JP5819181B2 - Decorative sheet and manufacturing method thereof - Google Patents

Description

  The present invention relates to a decorative sheet having a pattern on the back surface of a transparent resin substrate and a method for producing the decorative sheet.

  Various attempts have been made in the past to obtain a decorative sheet by printing a pattern on the back side of a transparent resin base material so that the pattern can be seen three-dimensionally from the surface side of the base material. (For example, refer to Patent Document 1). As one aspect thereof, the above pattern is in a state where the transparent printing layer is covered by printing using a transparent printing layer formed on a part of the back surface of the substrate and an ink containing metallic powder (metallic ink). What was comprised with the metallic printing layer formed in the back surface of a base material is known.

  According to this decorative sheet, when light is incident on the decorative sheet from the surface side of the substrate, the light hits the metal powder in the metallic printed layer and is reflected, and the portion where the transparent printed layer is not formed is formed. Since the dispersed state of the metal powder in the metallic printing layer is different from the place where it is made, the light reflection mode is different. In particular, in the place where the transparent printing layer is formed, the reflection of light by the metal powder is performed deeper by the thickness of the transparent printing layer than the place where the transparent printing layer is not formed. Therefore, in the place where the transparent printing layer is formed, the metallic printing layer can be seen in the back than the place where the transparent printing layer is not formed, and the pattern can be seen three-dimensionally.

JP 2002-200957 A

  By the way, not only the metallic printing layer formed by printing using the metallic ink, but also the colored printing layer formed by printing using ordinary colored ink (solid ink) containing no metal powder. There is a demand for a three-dimensional appearance.

  In this case, as shown in FIG. 4, the decorative sheet 50 includes a transparent substrate 51 formed into a sheet shape with a resin and a transparent printed layer formed by printing on a part of the back surface 51 </ b> B of the substrate 51. 52 and a colored printing layer 53 formed on the back surface 51B of the substrate 51 in a state of covering the transparent printing layer 52 by printing using colored ink. In the decorative sheet 50, the pattern D is configured by the transparent printing layer 52 and the colored printing layer 53.

  However, since there is no colored printed layer 53 that reflects light in place of the above-described metal powder, the appearance of a pattern like a metallic printed layer cannot be expected. Therefore, in the decorative sheet 50, it is difficult to make the pattern D appear three-dimensionally by simply changing the metallic print layer to the colored print layer 53 using solid ink.

  The following can be considered as the cause. In general printing with colored ink (solid ink), solvent-based ink containing a solvent for improving the adhesion of the colored printing layer 53 to the base 51 and the transparent printing layer 52 is used. When this solvent-type ink is also used for printing for forming the colored print layer 53, depending on the type of solvent contained in the solvent-type ink, as shown in FIG. The transparent printing layer 52 is dissolved by the solvent in the colored ink. At this time, the outer edge portion 52A of the transparent printing layer 52 is also dissolved, and the boundary line between the portion where the transparent printing layer 52 is formed and the portion where the transparent printing layer 52 is not formed disappears or is blurred on the back surface 51B of the substrate 51. Or As a result, it is considered that the pattern D cannot be clearly seen from the surface 51A side of the base material 51, and accordingly, the depth feeling of the pattern D is lost and the pattern D cannot be seen three-dimensionally.

  This invention is made | formed in view of such a situation, The objective is the decoration sheet | seat which can make the pattern comprised by a transparent printing layer and a colored printing layer visible three-dimensionally, and its It is to provide a manufacturing method.

In order to achieve the above object, the decorative sheet according to claim 1 is a transparent sheet formed of any one of a polyolefin resin, a polyester resin, an acrylic resin, a vinyl chloride resin, and a polycarbonate resin. Base material, a transparent printing layer formed to a thickness of 20 μm or more by printing using an ultraviolet curable ink on a part of the back surface of the base material, and a force for dissolving the base material and the transparent printing layer A colored printing layer formed on the back surface of the substrate in a state of covering the transparent printing layer by printing using a colored ink containing a weak alcohol solvent, and constituting a pattern together with the transparent printing layer This is the gist.

Yes color printing layer may be constituted by a single layer, or may be constituted by a plurality of layers including a protective layer.
According to said structure, a transparent printing layer is located in a part of back surface of a transparent resin base material. Moreover, a colored printing layer is located in the back side of a base material in the state which coat | covered the transparent printing layer. Therefore, in the location where the transparent printing layer is not formed on the back surface of the base material, the colored print layer is positioned on the base material in a state of being in direct contact with the back surface of the base material. On the other hand, in the location where the transparent printing layer is formed, the colored printing layer is located on the base material through the transparent printing layer.

