylic resin emulsion 1 (solid content concentration: 30% by mass).

(Production example 1 of clear ink)
-Manufacturing of clear ink A-
Polyurethane resin emulsion 1 of Preparation Example 1 (solid content concentration: 30% by mass) 25% by mass, 1,2-propanediol 20% by mass, 1,3-propanediol 11% by mass, 1,2-butanediol 2% by mass , 2% by mass of trade name "TEGO Wet270" (manufactured by Ebonic, compound represented by the general formula (II)) and 40% by mass of high pure water were added as a surfactant, and the mixture was mixed and stirred to prepare a mixture.
Next, the obtained mixture was filtered through a polypropylene filter having an average pore size of 0.2 μm (trade name: Betafine polypropylene pleated filter PPG series, manufactured by 3M) to prepare clear ink A.

(Production Examples 2 to 7 of Clear Ink)
-Manufacturing of clear inks B to G-
Clear inks B to G were produced in the same manner as in Production Example 1 of clear ink except that the ink compositions shown in Table 1-1 and Table 1-2 were changed in Production Example 1 of clear ink.

＊ＴＥＧＯ Ｗｅｔ２７０（エボニック社製）は、上記一般式（ＩＩ）で表される界面活性剤であり、ｑ＝０、ｏ＝０〜７、ｐ＝１、ｒ＝２〜１５である。
＊シルフェイスＳＡＧ５０３Ａ（日信化学工業株式会社製）及びＢＹＫ−３４９（ビックケミー・ジャパン社製）は、上記一般式（Ｉ）で表される化合物である。

* TEGO Wet270 (manufactured by Evonik Industries, Inc.) is a surfactant represented by the above general formula (II), and has q = 0, o = 0 to 7, p = 1, r = 2 to 15.
* Silface SAG503A (manufactured by Nisshin Chemical Industry Co., Ltd.) and BYK-349 (manufactured by Big Chemie Japan Co., Ltd.) are compounds represented by the above general formula (I).

(Example 1)
<Inkjet printing>
The ink cartridge of an inkjet recording device (IPSiO GXe-5500 modified machine manufactured by Ricoh Co., Ltd.) is filled with clear ink A, and the ink cartridge filled with these inks is mounted on the above-mentioned inkjet recording device, and the temperature is 25 ° C. Printing was performed in an environment adjusted to ± 0.5 ° C. and 50 ± 5% RH. Further, the modified machine is provided with a heater (temperature control controller, model: MTCD, manufactured by MISUMI Co., Ltd.) so that the recording medium can be heated from the back surface before, during, and after printing. As a result, it is possible to print on the recording medium heated by the heater before and during printing, and after printing, the printed matter can be heated and dried by the heater.
Printing was performed by changing the type of recording medium, heating conditions, and printed image in the high-gloss printing mode and the low-gloss printing mode.

-Type of recording medium-
In the high-gloss printing mode, synthetic paper VJFN160 (white polypropylene film, glossiness 16 (60 ° gloss value)) manufactured by YUPO Co., Ltd. was used as the recording medium 1.
In the low-gloss printing mode, a window film GIY0305 (transparent polyethylene terephthalate (PET) film, glossiness 159 (60 ° gloss value)) manufactured by Lintec Sign System Co., Ltd. was used as the recording medium 2.

-Heating conditions-
The heating conditions were set to 60 ° C., 60 ° C., and 70 ° C. for _{the heating temperature (= T gloss} (° C.)) of each heater (heating means) arranged before, during, and after printing in the high-gloss printing mode. .. In the low-gloss printing mode, the heating temperature (= T _matte (° C.)) of each heater (heating means) was set to 65 ° C., 65 ° C., and 70 ° C. When the temperature of the recording medium during printing is measured, the temperature of the recording medium in the high-gloss printing mode is 59 ° C., and the temperature of the heating means in the high-gloss printing mode during printing is 60 ° C. Further, when the temperature of the recording medium during printing is measured, the temperature of the recording medium in the low-gloss printing mode is 64 ° C, and the temperature of the heating means in the low-gloss printing mode during printing is 65 ° C.
The temperature of the recording medium during printing was measured by a digital radiation temperature sensor FT-H10 (manufactured by KEYENCE CORPORATION).

