JP3083065B2 - Inkjet recording method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording method, and more particularly, to an ink jet recording method capable of realizing an image having a plurality of resolutions with the same amount of ink per dot.

2. Description of the Related Art In order to increase the resolution of a printer, it is generally necessary to reduce the pitch of dots and to reduce the size of dots in accordance with the pitch. In the case of an ink jet printer that forms dots by spraying tiny ink droplets on a recording medium, techniques to reduce the size of the dots, such as reducing the diameter of the nozzles of the recording head and reducing the amount of ink ejected, are used Is done.

In a printer that realizes only a predetermined resolution, the nozzle diameter and the ink discharge amount may be set to optimum values.

[0004] However, the problem is complicated when multiple resolutions are to be realized with the same printer. That is,
If a mechanical attempt is made to reduce the nozzle diameter or reduce the ink discharge amount so as to be suitable for each of a plurality of resolutions, extremely complicated operations and high precision are required. Also, preparing a nozzle diameter suitable for each resolution in the print head complicates the mechanism of the print head.

[0005] Therefore, it can be said that there is a need for a method that can easily realize a plurality of resolutions in the same printer.

[0006]

SUMMARY OF THE INVENTION The present inventor can realize a plurality of resolution images with the same amount of ink per dot by using a specific recording paper in combination with an ink composition having specific characteristics. I got the knowledge. It is based on such findings according to the present invention.

[0007] That is, an object of the present invention is to provide an ink jet recording method which can be easily realized in a printer having a plurality of resolutions. The ink jet recording method according to the first aspect of the present invention is an ink jet recording method capable of printing at two or more resolutions, wherein the step of changing the resolution according to the selected recording medium, Forming ink dots by ejecting ink particles on a medium, wherein the amount of ink forming the ink particles is the same even if the resolution is changed. Selecting and using ink-permeable or ink-repellent inks such that the dot diameter formed on the recording medium falls within the range of 100 to 160% of the diagonal todd pitch in the resolution; It is. Further, an ink jet recording apparatus that performs the ink jet recording method according to the first aspect of the present invention is an ink jet recording apparatus capable of printing at two or more resolutions, and is capable of discharging ink droplets of a fixed ink amount. A print head, and means for changing a resolution corresponding to the selected recording medium, wherein a diameter of a dot formed on the recording medium by ink droplets is a pair of the recording medium. A material having ink permeability or ink repellency that is within the range of 100 to 160% of the todd pitch in the angular direction is selected and used. Further, in the ink jet recording method according to the second aspect of the present invention, the ink composition having a contact angle of 0 degree after 1 second to the sized recording paper and having a surface tension at room temperature of 20 to 35 mN / m is used. A recording medium (second recording medium) having a low-resolution, high-ink-repellent layer on the surface of a sized recording paper (first recording medium) is coated with the same amount of ink particles in the range of ~ 65 ng / dot. Medium) is printed at a high resolution. In addition, an ink jet recording apparatus that performs the ink jet recording method according to the second aspect of the present invention is an ink jet recording apparatus capable of performing both low-resolution and high-resolution printing.
A print head capable of ejecting the same amount of ink particles in the range of 5 ng / dot; and means for changing the resolution in accordance with the selected recording medium. The contact angle with the paper after 1 second is 0 degree, and the surface tension at room temperature is 20 to 35 m
N / m ink composition is used, and sized recording paper (first recording medium) for printing at low resolution
Is used by selecting a recording medium (second recording medium) having a layer with high ink repellency in the case of high resolution.

[0008]

DETAILED DESCRIPTION OF THE INVENTION In an ink jet recording method according to a first aspect of the present invention, ink particles are ejected onto a recording medium,
This method is common to a general inkjet recording method in that ink dots are formed on the recording medium. In the ink jet recording method according to the present invention, printing at a plurality of resolutions is performed using the same amount of ink particles. This change in resolution is performed according to the selected recording medium. When the resolution change is defined from the resolution side (that is, as a selection of a recording medium corresponding to the resolution), the diameter of a dot formed on the recording medium by the ink particles becomes smaller in a diagonal direction at the resolution. 100 to 160% of todd pitch, preferably 100 to 160%
A recording medium having ink permeability or ink repellency that falls within the range of 140%, more preferably 110 to 120%, is selected. The selection is qualitatively described as follows. That is, in the case of printing with low resolution, a recording medium having high ink permeability or low ink repellency is selected, and the spread of ink dots is increased to form ink dots having a large diameter. On the other hand, in the case of printing with high resolution, a recording medium having low ink permeability or high ink repellency is selected to form ink dots having a small diameter and a small diameter. In the present invention, the recording medium or the resolution is selected or changed based on whether or not the ink dot diameter falls within the range of 100 to 160% of the diagonal todd pitch at the resolution.

