JP2016069800A - Decorative sheet and decorative material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a decorative sheet capable of keeping reflected light from a bottom of a recessed part, at the same time allowing the recessed part on a decorative sheet surface and portions other than the recessed part to be distinguished.SOLUTION: A decorative sheet has a matte surface on at least one of the surfaces thereof, with a plurality of recesses on the surface on the matte surface side, and at least a part of the recesses has a bottom part with irregularities. Arithmetic average roughness Racalculated by an equation of JIS B 0601:2001 using height data of a cross-section curve in any direction of the irregularities of the recess, and arithmetic average roughness Raof a portion other than the recess on the surface with irregularities of the decorative sheet calculated by an equation of JIS B 0601:2001 using height data of a cross-section curve in a direction parallel to the any direction satisfy the following equation (1): 0.60≤Ra/Ra≤0.96...(1).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a decorative sheet and a decorative material.

In building materials, furniture, home appliances, etc., a decorative sheet is generally used to decorate the members to be used.
In order to improve the designability of these decorative sheets, a concave portion having a predetermined pattern (for example, a wood pattern conduit pattern) may be formed on the embossed plate.
However, in a decorative sheet in which concave portions having a predetermined pattern are formed with an embossed plate, the light reflected at the bottom of the concave portions may appear strong, and this reflected light causes a decrease in design.

Therefore, there is a demand for a decorative sheet in which the bottom of the concave portion has a low gloss.
On the other hand, in order to reduce glare caused by regular reflection of external light on the surface of the decorative sheet, it is also required to reduce the gloss of the entire decorative sheet.
As a decorative sheet that can satisfy the above requirements, a decorative sheet in which a concave portion is formed using an embossed plate that has been sandblasted has been proposed (Patent Document 1).

JP 2010-100030 A

  According to the technique of Patent Document 1, the surface of the decorative sheet and the bottom of the recess can be made low-gloss. However, the decorative sheet in which the concave portion is formed using the sandblasted embossed plate as in Patent Document 1 is difficult to distinguish between the concave portion and the portion other than the concave portion, and has a sharp appearance with no overall sharpness. There was a problem that the effect of improving the design by the formation of the recess could not be obtained.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a decorative sheet and a decorative material that make the reflected light at the bottom of a concave portion inconspicuous and can distinguish between a concave portion and a portion other than the concave portion on the surface of the decorative sheet and are excellent in design.

  In order to solve the above problems, the present inventors provide the following decorative sheets and cosmetic materials [1] to [16].

[1] A decorative sheet having a plurality of recesses on at least one surface, wherein at least a part of the recesses has an uneven shape on the bottom,
About the arithmetic mean roughness Ra _DEP calculated according to the calculation formula of JIS B0601: 2001 from the height data of the cross-sectional curve in any direction of the concave-convex shape of the concave portion, and the portions other than the concave portion on the surface of the decorative sheet, A decorative sheet in which the arithmetic average roughness Ra _SUR calculated according to the calculation formula of JIS B0601: 2001 from the height data of the cross-sectional curve in a direction parallel to the arbitrary direction satisfies the following condition (1).
0.60 ≦ Ra _DEP / Ra _SUR ≦ 0.96 (1)
[2] The decorative sheet according to [1], wherein the Ra _DEP satisfies the following condition (1 ′).
3.5 μm ≦ Ra _DEP ≦ 10.0 μm (1 ′)

[3] A direction parallel to the arbitrary direction with respect to the average inclination angle θa _DEP calculated from the height data of the cross-sectional curve in the arbitrary direction of the concave-convex shape of the concave portion and the surface of the decorative sheet other than the concave portion The decorative sheet according to [1] or [2], wherein the average inclination angle θa _SUR calculated from the height data of the cross-section curve satisfies the following condition (2).
θa _DEP / θa _SUR ≦ 0.80 (2)
[4] The decorative sheet according to [3], wherein the θa _DEP satisfies the following condition (2 ′).
17.0 degrees ≦ θa _DEP ≦ 27.0 degrees (2 ′)

[5] The average length RSm _DEP of the roughness curve element calculated according to the calculation formula of JIS B0601: 2001 from the height data of the cross-sectional curve in any direction of the concave-convex shape of the concave portion, and the surface of the decorative sheet The average length RSm _SUR of the roughness curve element calculated according to the calculation formula of JIS B0601: 2001 from the height data of the cross-sectional curve in the direction parallel to the arbitrary direction for the portion other than the concave portion is the following condition ( A decorative sheet according to any one of the above [1] to [4], which satisfies 3).
1.20 ≦ RSm _DEP / RSm _SUR (3)
[6] The decorative sheet according to [5], wherein the RSm _DEP satisfies the following condition (3 ′).
80.0μm ≦ RSm _DEP (3 ')

[7] The decorative sheet according to any one of [1] to [6], wherein the concave portion has a minor axis and a major axis, and a direction parallel to the major axis is the arbitrary direction.
[8] The decorative sheet according to [7], wherein the average length of the major axis of the recess is 2 to 50 mm.
[9] The decorative sheet according to the above [7] or [8], wherein an average length of the minor axis of the recess is 0.1 to 10 mm.
[10] The decorative sheet according to any one of [7] to [9], wherein the plurality of recesses are arranged so that the major axes thereof are substantially parallel to each other.
[11] The decorative sheet according to any one of [1] to [10], wherein an average of the maximum depths of the recesses is 40 to 200 μm.
[12] The decorative sheet according to any one of the above [1] to [11], which has a surface protective layer on a substrate and has the concave portion on the surface of the surface protective layer.
[13] The decorative sheet according to [12], in which a design layer is provided between the substrate and the surface protective layer.
[14] The decorative sheet according to [13], wherein the design layer includes a wood grain pattern.
[15] A decorative material obtained by laminating and integrating an adherend and a surface of the decorative sheet according to any one of [1] to [14] on the side opposite to the surface having the concave portion.
[16] The decorative material according to [15], which is used as a decorative material for floors.

  The decorative sheet and the decorative material of the present invention can make the reflected light at the bottom of the concave portion inconspicuous and can distinguish between the concave portion and the portion other than the concave portion on the surface of the decorative sheet, so that the design can be made extremely good.

It is sectional drawing which shows one Embodiment of the decorative sheet of this invention. It is a figure explaining the measurement direction of the height data of the uneven | corrugated shaped cross-section curve of a recessed part bottom part. It is a top view which shows embodiment of the shape of the convex part of a recessed part bottom part, and an arrangement | sequence pattern. It is a functional block diagram of a height data processing device.

[Decorative sheet]
The decorative sheet of the present invention is a decorative sheet having a plurality of recesses on at least one surface, and at least a part of the recesses has an uneven shape on the bottom,
About the arithmetic mean roughness Ra _DEP calculated according to the calculation formula of JIS B0601: 2001 from the height data of the cross-sectional curve in any direction of the concave-convex shape of the concave portion, and the portions other than the concave portion on the surface of the decorative sheet, The arithmetic average roughness Ra _SUR calculated according to the calculation formula of JIS B0601: 2001 from the height data of the sectional curve in the direction parallel to the arbitrary direction satisfies the following condition (1).
0.60 ≦ Ra _DEP / Ra _SUR ≦ 0.96 (1)

FIG. 1 is a cross-sectional view showing an embodiment of the decorative sheet 10 of the present invention. 1 has a design layer 2, an adhesive layer 3, a thermoplastic resin layer 4 and a surface protective layer 5 on one surface of a substrate 1, and a surface on the surface protective layer 5 side. A recess 6 is formed, and an uneven shape is formed at the bottom of the recess 6.
The decorative sheet of the present invention has a plurality of recesses on at least one surface, and at least a part of the recesses has an uneven shape on the bottom, and satisfies the condition (1). The layers shown in FIG. 1 are optional constituent elements.