-Printed image-
The image printed in the high-gloss printing mode was a total image having an image resolution of 600 dpi × 600 dpi and a printing rate of 100%.
The image printed in the low-gloss printing mode was a halftone image having an image resolution of 600 dpi × 600 dpi and a printing rate of 40%.

-Print rate-
The printing rate here means the following.
Printing rate (%) = number of clear ink printing dots / (vertical resolution x horizontal resolution) x 100
(However, in the above formula, the "number of clear ink printing dots" is the number of dots actually printed with clear ink per unit area, and the "vertical resolution" and "horizontal resolution" are the resolutions per unit area, respectively. When printing clear inks in layers so that they have the same dot position, the "clear ink printing dot number" is represented by the total number of dots actually printed with clear ink per unit area.)

In both the low-gloss printing mode and the high-gloss printing mode, printing was performed directly on the recording medium with clear ink. Table 3 shows the printing conditions and the temperature of the printing unit at this time.
Next, the glossiness and glossiness of the obtained printed matter were evaluated as follows, and how large the difference in glossiness between the high-gloss printing mode and the low-gloss printing mode was determined. The results are shown in Table 4.

<Glossiness>
The glossiness value of the obtained printed matter was measured at 60 ° using a glossiness measuring device (Microtrigloss, manufactured by BYK). At this time, the glossiness of any three points on the surface of the printed part on which the clear ink A of the printed matter was printed was measured, the average value was Gp, and the glossiness of the surface of the recording medium of the non-printed part was Gm.

<Glossy or matte>
The portion of the obtained printed matter covered with clear ink was visually evaluated based on the following criteria. The glossiness was evaluated in the high-gloss printing mode, and the matte feeling was evaluated in the low-gloss printing mode. In addition, A and B were accepted, and C was rejected.
[Evaluation criteria]
A: The clear ink printed part feels more glossy or matte than the clear ink unprinted part. B: The clear ink printed part feels more glossy or matte than the clear ink unprinted part, but clearly. C: The clear ink printed part does not feel glossy or matte, or feels weaker than the clear ink unprinted part.

<Judgment of high gloss / low gloss quality>
The numerical difference in glossiness of each clear ink and the sensory evaluation of glossiness were comprehensively considered, and the judgment was made as follows. AA to B were passed, and C was rejected.
[Evaluation criteria]
AA: The sum of the absolute values of the difference in glossiness between the clear ink printing part and the clear ink unprinted part in the high gloss printing mode and the low gloss printing mode (| Gp-Gm | in the high gloss printing mode and the low gloss printing mode). The sum of | Gp-Gm | and) is 120 or more, and the glossiness is both A. A: The glossiness of the clear ink printing part and the clear ink unprinted part in the high gloss printing mode and the low gloss printing mode. The sum of the absolute values of the differences (the sum of | Gp-Gm | in the high-gloss print mode and | Gp-Gm | in the low-gloss print mode) is 100 or more, and the glossiness is both A. B: The sum of the absolute values of the difference in glossiness between the clear ink printing part and the clear ink unprinted part in the high-gloss printing mode and the low-gloss printing mode (| Gp-Gm | in the high-gloss printing mode and | The sum with Gp-Gm |) is 80 or more, and the glossiness is B or more. C: Difference in glossiness between the clear ink printed portion and the clear ink unprinted portion in the high gloss printing mode and the low gloss printing mode. The sum of the absolute values of (the sum of | Gp-Gm | in the high-gloss print mode and | Gp-Gm | in the low-gloss print mode) is less than 80, or the glossiness is C.

