Decorative sheet

Abstract

To provide a decorative sheet that can prevent sound absorbency from decreasing.SOLUTION: There is provided a decorative sheet 10 including: a sound absorbing layer 1 with a void part formed inside; an adhesive layer 2 laminated on one of surfaces of the sound absorbing layer 1; an underlying layer 3 laminated on a surface of the adhesive layer 2 opposite to a surface opposed to the sound absorbing layer 1, the underlying layer having air permeability; and a printed layer 4 laminated on a surface opposite to a surface of the underlying layer 3 opposed to the adhesive layer 2 and formed by using a plurality of drops of ink landed in a dot pattern on a surface opposite to the surface of the underlying layer 3 opposed to the adhesive layer 2 and cured. The printed layer 4 is formed in a state in which a void is formed between adjacent dots.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a cosmetic sheet.

Background Art

[0002] In recent years, when conducting business meetings etc., it has become common to attend meetings from home or a telework booth using a video conferencing system etc. without having to go to the office. Since a telework booth is an enclosed space, the sound one emits may reverberate and become reverberant sound. For this reason, in order to reduce the reverberant sound, the configuration of the telework booth may be a configuration in which a cosmetic sheet having sound absorption properties is installed. As a cosmetic sheet having sound absorption properties, for example, as disclosed in Patent Document 1, there is a cosmetic sheet having a configuration including a sound absorption material and a decorative material formed on the sound absorption material. And the decorative material includes a fabric and a pattern formed by sublimation ink impregnated into the fabric.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the technique disclosed in Patent Document 1, since the pattern included in the decorative material is formed by a fabric and sublimation ink impregnated into the fabric, the sublimation ink forms a film on the decorative material. For this reason, there is a problem that the passage of sound is hindered by the film formed on the decorative material and the sound absorption property is reduced.

[0005] In view of the above-described problems, an object of the present invention is to provide a cosmetic sheet capable of suppressing a decrease in sound absorption property.

Means for Solving the Problems

[0006] In order to solve the above problems, one aspect of the present invention is a decorative sheet including a sound-absorbing layer, an adhesive layer, a base layer, and a printing layer. The sound-absorbing layer is a layer having voids formed therein. The adhesive layer is a layer laminated on one surface of the sound-absorbing layer. The base layer is a layer laminated on the surface of the adhesive layer opposite to the surface facing the sound-absorbing layer and having air permeability. The printing layer is a printing layer formed using a plurality of droplets of ink landed in a dot shape and cured on the surface of the base layer opposite to the surface facing the adhesive layer. Further, the printing layer is formed with gaps between adjacent dots.

Effects of the Invention

[0007] According to one aspect of the present invention, it is possible to provide a decorative sheet capable of suppressing a decrease in sound absorption.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Modes for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present technology will be described with reference to the drawings. In the description of the drawings, the same or similar parts are denoted by the same or similar reference numerals, and redundant explanations are omitted. Each drawing is schematic and may include cases where it is different from the actual one. The following embodiments illustrate apparatuses and methods for embodying the technical idea of the present technology, and the technical idea of the present technology is not limited to the apparatuses and methods illustrated in the following embodiments. The technical idea of the present technology can be variously modified within the technical scope described in the claims. Also, the directions of "left and right" and "up and down" in the following description are merely definitions for convenience of explanation and do not limit the technical idea of the present invention. Therefore, for example, if the paper surface is rotated by 90 degrees, "left and right" and "up and down" are read in exchange, and if the paper surface is rotated by 180 degrees, "left" becomes "right" and "right" becomes "left", of course.

[0010] (First Embodiment) Hereinafter, with reference to FIGS. 1 to 3, the configuration of the cosmetic sheet 10 in the first embodiment will be described. As shown in FIG. 1, the cosmetic sheet 10 includes a sound-absorbing layer 1, an adhesive layer 2, a base layer 3, and a printing layer 4.

[0011] <Sound-absorbing layer> The sound-absorbing layer 1 is a layer formed using polyester fibers, and a plurality of void portions are formed inside. In the first embodiment, as an example, the case where the sound-absorbing layer 1 is formed using a material in which polyester fibers are felted will be described. The thickness of the sound-absorbing layer 1 is 30 [mm] or less.

