JPH07242052A - Recording paper and ink jet recording method and device using the same - Google Patents

Abstract

PURPOSE:To obtain a highly detailed image high in density by using recording paper having the exposed parts of pulp fibers and the parts covered with the particles of pulp fibers coexisting on the surface thereof and characterized by that a time is shorter than the min. adjacent dot driving time interval of droplets of ink having two kinds of absorption coefficients, the deflection points of which are different, satisfying formula in a Bristol test. CONSTITUTION:Recording paper is based on chemical pulp, a size agent and a filter and contains other papermaking auxiliary agents if necessary and is produced by applying an aq. coating soln. containing pigment, a resin and other additives to recording raw paper produced by a usual papermaking method and dying the coated raw paper and characterized by that the exposed parts of pulp fibers and the parts covered with particles of pulp fibers coexist on the surface thereof. When the Bristol test of the recording paper is performed, the recording paper has a time shorter than the min. adjacent dot driving time interval T1 of droplets of ink having two kinds of absorption coefficients Ka1 (t1<Tb), Ka2 (t2>Th) and different in the change point T2 changing from Ka1 to Ka2 and satisfies formula.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording paper useful for color recording, especially color recording using an inkjet recording system, an inkjet recording method and a recording system using the recording paper.

[0002]

2. Description of the Related Art Inkjet recording systems have been attracting attention because they can easily achieve high-speed recording, colorization, and high-density recording, and recording apparatuses using the inkjet recording system have also become widespread. Such ink jet recording methods include, for example, JP-A-59-35977 and JP-A-1-13568.
A dedicated coated paper as disclosed in Japanese Patent Publication No. 2 has been used. Dedicated coated paper is a paper whose surface is completely covered with pigment and is suitable for forming high-definition and clear images, but has the following problems: 1) Plain paper It lacks the texture like (PPC paper or general high-quality paper).

2) Pencil writability is poor.

3) Paper dust is generated due to the coating layer falling off.

4) It is not versatile (cannot be used for other recording methods).

5) It is more expensive than plain paper.

Here, the plain paper refers to PPC paper, general high-quality paper, and the like, and an example of the plain paper is Japanese Patent Laid-Open No. 51-13.
Toner transfer papers (PPC papers) for electrophotographic recording, which are now widely used in offices, such as those described in JP-A No. 244, JP-A-59-162561, JP-A-59-191068 and the like are mentioned. To be

[0008]

The conventional recording paper in which all pulp fibers are exposed on the surface, such as plain paper represented by such transfer paper, has the following problems.

1) The ink absorbency is poor, and when a large amount of ink is applied, the drying and fixing of the ink is slow. If an object touches the recording surface with the ink not yet fixed and not dried, the image will be damaged.

2) When the ink is absorbed in the paper layer, the ink is bleeding along the fibers of the paper, so that the dots are excessively bleeded, and the periphery of the dots is jagged or blurred, which is clear. Text and images cannot be obtained.

3) When trying to obtain a color image,
Since the inks of multiple colors are superimposed one on top of the other before they are fixed on the paper, colors may bleed at the boundary between different color images,
The images are not uniformly mixed (hereinafter, this phenomenon is referred to as bleeding), and a satisfactory image cannot be obtained.

4) The water resistance of the recorded image is insufficient because a water-soluble recording agent is used.

5) The coloring property of the colorant is insufficient.

Therefore, an object of the present invention is, in particular, a recording paper having the excellent characteristics (image quality, image density, water resistance, etc.) of a full-color ink jet recording paper or a conventional dedicated coated paper, and solving the above-mentioned problems, An object of the present invention is to provide an inkjet recording method and a recording system using the same.

Another object of the present invention is to provide a recording paper which can be used in an electrophotographic recording system, a thermal transfer system and an impact system, and can also be used as a writing paper such as a pencil, felt-tip pen and ballpoint pen. .

[0016]

[Means and Actions for Achieving the Object]
It is achieved by the following invention.

That is, the present invention is a recording paper mainly composed of pulp fibers and a filler, in which a portion where the pulp fibers are exposed on the surface and a portion where the pulp fibers are covered with particles coexist, and the Bristow test is performed. when performing the two types of absorption coefficient _{Ka 1 (t 1 <T h} ) and Ka ₂ (t _2> T _h) has the change point T _h which varies from the Ka ₁ to Ka ₂ is,
The recording paper is characterized in that it is shorter than the minimum adjacent dot ejection time interval T ₁ of ink droplets of different colors and that Ka ₁ and Ka ₂ satisfy the following conditions.

