JP5586169B2 - Method for producing inkjet printed matter - Google Patents

Description

The present invention relates to a manufacturing method of the ink jet printing thereof.

Conventionally, ink-jet printed matter printed by ink-jet printing is well known (see, for example, Patent Document 1).
By the way, in the inkjet printed matter which has the pattern layer formed by said inkjet type printing, there existed a problem that the weather resistance and durability of the surface were scarce. In order to solve this problem, it has been proposed to employ ultraviolet curable ink and to irradiate ultraviolet rays to improve the durability of the surface. Furthermore, it has also been proposed to improve durability by forming an ultraviolet curable resin as a protective layer.

JP 2005-34995 A

  However, in the above countermeasure, there is a problem that the pigment contained in the ink hinders the absorption of ultraviolet rays and the ink is hard to be cured. For this reason, the ink-jet printed matter still has low weather resistance and durability as compared with the printed matter by other printing methods, and improvement has been demanded.

Accordingly, the present invention aims at providing a method of manufacturing an ink-jet printing product having excellent weather resistance and durability that can solve the above problems.

( Delete )

In order to solve the above problems , the present invention forms a picture layer on a plate glass as a substrate by ink jet printing using an ultraviolet curable resin ink, cures the picture layer by ultraviolet irradiation, A transparent electron beam curable resin layer is formed on the pattern layer after irradiation, and then an electron beam is irradiated from above the electron beam curable resin layer, whereby the electron beam curable resin layer has an electron beam curable property. The pattern layer is completely cured by curing the resin and the UV curable resin ink of the pattern layer, and the electron beam curable resin layer is completely cured to form the transparent protective layer. Provided is a method for producing an inkjet print.

In the present invention, the pattern layer is composed of basic colors of cyan, magenta, yellow, and black, and each basic color is accelerated by a carbon sunshine weather meter according to JIS K 7350-4-2008. This is a method for producing an ink-jet printed matter having a color difference of less than 10 before and after the test after 3000 hours.

Further, in the present invention, the picture layer is composed of basic colors of cyan, magenta, yellow and black, and each basic color is obtained after 1000 hours in a light resistance test according to JIS R 3221-2002. This is a method for producing an ink jet printed material having a change rate of visible light transmittance before and after the test of 4% or less and a color difference of less than 10.

[Action]
Since the pattern layer is made of ultraviolet curable resin ink, it is cured by ultraviolet irradiation. However, since the pattern layer contains a pigment, only the surface of the pattern layer is cured and the inside is not completely cured. Thus, when an electron beam curable resin is applied onto a pattern layer in a state where it is not completely cured (that is, a state containing an unreacted monomer), an electron beam is irradiated from above the electron beam curable resin. In addition, the electron beam curable resin is cured to form a transparent protective layer, as well as to the inside of the picture layer disposed below the electron beam curable resin (that is, Unreacted monomer in the pattern layer can be reacted). Therefore, the electron beam for forming the transparent protective layer also plays a role of completely curing the pattern layer, and can improve the weather resistance and durability of the pattern layer simultaneously with the formation of the transparent protective layer. Thereby, it is possible to maintain the initial printing color tone and printing texture over a long period of time regardless of whether indoors or outdoors. In addition, an electron beam curable resin layer made of an electron beam curable resin can be cured only by an electron beam irradiation process to form a transparent protective layer, and a pattern layer containing an unreacted monomer can be completely cured. Manufacturing efficiency is good.

〔effect〕
The present invention is an ink-jet printed material having a substrate on which a transparent protective layer made of an electron beam curable resin is formed on a surface, and is excellent in weather resistance and durability. In addition, since the pattern layer formed by ink jet printing is made of an ultraviolet curable ink, the inside of the pattern layer is completely cured by irradiation with an electron beam when the transparent protective layer is formed on the surface. Weather resistance and durability are greatly improved. Moreover, since the printing of the pattern layer is an inkjet method, the manufacturing cost of the printed material is lower than other printing methods.

It is sectional drawing of the inkjet printing plate glass 1. FIG.

<Inkjet printed matter>
The inkjet printed material of the present invention is an inkjet printing plate glass having a plate glass as a base material. The ink-jet printing plate glass is used for, for example, advertising billboards, guide plates, design partition plates, design handrail plates, architectural design glass panels, vehicle design glass panels, furniture decorative panels, home appliance decorative panels, or front panels for pachinko. Can be used. In addition, the present invention is very useful as a technique for providing an ink-jet print excellent in weather resistance and durability.

