JP2003191591A - Image forming method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming method capable of obtaining an image excellent in scratch resistance and having good sharpness in a case an additional recording is to be applied to an image forming medium. <P>SOLUTION: In the image forming method for bonding liquid drops of a recording liquid to the image forming medium to form an image, the liquid drops are formed by heating and melting ink substantially solid at the normal temperature, and the contact angle thereof to the surface of the image forming medium is larger than 85°. The center surface average roughness of the surface of the image forming medium is not less than 0.4 μm, and porous powdery fine particles are contained in the image forming medium in an amount of 400 mg/m<SP>2</SP>or more. A hydrophilic binder is added to the surface of the image forming medium, the pH of the film surface of the image forming medium is 4-7, the softening point of the image forming medium is 50-100°C, and the oxygen permeability of the image forming medium is not less than 600 ml/m<SP>2</SP>/ hr/atm. The image forming medium is subjected to ink jet recording after the silver halide in the image recording medium is exposed and developed. After an image is formed on an image recording medium by a means other than an ink jet means, the liquid drops formed by the ink substantially solid at the normal temperature are emitted to the image. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image recording method. More specifically, the present invention relates to an image forming method capable of easily additionally printing an image such as a silver salt print.

[0002]

2. Description of the Related Art When forming an image, various image forming methods have been proposed. When adding an image on top of an image, various combinations of the image forming methods can be considered. As a typical printing method,
Examples thereof include those using a silver halide photographic light-sensitive material and inkjet recording methods.

In conventional ink jet recording systems, water-based inks using water as a main solvent and oil-based inks using an organic solvent as a main solvent are generally used. Printed images using water-based inks are generally inferior in water resistance, whereas oil-based inks can provide printed images having excellent water resistance. However, these water-based and oil-based inks are liquids at room temperature, and when they are printed on a recording paper, they easily penetrate because they penetrate quickly,
It was difficult to obtain a sufficient print density. Furthermore, since the ink is a liquid at all times, precipitates such as dye aggregates are easily generated from the ink during storage, and these precipitates block the ink flow paths and ejection ports, making the inkjet recording system more reliable. It was a cause of a large drop.

For the purpose of improving the drawbacks of these conventional solution type inks, so-called hot melt type oil-based inks for ink jet recording have been proposed which use an ink which is solid at room temperature and melts by heating. Specifically, in US Pat. No. 3653932, an ink containing a dialkyl ester of sebacate, US Pat. No. 4,390,369 and JP-A-58-108 are used.
No. 271 proposes an ink containing a natural wax, and JP-A No. 59-22973 proposes an ink containing stearic acid. However, these conventional methods have a drawback that the image forming portion is easily peeled off or damaged.

Further, when an image is formed on a conventional silver halide photographic light-sensitive material and an additional printing or printing is added, an ink jet recording method can be easily carried out, but an ink jet recording method using a normal liquid ink is used. When added, bleeding and cissing occurred, and normal printing and printing could not be performed. When hot-melt ink jet recording is applied, additional recording can be easily performed without bleeding or repelling, but there is a drawback that problems such as peeling or scratching of the additional image portion are likely to occur.

[0006]

SUMMARY OF THE INVENTION The present invention has been made as a result of various studies, and an image excellent in scratch resistance can be obtained, which is particularly good when additional recording is performed on an image-formed medium. An object is to provide an image forming method with good sharpness.

[0007]

In order to solve the above-mentioned problems and to achieve the object, the present invention has the following constitution.

According to a first aspect of the present invention, in an image forming method of forming a droplet of a recording liquid and adhering the droplet to an image forming medium for recording, the droplet is substantially at room temperature. The image forming method is characterized in that it is formed by heating and melting an ink in a solid state, and the contact angle of the surface of the image forming medium with pure water is larger than 85 degrees. An excellent image can be obtained and the image has good sharpness, and is particularly good when additionally recorded on a medium on which an image is formed.

According to a second aspect of the present invention, in an image forming method of forming a droplet of a recording liquid and adhering the droplet to an image forming medium for recording, the droplet is substantially at room temperature. An image forming method, characterized in that the image is formed by heating and melting an ink in a solid state, and the center surface average roughness of the surface of the image forming medium is 0.4 μm or more. An image having excellent durability is obtained, and the sharpness of the image is good, especially when additionally recorded on the image-formed medium.