Ka ₁ ≤ 5.0 5.0 <Ka ₂ ≤ 15.0

Further, the present invention is an ink jet recording method characterized in that color recording is performed on the above-mentioned recording paper by using inks of three colors of yellow, magenta and cyan. It is a method of ejecting droplets by applying thermal energy,
Including a black ink in addition to the ink.

Further, the present invention is a recording system including an ink jet recording apparatus and recording paper used for the same, wherein the recording paper is the recording paper described above.

The present invention will be described in detail below.

The first characteristic of the recording paper of the present invention is that it is composed mainly of pulp fibers and a filler, and a portion where the pulp fibers are exposed on the surface and a portion where the pulp fibers are covered with particles coexist. Is.

More preferably, in the area of 1 mm ^{2 on} the surface of the paper, one or more fibers of pulp having a length of 100 μm or more are recognized as fibers, and the fibers are covered with particles. That is, there is a part where fibers and shapes are not recognized.

The second characteristic of the present invention is that, when a Bristow test is conducted, two kinds of absorption coefficients Ka ₁ are shown in the curve represented by the contact time of ink with the recording paper and the ink transfer amount.
(T ₁ <T _h ) and Ka ₂ (t ₂ > T _h ), and Ka
_The change point T _h changing from ₁ to Ka ₂ is shorter than the minimum adjacent dot ejection time interval T ₁ of ink droplets of different colors, and Ka ₁ ≦ 5.0 and 5.0 <Ka ₂ ≦ 15.
It is 0.

The Bristow test is a test method defined by the Japan Pulp and Paper Technology Association (J'TAPPI).
J'TAPPI No. 51, Paper and Paperboard Liquid Absorbency Test Methods.

The Bristow test is performed with the ink of the recording system used. When the recording system to be used uses an ink having a high surface tension and an ink having a low surface tension, the ink having a high surface tension is used for the measurement. Further, the head box slit width of the Bristow test is adjusted according to the surface tension of the ink.

Here, the above-mentioned minimum adjacent dot driving time interval means the print mode of the recording system to be used.
When the mode in which the printing time per unit area of 100% duty is the shortest is used, it means the shortest time interval among the time intervals for applying ink droplets of different colors to adjacent pixels. For example, using a mode in which a printing time of a unit area of 100% duty in a certain recording system is the shortest, a time interval T ₁ for applying A color and B color to adjacent pixels and A color and C color are applied. When the time interval T ₂ (T ₂ > T ₁ ) to be applied and the time interval T ₃ (T ₃ > T ₂ > T ₁ ) for applying the A color and the D color are different, the shortest time interval T _{1 is referred} to.

The inventor of the present invention has arrived at the present invention by finding that there is a correlation between the ink jet recording suitability and the result of the Bristow test of paper.

The Bristow test measurements were made on the inks of the recording system used. In the Bristow test, the amount of liquid transfer per unit area (v: ml / m with respect to the 1/2 power of the contact time of liquid with paper (√t (sec ^1/2 ))
² ) is obtained, and the absorption coefficient Ka indicates the slope of the graph.

FIG. 1 shows the measurement results by the Bristow test.

The recording paper A had Ka ₁ ≦ 5.0, small bleeding rate and good character quality, but did not have the change point T _h , so the ink absorption speed was poor and the bleeding was poor, and especially full color It is not suitable for images, and since solid areas are not completely filled, the image density is also low.

The recording paper B has Ka ₁ ≦ 5.0 and 5.0 <
Since Ka ₂ ≦ 15.0, the bleeding rate is small and the character quality is good, and since Ka ₂ also satisfies the conditions, the image density is high. However, although there is a change point T _h , T _h ≧ T ₁
Since it is (minimum adjacent dot ejection time interval), the ink absorbency is poor and bleeding easily occurs.

The recording paper C has Ka ₁ ≦ 5.0 and T _h <T ₁
Therefore, the blur rate is small and the character quality is good, but Ka ₂ >
Since it is 15.0, since the ink absorbency is too good, the ink reaches the back of the paper, and the image density becomes low.

