JP2015205469A - Inkjet recording method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method capable of forming an image having high durability in a short time.SOLUTION: Provided is an inkjet recording method including: a step of applying ink to a recording medium; a step of drying the recording medium to obtain a semi-dry film; a step of applying a liquid composition to the half-dry film; and a step of drying the recording medium. The ink includes: a color material; a water soluble solvent; resin particles and water, the solution composition includes at least one kind of solvent selected from 1,3-butanediol, ethylene glycol ethers having prescribed SP value and vapor pressure at 20°C and diethylene glycol ethers, the content of the solvent in the liquid composition is 30 mass% or higher, the content of the water in the liquid composition is 20 mass% or lower, and, in the step of obtaining the half-dry film, drying is performed till the content of the water included in the half-dry film reaches 10 mass% or lower to 100 mass% of the ink applied to the recording medium.

Description

  The present invention relates to an ink jet recording method.

  In an inkjet recording method in which an image is formed on a non-absorbing or hardly absorbing medium by an inkjet method, a method using a water-based pigment ink containing a resin component for improving the fixability and weather resistance of a pigment has been proposed ( For example, see Patent Literature 1 and Patent Literature 2). In Patent Document 2, the fixing of a pigment in recording on a non-absorbable recording medium with a water-based ink containing a pigment and an emulsion resin starts heating after an ink droplet has landed on the recording medium. It is disclosed that this is done by heating the recording medium.

JP 2010-248357 A JP 2002-371111 A

  However, in recent years, further speeding up of print production has been required, and it is difficult to form an image having high durability in a short time on a non-water-absorbing recording medium using an ink jet recording head. The present invention has been made in view of such a situation, and an object thereof is to provide a method capable of forming an image having high durability in a short time.

An ink jet recording method according to the present invention includes a step of applying ink to a recording medium using an ink jet recording head;
Drying the recording medium provided with the ink to obtain a semi-dry film of the ink;
Applying a liquid composition to at least a portion of the semi-dry film;
Drying the recording medium provided with the liquid composition;
An inkjet recording method comprising:
The ink contains a color material, a water-soluble solvent, resin particles, and water,
The liquid composition has 1,3-butanediol, an SP value of 17.4 (J / cm ³ ) ^1/2 or more and 23.8 (J / cm ³ ) ^1/2 or less, and at 20 ° C. An ethylene glycol ether having a vapor pressure of 8.0 Pa or more and 826.6 Pa or less, and an SP value of 17.4 (J / cm ³ ) ^1/2 or more and 23.8 (J / cm ³ ) ^1/2 or less And at least one solvent selected from the group consisting of diethylene glycol ethers having a vapor pressure at 20 ° C. of 8.0 Pa or more and 826.6 Pa or less,
The content of the solvent in the liquid composition is 30% by mass or more,
The content of water in the liquid composition is 20% by mass or less,
In the step of obtaining the semi-dry film, the recording medium to which the ink is applied until the amount of water contained in the semi-dry film becomes 10% by mass or less with respect to 100% by mass of the ink applied to the recording medium. It is a process of drying.

  According to the present invention, an image having high durability can be formed in a short time.

It is sectional drawing which shows an example of the inkjet recording device used for the inkjet recording method which concerns on this invention.

The inkjet recording method according to the present invention includes a step of applying ink to a recording medium using an inkjet recording head, a step of drying the recording medium to which the ink has been applied to obtain a semi-dry film of the ink, An ink jet recording method comprising a step of applying a liquid composition to at least a part of a semi-dry film, and a step of drying a recording medium to which the liquid composition has been applied, wherein the ink comprises a coloring material, The liquid composition contains a water-soluble solvent, resin particles, and water, and the liquid composition has 1,3-butanediol and an SP value of 17.4 (J / cm ³ ) ^1/2 or more and 23.8 (J / cm ³ ) ^1/2 or less, and an ethylene glycol ether having a vapor pressure at 20 ° C. of 8.0 Pa or more and 826.6 Pa or less, and an SP value of 17.4 (J / cm ³ ) ^1/2 23. ^{(J /} cm ³⁾ is ^1/2 or less, and contains at least one solvent having a vapor pressure at 20 ° C. is selected from the group consisting of diethylene glycol ethers or less 826.6Pa than 8.0 Pa, The step of obtaining the semi-dried film in which the content of the solvent in the liquid composition is 30% by mass or more and the content of water in the liquid composition is 20% by mass or less is obtained on the recording medium. This is a step of drying the recording medium to which the ink is applied until the amount of water contained in the semi-dry film becomes 10% by mass or less with respect to 100% by mass of the applied ink.