Here, the colored ink containing an alcohol solvent used for printing for forming a colored printing layer is a colored ink containing a solvent for improving the adhesion of the colored printing layer to the substrate and the transparent printing layer. Compared to the above, the power to dissolve the substrate and the transparent printing layer is weak. Therefore, on the back surface of the substrate, the boundary line between the portion where the transparent printing layer is formed and the portion where the transparent printing layer is not formed remains without disappearing. And a pattern is comprised by the said transparent printing layer and a colored printing layer.

  When the said decorative sheet is seen from the surface side of a base material, a colored printing layer can be seen through a base material in the location where the transparent printing layer is not formed among the back surfaces of a base material. On the other hand, in the location where the transparent printing layer is formed, the colored printing layer can be seen through the base material and the transparent printing layer having a thickness of 20 μm or more.

In addition, as described above, the boundary portion between the portion where the transparent printing layer is formed and the portion where the transparent printing layer is not formed remains in a linear shape on the back surface of the substrate.
Therefore, the colored printing layer can be seen at the back of the portion where the transparent printing layer is formed by the thickness of the transparent printing layer than the portion where the transparent printing layer is not formed. As a result, the pattern looks three-dimensional with a sense of depth.

In addition, if the thickness of the transparent printing layer is less than 20 μm, it is difficult to obtain the depth feeling of the pattern .

  Here, if the transparent printing layer is formed by printing using solvent-based ink, the solvent is volatilized after application of the solvent-based ink, whereby the transparent printing layer is formed. The thickness of this transparent printing layer becomes thinner than the thickness at the time of application | coating of solvent ink. Moreover, the thickness per layer of the transparent printing layer that can be formed is about 10 μm at the maximum. Therefore, in order to obtain a transparent printing layer having a thickness of 20 μm or more using solvent-based ink, it is necessary to overprint the solvent-type ink a plurality of times.

  However, when a plurality of transparent printing layers are formed not only by solvent type ink but also by ink overprinting, the previously formed layer becomes cloudy. The degree of white turbidity in the entire transparent printing layer increases as the number of transparent printing layers increases. This white turbidity impairs the transparency of the entire transparent printed layer, which in turn impairs the sense of depth of the pattern.

In this regard, since the transparent printing layer is formed by printing using an ink of UV-curable ink of the ultraviolet-curable coated on the substrate is cured by ultraviolet rays are irradiated, the transparent printing layer . Since the ultraviolet curable ink does not contain a solvent, unlike the solvent-type ink, the solvent does not volatilize, and when the transparent printing layer is formed, the thickness at the time of application is maintained.

  Therefore, in the case of ultraviolet curable ink, a transparent printing layer having a thickness of 20 μm or more can be obtained even if overprinting is not performed many times, that is, even when printing is performed once or printing is performed a small number of times. As a result, white turbidity due to overprinting of ink hardly occurs, and a sense of depth in the pattern can be obtained satisfactorily.

The gist of the invention according to claim 2 is that, in the invention according to claim 1, the transparent printing layer is formed to a thickness of 100 μm or less at a plurality of spaced apart locations on the back surface of the substrate. .

  Here, if the thickness of each transparent printing layer exceeds 100 μm, the adjacent transparent printing layer becomes deep, and when printing the colored printing layer, the colored ink is allowed to enter the adjacent transparent printing layer, which is good on the back surface of the substrate It becomes difficult to apply to. In this respect, when each transparent printing layer has a thickness of 100 μm or less as in the invention described in claim 3, the colored ink can easily enter between adjacent transparent printing layers, and is good for the back surface of the substrate. To be applied.

The gist of the invention described in claim 3 is that, in the invention described in claim 1 or 2 , the colored printing layer is formed to a thickness of 2 μm to 20 μm.
The said thickness says the thickness about the layer printed for the first time, when a colored printing layer is comprised by the several layer containing a protective layer.

Here, the alcohol-based solvent in the colored ink forming the colored printing layer has a considerable effect of dissolving the base material and the transparent printing layer. In order to suppress dissolution of the base material and the transparent printing layer by the alcohol solvent, it is desirable that the volatilization time of the solvent is short. In this respect, it is preferable that the colored printing layer is thin. However, there is a limit to reducing the thickness of the colored printing layer from the viewpoint of forming a colored printing layer capable of recognizing colors on the back surface of the substrate or the back side of the transparent printing layer.

