JP2017156639A - Embossment sheet and decorative sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an embossment sheet which expresses a glossy feeling which appears on a wood grain pattern of a natural tree, and a decorative sheet having the embossment sheet, and reflecting the glossy feeling of a wood.SOLUTION: An embossment sheet has a substrate on which plural lenses are formed. A cross sectional shape in a first direction of one group of lenses out of plural lenses comprises, a reflection main part and a connection part, and a cross sectional shape in a second direction orthogonal to the first direction of other one group of lenses comprises, a reflection main part and a connection part, the one group of lenses and other one group of lenses comprise a tangential angle of the reflection main part which is 15° or less, a tangential angle of the connection part is 0° or more and 25° or less on one end side of the reflection main part, and 25° or more and 40° or less on the other end side. At least some of the one group of lenses comprise, a same tangential angle of the reflection main angle, and arranged adjacently in the first direction, at least some of other one group of lenses comprise a same tangent angle of the reflection main part and arranged adjacently in the second direction.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an embossed sheet that controls illumination reflected light, and a decorative sheet including the embossed sheet.

  Conventionally, as a decorative plate used as a surface material for interior and furniture, a veneer decorative plate in which a single wood plate is bonded to the surface of a base material has been widely used. However, in recent years, due to the depletion of natural materials, a decorative board in which a decorative sheet printed with a wood grain pattern is bonded to a base material such as plywood is often used.

  However, printed decorative sheets are poor in expressing the texture of wood (shininess, conduit shape, etc.). Therefore, in Patent Document 1, a decorative sheet made of a transparent polyolefin resin having a hardwood wood grain pattern printed on the back surface is laminated on a thin and flat wood substrate made of relatively easy-to-obtain softwood material. Has been considered a method of making a decorative material excellent in design that reflects the so-called shimmering feeling and wood texture.

Japanese Patent No. 5003086

  The “shininess” that appears in the wood grain pattern of natural wood is a glossiness that appears in a direction different from the regular reflection direction of the illumination light, and the location where the “shine” occurs when the illumination angle or observation angle moves. The movement of “shine” is directional, and this is thought to be due to the cellular lumen of natural wood being fibrous. In other words, the illumination light incident in the direction of the fiber in the cell lumen is reflected in the specular reflection direction, but the illumination light incident in the direction of the fiber arrangement in the cell lumen is specularly reflected depending on the angle of the cell lumen. Is deflected in a different direction. It is considered that the movement of “shine” occurs when the angle of the cell lumen changes depending on the position.

  An object of the present invention is to provide an embossed sheet that expresses the “shine feeling” that appears in the wood grain pattern of natural wood, and a decorative sheet that includes this embossed sheet and further reflects the feeling of luster of wood. .

  One aspect of the present invention for solving the above problems includes a light-transmitting base material having a plurality of lenses formed on one surface, and each of the group of lenses includes a predetermined first number. The cross-sectional shape in the direction of 1 has a reflection main part, and each connection part which connects each edge part of a reflection main part, and a base-material surface, and does not contain a group of lenses among several lenses The group of lenses each have a cross-sectional shape in a second direction orthogonal to the first direction, a reflection main portion, and a connection portion that connects each end of the reflection main portion and the substrate surface, respectively. In the one group of lenses and the other group of lenses, the reflection main part is linear or curved, the tangent angle with respect to the base material surface is 15 ° or less, and the connection part has the base material surface as a reference. The tangent angle is 0 ° or more and 25 ° or less on one end side of the reflection main portion, and the other end And at least some of the lenses constituting the group of lenses have the same tangent angle and are arranged adjacent to each other in the first direction. Is the embossed sheet that is at least 100 μm or more, and at least some of the lenses constituting the other group of lenses are: The reflection main parts have the same tangent angle and are arranged adjacent to each other in the second direction, and the length of the reflection main part in the second direction or the sum of the lengths of the connection parts in the second direction is: It is at least 100 μm or more.