  In the method according to the present invention, the liquid composition used as the fixing solution for the printed matter contains the above-mentioned predetermined solvent, has the above-mentioned predetermined composition, and the semi-dried film of the ink before applying the liquid composition. The amount of moisture is in the predetermined range. As a result, when the liquid composition is applied, the liquid composition dissolves the resin particles contained in the ink, and the semi-dry film of the ink is re-dissolved, thereby forming a flat and high-density film and fixing the printed matter. And an image with high durability can be obtained in a short time. Hereinafter, although embodiment of this invention is shown, this invention is not limited to these.

<Recording medium>
The recording medium according to the present invention is not particularly limited. For example, a non-absorbing medium or a hardly absorbing medium such as art paper, coated paper, polyvinyl chloride film, polypropylene film, PET film, tarpaulin, and polyester cloth can be used. . Among these, from the viewpoint of weather resistance, a polyvinyl chloride film is preferable as the recording medium. In particular, it is preferable that the Ka value (ml / m ² · msec ^1/2 ) with respect to water obtained by the liquid absorptivity measurement by the Bristow method of the recording medium is 0.2 or less.

<Ink>
The ink according to the present invention includes a color material, a water-soluble solvent, resin particles, and water. The ink may contain a surfactant and other components. The pH of the ink is not particularly limited as long as the stability of the ink is maintained, but neutral is preferable from the viewpoint that better dispersibility of solid components such as resin particles is maintained, and the pH is 5 to 10. It is preferable. The pH is a value measured using D-51 (product name, manufactured by HORIBA, Ltd.).

(Color material)
As the color material, any of a pigment and a dye can be used, and these can also be mixed and used. The pigment is not particularly limited and may be appropriately selected depending on the purpose, and may be either an inorganic pigment or an organic pigment. You may use these pigments in mixture of multiple types. Although it does not specifically limit as said dye, The dye classified into an acid dye, a direct dye, a basic dye, a reactive dye, and a food dye in a color index is preferable from a viewpoint excellent in water resistance and light resistance. These dyes may be used in combination of a plurality of types, and may be used in combination with other colorants such as pigments as necessary. The content of the color material in the ink is preferably 1% by mass or more and 20% by mass or less, and more preferably 2% by mass or more and 10% by mass or less.

(Water-soluble solvent)
In the present invention, the water-soluble solvent refers to a solvent that can obtain a uniform solution by mixing with water at an appropriate ratio. Examples of the water-soluble solvent include 2-pyrrolidone, 2-methyl-1,3-propanediol, ethanol, diethylene glycol and the like. These water-soluble solvents may be used alone or in combination of two or more. The content of the water-soluble solvent in the ink is preferably 5% by mass or more and 40% by mass or less, and more preferably 10% by mass or more and 30% by mass or less.

(Resin particles)
The ink according to the present invention includes resin particles. When the ink contains resin particles, an image having better abrasion resistance can be formed on the recording medium. In particular, when recording using an ink containing the resin particles on a non-ink-absorbing or low-ink-absorbing recording medium such as a polyvinyl chloride film or a polypropylene film, a heat-fixing step is performed to improve the resistance. An image having excellent rubbing properties can be formed. This is because the resin particles can solidify the ink and the solidified ink can be firmly fixed on the recording medium by the heat fixing step. These effects can be further enhanced by heating. In particular, the resin particles are preferably contained in a dispersed state in the ink. When the ink contains resin particles in a fine particle state, it is easy to adjust the viscosity of the ink to an appropriate range in the ink jet recording method, and it is easy to ensure storage stability and ejection stability. In addition, when the ink is landed on the recording medium, aggregation of the coloring material and the like can be suppressed, and occurrence of density unevenness and bleeding can be suppressed.