(Example 2)
In Example 1, the heating conditions were set to 50 ° C., 50 ° C., and 70 ° C. for _{the heating temperatures (= T gloss} ) of the heaters before, during, and after printing in the high-gloss printing mode, and the low gloss was obtained. In the printing mode, inkjet printing was performed in the same manner as in Example 1 except that the heating temperature (= T _{matte) of each heater was set to 70 ° C., 70 ° C., and 70 ° C.}
With respect to the obtained printed matter, the glossiness, glossiness, and high gloss / low gloss quality were determined in the same manner as in Example 1. The results are shown in Table 4.
When the temperature of the recording medium during printing is measured, the temperature of the recording medium in the high-gloss printing mode is 49 ° C, and the temperature of the heating means in the high-gloss printing mode during printing is 50 ° C. Further, when the temperature of the recording medium during printing is measured, the temperature of the recording medium in the low-gloss printing mode is 68 ° C., and the temperature of the heating means in the low-gloss printing mode during printing is 70 ° C.

(Example 3)
Inkjet printing was performed in the same manner as in Example 2 except that the clear ink A was changed to the clear ink B in Example 2.
With respect to the obtained printed matter, the glossiness, glossiness, and high gloss / low gloss quality were determined in the same manner as in Example 1. The results are shown in Table 4.

(Example 4)
Inkjet printing was performed in the same manner as in Example 1 except that the clear ink A was changed to the clear ink C in Example 1.
With respect to the obtained printed matter, the glossiness, glossiness, and high gloss / low gloss quality were determined in the same manner as in Example 1. The results are shown in Table 4.

(Example 5)
Inkjet printing was performed in the same manner as in Example 2 except that the clear ink A was changed to the clear ink C in Example 2.
With respect to the obtained printed matter, the glossiness, glossiness, and high gloss / low gloss quality were determined in the same manner as in Example 1. The results are shown in Table 4.

(Example 6)
Inkjet printing was performed in the same manner as in Example 1 except that the clear ink A was changed to the clear ink D in Example 1.
With respect to the obtained printed matter, the glossiness, glossiness, and high gloss / low gloss quality were determined in the same manner as in Example 1. The results are shown in Table 4.

(Example 7)
Inkjet printing was performed in the same manner as in Example 2 except that the clear ink A was changed to the clear ink D in Example 2.
With respect to the obtained printed matter, the glossiness, glossiness, and high gloss / low gloss quality were determined in the same manner as in Example 1. The results are shown in Table 4.

(Example 8)
Inkjet printing was performed in the same manner as in Example 2 except that the clear ink A was changed to the clear ink E in Example 2.
With respect to the obtained printed matter, the glossiness, glossiness, and high gloss / low gloss quality were determined in the same manner as in Example 1. The results are shown in Table 4.

(Comparative Example 1)
Inkjet printing was performed in the same manner as in Example 1 except that the clear ink A was changed to the clear ink F in Example 1.
With respect to the obtained printed matter, the glossiness, glossiness, and high gloss / low gloss quality were determined in the same manner as in Example 1. The results are shown in Table 4.

(Comparative Example 2)
Inkjet printing was performed in the same manner as in Example 2 except that the clear ink A was changed to the clear ink F in Example 2.
With respect to the obtained printed matter, the glossiness, glossiness, and high gloss / low gloss quality were determined in the same manner as in Example 1. The results are shown in Table 4.

(Comparative Example 3)
Inkjet printing was performed in the same manner as in Example 2 except that the clear ink A was changed to the clear ink G in Example 2.
With respect to the obtained printed matter, the glossiness, glossiness, and high gloss / low gloss quality were determined in the same manner as in Example 1. The results are shown in Table 4.

