Method for producing recorded matter

Abstract

To provide a recording method which improves the peelability of a recording surface and a non-recording surface and can give a recorded matter with a more suppressed change in texture of the resulting recorded matter.SOLUTION: There is provided a method for producing a recorded matter which comprises: a first discharge step of discharging a first ink, which is a radiation-curable inkjet composition, followed by adhering to a recording medium; a first irradiation step of irradiating the first ink adhered to the recording medium with radiation to obtain a cured coating film of the first ink; a second discharge step of discharging a second ink, which is a radiation-curable inkjet composition, to adhere to the cured coating film of the first ink so that the duty is 1% or more and 20% or less: a second irradiation step of irradiating the second ink adhered to the recording medium with radiation to cure the second ink to obtain a recorded matter; and a lamination step of laminating the recorded matter so that a recording surface to which the first ink and the second ink are adhered and a non-recording surface to which the first ink and the second ink are not adhered face each other.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a recording material.

Background Art

[0002] The inkjet recording method uses a relatively simple device and can record high-definition images, and has been rapidly developing in various aspects. Among them, methods for forming a plurality of ink layers for recording and the like have been variously studied. For example, Patent Document 1 discloses an ink set for forming a multi-layer that has excellent image quality, glossiness, provides a good surface state, is excellent in blocking resistance, and can form an image without the color of the base layer. For this purpose, a colored ink composition containing a predetermined radically polymerizable compound and a clear ink composition are included, and an ink set in which the content of the polymerization initiator contained in the colored ink composition and the clear ink composition is adjusted is disclosed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] As described in Patent Document 1, especially when recording on an industrial film-based recording medium, the recording medium after the ink adheres may be wound up once in a roll shape for storage. In Patent Document 1, it is taught that the clear ink layer is used as a base image including the entire area where the image is formed in the image forming process. However, when the clear ink layer is used as the base ... When formed as a color image layer, when stored in a roll shape, the clear ink layer of the recording medium, etc. The recording surface to which the recording surface with adhesion and the non-recording surface on the back side thereof are attached. Then, when the recording material is rolled back from the roll and used, the image is likely to peel off from the recording surface at the attached portion, or a mark is formed, and there is a risk of damaging the recorded image.

Means for Solving the Problems

[0005] The present invention discharges a first ink which is a radiation-curable inkjet composition onto a recording medium in a first discharging step for adhesion, irradiates the first ink adhered to the recording medium with radiation in a first irradiation step to obtain a cured coating film of the first ink, discharges a second ink which is a radiation-curable inkjet composition onto the cured coating film of the first ink so as to have a duty of 1% or more and 20% or less in a second discharging step for adhesion, irradiates the second ink adhered to the recording medium with radiation in a second irradiation step to cure the second ink and obtain a recording material, and stacks the recording material such that the recording surface to which the first ink and the second ink are adhered and the non-recording surface to which the first ink and the second ink are not adhered face each other in a stacking step. This is a method for manufacturing a recording material.

Brief Description of the Drawings

[0006]

Figure 1

Figure 2

Modes for Carrying Out the Invention

[0007] Hereinafter, embodiments of the present invention (hereinafter referred to as "the present embodiment") will be described in detail with reference to the drawings as necessary. However, the present invention is not limited thereto, and various modifications are possible without departing from the gist thereof. In the drawings, the same reference numerals will be assigned to the same elements, and redundant explanations will be omitted. Also, the positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings unless otherwise specified. Furthermore, the dimensional ratios in the drawings are not limited to the illustrated ratios. Hereinafter, embodiments of the present invention (hereinafter referred to as "the present embodiment") will be described in detail with reference to the drawings as necessary. However, the present invention is not limited thereto, and various modifications are possible without departing from the gist thereof. In the drawings, the same reference numerals will be assigned to the same elements, and redundant explanations will be omitted. Also, the positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings unless otherwise specified. Furthermore, the dimensional ratios in the drawings are not limited to the illustrated ratios. Hereinafter, embodiments of the present invention (hereinafter referred to as "the present embodiment") will be described in detail with reference to the drawings as necessary. However, the present invention is not limited thereto, and various modifications are possible without departing from the gist thereof. In the drawings, the same reference numerals will be assigned to the same elements, and redundant explanations will be omitted. Also, the positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings unless otherwise specified. Furthermore, the dimensional ratios in the drawings are not limited to the illustrated ratios. Hereinafter, embodiments of the present invention (hereinafter referred to as "the present embodiment") will be described in detail with reference to the drawings as necessary. However, the present invention is not limited thereto, and various modifications are possible without departing from the gist thereof. In the drawings, the same reference numerals will be assigned to the same elements, and redundant explanations will be omitted. Also, the positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings unless otherwise specified. Furthermore, the dimensional ratios in the drawings are not limited to the illustrated ratios. Hereinafter, embodiments of the present invention (hereinafter referred to as "the present embodiment") will be described in detail with reference to the drawings as necessary. However, the present invention is not limited thereto, and various modifications are possible without departing from the gist thereof. In the drawings, the same reference numerals will be assigned to the same elements, and redundant explanations will be omitted. Also, the positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings unless otherwise specified. Furthermore, the dimensional ratios in the drawings are not limited to the illustrated ratios. Hereinafter, embodiments of the present invention (hereinafter referred to as "the present embodiment") will be described in detail with reference to the drawings as necessary. However, the present invention is not limited thereto, and various modifications are possible without departing from the gist thereof. In the drawings, the same reference numerals will be assigned to the same elements, and redundant explanations will be omitted. Also, the positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings unless otherwise specified. Furthermore, the dimensional ratios in the drawings are not limited to the illustrated ratios.

[0008] In this specification, "(meth)acryloyl" means at least one of acryloyl and its corresponding methacryloyl, "(meth)acrylate" means at least one of acrylate and its corresponding methacrylate, and "(meth)acrylic" means at least one of acrylic and its corresponding methacrylic. In this specification, "(meth)acryloyl" means at least one of acryloyl and its corresponding methacryloyl, "(meth)acrylate" means at least one of acrylate and its corresponding methacrylate, and "(meth)acrylic" means at least one of acrylic and its corresponding methacrylic. In this specification, "(meth)acryloyl" means at least one of acryloyl and its corresponding methacryloyl, "(meth)acrylate" means at least one of acrylate and its corresponding methacrylate, and "(meth)acrylic" means at least one of acrylic and its corresponding methacrylic. In this specification, "(meth)acryloyl" means at least one of acryloyl and its corresponding methacryloyl, "(meth)acrylate" means at least one of acrylate and its corresponding methacrylate, and "(meth)acrylic" means at least one of acrylic and its corresponding methacrylic. In this specification, "(meth)acryloyl" means at least one of acryloyl and its corresponding methacryloyl, "(meth)acrylate" means at least one of acrylate and its corresponding methacrylate, and "(meth)acrylic" means at least one of acrylic and its corresponding methacrylic.

