Method for producing record having stereoscopic image, and apparatus for producing record having stereoscopic image

Abstract

To provide a method for producing a record with a stereoscopic image capable of forming a stereoscopic image controlled in foamability, and having a sufficient foam height even when forming a stereoscopic image on a recording medium transported at high velocities.SOLUTION: A method for producing a record having a stereoscopic image includes: a first heating process; a foam control liquid-applying process; and a second heating process, where a surface temperature T0°C of a recording medium before heating by the first heating process, a surface temperature T1°C of the recording medium after heating by the first heating process, and a foaming start temperature Tf°C of a foam material satisfy the following formula (1): T0<T1<Tf (1).SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a method and an apparatus for producing a recorded matter having a stereoscopic image. [Background technology]

[0002] In recent years, development of a three-dimensional image forming apparatus having a function of heating and foaming a recording medium containing a foaming material to form a three-dimensional image has been underway. Patent Document 1 describes that a recording medium having a foaming layer containing foaming particles is provided with a foaming-promoting liquid containing a foaming-promoting component that lowers the foaming start temperature of the foaming particles, and then heated to obtain a recorded matter having a three-dimensional image. In addition, in order to speed up the formation of a three-dimensional image, a study is being conducted to shorten the foaming time. For example, Patent Document 2 proposes a foaming device that includes a first heater that heats a foamable medium, which is a recording medium, at a first temperature below the foaming temperature, and a second heater that heats the recording medium heated by the first heater at a second temperature equal to or higher than the foaming temperature to foam the recording medium, in order to produce a recorded matter having a desired three-dimensional image at a low temperature and at a high speed. Furthermore, Patent Document 2 describes that a foaming-promoting layer may be formed in advance on the foaming layer of the recording medium according to the desired design. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-80886 [Patent Document 2] JP 2020-138488 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, according to the study by the present inventors, it was found that further improvement is necessary in the manufacturing method of a recorded object of a three-dimensional image described in Patent Document 1 in order to form a three-dimensional image having a sufficient foaming height while increasing the conveying speed of the recording medium. In addition, as described in Patent Document 2, when a recording medium having a foaming promotion layer formed in advance on a foaming layer is used, only a predetermined three-dimensional image can be formed, and the shape of the three-dimensional image cannot be appropriately changed according to the user's request. In addition, if the foaming promotion layer is formed by a foaming promotion liquid containing a foaming promoter and a solvent, the shape of the three-dimensional image can be appropriately changed according to the user's request by changing the position where the foaming promotion liquid is applied. However, the solvent in the foaming promotion liquid is evaporated by heating with the first heater, and as a result, the viscosity of the foaming promotion liquid and the concentration of the foaming promotion agent in the foaming promotion liquid are likely to increase. If the viscosity of the foaming promotion liquid increases, it becomes difficult for the foaming promotion agent contained in the foaming promotion liquid to penetrate into the foaming layer, and it becomes difficult to promote the foaming of the foaming layer by the foaming promotion agent. In addition, if the concentration of the foaming promotion agent increases, the foaming layer will foam excessively. In this way, if the foaming-promoting layer is formed on the foaming layer of the recording medium before the preheating that is performed before the foaming of the foaming layer, it may become difficult to control the foaming properties of the foaming layer.

[0005] Therefore, an object of the present invention is to provide a method and an apparatus for manufacturing a recorded material having a three-dimensional image, which is capable of controlling the foaming property of a foaming material and forming a three-dimensional image with sufficient foaming height, even when producing a recorded material having a three-dimensional image at high speed. [Means for solving the problem]

[0006] The above object can be achieved by the present invention described below.

[0007] According to the present invention, a recording medium having a substrate and a foam layer provided on the substrate, the foam layer containing a foam material that foams upon heating and a binder resin, is heated in a first heating step; a foaming control liquid applying step of applying a foaming control liquid for controlling foaming of the foaming material to the surface of the recording medium heated in the first heating step by an inkjet recording head; a second heating step of heating the recording medium to which the foaming control liquid has been applied to form a three-dimensional image; A method for producing a recorded product having a stereoscopic image comprising the steps of: The present invention provides a method for producing a recorded material having a three-dimensional image, characterized in that the surface temperature T0 (°C) of the recording medium before being heated by the first heating step, the surface temperature T1 (°C) of the recording medium after being heated by the first heating step, and the foaming initiation temperature Tf (°C) of the foaming material satisfy the relationship of the following formula (1). T0 <T1<Tf (1)

[0008] According to the present invention, there is also provided a recording medium including a first heating device for heating a recording medium having a base material and a foam layer provided on the base material, the foam layer containing a foam material that foams upon heating and a binder resin; a foaming control liquid applying device that applies a foaming control liquid for controlling foaming of the foaming material to the surface of the recording medium heated by the first heating device by means of an inkjet recording head; a second heating device for heating the recording medium to which the foaming control liquid has been applied, to form a three-dimensional image; An apparatus for producing a recorded product having a three-dimensional image, comprising: The present invention provides an apparatus for manufacturing a recorded material having a three-dimensional image, characterized in that the surface temperature T0 (°C) of the recording medium before being heated by the first heating step, the surface temperature T1 (°C) of the recording medium after being heated by the first heating device, and the foaming initiation temperature Tf (°C) of the foaming material satisfy the relationship of the following formula (1). T0 <T1<Tf (1) Effect of the Invention

[0009] According to the present invention, it is possible to provide a method and an apparatus for producing a recorded material having a three-dimensional image, which are capable of forming a three-dimensional image with controlled foaming property and sufficient foaming height, even when producing a recorded material having a three-dimensional image at high speed. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a cross-sectional view illustrating an example of a recording medium used in a method for producing a recorded matter having a stereoscopic image. [Diagram 2] FIG. 1 is a schematic diagram showing a schematic configuration of a production apparatus for a recorded matter having a three-dimensional image. [Diagram 3] FIG. 13 is a diagram showing a specific example of the order of arrangement of a foaming control liquid applying device, a heating device, and an ink applying device in an apparatus for producing a recorded matter having a three-dimensional image. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The present invention will be described in further detail below with reference to preferred embodiments. Hereinafter, the aqueous ink for inkjet printing may be simply referred to as "ink". The foaming control liquid for forming a three-dimensional image may be simply referred to as "foaming control liquid". The method for producing a recorded material having a three-dimensional image may be simply referred to as "the method for producing a recorded material", and the apparatus for producing a recorded material having a three-dimensional image may be simply referred to as "the apparatus for producing a recorded material". Physical property values ​​are values ​​at room temperature (25°C) unless otherwise specified.