In this respect, as in the invention described in claim 3 , if the colored printing layer is formed to a thickness of 2 μm or more, the color can be recognized. Moreover, if the colored printing layer is formed to a thickness of 20 μm or less, the volatilization time of the alcohol solvent is short, and dissolution of the base material and the transparent printing layer by the solvent is suppressed to an allowable range.

The gist of the invention described in claim 4 is that, in the invention described in any one of claims 1 to 3 , the colored printing layer is formed by printing using black ink.
Here, among the colored inks, the black ink hardly reflects light. The same applies to the colored printing layer formed by printing using black ink. When this black ink is a solvent-type ink containing a solvent for enhancing the adhesion of the colored printing layer to the substrate and the transparent printing layer, the substrate and the transparent printing layer are dissolved, and the pattern is three-dimensional. The degree of obscurity is increased.

Therefore, as in the invention described in claim 4 , when the colored printing layer is formed by printing using black ink, the pattern is formed as compared with the case of forming by printing using colored ink of another color. Can be more effectively obtained.

The method for producing a decorative sheet according to the invention described in claim 5 is a method for producing a back surface of a transparent substrate formed into a sheet shape from any one of a polyolefin resin, a polyester resin, an acrylic resin, a vinyl chloride resin, and a polycarbonate resin . In some cases, a transparent printing layer having a thickness of 20 μm or more is printed using an ultraviolet curable ink, and a colored ink containing an alcohol solvent having a weak ability to dissolve the base material and the transparent printing layer is used. Forming a pattern comprising the transparent printing layer and the colored printing layer on the back surface of the substrate by forming a colored printing layer on the back surface of the substrate by printing in a state of covering the transparent printing layer. Is the gist.

  When a decorative sheet is manufactured according to the above manufacturing method, a transparent printing layer having a thickness of 20 μm or more is formed by printing on a part of the back surface of a transparent substrate formed into a sheet shape with a resin. .

Next, a colored ink containing an alcohol solvent is used, and a colored printing layer is formed on the back surface of the substrate by printing in a state where the transparent printing layer is covered with the colored ink.
Here, the colored ink containing the alcohol solvent dissolves the base material and the transparent printing layer as compared with the colored ink containing the solvent for enhancing the adhesion of the colored printing layer to the base material and the transparent printing layer. Since the force is weak, a transparent printing layer with a clear outer edge remains on the back surface of the base material, being hardly dissolved by the alcohol solvent.

And a pattern is formed in the back surface of a base material by the said transparent printing layer and a colored printing layer.
The invention according to claim 6 is the invention according to claim 5 , wherein the transparent printing layer is formed by irradiating ultraviolet rays after applying an ultraviolet curable ink to the back surface of the substrate. The gist is to cure the ultraviolet curable ink.

  According to said manufacturing method, in the case of printing a transparent printing layer, an ultraviolet-ray is irradiated after an ultraviolet curable ink is apply | coated to the back surface of a base material. By this irradiation, the ultraviolet curable ink applied to the substrate is cured and a transparent printing layer is formed. Since the ultraviolet curable ink does not contain a solvent, unlike the solvent-type ink, the solvent does not volatilize, and when the transparent printing layer is formed, the thickness when the ink is applied is maintained.

  Therefore, a transparent printing layer having a thickness of 20 μm or more can be obtained without overprinting with an ultraviolet curable ink many times. As a result, white turbidity due to overprinting of ink hardly occurs, and a sense of depth in the pattern can be obtained satisfactorily.

The invention according to claim 7 is the invention according to claim 5 or 6 , wherein in forming the colored printing layer, the colored ink containing the alcohol solvent is used as the back surface of the substrate and the transparent printing layer. The gist is to forcibly volatilize the alcohol solvent by spraying hot air after coating.

Here, the colored ink containing the alcohol solvent will dissolve the substrate and the transparent printing layer as compared with the colored ink containing the solvent for improving the adhesion of the colored printing layer to the substrate and the transparent printing layer. The power to do is weak. However, if it takes a long time for the alcoholic solvent to volatilize, the action of the alcoholic solvent that dissolves the base material and the transparent printing layer works for a long time.