An apparatus for performing the ink jet recording method according to the first embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a preferred embodiment of the device. First, the print head 1 has nozzle ink (not shown),
While traveling in the axial direction (main scanning direction) of the platen 5 by the carriage 3, ink particles 11 are sprayed from ink nozzles onto the surface of the recording medium 7 on the platen 5 to form dots. Each time one main scan is completed, the platen 5
Rotates the recording medium 7 in the sub-scanning direction by a predetermined amount. By repeating the movement of the main scanning and the sub scanning,
A two-dimensional dot pattern can be drawn on the recording medium 7.

The pitch of the ink dots formed on the recording medium 7 is determined by the running speed of the print head 1, the ink ejection timing, and the amount of rotation of the platen 5 per rotation. These controls are performed by the controller 9. The controller 9 controls to realize a dot pitch corresponding to the resolution. Specifically, for example, when the low resolution is 360 dpi (dots / inch) and the high resolution is 720 dpi, the dot pitch in the main scanning direction and the sub-scanning direction is 1/36 of the respective resolution.
0 inch (about 70 μm) and 1/720 inch (about 3
5 μm).

The switching control of the dot pitch in the main scanning direction and the sub-scanning direction may be performed by a known method, for example, as disclosed in Japanese Patent Laid-Open No. 58-7374 and US Pat. No. 4,198,642. The described techniques may be employed.

In the recording apparatus according to the present invention, the dot pitch is switched according to the resolution as described above.
The ink amount of the ink droplets ejected from the head 1 is not changed. That is, the head 1 ejects the same amount of ink at any resolution.

In the present invention, although the ink amount of the ink particles ejected to the recording medium 7 is always the same,
The diameter of the ink dot formed above is changed depending on the resolution. This phenomenon will be described with reference to FIG. A in FIG.
This is the case where the resolution is 360 dpi. As shown in the figure, at this resolution, the todd pitch in the main scanning and sub-scanning directions is about 70 μm. Therefore, as shown in the figure, when the dots related to the diagonal positions are in contact with each other (that is, when there is no gap between the dots), the dot diameter is about 99.
μm. This is the ideal dot diameter. However, in consideration of the fluctuation of the dot pitch, a diameter larger than the ideal dot diameter is preferable in order to prevent a gap from occurring between the dots. Specifically, a size of 100 to 160% of the ideal dot diameter, that is, 100 μm
It is preferable that the thickness is in the range of about 160 μm from the viewpoint of realizing a good image. The same applies to the case of a resolution of 720 dpi as shown in FIG. That is, the dot pitch in the main scanning and sub-scanning directions is about 3
5 μm, and the dot pitch in the diagonal direction is about 49.5 μm.
m. However, in order to realize a good image, it is preferable that the size be 100 to 160% of the ideal dot diameter, that is, in the range of about 50 μm to 80 μm. The ink penetrability or ink repellency is such that the dot diameter formed on the recording medium by the above-mentioned ink particles of the same ink amount falls within the range of 100 to 160% of the diagonal todd pitch at the resolution. If a certain recording medium is selected and used for each resolution, printing at a plurality of resolutions can be performed while discharging the same amount of ink droplets onto the recording medium.

The ink jet recording method according to the first aspect of the present invention and the apparatus for carrying out the method are more preferred specific examples. The ink jet recording method according to the second aspect of the present invention and the apparatus for carrying out the method are preferred. It is. Hereinafter, the method and apparatus according to the second aspect will be described.

The sized recording paper (hereinafter sometimes referred to as “first recording medium”) used in the method according to the second aspect of the present invention imparts ink or water penetration resistance to the paper. It refers to the one that has been subjected to the process, generally referred to as “plain paper”.