The recording paper D has _Th <T ₁ , but Ka ₁
Since ≧ 5.0 and Ka ₂ > 15.0, bleeding does not occur, but the bleeding rate is large, the characters are thick, the character quality is poor, and the image density is low.

The recording paper E has _Th <T ₁ and 5.0 <Ka.
_{Since 2} ≦ 15.0, bleeding does not occur and the image density is high. However, since Ka ₁ > 5.0, the bleeding rate is large, the characters are thick, and the character quality is poor.

The recording paper F satisfies the above conditions, and when such a recording paper is used, the bleeding rate is small, the character quality, the fixing property and the bleeding do not occur, and the image density is high and a high-definition image is obtained. Can be obtained.

Next, the present invention will be described in detail by showing preferable specific examples of the present invention.

The recording base paper used in the present invention is LBK.
Chemical pulp represented by P, NBKP, etc., sizing agents, and fillers are mainly used, and other papermaking auxiliaries are used as necessary.
Paper is made by a conventional method. As the pulp material used,
Mechanical pulp or recycled pulp may be used in combination,
It may be based on these.

Examples of the sizing agent include rosin size, alkyl ketene dimer, alkenyl succinic anhydride, petroleum resin type size, epichlorohydrin, acrylamide and the like, and fillers include calcium carbonate, kaolin, talc, titanium dioxide and the like. However, the present invention is not limited to these.

Examples of the surface coating agent include casein, starch, cellulose derivatives such as carboxymethyl cellulose and hydroxymethyl cellulose, polyvinyl alcohol, polyvinylpyrrolidone, sodium polyacrylate, polyacrylamide and the like, and a hydrophilic resin swelling with respect to ink, SBR latex, acrylic emulsion, styrene / acrylic acid copolymer and other resins having hydrophilic and hydrophobic moieties in the molecule, silicone oil, paraffin, wax, fluorine compounds, and other water-repellent substances, and the sizing agents described above. And so on.

Inorganic pigments and organic pigments that have been conventionally used may be used in combination. Examples of inorganic pigments include
Examples thereof include silica, alumina, aluminum silicate, magnesium silicate, hydrotalcite, calcium carbonate, titanium oxide, clay and talc, but are not limited thereto. Examples of organic pigments include
Representative examples thereof include plastic pigments such as urea resin, urea formalin resin, polyethylene resin, polystyrene resin, but are not limited thereto.

These materials have a recording surface of 0.1 to 5 g.
/ M ² is provided.

In preparing the recording paper of the present invention,
The above-mentioned pigment, resin, an aqueous coating liquid containing other additives, by a known method, for example, a roll coater method, a blade coater method, an air knife coater method, a gate roll coater method, a size press method, a shimsizer method, etc. Apply on the surface of the base paper. afterwards. For example, the recording paper of the present invention can be obtained by drying using a hot air drying oven, a hot drum or the like. Furthermore, in order to smooth the surface or increase the strength of the surface, a super calendar treatment may be performed.

Using the above materials, a recording paper having a surface shape peculiar to the present invention is prepared.

The recording paper of the present invention has a water extraction pH of 6 or more,
It is more preferably adjusted to 7 or more. The water extraction pH is the pH of the extract when about 1.0 g of the test piece specified in JIS-P-8133 is immersed in 70 ml of distilled water.
Is measured according to JIS-Z-8802.
If the pH is less than the above range, problems may occur in the long-term storage stability of the paper itself, and the dye may not exhibit sufficient color developability on the paper surface.

If the Steckigt sizing degree of the recording paper thus prepared is too high, the ink will not be absorbed in the paper layer for a long time, so that the fixing property and the drying property of the adhered ink tend to be deteriorated. . For this reason, the Steckigt sizing degree is preferably within the range of 0 to 40 seconds.

As the ink itself for carrying out ink jet recording on the recording paper described above, known inks can be used without any problems. Also, as ink, direct dye,
Water-soluble dyes typified by acid dyes, basic dyes, reactive dyes, and food dyes can be used, and any dyes for ordinary ink jet recording can be used without particular limitation.

However, in the ink jet recording method of the present invention, a particularly preferable mode is an ink jet recording method using an ink containing a direct dye and / or an acid dye as a recording agent. Such a water-soluble dye is generally used in a conventional ink in a proportion of about 0.1 to 20% by weight, and the same may be applied to the present invention.