In this regard, in the invention according to claim 7 , after the colored ink containing the alcohol solvent is applied to the back surface and the transparent printing layer of the base material, the alcohol solvent in the colored ink is sprayed with hot air. Is forcibly volatilized, and the volatilization time of the solvent is shortened. Along with this, the working time for dissolving the base material and the transparent printing layer is shortened, and as a result, the phenomenon that the base material and the transparent printing layer are dissolved by the alcohol solvent is further suppressed. The

According to the present invention, a transparent printing layer having a thickness of 20 μm or more is formed on a part of the back surface of a resin-made transparent base material, and transparent by printing using a colored ink containing an alcohol solvent. Since the colored printing layer is formed on the back surface of the base material in a state where the printing layer is covered, the pattern constituted by the transparent printing layer and the colored printing layer can be seen three-dimensionally.

The fragmentary sectional view of the decoration sheet in one embodiment which materialized the present invention. The expanded sectional view of the X section in FIG. Schematic explaining the pattern (carbon woven pattern) seen through a base material. The fragmentary sectional view which shows the decorating sheet | seat in which the colored printing layer by the solid ink was formed instead of the conventional metallic printing layer. The expanded sectional view of the Y section in FIG.

Hereinafter, an embodiment in which the present invention is embodied in a decorative sheet for automobiles and a method for manufacturing the same will be described with reference to FIGS. 1 to 3.
The automobile is equipped with various automobile interior parts such as a console lid, a center cluster, and a switch base. These automotive interior parts have a three-dimensional surface such as a curved surface or a bent surface. The decorative sheet according to the present embodiment is used for decorating the surface of such an automotive interior product, and is deformed along the surface shape of the automotive interior product. It is fixed to the surface of the interior product. The decorative sheet fixed to the automotive interior component constitutes the design surface of the automotive interior component.

  The decoration by the decoration sheet is performed by a pattern such as a geometric pattern, for example. Here, as shown in FIG. 3, decoration is performed (pattern is added) by a pattern D having an appearance of a so-called carbon woven pattern (also called carbon tone) in which carbon fiber yarns are woven in a plain weave. )ing. The plain weave is a structure in which wefts and wefts are alternately raised and lowered in the woven structure. In order to exhibit the appearance of the carbon woven pattern, the pattern D has a quadrangular shape (square), and two types of pattern portions (a plurality of light first pattern portions D1 and a plurality of dark second patterns) having different shades from each other. It is constituted by a pattern portion D2). In FIG. 3, each first pattern portion D1 and each second pattern portion D2 are represented by a mesh. Further, the density of the pattern D is expressed by the difference in the density of the mesh.

  The plurality of first pattern portions D1 are spaced apart from each other in the two orthogonal directions of the back surface 11B of the substrate 11 (up and down direction and left and right direction in FIG. 3) with the closest first pattern portion D1. It is formed so as not to be adjacent. The plurality of second pattern portions D2 are formed between the adjacent first pattern portions D1. With this formation, the plurality of second pattern portions D2 are not adjacent to the nearest second pattern portion D2 at regular intervals in the two directions (vertical direction and horizontal direction in FIG. 3), respectively. It is located at a location adjacent to the nearby first pattern portion D1.

  The decoration may be performed by a geometric pattern other than a carbon woven pattern, or a pattern other than a geometric pattern, such as a wood grain pattern, a stone pattern, a grain pattern, a metallic pattern, an abstract pattern, etc. Good.

  FIG. 1 shows a cross-sectional structure of the decorative sheet 10. As shown in FIG. 1, the decorative sheet 10 includes a base material 11, a plurality of transparent printing layers 12, and a colored printing layer 13. Next, each part of the decorative sheet 10 will be described.

<Substrate 11>
FIG. 2 shows an X portion in FIG. 1 in an enlarged manner. As shown in FIG.1 and FIG.2, the base material 11 is formed in the transparent sheet form which has thickness T1 of 0.2 mm-0.5 mm with resin. Examples of the resin that forms the base material 11 include polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, acrylic resins, vinyl chloride resins, and polycarbonate resins.

  If a resin having a large refractive index is used as the resin, it can be expected to express a pattern D having a more excellent stereoscopic effect. From this point of view, in the present embodiment, the base material 11 is formed of a polycarbonate resin that is a resin having a large refractive index, thereby obtaining a pattern D having a three-dimensional effect more effectively.

<Transparent printing layer 12>
Each of the transparent printing layers 12 is transparent by printing a photosensitive resin in a plurality of spaced locations on the back surface 11B of the base material 11 and curing in response to ultraviolet rays (ultraviolet curing type). Is formed. Here, each transparent printed layer 12 is colorless and transparent at locations that are spaced at regular intervals in the two directions orthogonal to each other on the back surface 11B of the substrate 11 (the horizontal direction in FIG. 1 and the direction orthogonal to the paper surface). It is formed in a substantially square shape (see FIG. 3).