  Another aspect of the present invention is that the lens constituting the group of lenses has a length in the first direction of 50 μm or more and 400 μm or less and a length in the second direction orthogonal to the first direction of 25 μm. The height difference from the surface of the base material of the lens may be 15 μm or more and 30 μm or less. The lenses constituting the other group of lenses have a length in the second direction of 50 μm to 400 μm and a length in the first direction of 25 μm to 200 μm. May be 15 μm or more and 30 μm or less.

  According to another aspect of the present invention, the plurality of lenses described above may include two or more types of lenses having different tangent angles of the reflection main portion.

  In another aspect of the present invention, the plurality of lenses may be intermittently arranged in the first direction and the second direction.

  According to another aspect of the present invention, at least one of the plurality of lenses and the base material described above may be roughened, and the surface roughness Ra may be in the range of 0.01 μm to 5 μm.

  Another aspect of the present invention is a decorative sheet including the above-described embossed sheet.

  According to the present invention, it is possible to provide an embossed sheet that expresses the “shine feeling” that appears in the wood grain pattern of natural wood, and a decorative sheet that includes this embossed sheet and further reflects the feeling of luster of wood.

It is a figure explaining the lens of the embossed sheet which concerns on one Embodiment of this invention. It is a figure explaining the lens of the embossed sheet which concerns on one Embodiment of this invention. It is a figure explaining the lens of the embossed sheet which concerns on one Embodiment of this invention. It is a figure explaining arrangement | positioning of the lens of the embossing sheet which concerns on one Embodiment of this invention. It is a figure explaining arrangement | positioning of the lens of the embossing sheet which concerns on one Embodiment of this invention. It is a figure explaining arrangement | positioning of the lens of the embossing sheet which concerns on one Embodiment of this invention. It is a figure explaining arrangement | positioning of the lens of the embossing sheet which concerns on one Embodiment of this invention. It is a figure explaining the decorative sheet which concerns on one Embodiment of this invention. (A) Schematic diagram of wood pieces, (b), (c) Measurement results of reflection / scattering characteristics.

  FIG. 9 shows the result of the reflection / scattering characteristic evaluation of this “shine”. 9A is a schematic diagram of a measured piece of wood, FIG. 9B is a reflection / scattering characteristic when illumination light is incident from the Y direction, and FIG. 9C is a diagram illustrating illumination light from the X direction. This is a reflection / scattering characteristic when incident. As shown in FIG. 9B, when the illumination light is incident from the Y direction, the second reflection peak intensity is confirmed at an angle different from the regular reflection angle. When the measurement location is changed, the second reflection peak intensity is It was confirmed that the angle changed. On the other hand, when illumination light was incident from the X direction, the reflection peak intensity occurred only at the regular reflection angle. That is, anisotropy due to the above-described fibrous cell lumen was confirmed.

  An embossed sheet 1 according to an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a plan view of a lens 2 constituting the embossed sheet 1, a cross-sectional view of the lens 2 when the lens 2 is viewed from the first direction, and a cross-section of the lens 2 when the lens 2 is viewed from the second direction. FIG. The embossed sheet 1 includes a base material 3 having translucency and a plurality of lenses 2 protruding on one surface 31 of the base material 3.

  The cross section in one direction of the lens 2 (the first direction in FIG. 1) is a linear reflection main portion 21 and a curved line-like connection portion 22 that connects the reflection main portion 21 and one surface 31 of the substrate 3. , 23. On the other hand, the cross section in the second direction orthogonal to the first direction only has to protrude from the surface 31, and may be arcuate, trapezoidal, or triangular, and the shape is not limited. In FIG. 1, the lens 2 is expressed in a convex shape, but may be a concave shape.