Further, a recording medium having a highly ink-repellent layer on its surface (hereinafter, may be referred to as a “second recording medium”) used in the second embodiment of the present invention includes:
It refers to a recording medium having a layer having low affinity for ink, that is, a layer hardly wetted by ink, provided on the surface thereof. For example, it refers to a recording medium such as paper having a highly ink-repellent layer containing a water-soluble silicone compound and / or a water-soluble fluorine compound on its surface. Substances having low affinity for ink, such as these water-soluble silicone compounds and water-soluble fluorine compounds, may be carried on the surface of a recording medium such as paper by a binder. In some cases, this layer may include a silica-based white pigment.

Examples of the water-soluble silicone compound include a random mixture of a polyalkyl or polyallylsiloxane (eg, dimethylsiloxane, phenylsiloxane, etc.) and a high alcohol (eg, ethylene glycol, trimethylolpropane, pentaerythritol, sorbitol, etc.). A block or graft copolymer which is water-soluble is exemplified. Further, a water-soluble copolymer of a siloxane compound and hydroxymethacrylic acid is also a preferred example. The silicone compound may be in the form of a silicone emulsion, specifically, an emulsion in which silicon oil (polydimethylsiloxane having a siloxane skeleton (Si-O-Si)) is stably dispersed in water, or dimethylsiloxane. Examples include those obtained by monomer emulsion polymerization. Some of the methyl groups in these molecules may be substituted with epoxy groups, amino groups, reactive hydrogen, and the like.

Specific examples of the water-soluble fluorine compound include a random block or graft copolymer of a fluoroalkylpolysiloxane and a higher alcohol, which is water-soluble. The water-soluble fluorine compound may be in the form of a fluororesin emulsion, such as an emulsion in which fluorosilicone oil is stably dispersed in water.

As a specific example of the binder, PV
A, oxidized starch, etherified starch, other starch derivatives, gelatin, carboxymethyl cellulose, hydroxyethyl cellulose, other cellulose derivatives, polyvinylpyrrolidone and the like.

A preferred specific example of such a second recording medium is a recording medium described in JP-A-3-24908.

Further, a commercially available product can be used as the second recording medium.
Superfine papers and the like can be mentioned.

Further, the ink composition used in the present invention has a contact angle of 1 degree with a sized recording paper after 1 second and a surface tension of 20 to 3 at room temperature.
It is 5 mN / m, preferably 28 to 33 mN / m. The contact angle and surface tension of the ink composition are controlled by the composition of the ink composition. Specifically, it can be achieved by adjusting the types and amounts of a solvent, a surfactant, and a dispersant added to the ink composition described later.

The ink composition used in the present invention may be basically composed of a colorant, an organic solvent, and water.