[0012] <Adhesive layer> The adhesive layer 2 is laminated on one surface (the upper surface in FIG. 1) of the sound-absorbing layer 1, and is a layer formed using an adhesive to bond the sound-absorbing layer 1 and the base layer 3. Further, the adhesive layer 2 is formed by using a spray-shaped adhesive linearly applied to one surface of the sound absorption layer 1 or a hot melt adhesive applied in a mesh shape to one surface of the sound absorption layer 1. As a result, voids are formed in the adhesive layer 2. Note that the adhesive layer 2 may be formed by using, for example, a hot melt adhesive applied in a powder form to one surface of the sound absorption layer 1.

[0013] <Base layer> The base layer 3 is laminated on the surface of the adhesive layer 2 opposite to the surface facing the sound absorption layer 1 (the upper surface in FIG. 1), and is a layer having air permeability. Further, the base layer 3 is formed by using a non-woven fabric.

[0014] The non-woven fabric is formed by using any one of polyester fibers, polypropylene fibers, rayon fibers, and nylon fibers. The diameter (outer diameter) of the fibers (any one of polyester fibers, polypropylene fibers, rayon fibers, and nylon fibers) forming the non-woven fabric is in the range of 15 [μm] or more and 30 [μm] or less.

[0015] The average visible light transmittance of the non-woven fabric is 70 [%] or less. Note that, as shown in Table 1 for example, the visible light transmittance of the non-woven fabric is measured for the dark-colored portion and the single-colored portion of the non-woven fabric, respectively. Then, the measured visible light transmittances are averaged and measured as the average transmittance of portions having different non-woven fabric thicknesses. Further, as the measuring device, for example, a spectrophotometer "UV-3600" manufactured by Shimadzu Corporation is used.

[0016]

Table 1

[0017] <Printing layer> The printing layer 4 is laminated on the surface opposite to the surface facing the adhesive layer 2 of the base layer 3 (the upper surface in FIG. 1), and as shown in FIGS. 3 and 4, it is formed using a plurality of drops of ink 4a that are landed and cured in a dot shape on the surface opposite to the surface facing the adhesive layer 2 of the base layer 3. Further, the printing layer 4 is formed with gaps between adjacent dots. In FIGS. 3 and 4, for the sake of explanation, the gaps formed between adjacent dots (ink 4a) are exaggeratedly illustrated.

[0018] The ink 4a is an ultraviolet curable ink. The dot diameter of the ink 4a is within the range of 20 [μm] or more and 60 [μm] or less.

[0019] The amount of one drop of ink 4a is within the range of 7 [pl] or more and 28 [pl] or less. As a printing method for forming the printing layer 4, for example, an inkjet printing method in which ink droplets are sprayed from an inkjet head is used.

[0020] Note that the above-described first embodiment is an example of the present invention, and the present invention is not limited to the above-described first embodiment, and various modifications can be made according to the design and the like as long as they do not deviate from the technical idea of the present invention even in forms other than this first embodiment.

[0021] (Effect of the First Embodiment) In the case of the decorative sheet 10 of the first embodiment, the effects described below can be achieved. (1) It includes a sound-absorbing layer 1 with a void formed inside, a base layer 3 having air permeability, and a printing layer 4 formed using a plurality of droplets of ink 4a landed in a dot shape and cured on the surface of the base layer 3 opposite to the adhesive layer 2. And the printing layer 4 is formed in a state where gaps are formed between adjacent dots.

[0022] Therefore, by forming the printing layer 4 with a plurality of droplets of ink 4a landed in a dot shape and cured, it is possible to suppress the formation of a film by the ink 4a, so it is possible to suppress the inhibition of the passage of sound in the base layer 3 and the printing layer 4. As a result, it is possible to provide a decorative sheet 10 capable of suppressing a decrease in sound absorption.

[0023] Also, by providing the printing layer 4, it is possible to make the design of the decorative sheet 10 into a design according to the purpose of use of the decorative sheet 10. Furthermore, since the printing layer 4 is formed in a state where gaps are formed between adjacent dots, it is possible to suppress the decrease in the air permeability of the base layer 3 due to the ink 4a. In addition, it is possible to suppress the blocking of the void formed inside the sound-absorbing layer 1 by the ink 4a. Also, it is possible to laminate the adhesive layer 2, the base layer 3, and the printing layer 4 on the sound-absorbing layer 1 having a void formed inside in a state where the void is suppressed from being blocked by the ink 4a.