The solvent used in the aqueous ink used in the present invention is water or a mixed solvent of water and a water-soluble organic solvent,
Particularly preferred are water, a water-soluble solvent and a mixed solvent,
The water-soluble organic solvent contains a polyhydric alcohol having an effect of preventing ink drying.

Next, regarding the ink jet recording system,
This will be described below. The inkjet recording method can be applied to any of the conventionally known inkjet recording methods in which a droplet of ink is ejected from a nozzle to perform recording by using various driving principles. As a typical example, in the method described in Japanese Patent Application Laid-Open No. 54-59936, the ink subjected to the action of thermal energy undergoes a rapid volume change, and the action force due to this state change ejects the ink from the nozzle. An inkjet method can be used. An example of an inkjet recording apparatus suitable for the inkjet recording method of the present invention will be described below. An example of the head configuration, which is the main part of the apparatus, is shown in FIGS.
Shown in.

The head 13 is a glass, ceramics, or plastic plate having a groove 14 through which ink passes, and a heating head 15 used for heat-sensitive recording (a head is shown in the drawing, but is not limited to this). It is obtained by bonding and. The heating head 15 includes a protective film 16 made of silicon oxide, aluminum electrodes 17-1 and 17-.
2. A heating resistor layer 18 made of nichrome or the like, a heat storage layer 19, and a substrate 20 having a good heat dissipation property such as alumina.

The ink 21 has a discharge orifice (fine hole) 2
2, the meniscus 23 is formed by the pressure P.

Now, when an electric signal is applied to the electrodes 17-1 and 17-2, the area indicated by n of the heating head 15 rapidly generates heat, and bubbles are generated in the ink 21 in contact therewith,
The pressure causes the meniscus 23 to project, the ink 21 to be ejected, and the recording droplet 25 to be ejected from the orifice 22 to fly toward the recording sheet 25. FIG. 7 shows an external view of a multi-head in which many heads shown in FIG. 5 are arranged. The multi-head is manufactured by closely adhering a glass plate 27 having a multi-groove 26 and a heating head 28 similar to that described in FIG.

Incidentally, FIG. 5 shows the head 1 along the ink flow path.
3 is a cross-sectional view of FIG. 3, and FIG. 5 is a sectional view taken along line AB of FIG. 1.

FIG. 8 shows an example of an ink jet recording apparatus incorporating such a head. In FIG. 8, reference numeral 61 denotes a blade as a wiping member, one end of which is held by a blade holding member to become a fixed end, which is in the form of a cantilever. The blade 61 is disposed adjacent to the recording area by the recording head, and in the case of this example,
The recording head is held in a protruding form in the moving path of the recording head.
Reference numeral 62 denotes a cap, which is disposed at a home position adjacent to the blade 61, and has a configuration in which it moves in a direction perpendicular to the moving direction of the recording head and contacts the ejection port surface to perform capping. Further, 63 is an ink absorber provided adjacent to the blade 61, and like the blade 61, is held in a form protruding in the moving path of the recording head. The blade 61, the cap 62, and the absorber 63 constitute a discharge recovery unit 64, and the blade 61 and the absorber 63
Thus, water, dust, etc. are removed from the ink ejection port surface.

Reference numeral 65 denotes a recording head having ejection energy generating means, which ejects ink to a recording medium facing the ejection port surface where ejection ports are arranged for recording, and 66 denotes a recording head 65 having the recording head 65 mounted thereon. It is a carriage for moving the. The carriage 66 slidably engages with the guide shaft 67, and a part of the carriage 66 is connected (not shown) to a belt 69 driven by a motor 68. As a result, the carriage 66 can move along the guide shaft 67, and the recording head 65 can move the recording area and its adjacent area.

Reference numeral 51 designates a paper feed section for inserting a recording medium, and 5
A paper feed roller 2 is driven by a motor (not shown). With these configurations, the recording medium is fed to the position facing the ejection opening surface of the recording head, and is ejected with the ejection roller 53 arranged as the recording progresses.