Preferred examples of the colorant include direct dyes,
Acid dyes, food dyes, basic dyes, reactive dyes, disperse dyes, vat dyes, soluble vat dyes, reactive disperse dyes, and oil dyes can be used, and any of them can be used. Among them, C.I. I. Direct Red 2, 4, 9, 23, 26, 3
1, 39, 62, 63, 72, 75, 76, 79, 8
0, 81, 83, 84, 89, 92, 95, 111, 1
73, 184, 207, 211, 212, 214, 21
8, 221, 223, 224, 225, 226, 22
7,232,233,240,241,242,24
3, 247, C.I. I. Direct violet 7, 9,
47, 48, 51, 66, 90, 93, 94, 95, 9
8, 100, 101, C.I. I. Direct Yellow 8,
9, 11, 12, 27, 28, 29, 33, 35, 3,
9, 41, 44, 50, 53, 58, 59, 68, 8
6, 87, 93, 95, 96, 98, 100, 106,
108, 109, 110, 130, 132, 142, 1
44, 161, 163, C.I. I. Direct Blue 1,
10, 15, 22, 25, 55, 67, 68, 71, 7
6, 77, 78, 80, 84, 86, 87, 90, 9
8, 106, 108, 109, 151, 156, 15
8, 159, 160, 168, 189, 192, 19
3, 194, 199, 200, 201, 202, 20
3, 207, 211, 213, 214, 218, 22
5,229,236,237,244,248,24
9, 251, 252, 264, 270, 280, 28
8, 289, 291, C.I. I. Direct Black 9,
17, 19, 22, 32, 51, 56, 62, 69, 7
7, 80, 91, 94, 97, 108, 112, 11
3, 114, 117, 118, 121, 122, 12
5, 132, 146, 154, 166, 168, 17
3, 199, C.I. I. Acid Red 35, 42, 5
2, 57, 62, 80, 82, 111, 114, 11
8, 119, 127, 128, 131, 143, 15
1, 154, 158, 249, 254, 257, 26
1, 263, 266, 289, 299, 301, 30
5, 336, 337, 361, 396, 397, C.I.
I. Acid Violet 5, 34, 43, 47, 4
8, 90, 103, 126, C.I. I. Acid Yellow 17, 19, 23, 25, 39, 40, 42, 44, 4
9, 50, 61, 64, 76, 79, 110, 127,
135, 143, 151, 159, 169, 174, 1
90, 195, 196, 197, 199, 218, 21
9, 222, 227, C.I. I. Acid Blue 9, 2
5, 40, 41, 62, 72, 76, 78, 80, 8
2, 92, 106, 112, 113, 120, 127:
1, 129, 138, 143, 175, 181, 20
5, 207, 220, 221, 230, 232, 24
7, 258, 260, 264, 271, 277, 27
8, 279, 280, 288, 290, 326, C.I.
I. Acid Black 7, 24, 29, 48, 52:
1, 172, C.I. I. Reactive Red 3, 13, 1
7, 19, 21, 22, 23, 24, 29, 35, 3,
7, 40, 41, 43, 45, 49, 55, C.I. I. Reactive Violet 1, 3, 4, 5, 6, 7, 8,
9, 16, 17, 22, 23, 24, 26, 27, 3
3, 34, C.I. I. Reactive Yellow 2, 3, 1
3, 14, 15, 17, 18, 23, 24, 25, 2,
6, 27, 29, 35, 37, 41, 42, C.I. I. Reactive Blue 2, 3, 5, 8, 10, 13, 14,
15, 17, 18, 19, 21, 25, 26, 27, 2
8, 29, 38, C.I. I. Reactive Black 4,
5, 8, 14, 21, 23, 26, 31, 32, 34,
C. I. Basic Red 12, 13, 14, 15, 1
8, 22, 23, 24, 25, 27, 29, 35, 3,
6, 38, 39, 45, 46, C.I. I. Basic violet 1, 2, 3, 7, 10, 15, 16, 20, 2
1, 25, 27, 28, 35, 37, 39, 40, 4,
8, C.I. I. Basic Yellow 1, 2, 4, 11, 1
3, 14, 15, 19, 21, 23, 24, 25, 2,
8, 29, 32, 36, 39, 40, C.I. I. Basic Blue 1, 3, 5, 7, 9, 22, 26, 41, 4
5, 46, 47, 54, 57, 60, 62, 65, 6
6, 69, 71, C.I. I. Basic Black 8 and the like.

The amount of the dye is determined depending on the type of the dye, the type of the solvent component, the characteristics required for the ink, and the like.
The range is preferably from 15 to 15 wt%, more preferably from 0.5 to 10 wt%.

Preferred examples of the organic solvent include polyhydric alcohols having a high boiling point and low volatility such as glycerin, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, hexylene glycol, polyethylene glycol and polypropylene glycol. And N-methyl 2
-Pyrrolidone, 1,3-dimethylimidazolidinone, monoethanolamine, N, N-dimethylethanolamine, N, N-diethylethanolamine, diethanolamine, Nn-butyldiethanolamine, triisopropanolamine, triethanolamine, etc. A water-soluble organic solvent such as a nitrogen-containing organic solvent can be added within a range that does not cause bleeding of printing. Particularly, diethylene glycol, glycerin and the like are preferable. Further, according to a preferred embodiment of the present invention, it is preferable that the ink composition further contains benzotriazole from the viewpoint of stabilizing the physical properties of the ink.