According to a third aspect of the present invention, in an image forming method of forming a droplet of a recording liquid and adhering the droplet to an image forming medium for recording, the droplet is substantially at room temperature. Formed by heating and melting an ink in a solid state, and 40% of porous powder fine particles are added to the image forming medium.
This is an image forming method characterized by containing 0 mg / m ² or more, and an image excellent in scratch resistance can be obtained, the image sharpness is good, and particularly good when additionally recorded on the image formed medium.

According to a fourth aspect of the present invention, in an image forming method of forming droplets of a recording liquid and adhering the droplets to an image forming medium for recording, the droplets are substantially at room temperature. An image formed by heating and melting an ink in a solid state, containing a hydrophilic binder on the surface of the image forming medium, and having a film surface pH of 4 to 7 on the surface. This is a forming method, and an image excellent in scratch resistance can be obtained, and the image sharpness is good, and particularly good when additionally recorded on a medium on which an image is formed.

According to a fifth aspect of the invention, in an image forming method of forming a droplet of a recording liquid and adhering the droplet to an image forming medium for recording, the droplet is substantially at room temperature. Is formed by heating and melting an ink in a solid state, and the image forming medium has a softening point of 50 ° C. to 10 ° C.
The image forming method is characterized in that the temperature is 0 ° C., an image excellent in scratch resistance can be obtained, and the sharpness of the image is good.

According to a sixth aspect of the present invention, in an image forming method of forming a droplet of a recording liquid and adhering the droplet to an image forming medium for recording, the droplet is substantially at room temperature. Is formed by heating and melting an ink in a solid state, and the oxygen permeability of the image forming medium is 600 m.
The image forming method is characterized in that it is 1 / m ² · hr · atm or more, and an image excellent in scratch resistance can be obtained.
The image has good sharpness, and is particularly good when additionally recorded on a medium on which an image is formed.

According to a seventh aspect of the invention, in the image forming method of forming a droplet of the recording liquid and adhering the droplet to the image forming medium for recording, the droplet is substantially at room temperature. The image-forming medium is formed by heating and melting an ink in a solid state, and the image-forming medium is subjected to development processing after exposure to contained silver halide and before the ink-jet recording. An image forming method characterized by that an image excellent in scratch resistance can be obtained, which is particularly good when additionally recorded on a medium on which an image is formed, and when image formation is combined, the sharpness of the additional image is improved. Is good.

The invention described in claim 8 is formed by forming an image on the image recording medium by means other than ink jet, and then further heating an ink in a substantially solid state at room temperature on the image. The image forming method according to any one of claims 1 to 7, characterized in that droplets are ejected, which is good when additional recording is performed on a medium on which an image is formed, and image forming is combined. In this case, the sharpness of the additional image is good.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the image forming method of the present invention will be described in detail with reference to the drawings, but the present invention is not limited to these embodiments.

In the image forming method of this embodiment, the solid ink jet recording apparatus shown in FIGS. 1 and 2 is used. FIG. 1 is a perspective view of the solid ink jet recording apparatus, and FIG. FIG.

In the solid ink jet recording apparatus of this embodiment, the ink jet head 1 has a predetermined gap with respect to the image forming medium 2. The inkjet head 1 is provided with an ink tank 3 and a heater 4. The ink tank 3 stores the ink 5 which is in a substantially solid state at room temperature.

One or more temperature sensors (not shown) are connected to the ink jet head 1, and the temperature of the ink jet head 1 and the ink tank 3 can be adjusted by interlocking with the heater 4, and the liquid of the recording liquid is used. A droplet is formed, and the droplet is attached to the image forming medium 2 for recording.

This ink jet recording apparatus has an excellent advantage as a means for high-definition image output and high-speed printing by ejecting ink as minute liquid droplets from the nozzle 6 to record characters and figures. . A more stable image can be obtained by a recording method in which the solid ink at room temperature is heated and melted and ejected as droplets. In such a solid inkjet recording method, since the ink is held in a liquid state,
During operation of the apparatus, it is necessary to continue heating the ink to a high temperature of about 50 to 150 ° C.

In this embodiment, the droplets are formed by heating and melting the ink 5 which is in a substantially solid state at room temperature.
Room temperature represents 25 ° C., and the solid ink 5 is used at this temperature.