<Base material>
The substrate is a plate glass, and for example, soda lime silicate plate glass or other plate glass is adopted.

<Inkjet printing>
In the ink jet printing of the present invention, a known ink jet printer capable of high-speed printing with high image quality is used. For example, the configuration disclosed in Japanese Patent Application Laid-Open No. 2005-34995 may be used, and for example, a full color on-demand ink jet printer manufactured by Mimaki Engineering (model number JF1631) may be used.

<UV curable resin ink>
In the present invention, ultraviolet curable resin ink is used for ink jet printing. Examples of the ultraviolet curable resin ink include acrylic resins, polyvinyl resins, polymaleic acid resins, polyester resins, polyether resins, polyurethane resins, polyamide resins, polyepoxy resins, and radiation curing. Any one of resins selected from any of the polymerizable oligomers and monomers can be used, and a mixture of two or more of the above oligomers or monomers can be used.

The pigment contained in the ultraviolet curable resin ink is an inkjet pigment, and organic pigments other than carbon black and titanium oxide are used. For example, a known organic pigment having excellent weather resistance can be selected.
For example, in the case of blue, copper phthalocyanine (Pigment Blue 15), metal phthalocyanine, induslen blue (Pigment Blue 22), and bat blue 4, 6, 20 are desirable. In the case of green, pigment green 1, 2, 7, 10, 12, 36, 37, 38, bat green 1 and Ingrain green 3 are desirable. In the case of purple, dioxazine violet, pigment violet 19, pigment violet red 122, pigment violet 1, pigment violet 2, pigment violet 3, pigment violet 5, bat violet 1, bat violet 3, and bat violet 10 are desirable.

  An activator may be added to the ultraviolet curable resin ink. As the activator, a known surfactant is employed. For example, there are ionic (cationic / anionic / zwitter) or nonionic (nonionic), and nonionic (nonionic) is particularly desirable. Specific examples include polyethylene glycol monoalkyl ethers or esters and polyethylene glycol alkylphenyl ethers.

<Picture layer>
The pattern of the picture layer can be arbitrarily set, and characters, map information, wood grain pattern, marble pattern, abstract pattern, etc. can be selected.

<Electron beam curable resin>
A well-known structure may be employ | adopted for the electron beam curable resin which concerns on this invention. For example, those comprising a monomer, a prepolymer or a polymer having a radically polymerizable unsaturated group such as a (meth) acryloyl group, a (meth) acryloyloxy group, or a cationically polymerizable functional group such as an epoxy group in the molecule. Proposed. These monomers, prepolymers, and polymers are used alone or in combination. In addition, as (meth) acrylate, there is acrylate or methacrylate.

  Further, the prepolymer having a radical polymerizable unsaturated group includes polyester (meth) acrylate, urethane (meth) acrylate, polyether (meth) acrylate, silicon (meth) acrylate, epoxy (meth) acrylate, and fluorine (meth). Examples include acrylate, melamine (meth) acrylate, triazine (meth) acrylate, and polyvinylpyrrolidone. This prepolymer usually has a molecular weight of about 10,000 or less. When the molecular weight exceeds 10,000, the cured resin layer has insufficient surface properties such as scratch resistance, abrasion resistance, chemical resistance, and heat resistance. Although the acrylate and methacrylate can be used in common, the acrylate is more advantageous for the purpose of curing efficiently at a high speed and in a short time because the acrylate is faster in terms of the crosslinking curing rate with an electron beam.

Examples of the prepolymer having a cationic polymerizable functional group include epoxy resins such as bisphenol type epoxy resins, novolac type epoxy resins, and alicyclic epoxy resins, aliphatic vinyl ethers, aromatic vinyl ethers, urethane vinyl ethers, esters. And vinyl ether resins such as vinyl ether, prepolymers such as cyclic ether compounds and spiro compounds.
As the electron beam source used in the present invention, various electron beam accelerations such as a cockroft Walton type, a bandegraft type, a resonant transformer type, an insulated core transformer type, a linear type, a dynamitron type, a high frequency type, etc. There is a device. By irradiation with such an electron beam, the electron beam curable resin undergoes a crosslinking polymerization reaction and changes to a three-dimensional polymer structure.

  And the inkjet printing plate glass 1 as an inkjet printed matter is equipped with the pattern layer 20 on the plate glass 10 as a base material, Furthermore, it is the transparent protection formed on the surface of this inkjet printing plate glass 1 on this pattern layer 20 At least a layer 31 is provided.