[0012] <Method of manufacturing a recorded material having a stereoscopic image> The method for producing a recorded matter of the present invention includes a first heating step of heating a recording medium having a substrate and a foaming layer provided on the substrate, the foaming layer containing a foaming material that foams when heated and a binder resin; a foaming control liquid application step of applying a foaming control liquid that controls the foaming of the foaming material to the surface of the recording medium heated in the first heating step using an inkjet recording head; and a second heating step of heating the recording medium to which the foaming control liquid has been applied to form a three-dimensional image.

[0013] The surface temperature T0 (°C) of the recording medium before being heated by the first heating process, the surface temperature T1 (°C) of the recording medium after being heated by the first heating process, and the foaming start temperature Tf (°C) of the foaming material satisfy the relationship of the following formula (1). T0 <T1<Tf (1)

[0014] When the foaming control liquid is applied to the surface of the recording medium by the inkjet recording head, the liquid penetrates into the foam layer, and the foaming start temperature of the foaming material in the foam layer changes. Therefore, when the recording medium to which the foaming control liquid is applied is heated, the foaming of the foaming material in the foam layer in the region to which the foaming control liquid is applied is promoted or suppressed. When the foaming control liquid is a foaming promotion liquid that promotes the foaming of the foam material, the region to which the foaming promotion liquid is applied in the foam layer becomes a higher convex portion than the region to which the foaming promotion liquid is not applied (i.e., the thickness of the foam layer becomes larger), and a three-dimensional image can be formed by this convex portion. On the other hand, when the foaming control liquid is a foaming inhibition liquid that suppresses the foaming of the foam material, the region to which the foaming inhibition liquid is not applied in the foam layer becomes a higher convex portion than the region to which the foaming inhibition liquid is applied, and a three-dimensional image can be formed by this convex portion.

[0015] However, even if the recording medium with the foam control liquid applied is heated within a range where the surface temperature of the recording medium does not exceed the foam start temperature (Tf) of the foamable material, the inventors' studies have found that it becomes difficult to control the foamability of the foamable material due to the decrease in the foam control component caused by the evaporation of the foam control component, or the increase in the viscosity of the foam control liquid or the increase in the concentration of the foam control component due to the decrease in the liquid in the foam control liquid. Therefore, in the present invention, in the first heating step, the recording medium before the foam control liquid is applied is heated in advance so that the surface temperature of the recording medium becomes a temperature lower than the foam start temperature (Tf) of the foamable material (i.e., T1 < Tf). Then, the foam control liquid is applied to the recording medium heated in the first heating step. By raising the surface temperature of the recording medium from the surface temperature T0 (°C) of the recording medium before heating to the surface temperature T1 (°C) of the recording medium after heating in the first heating step, when the foam control liquid is applied to the recording medium heated in the first heating step, the viscosity of the foam control liquid decreases. As a result, it becomes possible to sufficiently spread the foam control liquid throughout the entire foam layer (particularly in the thickness direction of the foam layer), and a three-dimensional image having a sufficient foam height can be formed in the subsequent second heating step. At this time, although the temperature of the foam control liquid temporarily increases by contacting the heated foam layer, since the foam control liquid is not continuously heated as in Patent Document 2, a decrease due to the evaporation of the liquid in the foam control liquid, an increase in the viscosity of the foam control liquid, an increase in the concentration of the foam control component, etc. are less likely to occur. Therefore, variations in the foamability of the foamable material due to the foam control liquid can be suppressed, and the foamability can be controlled. Also, after the foam control liquid is sufficiently spread throughout the foam layer as described above and then the second heating step is performed, first, the liquid in the foam control liquid evaporates, and the surface temperature of the recording medium increases with the heating time. And when the foam control liquid is a foam promoting liquid, when the surface temperature of the recording medium reaches the foam start temperature of the foamable material lowered by the foam promoting liquid, it becomes possible to selectively foam the region where the foam control liquid is applied. Also, when the foam control liquid is a foam suppressing liquid, when the surface temperature of the recording medium reaches the foam start temperature of the foamable material to which the foam suppressing liquid is not applied, it becomes possible to selectively foam the region where the foam suppressing liquid is not applied.As a result, a three-dimensional image with selectively controlled foaming and sufficient foaming height can be obtained.

[0016] Furthermore, in the first heating step, the surface temperature T1 of the recording medium after being heated by the first heating step and the foaming start temperature Tf (°C) of the foaming material are heated so that T1 < Tf. Thereby, in the first heating step, foaming in the foaming layer in the region where the foaming control liquid is not applied can be suppressed.

[0017] It is preferable that the surface temperature T1 of the recording medium is equal to or higher than the glass transition temperature Tg of the binder resin contained in the foaming layer of the recording medium. By controlling the surface temperature T1 within this range, before the foaming control liquid is applied to the recording medium, the binder resin contained in the foaming layer of the recording medium softens, so it is difficult to inhibit the foaming of the foaming material in the second heating step, and it becomes possible to manufacture a recording having a three-dimensional image with sufficient foaming height. Also, if heating is performed so that the surface temperature of the recording medium becomes lower than the glass transition temperature Tg of the binder resin contained in the foaming layer after the foaming control liquid is applied to the recording medium, most of the thermal energy applied in the first heating step is used for the evaporation of the liquid contained in the foaming control liquid. Therefore, when manufacturing a recording having a three-dimensional image at high speed, the surface temperature T1 of the recording medium is difficult to rise to the desired temperature, so it is difficult to sufficiently soften the binder resin contained in the foaming layer, and it becomes difficult to obtain a three-dimensional image with sufficient foaming height.

[0018] Note that the surface temperature of the recording medium is the surface temperature on the side having the foaming layer of the recording medium.

[0019] The foaming initiation temperature of the foamed material treated with the foaming control component can be measured by the following method. First, in order to make the foamed material treated with the foaming control component, the foamed material is immersed in a foaming control liquid containing the foaming control component for 10 seconds. 25 μg of the foamed material immersed in the foaming control liquid is placed as a sample in an aluminum container with a diameter of 7 mm and a depth of 1 mm. The aluminum container is attached to a thermomechanical analyzer, and with a load of 0.1 N applied from above, the foamed material is heated from 60°C to 200°C at a heating rate of 5°C / min, and the vertical displacement of the measuring terminal (the displacement of the height of the part occupied by the sample) is measured.

