Titanium paper and decorative board for inkjet printing

Abstract

To provide a titanium paper for inkjet printing excellent in inkjet printing adjustability, and impregnating property of a thermoset resin, and a decorative sheet.SOLUTION: A titanium paper 10 for inkjet printing has an ink-receiving layer 2 formed on the surface of a titanium paper 1, where the ink-receiving layer 2 contains an urea-based resin, and an inorganic metal, the content of the inorganic metal in the ink-receiving layer 2 is 10 mass% or more with respect to a total mass of the ink-receiving layer 2, the inorganic metal has an average particle size in a volumetric basis particle size distribution of 5 μm or under, and the dry solid content of the ink-receiving layer 2 is 1 g / m2 or more.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] This disclosure relates to titanium paper and decorative board for inkjet printing. [Background technology]

[0002] One of the fields in which printed matter is used is for fittings. The colors of the substrates, such as plywood and particle board, used for decorative panels for fittings vary widely, and some are close to dark brown. For this reason, decorative paper with a printed pattern such as wood grain or abstract pattern to give it a design must be attached to the substrate to maintain a stable and beautiful color on the surface of the decorative panel. It is known that a base paper called titanium paper, which has excellent hiding power, is used as the decorative paper.

[0003] Conventionally, as titanium paper for inkjet printing, for example, base paper in which titanium white is mixed into pulp is known (see, for example, Patent Documents 1 to 3). In such titanium paper for inkjet printing, for example, a pattern is formed on one side of the base paper by inkjet printing to give it design. In addition, a substrate such as particle board or plywood is attached to the other side of the base paper, and further, a thermosetting resin such as melamine resin, polyester resin, or DAP resin is applied / impregnated and cured, and used as a surface decorative material for a decorative board. As a result, even if the color of the substrate varies or is dark brown, the color of the substrate can be concealed, and the surface of the decorative board can be maintained in a stable and beautiful color. Patent Documents 1 to 3 also propose providing an ink-receiving layer on the surface of the base paper of the decorative board in order to improve the suitability for inkjet printing, and also propose including calcium carbonate in the ink-receiving layer in order to improve the impregnation of the thermosetting resin. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 54-5434 [Patent Document 2] JP 2001-71447 A [Patent Document 3] Special Publication No. 2010-531251 Summary of the Invention [Problem to be solved by the invention]

[0005] However, with conventional techniques, it has been difficult to achieve both suitability for inkjet printing and impregnation ability with thermosetting resins. The present invention has been made in consideration of such problems, and has an object to provide a titanium paper and decorative board for ink-jet printing that are excellent in suitability for ink-jet printing and in impregnation with thermosetting resin. [Means for solving the problem]

[0006] In order to solve the above problems, one embodiment of the present invention provides a titanium paper for inkjet printing, which has an ink-receiving layer formed on the surface of the titanium paper, the ink-receiving layer containing a urea-based resin and an inorganic metal, the content of the inorganic metal in the ink-receiving layer being 10 mass% or more relative to the total mass of the ink-receiving layer, and the inorganic metal being: Calcium carbonate, The average particle size in the particle size distribution of the volume-based particle size is 3μm or more 5 μm or less, and the dry solid content of the ink-receiving layer is 1 g / m 2 That's all.

[0007] A decorative board according to another embodiment of the present invention comprises a substrate for decorative board, and the titanium paper for inkjet printing laminated to the substrate for decorative board. Effect of the Invention

[0008] According to the aspects of the present invention, it is possible to obtain titanium paper and decorative board for inkjet printing that are excellent in suitability for inkjet printing and in impregnation with thermosetting resin. [Brief description of the drawings]

[0009] [Figure 1] 1 is a cross-sectional view showing one example of the configuration of titanium paper for inkjet printing according to a first embodiment of the present invention [Diagram 2] FIG. 4 is a cross-sectional view showing one configuration example of a decorative board according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The present disclosure will be described below through embodiments, but the following embodiments do not limit the invention according to the claims. In addition, not all of the combinations of features described in the embodiments are necessarily essential to the solution of the invention. In addition, the drawings are schematic diagrams of the invention according to the claims, and the dimensions of the width, thickness, etc. of each part are different from the actual dimensions, and the ratios between these dimensions are also different from the actual dimensions.

[0011] The titanium paper for inkjet printing according to the first embodiment of the present invention will be described. The titanium paper for inkjet printing according to the present invention is preferably used for decorative boards applied to building materials, for example. In the following description, the side of the titanium paper for inkjet printing that comes into contact with the adhesive surface may be referred to as "bottom", and the side opposite to the side of the titanium paper for inkjet printing that comes into contact with the adhesive surface (front surface) may be referred to as "top". Each aspect of each embodiment of the present invention will be described below with reference to the drawings.

