JPH08118578A - Decorative sheet and manufacture thereof - Google Patents

Abstract

PURPOSE: To provide a decorative sheet of high design in which an uneven pattern is formed on an outer surface without reducing a sense of blazing due to an inner fine uneven pattern and a method for manufacturing the same. CONSTITUTION: At least a lustrous layer 3, a design layer 4 and a transparent thermoplastic resin film 6 are laminated on an opaque thermoplastic resin film 2 in such a manner that the profundity of the upper boundary of the lustrous layer is 3 to 30μm and a groove uneven pattern 5 made of a pattern of line group state having an interval between protrusions is 1 to 1000μm is provided. An uneven pattern 7 is provided on the surface of the transparent film, and a rear uneven pattern 51 is provided on the rear surface of the opaque film. A method for manufacturing the same comprises the steps of sandwiching two films between two embossing rolls to apply hot pressure by simultaneously embossing both the front and rear surfaces of novel doubling to simultaneously form the patterns 5, 7 and 51, and laminating to integrate the film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative sheet having an uneven pattern on both the inside and the surface thereof, which is excellent in the design expression of depth and three-dimensional effect, and particularly suitable for the expression of wood grain, and its manufacturing method.

[0002]

2. Description of the Related Art Conventionally, in a woodgrain decorative sheet, various measures have been taken in order to more realistically express the texture of natural wood, in addition to the plan print pattern. One is the representation of conduits that appear three-dimensionally as grooves on the surface.
For example, it has been practiced to print a conduit pattern with a matte ink, which is actually flat, but gives a pseudo three-dimensional effect due to the matte effect. Furthermore, by actually forming a groove on the surface by embossing and inserting ink in the groove by wiping processing, it became possible to express a more realistic conduit by synchronizing the surface uneven pattern and the conduit pattern. Specifically, for example, a transparent vinyl chloride film is laminated and embossed at the same time by doubling embossing on the printed surface of a colored vinyl chloride film on which a wood grain pattern is printed, and ink is applied by wiping to the groove formed by embossing. It is a thing.

One of the different texture expressions of natural wood is the unique feeling of light and the feeling of movement of natural wood (hereinafter, both are referred to as "shining feeling" unless it is necessary to use them properly).
Is an expression of. The shiny feeling is a result of the light that has penetrated into the interior of wood being reflected by the internal tissue having a certain regularity of wood fibers and reaching the surface again to be emitted. Therefore, in order to mimic the reflection of light by the internal tissue, various attempts have been made to form a reflecting layer having fine irregularities capable of reflecting light with a certain regularity inside the decorative sheet. For example, in Japanese Utility Model Application Laid-Open No. 5-35394, a pattern layer is provided on the surface of an opaque thermoplastic resin film having luster on the surface, and then a groove-like concavo-convex pattern composed of a specific line group pattern is formed on the pattern layer. Disclosed is a decorative sheet in which a transparent resin layer is formed on the surface of a groove-shaped uneven pattern and a transparent resin layer is provided so that the transparent resin layer is thicker than the depth of the unevenness, and the transparent sheet is attached to a decorative base material with an adhesive. .

[0004]

However, if both the expression of a feeling of light due to the uneven pattern inside the decorative sheet and the conduit expression in synchronism with the surface uneven pattern can be produced, a more realistic expression of the texture of natural wood can be achieved. A sheet should be obtained, but no one with a convincing design has yet been obtained. For example, Japanese Examined Patent Publication No. 63-24470 discloses a method of forming a concavo-convex pattern on the surface while maintaining the concavo-convex pattern as the internal structure of the decorative sheet by devising the processing conditions of the doubling embossing. However, this method cannot be applied to a groove-shaped uneven pattern suitable for expressing a feeling of shiny because the sharpness of the fine unevenness is reduced by heat during embossing and the effect is reduced. There is.

Further, in Japanese Patent Publication No. 4-64443,
Disclosed is a method of dry laminating a thermoplastic resin film as a transparent resin layer on a groove-like concavo-convex pattern, and a method of expressing a conduit pattern on the surface of the transparent resin layer with a matte ink. However, with this method, the sharpness of the groove-shaped uneven pattern is still reduced due to the residual solvent in the adhesive during dry lamination, and the unevenness of the conduit is also poor, so compared to the combination of embossing and wiping described above, Is a plane, so there is a marked difference. Further, as described above, when the conduit is formed by embossing on the surface of the transparent resin layer formed by dry lamination later, the groove-shaped uneven pattern inside is dull due to heat during processing, and the feeling of shiny is reduced, and further, It may disappear.