[0020] The temperature at the time when the displacement starts is defined as the foaming initiation temperature of the foamed material treated with the foaming control component. The foaming initiation temperature of the foamed material not treated with the foaming control component means the following temperature. That is, the foaming initiation temperature is measured in the same manner as in the foamed material treated with the foaming control component, except that the foamed material not treated with the foaming control component is used as the sample.

[0021] In the second heating step, the recording medium to which the foaming control liquid has been applied is heated to form a three-dimensional image. It is preferable that the surface temperature T1 (°C) of the recording medium after being heated in the first heating step and the surface temperature T2 (°C) of the recording medium after being heated in the second heating step satisfy the relationship of the following formula (2). T1 <T2 (2)

[0022] When T1 and T2 satisfy the relationship of the above formula (2), a three-dimensional image having a sufficient foaming height can be formed.

[0023] In addition, when the foaming control liquid is a foaming promoting liquid, it is preferable that T2, Tf, and the foaming start temperature Tf' of the foaming material to which the foaming promoting liquid has been applied (the foaming material to which the foaming promoting component has been applied) satisfy the relationship of the following formula (3). Tf' <T2<Tf (3)

[0024] When T2, Tf, and Tf' satisfy the above formula (3), only the foam layer in the area where the foaming-promoting liquid is applied can be foamed by the second heating step, and a clear three-dimensional image can be formed.

[0025] Furthermore, when the foaming control liquid is a foaming promoting liquid, it is preferable that T0, T1, T2, Tf, and Tf' satisfy the following formula (4). T0 <T1<Tf’<T2<Tf (4)

[0026] When T0, T1, T2, Tf, and Tf' satisfy the above formula (4), a clearer stereoscopic image can be formed.

[0027] On the other hand, when the foaming control liquid is a foaming inhibiting liquid, it is preferable that T2, Tf, and the foaming initiation temperature Tf″ of the foaming material to which the foaming inhibiting liquid has been added (the foaming material to which a foaming inhibiting component has been applied) satisfy the relationship of the following formula (5). Tf <T2<Tf” (5)

[0028] When T2, Tf, and Tf" satisfy the above formula (5), only the foam layer in the area where the foaming inhibitor liquid is not applied can be foamed by the second heating step, and a clear three-dimensional image can be formed. Furthermore, when the foaming initiation temperature of the foaming material treated with a foaming inhibitor cannot be measured because the foaming material no longer foams, it is preferable that T2 and Tf satisfy the relationship of the following formula (5'). Tf <T2 (5’)

[0029] Furthermore, when the foaming control liquid is a foaming inhibiting liquid, it is preferable that T0, T1, T2, Tf, and Tf″ satisfy the following formula (6). T0 <T1<Tf<T2<Tf” (6)

[0030] When T0, T1, T2, Tf, and Tf" satisfy the above formula (6), a clearer three-dimensional image can be formed. In addition, when the foaming initiation temperature of the foaming material treated with a foaming inhibitor cannot be measured because the foaming material no longer foams, it is preferable that T0, T1, T2, and Tf satisfy the relationship of the following formula (6'). T0 <T1<Tf<T2 (6’)

[0031] The method of heating the recording medium may be a method using a heating device capable of heating the surface of the recording medium to a desired temperature. In the present invention, "surface temperature T0 (°C) of the recording medium before being heated by the first heating step" means the surface temperature of the recording medium immediately before the first heating step. "surface temperature T1 (°C) of the recording medium after being heated by the first heating step" means the surface temperature of the recording medium immediately after the first heating step. "surface temperature T2 (°C) of the recording medium after being heated by the second heating step" means the surface temperature of the recording medium immediately after the second heating step. In addition, the surface temperatures T0, T1, and T2 of the recording medium can all be measured by a non-contact infrared thermometer or the like.

[0032] The surface temperature T0 of the recording medium before being heated in the first heating step is preferably room temperature, specifically, T0 is preferably 25°C.

[0033] Before or after applying the foaming control liquid to the surface of the recording medium, or before or after heating the recording medium to which the foaming control liquid has been applied, an ink containing a dye or pigment as a coloring material may be applied to the recording medium to record (print) any image.

[0034] (Recording medium) Fig. 1 is a cross-sectional view showing a schematic example of a recording medium used in the method for producing a recorded matter having a three-dimensional image. As shown in Fig. 1, a recording medium 10 has a substrate 11 and a foam layer 12 provided on the substrate 11 and containing a foaming material 13 that foams when heated. The recording medium used in the method for producing a recorded matter of the present invention will be described in detail below.

[0035] [Base material] The substrate 11 functions as a support for supporting the foam layer 12. The type of substrate is not particularly limited. Examples of the substrate include paper made of normal natural pulp; kenaf paper; plastic film sheets such as polypropylene, polyethylene, and polyester; so-called synthetic paper and nonwoven fabric made by treating synthetic fiber, synthetic pulp, and synthetic resin film as imitation paper; and the like.

[0036] [Foam layer] As shown in FIG. 1, the foam layer 12 is a layer containing a foaming material such as foamed particles 13 and a binder resin 14, which is provided on at least one surface of the substrate 11. As the foaming material, a chemical foaming material or a microcapsule type foaming material (foamed particles 13) can be used. Among them, a microcapsule type foaming material is preferable. The foamed particles 13, which are a microcapsule type foaming material, have a shell layer 15 containing a thermoplastic resin and a volatile material 16 enclosed in the shell layer 15. When heat is applied to the foamed particles 13, the thermoplastic resin constituting the shell layer 15 softens and the volatile material 16 enclosed in the shell layer 15 vaporizes and expands in volume. Therefore, the foamed particles 13 expand like a balloon. On the other hand, when heat is applied to the chemical foaming material, gas is generated from the chemical foaming material, and bubbles are formed in the foam layer 12 by the generated gas, which causes the foam layer 12 to expand. In this way, the thickness of the foamed layer can be increased by heating the foamed layer containing the foaming material.

[0037] In the microcapsule type foam material, examples of the thermoplastic resin contained in the shell layer include polystyrene, styrene-acrylic acid ester copolymer, polyamide resin, polyacrylic acid ester, polyvinylidene chloride, polyacrylonitrile, polymethyl methacrylate, vinylidene chloride-acrylonitrile copolymer, methacrylic acid ester-acrylic acid copolymer, vinylidene chloride-acrylic acid copolymer, vinylidene chloride-acrylic acid ester copolymer, etc. Among them, the thermoplastic resin is preferably a polyacrylonitrile copolymer.