[0012] 1. First embodiment (Basic composition of titanium paper 10 for inkjet printing) As shown in Fig. 1, the titanium paper 10 for inkjet printing according to the first embodiment of the present invention (hereinafter referred to as "this embodiment") is configured by forming an ink receiving layer 2 on one side of the titanium paper 1. The titanium paper 10 for inkjet printing may be formed into decorative paper by forming a picture pattern layer (not shown) on the surface of the ink receiving layer 2 by inkjet printing.

[0013] (Titanium Paper 1) Titanium paper 1 is a base paper made by mixing titanium white into pulp. Titanium paper 1 is, for example, a calendered paper with a basis weight of 60 g / m 2 More than 110g / m 2 It is obtained by papermaking a stock containing titanium oxide on a Fourdrinier papermaking machine on printing base paper with an ash content of 20% or more and less than 40% by mass.

[0014] (Ink Receiving Layer 2) The ink receiving layer 2 is a layer for fixing the aqueous inkjet ink applied by inkjet printing without bleeding. The ink receiving layer 2 can be provided by applying a coating liquid for the ink receiving layer 2 to the surface of the titanium paper 1. For example, a gravure coater, a bar coater, a blade coater, a roll coater, or a curtain coater can be used as the coating device. The amount of the coating liquid applied can be, for example, 1 g / m2 in terms of dry solid content. 2 That is all.

[0015] That is, in the inkjet printing titanium paper 10 according to this embodiment, the ink receiving layer 2 has a dry solid content of 1 g / m 2 The dry solid content of the ink receiving layer 2 is preferably 1 g / m or more. 2 If the amount is less than this, the color development of the aqueous inkjet ink may decrease, and the inkjet printability may decrease. In addition, the upper limit of the coating amount of the coating liquid is 20 g / m2 in terms of dry solid content. 2 In other words, the dry solid content of the ink receiving layer 2 is 1 g / m 2 More than 20g / m 2 It is more preferable that the content is within the following range:

[0016] The ink receiving layer 2 is composed of, for example, a binder resin, an inorganic metal, and an additive. In this embodiment, the binder resin may be, for example, a urea-based resin. That is, in the inkjet printing titanium paper 10 according to this embodiment, the ink receiving layer 2 contains a urea-based resin.

[0017] The content of the urea-based resin in the ink-receiving layer 2 is preferably in the range of 5% by mass to 90% by mass in terms of dry solid content with respect to the total mass of the ink-receiving layer 2. If the content of the urea-based resin in the ink-receiving layer 2 is less than 5% by mass, the impregnation with the thermosetting resin may be poor. For this reason, for example, when forming a decorative board using the titanium paper 10 for inkjet printing, swelling (blisters) is likely to occur during the impregnation with the thermosetting resin by hot and pressure pressing. On the other hand, if the content of the urea-based resin in the ink-receiving layer 2 is greater than 90% by mass, the high content of the urea-based resin in the ink-receiving layer 2 may reduce adhesion between the ink-receiving layer 2 and the titanium paper 1. By keeping the content of the urea-based resin within the range of 5% to 90% by mass, resin impregnation is improved and the occurrence of blisters can be suppressed.

[0018] The content of inorganic metal in the ink-receiving layer 2 is preferably 10% by mass or more, in terms of dry solid content, relative to the total mass of the ink-receiving layer 2. If it is less than 10% by mass, the content of inorganic metal in the ink-receiving layer 2 is low, resulting in low reflection density of the printed image. On the other hand, if the content of inorganic metal in the ink-receiving layer 2 is greater than 90% by mass, the high inorganic metal content in the ink-receiving layer 2 may make it difficult to apply the coating liquid for the ink-receiving layer 2 and may make it difficult to form the ink-receiving layer 2. In other words, it is more preferable that the ink-receiving layer 2 contain inorganic metal in the range of 10% to 90% by mass relative to the total mass of the ink-receiving layer 2.

[0019] Furthermore, the inorganic metal preferably has an average particle size of 5 μm or less in the particle size distribution of the volume-based particle size. If the average particle size of the inorganic metal exceeds 5 μm, the surface of the ink-receiving layer 2 may become rough and the smoothness may decrease. This may result in a decrease in the definition of the printed picture pattern, and the suitability for inkjet printing may decrease. On the other hand, the average particle size of the inorganic metal is preferably 0.1 μm or more from the viewpoints of production, handling, and chemical stability, and therefore the average particle size of the inorganic metal is more preferably 0.1 μm or more and 5 μm or less.