Examples of preferred surfactants and penetrants include anionic surfactants, amphoteric surfactants, cationic surfactants, nonionic surfactants and the like. Alkyl sulfocarboxylates as anionic surfactants,
α-olefin sulfonate, polyoxyethylene alkyl ether acetate, N-acyl amino acid and its salt, N-acylmethyl taurine salt, alkyl sulfate polyoxyalkyl ether sulfate, alkyl sulfate polyoxyethylene alkyl ether phosphate , Rosin acid soap,
Castor oil sulfate, lauryl alcohol sulfate, alkyl phenol type phosphate, alkyl type phosphate, alkyl allyl sulfonate, diethyl sulfosuccinate, diethylhexyl sulfosuccinate dioctyl sulfosuccinate and the like. As the cationic surfactant, 2-vinylpyridine derivative, poly-4-
And vinyl pyridine derivatives. Examples of the amphoteric surfactant include betaine lauryl dimethylaminoacetate, 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, betaine coconut fatty acid amide propyldimethylaminoacetate, polyoctyl polyaminoethyl glycine, and other imidazoline derivatives. is there. Nonionic surfactants include polyoxyethylene nonyl phenyl ether, polyoxyethylene octyl phenyl ether, polyoxyethylene dodecyl phenyl ether, polyoxyethylene alkyl allyl ether, polyoxyethylene oleyl ether, polyoxyethylene lauryl ether, polyoxyethylene lauryl ether Ether type such as ethylene alkyl ether and polyoxyalkylene alkyl ether, polyoxyethylene oleic acid, polyoxyethylene oleate, polyoxyethylene distearate, sorbitan laurate, sorbitan monostearate, sorbitan monooleate, sorbitan sesquiate Esters such as oleate, polyoxyethylene monooleate and polyoxyethylene stearate; 9-tetramethyl-5-decyne -4,
7-diol, 3,6-dimethyl-4-octyne-3,
Acetylene glycols such as 6-diol and 3,5-dimethyl-1-hexyne-3ol (for example, Surfinol 104, 82, 465, TG, etc., manufactured by Nissin Chemical Co., Ltd.), fluorine-substituted alkyl esters, perfluoroalkyl carboxylic acids Fluorinated surfactants such as acid salts (for example,
Neogent Inc.'s Futuregent series, Ciba Geigy's Rodyne series, Dupont's Zonil series, ICI's Montfloor series, Asahi Glass's Surflon series, Daikin Industries' Unidyne series, or Sumitomo 3M's FC series)
And the like. In particular, the use of fluorosurfactants, especially amphoteric or nonionic surfactants, is preferred.
The addition amount of the surfactant may be determined as appropriate, but in the case of a fluorine-based surfactant, it is preferably about 1 to 10,000 ppm.

In the ink jet recording method according to the second aspect of the present invention, recording is performed on the first recording medium and the second recording medium at different resolutions. In particular,
Recording is performed on the first recording medium at a low resolution and on the second recording medium at a high resolution. In that case, the ink amount per dot may be the same in the range of 5 to 65 ng for any recording medium. According to a preferred embodiment, the ink amount per dot is preferably in the range of 30 to 50 ng. In the method according to the present invention, the resolution is changed corresponding to the above-mentioned specific recording medium, but printing is performed with the same ink amount. The resulting print is of high quality with no blur at any resolution.

According to a preferred embodiment of the present invention, the resolution is set to 400 dpi when printing on the first recording medium.
In the case where printing is performed on the second recording medium, it is preferable to exceed 400 dpi, but it is not limited thereto. 360 dpi and 720 dpi, 7
A combination such as 20 dpi and 1440 dpi may be used.

The formation of ink dots in the recording method according to the second embodiment of the present invention will be described with reference to FIG. The ink droplets 31 discharged to the first recording medium are
, An ink dot 33 slightly larger than the size of the ink particle 31 is formed. This is because the first recording medium is easily wetted by the ink composition, that is, the first recording medium is ink-permeable. On the other hand, the ink particles 31 ejected to the second recording medium 34 first adhere to the highly ink-repellent layer 35 provided on the surface of the second recording medium 34. Due to the high ink repellency of the layer 35, the ink particles 31 are absorbed without spreading much on the recording medium 34, and are further absorbed by the base material 3 such as paper.
To 6. As described above, according to the method of the present invention, ink dots of different diameters can be formed by ink droplets of the same amount of ink. It can be realized by.