In view of the above, the present invention provides a decorative sheet excellent in designability that can realistically express both the luster and the three-dimensional conduit of natural wood due to the unevenness on both the inside and the surface, and a method for producing the same. The purpose is to do.

[0007]

Therefore, in order to solve the above-mentioned problems in the decorative sheet of the present invention, at least a glitter layer and a pattern layer are laminated in this order on an opaque thermoplastic resin film, and further thereon. Is laminated with a transparent thermoplastic resin film and has a depth of 3 to 3 at the upper interface of the glitter layer.
A groove-like uneven pattern composed of a line group-like pattern having a convex portion-to-convex portion distance of 1 to 1000 μm is formed at 0 μm, and an uneven pattern is also formed on the surface of the transparent thermoplastic resin film. The back surface of the opaque thermoplastic resin film is also provided with a back surface uneven pattern.
Also, the wiping ink is formed in the concave and convex portions formed on the surface of the transparent thermoplastic resin film. Further, in the above structure, a surface protective layer is further provided on the surface.

Further, the method for producing a decorative sheet of the present invention comprises the following steps (A) and (B). (A) A glitter layer on one side of an opaque thermoplastic resin film,
Forming a pattern layer, or forming a pattern layer, a glitter layer on the back surface of a transparent thermoplastic resin film, or a glitter layer on one side of an opaque thermoplastic resin film, the back surface of a transparent thermoplastic resin film Step of forming a pattern layer on the. (B) When the transparent thermoplastic resin film and the opaque thermoplastic resin film are laminated by heat and pressure so that the glitter layer and the pattern layer are sandwiched, both films are sandwiched by two embossing plates and pressed. , The depth from the opaque thermoplastic resin film side to the interface on the upper layer side of the glitter layer due to embossing is 3 to 30 μm, and the interval between the convex portions is 1 to 1000 μm.
The formation of a groove-shaped concavo-convex pattern composed of a line group pattern of m, the formation of a back-side concavo-convex pattern on the back surface of an opaque thermoplastic resin film, and the transparent thermoplastic by embossing from the transparent thermoplastic resin film side. A doubling embossing process that simultaneously forms an uneven pattern on the surface of the resin film. Further, after the above steps, the wiping ink is formed by the wiping process in the concave and convex portions formed on the surface. Further, a surface protective layer may be provided on the surface after the above steps.

The present invention will be described below in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view showing an embodiment of the decorative sheet of the present invention. In the decorative sheet 1 of the present invention shown in the figure, a glitter layer 3 and a pattern layer 4 are laminated on an opaque thermoplastic resin film 2, and a transparent thermoplastic resin film 6 is further formed thereon.
Are laminated by the dove ring embossing. At that time, the opaque thermoplastic resin film 2 side on the back surface side and the transparent thermoplastic resin film 6 side on the front surface side are simultaneously embossed from both front and back surfaces, and the inside of the decorative sheet 1 from the back surface side. Then, the groove-shaped uneven pattern 5 is formed on the upper interface of the glitter layer 3, and the back-side uneven pattern 51 is formed on the back surface of the opaque thermoplastic resin film 2. From the front surface side, an expression of a conduit groove on the surface of the decorative sheet 1 is expressed. The uneven pattern 7 used for is formed. The target film that actually forms the glitter layer and the pattern layer to be interposed between the opaque thermoplastic resin film 2 and the transparent thermoplastic resin film 6 is
There are both the former and latter films, and the details will be described later.

FIG. 2 is a vertical sectional view showing another embodiment of the decorative sheet of the present invention. The decorative sheet 1 of the present invention in FIG. 2 is obtained by applying the wiping ink 8 to the concave portion of the uneven pattern 7 on the surface of the decorative sheet of FIG. 1 by the wiping process. FIG. 3 is a vertical cross-sectional view showing another embodiment of the decorative sheet of the present invention, in which transparent surface protective layers 9 and 9a are formed on the surface of the decorative sheet of FIG. The surface protective layer 9a is an ionizing radiation curable resin layer cured by ultraviolet rays or the like, and is for further improving the scratch resistance and the like of the surface.