The ink which is substantially solid at room temperature is described in JP-A-10-279861, page 2, left line 34 to right line 3. In particular,
Inks containing dialkyl sebacates in US Pat. No. 3,653,932, US Pat.
In Japanese Patent No. 390369 and JP-A-58-108271, inks containing natural wax, in JP-A-59-22973, inks containing stearic acid, and in JP-A-61-83268. Is an ink containing an acid or alcohol having 20 to 24 carbon atoms and further containing a ketone having a relatively high melting point thereof. In JP-A-62-48774, thermosetting having a high hydroxyl value. An ink containing a resin, a solid organic solvent having a melting point lower than 150 ° C., and a small amount of a dye substance, in JP-A-62-112627, a colorant, a solid at room temperature, and heating to a temperature higher than room temperature. Then, an ink comprising a first solvent that liquefies and a second solvent that dissolves the first solvent and is liquid at room temperature and has high volatility. In 2-295973 discloses, it is possible to use ink or the like containing a dye soluble synthetic wax and the wax having a polar group.

According to the first aspect of the present invention, as shown in FIG. 3, the contact angle θ of the surface of the image forming medium 2 with the pure water 10 is greater than 85 degrees, which is excellent in scratch resistance. This is preferable in that an excellent image can be obtained, the sharpness of the image is good, and the effects of the present invention can be effectively obtained.

The contact angle θ is an angle formed by the solid surface and the tangent line drawn to the droplet at the intersection of the surface of the pure water 10 placed on the surface of the image forming medium 2 and the solid surface. And page 7 of JP-A-5-294057.

It can be measured by the method described.

That is, the American Pulp and Paper Technology Association Standard (T
APPI STD) T458 om-84 The initial contact angle of the base paper surface in the case of using distilled water was measured by the method defined in "Wet surface of paper (contact angle method)". As a device for defining the contact angle, FACE contact angle method CA-D type (manufactured by Kyowa Interface Science Co., Ltd.) was used. The initial contact angle means the contact angle 5 seconds after the water droplet comes into contact with the paper, and the rate of change of the contact angle was obtained from the following equation. R = (θ−θ ′) / 55 Here, R = rate of change of contact angle, θ = initial contact angle (contact angle after 5 seconds), and θ ′ = contact angle after 60 seconds.

Examples of image forming medium substances having a contact angle of 85 degrees or more include a medium containing polytetrafluoroethylene, polyvinyl chloride, polystyrene, polytrifluoroethylene, or polyethylene on the surface thereof.
More preferred is a medium having a contact angle of 90 degrees or more and containing polytetrafluoroethylene or polyethylene on the surface.

A more preferable image forming medium is an image forming medium having a contact angle different by 10 degrees or more on the surface opposite to the ink image applying surface.

According to the second aspect of the present invention, when the image forming medium 2 has a center plane average roughness of 0.4 μm or more, an image excellent in scratch resistance can be obtained. This is preferable in that the sharpness of the image is good and the effects of the present invention can be effectively obtained.

The average roughness of the center plane is described in JP-A-11-1511.
Issue 8 page 6

~

It can be measured by the method described in.

That is, the center surface average roughness (SRa) can be represented by a numerical value represented by the following formula.

[0031]

[Equation 1]

Where SRa represents the central surface average roughness, Lx represents the length of the measurement surface area in the X-axis direction, Ly represents the length of the measurement surface area in the Y-axis direction, and SA Represents the area of the measurement surface area, and SA = Lx × Ly, where Lx =
7.5 mm and Ly = 21 mm, f (x, y) represents the surface uneven surface, and x and y represent the position coordinates of the measurement point in the x direction and the y direction, respectively.

The image forming medium 2 has a center plane average roughness of 0.6 μm or more, more preferably 0.8 to 0.8.
2.0 μm is most preferable.

In the third embodiment of the present invention, when the image forming medium 2 contains the porous powder fine particles in an amount of 400 mg / m ² or more, an image excellent in scratch resistance can be obtained, and the sharpness of the image can be further improved. It is often preferable because the effects of the present invention can be effectively obtained.

As this porous fine powder, Japanese Patent Laid-Open No. 10-
No. 319543, page 3

~

Those described in can be used.

That is, the porous fine particle powder is a fine particle powder having pores. This porous fine particle powder is a powder of a substance that can be dispersed in a hydrophilic binder, and the average particle size is preferably 0.1 to 10 μm, and 0.5 to 5 μm.
Is more preferable. The porous fine particle powder may be used alone or as a mixture with another non-spherical fine particle powder. Examples of the porous fine particle powder of an organic compound include natural and synthetic organic polymer compounds such as cellulose esters, polymethylmethacrylate, polystyrene or polydivinylbenzene and copolymers thereof. Among them, porous fine particle powder of an inorganic compound. Is preferred.