Hereinafter, examples of the inkjet printing plate glass 1 will be described. The evaluation test is based on JIS
R3221-2002, based on JIS K 7350-4-2008.
<Example>
Spray a glass primer (a primer for soda lime silicate glass composed of silicon-based paint) on a plate glass made of soda lime silicate glass as a base material so that the dry coating thickness is 5 to 10 μm. After coating and drying at 60 ° C. for 1 hour, an ultraviolet curable resin ink was directly printed on the surface with an inkjet printer (inkjet printing) to form a pattern layer. Further, the pattern layer was cured by irradiating the pattern layer with ultraviolet rays by an irradiation device mounted on an ink jet printer.
The plate glass has a length of 300 mm, a width of 75 mm, and a thickness of 3 mm, and the pattern of the pattern layer has four squares of 5 cm square arranged at equal intervals. The color of the first square was cyan, the second square was magenta, the third square was yellow, and the fourth square was black. Cyan, magenta, yellow, and black are the basic colors of inkjet printer ink, respectively.
Next, a transparent acrylic electron beam curable resin paint having a diluent of 1,6HD-A (1,6 hexanediacrylate) with respect to the electron beam curable urethane acrylate is formed on the pattern layer with a thickness of 30 to 40 μm. The first electron beam curable resin layer is formed by spray coating, and the electron beam curable resin coating of the electron beam curable resin layer is cured by irradiating an electron beam under the condition of 2.5 Mrad, did. Further, the upper surface of the undercoat layer (cured first electron beam curable resin layer) is polished with sanding paper having a count of 400, and the electron beam curable resin paint is sprayed on the surface in a film thickness of 50 to 60 μm. It applied and formed the electron beam curable resin layer in the uppermost layer. Then, an electron beam is irradiated from above the electron beam curable resin layer under a condition of 3.0 Mrad to completely cure the electron beam curable resin coating of the electron beam curable resin layer, and a transparent protective layer as an overcoat layer Formed.

By the above manufacturing method, as shown in FIG. 1, the plate glass 10, the primer layer 15 formed on the plate glass 10, the pattern layer 20 formed on the primer layer 15, and the pattern layer 20 An inkjet printing plate glass 1 having the formed undercoat layer 30 and the transparent protective layer 31 formed on the undercoat layer 30 was obtained.
In the above manufacturing method, immediately after the ultraviolet irradiation, the pattern layer 20 is not completely cured (that is, a state containing an unreacted monomer), but is irradiated with the above 2.5 Mrad. The electron beam and the electron beam irradiated with 3.0 Mrad completely cure the pattern layer 20 to the inside (that is, the unreacted monomer of the pattern layer 20 reacts).

  The inkjet printing plate glass 1 was subjected to an accelerated durability test (3000 hours) using a carbon sunshine weather meter according to JIS K 7350-4-2008. And the color difference of each basic color of the ink jet ink before and after the test was measured with a simple spectral color difference meter (model number: NF333) manufactured by JEOL. The number of test samples was three, and the color difference of each basic color of the inkjet ink before and after the test was measured for each test sample. The measurement results are as shown in Table 1 below.

As shown in Table 1, in the first square (color: cyan), the color difference is 2.6 ≦ ΔE ≦ 2.
It was 9. In the second square (color: magenta), the color difference was 6.1 ≦ ΔE ≦ 6.3. In the third square (color: yellow), the color difference was 2.4 ≦ ΔE ≦ 3.2.
In the fourth square (color: black), the color difference was 3.2 ≦ ΔE ≦ 6.6.
That is, for all basic colors, the color difference of the inkjet ink before and after the test was less than 10, more specifically, in the range of 2 ≦ ΔE ≦ 7.

  Moreover, about the said inkjet printing plate glass 1, the ultraviolet irradiation test for 1000 hours was done based on the light resistance test described in JISR3221-2002. As a tester, an ultraviolet irradiation device (model number: H75) for glass manufactured by Suga Test Instruments was used. The number of test samples was three, and the color difference of each basic color of the inkjet ink before and after the test was measured for each test sample. The measurement results are as shown in Table 2 below.