Condition (1)
Condition (1) is that the ratio (Ra _DEP / Ra _SUR ) between the arithmetic average roughness Ra _DEP of the concaves and convexes at the bottom of the concave part and the arithmetic average roughness Ra _SUR of parts other than the concave part on the decorative sheet surface is 0.60. It is above and is 0.96 or less.
The arithmetic average roughness Ra is an element related to the width of the angle distribution (diffuse reflection intensity distribution) of the reflected light. When the ratio of Ra exceeds 0.96, the diffuse reflection intensity distribution at the bottom of the concave portion and the diffuse reflection intensity distribution at the portion other than the concave portion are similar to each other, and the gloss feeling between the concave portion and the portion other than the concave portion is similar. However, it becomes difficult to distinguish between the two parts, and the design property is lowered. On the other hand, when the ratio of Ra exceeds 0.96, the degree that the concave portion appears to sink into a portion other than the concave portion is reduced. On the other hand, when the ratio of Ra is 0.96 or less, the diffusion of the concave portion is smaller than that of the portion other than the concave portion, so that the whiteness of the concave portion is reduced and the concave portion is easily recognized as sinking. This action is extremely effective when, for example, the concave portion has a wood conduit pattern.
On the other hand, when the ratio of Ra is less than 0.60, the reflection intensity in the specular reflection direction at the bottom of the recess is greater than the reflection intensity in the specular reflection direction at locations other than the recess, and the reflected light at the bottom of the recess is noticeable. , It will make the viewer uncomfortable.

Condition (1) preferably satisfies 0.65 ≦ Ra _DEP / Ra _SUR ≦ 0.95, more preferably satisfies 0.70 ≦ Ra _DEP / Ra _SUR ≦ 0.94, and 0.75 ≦ Ra More preferably, _DEP / Ra _SUR ≦ 0.93 is satisfied.
In addition, in the embossed plate that has been sandblasted as an example of the prior art, the bottom of the concave portion and the portion other than the concave portion on the surface of the decorative sheet have substantially the same shape, so the condition (1) and the conditions (2) and ( 3), (4), (5) cannot be satisfied.

In the present invention, the condition (1) and other conditions described later may be satisfied in any direction. For example, when a decorative sheet is used as a flooring, the direction perpendicular to the window (the direction in which sunlight is inserted from the window) is important in that it has a strong diffuse reflection intensity and is easy to recognize the reflected light. The vertical direction (the direction in which a person walks toward the door) is important in that it easily enters the human field of view. Therefore, in any direction of the decorative sheet, if the condition (1) and other conditions described later are satisfied, the effect of each condition can be sufficiently exhibited in the direction.
In addition, the condition (1) does not need to satisfy all of the recesses present in the decorative sheet of the present invention, but preferably 80% or more of the recesses are satisfied, and 90% or more of the recesses are satisfied. It is more preferable that 95% or more of the recesses are filled. Regarding other conditions described later, it is preferable that 80% or more of the recesses are satisfied, more preferably 90% or more of the recesses are satisfied, and more preferably 95% or more of the recesses are satisfied.

In the present invention, the surface properties such as Ra of the concave-convex shape of the concave portion, which is an element for determining the condition (1) and other conditions described later, are the average values of the measured values of the twenty concave portions. In measurement, the measurement is performed so that the measurement directions of the individual recesses are parallel to each other (all measurement directions are matched). For example, the measurement directions of the two recesses in FIG. 2 are unified with the measurement directions described in FIG.
In the case where a plurality of recesses are arranged substantially parallel on the surface of the decorative sheet, when the recesses have a shape having a major axis and a minor axis, it is preferable to measure in the major axis direction of the recesses (recesses of the recesses). In the major axis direction, the condition (1) and other conditions described later are preferably satisfied).

The measured values of the surface properties such as Ra of the individual recesses are calculated as shown in the following (A) to (C). In the following description, Ra is taken as an example, but the same applies to other surface properties such as the average inclination angle θa.
(A) A parallel line that divides the concave portion into four is drawn in a direction (width direction) orthogonal to the measurement direction. (For example, the three dotted lines in FIG. 2 are parallel lines that divide the concave portion into four in the width direction.)
(B) The height data of the sectional curve of the concavo-convex shape when the concave portion is cut perpendicular to the three parallel lines is measured.
(C) Ra is calculated from the height data of the individual cross-sectional curves, and the average value of the calculated values of the three cross-sectional curves is taken as the measured value of Ra of the recess.

  Moreover, in this invention, surface properties, such as Ra of locations other than the recessed part of the decorative sheet surface used as an element which determines conditions (1) and the other conditions mentioned later, are taken as the average value of 20 measured values.

  In the present invention, the height data of the cross-sectional curve can be measured by, for example, a three-dimensional shape analyzer. The measurement length is 1 mm. A specific measurement method will be described later.

Condition (1 ')
In the decorative sheet of the present invention, Ra _DEP preferably satisfies the following condition (1 ′).
3.5 μm ≦ Ra _DEP ≦ 10.0 μm (1 ′)
By setting Ra _DEP to 3.5 μm or more, the range of the angle distribution (diffuse reflection intensity distribution) of the light reflected at the bottom of the recess can be expanded, and the reflection intensity in the specular reflection direction becomes too strong. It is easier to prevent the person from feeling uncomfortable.
In addition, by setting Ra _DEP to 10.0 μm or less, it is possible to easily suppress whitening due to the spread of the diffuse reflection intensity distribution due to the unevenness having a large inclination angle. Furthermore, by setting Ra _DEP to 10.0 μm or less, it is possible to prevent the concave portion from appearing to sink due to the fact that the concave portion is recognized as white that appears due to the presence of a very large diffusion angle. It can be done easily.
Condition (1 ′) preferably satisfies 4.0 μm ≦ Ra _DEP ≦ 9.5 μm, more preferably satisfies 5.0 μm ≦ Ra _DEP ≦ 9.0 μm, and 6.0 μm ≦ Ra _DEP ≦ 8.0 μm. It is further preferable to satisfy

Condition (2)
Further, the decorative sheet of the present invention has the average inclination angle θa _DEP calculated from the height data of the cross-sectional curve in the arbitrary direction of the concave-convex shape of the concave part, and the arbitrary part of the decorative sheet on the surface other than the concave part. It is preferable that the average inclination angle θa _SUR calculated from the height data of the cross-sectional curve in the direction parallel to the direction satisfies the following condition (2).
θa _DEP / θa _SUR ≦ 0.80 (2)

By setting θa _DEP / θa _SUR to 0.80 or less, the diffuse reflection intensity distribution at the bottom of the concave portion and the diffuse reflection intensity distribution at a portion other than the concave portion are more clearly distinguished. The distinction can be made easier. Further, by setting θa _DEP / θa _SUR to 0.80 or less, the concave portions appear to sink more than the portions other than the concave portions. For example, the design of the concave portions having a wood grain conduit pattern can be made extremely good. In addition, although the condition (1) is satisfied, it is difficult to satisfy the condition (2) when the unevenness at the bottom of the concave portion has a shape in which the intervals between the peaks are short and individual peaks are formed.
Condition (2) more preferably satisfies θa _DEP / θa _SUR ≦ 0.70, and more preferably satisfies θa _DEP / θa _SUR ≦ 0.65.
Note that if the value of θa _DEP / θa _SUR is too small, it is difficult to satisfy the condition (1). Therefore, θa _DEP / θa _SUR is preferably 0.40 or more, and more preferably 0.50 or more. preferable.