Specific inorganic compounds include silica, alumina, aluminum hydroxide, titanium oxide, barium sulfate, calcium carbonate, magnesium sulfate, glass beads, synthetic mica and the like. The most preferred of these is silica.

The surface area of the porous fine particle powder is 100 m ² /
g or more, and preferably 200 m ² / g or more.
The average pore size of the pores is preferably 300Å or less,
More preferably, it is 250Å. The surface area and pore diameter of the porous fine particle powder can be determined by the gas adsorption method.

A method for producing a porous fine particle powder is described in US Pat. Nos. 1,665,264, 1,935,176, 2,071,987, 2,459,903 and 2,462. No. 798, No. 2,469,314, No. 2,505,895, No. 2,685,569, No. 3,066,092, No. 4,070,286, etc. Can be made.

The layer to which the porous fine particle powder is added is a non-photosensitive hydrophilic colloid layer farthest from the support, specifically a protective layer. The porous fine particle powder may be directly added to the coating solution for forming the non-photosensitive hydrophilic colloid layer as a powder, but the coating solution for forming the non-photosensitive hydrophilic colloid layer after being dispersed in water or an aqueous gelatin solution. It is more preferable to add to. As a means for dispersing the porous fine particle powder in water or an aqueous gelatin solution, a stirrer, a homogenizer, a colloid mill, a flow jet mixer, an ultrasonic disperser or the like can be used.

In the embodiment described in claim 4, the image forming medium 2 contains a hydrophilic binder on the surface thereof, and the film surface pH of this surface is 4 to 7, and further between 4 and 6. It is preferable that an image having excellent scratch resistance is obtained, the sharpness of the image is good, and the effects of the present invention are effectively obtained.

The film surface pH referred to here is the pH of the raw sample, and the film surface pH can be measured with an electrode that normally measures pH by dropping a few drops of water on the raw sample.

The pH of the film surface is adjusted by the kind of binder and
It can be changed by the kind and addition amount of the hardener, and the film surface pH adjuster. For example, as an additive for lowering the film surface pH, specifically, hydrochloric acid, sulfuric acid, acetic acid, citric acid, sulfurous acid,
Examples thereof include acidic compounds such as phthalic acid and benzoic acid.
The layer contained is not particularly limited.

According to the fifth aspect of the present invention, the softening point of the image forming medium 2 is 50 ° C. to 100 ° C. This softening point is the temperature at which the surface of the image forming medium begins to soften by heating and can be formed by adding a thermoplastic polymer to the binder for the recording layer. The image forming medium includes
The glass transition temperature preferably contains a thermoplastic polymer having a temperature of -60 ° C to 95 ° C.

In the sixth embodiment, the oxygen permeability of the image forming medium 2 is 600 ml / m ² · hr · at.
It is preferable that it is m or more because an image excellent in scratch resistance can be obtained, the image sharpness is good, and the effect of the present invention can be effectively obtained.

The oxygen transmission rate is as described in JP-A-8-15835.
Issue Bulletin page 4

~

It can be adjusted by the measuring method and changing method described.

That is, the oxygen permeability is 600 ml / m ² · h
It must be at least r.atm, but 1500
It is preferably at least ml / m ² · hr · atm in order to effectively obtain the effects of the present invention.

The oxygen permeability of the image forming medium can be controlled by changing the support or the polymer material laminated on the support, or adjusting the amount of the polymer added to the support substrate. As a preferable support, a double-sided resin-coated paper support using a resin having a large oxygen transmission rate, a support having a thin resin film thickness, a paper support, or a paper support using recycled paper is used. Can be mentioned.

The oxygen transmission rate in the present invention is A
NSI (American National Sta)
ndards Institute) / ASTM D-
1434 method (Standard Test Metho)
ds for GAS TRANSMISSION R
ATEOF PLASTIC FILM AND SH
It is a value measured by the method described in EETING), and more specifically, it is separated by a support sheet for testing between two chambers filled with oxygen gas (23 ° C./0% relative humidity) according to the above-mentioned Method. Then, the oxygen pressure in both chambers is set to a high pressure and a low pressure, and the gas permeation rate is monitored by changing the atmospheric pressure. The support sample to be tested needs to be placed in an environment of 23 ± 2 ° C. and 50 ± 5% relative humidity for at least 40 hours before the test.