[0020] In the inkjet printing titanium paper 10 according to this embodiment, titania, silica, calcium, alumina, zirconia, chromium, nickel, etc. can be used as the inorganic metal added to the ink-receiving layer 2. Compounds of these inorganic metals may be used in the ink-receiving layer 2. Furthermore, in the ink-receiving layer 2, these inorganic metals may be used alone or in a mixture. Furthermore, for example, a cationic ink setting agent can be used as an additive in the ink receiving layer 2. Furthermore, if necessary, a surfactant, a defoaming agent, a thickening agent, a water resistance agent, etc. may be added.

[0021] (Pattern layer) As described above, the inkjet printing titanium paper 10 of this embodiment may be provided with a picture pattern layer. The picture pattern layer is a layer on which a picture is printed with an aqueous inkjet ink to impart design. The picture pattern layer can be provided by printing a picture on the surface of the ink-receiving layer 2 by inkjet printing. As the picture, for example, a wood grain, cork, abstract pattern, or other picture suitable for the location where the inkjet printing titanium paper 10 is used can be selected.

[0022] As described above, the titanium paper for inkjet printing 10 according to this embodiment is a titanium paper for inkjet printing in which an ink-receiving layer 2 is formed on the surface of the titanium paper 1, and the ink-receiving layer 2 contains a urea-based resin and an inorganic metal, the content of the inorganic metal in the ink-receiving layer 2 is 10 mass % or more relative to the total mass of the ink-receiving layer 2, the inorganic metal has an average particle size of 5 μm or less in the particle size distribution of volume-based particle sizes, and the dry solid content of the ink-receiving layer 2 is 1 g / m 2 That's all. According to this configuration, it is possible to provide titanium paper for inkjet printing that has excellent inkjet printability and resin impregnation properties.

[0023] 2. Second embodiment A decorative board according to a second embodiment of the present disclosure will be described with reference to Fig. 2. Fig. 2 is a cross-sectional view for illustrating one configuration example of a decorative board 11 according to the second embodiment of the present invention. (Decorative board) 2, the decorative board 11 includes a base material 3, which is a base material for decorative boards, and titanium paper 10 for inkjet printing bonded to the base material 3. Specifically, the decorative board 11 uses titanium paper 10 for inkjet printing having an ink receiving layer 2 provided on one side of the titanium paper 1, and the other side of the titanium paper 1 is bonded to the base material 3. That is, the decorative board 11 differs from the titanium paper 10 for inkjet printing according to the first embodiment in that it includes a base material 3. Note that the titanium paper 10 for inkjet printing has the same configuration as that of the first embodiment, and therefore a description thereof will be omitted.

[0024] The substrate 3 is assumed to be, for example, a substrate for fittings, and can be made of tropical wood plywood, particle board, medium density fiberboard (hereinafter referred to as MDF), ordinary plywood as specified by the Japanese Agricultural Standards, etc. Substrates made of olefin resin with added wood powder can also be used.

[0025] In the example shown in Fig. 2, a substrate 3 is attached to the other surface of the titanium paper 1, and a thermosetting resin is applied and impregnated into the ink receiving layer 2 and cured to form a decorative board 11. Examples of the decorative board 11 include high pressure melamine decorative boards, low pressure melamine decorative boards, polyester decorative boards, and DAP decorative boards. As a method for integrating the substrate 3 and the titanium paper for inkjet printing 10, for example, a method of hot and pressure pressing (hot and pressure molding) using a hot and pressure press machine can be used.

[0026] As described above, the decorative board 11 according to this embodiment includes the base material 3 which is a base material for a decorative board, and the titanium paper 10 for inkjet printing bonded to the base material 3. According to this configuration, a decorative board having excellent inkjet printability and resin impregnation property can be provided. EXAMPLES

[0027] The titanium paper for inkjet printing according to the present disclosure will be described below with reference to examples. In the examples, titanium paper for inkjet printing was prepared according to the configuration described in each of the following examples and comparative examples, and a picture pattern was printed on the surface of the prepared titanium paper for inkjet printing using an aqueous inkjet printer, and the resulting printed matter was evaluated.