  In FIG. 2, the detailed shape of the cross section in the 1st direction of the lens 2 is shown. The tangent angle θ1 formed between the reflection main portion 21 and the one surface 31 of the substrate 3 is appropriately determined within a range of ± 15 ° according to the desired grain pattern. The light incident on the embossed sheet 1 is reflected mainly by the one surface 31 of the substrate 3 and the reflection main portion 21 of the lens 2. Since the tangent angle θ1 formed between the reflection main portion 21 and one surface 31 of the base material 3 is arranged in a range of ± 15 ° (including 0 °), it is reflected by the one surface 31 of the base material 3. It is possible to generate reflected light (second reflection peak intensity) in a different direction with respect to the regular reflected light. When the tangent angle θ1 formed between the reflection main portion 21 and one surface 31 of the base 3 is 0 °, the connection portions 22 and 23 having curved surfaces at both ends of the reflection main portion 21 are essential.

  Moreover, the second reflection peak intensity can be adjusted by adjusting the area ratio of the lens 2 in the embossed sheet 1. The area ratio of the lens 2 can be set as appropriate, but is desirably in the range of 1% to 70%. By setting the range to 1% or more and 70% or less, it is possible to prevent a problem that the arrangement of the lenses 2 is sparse and the lenses 2 are easily visually recognized as individual dots. Moreover, it is possible to prevent a problem that the flat portion of the one surface 31 of the base material 3 is too few, and most of the reflected light from the embossed sheet 1 is caused by the lens 2 and it is not possible to express the feeling of shine. . The area ratio may be constant in one surface 31 of the base material 3, or the area ratio of the lens 2 may be varied (dense distribution) depending on the location. When it is desired to increase the second reflection peak intensity, the area ratio is increased. When it is desired to decrease the second reflection peak intensity, the area ratio is set low.

  That is, when it is desired to express the strength of the second reflection peak intensity within the surface of the embossed sheet 1, for example, an area where the second reflection peak intensity is desired to be weak is a range where the area ratio of the lens 2 is 1% or more and less than 20%. The region where it is desired to increase the reflection peak intensity can be set to 50% or more and 70% or less, and the middle thereof can be set to 20% or more and less than 50%. Here, the area ratio of the lens 2 is defined as the area of the reflection main portion 21 of the lens 2 per unit area of the one surface 31 of the embossed sheet 1. What is necessary is just to set suitably the location which fluctuates the area ratio of the lens 2 with respect to printing of a grain pattern.

  The cross section along the second direction of the reflection main portion 21 may be a straight line or a gentle curve, but if it is a straight line, the width of the second reflection peak becomes narrow. As shown in FIG. 9, since the second reflection peak has a certain angle range, it is desirable that the reflection main portion 21 is curved rather than a perfect straight line. The cross sections of the connecting portions 22 and 23 of the lens 2 may be linear, or as shown in FIG. 2, the connecting portion 22 is curved with a radius r2 smaller than the reflecting main portion 21 curved with a radius r1, and is curved with a radius r3. The connection unit 23 may be used.

  As a modification of the lens 2, as shown in FIG. 3, one end of the reflection main portion 21 is directly connected to one surface 31 of the base material 3. This is one in which one of the connecting portions 22 and 23 is omitted. Since the reflection main part 21 has a function of generating the second reflection peak, the connection parts 22 and 23 may be omitted as necessary. However, when the reflecting main portion 21 is a straight line and the angle formed between the reflecting main portion 21 and one surface 31 of the base material 3 is 0 °, the sum of the lengths of the connecting portions 22 and 23 at both ends is 100 μm or more. There must be. Alternatively, when lenses having the same tangent angle of the reflection main part are continuously arranged on the embossed sheet 1, the sum of the lengths of the connection parts 22 and 23 of the lenses having the same tangent angle of the reflection main part is obtained. What is necessary is just 100 micrometers or more. This makes it possible to express the “shine” that appears in natural wood.