Next, the invention according to the seventh embodiment will be described. Image forming medium 2 of this embodiment
As shown in FIG. 4, after the silver halide contained in the image forming medium 2 is exposed and developed, an image 20 is formed. After forming the image 20, an image 21 is formed by inkjet recording. It was formed.

That is, after the silver halide grains contained in the silver halide photographic light-sensitive material are exposed to light, the image-forming medium 2 subjected to the development treatment is further heated and melted with the ink which is substantially solid at room temperature. The formed droplets are inkjet-attached to add recording. The surface to which the hot-melt ink is attached may be the image side formed from the silver halide photographic light-sensitive material or the back side, but is preferably the side opposite to the image.

By carrying out such an image forming method, it is possible to easily carry out an image and a printing to be added to a clear image of the silver halide photographic light-sensitive material, and the added image is hardly scratched. Further, another effect that the sharpness is good can be obtained.

Conventionally, when an attempt was made to print on the back surface of an image forming medium formed from a photographic light-sensitive material, liquid ink jetting or thermal transfer from an ink ribbon was carried out. Inferior.

The development time of the silver halide photographic light-sensitive material is more preferably 30 seconds or less. As a preferable silver halide photographic light-sensitive material, JP-A-10-319
Materials described in the specification of Japanese Patent No. 543, more specifically, the materials described in Examples of the specification are preferable. That is, a silver halide photographic light-sensitive material in which at least one light-sensitive silver halide emulsion layer and at least one light-insensitive hydrophilic colloid layer are coated on a reflective support, and the non-light-sensitive hydrophilic layer farthest from the support is used. It is preferable that the functional colloid layer contains porous fine particle powder in an amount of 400 mg or more per 1 m ^{2 of} silver halide photographic light-sensitive material and is hardened with a hardening agent having 3 or more functional groups in one molecule. .

In the invention of the first to seventh embodiments, a method other than ink jet is used, for example, by exposing to silver halide and then developing to perform image recording, image recording by electrophotography, and thermal transfer. It is preferable to eject droplets formed by further heating the ink in a substantially solid state at room temperature on the image formed by image recording or the like. With this method, as shown in FIG. 4, a composite print of an image can be easily obtained. Further, another effect that the sharpness is good can be obtained. In some cases, the added image can be peeled off and the hidden image can be used as a private mail or a lottery.

[0056]

EXAMPLES The present invention will be described below with reference to examples.
Embodiments of the present invention are not limited to these. Example 1 A paper support was prepared by laminating high density polyethylene on both sides of a paper pulp having a basis weight of 180 g / m ² . However, on the image forming side, a laminated layer of 30 g / m ^{2 of} melted polyethylene containing surface treated anatase type titanium oxide dispersed in a content of 15% by weight (center surface average roughness SRa = 0 on emulsion side) was used. 0.15 μm) to obtain a reflection support having a thickness of 230 μm. Further, the same sample was prepared except that the surface resin was changed variously. The following inkjet recording was performed on these samples. As the ink jet recording, the ink (ink A) described in the example of JP-A-8-300684, printing by a device, and printing were added. As a comparative inkjet recording, Epson PM80
0C and Epson PM800C dedicated ink (ink B)
The same printing and printing information was recorded by using.

The scratch resistance and sharpness of the image thus formed were evaluated. The rubbing resistance was evaluated by rubbing the surface with a ballpoint pen tip after the image was formed, and scoring the printing in five levels.

An average of 10 evaluators was taken. 5: Almost no rub even when rubbed 4: Slightly rubbed when rubbed 3: Rubbed fairly when rubbed, and it is difficult to determine what was printed.
The lowest level of commercialization 2: It is difficult to understand what was printed by rubbing 1: Almost rubbing when rubbing, and I do not know what was printed.

With respect to sharpness, the formed image was evaluated on a scale of 5 and the average of 10 evaluators was taken. 5: The hair of the person image is clearly visible and has a three-dimensional effect. 4: The face of the person image and the contours of the eyes can be clearly seen, but there is no sense of sharpness of the hair 3: The face of the person image has sharp contours but the contours of the eyes are not clear 2: The face of the person image The outline is visible but not clear 1: The outline of the human image is blurred The results obtained in this way are shown in Table 101. With the sample of the present invention, an image having good scratch resistance was obtained. Also, an image with good sharpness was obtained.

