Printing paper, method for producing the same, decorative paper, and decorative board

Abstract

To provide printing paper capable of increasing printing density and capable of increasing impregnation properties into the inside even if a resin liquid is applied from the surface side, to provide a method for producing the printing paper, and to provide decorative paper and a decorative board.SOLUTION: The printing paper 110 includes a paper base material 111 and an ink fixing agent which is contained in the paper base material 111 and fixes ink on the surface of the paper base material 111.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to printing paper, a method for manufacturing the same, and decorative paper and decorative board. [Background technology]

[0002] Decorative boards, in which decorative paper with a printed pattern or the like is attached to a substrate, are widely used as interior and exterior building materials, etc. The decorative paper used in such decorative boards often has a long pattern, so the pattern is applied to the printing paper using inkjet ink by inkjet printing.

[0003] Printing paper used for such inkjet printing has a receiving layer on the surface of the paper base material to which the ink adheres, thereby fixing the ink to the surface of the paper base material and increasing the print density. Decorative paper with a pattern or the like ink-jet printed on the receiving layer on the paper base material is used as a decorative board by impregnating it with a resin liquid containing a thermosetting resin such as melamine resin and heating and pressing it together with a substrate. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 2010-531251 [Patent Document 2] Japanese Patent Application Publication No. 2017-080955 [Patent Document 3] Japanese Patent Application Laid-Open No. 2017-164940 Summary of the Invention [Problem to be solved by the invention]

[0005] Conventional printing paper such as that described above has a receiving layer on the surface of the paper base material to fix the ink to the surface of the paper base material, so if a resin liquid is applied to the surface of the decorative paper, it becomes difficult to impregnate the interior of the paper base material.

[0006] In view of the above, the present invention aims to provide printing paper that can increase print density and also increase the impregnation ability into the interior even when a resin liquid is applied from the surface side, a method for manufacturing the same, and decorative paper and decorative board. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, the printing paper of the present invention is characterized by comprising a paper base material and an ink fixing agent contained inside the paper base material and fixing ink to the surface of the paper base material.

[0008] Furthermore, in the printing paper according to the present invention, it is preferable that the ink fixing agent is present in gaps between pulp fibers of the paper base material.

[0009] Furthermore, in the printing paper according to the present invention, it is preferable that the ink fixing agent in the above-mentioned printing paper contains calcium chloride.

[0010] Furthermore, in the printing paper according to the present invention, it is preferable that the paper base material is titanium paper containing titanium oxide.

[0011] On the other hand, the method for manufacturing printing paper according to the present invention, which is for solving the above-mentioned problems, is the method for manufacturing printing paper described above, characterized in that it comprises an impregnation step of impregnating a treatment liquid containing the ink fixing agent into the paper base material, and a drying step of drying the paper base material containing the treatment liquid.

[0012] Furthermore, in order to solve the above-mentioned problems, the decorative paper of the present invention is characterized by comprising the above-mentioned printing paper of the present invention and a pattern layer made of the ink that is fixed to the surface of the paper base material of the printing paper to form a pattern.

[0013] Furthermore, in the decorative paper according to the present invention, it is preferable that the ink in the decorative paper described above is an inkjet ink.

[0014] Furthermore, in order to solve the above-mentioned problems, the decorative board of the present invention is characterized by comprising the above-mentioned printing paper of the present invention, a pattern layer made of the ink that is fixed to the surface of the paper base material of the printing paper to form a pattern, a thermosetting resin that covers the pattern layer and is contained inside the paper base material, and a substrate that is arranged on the back surface of the paper base material. [Effects of the Invention]

[0015] According to the present invention, it is possible to provide printing paper that can increase print density and that can increase the impregnation of the resin liquid into the interior even when it is applied from the surface side, a method for manufacturing the same, and decorative paper and decorative board. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a cross-sectional view showing a schematic configuration of a main embodiment of printing paper according to the present invention. [Figure 2] 1 is a cross-sectional view showing a schematic configuration of a main embodiment of decorative paper according to the present invention. [Figure 3] 1 is a cross-sectional view showing a schematic configuration of a main embodiment of a decorative board according to the present invention. [Figure 4] 2 is a flow chart showing the steps of a method for manufacturing the printing paper of FIG. 1. DETAILED DESCRIPTION OF THE INVENTION

[0017] The present invention will be described with reference to the drawings, which illustrate embodiments of the printing paper, its manufacturing method, decorative paper, and decorative board according to the present invention. Note that the present invention is not limited to the following embodiments, which are described with reference to the drawings, and various technical matters described in each embodiment can be appropriately combined or substituted as necessary.