[0024] Also, even when forming a decorative board by attaching the decorative sheet 10, it is possible to suppress a decrease in sound absorption without making holes in the decorative board, so it is possible to suppress a decrease in the strength of the decorative board. Also, since the printing layer 4 is formed by landing the ink 4a on the base layer 3, compared with the case of using a method having a printing process or a transfer process such as a sublimation transfer method, the number of processes can be reduced, so an increase in cost can be suppressed.

[0025] (2) The ink 4a is an ultraviolet curable ink. As a result, it becomes easier to form the printing layer 4 as compared with the case of forming the printing layer 4 using a solvent-based ink.

[0026] (3) The dot diameter of the ink 4a is in the range of 20 [μm] or more and 60 [μm] or less. As a result, it becomes possible to improve the retention rate of the ink 4a in the base layer 3.

[0027] (4) The amount of a single drop of the ink 4a is in the range of 7 [pl] or more and 28 [pl] or less. As a result, it becomes possible to improve the retention rate of the ink 4a in the base layer 3.

[0028] (5) The base layer 3 is formed using a non-woven fabric. As a result, it becomes possible to form the breathable base layer 3 using a non-woven fabric that is easy to obtain and process.

[0029] (6) The visible light transmittance of the non-woven fabric is 70 [%] or less. As a result, it becomes possible to improve the retention rate of the ink 4a on the surface of the non-woven fabric, and it becomes possible to improve the reproducibility of patterns, designs, etc. formed by the printing layer 4.

[0030] (7) The non-woven fabric is formed using any one of polyester fibers, polypropylene fibers, rayon fibers, and nylon fibers. As a result, it becomes possible to improve the sharpness of patterns, designs, etc. formed by the printing layer 4.

[0031] (8) The fiber diameter is in the range of 15 [μm] or more and 30 [μm] or less. As a result, it becomes possible to improve the retention rate of the ink 4a on the surface of the non-woven fabric as compared with a configuration where the fiber diameter is less than 15 [μm] or a configuration where the fiber diameter exceeds 30 [μm].

[0032] (9) The mass of the base layer 3 is 40 [g / m 2 or more and 50 [g / m2 is within the following range. As a result, compared with a configuration in which the mass of the base layer 3 is less than 40 [g / m 2 it is possible to reduce the reduction in the concealment of the base layer 3 and the ease of deformation of the base layer 3, and to suppress the deterioration of the reproducibility of patterns, designs, etc. formed by the printing layer 4 and the generation of wrinkles when forming the printing layer 4. In addition to this, compared with a configuration in which the mass of the base layer 3 exceeds 50 [g / m 2 it is possible to suppress the inhibition of the passage of sound in the base layer 3.

[0033] (10) The adhesive layer 2 is formed by using a spray-shaped adhesive linearly applied to one surface of the sound absorption layer 1 or a hot melt adhesive applied in a mesh shape to one surface of the sound absorption layer 1. In addition to this, voids are formed in the adhesive layer 2. As a result, it is possible to suppress the inhibition of the passage of sound in the adhesive layer 2.

[0034] (11) The sound absorption layer 1 is formed by using polyester fibers. As a result, it is possible to form the sound absorption layer 1 having voids inside using a non-woven fabric that is easy to obtain and process.

[0035] (12) The thickness of the sound absorption layer 1 is 30 [mm] or less. As a result, it becomes easy to use the decorative sheet 10 for the purpose of installing it on a wall surface.

[0036] <Modification of the First Embodiment> (1) In the first embodiment, the mass of the base layer 3 is set within the range of 40 [g / m 2 or more and 50 [g / m 2 or less, but it is not limited to this. That is, the mass of the base layer 3 may be set within the range of 30 [g / m 2 or more and 70 [g / m 2 or less. Even with this configuration, when the mass of the base layer 3 is 30 [g / m 2Compared with a configuration where it is less than, it is possible to reduce the concealment of the base layer 3 and the ease of deformation of the base layer 3, suppress the deterioration of the reproducibility of patterns, patterns, etc. formed by the printing layer 4, and suppress the generation of wrinkles when forming the printing layer 4. In addition to this, compared with a configuration where the mass of the base layer 3 exceeds 70 [g / m 2 , it is possible to suppress the inhibition of the passage of sound in the base layer 3.