  The resin particles are not particularly limited as long as they can be used in the ink as a component for drying and fixing the pigment in the ink onto the recording medium. For example, from the resin particles for fixing the pigment of the ink-jet ink, those capable of obtaining the desired effect in combination with the liquid composition can be selected and used. As a material of such resin particles, styrene / acrylic polymer, polyurethane and the like are preferable from the viewpoint of the solubility of the resin particles when the liquid composition is applied. These resins may be used alone or in combination of two or more. The average particle diameter of the resin particles is preferably 5 nm or more and 400 nm or less, and more preferably 50 nm or more and 300 nm or less, from the viewpoint of ensuring the storage stability and ejection stability of the ink.

  The content of the resin particles in the ink is preferably 15% by mass or less, more preferably 0.5% by mass or more and 10% by mass or less in terms of solid content. When the content is within this range, the ink can be firmly solidified and fixed on the recording medium by the method according to the present invention even on the non-ink-absorbing or low-ink-absorbing recording medium.

(water)
It is preferable to use deionized water (ion exchange water) as water. The content of water in the ink is preferably 50% by mass or more and 80% by mass or less, and more preferably 55% by mass or more and 75% by mass or less. By using water as the main solvent of the ink, the viscosity of the ink is reduced as compared with the case where the organic solvent is used as the main solvent, and the ink can be stably ejected from the inkjet recording head.

(Surfactant)
As the surfactant, a nonionic surfactant is preferable. The nonionic surfactant has an action of spreading the ink uniformly on the recording medium. Therefore, when the ink contains a nonionic surfactant, a clear image can be obtained with less uneven density and blurring. Nonionic surfactants include, for example, polyoxyethylene alkyl ether surfactants, polyoxypropylene alkyl ether surfactants, polycyclic phenyl ether surfactants, sorbitan derivatives, fluorine surfactants, silicone surfactants Examples thereof include an activator and an acetylene glycol surfactant. Among these, a fluorosurfactant and a silicone-based surfactant are preferable as the surfactant from the viewpoint of particularly excellent effects described above. These surfactants may be used alone or in combination of two or more. The content of the surfactant in the ink is preferably 0.1% by mass or more and 5% by mass or less, and more preferably 0.5% by mass or more and 2% by mass or less.

(Other ingredients)
In addition to the above-described components, the ink may contain nitrogen-containing compounds such as urea and ethylene urea, antifoaming agents, rust preventives, antiseptics, antifungal agents, antioxidants, anti-reducing agents, evaporation accelerators, Other components such as chelating agents may be included. Further, from the viewpoint of improving heat absorption characteristics in fixing, the ink may contain an infrared absorbing material. These other components may be used alone or in combination of two or more.

<Liquid composition>
The liquid composition according to the present invention has an action of re-dissolving resin particles, unlike a reaction liquid having an action of aggregating a coloring material with a polyvalent metal or a resin. The mechanism of the phenomenon that the liquid composition according to the present invention improves the fixing power of the printed matter is not clear. However, since the liquid composition dissolves the resin particles, if the liquid composition is applied when the ink coating film is in a semi-dried state, it is flat and hardly caught by re-dissolution of the ink semi-dry film. It is presumed that a strong film is formed and the fixing power of the printed matter is improved.

The liquid composition according to the present invention contains at least one solvent selected from the group consisting of 1,3-butanediol (hereinafter also referred to as 13BD), ethylene glycol ethers, and diethylene glycol ethers. The SP value of the ethylene glycol ethers and the diethylene glycol ethers is 17.4 (J / cm ³ ) ^1/2 or more and 23.8 (J / cm ³ ) ^1/2 or less, and the vapor pressure at 20 ° C. Is 8.0 Pa or more and 826.6 Pa or less. When the liquid composition contains the solvent, the semi-dry film of the ink can be appropriately redissolved, and the fixing ability of the printed matter is improved.