From the results of Tables 2 to 4, according to the comparison between Examples 1, 2, 4 to 7 and Comparative Examples 1 and 2 regarding the glossiness and glossiness, the printing rate and the heating temperature were determined even with the same clear ink. It was found that the glossiness and glossiness can be changed by changing the glossiness. Here, when a clear ink containing the compound represented by the general formula (I) is used, the change in glossiness due to the heating temperature becomes large, and in particular, the compound represented by the general formula (II) is included. It was found that when the clear ink was used, the change in glossiness became larger and the decorativeness was higher.
Regarding the determination of the quality of high gloss / low gloss, according to the comparison between Examples 1 to 8 and Comparative Examples 1 to 3, when a clear ink containing the compound represented by the above general formula (I) was used, it was high. The change between the glossy printing mode and the low-glossy printing mode is sufficiently large, and the change in glossiness is particularly large when a clear ink containing the compound represented by the above general formula (II) is used. It turned out that it was highly decorative.

The viscosity of the clear ink used above increases at once with only a slight evaporation of water, and the wet spread of the ink coating film surface occurs only at the moment of landing. In this way, when the wetting and spreading of the ink coating film surface depends on the temperature of the recording medium at the time of printing, the surface shape is already determined even if the ink is heated after printing, and the remaining water only evaporates. Therefore, even if the heater temperature after printing is high in the high-gloss printing mode, it is considered that the low-gloss (matte tone) is not obtained.

ただし、前記一般式（Ｉ）中、ｍは、０〜２３の整数を示し、ｎは、１〜１０の整数を示す。ａは、１〜２３の整数を示し、ｂは、０〜２３の整数を示す。Ｒは、水素原子又は炭素数１〜４のアルキル基を表す。
＜３＞ 前記一般式（Ｉ）で表される化合物が、下記一般式（ＩＩ）で表される化合物である前記＜２＞に記載の液体を吐出する装置である。