θa _DEP and θa _SUR can be calculated by calculating the inclination angle of each measurement section from the interval of each measurement section of the height data and the elevation difference of each measurement section, and averaging the values of all measurement sections.

Condition (2 ')
The θa _DEP preferably satisfies the following condition (2 ′).
17.0 degrees ≦ θa _DEP ≦ 27.0 degrees (2 ′)
By satisfying the condition (2 ′), the reflected light at the bottom of the concave portion can be further suppressed, and the appearance of the concave portion can be further reduced.
The condition (2 ′) more preferably satisfies 17.5 ° ≦ θa _DEP ≦ 25.0 °, and more preferably satisfies 18.0 ° ≦ θa _DEP ≦ 23.0 °.

Condition (3)
Further, the decorative sheet of the present invention, the average length RSm _DEP of the roughness curve element calculated according to the formula of JIS B0601: 2001 from the height data of the cross-sectional curve in any direction of the concave-convex shape of the recess, The average length RSm of the roughness curve element calculated according to the formula of JIS B0601: 2001 from the height data of the cross-sectional curve in the direction parallel to the arbitrary direction for the portion other than the concave portion on the surface of the decorative sheet. It is preferable that _SUR satisfies the following condition (3).
1.20 ≦ RSm _DEP / RSm _SUR (3)

RSm represents the pitch of the projections and depressions, and when RSm is small (the pitch of the projections and depressions is small), the inclination angle of the projections and depressions is large and the diffuse reflection intensity distribution tends to be widened. In other words, even when the condition (1) is satisfied, the diffuse reflection intensity distribution of the concave portion is widened so that RSm _DEP is not sufficiently larger than RSm _SUR , and the appearance of the concave portion and the portion other than the concave portion is gradually distinguished. It becomes difficult.
For this reason, setting RSm _DEP / RSm _SUR to 1.20 or more is preferable in terms of facilitating the distinction between the appearances of the recesses and the portions other than the recesses. Further, by setting RSm _DEP / RSm _SUR to 1.20 or more, the concave portion appears to be further depressed, and for example, the design of the concave portion having a wood grain conduit pattern can be made extremely good.
When RSm _DEP / RSm _SUR is too large, each of the concave and convex portions of the recess is easily recognized. Therefore, RSm _DEP / RSm _SUR is preferably not increased more than necessary.
Therefore, the condition (3) preferably satisfies 1.20 ≦ RSm _DEP / RSm _SUR ≦ 3.00, more preferably satisfies 1.30 ≦ RSm _DEP / RSm _SUR ≦ 2.50. More preferably, 50 ≦ RSm _DEP / RSm _SUR ≦ 2.30 is satisfied.

Condition (3 ')
In the decorative sheet of the present invention, RSm _DEP preferably satisfies the following condition (3 ′).
80μm ≦ RSm _DEP (3 ')
When the RSm _DEP is 80 μm or more, the pitch of the concave and convex portions at the bottom of the concave portion is increased, and the inclination angle of the concave and convex portions is reduced, so that the diffuse reflection intensity distribution at the bottom of the concave portion can be further prevented and the concave portion is raised. It is possible to further prevent the concave portion from appearing to sink due to being recognized as such whiteness.

In addition, application | coating of the coating agent containing sandblasting and a mat agent is mentioned as a typical method which provides an unevenness | corrugation. When the uneven shape is formed by these methods, it is difficult to increase the RSm _DEP as in the condition (3 ′). In the present invention, for example, the condition (3) can be satisfied by using a special embossed plate as will be described later.
In addition, when the RSm _DEP is too large, each of the concave and convex portions of the concave portion is easily recognized. Therefore, the RSm _DEP is preferably not increased more than necessary.
Therefore, the condition (3 ′) more preferably satisfies 85 μm ≦ RSm _DEP ≦ 200 μm, more preferably satisfies 90 μm ≦ RSm _DEP ≦ 180 μm, and still more preferably satisfies 90 μm ≦ RSm _DEP ≦ 150 μm.

Other Conditions The decorative sheet of the present invention has a ten-point average roughness Rzjis _DEP calculated according to the calculation formula of JIS B0601: 2001 from the height data of the cross-sectional curve in any direction of the concave and convex shape of the concave portion, It is preferable to satisfy the following condition (4).
Rzjis _DEP ≦ 50.0μm (4)
The ten-point average roughness (Rzjis) is the sum of the average of the peak height from the highest peak to the fifth highest in the roughness curve and the average of the valley depth from the deepest valley bottom to the fifth deepest. As described above, Rzjis is a value that focuses on a portion having a high elevation and a portion having a low elevation in the roughness curve. On the other hand, the arithmetic average roughness (Ra) is an average value of the elevation of the entire roughness curve. That is, it can be said that Rz represents the degree of roughness of the roughness curve as in Ra, but represents the randomness of the roughness of the roughness curve.

By setting the Rzjis _DEP to 50.0 μm or less, it is possible to suppress the randomness of the unevenness and make it difficult to cause unevenness in the appearance of the recess. Further, when the irregularity of the irregular shape is strong, it tends to look like an artificial object. However, when Rzjis _DEP is set to a predetermined value or more, the appearance of the depression can be given a natural feeling due to the irregularity of the irregularity. Further, when Rzjis _DEP is set to a predetermined value or more, it is preferable in that the defect of the decorative sheet can be made inconspicuous.
Therefore, condition (4) is more preferable to satisfy the 20.0μm ≦ Rzjis _DEP ≦ 45.0μm, it is more preferable to satisfy the 30.0μm ≦ Rzjis _DEP ≦ 40.0μm.

Further, from the viewpoint of making it easier to exert the effect of the condition (4), it is preferable that the ratio of the Rzjis _DEP to the Ra _DEP satisfies the following condition (5).
Rzjis _DEP / Ra _DEP ≦ 7.0 (5)
The condition (5) more preferably satisfies 3.0 ≦ Rzjis _DEP / Ra _DEP ≦ 6.0, and more preferably satisfies 4.0 ≦ Rzjis _DEP / Ra _DEP ≦ 5.5.

In addition, the 10-point average roughness Rzjis _SUR calculated according to the calculation formula of JIS B0601: 2001 from the height data of the cross-sectional curve in the direction parallel to the arbitrary direction for the portions other than the concave portion on the surface of the decorative sheet is: From the viewpoint of ease of distinguishing between the recesses and portions other than the recesses, Rzjis _DEP is preferably larger.
In addition, from the viewpoint of ease of distinguishing between the concave portions and the portions other than the concave portions, it is preferable that Rzjis _DEP and Rzjis _SUR satisfy the following condition (6).
0.68 ≦ Rzjis _DEP / Rzjis _SUR ≦ 0.95 (6)
The condition (6) more preferably satisfies 0.70 ≦ Rzjis _DEP / Rzjis _SUR ≦ 0.93, and more preferably satisfies 0.75 ≦ Rzjis _DEP / Rzjis _SUR ≦ 0.92.

