JP2015134460A - Recording device, and recording method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording device or the like capable of suppressing the nozzle jamming of an ink ejection part.SOLUTION: A recording device comprises: a feed part 2 for feeding a roll sheet P; a reaction liquid application part 3 for applying a reaction liquid to react with ink, to a recording medium; and an ink discharge part 4 disposed on the downstream side of the reaction liquid application part 3 on the feed path of the roll sheet P, for discharging the ink from a nozzle to the roll sheet P. The recording device comprises, between the reaction liquid application part 3 and the ink discharge part 4 in the feed path: neither a heating part for heating the roll paper P nor a ventilation part for ventilating the recording medium.

Description

  The present invention relates to a recording apparatus and a recording method for performing recording by ejecting ink onto a recording medium.

  Conventionally, a recording medium conveying unit that conveys a recording medium, a processing liquid applying unit that applies a processing liquid that agglomerates color materials in ink to the recording medium, and a downstream side of the processing liquid applying unit in the recording medium conveying path A process that is provided between an ink droplet ejection unit that ejects ink onto a recording medium, and a treatment liquid application unit and an ink droplet ejection unit in the transport path, and dries the solvent in the treatment liquid with infrared rays and drying air. An ink jet recording apparatus including a liquid drying unit is known (see Patent Document 1).

JP 2009-196309 A

  In the conventional ink jet recording apparatus, the ink in the ink droplet ejection section is easily dried by the infrared rays and the drying air from the processing liquid drying section, and nozzle clogging is likely to occur.

  It is an object of the present invention to provide a recording apparatus and a recording method that can suppress nozzle clogging in an ink discharge portion.

  The recording apparatus of the present invention includes a feeding unit that feeds a recording medium, a reaction liquid applying unit that applies a reaction liquid that reacts with ink to the recording medium, and a downstream side of the reaction liquid applying unit in the feeding path of the recording medium. An ink discharge unit that discharges ink from the nozzles to the recording medium, and a heating unit that heats the recording medium between the reaction liquid application unit and the ink discharge unit in the feed path, and a wind to the recording medium None of the blowing section to be sent is provided.

  The recording method of the present invention includes a feeding unit that feeds a recording medium, a reaction liquid applying unit that applies a reaction liquid that reacts with ink to the recording medium, and a downstream side of the reaction liquid applying unit in the recording medium feeding path. In a recording apparatus comprising: an ink ejection unit that ejects ink from a nozzle onto a recording medium; the recording medium is not heated between the reaction liquid application unit and the ink ejection unit in the feed path; It is characterized by not sending wind.

According to this configuration, since neither the heating unit nor the air blowing unit is provided between the reaction liquid applying unit and the ink discharge unit in the feed path, the ink in the ink discharge unit can be dried by heat or wind. It is suppressed. Therefore, nozzle clogging in the ink discharge portion can be suppressed.
The recording medium is not particularly limited. For example, the recording medium may be a long sheet such as roll paper, or may be a cut sheet. The material of the recording medium is not particularly limited, and various materials such as paper and film can be used.
Although the aspect which a reaction liquid application part apply | coats with a reaction liquid is not specifically limited, For example, the aspect which discharges a reaction liquid by an inkjet system etc. may be sufficient, and it is the aspect which sprays a reaction liquid by spray etc. The reaction liquid may be applied by a roll coater or the like.
Although the aspect in which the ink discharge part discharges ink is not specifically limited, For example, an inkjet system can be used.
The reaction liquid is not particularly limited as long as it reacts with the ink. For example, when the ink includes a dispersion such as a pigment or a resin, the reaction liquid includes a flocculant that aggregates the dispersion. Can be used.

In the recording apparatus, it is preferable that the reaction liquid application unit applies the reaction liquid to the recording medium such that the application amount of the reaction liquid per unit area with respect to the recording medium is 1.2 mg / inch ² or less.

