JPS62142680A - Recording method - Google Patents

Abstract

PURPOSE:To obtain recorded images having excellent surface luster, recorded density, resolution, water resistance, light resistance, preservability or the like, by using a recording material which comprises a transparent layer and an ink-transporting layer and in which the image density measured from the transparent layer side after recording is higher than that measured on the ink- transporting layer side, and applying an ink from the ink-transporting layer side. CONSTITUTION:A transparent film is used as a transparent layer 1, and an ink-transporting layer 2 having a high ink-transporting property is provided on one side of the transparent layer 1. An ink applied to the ink-transporting layer is rapidly transported through the layer to reach the inside surface of the transparent film, and is accumulated there. As a result, an image 3 is formed which has a higher image density 3'' on the transparent film side as compared wit the image density 3' at the surface of the ink-transporting layer and which is more sharp on the transparent film side.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a recording method, and more specifically, a recording method that provides recorded images with high surface gloss and image density, as well as excellent resolution, water resistance, and storage stability. , particularly related to inkjet recording methods.

(Prior Art) Inkjet recording methods include various ink ejection methods, such as an electrostatic suction method, a method that applies mechanical vibration or displacement to the ink using a piezoelectric element, and a method that uses the pressure of heating the ink to foam it. This method produces small droplets of ink, causes them to fly, and makes some or all of them adhere to a recording material such as paper. It is attracting attention as a recording method that allows color printing.

Ink for inkjet recording is mainly composed of water for safety and recording characteristics, and polyhydric alcohols are added to prevent nozzle clogging and improve ejection stability. In many cases.

The recording material used in this inkjet recording method has conventionally been a recording material consisting of a base material called ordinary paper or inkjet recording paper on which a porous ink receiving layer is provided. However, as the performance of inkjet recording apparatuses increases and becomes more widespread, such as faster recording speeds and multicolor recording, more advanced and wide-ranging properties are being required of recording materials. In other words, the recording material for inkjet recording to obtain high-resolution, high-quality recorded images must (1) be able to receive ink as quickly as possible on the recording material, and (2) have overlapping ink dots. (3) Ink droplets do not spread on the recording material and the diameter of the ink dot does not become larger than necessary, (4) ) The shape of the ink dot should be close to a perfect circle and its circumference should be smooth. (5) The OD (optical density) of the ink dot should be high and the periphery of the dot should not be blurred.

It is necessary to satisfy basic requirements such as:

Furthermore, in order to obtain high-resolution recorded image quality comparable to color photography using a multicolor inkjet recording method, in addition to the above-mentioned required performance, (6) the coloring components of the ink must have excellent color development; 7) The ink fixation properties are particularly excellent, as the same number of droplets as the number of ink colors may adhere to the same spot, (8) The surface must be glossy, (9) Whiteness A high level of performance, etc., is required.

(Problems to be Solved by the Invention) In order to meet the above requirements, recording materials (for example, coated paper) having a porous ink absorbing layer provided on a base material have conventionally been used. However, since the ink absorbing layer of this recording material is porous, there is a problem that the ink receiving layer, that is, the recording surface has no gloss and the OD (optical density) of the formed ink dots is low.

As methods for imparting surface gloss, methods such as applying a transparent overcoat to the recording surface after recording or laminating a transparent film are known, but these methods
It is complicated because it requires post-processing steps, etc., and it is difficult to implement in general homes and offices, even though mass production is difficult. Even if such a complicated process is adopted, if the image density of the recorded image itself is low, it is still impossible to obtain a recorded image with a high image density.

In addition, glossy paper with surface gloss has a glossy appearance, but has poor ink absorbency, and cannot cope with an increase in the amount of ink associated with high-speed recording and high image density.

Therefore, an object of the present invention is to provide a recording method that provides a recorded image particularly excellent in surface gloss, image density, resolution, and sharpness.

Another object of the present invention is to provide ink receptivity, water resistance, light resistance, blocking resistance of recorded images, as well as the above performance.
An object of the present invention is to provide a recording method that provides recorded images with excellent storage stability.

The above and other objects of the invention are achieved by the invention as follows.

(Disclosure of the Invention) In other words, one aspect of the present invention is a method for recording an image using ink, wherein the recording material has at least a transparent layer and an ink transport layer, and the ink is applied to the recording material from the ink transport layer side. The recording method is characterized in that the image density (A) measured from the transparent layer side is higher than the image density (B) measured from the ink transport layer side.