The SP value of the ethylene glycol ethers and the diethylene glycol ethers is 21.5 (J / cm ³ ) ^1/2 or more and 22.3 (J / cm ³ ) ^1/2 or less. It is preferable from the viewpoint of improvement. The SP value is a literature value. In addition, the SP value range in the present invention is defined in consideration of variations in SP values obtained by various measurement methods. The vapor pressure of the ethylene glycol ethers and diethylene glycol ethers at 20 ° C. is preferably 16.0 Pa or more and 826.6 Pa or less from the viewpoint of improving the fixing power of the printed matter. The vapor pressure is more preferably 16.0 Pa or more and 24.0 Pa or less. The vapor pressure is a literature value.

Examples of the ethylene glycol ethers include ethylene glycol monomethyl ether (hereinafter also referred to as EGME, SP value: 23.3 (J / cm ³ ) ^1/2 , vapor pressure at 20 ° C .: 826.6 Pa), ethylene glycol monoethyl ether. (Hereinafter also referred to as EGEE, SP value: 21.5 (J / cm ³ ) ^1/2 , vapor pressure at 20 ° C .: 506.6 Pa) and the like.

Examples of the diethylene glycol ethers include diethylene glycol monomethyl ether (hereinafter also referred to as DEGME, SP value: 17.4 (J / cm ³ ) ^1/2 , vapor pressure at 20 ° C .: 24.0 Pa), diethylene glycol monoethyl ether (hereinafter referred to as DEGEE). Also shown are SP values: 22.3 (J / cm ³ ) ^1/2 , vapor pressure at 20 ° C .: 16.0 Pa), and the like.

  The content rate of the said solvent in a liquid composition is 30 mass% or more. When the content is less than 30% by mass, the effect of improving the fixing power of the printed matter cannot be obtained sufficiently. The content is preferably 40% by mass or more and 90% by mass or less, and more preferably 50% by mass or more and 80% by mass or less.

  The liquid composition preferably contains a water-soluble solvent. As the water-soluble solvent, a solvent similar to the water-soluble solvent contained in the ink described above can be used. Among these, ethanol is preferable as the water-soluble solvent contained in the liquid composition from the viewpoint of evaporability. The content of the water-soluble solvent in the liquid composition is preferably 20% by mass or more and 80% by mass or less, more preferably 30% by mass or more and 70% by mass or less, and 40% by mass or more and 60% by mass. More preferably, it is% or less.

  The content of water in the liquid composition is 20% by mass or less. From the turbidity observation, 1,3-butanediol, ethylene glycol ethers, and diethylene glycols have been investigated by the present inventors, and the solubility of the resin particles increases in a state where there is little water compared to a state where there is much water. I know. Therefore, from the viewpoint of sufficiently exhibiting the solubility of the resin particles and improving the fixing power of the printed matter, in the present invention, water is not included in the liquid composition, or the water content is low. That is, the water content is set to 20% by mass or less. The content is preferably 10% by mass or less, and more preferably 5% by mass or less. As described above, the content may be 0% by mass.

  In addition to the above components, the liquid composition may contain, as necessary, nitrogen-containing compounds such as urea and ethylene urea, resins, surfactants, antifoaming agents, rust preventives, antiseptics, antifungal agents, antioxidants, Various additives such as a reduction inhibitor, an evaporation accelerator, and a chelating agent may be included. Further, from the viewpoint of improving heat absorption characteristics in fixing, the liquid composition may contain an infrared absorbing material. These components may be used alone or in combination of two or more.