When the amount of reaction liquid applied per unit area to the recording medium by the reaction liquid application unit is large, both the heating unit and the air blowing unit are provided between the reaction liquid application unit and the ink discharge unit in the feed path. Therefore, ink is ejected by the ink ejection unit in a state where much moisture remains on the recording medium.
In this regard, according to the present configuration, the amount of the reaction liquid applied to the recording medium per unit area is 1.2 mg / inch ² or less, so that the ink is ejected in a state where much moisture remains on the recording medium. Can be suppressed.

  In this case, the ink discharge section discharges the ink in which the dispersion is dispersed in a solvent to the recording medium, and the reaction liquid application section contains a flocculant that aggregates the dispersion as the reaction liquid. It is preferable to apply to a recording medium.

  According to this configuration, the dispersions in the ink are aggregated by the aggregating agent in the reaction liquid. Thereby, the viscosity of the ink discharged to the recording medium is increased, and the fixability of the ink to the recording medium can be improved.

In this case, the reaction liquid application section has a reaction liquid discharge section that discharges droplets of the reaction liquid, and the reaction liquid discharge section has a dot density of the reaction liquid with respect to the recording medium of 144000 dots / inch ² or more. In addition, it is preferable to discharge the reaction liquid onto the recording medium.

According to this configuration, by setting the dot density of the reaction liquid with respect to the recording medium to 144000 dots / inch ² or more, a considerable amount of the ink ejected to the recording medium can be reacted with the reaction liquid.

  In this case, it is preferable to further include a control unit that controls the amount of reaction liquid applied per unit area to the recording medium by the reaction liquid application unit.

According to this configuration, an appropriate amount of the reaction liquid can be applied to the recording medium.
In addition, as an aspect in which the control unit controls the application amount of the reaction liquid, for example, when the reaction liquid application unit has a reaction liquid discharge unit that discharges the reaction liquid, the reaction liquid is changed by changing the discharge duty ratio. The amount of the reaction liquid applied may be controlled, and the amount of the reaction liquid applied may be controlled by changing the weight of the droplet of the reaction liquid.

  In this case, the feeding unit has a rotating drum that is driven and rotated by the recording medium to be fed, the reaction liquid applying unit has a reaction liquid discharging unit that discharges the reaction liquid, and the ink discharging units have different colors. It is preferable that a plurality of color-specific ejection units for ejecting the ink are provided, and the reaction liquid ejection unit and the plurality of color-specific ejection units are respectively provided radially with respect to the rotation center of the rotary drum.

1 is a configuration diagram of a recording apparatus according to an embodiment of the present invention. It is a perspective view around a rotating drum. It is a figure which shows an ink dot, Comprising: (a) is the case where the reaction liquid application amount exceeds 1.2 mg / inch ² and (b) is the case where the reaction liquid application amount is 1.2 mg / inch ² or less. . It is a block diagram of the recording device which concerns on other embodiment of this invention. It is a block diagram of a recording apparatus different from the present invention. It is a table | surface which shows the result of Examples 1-5. It is a table | surface which shows the result of Examples 6-10. It is a table | surface which shows the result of Examples 11-13 and Comparative Examples 1-2.

  Hereinafter, a recording apparatus according to an embodiment of the present invention will be described with reference to the accompanying drawings. The recording apparatus of the present embodiment discharges a reaction liquid that reacts with ink onto a recording medium that is roll paper, discharges ink thereon, forms a recorded image, and creates a label or the like. . The material of the roll paper is not particularly limited, and various materials such as paper and film can be used.

  As shown in FIGS. 1 and 2, the recording apparatus 1 of the present embodiment includes a feeding unit 2 that feeds the roll paper P, and a reaction liquid application unit 3 that is provided in order from the upstream side in the feeding path of the roll paper P. Ink discharge unit 4 and drying unit 5 are provided. Although not shown, the recording apparatus 1 includes a control unit that performs overall control of these units.

  The feeding unit 2 feeds the roll paper P by a roll-to-roll method. The feeding unit 2 includes a feeding reel 7 and a take-up reel 8, a rotating drum 9 provided substantially in the middle of the feeding path, and a plurality of rollers provided in the feeding path.