In the above structure, when the recording head 65 returns to the home position after recording is completed, the cap 62 of the head recovery section 64 is retracted from the movement path of the recording head 65, but the blade 61 is projected into the movement path. There is. As a result, the ejection port surface of the recording head 65 is wiped. When the cap 62 comes into contact with the protruding surface of the recording head 65 to perform capping, the cap 62 moves so as to protrude into the moving path of the recording head. Recording head 6
When 5 moves from the home position to the recording start position, the cap 62 and the blade 61 are at the same position as the above-described position at the time of wiping. As a result, the ejection opening surface of the recording head 65 is wiped even during this movement. To move the recording head to the home position,
Not only at the end of recording or at the time of ejection recovery, the recording head moves to the home position adjacent to the recording area at a predetermined interval while moving in the recording area for recording, and the wiping is performed with this movement. .

In the case of colorization, four recording heads containing black, cyan, magenta, and yellow inks are arranged in parallel on the carriage 66. Further, one recording head may be divided into four columns in a row without arranging the recording heads in parallel. Furthermore, the ink may be three colors of cyan, magenta, and yellow instead of four colors.

[0060]

EXAMPLES The present invention will be described in more detail below with reference to examples.

(Preparation of recording paper) C.I.
S. F. 80 parts of LBKP and NB beaten to 420 ml
KP 20 parts mixture, silica 10 parts, cationized starch 0.4 parts, polyacrylamide (manufactured by Harima Kasei)
0.2 parts and 0.25 parts of neutral rosin sizing agent (Size Pine NT, manufactured by Arakawa Chemical Co., Ltd.) are blended, and the basis weight is 80 g by a conventional method
A recording base paper 1 of / m ² was produced. The silica of the above raw material composition was changed to 10 parts of alumina, and the basis weight was 81 g by a conventional method
A recording base paper 2 of / m ² was produced. By replacing 10 parts of pseudo boehmite with silica in the raw material composition of the above recording base paper 1, a recording base paper 3 having a basis weight of 82 g / m ^{2 was} produced by a conventional method.

The silica of the raw material composition of the above recording base paper 1 was changed to 10 parts of kaolin (made by Tsuchiya Kaolin), and the content of the neutral rosin sizing agent was 0.4 parts.
The recording base paper 4 of / m ² was produced.

The following coating composition A was applied to each of the above recording base papers by a bar coater method in a dry coating amount of 2 g.
Coating papers 1 to 4 were prepared by coating so as to be / m ² .
Similarly, the coating composition B is applied to the recording base paper 1 to form the recording paper 5
Was prepared.

(Coating liquid composition) Coating liquid A Fine powder silica (Mizukasil P-78D, manufactured by Mizusawa Chemical) 10 parts Polyvinyl alcohol (PVA105, manufactured by Kuraray) 10 parts Water 80 parts Coating liquid B Fine powder silica (mizukasil) P-78D, manufactured by Mizusawa Chemical Co., Ltd. 5 parts Cationized polyvinyl alcohol (CM318, manufactured by Kuraray) 15 parts Water 80 parts

When the surface shape of these recording papers was observed with a scanning electron microscope, it was confirmed that a portion where the pulp fibers were exposed and a portion where the pigment was covered coexisted on the surface.

Table 1 shows the recording paper 1 prepared as described above.
Results of Bristow test of ~ 5 are shown. For measurement,
The following inks were used.

(Ink Composition) Ink (surface tension; 48 dyne / cm) Dye x part Glycerin 5 parts Thiodiglycol 5 parts Isopropyl alcohol 4 parts Water balance Dye Black; C.I. I. Food Black 2 3.5 parts yellow; C.I. I. Direct Yellow 86 2nd Magenta; C.I. I. Acid Red 35 2.5 parts Cyan; C.I. I. Direct Blue 199 2.5 parts

(Recording Device) Recording was carried out by a recording device equipped with an ink jet type recording head using the thermal energy as an ink discharge source to evaluate the recording suitability. The following was used as a recording device.

A recording apparatus equipped with a recording head having recording nozzles at a rate of 14.2 per 1 mm. 6K
The recording head is driven to eject ink at a drive frequency of Hz. When the average value of the volume of the ink droplets ejected from each color recording head was measured, black: 38 pl, yellow: 41 pl, magenta: 39 pl, cyan: 39 p
It was l. When ink jet recording is performed, the maximum ink amount given to one pixel is 80 pl when printing red (mixed color of yellow and magenta) and green (mixed color of yellow and cyan). The maximum ink amount is 10 nl / mm ² .