The shape of the recess The shape of the recess includes, for example, a wood grain conduit pattern, a hairline, and a satin finish. The size, pitch, etc. of the recesses cannot be generally described because they differ depending on the shape of the recesses, etc., but in the case of a wood grain conduit pattern, the average width of the recesses (average of the minor axis) is 0.1-10 mm, the length of the recesses It is preferable that the average length (average major axis) is 2 to 50 mm, the average maximum depth of the recesses is 40 to 200 μm, and the average interval between adjacent recesses (the average pitch) is 0.2 to 2 mm. The average of the width of the recess (average of the minor axis) is 0.2 to 5 mm, the average of the length of the recess (average of the major axis) is 3 to 30 mm, the average of the maximum depth of the recess is 50 to 150 μm, The average interval (average pitch) is more preferably 0.3 to 1.5 mm. In addition, let these average values be the average value of 20 recessed parts arbitrarily selected in the range of 10 cm < ² >.
Moreover, it is preferable to arrange | position a recessed part so that the major axis of a recessed part may become substantially parallel on the surface of a decorative sheet. “Substantially parallel” means that the major axis difference is within 30 degrees, preferably within 15 degrees, and more preferably within 5 degrees.

  The decorative sheet having the concave portions on the surface can be formed by performing an embossing treatment with an embossing plate on a base material or a layer formed on the base material, or molding with a mold. In the case of molding with a mold, it may be difficult to take out the fine uneven shape from the mold, and thus embossing with an embossed plate is preferable.

Embossed plate Conventional embossed plate is developed, corroded, and resist stripped on copper base material to form a textured pattern such as wood grain conduit pattern, hairline, pear texture, etc. We used what we did.
However, when an untreated embossed plate that has not been sandblasted is used, the concave and convex shape cannot be imparted to the bottom of the concave portion, and the reflection intensity in the specular reflection direction at the bottom of the concave portion becomes too strong, and is visually The person who feels uncomfortable In addition, when embossing is performed on a layer having surface irregularities using an unprocessed embossing plate, some irregularities remain in the recesses, but the irregularities are crushed by the pressure during embossing to suppress the reflection intensity in the regular reflection direction. I can't. In addition, when an embossed plate that has been sandblasted is used, the shape of the recesses and the portions other than the recesses is approximately the same (the gloss is approximately the same), and the recesses are difficult to recognize and the design cannot be improved. Further, when an embossed plate that has been sandblasted is used, the concave portions are likely to be whitened, and the concave portions sink and become invisible.

In order to satisfy the above-described condition (1) and other conditions, it is preferable to use an embossed plate in which a fine uneven pattern is formed on the convex portion of the embossed plate (the portion corresponding to the concave portion of the decorative sheet). For example, (A) The laser irradiation pattern programmed in the CAM software is incorporated into this embossed plate, and the masking of the embossed plate masked with lacquer is partially removed, and then the copper plating on the surface of the embossed plate is etched. It can be produced by repeating a series of steps several times or by (B) incorporating a programmed engraving pattern in CAM software and engraving directly on an embossed plate using a large CNC compound lathe.
In addition, even if it uses the embossing plate from which the unevenness | corrugation of a convex part differs from the unevenness | corrugation of a flat part by sandblasting on the conditions from which the convex part and flat part of an embossing plate differed using masking, the above-mentioned conditions ( 1) and other conditions may be met. However, it is difficult to control the interval between the concaves and convexes by the sandblasting process, and it is difficult to control (3) and (3 ′) among the above-mentioned conditions. Therefore, it corresponds to the convex part of the embossed plate (the concave part of the decorative sheet). An embossed plate in which a fine concavo-convex pattern is formed on the part) is more preferable.

  As a pattern of the convex part of the embossed plate, a shape in which a wood grain conduit pattern, a hairline, a satin texture, etc. are reversed can be cited. What is necessary is just to determine the magnitude | size, pitch, etc. of a convex part according to the magnitude | size etc. of the target recessed part. In the embossing process, the uneven shape of the embossed plate is not reflected in the decorative sheet as it is (the uneven shape of the decorative sheet tends to have a lower height or a smaller inclination angle than the uneven shape of the embossed plate. There is a need to consider this point.

Examples of the fine concavo-convex pattern provided on the convex portion of the embossed plate include oblique lines, crosshairs, hemispheres, and polyhedra as shown in FIGS.
The height, width, and pitch (interval between peaks of convex portions) of the fine uneven pattern may be in a range that satisfies the above conditions (1) and (2), and other conditions described above may be set as necessary. The range may be satisfied. The fine concavo-convex pattern preferably has a height of 5 μm or more, a depth of the concave portion or less, a width of 15 to 390 μm, and a pitch (a peak interval between convex portions) of 20 to 400 μm. The fine concavo-convex pattern preferably has a height of 10 to 100 μm, a width of 20 to 290 μm, and a pitch (a peak interval between convex portions) of 30 to 300 μm.

The base material is not particularly limited, and examples thereof include plastic films such as polyester, polyolefin, and polyvinyl chloride, papers, and composites thereof. Among these, a polyolefin resin sheet is preferable. Examples of the polyolefin resin include polyethylene resin, polypropylene resin, polybutene resin, ethylene / propylene copolymer resin, ethylene / propylene / butene copolymer resin, and olefin thermoplastic elastomer. From the viewpoint of surface protection properties such as weather resistance and scratch resistance, polypropylene resin is preferred. These base materials may be colored from the viewpoint of design properties.
Moreover, when using a plastic film as a base material, the biaxially stretched thing is suitable from a viewpoint of mechanical strength.
The thickness of the substrate is preferably 20 to 200 μm, more preferably 40 to 160 μm, and still more preferably 40 to 100 μm from the viewpoint of mechanical strength and handleability.
The total thickness of the decorative sheet is preferably 40 to 1000 μm, more preferably 80 to 750 μm, and further preferably 100 to 500 μm.

  Preferred examples of the polypropylene resin include homopolypropylene resins, random polypropylene resins, block polypropylene resins, and α-olefin copolymers having 2 to 20 carbon atoms other than propylene and having a crystal part of polypropylene. In addition, a propylene-α-olefin copolymer containing 15 mol% or more of ethylene, 1-butene, 1-hexene, 1-octene, 3-methyl-1-butene, 4-methyl-1-pentene, etc., for example, ethylene / Also included are propylene copolymers, ethylene / propylene / butene copolymers, and the like.

Examples of papers used for the substrate include thin paper, kraft paper, and titanium paper. These paper base materials are used to reinforce the interlaminar strength between the fibers of the paper base material or between the other layers and the paper base material, and to prevent the occurrence of scuffing, in addition to these paper base materials, acrylic resin, styrene butadiene rubber, A resin such as a melamine resin or a urethane resin may be added (resin impregnation after paper making or embedded during paper making). For example, inter-paper reinforced paper, resin-impregnated paper, and the like.
In addition to these, various papers often used in the field of building materials such as linter paper, paperboard, base paper for gypsum board, or a vinyl wallpaper raw material in which a vinyl chloride resin layer is provided on the surface of the paper can be mentioned. Furthermore, coated paper, art paper, sulfate paper, glassine paper, parchment paper, paraffin paper, Japanese paper, or the like used in the office field or normal printing and packaging can also be used. Moreover, although distinguished from these papers, woven fabrics and non-woven fabrics of various fibers having an appearance and properties similar to paper can be used as the base material. Examples of various fibers include inorganic fibers such as glass fibers, asbestos fibers, potassium titanate fibers, alumina fibers, silica fibers, and carbon fibers, or synthetic resin fibers such as polyester fibers, acrylic fibers, and vinylon fibers.

Surface protective layer The surface protective layer is provided on the substrate for the purpose of improving the scratch resistance of the decorative sheet and protecting the decorative layer when the decorative sheet has the decorative layer.
The surface protective layer preferably contains a resin component. Moreover, it is preferable that a surface protective layer contains particle | grains from a viewpoint of making it easy to satisfy | fill each conditions mentioned above.