[0038] In the microcapsule type foaming material, examples of the volatile material include low molecular weight hydrocarbons such as ethane, ethylene, propane, propene, n-butane, isobutane, n-pentane, isopentane, neopentane, n-hexane, heptane, and petroleum ether; chlorofluorocarbons such as CCl3F, CCl2F2, CClF3, and CClF2-CClF2; and tetraalkylsilanes such as tetramethylsilane, trimethylethylsilane, trimethylisopropylsilane, and trimethyl-n-propylsilane. Among them, the volatile material is preferably isobutane. In addition, the volatile material is preferably a hydrocarbon whose molecular weight is 120 or less. In addition, there is no particular restriction on the lower limit of the molecular weight of the volatile material (hydrocarbon), but it is preferably, for example, 50 or more.

[0039] The content of the expanded particles in the foam layer is preferably 5% by mass or more and 95% by mass or less based on the total mass of the foam layer.

[0040] Chemical foaming materials include azo compounds such as azodicarbonamide (ADCA), 4,4'-oxybis(benzenesulfonylhydrazide), 1,1'-azobis(1-acetoxy-1-phenylethane), dimethyl-2,2'-azobisbutyrate, dimethyl-2,2'-azobisisobutyrate, 2,2'-azobis(2,4,4-trimethylpentane), 1,1'-azobis(cyclohexane-1-carbonitrile), 2,2'-azobis[N-(2-carboxyethyl)-2-methyl-propionamidine]; N,N'-dinitro Examples of such foaming agents include nitroso compounds such as diphenylsulfone-3,3'-disulfonylhydrazide; hydrazine derivatives such as 4,4'-oxybis(benzenesulfonylhydrazide) and diphenylsulfone-3,3'-disulfonylhydrazide; semicarbazide compounds such as p-toluenesulfonylsemicarbazide; organic thermal decomposition type foaming agents such as trihydrazinotriazine; bicarbonates such as sodium hydrogen carbonate and ammonium hydrogen carbonate, carbonates such as sodium carbonate and ammonium carbonate; nitrites such as ammonium nitrite, and inorganic thermal decomposition type foaming materials such as hydrogen compounds.

[0041] These microcapsule type foaming materials and chemical foaming materials can be used alone or in combination of two or more kinds.

[0042] The foaming start temperature of the foaming material is preferably 80°C or more and 100°C or less. When producing a recording medium, a coating liquid containing a foaming material is usually applied onto a substrate, and then the coating liquid is dried to form a foam layer. If the foaming start temperature of the foaming material is less than 80°C, the temperature for drying the coating liquid must be set lower than the foaming start temperature, which may slightly reduce the productivity of the recording medium. On the other hand, if the foaming start temperature of the foaming material is more than 100°C, the heating temperature for forming a three-dimensional image becomes high, which may require excessive heat energy.

[0043] The foam layer 12 contains a binder resin 14 to enhance adhesion to the substrate 11. When the foam material in the foam layer is foamed by heat, the binder resin plays an important role in suppressing peeling of the foam layer from the substrate. There is no particular limitation on the binder resin, but it is preferable to use a water-insoluble resin. By including a water-insoluble resin in the binder resin, the binder resin is less likely to be dissolved by the water in the foam control liquid, so that it is possible to suppress the decrease in adhesion between the foam layer and the substrate caused by the foam control liquid. Furthermore, even if an aqueous ink containing water is applied to the recording medium, it is possible to suppress the decrease in adhesion between the foam layer and the substrate for the same reason. Here, the water-insoluble resin refers to a resin that remains at 95% by mass or more when immersed in warm water at 80°C for 2 hours. The water-insoluble resin is preferably at least one selected from the group consisting of acrylic resins and urethane resins. It is further preferable that the water-insoluble resin is at least one selected from the group consisting of acrylic resins without ester groups and urethane resins without ester groups. The water-insoluble resin is preferably a non-water-absorbent resin. The content of the water-insoluble resin in the foam layer is preferably 10% by mass or more and 95% by mass or less based on the total mass of the foam layer. The foam layer may contain a water-soluble resin together with the water-insoluble resin as long as the effects of the present invention are achieved. The glass transition temperature Tg of the binder resin is preferably -10°C or more and 30°C or less. By setting the glass transition temperature of the binder resin within the above range, it is possible to suppress the binder resin from interfering with the foaming of the foam material.

[0044] The mass ratio of the foaming material to the binder resin is preferably from 5:95 to 90:10. By setting the mass ratio of the foaming material to the binder resin within the above range, it is possible to improve both the foaming property of the foaming material and the binding property of the binder resin to the substrate.

[0045] The foam layer may further contain components such as pigments, antioxidants, dyes, and surfactants, as long as the foaming properties are not impaired.

[0046] [Surface layer] The recording medium may have a surface layer on the foamed layer as long as the foaming property of the foamed layer is not impaired. Even if the recording medium has a surface layer, it is preferable to adjust the thickness of the surface layer so that the surface temperature of the recording medium is substantially the same as the temperature of the foamed layer of the recording medium.

[0047] (Method of manufacturing recording medium) To manufacture a recording medium, first, a coating liquid for a foaming layer containing a foaming material and a binder resin is applied to the surface of a substrate to form a coating layer. Then, the formed coating layer is dried to form a foaming layer, thereby obtaining a recording medium. To apply the coating liquid for a foaming layer to the surface of a substrate, a conventional air knife coater, die coater, blade coater, gate roll coater, bar coater, rod coater, roll coater, gravure coater, curtain coater, etc., can be used. Examples of methods for drying the coating layer include a method of blowing hot air. The drying conditions (temperature, air volume, time, etc.) may be appropriately set depending on the type of substrate and the composition of the coating liquid. However, the temperature during drying must be lower than the foaming start temperature of the foaming material used.

[0048] 2g / m per side of substrate 2 It is preferable to provide a foam layer of 2 g / m or more. 2 By providing the foam layer, the foaming property can be further improved. It is also possible to use a recording medium on which a foam layer containing a foaming material is previously provided.

[0049] A backcoat layer may be provided on the surface of the substrate opposite to the surface on which the foam layer is provided. The backcoat layer may be the same layer as the foam layer containing a foaming material, or may be a layer other than the foam layer. In addition, an adhesive layer containing an adhesive resin such as an acrylic resin or an ink receiving layer for fixing a coloring material may be formed.

[0050] (Foam control liquid) The foaming control liquid is a foaming control liquid used in the above-mentioned method for producing a recorded matter. The foaming control liquid is applied to the surface of the recording medium on the side having the foam layer. The foaming control liquid will be described in detail below.