As shown in Table 2, in the first square (color: cyan), the color difference is 1.9 ≦ ΔE ≦ 2.
4. In the second square (color: magenta), the color difference was 4.0 ≦ ΔE ≦ 5.0. In the third square (color: yellow), the color difference was 2.3 ≦ ΔE ≦ 2.6.
In the fourth square (color: black), the color difference was 1.5 ≦ ΔE ≦ 1.9.
That is, for all the basic colors, the color difference of the inkjet ink before and after the test was less than 10, more specifically, in the range of 1.5 ≦ ΔE ≦ 5.0.

  Moreover, about the said inkjet printing plate glass 1, the change rate (DELTA) Tv of the visible light transmittance | permeability before and after the test in all the basic colors was measured after 1000 hours in the light resistance test according to JISR3221-2002. The number of test samples is 3, and the measurement results for each test sample are as shown in Table 3 below.

As shown in Table 3, the rate of change in the first square (color: cyan) was 1.7% ≦ ΔTv ≦ 2.3%. In the second square (color: magenta), the rate of change was 2.3% ≦ ΔTv ≦ 2.5%. In the third square (color: yellow), the rate of change was 1.8% ≦ ΔTv ≦ 2.8%. In the fourth square (color: black), the rate of change was 1.0% ≦ ΔTv ≦ 1.8%.
That is, for all the basic colors, the change rate of the visible light transmittance after the test, which was defined in JIS R3221-2002, was 4% or less, and the light resistance equivalent to that of the heat reflecting glass was obtained.

A comparative example is shown below.
<Comparative example>
An ultraviolet curable resin ink was directly printed with an ink jet printer on a plate glass as a substrate to form a pattern layer, thereby obtaining a plate glass on which ink jet printing was performed. Then, the pattern layer was cured by irradiating with ultraviolet rays. This plate glass is the same as the examples except that it does not include the primer layer 15 in the above example, the undercoat layer 30 in which the electron beam curable resin layer is cured, and the transparent protective layer 31 in which the electron beam curable resin layer is cured. It was manufactured under the same conditions.
The plate glass has a length of 300 mm, a width of 75 mm, and a thickness of 3 mm, and the pattern of the pattern layer has four squares of 5 cm square arranged at equal intervals. The color of the first square was cyan, the second square was magenta, the third square was yellow, and the fourth square was black. Cyan, magenta, yellow, and black are the basic colors of inkjet printer ink, respectively. The number of test samples was three.

  The plate glass of the comparative example was subjected to an accelerated durability test using a carbon sunshine weather meter according to JIS K 7350-4-2008. And the test sample was taken out at the time of the test start 200 hours.

  When the plate glass was first visually observed, significant discoloration was observed in the third square (color: yellow). The color difference before and after the test of the third square (color: yellow) (the same measurement method as the above measurement method) was 16.8, 17.5, 18.9 for each test sample, and the color difference for all the test samples. Exceeded 10. Further, in the second square (color: magenta), the pattern layer was cracked and almost peeled off and peeled off. For this reason, the above color difference measurement is impossible, and the result is extremely poor in durability.

  Therefore, the weather resistance and durability of the ink jet printing plate glass as a printed matter according to the present invention are dramatically improved.

  The present invention can be appropriately modified without departing from the gist of the present invention, and is not limited to the above embodiments.

1 Inkjet printing plate glass (inkjet prints)
10 Flat glass (base material)
20 Pattern layer 31 Transparent protective layer

Claims (3)

On the plate glass as the substrate, ink jet printing using an ultraviolet curable resin ink is performed and the ink is irradiated with ultraviolet rays to form a cured pattern layer, and the pattern layer is cured by irradiation with ultraviolet rays. Then, a transparent electron beam curable resin layer is formed on the pattern layer after ultraviolet irradiation, and then an electron beam is irradiated from above the electron beam curable resin layer to form an electron beam of the electron beam curable resin layer. The pattern layer is completely cured by curing the curable resin and the ultraviolet curable resin ink of the pattern layer, and the electron beam curable resin layer is completely cured to form the transparent protective layer. A method for producing an inkjet printed material. The pattern layer is composed of basic colors of cyan, magenta, yellow and black,
The method for producing an ink-jet printed matter according to claim 1, wherein each basic color has a color difference of less than 10 before and after the test after 3000 hours in an accelerated durability test using a carbon sunshine weather meter according to JIS K 7350-4-2008. . The pattern layer is composed of basic colors of cyan, magenta, yellow and black,
Each basic color has a change rate of visible light transmittance before and after the test of 1000 hours in a light resistance test according to JIS R 3221-2002 of 4% or less and a color difference of less than 10. Or the manufacturing method of the inkjet printed material of Claim 2 .