ただし、前記一般式（ＩＩ）中、ｏは０〜４の整数、ｑは０〜３の整数、ｑ＋ｏは０〜７の整数、ｐは１〜２の整数、ｒは２〜１６の整数を示す。
＜４＞ 前記加熱手段は、Ｔ_{ｍａｔｔｅ}−Ｔ_{ｇｌｏｓｓ}≧１０［℃］となるように前記被印刷物を加熱する前記＜１＞から＜３＞のいずれかに記載の液体を吐出する装置である。
＜５＞ 前記液体に含まれる樹脂が、ポリウレタン樹脂である前記＜１＞から＜４＞のいずれかに記載の液体を吐出する装置である。
＜６＞ 前記液体中の樹脂の含有量が８質量％以上である前記＜１＞から＜５＞のいずれかに記載の液体を吐出する装置である。
＜７＞ 前記ポリエーテル変性シロキサン化合物が界面活性剤であり、前記界面活性剤の液体中の含有量が２質量％以下である前記＜１＞から＜６＞のいずれかに記載の液体を吐出する装置である。
＜８＞ 被印刷物に液体を吐出して印刷層を設ける印刷工程と、印刷された被印刷物を加熱する加熱工程と、を含む液体を吐出する方法であって、
前記液体が、樹脂、水、及びポリエーテル変性シロキサン化合物を含有するクリアインクであり、
前記液体を吐出する方法は、低光沢を付与する印刷モードである低光沢印刷モード及び高光沢を付与する印刷モードである高光沢印刷モードを有し、
前記低光沢印刷モードにおける前記加熱手段の温度をＴ_{ｍａｔｔｅ}［℃］とし、前記高光沢印刷モードにおける前記加熱手段の温度をＴ_{ｇｌｏｓｓ}［℃］とすると、次式、Ｔ_{ｍａｔｔｅ}＞Ｔ_{ｇｌｏｓｓ}、を満たすことを特徴とする液体を吐出する方法である。
＜９＞ 液体を収容する液体収容部と、
前記液体を被印刷物に吐出する液体吐出ヘッドと、
前記被印刷物を加熱する加熱手段と、
を有する印刷装置であって、
前記液体が、樹脂、水、及びポリエーテル変性シロキサン化合物を含有するクリアインクであり、
前記印刷装置は、低光沢を付与する印刷モードである低光沢印刷モード及び高光沢を付与する印刷モードである高光沢印刷モードを有し、
前記低光沢印刷モードにおける加熱手段の温度をＴ_{ｍａｔｔｅ}［℃］とし、前記高光沢印刷モードにおける加熱手段の温度をＴ_{ｇｌｏｓｓ}［℃］とすると、次式、Ｔ_{ｍａｔｔｅ}＞Ｔ_{ｇｌｏｓｓ}、を満たすことを特徴とする印刷装置である。
＜１０＞ 被印刷物に液体を吐出して印刷層を設ける印刷工程と、印刷された被印刷物を加熱する加熱工程と、を含む印刷方法であって、
前記液体が、樹脂、水、及びポリエーテル変性シロキサン化合物を含有するクリアインクであり、
前記印刷方法は、低光沢を付与する印刷モードである低光沢印刷モード及び高光沢を付与する印刷モードである高光沢印刷モードを有し、
前記低光沢印刷モードにおける加熱手段の温度をＴ_{ｍａｔｔｅ}［℃］とし、前記高光沢印刷モードにおける加熱手段の温度をＴ_{ｇｌｏｓｓ}［℃］とすると、次式、Ｔ_{ｍａｔｔｅ}＞Ｔ_{ｇｌｏｓｓ}、を満たすことを特徴とする印刷方法である。
＜１１＞ 被印刷物に液体を吐出して印刷層を設ける印刷工程と、印刷された被印刷物を加熱する加熱工程と、を含む印刷画像の光沢制御方法であって、
前記液体が、樹脂、水、及びポリエーテル変性シロキサン化合物を含有するクリアインクであり、
前記印刷画像の光沢制御方法は、低光沢を付与する印刷モードである低光沢印刷モード及び高光沢を付与する印刷モードである高光沢印刷モードを有し、前記低光沢印刷モードで印刷する場合には、加熱温度を高くする制御を行い、前記高光沢印刷モードで印刷する場合には、加熱温度を低くする制御を行うことを特徴とする印刷画像の光沢度制御方法である。 Examples of aspects of the present invention are as follows.
<1> A liquid storage unit that stores liquid and
A liquid discharge head that discharges the liquid onto the printed matter,
A heating means for heating the printed matter and
It is a device that discharges a liquid having
The liquid is a clear ink containing a resin, water, and a polyether-modified siloxane compound.
The device for discharging the liquid has a low-gloss printing mode, which is a printing mode for imparting low gloss, and a high-gloss printing mode, which is a printing mode for imparting high gloss.
_Assuming that the temperature of the heating means in the low-gloss printing mode is T matte [° C.] and the temperature of the heating means in the high-gloss printing mode is T _gloss [° C.], the following equation, T _matte > T _gloss , is satisfied. It is a device for discharging a liquid, which is characterized in that.
<2> The apparatus for discharging the liquid according to <1>, wherein the polyether-modified siloxane compound is at least one selected from the compounds represented by the following general formula (I).

However, in the general formula (I), m represents an integer of 0 to 23, and n represents an integer of 1 to 10. a represents an integer of 1 to 23, and b represents an integer of 0 to 23. R represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
<3> The device for discharging the liquid according to <2>, wherein the compound represented by the general formula (I) is a compound represented by the following general formula (II).