[0060]

[Table 101]

Example 2 The same results as in Example 1 except that the type of the paper pulp of the recording medium was changed, the average roughness of the center surface of the surface was changed, and the results were evaluated. Shown at 201. With the sample of the present invention, an image having good scratch resistance was obtained. Also, an image with good sharpness was obtained.

[0062]

[Table 201]

Example 3 Gelatin 10 was applied to the surface of the recording medium of Sample 101 of Example 1.
A sample having a coating layer was prepared by adding g / m ² and fine particle powder silica (average particle diameter 2 μm, pore diameter 210 Å, surface area 300 m ² / g) in the addition amounts shown in Table 301. The results of evaluating these samples in the same manner as in Example 1 are shown in Table 301.
Shown in. With the sample of the present invention, an image having good scratch resistance was obtained. Also, an image with good sharpness was obtained.

[0064]

[Table 301]

Example 4 10 g of gelatin was applied to the surface of the recording medium of Sample 101 of Example 1.
/ M ² was applied and the surface film pH was changed as shown in Table 401 to prepare each sample, which was evaluated in the same manner as in Example 1. The results are shown in Table 401. With the sample of the present invention, an image having good scratch resistance was obtained. Also, an image with good sharpness was obtained.

[0066]

[Table 401]

Example 5 In the zenlan coating film of Sample 401 of Example 4, Table 501
Each of the materials was prepared by adding the polymer particles shown in 1 and changing the addition amount to change the softening point of the film surface. The results of evaluating these samples in the same manner as in Example 1 are shown in Table 501. With the sample of the present invention, an image having good scratch resistance was obtained. An image with good sharpness was obtained. Further, the sample recorded by inkjet was further heat-treated with a heating roller having a surface temperature of 95 ° C., whereby the scratch resistance of the sample of the present invention was further improved.

[0068]

[Table 501]

Example 6 Each sample was prepared by changing the polymer coating amount of the sample 102 of Example 1 to change the oxygen permeability. The results of evaluating these samples in the same manner as in Example 1 are shown in Table 601. With the sample of the present invention, an image having good scratch resistance was obtained.
Also, an image with good sharpness was obtained.

[0070]

[Table 601]

Example 7 A sample 101 described in Example 1 of Japanese Patent Laid-Open No. 10-319543 was prepared, and this sample was subjected to white light wedge exposure, and the treatment described in Example of the same specification was performed. It was Inkjet recording was performed on the surface of this sample opposite to the image surface. Table 701 shows the result of evaluation performed in the same manner as in Example 1. The inkjet B has an advantage that additional printing can be easily performed even on a print sample made of a silver halide photographic light-sensitive material. Further, there is little deterioration in scratch resistance.
The sharpness was also good.

[0072]

[Table 701]

[0073]

As described above, according to the first aspect of the invention, the droplets are formed by heating and melting the ink which is in a substantially solid state at room temperature, and the surface of the image forming medium. Since the contact angle with pure water of is greater than 85 degrees, an image with excellent scratch resistance can be obtained, and the sharpness of the image is good,
This is particularly good when additional recording is performed on the image-formed medium.

According to the second aspect of the present invention, the droplets are formed by heating and melting the ink which is in a substantially solid state at room temperature, and the center surface average roughness of the surface of the image forming medium is , 0.4 μm or more, an image excellent in scratch resistance can be obtained, the image sharpness is good, and particularly good when additionally recorded on a medium on which an image is formed.

In a third aspect of the invention, the liquid droplets are formed by heating and melting an ink which is in a substantially solid state at room temperature, and the image forming medium contains 400 mg / m of porous powder fine particles. ^By containing ² or more, an image excellent in scratch resistance can be obtained, the sharpness of the image is good, and it is particularly good when additional recording is performed on the image-formed medium.

In the invention described in claim 4, the droplets are formed by heating and melting the ink which is in a substantially solid state at room temperature, and the surface of the image forming medium contains a hydrophilic binder. When the film surface pH of this surface is 4 to 7, an image excellent in scratch resistance can be obtained, and the sharpness of the image is good, and it is particularly good when additional recording is performed on the image-formed medium.