  The tangent angle θ3 formed by the radius r3 of the curved portion of the base material 3 and the connection portion 23 is 25 ° or more and 40 ° or less, and the tangential angle θ2 formed by the radius r2 of the curved portion of the base material 3 and the connection portion 22 is 0 ° or more and 25. The radii r2 and r3 may be the same as long as they are within the range of 0 ° or less. When the tangent angle θ2 is 0 ° or more and 25 ° or less and the tangent angle θ3 is 25 ° or more and 40 ° or less, a part of the light incident on the substrate 3 and the embossed sheet 1 is reflected from the reflection main portion 21. The light enters the connection portions 22 and 23. Thus, the incident light can be scattered and reflected not only by the reflection main portion 21 but also by the connection portions 22 and 23. Furthermore, it is more desirable that the connecting portions 22 and 23 are curved rather than completely straight.

Next, the arrangement of the lenses 2 in the embossed sheet 1 will be described. In the arrangement of the two lens groups, it is preferable to have at least two kinds of reflection main portions 21 having different tangent angles. FIG. 4 is a diagram showing a part of the arrangement of the lens 2 in the embossed sheet 1, but the arrangement of the lens 2 is not limited to the following arrangement. The embossed sheet 1 is arranged as a lens 2 so that lenses 2a to 2e having different cross-sectional shapes are arranged in the second direction in the second direction, and lenses having the same shape are arranged in the first direction. Has been. In FIG. 4, another lens shape may be arranged on the left side of 2a or the right side of 2e. Furthermore, in FIG. 4, the cross-sectional shape in the 1st direction of the lenses 2a to 2e used for the embossed sheet 1 is shown. In the first direction, the angle between the reflecting main portion 21 and one surface 31 of the substrate 3 is θ1a, the lens 2b is θ1b, the lens 2c is θ1c, the lens 2d is θ1d, and the lens 2e is θ1e in the first direction. Arranged.
At this time, the angles θ1a to θ1e formed by the reflection main portion 21 of the lenses 2a to 2e and the one surface 31 of the substrate 3 were varied within a range of ± 15 ° or less.

  Such an angle θ1 may fluctuate periodically, such as −10 °, −5 °, 0 °, + 5 °, and + 10 °, for each shape type. Further, the step width of the angle θ1 may be a large step value such as 5 ° as described above, but may be a finer step value of 1 ° or less. The finer the step value, the smoother the movement of the light receiving angle of the second reflection peak intensity that occurs when the viewpoint or the illumination angle is changed. On the other hand, the larger the step, the easier the manufacturing process.

  While the lens group arrangement has at least two or more different tangent angles θ1, the first cross-sectional shape length (L in FIG. 1) of the lens 2 in each lens group is 50 μm or more and 400 μm or less. The second direction cross-sectional shape length (W in FIG. 1) is preferably 25 μm or more and 200 μm or less, and the height difference (H in FIG. 1) between the lens 2 and the substrate is preferably 15 μm or more and 30 μm or less. By satisfying the above range, the lens 2 having the second reflection peak intensity can be manufactured. Furthermore, when processed into a decorative sheet, it is possible to prevent the lens 2 from being visually recognized and recognized as a foreign object. In addition, by setting the height difference within the above-described range, it is possible to prevent the function of the lens 2 from being deteriorated and to detect the second reflection peak intensity. Furthermore, by satisfying the size of the lens described above, it is possible to arrange the lens 2 on the embossed sheet 1 by appropriately changing the area ratio of the lens 2 according to the desired wood grain pattern.

  When a plurality of lens groups having the characteristics shown in FIG. 4 are used as the lens group 2, the lens group 2 is arranged so as to be orthogonal to the second direction from the first direction as shown in FIG. It is also possible to select the lens group 32. By using the embossed sheet 1 as shown in FIG. 5, it is possible to impart a “shine” from the lateral direction (second direction) to the decorative sheet without tilting the decorative sheet printed with the wood grain pattern. Become. As a result, the direction of “shine” is not limited with respect to the wood grain pattern. The characteristics of the single lens of the lens group 32 are the same as the characteristics of the lens group 2, and the only difference is the direction of lens arrangement. That is, as shown in FIG. 4, when the major axis direction of the lens group 2 is the first direction, the major axis direction of the lens group 32 is the second direction as shown in FIG. Tilt arrangement. With this feature, it is possible to generate a second reflection peak that expresses “shine” in a specific direction with respect to a change in the viewing angle in the vertical direction and the change in the viewing angle in the horizontal direction.