[0009] 1. Method for manufacturing a recording medium The method for manufacturing a recording medium according to the present embodiment includes a first ejection step of ejecting a first ink, which is a radiation-curable inkjet composition, onto a recording medium to adhere it thereto; a first irradiation step of irradiating the first ink adhered to the recording medium with radiation to obtain a cured coating film of the first ink; a second ejection step of ejecting a second ink, which is a radiation-curable inkjet composition, onto the cured coating film of the first ink so that the duty is 1% or more and 20% or less; a second irradiation step of irradiating the second ink adhered to the recording medium with radiation to cure the second ink and obtain a recording medium; and a lamination step of laminating the recording medium so that the recording surface to which the first ink and the second ink are adhered and the non-recording surface to which the first ink and the second ink are not adhered face each other. The method for manufacturing a recording medium according to the present embodiment includes a first ejection step of ejecting a first ink, which is a radiation-curable inkjet composition, onto a recording medium to adhere it thereto; a first irradiation step of irradiating the first ink adhered to the recording medium with radiation to obtain a cured coating film of the first ink; a second ejection step of ejecting a second ink, which is a radiation-curable inkjet composition, onto the cured coating film of the first ink so that the duty is 1% or more and 20% or less; a second irradiation step of irradiating the second ink adhered to the recording medium with radiation to cure the second ink and obtain a recording medium; and a lamination step of laminating the recording medium so that the recording surface to which the first ink and the second ink are adhered and the non-recording surface to which the first ink and the second ink are not adhered face each other. The method for manufacturing a recording medium according to the present embodiment includes a first ejection step of ejecting a first ink, which is a radiation-curable inkjet composition, onto a recording medium to adhere it thereto; a first irradiation step of irradiating the first ink adhered to the recording medium with radiation to obtain a cured coating film of the first ink; a second ejection step of ejecting a second ink, which is a radiation-curable inkjet composition, onto the cured coating film of the first ink so that the duty is 1% or more and 20% or less; a second irradiation step of irradiating the second ink adhered to the recording medium with radiation to cure the second ink and obtain a recording medium; and a lamination step of laminating the recording medium so that the recording surface to which the first ink and the second ink are adhered and the non-recording surface to which the first ink and the second ink are not adhered face each other. The method for manufacturing a recording medium according to the present embodiment includes a first ejection step of ejecting a first ink, which is a radiation-curable inkjet composition, onto a recording medium to adhere it thereto; a first irradiation step of irradiating the first ink adhered to the recording medium with radiation to obtain a cured coating film of the first ink; a second ejection step of ejecting a second ink, which is a radiation-curable inkjet composition, onto the cured coating film of the first ink so that the duty is 1% or more and 20% or less; a second irradiation step of irradiating the second ink adhered to the recording medium with radiation to cure the second ink and obtain a recording medium; and a lamination step of laminating the recording medium so that the recording surface to which the first ink and the second ink are adhered and the non-recording surface to which the first ink and the second ink are not adhered face each other. The method for manufacturing a recording medium according to the present embodiment includes a first ejection step of ejecting a first ink, which is a radiation-curable inkjet composition, onto a recording medium to adhere it thereto; a first irradiation step of irradiating the first ink adhered to the recording medium with radiation to obtain a cured coating film of the first ink; a second ejection step of ejecting a second ink, which is a radiation-curable inkjet composition, onto the cured coating film of the first ink so that the duty is 1% or more and 20% or less; a second irradiation step of irradiating the second ink adhered to the recording medium with radiation to cure the second ink and obtain a recording medium; and a lamination step of laminating the recording medium so that the recording surface to which the first ink and the second ink are adhered and the non-recording surface to which the first ink and the second ink are not adhered face each other. The method for manufacturing a recording medium according to the present embodiment includes a first ejection step of ejecting a first ink, which is a radiation-curable inkjet composition, onto a recording medium to adhere it thereto; a first irradiation step of irradiating the first ink adhered to the recording medium with radiation to obtain a cured coating film of the first ink; a second ejection step of ejecting a second ink, which is a radiation-curable inkjet composition, onto the cured coating film of the first ink so that the duty is 1% or more and 20% or less; a second irradiation step of irradiating the second ink adhered to the recording medium with radiation to cure the second ink and obtain a recording medium; and a lamination step of laminating the recording medium so that the recording surface to which the first ink and the second ink are adhered and the non-recording surface to which the first ink and the second ink are not adhered face each other. The method for manufacturing a recording medium according to the present embodiment includes a first ejection step of ejecting a first ink, which is a radiation-curable inkjet composition, onto a recording medium to adhere it thereto; a first irradiation step of irradiating the first ink adhered to the recording medium with radiation to obtain a cured coating film of the first ink; a second ejection step of ejecting a second ink, which is a radiation-curable inkjet composition, onto the cured coating film of the first ink so that the duty is 1% or more and 20% or less; a second irradiation step of irradiating the second ink adhered to the recording medium with radiation to cure the second ink and obtain a recording medium; and a lamination step of laminating the recording medium so that the recording surface to which the first ink and the second ink are adhered and the non-recording surface to which the first ink and the second ink are not adhered face each other. The method for manufacturing a recording medium according to the present embodiment includes a first ejection step of ejecting a first ink, which is a radiation-curable inkjet composition, onto a recording medium to adhere it thereto; a first irradiation step of irradiating the first ink adhered to the recording medium with radiation to obtain a cured coating film of the first ink; a second ejection step of ejecting a second ink, which is a radiation-curable inkjet composition, onto the cured coating film of the first ink so that the duty is 1% or more and 20% or less; a second irradiation step of irradiating the second ink adhered to the recording medium with radiation to cure the second ink and obtain a recording medium; and a lamination step of laminating the recording medium so that the recording surface to which the first ink and the second ink are adhered and the non-recording surface to which the first ink and the second ink are not adhered face each other.

[0010] In this embodiment, the second ink laminated on the cured coating film of the first ink is adhered so that the duty is 1 % or more and 20% or less, whereby unevenness corresponding to the duty can be formed on the recording surface. Therefore, when the surface of the recording medium to which the ink adheres (hereinafter also referred to as the "recording surface") and the surface to which the ink does not adhere (hereinafter also referred to as the "non-recording surface") are laminated, the contact area is reduced, and it is possible to suppress the recording surface and the non-recording surface from being in perfect close contact. As a result, the peelability between the recording surface and the non-recording surface is improved, and it is possible to suppress the recording surface from leaving marks or a part of the ink layer from adhering to the non-recording surface. In addition, by adjusting the duty of the second ink within the above range, it is possible to further reduce the influence of the unevenness on the image quality, and the change in the texture of the recording medium obtained by the first ink tends to be more suppressed. Hereinafter, each step of the method for manufacturing the recording medium of this embodiment and the ink and the like used will be described in detail.

[0011] First, before explaining each step, the recording apparatus that can be used in the method for manufacturing the recording medium of this embodiment will be described with reference to FIG. 1. FIG. 1 shows a schematic diagram of the recording apparatus that can be used in this embodiment. As shown in FIG. 1, the recording apparatus 1 includes a first inkjet head 2 that discharges the first ink, a second inkjet head 3 that discharges the second ink, and a transport mechanism 5 for the recording medium. The first inkjet head 2 may have heads 2a to 2d for each type of ink, for example, as shown in the figure. Further, downstream of each of the heads 2a to 2d, the recording medium 6 is attached

[0012] to the recording medium.

[0013] ​​​​​​​​​​​Light sources 4a to 4d for curing the remarkable first ink are provided.

[0014] Further, the second inkjet head 3 is, for example, the head 3 for attaching the second ink a, and downstream thereof, a light source 4e for curing the second ink attached to the recording medium 6 is provided therein.

[0015] The conveyance mechanism 5 of the recording medium has, for example, a feed-out roller 51 and a take-up roller 52, and feeds out the recording medium from the feed-out roller 51 in the conveyance direction F, and the take-up roller 52 takes up the recording medium after recording to form a wound body. At this time, the recording surface and the non-recording surface of the recorded matter come into contact within the wound body. From the feed-out roller 51, the recording medium is fed out in the conveyance direction F, and the take-up roller 52 takes up the recording medium after recording to form a wound body. At this time, the recording surface and the non-recording surface of the recorded matter come into contact within the wound body.