<Inkjet recording apparatus and inkjet recording method>
An example of an ink jet recording apparatus suitable for carrying out the ink jet recording method according to the present invention will be described below with reference to FIG. FIG. 1 is a sectional view of the main configuration of the inkjet recording apparatus 100 in the transport direction. The recording medium P is conveyed in the direction indicated by the arrow 1 by a paper feed roller (not shown). The recording medium P fed along the direction of the arrow 1 is conveyed between the LF roller 17 and the pinch roller 16 and directly under the ink jet recording head 101 as these rollers rotate. The ink jet recording head 101 is mounted on a carriage (not shown) supported by an aluminum stay 102. Thus, the recording medium P is scanned in the main scanning direction (direction perpendicular to the paper surface of FIG. 1), and ink is ejected during this time to perform recording on the recording medium P. In addition, an encoder (not shown) that rotates coaxially with the LF roller 17 is provided. As a result, the rotation amount of the LF roller 17 is detected with a resolution of 1/2400 inch in terms of the conveyance distance of the recording medium P. The platen 19 supports the conveyed recording medium P from below. The liquid drying device 15 is disposed on the downstream side in the transport direction of the ink jet recording head 101 or directly above the ink jet recording head 101. The liquid drying device 15 partially drys the ink coating film. The liquid drying device 15 includes a sheathed heater 31 and an infrared reflecting plate 32. The infrared reflecting plate 32 surrounds the back side of the sheathed heater 31 as viewed from the conveyance path side of the recording medium P, and has a shape with an opening formed on the front side (conveyance path side), from the sheathed heater 31 to the back side. It is provided so as to reflect the irradiated heat toward the conveyance path. The infrared sensor 23 measures the temperature on the recording medium P in the recording area, and controls the output of the sheathed heater 31 via the control device 11. At this time, the temperature of the ink on the recording medium P is preferably controlled so as not to exceed the glass transition temperature of the resin particles contained in the ink. The heating device used in the liquid drying device 15 is not particularly limited as long as the temperature can be controlled, and a radiation heating type sheathed heater or an infrared heater may be used. Further, a contact heating type sheet heater may be installed on the platen 19 and heated from the back surface of the recording medium P. A combination of a radiant heating type heater and a contact heating type heater may also be used.

  The film drying apparatus 50 partially dries the ink coating film to form an ink semi-dry film. The film drying apparatus 50 includes two sheathed heaters 51 for supplying energy for drying ink. The film drying apparatus 50 has a shape that surrounds the back side of the sheathed heater 51 as viewed from the conveyance path side of the recording medium P and has an opening formed on the front side (conveyance path side). A reflection plate 52 that reflects the irradiated heat toward the conveyance path is provided. The shape and the like of the reflection plate 52 are adjusted so that when the sheathed heater 51 generates heat, the amount of heat applied to the recording medium P is substantially uniform over substantially the entire irradiation range. The infrared sensor 24 measures the temperature on the recording medium P immediately below the sheathed heater 52 and controls the heating temperature via the control device 11. At this time, the temperature of the ink on the recording medium P is preferably 65 ° C. or higher. When the temperature of the ink is 65 ° C. or higher, the strength at which the ink is fixed to the recording medium P is improved. The heating device used in the film drying apparatus 50 is not particularly limited as long as the temperature can be controlled, and a radiation heating type sheathed heater or an infrared heater may be used, or a contact heating type sheet heater may be used. Good. Further, a radiation heating type heater and a contact heating type seat heater may be used in combination. The fixing platen 20 supports the back surface of the transported recording medium P.

  As described above, the ink ejected from the ink jet recording head 101 and landed on the recording medium P is dried to a semi-dry state by the liquid drying device 15 and the downstream film drying device 50. In the method according to the present invention, the recording medium to which the ink is applied is dried until the amount of water contained in the semi-dry film of the ink is 10% by mass or less with respect to 100% by mass of the ink applied to the recording medium P. To do. If the amount of water contained in the semi-dry film of the ink exceeds 10% by mass with respect to 100% by mass of the ink applied to the recording medium P, the solubility of the resin particles by the liquid composition is lowered, and the printed matter is fixed. Power is reduced. The amount of water contained in the semi-dry film of the ink with respect to 100% by mass of the ink applied to the recording medium P is preferably 7% by mass or less, and more preferably 5% by mass or less. The ink semi-dry film may not contain water, and this dry film also corresponds to the ink semi-dry film in the present invention. The semi-dried film has a water content of 10% by mass or less with respect to the ink mass upon landing, but the solvent amount may be 10% by mass or more with respect to the ink mass upon landing. In addition, when the ink contains a volatile component other than water, this component may be removed together with water when the semi-dry film is formed.