(Evaluation Items) 1. Image Density A solid image with 100% duty is formed with black ink, and the reflection density after standing for 12 hours is measured by a reflection densitometer Macbeth R.
It was measured with D-918.

2. Bleeding Solid portions of black, yellow, magenta, cyan, blue, green and red were printed adjacent to each other, and the degree of bleeding at the boundary of each color was visually observed. The bleeding at a level at which there is practically no problem was rated as ○, and other levels were rated as ×.

3. Character Quality Evaluation is made with the letters "Denshaku" of black, yellow, magenta, cyan, blue, green, and red, and those with sharp edges and sharp letters are marked with ○, and the letters are crushed. Those that could not be read or were extremely inferior in quality were rated as x.

Table 1 shows the evaluation results of recording papers 1-5.

[0074]

[Table 1]

(Explanation of Action and Effect of the Present Invention in Each Specific Example) With reference to Table 1, the action and effect of the present invention will be explained more specifically.

The minimum ejection time interval (T ₁ ) between adjacent dots of the recording apparatus used in this embodiment is 30 msec. Is. Absorption coefficient Ka _1, Ka ₂ and the inflection point T _h recording sheet 1-3 that meet the conditions, the image density is high, since the bleeding ratio is small, it may be character quality, high-definition image without occurrence of bleeding Is obtained.

On the other hand, like the recording paper 4, Ka ₁
Is 5 ml / m ² · msec. Those with ^1/2 or less, but no change points, have a small bleeding rate and the solid portions are not filled, so the image density is low, and the ink absorption speed is poor, so bleeding occurs.

Like the recording paper 5, the absorption coefficient Ka ₁ is 5 ml.
/ M ² · msec. ^If it is more than ^1/2 , the bleeding rate will increase,
Character quality is poor. Furthermore, Ka _{2 is} also 15 ml / m ² · ms
ec. ^{Since it is 1/2} or more, the ink density is too low and the image density is low.

[0079]

According to the recording paper of the present invention and the recording method using the same prepared as described above, particularly as a full-color ink jet recording paper, high color developability, no character quality and no bleeding occur, It is possible to form an image close to water-resistant coated paper.

Further, this recording paper does not generate paper powder due to the coating layer falling off, and has a texture like plain paper.

Further, this recording paper is an electrophotographic recording system,
It can be used as thermal transfer recording and impact type recording paper, can be used as writing paper such as a ballpoint pen and pencil, and has high versatility, and can be provided at significantly lower cost than coated paper.

[Brief description of drawings]

FIG. 1 is a diagram showing a Bristow test result of a recording paper of the present invention.

FIG. 2 is a vertical cross-sectional view of an inkjet recording head used in the present invention.

FIG. 3 is a cross-sectional view of an inkjet recording head used in the present invention.

FIG. 4 is an external perspective view of a head having multiple heads shown in FIGS. 2 and 3.

FIG. 5 is a perspective view showing an example of an inkjet recording apparatus.

[Explanation of symbols]

 61 Wiping Member 62 Cap 63 Ink Absorber 64 Ejection Recovery Section 65 Recording Head 66 Carriage

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masato Katayama 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (5)

[Claims] 1. A recording paper mainly composed of pulp fibers and a filler, in which a portion where the pulp fibers are exposed on the surface and a portion where the pulp fibers are covered with particles coexist, and a Bristow test was conducted. Sometimes two types of absorption coefficient Ka ₁ (t
₁ <T _h ) and Ka ₂ (t ₂ > T _h ), where Ka ₁
Wherein the change point T _h to change the Ka ₂ is in the different colors shorter than the minimum adjacent dots implantation time interval T ₁ of the ink droplets, and Ka ₁ and Ka ₂ is satisfies the condition below from And recording paper. Ka ₁ ≤ 5.0 5.0 <Ka ₂ ≤ 15.0 2. An ink jet recording method, wherein color recording is performed on the recording paper according to claim 1 by using inks of three colors of yellow, magenta and cyan. 3. The ink jet recording method according to claim 2, wherein the ink jet recording is a method in which thermal energy is applied to the ink to eject droplets. 4. The ink jet recording method according to claim 3, wherein a black ink is used in addition to the ink. 5. A recording system including an inkjet recording device and a recording paper used for the same, wherein the recording paper is
A recording system comprising the recording paper according to claim 1.