First, the opaque thermoplastic resin film 2 constituting the decorative sheet of the present invention will be described. As the opaque thermoplastic resin film 2, an opaque, colored or non-colored one is used in order to conceal the base material to which the decorative sheet is attached. As such a film, a film of a colored vinyl chloride resin is usually used, but in addition to this, for example, polyolefin resins such as polyethylene and polypropylene, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate-vinyl chloride Polymers, polyvinyl butyral, polyvinyl fluoride, polyvinylidene fluoride, ethylene-vinyl acetate copolymers, ethylene-vinyl alcohol copolymers and other vinyl resins, polyethylene terephthalate, polyethylene terephthalate-isophthalate copolymers, polybutylene terephthalate, etc. Acrylic resin such as polyester resin, methyl polymethacrylate, methyl polyacrylate, ethyl polymethacrylate, polyacrylonitrile, polystyrene, acrylonitrile-
Butadiene-styrene resin (ABS), styrene resin such as acrylonitrile-styrene copolymer, polyolefin resin such as polyethylene, polypropylene, polymethylpentene, cellulose derivative such as cellulose acetate and nitrocellulose, nylon 6, nylon 66 A known film made of a resin such as polyamide resin, polyvinyl alcohol, or polycarbonate may be used. In order to make the film opaque, pigments such as titanium dioxide, carbon black, and rouge are mixed and mixed. Although the thickness of the film depends on the film strength and the plate depth of the embossing plate, it is thin enough to form a groove-like uneven pattern at the internal interlayer interface by embossing, and is about 40 to 80 μm, usually 50 to
About 60 μm is used. If it is too thick, the internal groove-like uneven pattern cannot be formed sufficiently, and if it is too thin, the film strength is reduced, and the printability is not obtained, making it impossible to print the glitter layer or the pattern layer.

Further, the transparent thermoplastic resin film 6 is
Securing a base for forming the concavo-convex pattern 7 from the front side, preventing the shape of the groove-like concavo-convex pattern 5 from being affected by embossing from the front side, and further separating the position of the lower pattern layer from the surface. The purpose is to add depth to the design layer. Therefore, as a transparent thermoplastic resin film, priority is given to ensuring a thickness that does not affect the formation of the groove-shaped concave and convex patterns on the lower side, and then with a thickness in the vertical direction that can express the depth, Further, it is sufficient that at least the transparency is such that the lower picture layer can be seen through and the light reaching the glittering layer can be reflected and returned to the surface. Further, if it is transparent, it may be colored or may be semi-transparent. As a transparent thermoplastic resin film,
A known film made of a resin that can be used for the opaque thermoplastic resin film described above can be used.

The thickness of the transparent thermoplastic resin film is usually about 50 to 200 μm, but if it is too thin, the shape of the groove-like uneven pattern is affected by the shape of the uneven pattern on the surface and deforms, and the pattern layer and the uneven surface are uneven. The distance from the pattern is reduced and the feeling of depth is reduced. If it is too thick, the depth increases, but the cost increases.
It is not always necessary that the shape of the groove-shaped uneven pattern is formed without being affected by the shape of the uneven surface pattern. Even if the shape of the uneven pattern on the surface is affected, the groove-like uneven pattern is internal and fine, and since the affected part is directly under the uneven pattern, the appearance is unknown even if there is some effect. , It does not affect the design.

If the opaque thermoplastic resin film is not thinned with respect to the transparent thermoplastic resin film, the shape of the grooved uneven pattern on the inside affects the shape of the uneven surface pattern. In the method for producing a decorative sheet of the present invention described in detail later,
It is sandwiched by two embossing plates from both sides and pressed, but in order to prevent only one of them from being involved in the formation of internal irregularities and the other not, the degree of softening of the resin of both films also affects, This can be achieved by providing a different film thickness.