[0018] [Main embodiment] Main embodiments of the printing paper, its manufacturing method, decorative paper and decorative board according to the present invention will be described with reference to FIGS.

[0019] <Printing paper> As shown in FIG. 1, the printing paper 110 according to this embodiment contains an ink fixing agent inside the paper substrate 111 that fixes ink on the surface of the paper substrate 111.

[0020] 《Paper base material 111》 The paper substrate 111 is titanium paper made by incorporating titanium white (titanium oxide) into pulp, and by including titanium white (titanium oxide) inside, it is possible to enhance the hiding power and suppress the variation in quality due to the difference in color tone between individual substrates. Specifically, for example, calendered printing base paper (basis weight 60 g / m 2 More than 110g / m 2 The paper base material 111 can be manufactured by papermaking a material containing titanium white (titanium oxide) and the like in a Fourdrinier paper machine or the like. The paper base material 111 preferably has an ash content of 20% by mass or more and less than 40% by mass.

[0021] Ink fixative The ink fixing agent is colorless (white) so as not to interfere with the color tone of the ink, contains calcium chloride, and is present in the gaps between the pulp fibers of the paper base material 111. The ink fixing agent may also contain various other additives.

[0022] <Decorative paper> As shown in Figure 2, the decorative paper 120 of this embodiment comprises the above-mentioned printing paper 110 and a pattern layer 121 made of ink that is fixed to the surface (top surface in Figure 2) of the paper base material 111 of the printing paper 110 to form a pattern.

[0023] "Picture layer 121" The pattern layer 121 is formed with inkjet ink to impart a design, and examples of the pattern include wood grain patterns, cork patterns, geometric patterns, abstract patterns, etc. Examples of inkjet ink include water-based pigment inks.

[0024] <Decorative panels> As shown in Figure 3, the decorative board 130 of this embodiment comprises the decorative paper 120 described above, a thermosetting resin 131 that covers the pattern layer 121 and is contained inside the paper base material 111, and a substrate 132 that is placed on the back surface (the bottom surface in Figure 3) of the paper base material 111.

[0025] 《Thermosetting resin 131》 The thermosetting resin 131 is dissolved in a solvent to form a resin liquid, which is applied to the surface of the decorative paper 120 and dried, thereby forming a protective layer on the surface of the decorative paper 120 and also impregnating and containing the resin between the pulp fibers inside the paper base material 111. Examples of the thermosetting resin 131 include melamine resin, polyester resin, and diallyl phthalate (DAP) resin. Examples of the solvent for the resin liquid include water. In particular, it is highly preferable that the thermosetting resin in the resin liquid is a water-soluble methylol melamine resin (melamine-formaldehyde initial condensate) and that the solvent for the resin liquid is water.

[0026] "Board 132" The substrate 132 is attached to the front surface (top surface in FIG. 3) of the decorative paper 120 with the back surface (bottom surface in FIG. 3) facing up, and forms the framework of the decorative board 130. The substrate 132 is subjected to a heat and pressure treatment together with the decorative paper 120, and is integrally bonded to the decorative paper 120 by the thermosetting resin contained inside the decorative paper 120. Examples of materials for the substrate 132 include tropical plywood, particle board, medium density fiberboard (MDF), and ordinary plywood.

[0027] <Manufacturing method> A method for manufacturing the printing paper 110, decorative paper 120, and decorative board 130 according to this embodiment will be described with reference to FIG.

[0028] First, a treatment liquid containing the ink fixing agent in a liquid medium is applied to the surface side of the paper substrate 111 using an application device to incorporate the ink fixing agent into the paper substrate 111 (incorporation step S11). Examples of application devices include a gravure printing machine and a coater. Examples of the liquid medium for the treatment liquid include water, and when the ink fixing agent contains calcium chloride, water is particularly preferred. The treatment liquid can also contain various other additives.

[0029] After the containing step S11 is completed, the paper substrate 111 containing the treatment liquid is dried in a drying device (drying step S12), thereby producing the printing paper 110. Examples of the drying device include an oven and a hot air dryer.