[0051] [Foam control ingredient] The foam control liquid contains a foam control component that promotes or inhibits the foaming of the foam material. In the present invention, a foam control component that promotes the foaming of the foam material is also called a "foam promoting component", and a foam control component that inhibits the foaming of the foam material is also called a "foam inhibiting component".

[0052] <<Foam-promoting ingredients>> The foaming-promoting component is a component that lowers the foaming start temperature of the foaming material. When a foaming control liquid (foaming-promoting liquid) containing the foaming-promoting component is applied to the surface of a recording medium by a method such as ejection by an inkjet method or coating, the foaming-promoting liquid penetrates the foam layer, and the foaming-promoting component in the foaming-promoting liquid acts on the foaming material contained in the foam layer, thereby lowering the foaming start temperature of the foaming material. Therefore, when the recording medium is subsequently heated, the foaming of the foaming material contained in the foam layer in the area where the foaming-promoting liquid is applied can be promoted.

[0053] When the foaming material is a microcapsule type foamed bead, the foaming-promoting component is a component that can soften the thermoplastic resin contained in the shell layer of the foamed bead, and it is presumed that as a result, the foaming initiation temperature of the foamed bead can be lowered.

[0054] The foaming-promoting component used when the foaming material is a microcapsule-type foamed particle may be any component capable of softening the thermoplastic resin contained in the shell layer of the foamed particle, and may be appropriately selected and used depending on the type of thermoplastic resin, etc. Specific examples of the foaming-promoting component include 2-pyrrolidone, dimethyl sulfoxide, N,N-dimethylformamide, and N-methyl-2-pyrrolidone. In addition, the foaming-promoting component is preferably a compound that does not have a hydroxyl group.

[0055] The absolute value of the difference (|SP1-SP2|) between the solubility parameter (SP1) of the thermoplastic resin forming the shell layer of the expanded particle (microcapsule) and the solubility parameter (SP2) of the expansion-promoting component is preferably 3.5 or less. When the absolute value of the difference in solubility parameters is within the above numerical range, the foamability of the region of the foam layer to which the expansion-promoting liquid containing the expansion-promoting component is applied can be further improved.

[0056] In addition, the absolute value of the difference (|HSP1-HSP2|) between the Hansen solubility parameter (HSP1) of the thermoplastic resin forming the shell layer of the expanded particles (microcapsules) and the Hansen solubility parameter (HSP2) of the expansion-promoting component is preferably not more than 20. When the absolute value of the difference in the Hansen solubility parameters is within the above-mentioned numerical range, the foamability of the region in the foam layer to which the expansion-promoting liquid containing the expansion-promoting component is applied can be further improved.

[0057] The solubility parameters (SP values) of the thermoplastic resin forming the shell layer and the foaming-promoting component are both calculated values. The Hansen solubility parameters (HSP values) of the thermoplastic resin forming the shell layer and the foaming-promoting component are both actual values ​​measured and calculated by dynamic light scattering.

[0058] When the foaming material is a chemically foamed material, the foam-enhancing component is a component that chemically enhances the chemical reaction required to generate gas from the chemically foamed material.

[0059] The foaming-promoting component used when the foaming material is a chemical foaming material may be any component that chemically promotes the chemical reaction for generating gas from the chemical foaming material, and may be appropriately selected and used depending on the type of chemical foaming material. Specifically, examples of the foaming-promoting component include urea compounds such as urea, zinc compounds, and the like.

[0060] The boiling point of the foaming-promoting component is preferably higher than the surface temperature T1 of the recording medium heated by the first heating step. Since the boiling point of the foaming-promoting component is higher than the surface temperature T1, the foaming-promoting component is less likely to be vaporized even when the recording medium is heated by the first heating step, and can contribute to promoting foaming of the foaming material. In addition, the boiling point of the foaming-promoting component is preferably higher than the surface temperature T2 of the recording medium heated by the second heating step.

[0061] The content of the foaming-promoting component is preferably 20% by mass or more and 90% by mass or less based on the total mass of the foaming-promoting liquid. By having the content of the foaming-promoting component within the above range, the foamability of the foam material can be improved.

[0062] <<Foam-inhibiting ingredients>> The foaming inhibiting component is a component that increases the foaming initiation temperature of the foaming material or prevents the foaming material from foaming. When a foaming control liquid (foaming inhibiting liquid) containing a foaming inhibiting component is applied to the surface of a recording medium by a method such as ejection by an inkjet method or coating, the foaming inhibiting liquid penetrates into the foam layer, and the foaming inhibiting component in the foaming inhibiting liquid acts on the foaming material contained in the foam layer, thereby increasing the foaming initiation temperature of the foaming material or preventing the foaming material from foaming. Therefore, even when the recording medium is heated thereafter, foaming of the foaming material contained in the foam layer in the area where the foaming inhibiting liquid is applied can be suppressed.

[0063] When the foaming material is a microcapsule-type expanded particle, the expansion inhibiting component is a component that can excessively soften the thermoplastic resin contained in the shell layer of the expanded particle, and as a result, it is presumed that when the expansion inhibiting component acts on the expanded particle, or when the expanded particle expands due to heating after the expansion inhibiting component acts on the expanded particle, holes are formed in the shell layer of the expanded particle, preventing the expanded particle from expanding.

[0064] The foaming inhibiting component used when the foaming material is a microcapsule-type expanded particle may be any component capable of excessively softening the thermoplastic resin contained in the shell layer of the expanded particle, and may be appropriately selected and used depending on the type of thermoplastic resin, etc. In addition, the component capable of excessively softening the thermoplastic resin in the shell layer may be the same as the foaming promoting component. However, in this case, it is preferable to increase the concentration of the foaming inhibiting component in the foaming inhibiting liquid. Specifically, the content of the foaming inhibiting component is preferably more than 90% by mass and not more than 100% by mass, and more preferably 95% by mass or more and not more than 100% by mass, based on the total mass of the foaming inhibiting liquid.

[0065] The absolute value of the difference (|SP1-SP2|) between the solubility parameter (SP1) of the thermoplastic resin forming the shell layer of the expanded particles (microcapsules) and the solubility parameter (SP2) of the expansion-inhibiting component is preferably 3.5 or less. When the absolute value of the difference in solubility parameters is within the above numerical range, the foamability of the region of the foamed layer to which the expansion-inhibiting liquid containing the expansion-inhibiting component is applied can be further reduced.