The glitter layer 3 reflects light inside the decorative sheet in order to express a shiny feeling, and it is sufficient if it has light reflectivity, and is used as a metal layer or a printing layer of ink containing a glitter pigment. The pattern is formed on the entire surface or in a pattern.
When formed as a metal layer, aluminum, chrome,
A metal or alloy such as copper, iron or nickel is provided by a known method such as vacuum deposition, sputtering, electroless plating. In this case, the thickness of the glitter layer is usually preferably about 4 to 1000Å. When forming as a printing layer, a glittering ink containing a glittering pigment is provided by a known printing means such as gravure printing, flexographic printing, silk screen printing and the like. Examples of bright pigments include metal powders such as gold powder, silver powder, aluminum powder, copper powder, brass powder, and metal flakes, or metallic luster pigments having metallic luster such as cut pieces of metal-deposited synthetic resin film, and titanium dioxide coating. Known bright pigments such as pearl pigments having pearl luster or interference luster such as mica, fish scales, bismuth chloride and the like can be used, but titanium dioxide-coated mica is preferable. A mixture of these glitter pigments with a known vehicle is used as a glitter ink. As the vehicle, vinyl-based, acrylic-based, amino-based, aminoalkyd-based, polyurethane-based, cellulose-based, butyral-based resins, etc. are used. In this case, the thickness of the glitter layer is usually preferably about 1 to 10 μm. Further, the glitter layer may be formed not by the ink but by adjusting as a coating liquid and coating. The glitter layer is prepared by kneading a glitter pigment in an opaque thermoplastic resin,
It can also be integrated with an opaque thermoplastic resin.

For the pattern layer 4, various patterns such as a wood grain pattern of natural wood, a stone pattern pattern of marble, granite, etc., a cloth pattern pattern, or an abstract pattern pattern such as a figure and a symbol are appropriately used depending on the purpose of the decorative sheet. The decorative sheet of the present invention is particularly suitable for reproducing the grain pattern of natural wood. The pattern layer is a vehicle using vinyl resin, acrylic resin, cellulose resin, aminoalkyd resin, butyral resin, etc., and if necessary, colorants such as pigments and dyes, extender pigments, stabilizers, plasticizers, etc. Known printing ink mixed with, gravure printing,
It is formed by a known printing means such as flexographic printing and silk screen printing.

The target film for forming the glitter layer and the pattern layer described above may have various modes as long as the desired layer structure of the decorative sheet can be obtained. For example,
Glittering layer 3 against opaque thermoplastic resin film 2
And a mode of forming the pattern layer 4. A mode in which the pattern layer 4 and the glitter layer 3 are sequentially formed on the back surface side of the transparent thermoplastic resin film 6. There is a mode in which the glitter layer 3 is formed on the opaque thermoplastic resin film 2 and the pattern layer 4 is formed on the back surface of the transparent thermoplastic resin film 6. The aspect of
Although it requires two printing steps and is costly, there is a case where only a pattern layer is printed on a transparent thermoplastic resin film by kneading a bright pigment into an opaque thermoplastic resin film in advance as a deformation of is there. In relation to film thickness and embossing, thinner opaque thermoplastic resin films are more likely to form groove-like uneven patterns inside, but when they are too thin, printing such as register accuracy and machine suitability in multicolor printing is performed. In such a case, it is preferable to form the pattern layer and the glitter layer on the side of the thicker transparent thermoplastic resin film because the suitability is lowered. In addition, even if it is thin, if it has mechanical suitability, it is possible to print the entire surface of the glitter layer which does not require registration accuracy.

The groove-shaped concavo-convex pattern 5 controls the reflection direction of the light reflected by the glitter layer 3 and expresses a design feeling due to internal light reflection such as a shiny feeling of natural wood. FIG. 4 is an enlarged view of a cross section of a groove-like concavo-convex pattern, which is a so-called parallel line pattern and is a line-group-shaped pattern composed of a large number of line groups. As shown in the figure, the groove-shaped uneven pattern has a groove depth of 3 to 30 μm and an interval between the protrusions of 1 to 100.
It has a shape of 0 μ, and the interval between the convex portions is more preferably about 1 to 100 μm for expressing the shiny feeling of natural wood. The depth and the interval between the convex portions do not have to be constant in the line group, and in the case of having a partition as shown in FIG. 5D described later, the value may be changed for each partition, or a little between adjacent lines. You may change it one by one. By changing the shape in this way, the light reflection effect can be changed slightly depending on the place.