To explain the present invention in more detail, 1. The present inventor has created a recorded image that has high ink absorption during recording and has excellent surface gloss, image density, resolution, water resistance, light resistance, storage stability, etc. As a result of intensive research to provide a recording method that can be easily obtained all at once without the need for complicated post-processing steps such as lamination, and in particular a recording method that employs an inkjet method, we have used a recording material with a specific configuration. It has been found that the object of the present invention can be easily achieved.

That is, the recording material used in the present invention and which mainly characterizes the present invention is composed of a transparent layer and an ink transport layer, and the image density measured from the transparent layer side after recording is the same as the image density measured from the ink transport layer side. The object of the present invention is achieved by using such a recording material and applying ink from the ink transport layer side.

In addition, unless otherwise specified, the image density referred to in the description of this specification is the reflective optical density measured by a Macbeth Co., Ltd. densitometer (model number, TR-524).Illustratively represents the principle of the method of the present invention. Referring to the accompanying drawings, as shown in FIG.
As a transparent layer l.

For example, when a transparent film is used and an ink transport layer 2 with high ink transport properties is formed on one surface of the film, the ink applied to the ink transport layer quickly passes through the ink transport layer and is transferred to the inner surface of the transparent film. As a result, the image density 3' of the formed image 3 as seen from the transparent film side is lower than the image density 3' of the formed image 3 on the surface of the ink transport layer.
It has been found that the image 3'' is higher and clearer.

Such effects have been achieved by using a highly transparent film as the transparent layer and making the ink transport layer preferably have a large structure with opaque to translucent ink transport properties.

FIG. 2 shows another preferred embodiment of the recording material used in the present invention. This is an example in which a layer 4 is formed. According to this embodiment, the ink applied to the ink transport layer 2 quickly passes through the ink transport layer 2 and is concentrated in the ink holding layer 4, so that the ink transport Image density 3' on the surface of layer 2
Since the image density 3'' of the ink retaining layer 4 is higher than that of the image 3'' of the ink retaining layer 4, and the image 3 of the ink retaining layer 4 is observed from the transparent film 1 side, the image 3'' measured from the transparent film l side
The density of the image 3' is one year higher than that of the image 3' measured from the ink transport layer 2 side.

In the present invention, the image density measured from the transparent layer 1 side is generally about 1.2 times or more, further 1.5 times or more, and 2.0 times more than the image density measured from the ink transport layer 2 side. It is also extremely easy to do the above.

If an image is formed using ink using a recording material having the above-mentioned configuration, there is no problem with the image density and surface gloss of the ink transport layer 2 becoming low.
The ink absorbency can be increased freely by mixing a large amount of filler or making it porous, and there is no need to hold ink on one surface, so there is no need to use highly water-soluble materials. Therefore, water resistance, blocking resistance, etc. can be freely improved.

The ink applied from the ink transport layer 2 side quickly reaches the interface with the transparent layer, and when the formed image is observed through the transparent layer, the image density is very high and the transparent layer has a high gloss and transparency. High surface gloss can be obtained by using the film.

Therefore, there is no need for a lamination process or the like as in the prior art.

Furthermore, the coloring materials that form images, such as dyes, are not held on the surface of the recording material, but are mostly present at the interface between the transparent layer and the ink transport layer, so they are not affected by the outside world. Therefore, migration of the dye due to moisture absorption, discoloration and fading of the dye due to light, etc. are significantly improved.

The recording material used in the present invention as described above is generally obtained by forming an ink transport layer on a transparent film serving as a transparent layer. Suitable examples of such a transparent film include: For example, polyester resins, diacetate resins, triacetate resins, polyolefin resins such as polyethylene and polypropylene, polystyrene resins, acrylic resins, polycarbonate resins, polyvinyl chloride resins, polyimide resins, cellophane, celluloid, etc. Examples include films or plates. The thickness of such a transparent film is generally 10 to 5.0
It is about 00 lm.

The ink transport layer formed on the transparent film as described above is
As mentioned above, it is necessary to absorb and transport the ink and transport it to the interface with the transparent film so that the image density seen from the transparent film side is higher than the image density seen from the ink transport layer side. As a preferred construction method, any construction may be used as long as it has these characteristics.