Although the total thickness of the surface protective layer varies depending on the shape of the recess and the configuration of the layer (thermoplastic resin layer etc.) located closer to the substrate than the surface protective layer, it cannot be said unconditionally. Preferably, it is 1 to 45 μm, more preferably 3 to 35 μm.
For example, the thickness of the surface protective layer is determined by measuring the thickness of 20 locations from an image of a cross section taken using a transmission electron microscope (TEM) or a scanning transmission electron microscope (STEM). It can be calculated. When the film thickness to be measured is on the order of μm, it is preferable to use SEM, and when it is on the order of nm, it is preferable to use TEM or STEM. In the case of SEM, the acceleration voltage is preferably 1 to 10 kV and the magnification is preferably 1000 to 7000 times. In the case of TEM or STEM, the acceleration voltage is preferably 10 to 30 kV and the magnification is preferably 50,000 to 300,000 times. The thickness of a design layer and a concealing layer, which will be described later, can be calculated in the same manner.

  The resin component of the surface protective layer preferably includes a thermosetting resin composition or an ionizing radiation curable resin composition, and more preferably includes an ionizing radiation curable resin composition from the viewpoint of improving mechanical strength. Among them, it is more preferable to include an electron beam curable resin composition among them.

The thermosetting resin composition is a composition containing at least a thermosetting resin, and is a resin composition that is cured by heating.
Examples of the thermosetting resin include acrylic resin, urethane resin, phenol resin, urea melamine resin, epoxy resin, unsaturated polyester resin, and silicone resin. In the thermosetting resin composition, a curing agent is added to these curable resins as necessary.

  The ionizing radiation curable resin composition is a resin composition that is cured by irradiation with ionizing radiation. The ionizing radiation means an electromagnetic wave or a charged particle beam having an energy quantum capable of polymerizing or cross-linking molecules, and usually ultraviolet (UV) or electron beam (EB) is used. Electromagnetic waves such as γ rays, and charged particle beams such as α rays and ion rays can also be used.

The ionizing radiation curable resin can be appropriately selected from conventionally used polymerizable monomers and polymerizable oligomers or prepolymers.
As the polymerizable monomer, a (meth) acrylate monomer having a radical polymerizable unsaturated group in the molecule is suitable, and among them, a polyfunctional (meth) acrylate monomer is preferred.
The polyfunctional (meth) acrylate monomer may be a (meth) acrylate monomer having two or more ethylenically unsaturated bonds in the molecule, such as diethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, Preferable examples include trimethylolpropane tri (meth) acrylate, trimethylolpropane ethylene oxide tri (meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate and the like. It is done. These (meth) acrylate monomers may be used individually by 1 type, and may be used in combination of 2 or more type.

  The number of functional groups of the polyfunctional (meth) acrylate monomer is preferably 2 or more, and from the viewpoint of obtaining excellent surface protection properties, 2 to 8 is preferable, and 3 to 6 is more preferable.

Next, as the polymerizable oligomer, an oligomer having a radical polymerizable unsaturated group in the molecule, for example, a urethane (meth) acrylate oligomer, an epoxy (meth) acrylate oligomer, a polyester (meth) acrylate oligomer, a polyether (meth) acrylate. Preferred are (meth) acrylate oligomers such as oligomers and acrylic (meth) acrylate oligomers, and these oligomers can be used alone or in combination of two or more.
Of the above polymerizable (meth) acrylate oligomers, polyfunctional urethane (meth) acrylate oligomers are preferred. This is because the polyfunctional urethane (meth) acrylate oligomer can impart excellent surface protection properties and can suppress shrinkage of the decorative sheet during the production process.
The number of functional groups of the polyfunctional (meth) acrylate oligomer is not particularly limited as long as it is 2 or more, but 2 to 8 is preferable and 2 to 6 is more preferable from the viewpoint of surface protection characteristics and suppression of shrinkage during production.

  The weight average molecular weight (polystyrene equivalent weight average molecular weight measured by GPC method) of the polyfunctional (meth) acrylate oligomer is preferably 1,000 to 20,000, and preferably 1,000 to 10,000. It is more preferable.

As the ionizing radiation curable resin, a monofunctional (meth) acrylate may be used in order to adjust the hardness and the viscosity of the ionizing radiation curable resin composition.
Examples of the monofunctional (meth) acrylate include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, and cyclohexyl (meth) ) Acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, isobornyl (meth) acrylate, and the like. These monofunctional (meth) acrylates may be used alone or in combination of two or more.

When an ultraviolet curable resin is used as the ionizing radiation curable resin, it is desirable to add about 0.1 to 5 parts by mass of a photopolymerization initiator with respect to 100 parts by mass of the ultraviolet curable resin. The initiator for photopolymerization can be appropriately selected from those conventionally used, and is not particularly limited. For example, the initiator for photopolymerization such as benzoin, acetophenone, phenylketone, benzophenone, and anthraquinone An agent is preferably mentioned.
Moreover, as a photosensitizer, p-dimethylbenzoic acid ester, tertiary amines, a thiol type sensitizer, etc. can be used, for example.

  The ionizing radiation curable resin is preferably electron beam curable. In the case of electron beam curable, solvent-free is possible, which is more preferable from the viewpoint of environment and health, and does not require a photopolymerization initiator, and stable curing characteristics can be obtained.

  Any particles can be used as long as the particles can have surface irregularities. Examples of the organic particles include particles composed of polymethyl methacrylate, polyacryl-styrene copolymer, melamine resin, polycarbonate, polystyrene, polyvinyl chloride, benzoguanamine-melamine-formaldehyde condensate, silicone, fluorine resin, polyester resin, and the like. Can be mentioned. Examples of the inorganic particles include particles made of silica, alumina, zirconia, titania and the like. Among these particles, inorganic particles are preferable from the viewpoint that an excellent low gloss feeling is obtained, they can be easily procured and are inexpensive, and silica is preferable among the inorganic particles.

  The content of the particles in the surface protective layer is preferably 0.1 to 50% by mass, and 3 to 40% by mass in the total solid content forming the layer, from the viewpoint of satisfying the above-described conditions. It is more preferable, and it is still more preferable that it is 5-30 mass%.

  The average particle size of the particles in the surface protective layer is preferably from 1 to 60 μm, more preferably from 1 to 40 μm, from the viewpoint of satisfying the above-mentioned conditions and from the viewpoint of reducing the gloss of the portion other than the concave portion of the decorative sheet. More preferably, it is 30 μm.

In the present invention, the average particle diameter of the particles can be calculated by calculating the particle diameter of individual particles (aggregated particles in the case of aggregation) from the average of the major axis and minor axis of the particles, and averaging these. Specifically, two arbitrary particles are extracted from the surface image or cross-sectional image of the decorative sheet by SEM, TEM, or STEM. (In the case of a surface image, two particles can be selected randomly. Since it is unknown where it is cut, select two particles that are as large as possible), measure the long and short diameters of each particle, calculate the particle diameter of each particle, and display another screen of the same sample The same operation was performed 9 times in the above imaging, and the value obtained from the number average of the particle diameters of a total of 20 particles was defined as the average particle diameter of the particles. The major axis is the longest diameter on the particle screen. The minor axis is a distance between two points where a line segment perpendicular to the midpoint of the line segment constituting the major axis is drawn and the perpendicular line segment intersects the particle.
When calculating the average particle diameter of the particles, it is preferable to use SEM when the average particle diameter to be calculated is on the order of μm, and it is preferable to use TEM or STEM on the order of nm. In the case of SEM, the acceleration voltage is preferably 1 to 10 kV and the magnification is preferably 1000 to 7000 times. In the case of TEM or STEM, the acceleration voltage is preferably 10 to 30 kV and the magnification is preferably 50,000 to 300,000 times.