[0016] 1.1. First ejection step The first ejection step is a step of ejecting the first ink, which is a radiation-curable inkjet composition, from the first ink jet head 2 and attaching it to the recording medium 6. More specifically, The pressure generating means is driven to eject the composition filled in the pressure generating chamber of the inkjet head from the nozzle. Such an ejection method is also called an inkjet method.

[0017] In the first ejection step and the second ejection step described later, the inkjet heads 2 and 3 used include a line head that performs recording by a line method and a serial head that performs recording by a serial method.

[0018] In the line method using a line head, for example, an inkjet head having a width equal to or greater than the recording width of the recording medium is fixed to the recording apparatus. Then, the recording medium is moved along the sub-scanning direction (the longitudinal direction of the recording medium, the conveyance direction), and in conjunction with this movement, the nozzles of the inkjet head are caused to eject ink droplets. longitudinal direction, conveyance direction) of the recording medium, and in conjunction with this movement, the nozzles of the inkjet head ​​By ejecting ink droplets from the nozzles, an image is recorded on the recording medium.

[0019] In a serial method using a serial head, for example, an inkjet head is mounted on a carriage that can move in the width direction of the recording medium. Then, the carriage is moved along the main scanning direction (the lateral direction, width direction of the recording medium), and ink droplets are ejected from the nozzle openings of the head in conjunction with this movement, so that an image can be recorded on the recording medium. Among these, from the viewpoint of winding up the recording medium to which ink is attached, it is preferable to use the line method in the first ejection step and the second ejection step described later. In the case of the line method, while continuously feeding the recording medium in the sub-scanning direction, continuous recording and radiation irradiation are performed by a line head, and the recording medium to which ink is attached is wound up downstream. Note that the form of the recording apparatus shown in FIG. 1 is the line method. The adhesion mode such as the duty of the first ink in the first ejection step is not particularly limited and can be appropriately adjusted according to the target image. In the manufacturing method of the recording object of the present embodiment, it is preferable that the first ink is a color ink and the second ink is a clear ink. Thereby, after attaching the first ink which is a color ink, by attaching the second ink which is a clear ink, the peelability between the recording surface and the non-recording surface having the image formed by the first ink is improved, and it is possible to suppress the occurrence of traces on the recording surface or the adhesion of a part of the ink layer to the non-recording surface.

[0020] Among these, from the viewpoint of winding up the recording medium to which ink is attached, it is preferable to use the line method in the first ejection step and the second ejection step described later. In the case of the line method, while continuously feeding the recording medium in the sub-scanning direction, continuous recording and radiation irradiation are performed by a line head, and the recording medium to which ink is attached is wound up downstream. Note that the form of the recording apparatus shown in FIG. 1 is the line method. In the manufacturing method of the recording object of the present embodiment, it is preferable that the first ink is a color ink and the second ink is a clear ink. Thereby, after attaching the first ink which is a color ink, by attaching the second ink which is a clear ink, the peelability between the recording surface and the non-recording surface having the image formed by the first ink is improved, and it is possible to suppress the occurrence of traces on the recording surface or the adhesion of a part of the ink layer to the non-recording surface.

[0021] The adhesion mode such as the duty of the first ink in the first ejection step is not particularly limited and can be appropriately adjusted according to the target image.

[0022] In the manufacturing method of the recording object of the present embodiment, it is preferable that the first ink is a color ink and the second ink is a clear ink. Thereby, after attaching the first ink which is a color ink, by attaching the second ink which is a clear ink, the peelability between the recording surface and the non-recording surface having the image formed by the first ink is improved, and it is possible to suppress the occurrence of traces on the recording surface or the adhesion of a part of the ink layer to the non-recording surface.

[0023] ​​​​Here, the "clear ink" corresponds to the color ink used for coloring the recording medium and is a concept referring to ink that is not for the purpose of coloring. Specifically, the clear ink preferably has a coloring material content of less than 0.2% by mass, and more preferably refers to an ink composition that does not contain a coloring material. On the other hand, the color ink is the ink used for coloring the recording medium, and preferably refers to those with a coloring material content of 0.2% by mass or more.

[0024] Furthermore, in the method for manufacturing the recording object of this embodiment, before the first ejection step, there may be other ejection steps and other irradiation steps. For example, as the other ejection step and irradiation step, white ink is attached to the recording object and cured, and the first ejection step may be performed on the white ink layer Thereby, a concealment layer or the like can be formed, and a recording object with good color development can be obtained when viewed from the recording surface side.

[0025] As another aspect, for example, as the other ejection step and irradiation step, a colored ink is attached to the recording object and cured to form an image, and the first ejection step may be performed on the colored ink layer to attach and cure white ink. Thereby, a concealment layer or the like can be formed, and a recording object with good color development can be obtained when the transparent recording medium is viewed from the non-recording surface side.

[0026] As the recording medium, a non-absorbent recording medium is preferred. In particular, for the recording medium used in this embodiment, both the recording surface and the non-recording surface are preferably non-absorbent. By using such a recording medium, a recording object suitable for label applications or the like can be obtained. Also, since it is non-absorbent, the cured coating film of the ink adheres easily to the non-recording surface, so the second The unevenness formed by the ink acts more effectively, and the peelability of the recording material tends to be further improved. There is.

[0027] The non-absorbent recording medium is not particularly limited. For example, films and plates of plastics such as polyvinyl chloride, polyethylene, propylene, polyethylene terephthalate (PET), polycarbonate, polystyrene, polyurethane, etc.; plates of metals such as iron, silver, copper, aluminum, etc.; or metal plates and plastic films manufactured by vapor deposition of various metals thereof, plates of alloys such as stainless steel and true casting; recording media obtained by adhering ( coating) films of plastics such as polyvinyl chloride, polyethylene, polypropylene, polyethylene terephthalate (PET), polycarbonate, polystyrene, polyurethane, etc. to a paper substrate, etc. are mentioned. In this embodiment, non-absorbent means that the water absorption amount from the start of contact to 30 msec in the Bristow method is 10 mL / m or less. Also, The non-absorbent recording medium refers to such a recording medium having non-absorbency. This Bristow method

[0028] is the most popular method as a method for measuring the liquid absorption amount in a short time, and is also adopted by the Japan Pulp and Paper Technology Association (JAPAN TAPPI). The details of the test method are described in the standard No. 51 of "JAPAN 2 TAPPI Pulp and Paper Test Methods 2000 Edition", "Paper and Paperboard - Liquid Absorption Test Method - Bristow Method". This method is the most popular method for measuring the liquid absorption amount in a short time and is also adopted by the Japan Pulp and Paper Technology Association (JAPAN TAPPI). The details of the test method are described in the standard No. 51 of "JAPAN TAPPI Pulp and Paper Test Methods 2000 Edition", "Paper and Paperboard - Liquid Absorption Test Method - Bristow Method".