FIG. 5 is a plan view showing various aspects of the groove-shaped concavo-convex pattern formed by the above-mentioned line pattern. Figure 5
5A is a parallel line pattern composed of a wave-shaped parallel curve group 10, FIG. 5B is a parallel line pattern composed of a plurality of straight line groups having different directions in a plurality of sections, and FIG. 5C is a parallel curve. A parallel line pattern in which the group 10 and the parallel straight line group 11 are combined, FIG. 5D shows a parallel line pattern formed by the parallel curve group 10 of closed curves, and FIG. 5E shows parallel lines having different directions in a plurality of sections. A line pattern consisting of a group of curves, FIG.
The parallel line pattern which consists of the non-parallel curve group 12 which changes the function parameter of a function curve and the space | interval between each curve changes in a line direction is shown. Further, a line pattern or the like composed of a measurement curve group 13 using a measurement waveform obtained by observing voice with an oscilloscope as shown in FIG. 5G may be used. The function curve includes, for example, a sine wave curve, a cycloid curve, an elliptic function curve, a Bessel function curve, and the like. Various measurement waveforms such as a waveform measured by measuring the surface roughness of an object and output by a pen recorder can be used. Above all, a line pattern made up of a wave-shaped curve group such as a sine wave curve is preferable as a basic pattern for expressing the feeling of movement of the luster of natural wood. As described above, the line group-like pattern forming the groove-like uneven pattern is a line group in which the unevenness of adjacent lines changes the depth and the unevenness interval to be the same or subtly, and these line groups are divided. By combining them, a reflective pattern of light is produced.

Since the groove-shaped uneven pattern as described above is intended to reflect the light entering the interior of the decorative sheet by the uneven surface of the groove-shaped uneven pattern, the glitter layer which is a light-reflecting functional layer. Is formed on at least the interface on the upper surface side.

The groove-like concavo-convex pattern 5 is formed by laminating the opaque thermoplastic resin film 2 and the transparent thermoplastic resin film 6 so that they are laminated and integrated at the same time, so-called doubling embossing (of the present invention). The detailed method will be described later). The embossing is performed by flat pressure type or circular pressure type embossing. The embossed surface is the opaque thermoplastic resin film side that is the back surface. In addition, on the back surface side of the opaque thermoplastic resin film, when the groove-shaped uneven pattern is formed, a back surface uneven pattern 51 corresponding to the groove-shaped uneven pattern and the uneven pattern is formed as a result.

On the other hand, the concavo-convex pattern 7 formed on the surface of the transparent thermoplastic resin film 6 reproduces a three-dimensional pattern on the outer surface of the decorative sheet, and a wood-grained decorative sheet expresses a recessed conduit pattern. It is a thing. The depth of the uneven pattern 7 is
If it is a wood grain conduit handle, it is usually about 40 to 60 μm, but it is not particularly limited to this range. It can change depending on the design to be expressed. The concavo-convex pattern 7 is also formed by embossing simultaneously with the formation of the groove-shaped concavo-convex pattern 5. The embossed surface is the transparent thermoplastic resin film side that is the surface side.

The conventional doubling embossing is performed by sandwiching two films between the embossing roll and the pressing roll, but the doubling embossing performed in the present invention uses the second embossing roll instead of the pressing roll. It is sandwiched between two embossing rolls (hereinafter, processing by this method is referred to as "simultaneous doubling embossing on the front and back sides" in order to explicitly distinguish it from the conventional dowel ring embossing). FIG. 6 is a conceptual diagram showing such double doubling embossing of the present invention, in which the groove-shaped concavo-convex pattern 5 and the concavo-convex pattern 7 are simultaneously formed, and an opaque thermoplastic resin film and a transparent thermoplastic resin film are formed. The resin film is laminated and integrated. It should be noted that the figure is an example of the embossing process of the circular pressure type. Of course, the doubling front and back simultaneous embossing processing of the present invention can also be performed by a flat pressure type. As shown in the figure, the transparent thermoplastic resin film 6 and the opaque thermoplastic resin film 2 are supplied and sandwiched between two embossing rolls 21 and 22, and both films are fused by heat and pressure. It is a method of embossing with an embossing roll at the same time when the layers are integrated. The embossing roll 21 is for forming the concavo-convex pattern 7 on the front surface, and the embossing roll 22 is for forming the groove-shaped concavo-convex pattern 5 and the rear surface concavo-convex pattern 51.