The design layer design layer is provided as necessary for the purpose of enhancing the design properties of the decorative sheet. The design layer is provided, for example, between the base material and the surface protective layer.
Examples of the design layer include a colored layer and a pattern layer. These layers may be used in appropriate combination by stacking the same kind or different kinds of layers.

The colored layer is a solid layer on the entire surface, and has a purpose of mainly providing concealability. The colored layer can be formed by printing or the like.
As the ink used for forming the colored layer, an ink obtained by appropriately mixing a binder, a colorant such as a pigment or a dye, an extender pigment, a solvent, a stabilizer, a plasticizer, a catalyst, or a curing agent is used.
The binder is not particularly limited. For example, acrylic resin, styrene resin, polyester resin, urethane resin, chlorinated polyolefin resin, vinyl chloride-vinyl acetate copolymer resin, polyvinyl butyral resin, alkyd resin, Examples include petroleum resins, ketone resins, epoxy resins, melamine resins, fluorine resins, silicone resins, fiber derivatives, rubber resins, and the like. These resins can be used alone or in admixture of two or more.
The colorant may be appropriately selected from the use of the decorative sheet and the color compatibility with the pattern layer. For example, carbon black (black), iron black, titanium white, antimony white, yellow lead, titanium yellow, and petal , Inorganic pigments such as cadmium red, ultramarine, and cobalt blue, organic pigments or dyes such as quinacridone red, isoindolinone yellow, and phthalocyanine blue, metal pigments made of scaly foil pieces such as aluminum and brass, titanium dioxide-coated mica, base And nacreous (pearl) pigments composed of scaly foil pieces such as conductive lead carbonate.

  The pattern layer is formed by printing or the like. Pattern patterns (pattern patterns) include wood grain patterns, marble patterns (for example, travertine marble patterns), stone patterns that simulate the surface of rocks, fabric patterns that simulate cloth and cloth-like patterns, tiled patterns, There are brickwork patterns, etc., and there are also patterns such as marquetry and patchwork that combine these. In the present invention, a wood grain pattern is preferable from the viewpoint of a synergistic effect with the effect of the uneven surface. These patterns are formed by multicolor printing with the usual yellow, red, blue and black process colors, as well as by multicolor printing with special colors prepared by preparing the individual color plates that make up the pattern. Is done. As the ink using the pattern layer, the same ink as the colored layer can be used.

  The thickness of the design layer can be appropriately adjusted within a range of about 0.1 to 20 μm in consideration of the form of the design layer and the target design properties. The design layer may contain additives such as an antioxidant and an ultraviolet absorber as long as the effects of the present invention are not impaired.

Thermoplastic resin layer thermoplastic resin layer, for protection of the substrate and decorative layer, if necessary, is provided between the substrate and the surface protective layer or between the design layer and the surface protective layer.
Various thermoplastic resins can be used as the thermoplastic resin forming the thermoplastic resin layer, and polyolefin resins are preferable.
As polyolefin resin, polyolefin resin illustrated as a material which comprises a base material can be employ | adopted preferably. Of these polyolefin resins, polypropylene resins are preferable, and random polypropylene resins are more preferable.

The thermoplastic resin layer may be constituted by a thermoplastic resin composition containing a colorant, if necessary, and may be translucent as long as the visibility of the design layer is ensured. Moreover, the thermoplastic resin composition may contain other additives such as fillers, flame retardants, antioxidants, lubricants, foaming agents, ultraviolet absorbers, light stabilizers, and the like as necessary. .
The thickness of the thermoplastic resin layer is preferably 5 to 200 μm, more preferably 10 to 150 μm, and more preferably 10 to 100 μm from the viewpoints of protection of the base material and design layer, mechanical strength, handleability, and the like. More preferably.

Adhesive layer Adhesive layer is provided between the base material and the thermoplastic resin layer or between the design layer and the thermoplastic resin layer as necessary in order to improve the adhesion of the thermoplastic resin layer. It is done.
The adhesive used in the adhesive layer can be appropriately selected according to the materials constituting the base material, the design layer, and the thermoplastic resin layer. For example, α-polyolefin resin such as polyethylene and polypropylene elastomer, polyester resin, A urethane resin, an epoxy resin, etc. are mentioned. Among these, polyester resins are preferable from the viewpoint of adhesion and heat resistance, and among these, two-component curable polyurethane resins are preferable.
Although the thickness of an adhesive bond layer changes with kinds etc. of the adhesive agent to be used, it is usually preferable to set it as about 0.1-30 micrometers, and it is more preferable to set it as 1-15 micrometers.

Primer layer The primer layer is provided between the thermoplastic resin layer and the surface protective layer, or between the substrate and the surface protective layer, if necessary, in order to improve the adhesion of the surface protective layer.
The primer layer is preferably composed mainly of a resin. Examples of the resin for the primer layer include ester resins, urethane resins, acrylic resins, polycarbonate resins, vinyl chloride-vinyl acetate copolymers, and the like. The resin of the primer layer may be a two-component curable resin. Of these resins, a two-component curable resin is preferable from the viewpoint of adhesion.
The two-component curable resin is not particularly limited as long as it is a resin that is cured by adding a curing agent to the main component, and the two-component curable resin in which the main component is a polyol (polyhydric alcohol) and the curing agent is an isocyanate curing agent. A urethane resin is preferred.

The primer layer may contain a weather resistance improver such as an ultraviolet absorber and a light stabilizer, an extender pigment, a solvent, a stabilizer, a plasticizer, a catalyst, and a curing agent.
The thickness of a primer layer is about 0.5-20 micrometers normally, and 1-10 micrometers is preferable.

Back surface primer layer The back surface primer layer is a layer preferably provided for the purpose of improving the adhesion between the base material and various adherends, and is provided on the surface of the decorative sheet opposite to the surface having the recesses.
The material used for forming the back primer layer is not particularly limited, and examples thereof include urethane resin, acrylic resin, polyester resin, vinyl chloride / vinyl acetate copolymer, chlorinated polypropylene resin, and chlorinated polyethylene resin. What is necessary is just to select suitably according to the material of a material.
Moreover, it is preferable that the thickness of a back surface primer layer is 1-5 micrometers, and it is more preferable that it is 1-3 micrometers.

Measuring method of height data The height data of the bottom of the concave portion and the height data of portions other than the concave portion on the surface of the decorative sheet can be measured by, for example, a three-dimensional shape analyzer.
The three-dimensional surface shape analyzer has a sensor portion that measures the height direction (depth) of an object using a laser or white light, and a stage portion that moves the object in the horizontal direction.

When a measurement sheet is set after setting a decorative sheet to be measured on the stage portion of the three-dimensional surface shape analyzer, the three-dimensional surface shape analyzer outputs measurement data as a measurement result. The measurement data has a format in which height data (depth) for each position specified by the x coordinate and the y coordinate is recorded. Height data (depth) is measured with an accuracy of 0.01 μm.
If height data is obtained as measurement data as a result of the analysis of the surface shape, the height data is corrected using a height data processing device. Here, a functional block diagram of the height data processing apparatus is shown in FIG.

  The height data input means has a function of inputting height data (depth) obtained by the surface shape analyzer, and is realized by an input device adapted to the height data format. For example, when the height data is recorded in FD or MO, it is realized by a corresponding reading device. Alternatively, the surface shape analysis device and the height data processing device may be connected via a communication line, and the height data may be input via the communication line.