(1) A method of forming ink, especially water-based ink, from a hydrophilic polymer that is easy to transport and does not retain large amounts of ink.

(2) A method in which a relatively large amount of filler is contained in the ink transport layer.

(3) A method in which the ink transport layer has a porous structure.

(4) A method in which the ink transport layer has a two-layer structure, in which the surface layer is made of a material with high ink transport properties and the lower layer is made of a material with high ink retention properties.

etc.

As the polymer useful in the method (1) above, any water-soluble to hydrophilic polymer can be used, for example,
Albumin, gelatin, casein, starch, cationic starch, gum arabic, natural resins such as sodium alginate, carboxymethylcellulose, hydroxyethylcellulose, polyamide, polyacrylamide, polyethyleneimine, polyvinylpyrrolidone, quaternized polyvinylpyrrolidone, polyvinylpyricylium halide, Synthetic resins such as melamine resin, phenol resin, alkyd resin, polyurethane, polyvinyl alcohol, ion-modified polyvinyl alcohol, polyester, and sodium polyacrylate, preferably wood-philic polymers made by crosslinking these polymers to make them water-insoluble; 2 Examples include a hydrophilic and water-insoluble polymer complex consisting of more than one type of polymer, a wood-philic and water-insoluble polymer having a hydrophilic segment, and the like.

In the PJ method (2) above, when forming an ink transport layer using the water-soluble to hydrophilic polymer described above, a relatively large amount of inorganic or organic filler is mixed into the ink transport layer to form a water-soluble to hydrophilic polymer. It reduces the ink retention of the hydrophilic polymer and facilitates the transport of ink through the microscopic gaps between fillers. In this case, the filler is 10 to 10% of the ink transport layer.
It is preferable to use it so that it accounts for about 90% by weight.
In addition, the addition of such a filler makes the ink transport layer translucent or opaque, and the surface smoothness is lost, resulting in a white background and an even higher image density measured from the transparent film side. It gets expensive.

Such fillers include, for example, silica, clay,
Inorganic fillers such as talc, diatomaceous earth, calcium carbonate, calcium sulfate, barium sulfate, aluminum silicate, synthetic zeolite, alumina, zinc oxide, lithopone, and sachin white are also used, but particularly preferred are hydrophobic fillers that do not absorb ink. particles such as polystyrene, polyethylene, urea-formalin resin, polyvinyl chloride,
Examples include organic filler particles such as polymethyl methacrylate, and one or more of these may be used. If such hydrophobic particles are used, the ink holding power of the ink transport layer is reduced and the ink transport power is further increased.

Furthermore, in the above method (3), the ink transport speed is further increased by making the ink transport layer porous, and hydrophobic polymers can also be used in this method. As a method for making the layer porous, any conventionally known method can be used, such as a method in which elutable particles are present in the layer and then the particles are eluted later.

Polymers used in such a method include, in addition to the water-soluble to hydrophilic polymers described above, 7' acrylic acid ester resins, polyvinyl acetate resins, polyvinyl butyral resins, ethylene-vinyl acetate resins, Styrene-acrylic acid ester resin, polyolefin resin, polyethylene resin, ionomer resin, polyvinyl ether resin, polyester resin, polyamide resin, polyurethane resin, butadiene rubber, acrylonitrile butadiene rubber, etc. Plastic resin can be used,
These resins can be used either as solutions in organic solvents or as aqueous emulsions.

The particles for forming the porous layer have a particle size of 0.1 to
loOILm, preferably about 0.2 to 50 gm, and the amount added is 5 to 60 gm in the ink transport layer to be formed.
% by weight, preferably 10-50% by weight.

In addition, the method (4) above can be carried out by combining the methods (1) to (3) above, and the upper layer is
By forming the upper layer as a layer having good ink transport properties and the lower layer as a layer having good ink retention properties, excellent effects of the present invention can be achieved. The ink retaining layer, which is the lower layer, is preferably formed by selecting a polymer with good ink retaining properties from among the various polymers mentioned above, and preferably has a thickness of about 0.1 to 20 ILm. If it is too thick, the ink will not be able to reach the interface between the transparent film and the ink retaining layer, which is undesirable.The upper transparent layer may be formed as described in (1) to (3) above.