[0030] Next, inkjet ink is inkjet printed on the front side of the printing paper 110 using an inkjet printer to form a picture layer 121 on the surface of the paper base material 111 (printing step S13), thereby manufacturing the decorative paper 120. At this time, because the ink fixing agent is contained inside the paper base material 111, the decorative paper 120 can significantly prevent the ink pigment from penetrating deep inside the paper base material 111, and a large amount of ink pigment can be fixed on the front side of the paper base material 111, thereby increasing the print density.

[0031] Next, a resin liquid is applied onto the picture layer 121 of the decorative paper 120 using a coater, thereby covering the picture layer 121 with the resin liquid and impregnating the inside of the paper base material 111 with the resin liquid (coating step S14). An example of a coater is a coater. At this time, the decorative paper 120 contains the ink fixative inside the paper base material 111, i.e., the ink fixative does not cover the surface of the paper base material 111, so the resin liquid penetrates into the paper base material 111 without being significantly hindered and impregnates all the way to the back surface.

[0032] Then, after drying in a drying device (drying step S15), the substrate 132 is placed on top of the decorative paper 120 and heated and pressed in a heating and pressing machine (heating and pressing step S16), so that the thermosetting resin 131 covers the pattern layer 121 and bonds the substrate 132 and decorative paper 120 together, producing the decorative board 130. Examples of drying devices include an oven and a hot air dryer.

[0033] <Action and effect> In this embodiment, the ink fixing agent does not cover the surface of the paper substrate 111 but is contained within the paper substrate 111. This significantly prevents the ink pigment from penetrating deep into the interior of the paper substrate 111, allowing a large amount of ink pigment to be fixed on the surface side of the paper substrate 111, thereby increasing print density. At the same time, the resin liquid can penetrate into the interior of the paper substrate 111 without significant obstruction and impregnate all the way to the back side, making it easy to contain the necessary and sufficient amount of thermosetting resin 131 between the pulp fibers throughout the interior of the paper substrate 111.

[0034] Therefore, according to this embodiment, it is possible to provide a printing paper 110, a manufacturing method thereof, and decorative paper 120 and decorative board 130 that can increase the fixation of ink on the surface side of the paper base material 111, thereby increasing the printing density, and that can increase the impregnation into the interior of the paper base material 111 even when a resin liquid is applied from the surface side.

[0035] [Other embodiments] In the above-described embodiment, titanium paper containing titanium white (titanium oxide) is used as the paper base material 111, but the present invention is not limited to this. In another embodiment, it is also possible to use ordinary paper that does not contain titanium white (titanium oxide) as the paper base material. However, using titanium paper containing titanium white (titanium oxide) as the paper base material 111, as in the above-described embodiment, is preferable because it can improve hiding properties and suppress quality variations associated with differences in color tone between individual substrates 132.

[0036] In the above-described embodiment, the picture layer 121 is formed with inkjet ink using an inkjet printer, but the present invention is not limited to this. As another embodiment, for example, a picture layer may be formed with low-viscosity pigment ink using another printing machine such as a rotary press, and the same method as in the present embodiment can be applied.

[0037] In the above-described embodiment, the substrate 132 and the decorative paper 120 are overlapped and subjected to a heat and pressure treatment, and the substrate 132 and the decorative paper 120 are integrally bonded together by the thermosetting resin contained inside the decorative paper 120, but the present invention is not limited to this. In another embodiment, for example, the substrate 132 and the decorative paper 120 can be integrally bonded together by placing a thermosetting adhesive between them and performing a heat and pressure treatment. [Example]

[0038] Specific examples conducted to confirm the effects of the printing paper, its manufacturing method, and decorative paper and decorative board according to the present invention will be described below. However, the present invention is not limited to the specific examples described below.

[0039] [Preparation of test specimens and comparison specimens] <Test specimen 1> A treatment liquid containing an ink fixing agent in a medium liquid under the following conditions was applied to one side (front side) of a titanium paper substrate under the following conditions using a gravure printing machine, so that the treatment liquid was contained in the paper substrate. The treatment liquid was then dried in an oven (120°C) to prepare printing paper specimen 1. The treatment liquid had a solids mass (ink fixing agent mass) of 7.5 g / m2 after drying. 2 The coating was applied to the paper substrate so that the coating was as follows:

[0040] <<Processing liquid>> ·Medium liquid: water Ink fixative: calcium chloride

[0041] 《Paper base material》 Titanium paper: KJ Specialty Paper Co., Ltd.'s white printing base paper "KW-1001P" ·Basic weight: 100g / m 2

[0042] <Comparative example 1> As the paper substrate, conventional titanium paper (Technocell Premium Paper) having a receiving layer on the surface was used, and the application of the treatment liquid was omitted; that is, conventional printing paper was used as Comparative Example 1.