  As the plurality of rollers, there are an upstream feed roller 11, an upstream guide roller 12, a downstream guide roller 13, a downstream feed roller 14, a first folding roller 15 and a second folding roller 16 in order from the upstream side in the feeding path. Is provided. By rotating the feeding reel 7, the upstream feeding roller 11, the downstream feeding roller 14 and the take-up reel 8, the roll paper P is fed from the feeding reel 7 and fed along the peripheral surface of the rotating drum 9. After that, it is taken up on the take-up reel 8. The first folding roller 15-and the second folding roller 16 are provided in the drying unit 5.

  The rotary drum 9 is a cylindrical drum that is rotatably supported by a support mechanism (not shown). The rotating drum 9 supports the roll paper P on the outer peripheral surface. When the roll paper P is fed along the outer peripheral surface, the rotary drum 9 is driven to rotate by the frictional force between the outer peripheral surface and the roll paper P.

  The ink ejection unit 4 includes a plurality of color-specific ejection units 17 that eject inks of different colors. The ink discharge unit 4 is, in order from the upstream side in the feed path, a first color-specific discharge unit 17a that discharges white ink, a second color-specific discharge unit 17b that discharges black ink, and a third color that discharges cyan ink. A separate discharge portion 17c, a fourth color discharge portion 17d that discharges magenta ink, a fifth color discharge portion 17e that discharges yellow ink, and a sixth color discharge portion 17f that discharges an overcoat liquid. ing. Hereinafter, cyan ink, magenta ink, and yellow ink are collectively referred to as “color ink”. The first color-by-color discharge unit 17 a to the sixth color-by-color discharge unit 17 f are provided radially with respect to the rotation center of the rotary drum 9 together with a reaction liquid discharge unit 18 to be described later.

The white ink, the black ink, and the three color inks are all pigment inks in which a pigment as a coloring material is dispersed in a solvent. The overcoat liquid is a transparent ink that does not contain a pigment and in which a resin is dispersed in a solvent.
The color of ink ejected by the plurality of color-specific ejection units 17 is not particularly limited, and other color inks may be used, and the number of ink colors is arbitrary.

  Each color discharge unit 17 discharges ink by an ink jet method. Each color discharge unit 17 has a plurality of discharge nozzles (not shown) arranged corresponding to the width of the rotary drum 9. That is, each color discharge unit 17 is a line type. In addition, each color discharge unit 17 may be configured by arranging a plurality of inkjet heads, or may be configured by a single inkjet head.

  The recording apparatus 1 selectively executes a first recording mode in which a recording image is directly formed on the roll paper P and a second recording mode in which a base image is formed on the roll paper P and then a recording image is formed. Is possible. In the first recording mode, the first color-specific ejection unit 17a does not eject white ink, and the second color-specific ejection unit 17b to the fifth color-specific ejection unit 17e eject black ink and color ink, thereby recording images. Form. In the second recording mode, the first color-specific ejection unit 17a ejects white ink onto the entire surface of the roll paper P to form a white background, and the second color-specific ejection unit 17b is formed on the formed background. To the fifth color-specific ejection section 17e eject black ink and color ink to form a recorded image. The first recording mode is executed, for example, when the roll paper P is made of a paper material, and the second recording mode is executed, for example, when the roll paper P is made of a transparent film material. .

  Furthermore, in both the first recording mode and the second recording mode, the sixth color-specific ejection unit 17f appropriately ejects an overcoat liquid on the ground or the recorded image to form a transparent resin film. Thereby, durability of a groundwork or a recorded image can be improved.

In the second recording mode, compared to the first recording mode, the maximum amount of ink discharged per unit area with respect to the roll paper P by the ink discharge unit 4 (hereinafter also referred to as “ink maximum discharge amount”) by the amount of white ink discharged. Will increase. The maximum ink discharge amount in the first recording mode is, for example, 5 to 10 mg / inch ² , and the maximum ink discharge amount in the second recording mode is, for example, 15 to 20 mg / inch ² . The maximum ink discharge amount varies depending on the resolution, the weight of ink droplets, the number of ink colors, and the maximum dot density of each color ink.