As a method for forming such an ink transport layer, a coating solution is prepared by dissolving or dispersing the above polymer or a mixture containing appropriate additives in an appropriate solvent, and the coating solution is used, for example, as a roll coach ink. It is preferable to apply the coating onto a transparent film by a known method such as a method, a rod bar coating method, a spray coating method, an air knife coating method, etc., and then quickly dry it. Other methods may also be used, such as forming a single sheet for the ink transport layer from such materials and then laminating the sheet to the transparent film.

The ink transport layer formed as described above quickly absorbs the ink applied during inkjet recording,
In addition, the absorbed ink needs to reach the interface between the transparent film and the ink transport layer, or the ink retaining layer provided at the interface.

Therefore, it is necessary to control the thickness of the ink transport layer to be formed so as to match the amount of ink applied during recording. When the ink transport layer is too thick compared to the amount of ink applied.

If the effect of the present invention is insufficient, and if the ink is too thin, the ink will spread excessively at the interface, resulting in a decrease in the quality of the formed image. Therefore, the thickness of the ink transport layer is generally about 1 to 200 JLm, preferably about 5 to 50 JLm. However, such adjustment of ink retention power is possible not only by changing the thickness of the ink transport layer, but also by changing the ink retention power of the ink transport layer by changing the selection of polymer, the amount of filler added, etc. The thickness of is not critical.

As above, typical aspects of the recording material used in the present invention have been illustrated and explained, but of course the recording material used in the present invention is not limited to these aspects, and has the above-mentioned configuration, operation and effect. Any compound having the following can be used in the present invention.

In the method of the present invention, the ink itself applied to the above-mentioned specific recording material for image formation may be a known ink, such as direct dye, acid dye, basic dye 1-reactive dye, food coloring, etc. It is a water-soluble dye represented by, and is particularly suitable as an ink for inkjet printing, and when used in combination with the recording materials mentioned above, it can achieve fixing properties, color development, clarity, stability, light fastness, and other required performances. Preferred ones that give an image that satisfies the following are 1, for example, C, 1, Direct Black 17.19.32.51.71.108.
146 C, 1, Direct Blue 6.22.25.71.86
．． 90,108,199 C,1, Direct Red l, 4.17.28, C,1
, Direct Niro 12.24F 26.86.98.
142 C, 1, Direct Orange 34.39.44, 46,
Direct dyes such as 60 C,1, Direct Violet 47.48C,1, Direct Brown 109 C,1, Direct Green 59, C,1
, acid black 2.7.24.26.31.52,
63.112.118 C, 1, Acid Blue 9, 22.40.59.93.
102.104.113.117.120.167.2
29.234 C, 1, Acid Red l, 6.32.37.51.5
2,80.85.87.92.94.115.180.
256,317.3150.1. Acid yellow 11.
17.23゜25.29.42.61.71 C,1, Acid Orange 7.19 Acidic dyes such as C,1, Acid Violet 49 are preferred; others, C,1, Basic Black 2 C,1, Basic Blue 1.3.5.7.9.24,
z5.26.28.29 C, 1, Basic Red 1.2.9.12.13.1
4, 37 C, 1, Basic Violet 7.14.27 C, 1
, Food Black L, 2, etc. can also be used.

The above examples of dyes are particularly preferable for inks applicable to the recording method of the present invention, but dyes for inks used in the present invention are not limited to these dyes.

Such water-soluble dyes are generally used in a proportion of about 0.1 to 20% by weight in conventional inks, and this proportion may be the same in the present invention.