[0029] 1.2. First Irradiation Step In the first irradiation step, with respect to the first ink adhered to the recording medium 6, radiation is emitted from the light sources 4a to 4d This is a step of irradiating a line to obtain a cured coating film of the first ink. In the first irradiation step and the second irradiation step described later, radiation is irradiated onto the radiation-curable inkjet composition adhered to the recording medium. When the radiation is irradiated, the polymerization reaction of the monomer starts, and the composition hardens to form a coating film. At this time, when a polymerization initiator is present, active species (initiating species) such as radicals, acids, and bases are generated, and the polymerization reaction of the monomer is promoted by the function of the initiating species. Here, examples of the radiation include ultraviolet rays, infrared rays, visible rays, X-rays, etc. The radiation source irradiates the composition by a radiation source provided downstream of the inkjet head. The radiation source is not particularly limited, and for example, a UV-LED can be mentioned. By using such a radiation source, miniaturization of the apparatus and cost reduction can be realized. Since the UV-LED as an ultraviolet ray source is small, it can be installed in the inkjet recording apparatus. 1.3. Second ejection step The second ejection step is a step of ejecting the second ink, which is a radiation-curable inkjet composition, from the second inkjet head 3 and adhering it onto the cured coating film of the first ink so that the Duty is within a predetermined range. The Duty in the second ejection step is 1% or more and 20% or less, preferably 3% or more and 18% or less, and more preferably 6% or more and 15% or less. When the Duty is 1% or more, the peelability between the recording surface and the non-recording surface is improved, and it is possible to suppress the occurrence of marks on the recording surface or the adhesion of a part of the ink layer to the non-recording surface. Also, when the Duty is 20% or less, the influence of unevenness on the image quality can be reduced more. When the radiation is irradiated, the polymerization reaction of the monomer starts, and the composition hardens to form a coating film. At this time, when a polymerization initiator is present, active species (initiating species) such as radicals, acids, and bases are generated, and the polymerization reaction of the monomer is promoted by the function of the initiating species. Here, examples of the radiation include ultraviolet rays, infrared rays, visible rays, X-rays, etc. The radiation source irradiates the composition by a radiation source provided downstream of the inkjet head. The radiation source is not particularly limited, and for example, a UV-LED can be mentioned. By using such a radiation source, miniaturization of the apparatus and cost reduction can be realized. Since the UV-LED as an ultraviolet ray source is small, it can be installed in the inkjet recording apparatus.

[0030] Here, examples of the radiation include ultraviolet rays, infrared rays, visible rays, X-rays, etc. The radiation source irradiates the composition by a radiation source provided downstream of the inkjet head. The radiation source is not particularly limited, and for example, a UV-LED can be mentioned. By using such a radiation source, miniaturization of the apparatus and cost reduction can be realized. Since the UV-LED as an ultraviolet ray source is small, it can be installed in the inkjet recording apparatus. The radiation source irradiates the composition by a radiation source provided downstream of the inkjet head. The radiation source is not particularly limited, and for example, a UV-LED can be mentioned. By using such a radiation source, miniaturization of the apparatus and cost reduction can be realized. Since the UV-LED as an ultraviolet ray source is small, it can be installed in the inkjet recording apparatus. The radiation source is not particularly limited, and for example, a UV-LED can be mentioned. By using such a radiation source, miniaturization of the apparatus and cost reduction can be realized. Since the UV-LED as an ultraviolet ray source is small, it can be installed in the inkjet recording apparatus. By using such a radiation source, miniaturization of the apparatus and cost reduction can be realized. Since the UV-LED as an ultraviolet ray source is small, it can be installed in the inkjet recording apparatus. Since the UV-LED as an ultraviolet ray source is small, it can be installed in the inkjet recording apparatus. 1.3. Second ejection step

[0031] 1.3. Second ejection step The second ejection step is a step of ejecting the second ink, which is a radiation-curable inkjet composition, from the second inkjet head 3 and adhering it onto the cured coating film of the first ink so that the Duty is within a predetermined range. The second ejection step is a step of ejecting the second ink, which is a radiation-curable inkjet composition, from the second inkjet head 3 and adhering it onto the cured coating film of the first ink so that the Duty is within a predetermined range. The Duty in the second ejection step is 1% or more and 20% or less, preferably 3% or more and 18% or less, and more preferably 6% or more and 15% or less. The Duty in the second ejection step is 1% or more and 20% or less, preferably 3% or more and 18% or less, and more preferably 6% or more and 15% or less. When the Duty is 1% or more, the peelability between the recording surface and the non-recording surface is improved, and it is possible to suppress the occurrence of marks on the recording surface or the adhesion of a part of the ink layer to the non-recording surface. When the Duty is 1% or more, the peelability between the recording surface and the non-recording surface is improved, and it is possible to suppress the occurrence of marks on the recording surface or the adhesion of a part of the ink layer to the non-recording surface. Also, when the Duty is 20% or less, the influence of unevenness on the image quality can be reduced more. This becomes possible, and there is a tendency to further suppress the change in the texture of the recorded matter obtained with the first ink. It is.

[0032] In addition, in this embodiment, "Duty" is a value calculated by the following formula and means the amount of ink adhering to a pixel. Here, when Duty is 1% or more and 20% or less, it means that the number of actually printed dots is 1 to 20% in a predetermined pixel (vertical resolution × horizontal resolution). This means. It is. Duty (%) = Number of actually printed dots / (Vertical resolution × Horizontal resolution) × 100 (In the formula, "Number of actually printed dots" is the number of actually printed dots per unit area, and "Vertical resolution" and "Horizontal resolution" are the resolutions per unit area, respectively.)

[0033] 1.4. Second irradiation step The second irradiation step is a step of irradiating the second ink adhering to the recording medium 6 with radiation from the light source 4e to cure the second ink and obtain a recorded matter. As a result, the second ink adhering on the cured coating film of the first ink can be cured, and unevenness corresponding to the Duty adhered in the second discharge step can be formed. Regarding the irradiation of radiation, it can be the same as the first irradiation step. It is. The second ink adhering on the cured coating film of the first ink can be cured, and unevenness corresponding to the Duty adhered in the second discharge step can be formed. Regarding the irradiation of radiation, it can be the same as the first irradiation step. It is. Regarding the irradiation of radiation, it can be the same as the first irradiation step. It is possible to do the same as in the first irradiation step.

[0034] 1.5. Laminating step The laminating step is a step of stacking the recorded matter so that the recording surface to which the first ink and the second ink adhere and the non-recording surface to which the first ink and the second ink do not adhere face each other. It is.

[0035] The stacking method in the laminating step is not particularly limited. For example, in addition to stacking single-sheet recorded matters one by one so that the recording surface and the non-recording surface face each other, for a long recording medium, continuously stacking them so that the recording surface and the non-recording surface face each other, or Subsequently, the recorded material is wound into a roll downstream of the recording apparatus, and the recording surfaces and non-recording surfaces are stacked so as to face each other. More specifically, by winding with the take-up roller 52, the recording material can be made into a wound body. In this wound body, the recording material is wound while the recording surfaces and non-recording surfaces are stacked so as to face each other.

[0036] By winding in this roll shape, the recording surfaces and non-recording surfaces inside the roll are strongly pressed against each other, and also rub against each other when being rolled. Therefore, the present invention that can improve the peelability between the recording surface and the non-recording surface and suppress the recording surface from leaving marks or a part of the ink layer from adhering to the non-recording surface is particularly useful.

[0037] 1.6. First Ink and Second Ink Both the first ink and the second ink used in this embodiment are radiation-curable inkjet compositions. Hereinafter, the first ink and the second ink will be described in detail. When there is no need to distinguish between the first ink and the second ink, they are collectively simply referred to as "ink", and when particularly referring to the constitution of the first ink or the second ink, the object is specified.

[0038] The ink is not particularly limited as long as it is a radiation-curable inkjet composition. In this embodiment, the radiation-curable inkjet composition refers to a composition that cures by irradiating radiation. Examples of the radiation include ultraviolet rays, electron beams, infrared rays, visible light rays, X-rays, and the like. Among these, ultraviolet rays are preferable in terms of the radiation source being easily available and widely used, and materials suitable for curing by ultraviolet radiation being easily available and widely used. ​

[0039] The ink is not particularly limited, and for example, it may contain a polymerizable compound, a photoinitiator, a polymerization inhibitor, a slip agent, a coloring material, a dispersant, etc. As described above, it is preferable that the first ink is a calender ink and the second ink is a clear ink. Hereinafter, each component will be described in detail.

[0040] 1.6.1. Polymerizable compound The polymerizable compound includes a monofunctional monomer and, if necessary, may include a polyfunctional monomer.