However, in the general formula (II), o is an integer of 0 to 4, q is an integer of 0 to 3, q + o is an integer of 0 to 7, p is an integer of 1 to 2, and r is an integer of 2 to 16. Shown.
<4> The heating means is a device that discharges the liquid according to any one of <1> to <3>, which heats the printed matter so that _{T matte} −T _{gloss ≧ 10 [° C.].}
<5> A device for discharging the liquid according to any one of <1> to <4>, wherein the resin contained in the liquid is a polyurethane resin.
<6> The device for discharging the liquid according to any one of <1> to <5>, wherein the content of the resin in the liquid is 8% by mass or more.
<7> Discharge the liquid according to any one of <1> to <6>, wherein the polyether-modified siloxane compound is a surfactant and the content of the surfactant in the liquid is 2% by mass or less. It is a device to do.
<8> A method of discharging a liquid including a printing step of discharging a liquid onto a printed matter to provide a printing layer and a heating step of heating the printed matter to be printed.
The liquid is a clear ink containing a resin, water, and a polyether-modified siloxane compound.
The method of discharging the liquid has a low-gloss printing mode, which is a printing mode for imparting low gloss, and a high-gloss printing mode, which is a printing mode for imparting high gloss.
_Assuming that the temperature of the heating means in the low-gloss printing mode is T matte [° C.] and the temperature of the heating means in the high-gloss printing mode is T _gloss [° C.], the following equation, T _matte > T _gloss , is satisfied. This is a method for discharging a liquid.
<9> A liquid storage unit that stores liquid and
A liquid discharge head that discharges the liquid onto the printed matter,
A heating means for heating the printed matter and
Is a printing device that has
The liquid is a clear ink containing a resin, water, and a polyether-modified siloxane compound.
The printing apparatus has a low-gloss printing mode, which is a printing mode for imparting low gloss, and a high-gloss printing mode, which is a printing mode for imparting high gloss.
_Assuming that the temperature of the heating means in the low-gloss printing mode is T matte [° C.] and the temperature of the heating means in the high-gloss printing mode is T _gloss [° C.], the following equation, T _matte > T _gloss , is satisfied. It is a characteristic printing device.
<10> A printing method including a printing step of ejecting a liquid onto a printed matter to provide a printing layer and a heating step of heating the printed matter to be printed.
The liquid is a clear ink containing a resin, water, and a polyether-modified siloxane compound.
The printing method has a low-gloss printing mode, which is a printing mode for imparting low gloss, and a high-gloss printing mode, which is a printing mode for imparting high gloss.
_Assuming that the temperature of the heating means in the low-gloss printing mode is T matte [° C.] and the temperature of the heating means in the high-gloss printing mode is T _gloss [° C.], the following equation, T _matte > T _gloss , is satisfied. This is a characteristic printing method.
<11> A method for controlling gloss of a printed image, which includes a printing step of discharging a liquid onto a printed matter to provide a printing layer and a heating step of heating the printed matter to be printed.
The liquid is a clear ink containing a resin, water, and a polyether-modified siloxane compound.
The gloss control method for a printed image has a low gloss printing mode which is a printing mode for imparting low gloss and a high gloss printing mode which is a printing mode for imparting high gloss, and when printing in the low gloss printing mode. Is a method for controlling the glossiness of a printed image, which comprises controlling the heating temperature to be high and lowering the heating temperature when printing in the high gloss printing mode.

The device for discharging the liquid according to any one of <1> to <7>, the method for discharging the liquid according to the above <8>, the printing device according to the above <9>, and the above-mentioned <10>. According to the printing method and the glossiness control method of the printed image according to the above <11>, various problems in the prior art can be solved and the object of the present invention can be achieved.

2 Recording head 3 Platen 4 Roll media housing 15 Carriage 29 Recording media 30 Roll media (recording media)
34 Feed roller 35 Presser roller 39 Take-up roll 40 Preheater 41 Print heater 42 Post heater 43 Warm air fan 60 Transport means 400 Image forming device 401 Exterior 401c cover 404 Cartridge holder 410, 410k, 410c, 410m, 410y Main tank 411 Ink storage Part 413 Ink discharge port 414 Storage container case 420 Mechanism part 434 Discharge head 436 Supply tube L Ink storage container

Japanese Unexamined Patent Publication No. 2015-3397 Japanese Unexamined Patent Publication No. 2009-20834

Claims (11)

A liquid storage unit that stores liquid and
A liquid discharge head that discharges the liquid onto the printed matter,
A heating means for heating the printed matter and
It is a device that discharges a liquid having
The liquid is a clear ink containing a resin, water, and a polyether-modified siloxane compound.
The device for discharging the liquid has a low-gloss printing mode, which is a printing mode for imparting low gloss, and a high-gloss printing mode, which is a printing mode for imparting high gloss.
_Assuming that the temperature of the heating means in the low-gloss printing mode is T matte [° C.] and the temperature of the heating means in the high-gloss printing mode is T _gloss [° C.], the following equation, T _matte > T _gloss , is satisfied. A device that discharges a liquid. The apparatus for discharging the liquid according to claim 1, wherein the polyether-modified siloxane compound is at least one selected from the compounds represented by the following general formula (I).