An apparatus for executing the recording method according to the second aspect of the present invention basically has the configuration shown in FIG. In this apparatus, the print head 1 is configured to be able to eject the same amount of ink particles in the range of 5 to 65 ng / dot.

[0032]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. Preparation of Ink Compositions Black (B), yellow (Y), and yellow inks described in Examples 1 to 3 and Comparative Examples 1 and 2 described in Tables 1 and 2 below.
Each of the magenta (M) and cyan (C) ink compositions was prepared by mixing the components shown in the table, heating and stirring.

[0033]

[Table 1]

[0034]

[Table 2] Printing Test An inkjet printer MJ-700V was prepared using a combination of the inks of Examples 1 to 3 and Comparative Examples 1 and 2.
A color image was printed by 2C (manufactured by Seiko Epson Corporation). Color image is Japan Standard Associa
tion SCID pattern.

The printer was modified so that the ink ejection amount could be changed, and printing was performed based on the ink ejection amount per nozzle and the resolution described in the table. In the table, recording paper A is plain paper XeroxP paper, and recording paper B is Eps.
On Super Fine paper. The obtained print was visually evaluated according to the following criteria. -Good image with no bleeding-excellent (◎)-Good image with almost no bleeding-good (○)-Slightly observed bleeding-Slightly poor (△)-Many bleeding observed -Poor (x) The results were as shown in the following table.

[0036]

[Table 3]

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a main part of an ink jet recording apparatus according to the present invention.

FIG. 2 is a diagram showing a relationship between resolution and dot pitch.

FIG. 3 is a diagram illustrating formation of ink dots on a recording medium. FIG. 3A illustrates the formation of ink dots on a sized recording sheet, and FIG. 3B illustrates the formation of ink dots on a recording medium having an ink-repellent layer.

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Hiroaki Tojo 3-5-5 Yamato, Suwa-shi, Nagano Seiko Epson Corporation (56) References JP-A-5-169790 (JP, A) JP-A-5-230408 (JP, A) JP-A-6-143795 (JP, A) JP-A-58-7374 (JP, A) JP-A-3-221456 (JP, A) JP-A-5-104726 ( JP, A) JP-A-8-72236 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B41M 5/00 B41J 2/01

Claims (5)

(57) [Claims] 1. An ink jet recording method capable of printing at two or more resolutions, the method comprising: changing a resolution in accordance with a selected recording medium;
Forming ink dots by ejecting ink particles on the recording medium, wherein the amount of ink forming the ink particles is the same even if the resolution is changed, and The dot diameter formed on the recording medium by the ink particles is 100 to 16 of the diagonal todd pitch at the resolution.
An ink jet recording method in which a material having ink permeability or ink repellency falling within a range of 0% is selected and used. 2. An ink jet recording apparatus capable of printing at two or more resolutions, wherein a print head capable of ejecting ink droplets of a fixed amount of ink and a resolution corresponding to a selected recording medium are changed. Wherein a diameter of a dot formed on the recording medium by ink particles falls within a range of 100 to 160% of a diagonal todd pitch in the resolution of the recording medium. An ink jet recording apparatus which selects and uses a material having ink permeability or ink repellency. 3. A contact angle with the sized recording paper after 1 second is 0 degree, and the surface tension at room temperature is 20 degrees.
Recording having an ink composition of about 35 mN / m, the same amount of ink particles in the range of 5 to 65 ng / dot, and having a low resolution and high ink repellency layer on the surface of the sized recording paper. An ink jet recording method, comprising a step of printing at a high resolution on a medium. 4. The printing performed on the sized recording paper is 400 dpi or less, and the printing performed on the recording paper having the ink absorbing layer having high ink repellency is 400 dpi.
4. The ink jet recording method according to claim 3, wherein the value exceeds pi. 5. An ink jet recording apparatus capable of performing both low-resolution and high-resolution printing, comprising: a print head capable of discharging the same amount of ink particles in a range of 5 to 65 ng / dot; Means for changing the resolution correspondingly, wherein the ink composition has a contact angle of 1 degree with the sized recording paper after 1 second and a surface tension at room temperature of 20 to 35 mN / m. An ink jet recording apparatus, wherein an ink composition of m is used, and a sized recording paper is used for printing at low resolution, and a recording medium having a high ink repellent layer on its surface is selected for high resolution. .