  As shown in FIG. 6, the lens group 2 and the lens group 32 can be mixed and arranged on the embossed sheet 1. By mixing the lens group 2 and the lens group 32 on the embossed sheet 1, it is possible to generate the second reflection peak intensity expressing “shine” without being limited to a specific direction. It is possible to express a “shine feeling” that approximates The ratio of the lens group 32 is preferably in the range of 20% to 80% of the total number of lenses including the lens group 2. If the ratio of the lens group 32 is outside the above range, the desired “shininess” cannot be obtained. The arrangement of the lens shapes can be changed as appropriate for the wood grain pattern to be printed.

  As a method of scattering and reflecting the light incident on the embossed sheet 1, at least one of the one surface 31 of the substrate 3 and the lens 2 may be roughened. By roughening the mold for forming the embossed sheet 1, the roughened surface may be transferred to one surface 31 of the substrate 3, or the embossed sheet 1 may be directly roughened. Alternatively, a coating containing fine particles may be applied to one surface 31 of the substrate 3. At this time, the surface roughness Ra (based on arithmetic average roughness JIS B0601-2001) is preferably in the range of 0.01 μm to 5 μm. By setting the surface roughness Ra in the range of 0.01 μm or more and 5 μm or less, it is possible to maintain the function of the lens 2 and improve the scattering characteristics.

[Embossed sheet manufacturing method]
Next, a method for manufacturing the embossed sheet 1 will be described. The embossed sheet 1 can be formed integrally with the substrate 3 and the lens 2 by an extrusion method, an injection molding method, or a hot press molding method using a plate for forming the lens 2. Examples of the resin used include polyethylene terephthalate (PET), polyethylene-2,6-naphthalate, polypropylene terephthalate, polybutylene terephthalate, cyclohexanedimethanol copolymer polyester resin, isophthalic acid copolymer polyester resin, and sporoglycol copolymer polyester resin. , Polyester resins such as fluorene copolymer polyester resins, polyethylene resins, polypropylene (homopolymers, random copolymers, block copolymers), polyolefin resins such as polymethylpentene and alicyclic olefin copolymer resins, and acrylic resins such as polymethyl methacrylate , Polycarbonate, polystyrene, polyamide, polyether, polyesteramide, polyetherester, polyvinyl chloride, cycloolefin Inporima, polyacrylonitrile copolymers, acrylonitrile-styrene copolymer, and copolymers and these components, also can be used as mixtures of these resins are not particularly limited. For example, an ultraviolet absorber or a light stabilizer may be added. Alternatively, the substrate 3 is molded by the extrusion molding method or the injection molding method using the thermoplastic resin, and then the plate for forming the lens 2 is used for the hot pressing method, the ultraviolet curing molding method, the electron beam curing molding. The lens 2 may be formed by a method or the like.

  A plate used for forming the embossed sheet 1 can use, for example, a laser direct drawing, a processing method such as etching or a cutting tool. This time, the surface of the plate material was processed with a cutting tool. The plate has a desired tangential angle θ1 to θ3, the first direction sectional shape length is 50 μm or more and 400 μm or less, the second direction sectional shape length is 25 μm or more and 200 μm or less, and the height difference between the lens and the substrate is The cutting tool is moved so that the thickness becomes 25 μm. At this time, as the cross-sectional shape in the second direction, the tip shape of the diamond tip of the cutting tool is transferred as it is. It is necessary to perform processing using a cutting tool having a tip shape so as to obtain a desired lens shape.