[0041] 1.6.1.2. Monofunctional monomer The monofunctional monomer is not particularly limited, and examples thereof include a monofunctional monomer having an alicyclic group, a monofunctional monomer having an aromatic group, and a monofunctional monomer having a nitrogen-containing heterocycle. In addition, monomers other than these may be used as the monofunctional monomer.

[0042] By using the monofunctional monomer, as described above, the adhesion is improved and there is an advantage that a recording material excellent in stretchability can be obtained. On the other hand, when the recording surface formed by the ink with high adhesion and the non-recording surface are laminated, the peelability tends to decrease due to the high adhesion, and scratches are likely to occur. Therefore, from the viewpoint of obtaining a recording material that takes advantage of the characteristics of the monofunctional monomer and has excellent peelability and is difficult to leave scratches, the present invention is particularly useful. In particular, when the first ink contains a monofunctional monomer, the content of the monofunctional monomer is preferably 80% by mass or more, more preferably 85 to 99% by mass, and still more preferably 90 to 98% by mass, based on the total amount of the polymerizable compound in the first ink. Monofunctional mono

[0043] ​ Since the content of the mar is 80% by mass or more, the adhesion and curing of the ink layer and the recording medium tend to be further improved. tend to be further improved.

[0044] Further, when the second ink contains a monofunctional monomer, the content of the monofunctional monomer is preferably 80% by mass or more, more preferably 85 to 99% by mass, and still more preferably 90 to 98% by mass with respect to the total amount of the polymerizable compounds in the second ink. Since the content of the monofunctional monomer is 80% by mass or more, the adhesion and curability between the coating film of the first ink and the coating film of the second ink tend to be further improved. Further, since the coating film of the second ink becomes flexible, it is easy to prevent the recording material from being damaged when the laminated recording material is processed and used. Since the content of the monofunctional monomer is 80% by mass or more, the adhesion and curability between the coating film of the first ink and the coating film of the second ink tend to be further improved. Further, since the coating film of the second ink becomes flexible, it is easy to prevent the recording material from being damaged when the laminated recording material is processed and used. tend to be further improved. Further, since the coating film of the second ink becomes flexible, it is easy to prevent the recording material from being damaged when the laminated recording material is processed and used. Since the content of the monofunctional monomer is 80% by mass or more, the adhesion and curability between the coating film of the first ink and the coating film of the second ink tend to be further improved. Further, since the coating film of the second ink becomes flexible, it is easy to prevent the recording material from being damaged when the laminated recording material is processed and used. tend to be further improved. Further, since the coating film of the second ink becomes flexible, it is easy to prevent the recording material from being damaged when the laminated recording material is processed and used. tend to be further improved. Further, since the coating film of the second ink becomes flexible, it is easy to prevent the recording material from being damaged when the laminated recording material is processed and used. become.

[0045] 1.6.1.2.1. Monofunctional Monomers Having an Alicyclic Group The monofunctional monomer having an alicyclic group is not particularly limited. For example, dicyclopentenyl (meth) acrylate, dicyclopentenyl oxyethyl (meth) acrylate, dicyclopentanyl (meth) acrylate, 3,3,5-trimethylcyclohexyl (meth) acrylate, isobornyl (meth) acrylate, tert-butylcyclohexanol (meth) acrylate, 2-(meth) acrylic acid-1,4-dioxaspiro [4,5] dec-2-ylmethyl and other alicyclic group-containing (meth) acrylates can be mentioned. dicyclopentenyl oxyethyl (meth) acrylate dicyclopentanyl (meth) acrylate, 3,3,5-trimethylcyclohexyl (meth) acrylate acrylate, isobornyl (meth) acrylate, tert-butylcyclohexanol (meth) acrylate, 2-(meth) acrylic acid-1,4-dioxaspiro [4,5 dec-2-ylmethyl and other alicyclic group-containing (meth) acrylates can be mentioned.

[0046] Among these, dicyclopentenyl (meth) acrylate (DCPA) and isobornyl acrylate (IBXA) are preferable. By using such monomers, the adhesion and abrasion resistance of the obtained coating film tend to be further improved. By using such monomers, the adhesion and abrasion resistance of the obtained coating film tend to be further improved. tend to be further improved.

[0047] The content of the monofunctional monomer having an alicyclic group is preferably 25 to 55% by mass, more preferably 30 to 50% by mass, still more preferably 35 to 45% by mass, With the content of the monofunctional monomer having an alicyclic group within the above range, the adhesion and abrasion resistance of the resulting coating film tend to be further improved.

[0048] 1.6.1.2.2. Monofunctional Monomer Having an Aromatic Group The monofunctional monomer having an aromatic group is not particularly limited. For example, phenoxyethyl (meth)acrylate, benzyl (meth)acrylate, alkoxylated 2-phenoxy ethyl (meth)acrylate, ethoxylated nonylphenyl (meth)acrylate, alk oxylated nonylphenyl (meth)acrylate, p-cumylphenol EO-modified (meth) acrylate, and 2-hydroxy-3-phenoxypropyl (meth)acrylate can be mentioned. Among these, phenoxyethyl acrylate (PEA) is preferred. By using such an aromatic

[0049] group-containing monofunctional monomer, the solubility of the photoinitiator is further improved, and the curability of the ink tends to be further improved. In particular, when an acylphosphine oxide-based photoinitiator or a thioxanthone-based photoinitiator is used, its solubility tends to be good. .

[0050] The content of the monofunctional monomer having an aromatic group is preferably 20 to 50% by mass, more preferably 25 to 45% by mass, still more preferably 28 to 40% by mass. When the content of the aromatic group-containing monofunctional monomer is within the above range, The adhesion and abrasion resistance of the coating film tend to be further improved.

[0051] 1.6.1.2.3. Nitrogen-containing monofunctional monomer The nitrogen-containing monofunctional monomer is not particularly limited. For example, nitrogen-containing monofunctional vinyl monomers such as N-vinylcaprolactam, N-vinylformamide, N-vinylcarbazole, N-vinylacetamide, and N-vinylpyrrolidone; nitrogen-containing monofunctional acrylate monomers such as acryloylmorpholine, (meth)acrylamide, N-hydroxymethyl(meth)acrylamide, diacetoneacrylamide, N,N-dimethyl(meth)acrylamide, and nitrogen-containing monofunctional acrylamide monomers such as dimethylaminoethyl acrylate benzyl chloride quaternary salt. (meth)acrylamide, etc. Among these, monomers having a nitrogen-containing heterocyclic structure such as N-vinylcaprolactam, N-vinylcarbazole, N-vinylpyrrolidone, or acryloylmorpholine are more

[0052] preferred, and it is more preferred to contain acryloylmorpholine (ACMO). By using such a nitrogen-containing monofunctional monomer, the abrasion resistance of the coating film tends to be further improved. Furthermore, nitrogen-containing monofunctional acrylate monomers having a nitrogen-containing heterocyclic structure such as acryloylmorpholine tend to further improve the stretchability and adhesion of the coating film. Preferably, the content of the nitrogen-containing monofunctional monomer is 10 to 25% by mass, more preferably 12.5 to 22.5% by mass, and still more preferably 15 to 20% by mass with respect to the total amount of the polymerizable compounds. When the content of the nitrogen-containing monofunctional monomer is within the above range, the abrasion resistance of the coating film tends to be further improved.

[0053] the stretchability and adhesion of the coating film tend to be further improved. 25% by mass, more preferably 12.5 to 22.5% by mass, and still more preferably 15 to 20% by mass. When the content of the nitrogen-containing monofunctional monomer is within the above range, The abrasion resistance and adhesion of the coating film tend to be further improved.