However, in the general formula (I), m represents an integer of 0 to 23, and n represents an integer of 1 to 10. a represents an integer of 1 to 23, and b represents an integer of 0 to 23. R represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms. The device for discharging the liquid according to claim 2, wherein the compound represented by the general formula (I) is a compound represented by the following general formula (II).

However, in the general formula (II), o is an integer of 0 to 4, q is an integer of 0 to 3, q + o is an integer of 0 to 7, p is an integer of 1 to 2, and r is an integer of 2 to 16. Shown. The device for discharging the liquid according to any one of claims 1 to 3, wherein the heating means _{heats the printed matter so that T matte} −T _{gloss ≧ 10 [° C.].} The device for discharging the liquid according to any one of claims 1 to 4, wherein the resin contained in the liquid is a polyurethane resin. The device for discharging the liquid according to any one of claims 1 to 5, wherein the content of the resin in the liquid is 8% by mass or more. The apparatus for discharging the liquid according to any one of claims 1 to 6, wherein the polyether-modified siloxane compound is a surfactant, and the content of the surfactant in the liquid is 2% by mass or less. A method of ejecting a liquid including a printing step of ejecting a liquid to a printed matter to provide a printing layer and a heating step of heating the printed matter to be printed.
The liquid is a clear ink containing a resin, water, and a polyether-modified siloxane compound.
The method of discharging the liquid has a low-gloss printing mode, which is a printing mode for imparting low gloss, and a high-gloss printing mode, which is a printing mode for imparting high gloss.
_Assuming that the temperature of the heating means in the low-gloss printing mode is T matte [° C.] and the temperature of the heating means in the high-gloss printing mode is T _gloss [° C.], the following equation, T _matte > T _gloss , is satisfied. A characteristic method of discharging a liquid. A liquid storage unit that stores liquid and
A liquid discharge head that discharges the liquid onto the printed matter,
A heating means for heating the printed matter and
Is a printing device that has
The liquid is a clear ink containing a resin, water, and a polyether-modified siloxane compound.
The printing apparatus has a low-gloss printing mode, which is a printing mode for imparting low gloss, and a high-gloss printing mode, which is a printing mode for imparting high gloss.
_Assuming that the temperature of the heating means in the low-gloss printing mode is T matte [° C.] and the temperature of the heating means in the high-gloss printing mode is T _gloss [° C.], the following equation, T _matte > T _gloss , is satisfied. A featured printing device. A printing method including a printing step of discharging a liquid onto a printed matter to provide a printing layer and a heating step of heating the printed matter to be printed.
The liquid is a clear ink containing a resin, water, and a polyether-modified siloxane compound.
The printing method has a low-gloss printing mode, which is a printing mode for imparting low gloss, and a high-gloss printing mode, which is a printing mode for imparting high gloss.
_Assuming that the temperature of the heating means in the low-gloss printing mode is T matte [° C.] and the temperature of the heating means in the high-gloss printing mode is T _gloss [° C.], the following equation, T _matte > T _gloss , is satisfied. A printing method characterized by that. A method for controlling gloss of a printed image, which includes a printing step of discharging a liquid onto a printed matter to provide a printing layer and a heating step of heating the printed matter to be printed.
The liquid is a clear ink containing a resin, water, and a polyether-modified siloxane compound.
The gloss control method for a printed image has a low gloss printing mode which is a printing mode for imparting low gloss and a high gloss printing mode which is a printing mode for imparting high gloss, and when printing in the low gloss printing mode. Is a method for controlling the glossiness of a printed image, which controls the heating temperature to be raised, and lowers the heating temperature when printing in the high gloss printing mode.

Images