Example

[0037] While referring to the first embodiment, the decorative sheets of Examples 1 and 2 and the decorative sheets of Comparative Examples 1 to 5 will be described below.

[0038] (Example 1) The sound-absorbing layer was formed using polyester fibers with a thickness of 7 [mm]. The adhesive layer was formed using a spray-type synthetic rubber-based adhesive (manufactured by Konishi Co., Ltd.: "Z-3").

[0039] The base layer used a non-woven fabric (manufactured by Asahi Kasei Corporation: Eltas E05050) formed using polyester fibers, with a mass of 50 [g / m 2 and a thickness of 0.2 [mm]. The printing layer was formed by inkjet printing (UV inkjet printing) using ultraviolet curable ink. Thus, the decorative sheet of Example 1 was formed.

[0040] (Example 2) Except that the thickness of the sound-absorbing layer was 23 [mm], it was formed in the same manner as in Example 1 to form the decorative sheet of Example 2.

[0041] (Comparative Example 1) Except that the printing layer was not formed, it was formed in the same manner as in Example 1 to form the decorative sheet of Comparative Example 1.

[0042] (Comparative Example 2) A decorative sheet of Comparative Example 2 was formed in the same manner as in Comparative Example 1, except that the thickness of the sound-absorbing layer was set to 23 [mm].

[0043] (Comparative Example 3) A decorative sheet of Comparative Example 3 was formed in the same manner as in Example 1, except that the adhesive layer, the base layer, and the printing layer were not formed. That is, the decorative sheet of Comparative Example 3 is formed only of the sound-absorbing layer.

[0044] (Comparative Example 4) A decorative sheet of Comparative Example 4 was formed in the same manner as in Comparative Example 3, except that the thickness of the sound-absorbing layer was set to 23 [mm]. That is, the decorative sheet of Comparative Example 4 is formed only of the sound-absorbing layer.

[0045] (Comparative Example 5) A decorative sheet of Comparative Example 5 was formed in the same manner as in Example 1, except that the base layer was formed using an olefin sheet having a thickness of 0.15 [mm] and the printing layer was not formed.

[0046] (Performance Evaluation) The sound-absorbing effects of the decorative sheets of Examples 1 and 2 and the decorative sheets of Comparative Examples 1 to 5 were measured and evaluated, respectively. The measurement results are shown in Table 2 and FIG. 4. The frequency range to be measured is from 400 [Hz] to 5000 [Hz]. As a method for measuring the sound-absorbing effect, two sound-absorbing materials were arranged in a small reverberation chamber of the Acoustical Society of Japan, and the reverberation chamber method sound absorption rate measurement using the impulse response in accordance with ISO354 was used.

[0047]

Table 2

[0048] (Evaluation Results) As a result of evaluating various performances using the method described above, as shown in FIG. 4, it was confirmed that the decorative sheets of Examples 1 and 2 have a high sound absorption rate in the region corresponding to the human voice as compared with the decorative sheets of Comparative Examples 1 to 5. In addition, it was confirmed that the decorative sheets (Examples 1 and 2) provided with a printing layer have the same sound absorption rate as the decorative sheets (Comparative Examples 1 and 2) not provided with a printing layer.

[0049] In addition, the decorative sheets (Examples 1 and 2, Comparative Examples 1 and 2) in which the base layer was formed using a polyester non-woven fabric were compared with the decorative sheet (Comparative Example 5) in which the base layer was formed using an olefin sheet. Since the olefin sheet has no air permeability, it was confirmed that the decorative sheet of Comparative Example 5 has a low sound absorption rate on the high wavelength side. In FIG. 4, the vertical axis represents the sound absorption rate (reverberation room method sound absorption rate) measured using the reverberation room method sound absorption rate measurement, and the horizontal axis represents the center frequency (1 / 3 octave band center frequency) of the band (band) in 1 / 3 octave. The 1 / 3 octave band center frequency corresponds to the "frequency" in Table 2.