[0066] In addition, the absolute value of the difference (|HSP1-HSP2|) between the Hansen solubility parameter (HSP1) of the thermoplastic resin forming the shell layer of the expanded particles (microcapsules) and the Hansen solubility parameter (HSP2) of the expansion-inhibiting component is preferably not more than 20. When the absolute value of the difference in Hansen solubility parameters is within the above-mentioned numerical range, the foamability of the region in the foam layer to which the expansion-inhibiting liquid containing the expansion-inhibiting component is applied can be further reduced.

[0067] The solubility parameters (SP values) of the thermoplastic resin and the foaming inhibiting component forming the shell layer are both calculated values. The Hansen solubility parameters (HSP values) of the thermoplastic resin and the foaming inhibiting component forming the shell layer are both actual values ​​measured and calculated by dynamic light scattering.

[0068] When the foaming material is a chemically foamed material, the foam-inhibiting component is a component that chemically inhibits the chemical reaction necessary to generate gas from the chemically foamed material.

[0069] The foaming suppressing component used when the foaming material is a chemical foaming material may be any component that chemically suppresses the chemical reaction for generating gas from the chemical foaming material, and may be appropriately selected and used depending on the type of chemical foaming material.Specific examples of the foaming suppressing component include benzotriazole-based compounds such as 1,2,3-benzotriazole, 1-[N,N-bis(2-ethylhexyl)aminomethyl]benzotriazole, 1-[N,N-bis(2-ethylhexyl)aminomethyl]methylbenzotriazole, and 2,2'-[[(methyl-1H-benzotriazol-1-yl)methyl]imino]bisethanol.

[0070] The boiling point of the foaming inhibiting component is preferably higher than the surface temperature T1 of the recording medium heated by the first heating step. Since the boiling point of the foaming inhibiting component is higher than the surface temperature T1, the foaming inhibiting component is less likely to vaporize even if the foam layer is heated by the first heating step, and can contribute to suppressing foaming of the foam material. In addition, the boiling point of the foaming inhibiting component is preferably higher than the surface temperature T2 of the recording medium heated by the second heating step.

[0071] In the case of a foam-inhibiting component other than the component capable of excessively softening the thermoplastic resin in the shell layer, the content of the foam-inhibiting component is preferably 10% by mass or more and 70% by mass or less, based on the total mass of the foam-inhibiting liquid.

[0072] [Other ingredients] When the foam control component is liquid at room temperature (25°C), the foam control component itself may be used as the foam control liquid. The foam control liquid may further contain components other than the foam control component (other components). For example, in order to improve the ejection stability of the foam control liquid, it is preferable to further contain a liquid component such as a solvent. As the solvent, water and various water-soluble organic solvents can be used. As the water, it is preferable to use deionized water (ion-exchanged water). As the water-soluble organic solvent, alcohols, glycols, glycol ethers, nitrogen-containing compounds, etc. can be mentioned.

[0073] As components other than the liquid component, water-soluble organic compounds that are solid at a temperature of 25° C., such as urea or its derivatives, trimethylolpropane, and trimethylolethane, can be used. Furthermore, the foam control liquid may contain various additives, such as a pH adjuster, an antifoaming agent, an antirust agent, an antiseptic, an antifungal agent, an antioxidant, an antireducing agent, and a chelating agent, as necessary.

[0074] <Production device for recording material having a three-dimensional image> The apparatus for producing a recorded matter having a three-dimensional image of the present invention includes a first heating device for heating a recording medium having a substrate and a foaming layer provided on the substrate, the foaming layer containing a foaming material that foams when heated and a binder resin, a foaming control liquid applying device for applying a foaming control liquid to the surface of the recording medium heated by the first heating device using an inkjet recording head, and a second heating device for heating the recording medium to which the foaming control liquid has been applied to form a three-dimensional image. The surface temperature T0 (°C) of the recording medium before being heated by the first heating device, the surface temperature T1 (°C) of the recording medium after being heated by the first heating device, and the foaming start temperature Tf (°C) of the foaming material satisfy the relationship of the following formula (1). T0 <T1<Tf (1)

[0075] The ink, the foaming control liquid, and the recording medium used in this recording production apparatus are the same as the ink, the foaming control liquid, and the recording medium used in the above-mentioned recording production method. The recording production apparatus of the present invention can be suitably used in the above-mentioned recording production method.

[0076] The recording medium manufacturing apparatus may also include an ink storage section that stores ink, and an ink application means for ejecting ink from an inkjet recording head to record an image on a recording medium. The recording medium manufacturing apparatus may also include a foaming control liquid storage section that stores a foaming control liquid. Furthermore, the recording medium manufacturing apparatus may also include a transport means for transporting the recording medium.

[0077] Hereinafter, the details of the recording material manufacturing apparatus of the present embodiment will be described with reference to the drawings. The recording material manufacturing apparatus described below is an example of the present embodiment, and the recording material manufacturing apparatus of the present invention is not limited by the following description.

[0078] FIG. 2 is a schematic diagram showing a schematic configuration of a production apparatus for a recorded matter having a three-dimensional image according to this embodiment.

[0079] The recording material manufacturing apparatus 20 includes a first heating device 22, a foaming control liquid applying device 23, a second heating device 24, an ink applying device 25, and a transport device .

[0080] The recording medium 21 is conveyed in the direction of arrow A in FIG. 2 by a conveying device 26 as a conveying means for conveying the recording medium. The conveying device 26 has a conveying belt 27 which is an endless belt, and two rollers 28 and 29 which hold the conveying belt 27. The recording medium 21 is conveyed in the direction of arrow A by driving the rollers 28 and 29 to rotate. The conveying device 26 may also have a platen 30 which regulates the vertical displacement of the conveying belt 27. The conveying device for conveying the recording medium may also be in a form including a feed roller which feeds out a sheet-like recording medium from a roll of the recording medium, and a take-up roller which takes up the foamed recording medium into a roll.

[0081] The first heating device 22 is a heating device that heats the recording medium 21 before the foaming control liquid is applied. Examples of the first heating device include a dryer, an oven, a heater, and an iron.

[0082] The foaming control liquid applying device 23 has an inkjet recording head that ejects the foaming control liquid, and ejects the foaming control liquid from the inkjet recording head onto the recording medium 21 transported by the transport device 26 .

[0083] The second heating device 24 heats the recording medium 21 to which the foaming control liquid has been applied. The second heating device 24 may be any heating device capable of heating the surface of the recording medium to a desired temperature. Examples of the second heating device 24 include a dryer, an oven, a heater, and an iron. Note that in FIG. 2, the first heating device and the second heating device are both disposed above the recording medium (on the surface side of the recording medium) and a configuration is shown in which the recording medium is heated from above, but the arrangement of the first heating device and the second heating device is not limited thereto. For example, the first heating device and the second heating device may be disposed below the recording medium (on the back side of the recording medium) and the recording medium may be heated from below.