  The high-pass processing means has a function of removing low frequency components of height data and extracting only high frequency components in order to remove uneven thickness and deflection existing in the decorative sheet. In the present embodiment, only the low frequency component is extracted from the height data, and only the high frequency component is extracted by subtracting the extracted low frequency component from the original height data.

  The line stripe removing unit has a function of removing line stripes that are line-like stripes generated on the height data from which only the high-frequency components are extracted. It is considered that this line stripe is caused by the fact that the stage portion moves up and down when the surface shape is moved in the horizontal direction in the surface shape analysis apparatus, and a difference in height occurs in the object.

  The specific processing of the height data processing apparatus will be described. When height data is input from the height data input means, the high-pass processing means extracts only the low frequency component from the height data. As a technique for extracting such low-frequency components, a known technique is adopted as disclosed in "Visual Information Processing-CG / Introduction to Image Processing-P66-67 (issued by CG-ARTS Association)". Can do. A smoothing filter having a predetermined size is used for extracting the low frequency component. The smoothing filter is for smoothing the value of each coordinate using a neighboring value, and its size is defined by the number of coordinates as a base for obtaining an average value. In this embodiment, a 3 × 3 smoothing filter is used, and smoothing is performed by giving an average value of a total of nine coordinate values of an original value of the coordinate and a value of eight neighboring coordinates as a value of a certain coordinate. . By executing this smoothing process on each coordinate on the measurement data, low frequency component data can be obtained. Note that the size of the smoothing filter can be set arbitrarily. The larger the filter size, the lower the frequency components are extracted.

  Subsequently, the high pass processing means executes a process of subtracting the extracted low frequency component data from the original height data. Since the sizes of the low frequency component data and the original height data are the same, the value of the low frequency component data is subtracted from the value of the height data for each corresponding coordinate. Since only the low frequency component is removed from the original height data, as a result, the high frequency component data in which only the high frequency component remains is obtained as corrected height data.

  Next, for each line of the height data, the line fringe removing unit calculates an average value of each coordinate value in the line and performs a process of subtracting the average value from each coordinate value of the line. In the present embodiment, height data is obtained by specifying coordinates with the main scanning direction of the surface shape analyzer, that is, the line direction as x, and the sub-scanning direction of the surface shape analyzer, that is, the direction in which the lines are arranged as y. . For this reason, the line fringe removing unit calculates the average value of the measurement data of each line in the measurement data, and performs a process of subtracting the average value of the line from each measurement data on the line. Thereby, even if the value of a certain line is small or large as a whole, it can be removed, and as a result, generation of line stripes can be prevented.

[Cosmetic materials]
The decorative material of the present invention is formed by laminating an adherend and a surface opposite to the uneven surface of the decorative sheet of the present invention described above, and integrating them.
Adhering materials are, for example, wood veneer, wood plywood, particle board, MDF (medium density fiber board), etc .; gypsum board such as gypsum board, gypsum slag board; calcium silicate board, asbestos slate board, lightweight foam Cement boards such as concrete boards and hollow extruded cement boards; fiber cement boards such as pulp cement boards, asbestos cement boards, wood chip cement boards; ceramics boards such as ceramics, porcelain, earthenware, glass, glazing; iron plates, galvanized steel sheets, poly Metal plates such as steel plates coated with vinyl chloride sol, aluminum plates, copper plates; thermoplastic resin plates such as polyolefin resin plates, acrylic resin plates, ABS plates, polycarbonate plates; phenol resin plates, urea resin plates, unsaturated polyester resin plates, polyurethane resins Thermosetting resin plates such as plates, epoxy resin plates, melamine resin plates; phenol resins, urea resins, unsaturated polyester Examples include so-called FRP plates in which glass fiber nonwoven fabrics, fabrics, papers, and other various fibrous base materials are impregnated and cured with resins such as copper resin, polyurethane resin, epoxy resin, melamine resin, and diallyl phthalate resin. These may be used alone, or may be used as a composite substrate in which two or more of these are laminated.

  The method of laminating the decorative sheet on the various adherends is not particularly limited, and for example, a method of sticking the sheet to the adherend with an adhesive or the like can be employed. What is necessary is just to select an adhesive agent suitably from well-known adhesive agents according to the kind etc. of to-be-adhered material. Examples include polyvinyl acetate, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ionomer, butadiene-acrylonitrile rubber, neoprene rubber, natural rubber, and the like.

  For example, decorative materials are preferably used as interior materials for buildings such as walls, ceilings and floors; fittings such as window frames, doors and handrails; furniture; housings for home appliances and OA equipment; exterior materials such as entrance doors. be able to. Among them, it is preferable to use it as an interior material for buildings, and it is preferable to use it for floors.

  EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by this example. “Part” is based on mass unless otherwise specified.

1. Measurement and Evaluation The following measurements and evaluations were performed on the decorative sheets prepared in Examples and Comparative Examples. The results are shown in Table 1.
(1) Measurement of height data of recess and calculation of surface properties About 20 recesses, Ra _{DEP of} each recess, average inclination angle θa _DEP , according to the procedure of (A) to (C) of the specification text, The surface properties such as RSm _DEP and Rzjis _DEP were calculated, and the average value of 20 locations was defined as the surface property calculated from the height data of the concave-convex shape of the sectional curve.
The height data of the cross-sectional curve of the concave-convex shape of the concave portion was measured using a three-dimensional shape analyzer equipped with a high-pass processing means and a line fringe removing means described in the specification text. The three-dimensional shape analyzer used the product name “LK-G30” manufactured by Keyence Corporation as the sensor part, and the product name “K2-300” manufactured by Kozu Seiki Co., Ltd. as the stage part. The measurement direction was a direction parallel to the arrangement direction of the grain conduit pattern, the height data measurement interval was 10 μm, and the measurement length was 1 mm.
Ra _DEP , RSm _DEP , and Rzjis _DEP were calculated by applying height data to the formula of JIS B0601: 2001. The average inclination angle is calculated by calculating the inclination angle of each measurement section from the interval (10 μm) of each measurement section of the height data and the altitude difference of each measurement section. Calculated on average.

(2) Measurement of height data of portions other than the recesses on the decorative sheet surface and calculation of surface properties High-pass processing means described in the text of the cross-section curve height data of the portions other than the recesses on the decorative sheet surface , And a three-dimensional shape analyzer equipped with means for removing line stripes. The measurement direction was parallel to the measurement direction of (1), the measurement interval of height data was 10 μm, and the measurement length was 1 mm. Surface properties such as 20 locations of Ra _SUR , average inclination angle θa _SUR , RSm _SUR , Rzjis _SUR, etc. are calculated, and the average value of 20 locations is defined as the surface properties calculated from the height data of the cross-sectional curves at locations other than the recesses. .

(3) Appearance of recess (gloss, sinking of recess)
The decorative sheet was placed on a horizontal base so that the uneven surface faces upward, and the uneven surface of the decorative sheet was irradiated with a fluorescent lamp from an angle of 15 to 35 degrees. From the position in the specular reflection direction of the light from the fluorescent lamp, the gloss of the concave portion, the ease of distinguishing the portion other than the concave portion and the concave portion, and the degree of depression of the concave portion were observed. The results are shown in Table 1.