  The lens group 32 is processed at a desired position so that the size of the single lens and the tangent angles θ1 to θ3 are the same as those of the lens group 2 and become 20% to 80% of the total number of lenses. I do.

  By disposing the embossed sheet 1 obtained in this manner on the printing surface 4 of the decorative sheet 5 with a wood grain pattern, it is possible to satisfactorily express “shine” close to an actual tree. In FIG. 8, sectional drawing of the decorative sheet 5 using the embossed sheet 1 is shown. The embossed sheet 1 may be provided with not only the lens 2 described above but also a concave portion or a convex portion (not shown) representing a conduit. This is because “shine” close to that of an actual tree can be expressed even better. An overcoat layer (not shown) may be provided on the surface of the embossed sheet 1.

  As described above, the shape of the single lens, the type of lens group, the surface roughness Ra, the concave portion or the convex portion expressing the conduit in the embossed sheet 1 are desired to be applied to the decorative sheet 5 with respect to the printing of the wood grain pattern. It will be decided as appropriate to give a “feel”.

  FIG. 7 shows an embossed sheet 31 which is an example in which the lens group 2 and the lens group 32 in the embossed sheet 1 are mixedly arranged. As shown in FIG. 7, the lenses constituting the lens group 2 and the lens group 32 are mixedly arranged on lattice points where virtual lines extending in the first direction and the second direction intersect. The lenses constituting the lens group 2 and the lens group 32 do not need to be arranged on all the lattice points, and may be provided with lattice points on which lenses are not arranged. As described above, the lenses are intermittently arranged in the first direction and the second direction, so that a portion having a strong “light feeling” and a portion having a low “light feeling” corresponding to a place where the area ratio of the lens is high and a place where the lens area is low are generated. Therefore, it is possible to express the shading of “shine”. In order to express “shiny feeling” close to an actual tree on the decorative sheet, it is preferable to randomly arrange lenses that give a shiny feeling to the pattern printed with a wood grain pattern like the decorative sheet 5 shown in FIG. The lens group 2 can give a “shine feeling” of wood to the decorative sheet in the first direction, and the lens group 32 can give a “shine feeling” of wood to the decorative sheet in the second direction.

  Thus, by mixing a certain amount of the lens group 32 with the lens group 2, there is a feature that does not limit the direction and area of “shine” with respect to the pattern printed with the wood grain pattern. That is, an embossed sheet consisting of only the lens group 2 or only the lens group 32 becomes an embossed sheet that can be applied only to a decorative sheet of a specific size, and a step of appropriately tilting the embossed sheet into a decorative sheet is required. . On the other hand, since the embossed sheet 3 in which the lens group 2 and the lens group 32 are mixed is not limited to the size of the decorative sheet 5 as described above, it can be said to be an embossed sheet having a high degree of freedom. The size of the decorative sheet applied to the actual building is a size of 1500 mm wide x 1800 mm long. To reproduce the “shine feeling” in synchronism with the grain pattern, the direction of the “shine feeling” An embossed sheet with a high degree of freedom in which the area is not limited is desired.

  Although the material of the base material 6 of the decorative sheet 5 is not particularly limited, the thermoplastic resin used for the embossed sheet 1 described above may be used. Examples of suitable materials include random PP (polypropylene) and HDPE (high density polyethylene), and organic and inorganic pigments may be added to these thermoplastic resins. As the ink used for the printing surface 4, for example, an urethane resin binder added with an organic or inorganic pigment is preferably used, but is not limited thereto. Further, an adhesive layer (not shown) may be added at the interface (printing surface 4) between the base material of the decorative sheet 5 and the embossed sheet 1. For example, a polypropylene-based adhesive resin is used as the adhesive layer, but the adhesive layer is not limited to this. It can be appropriately selected in consideration of the adhesion between the base material of the decorative sheet 5 and the embossed sheet 1. Further, an anchor layer in which an isocyanate system is mixed with polyester polyol may be added between the base material of the decorative sheet 5 and the adhesive layer. As the overcoat layer material on the surface of the embossed sheet 1, for example, a resin obtained by adding an ultraviolet absorber or a light stabilizer to a resin obtained by mixing an isocyanate with acrylic polyol can be used, but is not particularly limited.