[0054] 1.6.1.3. Polyfunctional Monomer The polyfunctional monomer is not particularly limited, and examples thereof include vinyl group-containing (meth)acrylate and polyfunctional (meth)acrylate.

[0055] 1.6.1.3.1. Vinyl Group-Containing (Meth)acrylate The vinyl group-containing (meth)acrylate is not particularly limited, and examples thereof include a compound represented by the formula (1) H2C=CR 1 -CO-OR 2 -O-CH=CH-R 3 ··· (1) (In the formula, R 1 is a hydrogen atom or a methyl group, and R 2 is a divalent organic residue having 2 to 20 carbon atoms and R 3 is a hydrogen atom or a monovalent organic residue having 1 to 11 carbon atoms.)

[0056] In the above formula (1), as the divalent organic residue having 2 to 20 carbon atoms represented by R 2 , there are linear, branched or cyclic alkylene groups having 2 to 20 carbon atoms, which may be substituted, and oxygen atoms due to ether bonds and / or ester bonds in the structure , an alkylene group having 2 to 20 carbon atoms which may be substituted, a divalent aromatic group having 6 to 11 carbon atoms which may be substituted

[0057] Among these, alkylene groups having 2 to 6 carbon atoms such as ethylene group, n-propylene group, isopropylene group, and butylene group , oxyethylene group, oxy n-propylene group, oxy isopropylene group, and oxygen atoms due to ether bonds in structures such as oxybutylene group ​​​​An alkylene group having 2 to 9 carbon atoms is preferred. Further, from the viewpoint of making the composition have a lower viscosity and further improving the curability of the composition, R 2 is an oxyethylene group, oxy n-propylene group, oxyisopropylene group, or an alkylene group having 2 to 9 carbon atoms having an oxygen atom due to an ether bond in its structure such as an oxybutylene group. A compound having a glycol ether chain is more preferred. In the above formula (1), as the monovalent organic residue having 1 to 11 carbon atoms represented by R

[0058] is preferably a linear, branched or cyclic, optionally substituted alkyl group having 1 to 10 carbon atoms, or an optionally substituted aromatic group having 6 3 to 11 carbon atoms. Among these, an alkyl group having 1 to 2 carbon atoms such as a methyl group or an ethyl group, or an aromatic group having 6 to 8 carbon atoms such as a phenyl group and a benzyl group are preferably used.

[0059] Among these, an alkyl group having 1 to 2 carbon atoms such as a methyl group or an ethyl group, an aromatic group having 6 to 8 carbon atoms such as a phenyl group and a benzyl group are preferably used.

[0060] Specific examples of the compound of formula (1) are not particularly limited. For example, 2-(2-vinyloxyethoxy)ethyl (meth)acrylate can be mentioned, and 2-(2-vinyloxy ethoxy)ethyl acrylate (VEEA) is preferred. In particular, the second ink preferably contains a vinyl group-containing

[0061] (meth)acrylate represented by the above formula (1) as a polyfunctional monomer. Thereby, the curability of the second ink tends to be further improved. (meth)acrylate represented by the above formula (1) as a polyfunctional monomer. Thereby, the curability of the second ink tends to be further improved. upward.

[0062] The content of the vinyl group-containing (meth)acrylate is preferably 1 to 25% by mass, more preferably 2 to 20% by mass, and still more preferably 3 It is ~15% by mass. When the content of the nitrogen-containing monofunctional monomer is within the above range, the viscosity of the ink decreases, and the ejection stability tends to be further improved.

[0063] 1.6.1.3.2 Polyfunctional (meth)acrylate The polyfunctional (meth)acrylate is not particularly limited. For example, dipropylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, tri ethylene glycol di(meth)acrylate and other difunctional (meth)acrylates; trimethyl ol propane tri(meth)acrylate, EO-modified trimethylolpropane tri(meth )acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate and other polyfunctional (meth)acrylates having three or more functional groups can be mentioned. include.

[0064] Among these, dipropylene glycol diacrylate (DPGDA) is preferred. By using such a polyfunctional (meth)acrylate, the curability and abrasion resistance of the ink tend to be further improved. tend to be further improved.

[0065] The content of the polyfunctional (meth)acrylate is preferably 1 .0 to 10% by mass or more, more preferably 2.0 to 8.0% by mass, and even more preferably 3.0 to 7.0% by mass with respect to the total amount of the polymerizable compounds. When the content of the polyfunctional (meth)acrylate is within the above range the curability and abrasion resistance of the ink tend to be further improved.

[0066] 1.6.2. Photoinitiator The photoinitiator is not particularly limited as long as it generates active species by irradiating radiation. Although not limited, for example, known photoinitiators such as acylphosphine oxide-based photoinitiators, alkylphenone-based polymerization initiators, titanocene-based polymerization initiators, thioxanthone-based photoinitiators, etc. can be mentioned. Among these, acylphosphine oxide-based photoinitiators are preferred. By using such a photoinitiator, the curability of the ink is improved, and particularly, the curability by the curing process using the light of UV-LED tends to be further improved. The photoinitiator may be used alone or in combination of two or more. Known photoinitiators such as acylphosphine oxide-based photoinitiators, alkylphenone-based polymerization initiators, titanocene-based polymerization initiators, thioxanthone-based photoinitiators, etc. can be mentioned. Among these, acylphosphine oxide-based photoinitiators are preferred. By using such a photoinitiator, the curability of the ink is improved, and particularly, the curability by the curing process using the light of UV-LED tends to be further improved. The photoinitiator may be used alone or in combination of two or more. The photoinitiator may be used alone or in combination of two or more.

[0067] The acylphosphine oxide-based photoinitiator is not particularly limited. For example, , 2,4,6-trimethylbenzoyldiphenylphosphine oxide, bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide, bis-(2,6-dimethoxybenzoyl)-2,4,4-trimethylpentylphosphine oxide, etc. can be mentioned. , 2,4,6-trimethylbenzoyldiphenylphosphine oxide, bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide, bis-(2,6-dimethoxybenzoyl)-2,4,4-trimethylpentylphosphine oxide, etc. can be mentioned. , 2,4,6-trimethylbenzoyldiphenylphosphine oxide, bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide, bis-(2,6-dimethoxybenzoyl)-2,4,4-trimethylpentylphosphine oxide, etc. can be mentioned. can be mentioned.

[0068] Commercially available products of such acylphosphine oxide-based photoinitiators include, for example, IRGACURE 819 (bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide), IRGACURE 1800 (a mixture of bis-(2,6-dimethoxybenzoyl)-2,4,4-trimethylpentylphosphine oxide and 1-hydroxy-cyclohexyl-phenyl ketone in a mass ratio of 25:75), IRGACURE TPO (2,4,6-trimethylbenzoyldiphenylphosphine oxide) (all of the above are manufactured by BASF), etc. can be mentioned. can be mentioned. can be mentioned. can be mentioned. can be mentioned.

[0069] The content of the photoinitiator is preferably 3.0 to 15% by mass, more preferably 5.0 to 13.5% by mass, and still more preferably 8.0 to 12% by mass, based on the total amount of the ink. When the content of the photoinitiator is within the above range, the curability of the ink and the solubility of the photoinitiator tend to be further improved. Preferably, it is, more preferably it is, and still more preferably it is. When the content of the photoinitiator is within the above range, the curability of the ink and the solubility of the photoinitiator tend to be further improved.