  The reaction liquid application unit 3 includes a reaction liquid discharge unit 18 that discharges the reaction liquid onto the roll paper P. The reaction liquid discharge unit 18 discharges the reaction liquid by an ink jet method, and is configured in the same manner as each of the color discharge units 17 described above.

  The reaction solution is obtained by dissolving a flocculant in a solvent. The aggregating agent agglomerates a dispersion such as a pigment or a resin dispersed in the ink. That is, when ink is ejected onto the roll paper P from which the reaction liquid has been ejected, the coulomb repulsion between the dispersions in the ink is neutralized by the aggregating agent in the reaction liquid, and the dispersions aggregate together. . Thereby, the viscosity of the ink discharged onto the roll paper P is increased, and the fixability of the ink to the roll paper P is improved.

  The solvent for the reaction solution is preferably water, and in addition to water, a water-soluble organic solvent such as a polyhydric alcohol or a polyhydric alcohol derivative may be added.

  As the flocculant, for example, a metal salt is preferable, and among them, a polyvalent metal salt is preferable from the viewpoint of cohesive strength. As the polyvalent metal salt, for example, one or more of calcium nitrate, calcium chloride, magnesium chloride, calcium acetate, magnesium acetate and calcium formate can be suitably used.

The concentration of the flocculant in the reaction solution is not particularly limited, but is preferably 1 × 10 ⁻⁷ mol / mg or more and 1 × 10 ⁻⁶ mol / mg or less, preferably 3 × 10 ⁻⁷ mol / mg. It is more preferable that the concentration is from mg to 8 × 10 ⁻⁷ mol / mg.

The amount of reaction liquid applied to the roll paper P by the reaction liquid discharge unit 18 per unit area (hereinafter also referred to as “reaction liquid application amount”) is preferably 1.2 mg / inch ² or less, preferably 0.5 mg. / Inch ² or less is more preferable. The recording apparatus 1 does not include any of a heating unit that heats the roll paper P and a blowing unit that sends air to the recording medium between the reaction liquid application unit 3 and the ink discharge unit 4 in the feeding path. Thus, when the reaction liquid application amount is large, ink is ejected by the ink ejection unit 4 in a state where a large amount of moisture remains on the roll paper P. On the other hand, when the applied amount of the reaction liquid is 1.2 mg / inch ² or less, it is possible to prevent ink from being ejected in a state where much moisture remains on the recording medium.

More specifically, when the reaction liquid application amount exceeds 1.2 mg / inch ² , the dot diameter a of the ink dots D formed on the roll paper P becomes small (for example, 25 μm), and the ink for the roll paper P is reduced. Dot D is poorly filled (see FIG. 3A). This is presumably because the dispersion in the ink was excessively agglomerated due to the ink being ejected by the ink ejection part 4 while a large amount of moisture remained on the roll paper P. On the other hand, if the reaction liquid application amount is 1.2 mg / inch ² or less, the dot diameter a of the ink dots D on the roll paper P becomes an appropriate size (for example, 50 to 60 μm), and the ink dots on the roll paper P The filling of D becomes good (see FIG. 3B).

On the other hand, the application amount of the reaction liquid is preferably not less than the required application amount (mg / inch ² ) given by the following formula.
(Necessary application amount) = (necessary cation amount) × (maximum ink ejection amount) / ((cation concentration) × (cation valence)))
Necessary cation amount: The amount of cation derived from the flocculant necessary for the unit weight of the ink (mol / mg). When the ink ejection unit 4 ejects ink of a plurality of colors, the maximum value among the necessary cation amounts of each color, that is, the necessary cation amount of the least reactive ink is used.
Maximum ink discharge amount: Maximum ink discharge amount per unit area with respect to the roll paper P by the ink discharge unit 4 (mg / inch ² )
Cation concentration: concentration of cation derived from flocculant in reaction solution (mol / mg)
Cation valence: valence of the cation derived from the flocculant Here, the cation derived from the flocculant is described as aggregating the dispersion, but is not limited to the cation, and may be an anion. .

  If the reaction liquid application amount is equal to or greater than the necessary application amount, a considerable amount of the dispersion in the ink discharged onto the roll paper P reacts with the flocculant. Therefore, it is possible to suppress the ink from flowing and to suppress the deterioration of the image quality.