[0084] The ink applicator 25 has an inkjet recording head that ejects ink, and applies ink from the inkjet recording head to the recording medium 21 foamed by the second heating device 24. The ink applicator 25 may be disposed either upstream or downstream of the foaming control liquid applicator 23 with respect to the A direction, which is the transport direction of the recording medium 21, and may be disposed either upstream or downstream of the second heating device 24. Note that Fig. 2 shows a configuration in which the ink applicator 25 is disposed downstream of the foaming control liquid applicator 23 and downstream of the second heating device 24 with respect to the transport direction (A direction) of the recording medium 21.

[0085] Furthermore, the recording medium manufacturing apparatus 20 is preferably provided with a cooling device (not shown) for cooling the recording medium 21 downstream of the second heating device 24 with respect to the A direction, which is the conveying direction of the recording medium 21. The cooling device is not particularly limited as long as it can cool the heated recording medium 21, and methods such as air cooling and water cooling can be used. Among them, blowing unheated gas is preferable in terms of safety and energy efficiency. Also, by using a mechanism that incorporates a fan for injecting gas onto the recording medium 21 and blows air, it is easy to increase the cooling efficiency. The temperature of the cooling device can be set so that the image on the recording medium has a desired temperature, taking into account the conveying speed of the recording medium 21 and the environmental temperature. Note that, in order to prevent the recording medium 21 from being tightly wound when it is wound up in a roll and stored, and to prevent the foamed portion from being crushed due to compression when the recording medium 21 is stored in a stacked state, it is preferable that the recording medium 21 is cooled to 30° C. or less. This makes it possible to harden the foamed portion of the foamed layer of the recording medium, and to prevent the foamed portion from being crushed.

[0086] FIG. 3 shows the arrangement of the foaming control liquid applying device 23, the second heating device 24, and the ink applying device 25 with respect to the transport direction of the recording medium 21.

[0087] Fig. 3(a) shows a configuration in which the ink applicator 25 is disposed downstream of the foaming control liquid applicator 23 and downstream of the second heating device 24 with respect to the transport direction A of the recording medium 21. Fig. 3(b) shows a configuration in which the ink applicator 25 is disposed downstream of the foaming control liquid applicator 23 and upstream of the second heating device 24 with respect to the transport direction A of the recording medium 21. Fig. 3(c) shows a configuration in which the ink applicator 25 is disposed upstream of the foaming control liquid applicator 23 and upstream of the second heating device 24 with respect to the transport direction A of the recording medium 21. EXAMPLES

[0088] The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to the following examples without departing from the gist of the present invention. "Parts" and "%" used to describe the amounts of components are based on mass unless otherwise specified.

[0089] <Preparation of foam particles> As the foaming materials, expanded particles H1: "Matsumoto Microsphere HF-50" (manufactured by Matsumoto Yushi Seiyaku), expanded particles H2 "Expancel 007-40" (manufactured by Nippon Phillite), and expanded particles H3 "Advancel EMH204" (manufactured by Sekisui Chemical Co., Ltd.) were prepared. In addition, a thermomechanical analyzer (TMA) (trade name "TMA2940", manufactured by TA instruments) was used to measure the foaming start temperature of expanded particles H1, H2, and H3 in the following manner. 25 μg of sample was placed in an aluminum container with a diameter of 7 mm and a depth of 1 mm, and a load of 0.1 N was applied from above. In this state, the sample was heated from 60°C to 200°C at a heating rate of 5°C / min, and the displacement in the vertical direction of the measuring probe was measured. The temperature at which the displacement started was defined as the "foaming start temperature". The results are shown in Table 1. Incidentally, expanded particles H1, H2, and H3 are all microcapsule type expanded particles.

[0090] [Table 1]

[0091] <Preparation of recording medium> (Recording medium 1) A polypropylene synthetic paper roll (product name "New Yupo FGS110", manufactured by Yupo Corporation) was prepared as the substrate. The binder resin and expanded particles H1 were added to ion-exchanged water so that the binder resin:expanded particles 1 ratio was 100:50 (mass ratio), and the mixture was thoroughly stirred to obtain a coating liquid for the foam layer. An acrylic resin (acrylic emulsion, product name "Movinyl 6950", manufactured by Japan Coating Resin) was used as the binder resin. The obtained coating liquid was applied to the substrate at a coating amount of 30 g / m2. 2 The mixture was then dried to form a foam layer, and the foam layer was taken up by a take-up device to obtain a recording medium 1.

[0092] (Recording medium 2) Recording medium 2 was obtained in the same manner as recording medium 1, except that the expanded particles H1 were changed to expanded particles H2.

[0093] (Recording medium 3) Recording medium 3 was obtained in the same manner as recording medium 1, except that the binder resin was changed from Mowinyl 6950 to a urethane resin (product name "Superflex 620", manufactured by Daiichi Kogyo Seiyaku).

[0094] (Recording medium 4) Recording medium 4 was obtained in the same manner as recording medium 1, except that the expanded particles H1 were changed to expanded particles H3.

[0095] <Adjustment of foam control liquid> (Foam control liquid 1) 35 parts of dimethyl sulfoxide as a foam control component, 0.5 parts of a nonionic surfactant (product name "Acetylenol E60", manufactured by Kawaken Fine Chemicals) as a surfactant, and 64.5 parts of ion-exchanged water were mixed. After sufficient stirring, the mixture was pressure-filtered through a filter with a pore size of 1.2 μm to obtain foam control liquid 1.

[0096] (Foam control liquid 2) Foam control liquid 2 was obtained in the same manner as for foam control liquid 1, except that dimethyl sulfoxide was changed to N,N-dimethylformamide.

[0097] (Foam control liquid 3) Foam control liquid 3 was obtained in the same manner as in foam control liquid 1, except that dimethyl sulfoxide was changed to N-methyl-2-pyrrolidone.

[0098] (Foam control liquid 4) Foam control liquid 4 was obtained in the same manner as in the preparation of foam control liquid 1, except that dimethyl sulfoxide was changed to 2-pyrrolidone.

[0099] (Foam control liquid 5) Foam control liquid 5 was obtained in the same manner as in foam control liquid 1, except that the amount of dimethyl sulfoxide added was changed to 95 parts and the amount of ion-exchanged water added was changed to 4.5 parts.