The liquid composition applying device 61 applies the liquid composition to at least a part of the semi-dry film of the ink on the recording medium P by a spray mechanism (not shown). The application amount of the liquid composition can be appropriately selected in consideration of the type of the recording medium P, image density, ambient environmental conditions, and the like. For example, 0.2 to ² mg can be applied per 1 cm ² . The spray mechanism may be a spray method or an ink jet method, but may be a coating method using a bar coater or a gravure roller. The liquid composition may be applied to at least a part of the semi-dry film of the ink, or may be applied to the entire surface of the semi-dry film of the ink.

  The recording medium P is further conveyed and reaches directly below the fixing device 53. The fixing device 53 dries the semi-dry film of the ink to which the liquid composition is applied, and fixes the printed matter to the recording medium P. The fixing device 53 surrounds the back side of the sheathed heater 54 when viewed from the conveyance path side of the recording medium P and has a shape with an opening formed on the front side (conveyance path side). A reflecting plate 55 is provided for reflecting the generated heat to the conveyance path side. The shape and the like of the reflection plate 55 are adjusted so that when the sheathed heater 54 generates heat, the amount of heat applied to the recording medium P is substantially uniform over substantially the entire irradiation range. The infrared sensor 25 measures the temperature on the recording medium P immediately below the sheathed heater 54, and controls the heating temperature via the control device 11. Note that, from the viewpoint of heating the recording medium P more quickly and uniformly, the liquid drying device 15, the film drying device 50, and the fixing device 53 may each include a blowing mechanism such as a fan or a duct.

  Examples of the present invention will be described below, but the present invention is not limited to these examples.

<SP value of solvent>
The SP value of the solvent is a value obtained from the website of Daikin Chemical Industry Co., Ltd. in 2005, and Prof. Hideki Yamamoto, Kansai University.

<Measurement of the ratio of the amount of water contained in the semi-dry film>
The semi-dry film for measurement formed on the recording medium immediately after passing through the film drying apparatus is taken out and included in the semi-dry film using a gas chromatograph (product name: GC-MS TRACE GC Ultra, manufactured by Thermo Scientific). The amount of water produced was measured. The ratio of the amount of water contained in the semi-dry film is a value obtained by dividing the amount of water contained in the semi-dry film by the amount of ink applied to the recording medium. The amount of ink applied to the recording medium is the amount of non-aqueous component applied to the recording medium obtained by multiplying the amount of ink obtained from the ejection number and droplet size by the ratio of the non-aqueous component in the ink before ejection. The amount of water contained in the semi-dry membrane is added.

<Scratch test>
Rub 200 times with a single fiber cloth for JIS dyeing fastness test using an apparatus conforming to the friction tester type II (Gakushin type) specified in the dyeing fastness test method (JIS L-0849). It was. Thereafter, the rubbing portion and its peripheral portion were read as an image with a scanner (product name: CanoScan 9000F, manufactured by Canon Inc.). Next, using image processing software (trade name: Photoshop, manufactured by Adobe), the color value of the non-printed portion on the recording medium is 255, and the color value of the non-rubbed portion of the printed portion is 256 gradations. The color of the rubbing part was quantified. The average value was divided by the maximum value of 255, and the value obtained by subtracting this value from 1 was multiplied by 100 to obtain the residual rate. Evaluation was carried out according to the criteria shown in Table 1 by averaging the residual ratio of each color.

<Example 1>
(ink)
The pigment dispersion includes CAB-O-JET 300 (Bk) / CAB-O-JET 270Y (Y) / CAB-O-JET 260M (M) / CAB-O-JET 250C (C) Cabot) were used. As the resin water dispersion, Jonkrill 390 (trade name, manufactured by BASF, styrene / acrylic polymer emulsion, hereinafter referred to as Jonkrill) was used. As the surfactant, ZONYL FSO (trade name, manufactured by DuPont), which is a fluorine-based surfactant, was used. Proxel was used as an antifungal agent. These were blended to prepare inks having the compositions shown in Table 2. The pH of the ink was 9.2.

(Liquid composition)
Liquid compositions having the compositions shown in Table 3 were prepared. The liquid composition contains 50% by mass of DEGEE and 50% by mass of ethanol.