[0070] 1.6.3. Polymerization inhibitor Examples of the polymerization inhibitor include, but are not limited to, p-methoxyphenol, hydroquinone monomethyl ether (MEHQ), 4-hydroxy-2,2,6,6-tetramethylpiperidine-N-oxyl, hydroquinone, cresol, t-butylcatechol, 3,5-di-t-butyl-4-hydroxytoluene, 2,2'-methylenebis(4-methyl-6-t-butylphenol), 2,2'-methylenebis(4-ethyl-6-butylphenol), 4,4'-thiobis(3-methyl-6-t-butylphenol), and hindered amine compounds. The polymerization inhibitor may be used alone or in combination of two or more. Examples of the polymerization inhibitor include, but are not limited to, p-methoxyphenol, hydroquinone monomethyl ether (MEHQ), 4-hydroxy-2,2,6,6-tetramethylpiperidine-N-oxyl, hydroquinone, cresol, t-butylcatechol, 3,5-di-t-butyl-4-hydroxytoluene, 2,2'-methylenebis(4-methyl-6-t-butylphenol), 2,2'-methylenebis(4-ethyl-6-butylphenol), 4,4'-thiobis(3-methyl-6-t-butylphenol), and hindered amine compounds. The polymerization inhibitor may be used alone or in combination of two or more.

[0071] The content of the polymerization inhibitor is preferably 0.05 to 1.0% by mass, more preferably 0.05 to 0.5% by mass, based on the total amount of the ink. Preferably, it is, and more preferably it is.

[0072] 1.6.4. Slip agent As the slip agent, a silicone-based surfactant is preferred, and more preferably a polyester-modified silicone or a polyether-modified silicone. Examples of the polyester-modified silicone include BYK-347, 348, BYK-UV3500, 3510, 3530. Preferably, it is, and more preferably it is. Examples of the polyester-modified silicone include BYK-347, 348, BYK-UV3500, 3510, 3530. ​​​​​​​(Above are products made by BYK Additives&Instruments Co., Ltd.) etc., polyether-modified silicone Examples of the polyether-modified silicone include BYK-3570 (manufactured by BYK Additives&Instruments Co., Ltd.) etc. The slip agent may be used alone or in combination of two or more kinds.

[0073] The content of the slip agent is preferably 0.01 to 2.0% by mass, more preferably 0.05 to 1.0% by mass, based on the total amount of the ink.

[0074] 1.6.5. Colorant As the colorant, at least one of a pigment and a dye can be used.

[0075] In the case of color ink, the total content of the colorant is preferably 0.2 to 20% by mass, more preferably 0.5 to 15% by mass, still more preferably 1.0 to 10% by mass, based on the total amount of the ink. In the case of clear ink, as described above, it is preferable that the colorant is not contained, and even if it is unavoidably contained, it is less than 0.2% by mass.

[0076] 1.6.6. Dispersant The dispersant is not particularly limited. For example, dispersants commonly used for preparing pigment dispersion liquids such as polymer dispersants can be mentioned. Specific examples thereof include polyoxyalkylene polyalkylenepolyamine, vinyl-based polymers and copolymers, acrylic-based polymers and copolymers, polyesters, polyamides, polyimides, polyurethanes, amino-based polymers, silicon-containing polymers, sulfur-containing polymers, fluorine-containing polymers, and those having one or more of epoxy resins as the main component. The dispersant may be used alone or in combination of two or more kinds. ​

[0077] As commercially available polymer dispersants, there are the AJISPER series manufactured by Ajinomoto Fine-Techno Co., Inc., Ave the Solsperse series (such as Solsperse 36000) available from Avecia or Noveon, the DISPERBYK series manufactured by BYK Additives & Instruments, and the DISPARON series manufactured by Kusumoto Chemicals, Ltd. can be cited.

[0078] The content of the dispersant is preferably 0.1 to 2.0% by mass, more preferably 0.1 to 1.0% by mass, and even more preferably 0.1 to 0.5% by mass with respect to the total amount of the ink.

[0079] 2. Recording Medium Fig. 2 shows a schematic cross-sectional view of the recording medium 5 in this embodiment. As shown in Fig. 2, the recording medium 7 of this embodiment has a recording surface 61 to which the first ink 71 and the second ink 72 are attached, and a non-recording surface 62 to which the first ink 71 and the second ink 72 are not attached, and on the recording surface 61 of the recording medium 6, the first ink 71 is attached, and further, the second ink 72 is attached on the first ink 71 at a relatively low duty. For example, after attaching the first ink 71, which is a color ink, as a solid image or the like, by attaching the second ink 72, which is a clear ink, at a low duty, the peelability between the recording surface 61 having the image formed by the first ink 71 and the non-recording surface 62 is improved, and it is possible to suppress

[0080] the recording surface 61 from leaving a mark or a part of the first ink 71 or the second ink 72 from adhering to the non-recording surface 62.

[0081] The recording medium 6 used in the recording material 7 in this embodiment is a long one as shown in FIG. 1 and the recording material 7 is preferably stored as a wound body wound by a roller. In this way when stored, the recording surface 61 and the non-recording surface 62 of the recording material 7 come into contact, but the contact area between the recording surface 61 and the non-recording surface 62 is reduced by the second ink 72. Therefore, when the recording material 7 is used as a label or the like, even if it is unwound from the wound body, no trace remains on the recording surface 61 or a part of the first ink 71 or the second ink 72 adheres to the non-recording surface 62 can be suppressed. In particular, from the viewpoint of improving the adhesion of the image layer formed by the first ink 71 to the recording medium 6 and the followability , when a large amount of monofunctional monomer is used for the first ink 71, the adhesion between the recording surface 61 and the non-recording surface 62 is also improved, and problems such as trace remaining and peeling are likely to occur. However

[0082] for the recording material 7 of this embodiment, since it is possible to reduce the adhesion between the recording surface 61 and the non-recording surface 62 by the second ink 72, it is possible to suppress trace remaining and peeling.

Examples

[0083]

[0084] Hereinafter, the present invention will be described more specifically using examples and comparative examples. The present invention is not limited by the following examples

[0084] 1. Preparation of inkjet composition First, a colorant, a dispersant, and a part of each monomer are weighed and put into a tank for pigment dispersion. A ceramic bead mill with a diameter of 1 mm is put into the tank and stirred to disperse the colorant in the monomer to obtain a pigment dispersion liquid.

[0085] ​Next, in a stainless steel container for the mixture, which is a tank, so as to have the composition shown in Table 1, the remaining monomers, polymerization initiator, and polymerization inhibitor were put in, mixed and stirred until completely dissolved, and then the pigment dispersion obtained above was added, and further mixed and stirred at room temperature for 1 hour, and then filtered through a 5 μm membrane filter to obtain the radiation-curable inkjet composition of each example. In addition, the numerical values of each component shown in each example in the table represent mass% unless otherwise specified.

[0086]

Table 1

[0087] <Mono-functional monomer> ·ACMO (manufactured by KJ Chemicals Co., Ltd., acryloylmorpholine) ·PEA (trade name "Biscoat #192", manufactured by Osaka Organic Chemical Industry Co., Ltd., phenoxyethyl acrylate) ·DCPA (manufactured by Hitachi Chemical Co., Ltd., dicyclopentenyl acrylate) ·IBXA (manufactured by Osaka Organic Chemical Industry Co., Ltd., isobornyl acrylate) <Multi-functional monomer> ·VEEA (manufactured by Nippon Shokubai Co., Ltd., 2-(2-vinyloxyethoxy)ethyl acrylate) ·DPGDA (trade name "SR508", manufactured by Sartomer Co., Ltd., dipropylene glycol diacrylate) <Polymerization initiator> ·819 (trade name "IRGACURE 819", manufactured by BASF, bis(2,4,6-trimethyl benzoyl)-phenylphosphine oxide) ·TPO (trade name "IRGACURE TPO", manufactured by BASF, 2,4,6-trimethyl benzoyldiphenylphosphine oxide) <Polymerization inhibitor> ​· MEHQ (trade name "p-methoxyphenol", manufactured by Kanto Chemical Co., Inc., hydroquinone monomethyl ether) <Slip agent> · BYK-UV3500 (manufactured by BYK Additives&Instruments, polyether-modified polydimethylsiloxane having an acryloyl group) <Colorant (pigment)> · PB15:3 (trade name "C.I. Pigment Blue 15:3", manufactured by DIC, phthalocyanine blue) · PW6 (trade name "C.I. Pigment White 6", manufactured by Tica, titanium oxide) <Dispersant> · Solsperse36000 (manufactured by Lubrizol, polymeric dispersant)

[0088] In Table 1, the "content of the monofunctional monomer with respect to the total amount of the polymerizable compounds" represents the ratio (mass%) of the content of the monofunctional monomer with respect to the total amount of the polymerizable compounds.