Moreover, the reaction liquid discharge part 18 is drive-controlled by the control part. The controller controls the reaction liquid application amount by changing the discharge duty ratio. For example, when the reaction liquid droplet weight by the reaction liquid discharge unit 18 is 3 ng and the reaction liquid discharge resolution by the reaction liquid discharge unit 18 is 1200 × 1200 dpi, the discharge duty ratio is set to 10%. The reaction liquid dot density is 144000 dots / inch ² and the reaction liquid application amount is 0.432 mg / inch ² . Further, when the discharge duty ratio is set to 100% under the same conditions, the reaction liquid dot density is 1440000 dots / inch ² and the reaction liquid application amount is 4.32 mg / inch ² .
The control unit may control the applied voltage to the reaction liquid discharge unit 18 to change the weight of the reaction liquid droplets by the reaction liquid discharge unit 18 to control the reaction liquid application amount. .

It is preferable that the reaction liquid discharge unit 18 discharges the reaction liquid onto the roll paper P such that the reaction liquid dot density is 144000 dots / inch ² or more. If the reaction liquid dot density is 144000 dots / inch ² or more, a considerable amount of the dispersion in the ink discharged onto the roll paper P reacts with the flocculant. Therefore, it is possible to suppress the ink from flowing and to suppress the deterioration of the image quality.

The drying unit 5 includes a drying unit fan 21 and a drying unit heater 22. The drying unit 5 dries the roll paper P by sending hot air to the roll paper P on which the reaction liquid and the ink are discharged, substantially parallel to the recording surface of the roll paper P. As a result, the ink is completely fixed on the roll paper P. In the drying unit 5, the feeding path of the roll paper P is folded by the first folding roller 15 and the second folding roller 16. For this reason, hot air can be efficiently applied to the roll paper P without providing a wide space for the drying unit 5.
The drying unit 5 may dry the roll paper P by sending wind at room temperature only by the drying unit fan 21, and the roll paper P is heated by heating only the drying unit heater 22. It may be dried.

  In the recording apparatus 1 configured as described above, the reaction liquid application unit 3 reacts to the roll paper P that is sent along the peripheral surface of the rotating drum 9 while the feeding unit 2 feeds the roll paper P. A liquid is applied, and the ink ejection unit 4 ejects ink thereon. The ink ejected onto the roll paper P is thickened by the dispersion in the ink being agglomerated by the aggregating agent in the reaction liquid, and fixing to the roll paper P is promoted. Further, the roll paper P is sent to the drying unit 5, and the drying unit 5 dries the roll paper P, so that the ink is completely fixed on the roll paper P.

  In the present embodiment, the example in which the present invention is applied to the drum transport type recording apparatus 1 has been described. However, the present invention is not limited to this, and the flat transport type recording apparatus 100 as shown in FIG. It can also be applied to. The recording apparatus 100 according to this modified example includes a feed unit 102 that feeds the roll paper P from the supply reel 107 through the platen 109 to the take-up reel 108, and a reaction liquid provided in order from the upstream side in the feed path of the roll paper P. An application unit 103, an ink discharge unit 104, and a drying unit 105 are provided. The recording apparatus 100 also includes neither a heating unit that heats the roll paper P nor an air blowing unit that sends air to the recording medium between the reaction liquid applying unit 103 and the ink discharge unit 104 in the feeding path. Is.

  On the other hand, FIG. 5 shows a recording apparatus 200 different from the present invention. The recording apparatus 200 illustrated in FIG. 5 is configured in substantially the same manner as the recording apparatus 1 illustrated in FIG. 1, but between the reaction liquid application unit 3 and the ink ejection unit 4 in the feed path of the roll paper P, The difference is that a vaporization promoting unit 6 is provided. The vaporization promotion unit 6 sends hot air to the roll paper P to which the reaction liquid is applied by the reaction liquid application unit 3 to dry the roll paper P. The vaporization promoting unit 6 includes a promoting unit fan 24 and a promoting unit heater 25, and sends hot air to the roll paper P.

  Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples.

[Example 1]
Under the following conditions, continuous recording was performed on roll paper for 10 minutes.
-Device used: recording device shown in Fig. 1-Recording mode: first recording mode-Flocculant: calcium nitrate (cation valence: 2)
Cation concentration: 3 × 10 ⁻⁷ mol / mg
・ Reaction liquid discharge resolution: 1200 × 1200 dpi
・ Reaction liquid droplet weight: 3 ng
・ Reaction liquid discharge duty ratio: 10%

Here, the inks used in the first printing mode are black ink, cyan ink, magenta ink, yellow ink, and overcoat liquid, and the maximum ink discharge amount is 7.2 mg / inch ² .
For the ink used, the value of the necessary cation amount was determined in advance by experiment and found to be 2.63 × 10 ⁻⁸ mol / mg. There was no difference in the amount of necessary cation between the inks of the respective colors.
Based on the above conditions, the required application amount is calculated as 0.32 mg / inch ² .
From the above conditions, the reaction liquid dot density is calculated to be 144000 dots / inch ² , and the reaction liquid application amount is calculated to be 0.432 mg / inch ² .

[Example 2]
Recording was performed in the same manner as in Example 1 except that, of the above conditions, the cation concentration was 8 × 10 ⁻⁷ mol / mg.

[Example 3]
Among the above conditions, recording was performed in the same manner as in Example 1 except that the printing mode was the second printing mode and the discharge duty ratio of the reaction liquid was set to 20%.
Here, the inks used in the second printing mode are white ink, black ink, cyan ink, magenta ink, yellow ink, and overcoat liquid, and the maximum ink discharge amount is 18 mg / inch ² .
For the white ink, the necessary cation amount was 2.63 × 10 ⁻⁸ mol / mg.

[Example 4]
Recording was performed in the same manner as in Example 1 except that, of the above conditions, the printing mode was changed to the second printing mode.

[Example 5]
Of the above conditions, recording was performed in the same manner as in Example 1 except that the weight of the droplet of the reaction solution was 2 ng and the discharge duty ratio of the reaction solution was 15%.

[Example 6]
Of the above conditions, recording was performed in the same manner as in Example 1, except that the reaction solution discharge resolution was 2400 × 2400 dpi, the reaction liquid droplet weight was 1 ng, and the reaction solution discharge duty ratio was 15%. Went.

[Example 7]
Recording was performed in the same manner as in Example 1 except that, among the above conditions, the discharge duty ratio of the reaction solution was 28%.

[Example 8]
Recording was performed in the same manner as in Example 1 except that the cation concentration was 8 × 10 ⁻⁷ mol / mg and the discharge duty ratio of the reaction solution was 28%.

[Example 9]
Recording was performed in the same manner as in Example 1 except that, among the above conditions, the discharge duty ratio of the reaction solution was set to 30%.

[Example 10]
Of the above conditions, recording was performed in the same manner as in Example 1 except that the cation concentration was 8 × 10 ⁻⁷ mol / mg and the discharge duty ratio of the reaction solution was 30%.

[Example 11]
Recording was performed in the same manner as in Example 1 except that, among the above conditions, the discharge duty ratio of the reaction solution was 40%.

[Example 12]
Recording was performed in the same manner as in Example 1 except that, among the above conditions, the discharge duty ratio of the reaction liquid was 9%.

[Example 13]
Recording was performed in the same manner as in Example 1 except that calcium acetate was used as a flocculant among the above conditions.

[Comparative Example 1]
Of the above conditions, recording was performed in the same manner as in Example 1 except that the recording apparatus shown in FIG. 5 was used.

[Comparative Example 2]
Of the above conditions, recording was performed in the same manner as in Example 1 except that the recording apparatus shown in FIG. 5 was used and the discharge duty ratio of the reaction liquid was set to 100%.