2. Preparation of decorative sheet [Example 1]
A colored polypropylene sheet (thickness: 60 μm, random polypropylene resin) is prepared as a base material, and a reverse primer layer (thickness) is formed on one surface of the sheet by a gravure coating method using a primer agent (acrylic urethane resin). : 2 μm). Next, a pattern layer with a grain pattern (thickness: 3 μm) and an adhesive layer (polyester resin, thickness: 5 μm) are sequentially formed on the surface opposite to the surface provided with the back primer layer by gravure coating. did. Next, a thermoplastic resin layer (transparent polypropylene resin sheet, thickness: 80 μm) was laminated on the adhesive layer by extrusion lamination.
Next, after the corona discharge treatment is applied to the surface of the transparent polyolefin resin sheet, a two-component curable urethane resin composition is applied to form a primer layer (thickness: 2 μm), a back primer layer, a colored polypropylene sheet, A laminate A having a pattern layer, an adhesive layer, and a transparent polypropylene resin sheet / primer layer in this order was obtained.

Next, on the primer layer of the laminate A, a surface protective layer coating solution 1 having the following formulation was applied by a gravure direct coating method, and using an electron beam irradiation apparatus, oxygen concentration: 200 ppm, acceleration voltage: 175 keV, irradiation amount: The surface protection layer (thickness: 5 μm) was formed by curing the uncured resin layer of the ionizing radiation curable resin composition by irradiation with an electron beam under the condition of 5 Mrad. Next, embossing was performed using the following embossed plate 1 having a fine uneven pattern on the wood grain conduit pattern (sheet temperature: 120 to 160 ° C., pressure: 10 to 40 kg / cm ² ) to obtain a decorative sheet.
Note that the embossed wood grain conduit patterns used in the examples and comparative examples are arranged in parallel.

<Surface protective layer coating solution 1>
-65 parts bifunctional ester urethane acrylate oligomer (weight average molecular weight: 1300)
・ 35 parts of hexafunctional aliphatic urethane acrylate oligomer (weight average molecular weight: 1500)
・ 10 parts of inorganic particles (untreated silica, average particle size: 3.5 μm, pore volume: 5 ml / g or more)

<Embossed version 1>
(Wood grain pattern)
Width average: 0.45 mm, Length average: 4 mm, Pitch average: 1 mm, Maximum depth average: 70 μm
(Fine uneven pattern)
Pattern shape: oblique line, average height: 20 μm, average width (line width): 90 μm, average pitch: 100 μm

[Example 2]
A decorative sheet was obtained in the same manner as in Example 1 except that the embossed plate was changed to the following embossed plate 2.
<Embossed version 2>
(Wood grain pattern: same as embossed version 1)
(Fine uneven pattern)
Pattern shape: crosshair, average height: 25 μm, width (line width) average: 130 μm, pitch average: 140 μm

[Example 3]
A decorative sheet was obtained in the same manner as in Example 1 except that the embossed plate was changed to the following embossed plate 3.
<Embossed version 3>
(Wood grain pattern: same as embossed version 1)
(Fine uneven pattern)
Pattern shape: hemisphere, average height: 30 μm, average width (diameter at the bottom of the hemisphere): 110 μm, average pitch: 120 μm

[Comparative Example 1]
A decorative sheet was obtained in the same manner as in Example 1 except that the embossed plate was changed to the embossed plate 4 (one obtained by removing the fine uneven pattern from the embossed plate 1).

As shown in Table 1, the decorative sheets of Examples 1 to 3 can make the reflected light at the bottom of the concave portions inconspicuous, can distinguish between the concave portions and the portions other than the concave portions on the surface of the decorative sheet, and have extremely good design properties. It was a thing. Furthermore, the decorative sheets of Examples 1 to 3 were able to be recognized as the depressions were depressed, and the design properties were extremely good.
On the other hand, the decorative sheet of Comparative Example 1 was uncomfortable because the reflection intensity in the regular reflection direction was too strong. In addition, the decorative sheet embossed using an embossed plate whose surface has been sandblasted completely loses the glossiness of the recesses, making it difficult to distinguish between the recesses and the portions other than the recesses, and the recesses sink. It was invisible.

  The decorative sheet of the present invention is useful in that the reflected light at the bottom of the concave portion of the decorative sheet can be made inconspicuous, the concave portion on the surface of the decorative sheet and the portion other than the concave portion can be distinguished, and the design can be made extremely good. It is.

1: Base material 2: Design layer 3: Adhesive layer 4: Thermoplastic resin layer 5: Surface protective layer 6: Recess 10: Cosmetic sheet

Claims (16)

A decorative sheet having a plurality of recesses on at least one surface, wherein at least a part of the recesses has an uneven shape at the bottom,
About the arithmetic mean roughness Ra _DEP calculated according to the calculation formula of JIS B0601: 2001 from the height data of the cross-sectional curve in any direction of the concave-convex shape of the concave portion, and the portions other than the concave portion on the surface of the decorative sheet, A decorative sheet in which the arithmetic average roughness Ra _SUR calculated according to the calculation formula of JIS B0601: 2001 from the height data of the cross-sectional curve in a direction parallel to the arbitrary direction satisfies the following condition (1).
0.60 ≦ Ra _DEP / Ra _SUR ≦ 0.96 (1) The decorative sheet according to claim 1, wherein the Ra _DEP satisfies the following condition (1 ').
3.5 μm ≦ Ra _DEP ≦ 10.0 μm (1 ′) The average inclination angle θa _DEP calculated from the height data of the cross-sectional curve in an arbitrary direction of the concave-convex shape of the concave portion, and the cross-sectional curve in a direction parallel to the arbitrary direction for a portion other than the concave portion on the surface of the decorative sheet The decorative sheet according to claim 1 or 2, wherein the average inclination angle θa _SUR calculated from the height data satisfies the following condition (2).
θa _DEP / θa _SUR ≦ 0.80 (2) The decorative sheet according to claim 3, wherein the θa _DEP satisfies the following condition (2 ').
17.0 degrees ≦ θa _DEP ≦ 27.0 degrees (2 ′) The average length RSm _DEP of the roughness curve element calculated according to the calculation formula of JIS B0601: 2001 from the height data of the cross-sectional curve in any direction of the concave-convex shape of the concave portion, and other than the concave portion on the surface of the decorative sheet The average length RSm _SUR of the roughness curve element calculated according to the calculation formula of JIS B0601: 2001 from the height data of the cross-sectional curve in the direction parallel to the arbitrary direction is the following condition (3): The decorative sheet according to any one of claims 1 to 4, which is satisfied.
1.20 ≦ RSm _DEP / RSm _SUR (3) The decorative sheet according to claim 5, wherein the RSm _DEP satisfies the following condition (3 ').
80.0μm ≦ RSm _DEP (3 ')   The decorative sheet according to any one of claims 1 to 6, wherein the concave portion has a minor axis and a major axis, and a direction parallel to the major axis is the arbitrary direction.   The decorative sheet according to claim 7, wherein the average length of the major axis of the recess is 2 to 50 mm.   The decorative sheet according to claim 7 or 8, wherein an average length of the minor axis of the recess is 0.1 to 10 mm.   The decorative sheet according to any one of claims 7 to 9, wherein the plurality of recesses are arranged so that their major axes are substantially parallel to each other.   The average of the maximum depth of the said recessed part is 40-200 micrometers, The decorative sheet of any one of Claims 1-10.   The decorative sheet according to any one of claims 1 to 11, comprising a surface protective layer on a substrate and having the concave portion on a surface on the surface protective layer side.   The decorative sheet according to claim 12, comprising a design layer between the base material and the surface protective layer.   The decorative sheet according to claim 13, wherein the design layer includes a wood grain pattern.   A decorative material obtained by laminating and integrating an adherend and a surface of the decorative sheet according to any one of claims 1 to 14 opposite to the surface having the concave portion.   The decorative material according to claim 15, which is used as a decorative material for a floor.

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