[0043] <Comparative body 2> No treatment liquid is applied to the paper substrate, i.e., the solid mass after drying (ink fixing agent mass) is 0 g / m 2 In other words, the titanium paper was used as the comparative printing paper 2.

[0044] [Evaluation method] <Print density (ink fixation)> The decorative paper of Test Sample 1 and Comparative Samples 1 and 2 was prepared by inkjet printing an inkjet ink (water-based pigment ink "Liojet (registered trademark)" manufactured by Toyo Ink Co., Ltd.) on the surface of the printing paper using an inkjet printer to form a pattern layer (resolution: 1200 dpi x 1200 dpi) on the surface, and the print density (ink fixation) was visually confirmed. The results are shown in Table 1 below. In Table 1, "○" indicates that the print density (ink fixation) was acceptable for practical use, and "×" indicates that the print density was unacceptable for practical use.

[0045] <Finishing condition (resin liquid impregnation)> A resin solution prepared by dissolving water-soluble methylol melamine resin (a melamine-formaldehyde initial condensate "Nikaredin (registered trademark) S-260 (product number)" manufactured by Nippon Carbide Industries Co., Ltd.) in water was applied to the surface of the decorative paper of specimen 1 and comparative specimens 1 and 2, respectively, from the design layer onwards using a coating machine. After drying in an oven, the resulting laminate was then superimposed on an MDF substrate and heated and pressed in a hot press to produce decorative boards of specimen 1 and comparative specimens 1 and 2. The melamine resin finish (resin liquid impregnation) was visually inspected. The results are shown in Table 1 below. In Table 1, "○" indicates a practically acceptable finish, and "×" indicates a practically unacceptable finish.

[0046] [Evaluation results] The evaluation results of Test Sample 1 and Comparative Samples 1 and 2 are shown in Table 1 below.

[0047] [Table 1]

[0048] As can be seen from Table 1, for Comparative Body 1, which has a receiving layer, the print density (ink fixation) was rated "○", but the finish (resin liquid impregnation) was rated "×", resulting in an overall rating of "×". On the other hand, for Comparative Body 2, which does not contain an ink fixative, the finish (resin liquid impregnation) was rated "○", but the print density (ink fixation) was rated "×", resulting in an overall rating of "×".

[0049] In contrast, for specimen 1, both the print density (ink fixation) and finish (resin liquid impregnation) were rated "good", resulting in an overall rating of "good".

[0050] Therefore, the above-described effects obtained by the present invention could be confirmed. [Industrial Applicability]

[0051] The present invention provides printing paper and its manufacturing method, as well as decorative paper and decorative board, which can increase print density and also increase internal impregnation even when a resin liquid is applied from the surface side, and can be used to great advantage in various industries including the printing industry and the construction industry. [Explanation of symbols]

[0052] 110 Printing paper 111 Paper base material 120 decorative paper 121 Picture layer 130 Decorative Panel 131 Thermosetting resin 132 PCB

Claims

1. A paper substrate; an ink fixing agent contained within the paper substrate to fix the ink on the surface of the paper substrate; A printing paper comprising:

2. The ink fixing agent is present in the gaps between the pulp fibers of the paper base material.

2. The printing paper according to claim 1.

3. The ink fixing agent contains calcium chloride.

2. The printing paper according to claim 1.

4. The paper substrate is titanium paper containing titanium oxide.

2. The printing paper according to claim 1.

5. A method for producing the printing paper according to any one of claims 1 to 4, comprising the steps of: an inclusion step of incorporating a treatment liquid containing the ink fixing agent into the paper base material; a drying step of drying the paper substrate containing the treatment liquid; A method for producing printing paper, comprising the steps of:

6. The printing paper according to any one of claims 1 to 4; a picture layer made of the ink that is fixed to the surface of the paper base material of the printing paper to form a picture; A decorative paper characterized by comprising:

7. The ink is an inkjet ink.

7. The decorative paper according to claim 6.

8. The printing paper according to any one of claims 1 to 4; a picture layer made of the ink that is fixed to the surface of the paper base material of the printing paper to form a picture; a thermosetting resin that covers the design layer and is contained within the paper base material; a substrate disposed on the back surface of the paper base material; A decorative panel characterized by comprising:

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