(Inkjet recording)
Recording was performed using the ink jet recording apparatus described in FIG. As the recording medium, a polyvinyl chloride film (trade name: KSM-VS, manufactured by Kimoto Co., Ltd., hereinafter referred to as polyvinyl chloride) was used. As the reflecting plate 52 of the film drying apparatus 50, a reflecting plate having a width in the transport direction of 250 mm (hereinafter referred to as a standard width) was used. In the examples described later, a reflector (400 mm, hereinafter referred to as a wide width; 100 mm, hereinafter referred to as a narrow width) having a different width in the transport direction may be used in order to change the drying time. In this case, the experiment was performed by appropriately replacing the reflector 52. At that time, the position of the sheathed heater 51 and the heating range of the fixing platen 20 were changed in accordance with the width.

First, the ink was ejected onto the recording medium P using the inkjet recording head 101 to produce 100% duty solid patches (width 4 cm / length 20 cm) for each color. “Duty” is a value calculated by the equation: duty (%) = actual printing dot number / (vertical pixel number × horizontal pixel number) × 100. Next, the recording medium provided with the ink was dried using the liquid drying device 15 and the film drying device 50 to obtain a semi-dry film of the ink. Next, 1 g of the liquid composition was applied per 1 cm ² to the semi-dry film of the ink using the liquid composition applying device 61. Next, the semi-dry film of the ink to which the liquid composition was applied was dried by the fixing device 53, and ink jet recording was completed. The results are shown in Table 3.

<Examples 2 to 6>
InkJet recording was performed and evaluated in the same manner as in Example 1 except that the composition of the liquid composition, the type of recording medium, and the width of the reflecting plate 52 were changed as shown in Table 3. The results are shown in Table 3. In Example 5, printing paper (trade name: Aurora Coat, Nippon Paper Industries Co., Ltd., Ka value: 0.2 ml / m ² · msec ^1/2 ) was used as the recording medium. In Example 6, a cloth-based medium (trade name: SS2020, manufactured by Seiren Shoji Co., Ltd., Ka value: 0.0 ml / m ² · msec ^1/2 ) was used as the recording medium.

<Examples 7 to 12>
InkJet recording was performed and evaluated in the same manner as in Example 1 except that the composition of the liquid composition, the type of recording medium, and the width of the reflecting plate 52 were changed as shown in Table 4. The results are shown in Table 4.

<Examples 13 to 18>
Except that the composition of the liquid composition was changed as shown in Table 5, inkjet recording was performed and evaluated in the same manner as in Example 1. The results are shown in Table 5.

<Examples 19 to 22>
InkJet recording was performed and evaluated in the same manner as in Example 1 except that the composition of the ink and the composition of the liquid composition were changed as shown in Table 6. The results are shown in Table 6. In Example 22, Superflex E4000 (trade name, manufactured by Daiichi Kogyo Seiyaku Co., Ltd., polyurethane aqueous dispersion, hereinafter referred to as Superflex) was used as the resin water dispersion used for preparing the ink.

<Comparative Examples 1 to 5>
Except that the composition of the liquid composition and the width of the reflecting plate 52 were changed as shown in Table 7, ink jet recording was performed and evaluated in the same manner as in Example 1. The results are shown in Table 7.

<Comparative Examples 6 to 10>
Except that the composition of the liquid composition and the width of the reflecting plate 52 were changed as shown in Table 8, ink jet recording was performed and evaluated in the same manner as in Example 1. The results are shown in Table 8. 14BD represents 1,4-butanediol, AC represents acetone, 2Py represents 2-pyrrolidone, and 2M13PD represents 2-methyl-1,3-propanediol.

<Comparative Examples 11 to 13>
Except that the composition of the liquid composition and the width of the reflecting plate 52 were changed as shown in Table 9, ink jet recording was performed and evaluated in the same manner as in Example 1. The results are shown in Table 9. DIBC represents diisobutyl ketone, and DEGBE represents diethylene glycol monobutyl ether.