A suitable solvent for use in the ink used in the present invention is water or a mixed solvent of water and a water-soluble organic solvent, and particularly preferred is a mixed solvent of water and a water-soluble organic solvent, which is a water-soluble solvent. It contains polyhydric alcohol, which has the effect of preventing ink from drying, as an organic solvent. Also, as water,
It is preferable to use deionized water rather than ordinary water containing various ions. Examples of water-soluble organic solvents used in combination with water include methyl alcohol, ethyl alcohol, n-propyl alcohol, C1-4 alkyl alcohols such as isopropyl alcohol, n-butyl alcohol, 5ec-butyl alcohol, tert-butyl alcohol, isobutyl alcohol; amides such as dimethylformamide and dimethylayatamide;
Ketones or keto alcohols such as acetone and diacetone alcohol; Ethers such as tetrahydrofuran and dioxane; Polyalkylene gelicols such as polyethylene glycol and polypropylene glycol; ethylene glycol, propylene glycol, butylene glycol, triethylene glycol, 1.2 .6-Hexandriol, thiodiglycol, hexylene glycol, diethylene glycol and other alkylene glycols containing 2 to 6 carbon atoms: glycerin; ethylene glycol methyl (or ethyl) ether, diethylene glycol methyl (or ethyl); ) Lower alkyl ethers of polyhydric alcohols such as ether, triethylene glycol monomethyl (or ethyl) ether: N
-Methyl-2-pyrrolidone, 1,3-dimethyl-2-imidazolidinone, and the like. Among these many water-soluble organic solvents, polyhydric alcohols such as diethylene glycol and lower alkyl ethers of polyhydric alcohols such as triethylene glycol monomethyl (or ethyl) ether are preferred.

The content of the water-soluble organic solvent in the ink is generally in the range of 0 to 95% by weight, preferably 10 to 80% by weight, and more preferably 20 to 50% by weight based on the total weight of the ink. be.

In addition to the above-mentioned components, the ink used in the present invention may also contain a surfactant, a viscosity modifier, a surface tension modifier, and the like, if necessary.

In the method of the present invention, the inkjet method for performing recording by applying the above-mentioned ink to the above-mentioned specific recording material is as follows:
Any method may be used as long as it can effectively separate the ink from the nozzle and apply the ink to the recording material, which is a projectile. Actions on Industry Applications (IEEE Tr.
Answers on Industry
Applications) Vol, JA-13,
No. 1 (February/March 1977 issue), Nikkei Electronics April 19, 1976 issue, January 29, 1873
It is described in the Japanese issue and the May 6, 1974 issue. The methods described above are suitable for the method of the present invention, and to explain some of them, there is an electrostatic attraction method,
In this method, a strong electric field is applied between the nozzle and an accelerating electrode placed several layers in front of the nozzle, and the ink is turned into particles and pulled out one after another from the nozzle. Information is transmitted while the drawn ink flies between the deflection electrodes. There are two methods: a method in which a signal is applied to a deflection electrode for recording, and a method in which ink droplets are ejected in response to an information signal without deflecting the ink droplets, both of which are effective for the method of the present invention.

The second method is to forcibly eject minute ink particles by applying high pressure to the ink with a small pump and mechanically vibrating the nozzle with a crystal oscillator. At the same time as the injection, it is charged according to the information signal. When the charged ink particles pass between the deflection electrode plates, they are deflected according to the amount of charge. Another method using this method is called the microdot inkjet method. In this method, ink pressure and excitation conditions are kept within a certain range of appropriate values, and two types of ink droplets, large and small, are ejected from the nozzle tip. Only small and medium-sized droplets are generated and used for recording. The feature of this method is that it is possible to obtain a group of minute droplets even with a conventionally large nozzle diameter.

A third method is a piezo element method, in which a piezo element is used as a pressure means for applying pressure to the ink, rather than a mechanical means such as a pump as in other methods. This method applies an electric signal to a piezo element to cause mechanical displacement, thereby applying pressure to the ink and ejecting it from a nozzle.

In addition, an inkjet method is disclosed in Japanese Patent Application Laid-Open No. 54-51837, in which ink subjected to the action of thermal energy undergoes a sudden change in volume, and the acting force due to this state change causes the ink to be ejected from a nozzle. can also be used effectively.

According to the present invention as described above, since the recording material used in the present invention has high ink absorption and ink transport properties in the entire ink transport layer or the surface of the ink transport layer,
The ink applied to the ink transport layer quickly reaches the interface between the transparent film and the ink transport layer. Since the transparent film has high transparency, the image viewed from the transparent film side is clearer than the image viewed from the ink transport layer side, and exhibits high optical density and surface gloss.

In particular, when the ink transport layer is porous or when an ink retention layer is formed between the transparent film and the ink transport layer,
When an ink-retaining layer is formed and an ink-transporting layer is made porous, ink applied to the ink-transporting layer quickly reaches the interface between the transparent film and the ink-transporting layer, or is quickly retained in the ink-retaining layer. Moreover, since the ink transport layer is porous, the image on the surface of the ink transport layer becomes whitish and lacks gloss, and the image seen from the transparent film side is clearer, has a higher density and gloss than the image seen from the ink transport layer side. The value will be high.