[0028] <Example 1> Titanium paper 1 with a basis weight of 80 g / m 2 A white printing base paper (KSH-801P, manufactured by Kohjin Co., Ltd.) was used. A coating liquid for the ink-receiving layer 2, which contains calcium carbonate, an inorganic metal, and a urea-based resin, was applied to one side of the titanium paper 1 to form the ink-receiving layer 2. The coating liquid was adjusted so that the inorganic metal was 55 mass % and the urea-based resin was 45 mass % in terms of dry solid content relative to the total mass of the ink-receiving layer 2. The inorganic metal had an average particle size of 5 μm in the particle size distribution based on volumetric particle size. The coating amount of the coating liquid was 2 g / m2 in terms of dry solid content. 2 The inorganic metal was Brilliant-1500 manufactured by Shiraishi Calcium Co., Ltd. The coating liquid was applied using a gravure printing machine. The coating liquid was then dried in an oven at 200° C. to form an ink receiving layer 2 on one side of the titanium paper 1. That is, the ink receiving layer 2 contains a urea resin and an inorganic metal, and the ink receiving layer 2 contains 10 mass % or more of inorganic metal having an average particle size of 5 μm or less in the particle size distribution of the volume-based particle size relative to the total mass of the ink receiving layer 2, and the dry solid content is 1 g / m 2 The above was carried out. In this way, the inkjet titanium paper of Example 1 was obtained. Furthermore, a picture pattern was printed on the surface of the ink-receiving layer 2 side of the inkjet printing titanium paper of Example 1 using a water-based inkjet printer, and the printed matter of Example 1 was obtained. <Example 2> The average particle size in the particle size distribution of the volume-based particle size of the inorganic metal was set to 0.1 μm. Except for this, the titanium paper for inkjet printing and the printed matter were prepared in the same manner as in Example 1. <Example 3> The content of inorganic metal in the ink receiving layer 2 was 10 mass %, and the average particle size in the particle size distribution of the volume-based particle size of the inorganic metal was 3 μm. Otherwise, titanium paper for inkjet printing and a printed matter were prepared in the same manner as in Example 2. <Example 4> The content of the urea resin in the ink receiving layer 2 was 10% by mass, and the content of the inorganic metal was 90% by mass. Except for this, the titanium paper for inkjet printing and the printed matter were prepared in the same manner as in Example 3. <Example 5> The content of the urea resin in the ink receiving layer 2 was 5% by mass, and the content of the inorganic metal was 55% by mass. Except for this, the titanium paper for inkjet printing and the printed matter were produced in the same manner as in Example 3. <Example 6> The content of the urea-based resin in the ink-receiving layer 2 was set to 90% by mass. Except for this, the titanium paper for ink-jet printing and the printed matter were produced in the same manner as in Example 3. <Example 7> The average particle size in the particle size distribution of the volume-based particle size of the inorganic metal is set to 3 μm, and the dry solid content of the ink-receiving layer 2 is set to 1 g / m 2 Except for the above, the titanium paper for inkjet printing and the printed matter were prepared in the same manner as in Example 1. <Example 8> The average particle size in the particle size distribution of the volume-based particle size of the inorganic metal is set to 3 μm, and the dry solid content of the ink-receiving layer 2 is set to 20 g / m 2 Except for the above, the titanium paper for inkjet printing and the printed matter were prepared in the same manner as in Example 1.

[0029] <Comparative Example 1> Except for not coating the ink receiving layer, titanium paper for inkjet printing was obtained in the same manner as in Example 1. Furthermore, a picture pattern was printed on the surface of titanium paper 1 of the titanium paper for inkjet printing of Comparative Example 1 using a water-based ink jet printer to obtain a printed matter of Comparative Example 1. <Comparative Example 2> An acrylic resin was used instead of a urea-based resin in the coating liquid for the ink-receiving layer 2. The content of the acrylic resin in the ink-receiving layer 2 was 60% by mass, the content of the inorganic metal was 9% by mass, the average particle size in the particle size distribution of the volume-based particle size of the inorganic metal was 6 μm, and the dry solid content of the ink-receiving layer 2 was 0.5 g / m 2 Except for the above, the titanium paper for inkjet printing and the printed matter were prepared in the same manner as in Example 1.

[0030] <Evaluation> The printed matter obtained in the above-mentioned Examples 1 to 8 and Comparative Examples 1 and 2 was evaluated by the following method.

[0031] <Evaluation> [Printing suitability] (Print density test) In each of the printed matters of Examples 1 to 8 and Comparative Examples 1 and 2, overprinting was performed with C (cyan), M (magenta), Y (yellow), and K (black), and the print densities of the overprinted parts were compared. Specifically, the reflection density of the overprinted parts of each printed matter was measured using a spectrophotometer (X-Rite's "eXact"). The measured reflection densities were evaluated in the following three stages: ◯, △, and ×. <Evaluation criteria> ○: Reflection density is 1.6 or more △: Reflection density is 1.2 or more and less than 1.6 ×: Reflection density is less than 1.2

[0032] (Thin line expression test) The definition of the printed picture pattern in each of the printed matters of Examples 1 to 8 and Comparative Examples 1 and 2 was visually confirmed and sensory evaluated on a three-level scale of ◯, △, and × according to the following criteria. <Evaluation criteria> ○: No difference in definition was observed compared to existing printed matter with a general ink receiving layer. △: The definition is slightly inferior to that of printed matter with a conventional ink-receiving layer. ×: The definition is inferior to that of a printed matter having no ink-receiving layer.