  Since the decorative sheet 5 has the embossed sheet 1 having the regular reflection peak intensity and the second reflection peak intensity at an angle that varies depending on the location, the “shine” that occurs in the real wood grain is expressed, and more actual It is possible to obtain a woodgrain decorative sheet 5 that expresses a “shine” that is close to wood.

  In order to verify the effect of the present invention, an embossed sheet 1 and a decorative sheet 5 as shown below were produced. The lens 2 has five tangent angles θ1 formed between the central tangent of the reflecting main portion 21 and one surface 31 of the substrate 3 in 5 ° increments within a range of ± 10 ° including 0 °, and printed wood grain pattern On the other hand, each lens group 2 was arranged by appropriately changing in the first and second directions. The area ratio of the lens group 2 occupying an arbitrary region was fixed at 40%.

  In the above-mentioned lens group 2 consisting of 5 types in increments of 5 ° within a range of ± 10 ° including 0 °, the tangent angle θ3 is within 40 °, and the tangent angle θ2 is within 25 °. The tangential angles θ2 and θ3 were adjusted so that the first direction cross-sectional shape length was in the range of 50 μm to 400 μm.

  The plate was processed using a diamond tip having a cutting tool tip shape of an arc radius of 50 μm in the second direction cross-sectional shape of the single lens 2 in the embossed sheet 1. In this way, the second direction cross-sectional shape is an arc shape, and the lens has a length in the range of 25 μm to 200 μm. At this time, the lens 2 was processed to have a height difference of 25 μm.

  Next, with respect to the lens group 2, the lens group 32 was processed with the same single shape as the lens group 2, the same θ1 to θ3, the same area ratio, and the direction was inclined by 90 °. The arrangement of the lenses was appropriately changed with respect to the printed wood grain pattern. Further, in the lens group 2 and the lens group 32, the ratio of each of the five lens shapes in increments of 5 ° within a range of ± 10 ° including 0 ° is appropriately changed in accordance with the wood grain pattern to be printed.

After processing the mold for forming the embossed sheet 1 in this way, a sandblasting process is further performed, and the surface roughness Ra on the flat surface onto which one surface 31 of the base material 3 of the mold is transferred is The thickness was about 2 μm. In addition, a pattern for transferring a recess representing the conduit was also formed on the mold. This mold was called mold A.
[Comparative Example 1]

The flat mold was subjected to sand blasting so that the surface roughness Ra of the substrate was about 2 μm. Moreover, the metal mold | die B which formed the pattern which transcribe | transfers the recessed part expressing a conduit | pipe was prepared.
[Comparative Example 2]

  A mold C was prepared by the same manufacturing method as in Example 1 except that the mold consisted only of the lens group 2.

  The embossed sheet 1 was molded with a transparent resin and the molds A, B, and C on a sheet printed with a wood grain pattern, and a decorative sheet 5 having an embossed surface was obtained. The decorative sheet 5 according to the example showed a band-like bright line under illumination, and a visual expression in which the band-like bright line moved was obtained by changing the viewing angle of the observer in the vertical and horizontal directions and the angle of the decorative sheet 5. On the other hand, the decorative sheet 5 which is the comparative example 1 does not have the bright line as described above. Further, although the decorative sheet 5 which is the comparative example 2 obtained a visual expression in which the band-like bright line moves, the visual expression in which the horizontal bright line moves is not obtained with only a limited vertical direction. By comparing the three examples, it was possible to obtain the decorative sheet 5 of the example expressing the “shine feeling” closer to a real tree.