FIG. 7 is a conceptual view showing a doubling front and back simultaneous embossing device which is actually used in the method for manufacturing a decorative sheet of the present invention. This is a configuration in which the pressing roll of the conventional doubling embossing device is replaced with the second embossing roll. In the figure, the opaque thermoplastic resin film 2 and the transparent thermoplastic resin film 6 (the glitter layer and the pattern layer are formed by some films or separately as described above) are heated by the nip roll 25. It is heated and softened along the drum 23 by the radiant heating devices 24a and 24b and supplied between the embossing rolls 21 and 22,
After carrying out laminated integration of front and back simultaneous embossing and film,
It is cooled by the cooling roll 26 and becomes a decorative sheet.

In the method of using the combination of the film and the embossing roll illustrated in FIG. 7, the embossing roll 21 which is responsible for the embossing on the back side is the metal embossing roll which has been conventionally used for the conduit embossing on the surface of the decorative sheet. Can be used as is. On the other hand, the embossing roll 22 responsible for the embossing on the front surface side is made of resin such as rubber or plastic. Silicon rubber, nitrile rubber, ebonite, ethylene propylene rubber, etc. can be used as the rubber, and polyacetal, epoxy resin, etc. can be used as the plastic. The back side of the embossing roll may not be made of metal and the front side may be made of resin, and vice versa. If both rolls are made of metal and arranged so that the convex parts are not in contact with each other, the roll durability can be improved, but it is necessary to maintain a high distance accuracy and parallelism between the axes of both rolls. At this point, embossing can be easily performed by using a resin roll on one side. However, if the hardness of the resin is too soft, the irregularities of the embossing plate will be deformed and the embossing will not be sufficient, and if it is too hard, the meaning of the resin will be lost. When using rubber, the rubber hardness is preferably 75 to 90 degrees (JIS K7215 durometer hardness A type). Generally, a groove-shaped uneven pattern is required on the entire surface of the decorative sheet for expressing a feeling of shiny feeling, and a metal roll is suitable for forming a fine groove-shaped uneven pattern. Therefore, the facing rolls are preferably made of rubber or resin. Even if it is a roll made of rubber or resin,
It is possible to form sufficiently on the surface of the decorative sheet, as long as the unevenness has a size as large as a conduit shape and a depth. The unevenness is formed on the resin embossing roll by a laser engraving method or the like.

The embossing conditions differ depending on the thermoplastic resin film used. For example, in the case of a vinyl chloride film, the heating temperature of the film is about 120 to 170 ° C, and the plate surface temperature of the embossing plate is about 30 to 70 ° C.

As described above, the decorative sheet of the present invention can be obtained. By further applying the wiping ink 8 to the concave and convex portions formed on the surface by the known wiping process, a more realistic conduit pattern is expressed. it can.

If the surface of the wiped or unprocessed surface is coated with a surface protective layer 9 by coating or painting, surface properties such as abrasion resistance, stain resistance, etc., or matte feeling, etc. Surface design can be imparted. The surface protective layer may be colored as long as it is transparent, or may be translucent. As the surface protective layer 9, a well-known top coating material can be used, for example, a coating material made of a two-component curing type resin such as polyurethane, polyester, epoxy and melamine, or a coating material made of an ionizing radiation curable resin. Since the ionizing radiation curable resin does not require heat for curing, it is possible to prevent the fine groove-shaped uneven pattern inside from being blunted by the heat during curing unlike the thermosetting resin.

As the ionizing radiation curable resin, known ultraviolet curable resins and electron beam curable resins can be used. Examples of the ionizing radiation curable resin include, for example, an oligomer having two or more photopolymerizable functional groups such as an ethylenically unsaturated group such as an acryloyl group or a methacryloyl group and an epoxy group in a molecule, and / or a monofunctional and a polyfunctional. The monomer of the above is appropriately mixed, and if necessary, a photopolymerization initiator, a photosensitizer, a non-ionizing radiation curable resin such as a cellulose resin, a colorant,
It contains additives such as a filler, a matting agent, a stabilizer, and a thermal polymerization inhibitor. When the ionizing radiation curable resin is classified from the above-mentioned oligomer resin system, for example, urethane acrylate system (including methacryloyl group; the same applies hereinafter), epoxy acrylate system, polyester acrylate system,
Examples thereof include acrylates such as silicone acrylate and melamine acrylate, unsaturated polyesters, epoxy resins, and polyene / polythiols. When ionizing radiation curable resin is used for the surface protective layer,
Particularly excellent surface properties such as abrasion resistance and stain resistance can be imparted.