[0033] [Resin impregnation] (Impregnation speed test) The printed matter of each of Examples 1 to 8 and Comparative Examples 1 and 2 was cut into a circle with a diameter of 50 mm, and after drying for 3 hours in an oven at 100°C, the specimen was placed horizontally in a 50w% Nika resin aqueous solution with the printed surface facing downward, and the impregnation time from when the specimen came into contact with the liquid surface until the impregnation rate of the specimen reached 90% was measured (N=5). The measured impregnation time was evaluated in the following three stages: ◯, △, ×. <Evaluation criteria> Reference soaking time = soaking time of titanium paper without ink receiving layer ○: Measured soaking time ≦ 5% more than the standard soaking time △: 5% increase in standard soaking time < measured soaking time ≦ 20% increase in standard soaking time ×: Measured soaking time > 20% longer than standard soaking time

[0034] The above evaluation results are shown in Table 1 together with the composition of the ink-receiving layer 2. In the above evaluation results, "◯" is a pass, and "Δ" and "×" are fail.

[0035] [Table 1]

[0036] As shown in Table 1, in Examples 1 to 8, the ink-receiving layer 2 contains a urea-based resin and an inorganic metal, and the ink-receiving layer 2 contains 10 mass % or more of an inorganic metal having an average particle size of 5 μm or less in the particle size distribution of the volume-based particle size relative to the total mass of the ink-receiving layer 2, and the dry solid content of the ink-receiving layer 2 is 1 g / m 2 In the above cases, the printability and resin impregnation were all evaluated as "good" (pass). In other words, it was found that the inkjet printing titanium papers of Examples 1 to 8 were excellent in inkjet printability and thermosetting resin impregnation.

[0037] In contrast, in the case of a print made using the titanium paper for inkjet printing of Comparative Example 1, which does not have an ink-receiving layer 2, the evaluation of resin impregnation was passed, but in the evaluation of printability, the print density test was "△" and the thin line expression test was "×", both of which were failed. In addition, the ink-receiving layer does not contain a urea-based resin, the content of inorganic metals in the print-receiving layer is less than 10 mass%, the average particle size in the particle size distribution of the volume-based particle size of the inorganic metal is greater than 5 μm, and the dry solid content of the ink-receiving layer is less than 1 g / m 2 In the case of the print using the titanium paper for inkjet printing of Comparative Example 2, which was less than 100%, the printability was evaluated as pass, but the resin impregnation property was evaluated as "△" and was therefore unsuccessful.

[0038] In other words, the inkjet printing titanium papers of Comparative Examples 1 and 2 were unable to achieve both excellent inkjet printability and excellent resin impregnation properties.

[0039] The inkjet printing titanium paper and decorative board of the present invention are not limited to the above-mentioned embodiments and examples, and various modifications are possible within the scope of the invention without impairing its characteristics. [Explanation of symbols]

[0040] 1. Titanium Paper 2 Ink receiving layer 3 Base material 10 Titanium paper for inkjet printing 11 Decorative Panel

Claims

1. A titanium paper for inkjet printing, comprising an ink receiving layer formed on the surface of the titanium paper, the ink receiving layer contains a urea-based resin and an inorganic metal, a content of the inorganic metal in the ink-receiving layer is 10% by mass or more based on a total mass of the ink-receiving layer; The inorganic metal is calcium carbonate, and has an average particle size in a volume-based particle size distribution of 3 μm or more and 5 μm or less, The ink receiving layer has a dry solid content of 1 g / m ２ That's all. Titanium paper for inkjet printing.

2. The ink receiving layer contains the urea-based resin in an amount of 5% by mass to 90% by mass based on the total mass of the ink receiving layer. The titanium paper for ink-jet printing according to claim 1.

3. The ink receiving layer contains the inorganic metal in an amount of 10% by mass or more and 90% by mass or less based on the total mass of the ink receiving layer. The titanium paper for ink-jet printing according to claim 1 or 2.

4. The ink receiving layer has a dry solid content of 1 g / m ２ 20g / m or more ２ Is within the following range The titanium paper for ink-jet printing according to any one of claims 1 to 3.

5. A decorative board substrate; A decorative board comprising the titanium paper for inkjet printing according to claim 1 , which is bonded to the substrate for decorative board.

Images