In a fifth aspect of the present invention, the droplets are formed by heating and melting the ink which is in a substantially solid state at room temperature, and the softening point of the image forming medium is 50 ° C. or higher.
When the temperature is 100 ° C., an image excellent in scratch resistance can be obtained, the image sharpness is good, and it is particularly good when additional recording is performed on the image-formed medium.

In a sixth aspect of the present invention, the liquid droplets are formed by heating and melting ink that is substantially solid at room temperature, and the oxygen permeability of the image forming medium is 60.
When it is 0 ml / m ² · hr · atm or more, an image excellent in scratch resistance can be obtained, and the sharpness of the image is good, and it is particularly good when additional recording is performed on the image-formed medium.

In a seventh aspect of the invention, the droplets are formed by heating and melting an ink that is in a substantially solid state at room temperature, and the image forming medium contains silver halide. The image was formed before inkjet recording by developing after exposure to, and an image with excellent scratch resistance was obtained, which was particularly good when additional recording was performed on the image-formed medium. In this case, the sharpness of the additional image is good.

In the invention described in claim 8, a liquid formed by forming an image on the image recording medium by means other than ink jet, and then further heating an ink in a substantially solid state at room temperature on the image. By ejecting droplets, it is good when additional recording is performed on the image-formed medium, and when image formation is combined, the sharpness of the additional image is good.

[Brief description of drawings]

FIG. 1 is a perspective view of a solid ink jet recording apparatus.

FIG. 2 is a diagram illustrating solid ink jet recording.

FIG. 3 is a diagram showing a contact angle θ of pure water on the surface of an image forming medium.

FIG. 4 is a diagram showing a composite print of an image.

[Explanation of symbols]

1 inkjet head 2 Image forming medium 3 ink tank 4 heater 5 ink

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shuji Kida             Konica Stock, 1 Sakura-cho, Hino City, Tokyo             In the company F term (reference) 2C056 EA13 EA30 EB20 EB30 EC07                       EC19 EC29 FA02 FC06 FD02                 2H086 BA33 BA35 BA41 BA44                 4J039 AB12 BE01 BE02 BE12 CA09                       EA36 GA24

Claims (8)

[Claims] 1. An image forming method for forming a droplet of a recording liquid and adhering the droplet to an image forming medium for recording, wherein the droplet is an ink which is substantially solid at room temperature. An image forming method, which is formed by heating and melting, and the contact angle of the surface of the image forming medium with pure water is larger than 85 degrees. 2. An image forming method of forming a droplet of a recording liquid and adhering the droplet to an image forming medium for recording, wherein the droplet is an ink that is in a substantially solid state at room temperature. An image forming method, wherein the image is formed by heating and melting, and the center surface average roughness of the surface of the image forming medium is 0.4 μm or more. 3. An image forming method for forming a droplet of a recording liquid and adhering the droplet to an image forming medium for recording, wherein the droplet is an ink which is in a substantially solid state at room temperature. An image forming method, wherein the image forming medium is formed by heating and melting, and the image forming medium contains porous powder fine particles in an amount of 400 mg / m ² or more. 4. An image forming method for forming a droplet of a recording liquid and adhering the droplet to an image forming medium for recording, wherein the droplet is an ink which is in a substantially solid state at room temperature. It is formed by heating and melting, and the surface of the image forming medium contains a hydrophilic binder.
An image forming method, wherein H is 4 to 7. 5. An image forming method of forming a droplet of a recording liquid and adhering the droplet to an image forming medium for recording, wherein the droplet is an ink which is in a substantially solid state at room temperature. An image forming method, wherein the image forming medium is formed by heating and melting, and the image forming medium has a softening point of 50 ° C. to 100 ° C. 6. An image forming method of forming a droplet of a recording liquid, adhering the droplet to an image forming medium to perform recording, wherein the droplet is an ink that is in a substantially solid state at room temperature. An image forming method, wherein the image forming medium is formed by heating and melting, and the oxygen permeability of the image forming medium is 600 ml / m ² · hr · atm or more. 7. An image forming method of forming a droplet of a recording liquid and adhering the droplet to an image forming medium for recording, wherein the droplet is an ink which is substantially solid at room temperature. An image formed by heating and melting, wherein the image forming medium is an image formed before inkjet recording by developing after exposure to contained silver halide. Method. 8. After the image is formed on the image recording medium by a means other than ink jet, a droplet formed by further heating the ink in a substantially solid state at room temperature is ejected onto the image. The image forming method according to any one of claims 1 to 7, which is characterized.