  The recorded images formed in Examples 1 to 13 and Comparative Examples 1 and 2 were visually evaluated for the presence or absence of missing dots, the degree of ink dot filling in the roll paper, and the ink fixability on the roll paper. Ink fixability is evaluated by the degree of ink bleeding. The results are shown in FIGS. In addition, an evaluation result is shown in three steps of 3, 2, 1 in an order from the highest. If the evaluation result is 2 or more, there is no problem.

  In each of Examples 1 to 13 using the recording apparatus illustrated in FIG. 1, the dot missing evaluation was “3”. As a result, the recording apparatus does not include either the heating unit or the air blowing unit between the reaction liquid application unit and the ink discharge unit in the feed path, so that the ink in the ink discharge unit is dried by heat or wind. As a result, it was shown that nozzle clogging in the ink discharge portion can be suppressed.

In Examples 1 to 8 and 12 to 13 in which the reaction solution application amount was 1.2 mg / inch ² or less, the evaluation of dot embedding was “2” or “3”. From this fact, by setting the applied amount of the reaction liquid to 1.2 mg / inch ² or less, it is possible to prevent ink from being ejected in a state where a large amount of moisture remains on the roll paper. It was shown that the filling was good. Furthermore, in Examples 1-2, 4-5, and 12-13, in which the reaction solution application amount was 0.5 mg / inch ² or less, the evaluation of dot filling was “3” in all cases.

Further, in Examples 1 to 11 and 13 in which the dot density of the reaction liquid is 144000 dots / inch ² or more, all of the ink fixability is “3” except for Example 4 in which the reaction liquid application amount is lower than the required application amount. Met. Accordingly, by setting the dot density of the reaction liquid to 144000 dots / inch ² or more, a considerable amount of the ink discharged onto the roll paper can be reacted with the reaction liquid, and the ink fixing property is improved. It was shown that.

  1: recording device, 2: feeding unit, 3: reaction liquid application unit, 4: ink ejection unit, P: roll paper

Claims (7)

A feeding section for sending a recording medium;
A reaction liquid application unit that applies a reaction liquid that reacts with ink to the recording medium;
An ink ejection unit that is provided on the downstream side of the reaction liquid application unit in the feeding path of the recording medium and that ejects the ink from a nozzle to the recording medium;
Neither a heating unit that heats the recording medium nor an air blowing unit that sends air to the recording medium is provided between the reaction liquid application unit and the ink discharge unit in the feeding path. Recording device. The reaction liquid application unit applies the reaction liquid to the recording medium such that an application amount of the reaction liquid per unit area with respect to the recording medium is 1.2 mg / inch ² or less. The recording apparatus according to claim 1. The ink discharge unit discharges, as the ink, a dispersion dispersed in a solvent onto the recording medium,
The recording apparatus according to claim 2, wherein the reaction liquid application unit applies, as the reaction liquid, a liquid containing an aggregating agent that aggregates the dispersion to the recording medium. The reaction liquid application unit includes a reaction liquid discharge unit that discharges droplets of the reaction liquid,
The said reaction liquid discharge part discharges the said reaction liquid to the said recording medium so that the dot density of the said reaction liquid with respect to the said recording medium may be 144000 dots / inch < ² > or more. The recording device described.   The recording apparatus according to claim 1, further comprising a control unit that controls an amount of the reaction liquid applied per unit area to the recording medium by the reaction liquid application unit. . The feeding unit includes a rotating drum that is driven to rotate by the recording medium to be fed,
The reaction liquid application part has a reaction liquid discharge part for discharging the reaction liquid,
The ink ejection unit has a plurality of color-specific ejection units that eject the inks of different colors,
The said reaction liquid discharge part and the said several discharge part according to color are each provided radially with respect to the rotation center of the said rotating drum, The Claim 1 thru | or 5 characterized by the above-mentioned. Recording device. A feeding section for sending a recording medium;
A reaction liquid application unit that applies a reaction liquid that reacts with ink to the recording medium;
In a recording apparatus comprising: an ink ejection unit that is provided downstream of the reaction liquid application unit in the recording medium feeding path and that ejects the ink from a nozzle to the recording medium.
A recording method, wherein the recording medium is not heated and air is not sent to the recording medium between the reaction liquid application unit and the ink discharge unit in the feeding path.

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