[0089] 2. Evaluation method 2.1. Adhesion Using a printer equipped with an LED (modified model, product number PX-G5000, manufactured by Seiko Epson Corporation), each radiation-curable inkjet composition described in Table 1 was ejected onto a vinyl chloride film (JT5829R, manufactured by MACtac) at 20 ng / dot, 600 dpi × 600 dpi and cured to obtain a coating film with a thickness of 10 μm. Cuts were made in the obtained coating film and a transparent adhesive tape was attached to the cut portion, and the tape was rubbed sufficiently with a finger so that the coating film could be seen through. Next, within 5 minutes after attaching the tape, at an angle close to 60°, for 0.5 to 1.0 second , the tape was peeled off from the coating film. Based on the presence or absence of peeling of the coating film from the vinyl chloride film at this time, the adhesion was evaluated according to the following evaluation criteria. ​​​​​​(Evaluation Criteria) A: No peeling was observed. B: Partial peeling was observed. C: All peeled off.

[0090] 2.2. Hardening property Using a printer equipped with an LED (model number PX-G5000 modified machine, manufactured by Seiko Epson Corporation ), each radiation-curable inkjet composition described in Table 1 was applied onto a vinyl chloride film (JT5829R, manufactured by MACtac) so that the coating thickness was 10 μm. Then, for the inkjet composition, ultraviolet light with a central wavelength of 395 nm and 1000 mW / cm 2 was irradiated for a predetermined time, and the surface of the coating film was rubbed with a cotton swab. The hardening property was evaluated based on the irradiation energy at which the cotton swab did not get colored . Note that the irradiation energy [mJ / cm 2 was obtained from the product of the irradiation intensity [mW / c m 2 and the irradiation duration [s]. The evaluation criteria are as follows. (Evaluation Criteria) A: Irradiation energy is 200 mJ / cm 2 or less B: Irradiation energy exceeds 200 mJ / cm 2 and is 300 mJ / cm 2 or less C: Irradiation energy exceeds 300 mJ / cm 2

[0091] 2.3. Residual marks Using a printer equipped with an LED (model number PX-G5000 modified machine, manufactured by Seiko Epson Corporation ), each radiation-curable inkjet composition was adhered onto a vinyl chloride film (JT5829R, manufactured by MACtac) in the combinations described in Table 2 . At this time, the first ink in the lower layer was 20 ng / dot, 600 dpi × 600 dpi, Duty 100% ​as a target image, ultraviolet rays were irradiated so that the irradiation energy became 400 mJ / cm 2 to form a coating film. Also, the second ink that becomes the upper layer was overlapped and adhered to the coating film of the first ink. As the adhesion conditions, it was 20 ng / dot and 600 dpi × 600 dpi, and Du ty used the conditions described in Table 2. Also for the second ink, after the second ink was adhered, ultraviolet rays were irradiated so that the irradiation energy became 400 mJ / cm to obtain a recorded material. Note that only in Comparative Example 1, the adhesion of the second ink that becomes the upper layer was not performed, and the evaluation described later was performed. 2 As described above, with respect to the recording surface to which the first ink and the second ink of the recorded material obtained were adhered another vinyl chloride film that was not recorded was overlapped, and a load of 1 Kg was applied from above

[0092] and held for 10 minutes. Then, the recorded material and the other vinyl chloride film were peeled off, and it was visually confirmed whether or not the marks of the other vinyl chloride film were transferred to the recording surface. The evaluation criteria are as follows and are as follows. (Evaluation criteria) A: No transfer marks on the recording surface B: Slight transfer marks on the recording surface C: Obvious transfer marks on the recording surface D: Obvious transfer marks on the recording surface and color transfer on the back surface of the other vinyl chloride film

[0093] 2.4. Glossiness A recorded material was obtained in the same manner as the above-mentioned remaining marks. It was visually confirmed how far from the coating film the reflection of the fluorescent lamp could be visually confirmed on the obtained printed matter. The evaluation criteria are as follows and are as follows. (Evaluation criteria) A: It can be confirmed even when it is 50 cm or more away B: It can be confirmed if it is 30 cm or more and less than 50 cm C: It can be confirmed if it is less than 30 cm If C is less than 30 cm, it could be confirmed.

[0094]

Table 2

[0095] 3. Evaluation Results Table 2 shows the conditions of the recording method using each radiation-curable inkjet composition and the evaluation results. From Table 2, it was found that by applying the second ink at a predetermined duty, there was less residue, and the image quality (glossiness) of the first ink was maintained.

Claims

1. A first ejection step of ejecting a first ink, which is a radiation-curable inkjet composition, onto a recording medium and attaching it thereto ; and a first irradiation step of irradiating the first ink attached to the recording medium with radiation to obtain a cured coating film of the first ink ; a second ejection step of ejecting a second ink, which is a radiation-curable inkjet composition, onto the cured coating film of the first ink so that the duty is 1% or more and 20% or less ; a second irradiation step of irradiating the second ink attached to the recording medium with radiation to cure the second ink and obtain a recorded matter ; and a stacking step of stacking the recorded matter such that the recording surface to which the first ink and the second ink are attached and the non-recording surface to which the first ink and the second ink are not attached face each other ; and a method for manufacturing a recorded matter, comprising:

2. The method for manufacturing a recorded matter according to claim 1, wherein the first ink is a color ink

3. The method for manufacturing a recorded matter according to claim 1 or 2, wherein the second ink is a clear ink

4. The method for manufacturing a recorded matter according to any one of claims 1 to 3, wherein, in the stacking step, the recorded matter is wound into a roll to stack the recording surface and the non-recording surface so as to face each other

5. The method for manufacturing a recorded matter according to any one of claims 1 to 4, wherein both the recording surface and the non-recording surface of the recording medium are non-absorbent

6. The method for manufacturing a recorded matter according to any one of claims 1 to 5, wherein the first ink contains a polymerizable compound containing a monofunctional monomer, and the content of the monofunctional monomer is 80% by mass or more based on the total amount of the polymerizable compound

7. The method for manufacturing a recorded matter according to any one of claims 1 to 6, wherein the second ink contains a polymerizable compound containing a polyfunctional monomer, and the polyfunctional monomer contains a vinyl group-containing (meth)acrylate represented by the following formula (1)

8. The method for manufacturing a recorded matter according to any one of claims 1 to 7, wherein the polymerizable compound contained in the second ink contains a monofunctional monomer, and the content of the monofunctional monomer is 80% by mass or more based on the total amount of the polymerizable compound ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ H 2 C═CR 1 -CO-OR 2 -O-CH═CH-R 3 ... (1) (wherein, R 1 is a hydrogen atom or a methyl group, and R 2 is a divalent organic residue having 2 to 20 carbon atoms wherein R 3 is a hydrogen atom or a monovalent organic residue having 1 to 11 carbon atoms.) ​ ​ ​ ​ ​ ​

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