[0050] Note that the present technology can adopt the following configurations. (1) A sound absorption layer having a void portion formed therein, An adhesive layer laminated on one surface of the sound absorption layer, A base layer laminated on the surface of the adhesive layer opposite to the surface facing the sound absorption layer and having air permeability, A printing layer laminated on the surface of the base layer opposite to the surface facing the adhesive layer and formed using a plurality of drops of ink landed in a dot shape and cured on the surface of the base layer opposite to the surface facing the adhesive layer, and The printing layer is a decorative sheet formed in a state where a gap is formed between adjacent dots. (2) The ink is an ultraviolet curable ink, and the decorative sheet according to (1) above. (3) The dot diameter of the ink is in the range of 20 μm or more and 60 μm or less, and the decorative sheet according to (1) or (2) above. (4) The amount of one drop of the ink is in the range of 7 pl or more and 28 pl or less, and the decorative sheet according to any one of (1) to (3) above. (5) The base layer is the cosmetic sheet according to any one of (1) to (4) above, formed using a non-woven fabric. (6) The cosmetic sheet according to (5) above, wherein the average visible light transmittance of the non-woven fabric is 70% or less. (7) The cosmetic sheet according to (5) or (6) above, wherein the non-woven fabric is formed using any one of polyester fibers, polypropylene fibers, rayon fibers, and nylon fibers. (8) The cosmetic sheet according to (7) above, wherein the diameter of the fiber is in the range of 15 μm or more and 30 μm or less. (9) The mass of the base layer is 30 g / m 2 or more and 70 g / m 2 or less, and is the cosmetic sheet according to any one of (1) to (8) above. (10) The mass of the base layer is 40 g / m 2 or more and 50 g / m 2 or less, and is the cosmetic sheet according to (9) above. (11) The adhesive layer is formed using a spray adhesive applied linearly to one surface of the sound absorption layer or a hot melt adhesive applied in a mesh pattern to one surface of the sound absorption layer, and has voids formed therein. The cosmetic sheet according to any one of (1) to (10) above. (12) The sound absorption layer is formed using polyester fibers, and is the cosmetic sheet according to any one of (1) to (11) above. (13) The thickness of the sound absorption layer is 30 mm or less, and is the cosmetic sheet according to any one of (1) to (12) above.

Explanation of symbols

[0051] 1... Sound absorption layer, 2... Adhesive layer, 3... Base layer, 4... Printing layer, 4a... Ink, 10... Cosmetic sheet

Claims

1. A sound absorbing layer having a void formed therein; An adhesive layer laminated on one surface of the sound absorbing layer; a base layer having air permeability, the base layer being laminated on a surface of the adhesive layer opposite to the surface facing the sound absorbing layer; a printing layer that is laminated on a surface of the base layer opposite to the surface facing the adhesive layer, and that is formed using a plurality of droplets of ink that are deposited in a dot shape on the surface of the base layer opposite to the surface facing the adhesive layer and cured; The printed layer is a decorative sheet formed with gaps between adjacent dots.

2. 2. The decorative sheet according to claim 1, wherein said ink is an ultraviolet-curable ink.

3. 2. The decorative sheet according to claim 1, wherein the ink dot diameter is within a range of 20 [mu]m to 60 [mu]m.

4. 2. The decorative sheet according to claim 1, wherein the amount of one drop of said ink is within the range of 7 pl to 28 pl.

5. 2. The decorative sheet according to claim 1, wherein said undercoat layer is formed using a nonwoven fabric.

6. 6. A decorative sheet according to claim 5, wherein the average visible light transmittance of said nonwoven fabric is 70% or less.

7. 6. The decorative sheet according to claim 5, wherein said nonwoven fabric is formed using any one of polyester fibers, polypropylene fibers, rayon fibers, and nylon fibers.

8. 8. The decorative sheet according to claim 7, wherein the diameter of said fibers is within the range of 15 μm to 30 μm.

9. The mass of the undercoat layer is 30 g / m ２ 70g / m or more ２ 2. The decorative sheet according to claim 1, wherein the content of the decorative sheet is within the following range:

10. The mass of the undercoat layer is 40 g / m ２ 50g / m or more ２ 10. The decorative sheet according to claim 9, wherein the content is within the following range:

11. 2. The decorative sheet according to claim 1, wherein the adhesive layer is formed using a spray-type adhesive applied in a line shape to one surface of the sound-absorbing layer, or a hot melt adhesive applied in a mesh shape to one surface of the sound-absorbing layer, and has voids formed therein.

12. 2. The decorative sheet according to claim 1, wherein said sound absorbing layer is formed using polyester fibers.

13. 2. The decorative sheet according to claim 1, wherein the sound absorbing layer has a thickness of 30 mm or less.

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