The surface protective layer 9 is formed by applying the above-mentioned top coating composition by gravure coating, comma coating, flow coating,
After coating by a known coating or coating method such as roll coating, spray coating or brush coating, it may be cured by heating, ultraviolet rays, electron beams or the like. Further, it can be formed by a printing method such as gravure printing. The thickness of the surface protective layer is
Usually, it is about 10 to 15 μm.

Thus, the decorative sheet of the present invention and the method for producing the same can provide a decorative sheet having excellent designability. Further, the decorative sheet of the present invention is particularly suitable for the expression of wood grain, but in addition, it is also used for various design expressions such as stone, cloth, or abstract pattern by taking advantage of its excellent depth, three-dimensional effect, and shiny feeling. can do.

[0032]

In the decorative sheet of the present invention, since the light-reflecting surface of the inner glittering layer has the groove-like concavo-convex pattern, the feeling of luster and the depth due to the inner picture layer and the glittering layer are expressed. Further, a realistic three-dimensional effect is expressed by the uneven pattern on the surface and further the wiping ink put in the concave part of the uneven pattern. As a result, the luster of the natural wood and the texture of the conduit are realistically expressed.

In the method for producing a decorative sheet of the present invention, a groove-shaped uneven pattern that becomes internal unevenness and a concave-convex pattern used for expressing a conduit groove on the front surface are formed, a rear surface concave-convex pattern is formed, and a transparent thermoplastic resin is used. The lamination and integration of the resin film and the opaque thermoplastic resin film are completed in one step, that is, by sandwiching the two films between the two embossing rolls and applying heat and pressure.

[0034]

EXAMPLES The decorative sheet of the present invention and the method for producing the same will be described below with reference to specific examples.

Example 1 Transparent vinyl chloride film (manufactured by Riken Vinyl Industry Co., Ltd., thickness 100 μm, plasticizer 23 p)
hr) on one side with a vinyl chloride-vinyl acetate resin ink, a wood grain pattern layer, and then a vinyl chloride-vinyl acetate resin pearl ink containing a bright pigment (Showa Ink KK XPGS Pearl). ) With a glitter layer on the entire surface,
It was formed by gravure printing. Next, by a circular pressure type doubling front and back simultaneous embossing device as shown in FIG. 7, the surface of the film obtained above on which the glitter layer was formed, and a colored opaque vinyl chloride film (manufactured by Riken Vinyl Industry Co., Ltd., At the same time as bonding with a thickness of 60 μm and a plasticizer of 23 phr), embossing was performed on both front and back surfaces at the same time to obtain a decorative sheet of the present invention. From the opaque thermoplastic resin film side, which is the back surface side, a metal embossing roll having a wavy line pattern composed of sinusoidal parallel curve groups with a groove-shaped concavo-convex pattern having a depth of 35 μm and a convex interval of 70 μm. It was used. An embossing roll made of ethylene propylene rubber (hardness: 90 degrees according to JIS-K7215) in which a conduit shape was formed by laser engraving was used from the transparent thermoplastic resin film side which was the surface side. The embossing conditions were a film heating temperature of 160 ° C., a plate surface temperature of 60 ° C., and a run speed of 10 m / min.

Example 2 With respect to the decorative sheet obtained in Example 1, a urethane resin-based wiping ink (manufactured by Showa Ink Co., Ltd.) was formed in the concave and convex portions formed on the surface.
W-141) was used for wiping and ink was put in the recesses to obtain a decorative sheet of the present invention.

Example 3 On the surface of the decorative sheet obtained in Example 2, urethane resin surface protection ink (Wiping No. 81 manufactured by Showa Ink Co., Ltd.) was printed on the entire surface by gravure printing. To form a surface protection layer,
A decorative sheet of the present invention was obtained.