<Comparative example 14>
Ink jet recording was performed and evaluated in the same manner as in Example 1 except that the liquid composition was not applied and the width of the reflector 52 was wide. The results are shown in Table 9.

  From Tables 2 to 9, it was confirmed that in Examples 1 to 22 that satisfy the requirements of the present invention, the remaining rate was 80% or more in the surface scratch test, and a printed matter having excellent fixing power was obtained. On the other hand, in Comparative Example 8 in which acetone having a high vapor pressure but having an SP value within the range of the present invention is used as a solvent, the semi-dried film evaporates before being sufficiently redissolved. Couldn't be raised. Further, in Comparative Example 9 in which 2-pyrrolidone having a low vapor pressure was used as a solvent, evaporation of 2-pyrrolidone did not end in the fixing device 53, and as a result, 2-pyrrolidone remained in the film, and the printed matter was fixed. Could not do enough.

DESCRIPTION OF SYMBOLS 100 Inkjet recording apparatus 101 Inkjet recording head 102 Aluminum stay 11 Control apparatus 15 Liquid drying apparatus 16 Pinch roller 17 LF roller 18 Discharge roller 19 Platen 20 Fixing platen 23 Infrared sensor 24 Infrared sensor 25 Infrared sensor 31 Seed heater 32 Infrared reflector 50 Film drying devices 51, 54 Seed heaters 52, 55 Reflecting plate 53 Fixing device 61 Liquid composition applying device P Recording medium

Claims (9)

Applying ink to the recording medium using an inkjet recording head;
Drying the recording medium provided with the ink to obtain a semi-dry film of the ink;
Applying a liquid composition to at least a portion of the semi-dry film;
Drying the recording medium provided with the liquid composition;
An inkjet recording method comprising:
The ink contains a color material, a water-soluble solvent, resin particles, and water,
The liquid composition has 1,3-butanediol, an SP value of 17.4 (J / cm ³ ) ^1/2 or more and 23.8 (J / cm ³ ) ^1/2 or less, and at 20 ° C. An ethylene glycol ether having a vapor pressure of 8.0 Pa or more and 826.6 Pa or less, and an SP value of 17.4 (J / cm ³ ) ^1/2 or more and 23.8 (J / cm ³ ) ^1/2 or less And at least one solvent selected from the group consisting of diethylene glycol ethers having a vapor pressure at 20 ° C. of 8.0 Pa or more and 826.6 Pa or less,
The content of the solvent in the liquid composition is 30% by mass or more,
The content of water in the liquid composition is 20% by mass or less,
In the step of obtaining the semi-dry film, the recording medium to which the ink is applied until the amount of water contained in the semi-dry film becomes 10% by mass or less with respect to 100% by mass of the ink applied to the recording medium. An ink jet recording method which is a drying step. 2. The inkjet according to claim 1, wherein an SP value of the ethylene glycol ethers and the diethylene glycol ethers is 21.5 (J / cm ³ ) ^1/2 or more and 22.3 (J / cm ³ ) ^1/2 or less. Recording method.   The inkjet recording method according to claim 1 or 2, wherein a vapor pressure at 20 ° C of the ethylene glycol ethers and the diethylene glycol ethers is from 16.0 Pa to 24.0 Pa.   The inkjet recording method according to any one of claims 1 to 3, wherein the diethylene glycol ether is at least one of diethylene glycol monomethyl ether and diethylene glycol monoethyl ether.   The inkjet recording method according to any one of claims 1 to 4, wherein the ethylene glycol ethers are at least one of ethylene glycol monomethyl ether and ethylene glycol monoethyl ether. The inkjet according to any one of claims 1 to 5, wherein a Ka value for water obtained by measuring liquid absorbency by the Bristow method of the recording medium is 0.2 (ml / m ² · msec ^1/2 ) or less. Recording method.   The ink jet recording method according to claim 1, wherein the recording medium is a polyvinyl chloride film.   8. The ink jet recording method according to claim 1, wherein the resin of the resin particles is at least one selected from the group consisting of a styrene / acrylic polymer and polyurethane.   The ink jet recording method according to claim 1, wherein the liquid composition contains a water-soluble solvent.

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