  As described above, according to the embossed sheet 1 of the present invention, a plurality of lenses 2 including the reflecting main portions 21 having different angles θ1 formed with the one surface 31 of the substrate 3 are arranged. In this direction, the reflected light can be emitted at an angle different from the regular reflection angle on the one surface 31 of the substrate 3, and the lens group 2 having at least two kinds of reflection main portions 21 having different angles. Therefore, the reflected light angle can be freely designed depending on the location. In other words, the embossed sheet 1 can express anisotropic scattering reflection characteristics having different reflection characteristics depending on the viewing angle described above. By providing the embossed sheet 1, it is possible to impart a “shiny feeling” of wood to the decorative sheet 5. it can. In addition, the lens groups 32 tilted by ± 90 ° are mixed at an arbitrary ratio with respect to these lens groups 2 and are appropriately arranged, so that the “shiny feeling” of the tree on the decorative sheet is vertically and against the wood grain pattern. It can also be given in the horizontal direction. This makes it possible to obtain a decorative sheet that is not limited by the size of the decorative sheet 5 and that expresses a “shine” that is closer to a real tree.

  INDUSTRIAL APPLICABILITY The present invention is useful for a decorative sheet that is used by being attached to a wood-grained decorative board.

1 Embossed sheet 2, 32 Lens (group)
21 reflection main part 22 connection part 23 connection part 3 base material (embossed sheet)
31 One side of base material 4 Printing surface 5 Cosmetic sheet 6 Base material (decorative sheet)

Claims (7)

A substrate having translucency in which a plurality of lenses are formed on one surface,
A group of lenses of the plurality of lenses is
Each has a cross-sectional shape in a predetermined first direction,
A reflection main part, and a connection part for connecting each end of the reflection main part and the substrate surface,
The other group of lenses not including the group of lenses among the plurality of lenses,
Each of the cross-sectional shapes in a second direction orthogonal to the first direction is
A reflection main part, and a connection part for connecting each end of the reflection main part and the substrate surface,
The group of lenses and the other group of lenses are:
The reflection main part is a straight line or a curved shape, and a tangential angle with respect to the base material surface is 15 ° or less,
The tangential angle of the connection portion with respect to the surface of the base material is 0 ° or more and 25 ° or less on one end side of the reflection main portion and 25 ° or more and 40 ° or less on the other end side.
At least some of the lenses constituting the group of lenses are:
The reflection main parts have the same tangent angle and are arranged adjacent to each other in the first direction, and the length of the reflection main part in the first direction or the sum of the lengths of the connection parts in the first direction Is at least 100 μm or more,
At least some of the lenses constituting the other group of lenses are:
The reflection main portions have the same tangential angle and are arranged adjacent to each other in the second direction, and the length of the reflection main portion in the second direction or the length of the connection portion in the second direction is An embossed sheet having a sum of at least 100 μm. The lenses constituting the group of lenses are:
The length in the first direction is 50 μm or more and 400 μm or less,
2. The embossed sheet according to claim 1, wherein a length in a second direction orthogonal to the first direction is 25 μm or more and 200 μm or less, and a height difference of the lens from the substrate surface is 15 μm or more and 30 μm or less. The lenses constituting the other group of lenses are:
The length in the second direction is 50 μm or more and 400 μm or less,
The length in the first direction is 25 μm or more and 200 μm or less,
The embossed sheet according to claim 1 or 2, wherein a height difference of the lens from the substrate surface is 15 µm or more and 30 µm or less.   The embossed sheet according to any one of claims 1 to 3, wherein the plurality of lenses include two or more types of the lenses having different tangent angles of the reflection main portion. The plurality of lenses are:
The embossed sheet according to any one of claims 1 to 4, wherein the embossed sheet is intermittently arranged in the first direction and the second direction.   The embossed sheet according to any one of claims 1 to 5, wherein at least one of the plurality of lenses and the base material is roughened, and the surface roughness Ra is in the range of 0.01 µm to 5 µm.   A decorative sheet comprising the embossed sheet according to claim 1.