[0038]

As described in detail above, according to the decorative sheet of the present invention, excellent depth, depth, shining feeling (shining feeling and moving feeling of shining), and surface stereoscopic effect can be expressed. In particular, since it is possible to express both the shiny feeling of wood grain and the expression of a three-dimensional conduit pattern on the surface, it is possible to express an extremely realistic texture of natural wood.
Further, according to the method for producing a decorative sheet of the present invention, expression of the groove-shaped uneven pattern and the surface conduit groove, etc., without reducing the sharpness of the internal groove-shaped uneven pattern used for expressing the feeling of shinyness. The uneven pattern used for can be formed at the same time. As a result, the manufacturing cost is low and the productivity is excellent. Also, depending on the resin film on both sides and the conditions of embossing, when forming the concavo-convex pattern of the conduit on the surface of the decorative sheet, the groove-shaped concavo-convex pattern at the internal interface of the decorative sheet also reflects the irregularities of the subtle surface concavo-convex pattern. Therefore, a decorative sheet having a feeling of shining closer to natural wood can be obtained.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a decorative sheet of the present invention.

FIG. 2 is a vertical sectional view showing another embodiment of the decorative sheet of the present invention.

FIG. 3 is a longitudinal sectional view showing another embodiment of the decorative sheet of the present invention.

FIG. 4 is an enlarged cross-sectional view of a groove-shaped concavo-convex pattern used in the decorative sheet of the present invention.

FIG. 5 is a plan view showing various examples of groove-shaped uneven patterns used for the decorative sheet of the present invention.

FIG. 6 is a conceptual diagram showing doubling front and back simultaneous embossing, which is a method for manufacturing a decorative sheet of the present invention.

FIG. 7 is a conceptual diagram of a manufacturing apparatus that simultaneously embosses doubling front and back, which is a method for manufacturing a decorative sheet of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Decorative sheet 2 Opaque thermoplastic resin film 3 Glittering layer 4 Picture layer 5 Groove-shaped uneven pattern 51 Backside uneven pattern 6 Transparent thermoplastic resin film 7 Uneven pattern 8 Wiping ink 9 Surface protective layer 9a Surface protective layer (UV curing) Resin layer) 10 Parallel curve group 11 Parallel straight line group 12 Non-parallel curve group 13 Measurement curve group 21 Front side embossing plate 22 Back side embossing plate 23 Heating drum 24a, 24b Radiant heating device 25 Nip roll 26 Cooling roll

Claims (6)

[Claims] 1. An opaque thermoplastic resin film, on which at least a glitter layer and a picture layer are laminated in this order, and a transparent thermoplastic resin film is further laminated thereon, and a deep interface is formed at the upper interface of the glitter layer. Is 3 to 30 μm and the interval between the convex portions is 1 to 1000 μm, and a groove-shaped concave-convex pattern is formed, and the surface of the transparent thermoplastic resin film has irregularities. A decorative sheet, wherein a pattern is formed, and a back surface uneven pattern is also formed on the back surface of the opaque thermoplastic resin film. 2. The decorative sheet according to claim 1, wherein the wiping ink is formed in the concave and convex portions formed on the surface of the transparent thermoplastic resin film. 3. The decorative sheet according to claim 1, which has a surface protective layer on the surface of the decorative sheet. 4. A method of manufacturing a decorative sheet, which comprises the following steps (A) and (B): (A) A glitter layer on one side of an opaque thermoplastic resin film,
Forming a pattern layer, or forming a pattern layer, a glitter layer on the back surface of a transparent thermoplastic resin film, or a glitter layer on one side of an opaque thermoplastic resin film, the back surface of a transparent thermoplastic resin film Step of forming a pattern layer on the. (B) When the transparent thermoplastic resin film and the opaque thermoplastic resin film are laminated by heat and pressure so that the glitter layer and the pattern layer are sandwiched, both films are sandwiched by two embossing plates and pressed. , The depth from the opaque thermoplastic resin film side to the interface on the upper layer side of the glitter layer due to embossing is 3 to 30 μm, and the interval between the convex portions is 1 to 1000 μm.
The formation of a groove-shaped concavo-convex pattern composed of a line group pattern of m, the formation of a back-side concavo-convex pattern on the back surface of an opaque thermoplastic resin film, and the transparent thermoplastic by embossing from the transparent thermoplastic resin film side. A doubling embossing process that simultaneously forms an uneven pattern on the surface of the resin film. 5. A method for manufacturing a decorative sheet, comprising forming a wiping ink in a concave and convex portion formed on the surface of the decorative sheet obtained by the manufacturing method according to claim 4 by a wiping process. 6. A method for manufacturing a decorative sheet, comprising providing a surface protective layer on the surface of the decorative sheet obtained by the manufacturing method according to claim 4.