In particular, when an ink retention layer is provided between the transparent layer and the ink transport layer, the ink retention layer strongly absorbs and retains the applied ink, so the amount of ink present in the ink transport layer is small. Since the ink concentration on the inner surface of the transparent layer is high and no bleeding occurs, an image with higher density and sharpness can be obtained. In addition, by using a transparent film, such as a polyester film, as the transparent layer, which has excellent water resistance, light resistance, abrasion resistance, blocking resistance, gloss, etc., it is possible to create images with these excellent properties. can be formed. Further, by imparting a desired pattern to the transparent film in advance, an even more excellent image can be obtained.

Therefore, according to the method of the present invention, 1. By printing the characters as they are or in the case of characters with a mirror surface, they exhibit excellent ink absorption, and have excellent image density, surface gloss, sharpness, Images having water resistance, light resistance, and excellent storage stability can be easily provided all at once.

Hereinafter, the present invention will be explained in more detail with reference to Reference Examples, Examples, and Comparative Examples. In addition, parts and percentages in the text are based on weight unless otherwise specified.

Reference Example 1 (Preparation of recording material used in Examples) A polyethylene terephthalate film (manufactured by Toshi) with a thickness of l 00 ILm was used as a transparent base material, and a coating liquid with the following composition was applied onto this film. The coating was applied by a bar coater method so that the film thickness after drying was 20 gm, and dried at 100° C. for 5 minutes to form an ink transport layer, thereby obtaining a white opaque recording material.

I-technical armpit plate reduction upolystyrene resin dispersion (L-8801, average particle size 0
．． 5 gm, solid content 45%5, manufactured by Chuo Kasei) 100 parts Polyvinyl alcohol (PVA-117, 10% aqueous solution, manufactured by Kuraray) 45 parts Surfactant (Emulgen 810, manufactured by Kao) 0.05 part Reference example 2 (Example) Preparation of recording material used in Example 1) As a transparent substrate, cation-modified polyvinyl alcohol (PVA-C
-318AA, 10% aqueous solution, manufactured by Kuraray) was coated using a bar coater method so that the film thickness after drying was 3 gm,
After drying at 100°C for 10 minutes to form an ink retaining layer, a coating solution having the following composition was applied to a coating solution with a dry film thickness of 207°C.
Coated by bar coater method so that the temperature is 80℃
The mixture was dried for 10 minutes to form an ink transport layer, and a white opaque recording material was obtained.

100 parts polyvinyl methacrylate resin (Microsphere M, average particle size 8-1 OILm, manufactured by Matsumoto Yushi)
0% aqueous solution, manufactured by Kuraray) 100 parts Surfactant (Emulgen A-500, manufactured by Kao) 0.05 parts water
20 parts Reference Example 3 (Preparation of recording material used in Examples) A polyurethane ionomer (HYDRAN) was placed on the polyester film used in Reference Example 1 as a transparent base material.
AP (manufactured by Dainippon Ink and Chemicals) was coated using a bar coater method so that the film thickness after drying was 3 gm.
The ink retaining layer was formed by drying at ℃ for 10 minutes. Next, a coating solution having the following composition was applied to a coating solution with a film thickness of 201 parts m after drying.
Coated by bar coater method so that
It was dried for 0 minutes to form an ink transport layer, and a white opaque recording material was obtained.

Low density polyethylene resin dispersion (M-200, solid content: 4
0%, average particle size 5JLm, manufactured by Mitsui Petrochemical)
200 parts Ethylene-vinyl acetate copolymer solution (L-100, solid content 40%, manufactured by Mitsui Petrochemicals) 10 parts Surfactant (Perex QT-P, active ingredient 70%, manufactured by Kao) 0.05 parts Reference example 4 ( Recording Material Used in Comparative Example) A commercially available OHP film (trade name: FP-ALIO Transparent Range, manufactured by Canon) was used as a recording material for comparison.

Reference Example 5 (Recording material used in comparative example) Commercially available inkjet paper (trade name: IJ Mud Coated Paper NM, manufactured by Mitsubishi Paper Industries) was used as a recording material for comparison.

Reference Example 6 (Recording material used in comparative example) Commercially available tracing paper [trade name: Tracing (matte), 40 g/m'',
manufactured by Mitsubishi Paper Mills] was used as a recording material for comparison.