[0100] The foaming control liquids 1 to 4 are all foaming promoting liquids that promote the foaming of the microcapsule type foamed particles, while the foaming control liquid 5 is a foaming inhibiting liquid that inhibits the foaming of the microcapsule type foamed particles.

[0101] <Production of Recorded Materials> Example 1 A recorded material was produced using the same recording material production apparatus as that shown in FIG. 2, except that the heater, which is the first heating device, is mounted under the recording medium and the cooling device is not shown. The surface temperature T0 of the recording medium before being heated by the first heating device was room temperature (25°C). First, the recording medium is heated by the first heating device. Then, after confirming that the surface temperature T1 of the recording medium has reached 35°C with an IR sensor (infrared sensor), the foaming control liquid 1 is applied to the foam layer of the recording medium 1 at 21 ng for a pixel number of 600 dpi x 600 dpi by a foaming promotion liquid application device having an inkjet recording head. Five seconds after the foaming control liquid 1 is applied to the recording medium 1, the recording medium 1 to which the foaming control liquid 1 has been applied is heated by the second heating device for 10 seconds with hot air so that the surface temperature T2 of the recording medium becomes 88°C. Furthermore, the recording medium heated by the second heating device is cooled by a cooling device having an air blowing mechanism until the surface temperature of the recording medium becomes room temperature (25°C), and the recorded material 1 is obtained.

[0102] (Examples 2 to 9, Comparative Examples 1 and 2) Recorded objects 2 to 9, 11, and 12 were obtained in the same manner as in Example 1, except that the recording medium, foaming control liquid, surface temperature T1 of the recording medium, time until heating by the second heating device begins after application of the foaming control liquid, and surface temperature T2 of the recording medium were changed to those shown in Table 2.

[0103] Example 10 A recorded matter 10 was obtained in the same manner as in Example 1, except that the recording medium was not cooled by a cooling device.

[0104] Comparative Example 3 Recorded matter 13 was obtained in the same manner as in Example 1, except that heating with the first heating device was not performed.

[0105] [Table 2]

[0106] <Evaluation> Using a digital micrometer (product name "M-30", manufactured by Sony), the height of the foamed part of the foam control liquid in the printed part and the unprinted part of the obtained recorded matter was measured. The foam height is the absolute value of the difference in foam height between the printed part and the unprinted part. The results are shown in Table 3. AA: The foam height was 280 μm or more. A: The foam height was 250 μm or more and less than 280 μm. B: The foam height was 210 μm or more and less than 250 μm. C: The foam height was less than 210 μm.

[0107] [Table 3] [Explanation of symbols]

[0108] 10 Recording media 11 Base material 12 Foam layer 13 Foam materials 14 Binder resin 15 Shell Layer 16 Volatile Materials 21 Recording media 22 First heating device 23 Foam control liquid application device 24 Second heating device 25 Ink application device

Claims

1. A first heating step involves heating a substrate and a recording medium having a foamed layer provided on the substrate, which contains a foamed material that expands when heated and a binder resin. A foam control liquid application step is performed by applying a foam control liquid, which controls the foaming of the foaming material, to the surface of the recording medium heated by the first heating step, using an inkjet recording head. A second heating step involves heating the recording medium to which the foam control liquid has been applied to form a three-dimensional image, A method for manufacturing a recording having a three-dimensional image having, A method for manufacturing a recording material having a three-dimensional image, characterized in that the surface temperature T0 (°C) of the recording medium before heating by the first heating step, the surface temperature T1 (°C) of the recording medium after heating by the first heating step, and the foaming start temperature Tf (°C) of the foaming material satisfy the relationship of the following formula (1). T0<T1<Tf (1)

2. A method for manufacturing a recording material having a three-dimensional image according to claim 1, wherein the surface temperature T1 and the surface temperature T2 (°C) of the recording medium after heating by the second heating step satisfy the relationship of formula (2) below. T1 < T2 (2)

3. A method for manufacturing a recording material having a three-dimensional image according to claim 1, wherein T1 is higher than the glass transition temperature Tg of the binder resin.

4. A method for manufacturing a recording having a three-dimensional image according to claim 1, further comprising a cooling step of cooling the heated recording medium after the second heating step.

5. The method for producing a recording material having a three-dimensional image according to claim 1, wherein the foaming material comprises a shell layer containing a thermoplastic resin and foaming particles having a volatile material enclosed within the shell layer.

6. The method for producing a recording material having a three-dimensional image according to claim 5, wherein the thermoplastic resin comprises a polyacrylonitrile copolymer.

7. The method for producing a recording having a three-dimensional image according to claim 5, wherein the volatile material is isobutane.

8. The method for producing a recording material having a three-dimensional image according to claim 1, wherein the foaming control liquid is a foaming accelerator containing a foaming-promoting component that lowers the foaming initiation temperature of the foaming material.

9. The method for producing a recording having a three-dimensional image according to claim 8, wherein the foam-promoting component is at least one selected from the group consisting of 2-pyrrolidone, dimethyl sulfoxide, N,N-dimethylformamide, and N-methyl-2-pyrrolidone.

10. The method for manufacturing a recording material having a three-dimensional image according to claim 8, wherein the Tf is higher than the foaming start temperature Tf' of the foaming material to which the foaming promoting component has been applied.

11. The method for manufacturing a recording material having a three-dimensional image according to Claim 1, wherein the foaming control liquid application step is performed immediately after the first heating step.

12. The method for manufacturing a recording having a three-dimensional image according to claim 1, wherein T0 is room temperature.

13. The method for manufacturing a recording material having a three-dimensional image according to Claim 1, wherein T1 is 35°C or higher.

14. The method for manufacturing a recording material having a three-dimensional image according to Claim 1, wherein Tf is 80°C or more and 100°C or less.

15. The method for manufacturing a recording material having a three-dimensional image according to Claim 1, wherein T2 is 88°C or higher.

16. A first heating device for heating a substrate and a recording medium having a foamed layer on the substrate containing a foamed material that expands when heated and a binder resin, A foam control liquid application device that applies a foam control liquid to the surface of the recording medium heated by the first heating device using an inkjet recording head to control the foaming of the foaming material, A second heating device that heats the recording medium to which the foaming control liquid has been applied to form a three-dimensional image, A manufacturing apparatus for recordings having a three-dimensional image, An apparatus for manufacturing a recording material having a three-dimensional image, characterized in that the surface temperature T0 (°C) of the recording medium before heating by the first heating step, the surface temperature T1 (°C) of the recording medium after heating by the first heating device, and the foaming start temperature Tf (°C) of the foaming material satisfy the relationship of the following formula (1). T0<T1<Tf (1)

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