Reference Example 7 (Recording Material Used in Comparative Example) Commercially available roll paper [trade name: Pure White Roll (Hamayu), 30 g/rn', manufactured by Kishu Paper Industries] was used as a recording material for comparison.

Reference Example 8 (Recording material used in comparative example) Reprinted high-quality paper (
A product (trade name: Steel Ring 64 g/m'', manufactured by Chūyō Kokusaku Pulp) was used as a recording material for comparison.

Example An on-demand inkjet that uses the following four types of ink on the recording materials of Reference Examples 1 to 3 above, generates bubbles using a heating resistor, and ejects the ink using the pressure generated. Inkjet recording was performed using a recording device having a recording head.

1 C, 1, Direct Yellow 23 2 parts diethylene glycol 15 parts water
85 parts Aka Koni Otobun" 1 part Σ C-1, Acid Red 92 2 parts diethylene glycol 15 parts water
85 parts Mutual Eni 2 France ℃ Hongui l C, 1, Direct Blue 86 2 parts diethylene glycol 15 parts water
85 parts Otokojiro z3-jingai 1Σ C, 1, Direct Black 19 2 parts diethylene glycol 15 parts water
85 parts The evaluation results of the above method of the present invention are shown in Table 1.

Comparative Example Using the recording materials of Reference Examples 3 to 8, inkjet recording was carried out in the same manner as in the Examples, and the Examples and Applications were evaluated. The results are shown in Table 2.

Each evaluation item in Tables 1 and 2 was measured according to the following method.

(1) Ink fixation time was measured by leaving the recording material at room temperature after recording, and measuring the time taken for the ink to dry and stop adhering to the finger when touching the recorded image on the recording surface with the finger.

(2) The image density is the density manufactured by Macbeth (model number, TR-5).
24) Using a meter, the black image was measured from both the ink application side and the back side.

(3) Gloss was determined by measuring the 45 degree specular gloss of the side with higher image density based on JIS Z8741.

A comprehensive evaluation was also conducted based on the above results. In the overall evaluation, those with quick ink absorption and fixation, excellent inkjet recording suitability, gloss, and clear images are rated O, and those with sufficient recording suitability but insufficient gloss or Two types of evaluations were conducted: those with sufficient gloss but unsuitable as recording materials due to long ink fixing time, and those lacking in gloss and recording suitability were evaluated as x.

(Left below) 1 fat 5-l-j 袈 22 Liu KAI BA 嗟 将■ 2 (Takumi JL!LH) 1 ヱ
Overflowing ink transport layer surface 0. flOO,
720,57 transparent layer surface 1.70 1.80
2.20 Hikari-1---Sawa 120.0%
110.0% 118.0% Tow-JL] Ren value 0 0 0
-Commercial number-" (-Raku-) 1 Reference example G material 2 (□) A no longer (>ji L)" E plate 5 minutes 1 second 2 days
1 second 1 second - JLjL Once ink adhered surface 1.20 1.55 1.
30 1.26 0.95 Back side
1.03 - 0.90 -
-Brother-J 61.0% 4.3% 3.4% 16
．． 3% 5.7% Rainbow-jLjL-Lion x x
x x x

[Brief explanation of drawings]

FIGS. 1 and 2 are views schematically showing a cross section of a recording material used in the present invention. l; transparent layer 2; ink transport layer 3, 3'
, 3''; Image 4; Ink retaining layer Fig. 1 3'' Fig. 2

Claims (6)

[Claims] (1) A method of recording an image using ink, in which the recording material has at least a transparent layer and an ink transport layer, ink is applied to the recording material from the ink transport layer side, and the ink is applied from the transparent layer side. A recording method characterized in that the measured image density (A) is higher than the image density (B) measured from the ink transport layer side. (2) The recording method according to claim (1), in which the ratio of image density (A)/image density (B) is 1.2 or more. (3) The recording method according to claim (1), in which the ratio of image density (A)/image density (B) is 1.5 or more. (4) The recording method according to claim (1), wherein image density (A)/image density (B) is 2.0 or more. (5) The recording method according to claim (1), wherein the ink is applied to the recording material by an inkjet method. (6) The recording method according to claim (1), wherein the ink transport layer is opaque or translucent.