  Each transparent printing layer 12 is formed to a thickness T2 of 20 μm or more. The thickness T2 is more preferably 30 μm or more. When the thickness T2 is less than 20 μm, the depth of the pattern D is difficult to appear, and the appearance of the three-dimensional effect is insufficient. Although the maximum value of the thickness T2 of each transparent printing layer 12 depends on the distance (pitch) from the adjacent transparent printing layer 12, it is generally preferably 70 μm. However, when the interval (pitch) between the adjacent transparent printing layers 12 is wide, the maximum value of the thickness T2 may be 100 μm.

In addition, thickness T2 (20 micrometers-100 micrometers) of each said transparent printing layer 12 is thicker than the thickness of the transparent printing layer in case the metallic printing layer demonstrated in the term of background art is formed.
<Colored printing layer 13>
The colored printing layer 13 is formed by printing using a colored ink containing a low-solubility solvent (a weak ability to dissolve the base material 11 and the transparent printing layer 12) and a color pigment. In the present embodiment, an alcohol solvent, more specifically, a black colored ink containing a polyhydric alcohol solvent is used as a low-solubility solvent for printing. In the general printing, the colored ink has lower solubility than the colored ink containing a solvent for enhancing the adhesion to the base material 11 and the transparent printing layer 12, and the base material 11 and the transparent printing. Adherence to the layer 12 is minimal or close to that necessary. Here, the necessary minimum adhesion means that the colored printed layer 13 is not peeled off from the substrate 11 and the transparent printed layer 12 when the decorative sheet 10 is deformed along the surface shape of the automobile interior product. It means the adhesion required to make it.

  The colored printing layer 13 is formed as a single layer with a thickness T3 of 2 μm to 20 μm in all the transparent printing layers 12 and the back surface 11B of the substrate 11 where each transparent printing layer 12 is not formed. ing. The thickness T3 is more preferably 3 μm to 10 μm, and further preferably 3 μm to 5 μm. If the color print layer 13 has a thickness T3 of less than 2 μm, it is difficult to recognize the color (black). When the thickness T3 exceeds 20 μm, the volatilization time of the low-solubility solvent at the time of forming the colored print layer 13 becomes long. Since the low-solubility solvent has many actions to dissolve the base material 11 and the transparent printing layer 12, when the volatilization time becomes long, the base material 11 and the transparent printing layer 12 with the low-solubility solvent have a long time. Dissolution is not negligible.

  The colored printing layer 13 constitutes the pattern D together with the transparent printing layer 12. More specifically, in the colored print layer 13, the portion directly formed on the back surface 11 </ b> B of the base material 11 constitutes the second pattern portion D <b> 2 of the pattern D. Moreover, the location formed in the back side of each transparent printing layer 12 among the colored printing layers 13 and the transparent printing layer 12 constitute a first pattern portion D1 of the pattern D.

The decorative sheet 10 is manufactured through the following forming steps.
<Formation process of transparent printing layer 12>
In this step, the transparent printing layer 12 is formed by printing at a plurality of spaced apart locations on the back surface 11B of the transparent base material 11 formed in a sheet shape from a polycarbonate resin.

  In forming the transparent printing layer 12, an ultraviolet curable ink is applied to the back surface 11 </ b> B of the substrate 11 to a thickness of 20 μm to 100 μm. Subsequently, the applied ultraviolet curable ink is irradiated with ultraviolet rays from an ultraviolet irradiation device (not shown). As the ultraviolet irradiation device, a known ultraviolet curing device including a light source lamp such as a high-pressure mercury lamp or a metal halide lamp and an irradiator (lamp house) can be used.

  Then, the ultraviolet curable ink reacts to the ultraviolet rays irradiated as described above and cures, and the transparent printing layer 12 having a thickness T2 of 20 μm to 100 μm is formed at a plurality of locations on the back surface 11B of the substrate 11. The

  Here, if each transparent printing layer 12 is formed by printing using solvent-based ink, the solvent is volatilized after application of the solvent-based ink, whereby the transparent printing layer 12 is obtained. The thickness T2 of the transparent printing layer 12 after volatilization is smaller than the thickness at the time of application. Moreover, the thickness per layer of the transparent printing layer that can be formed is about 10 μm at the maximum. Therefore, in order to form the transparent printing layer 12 having a thickness T2 of 20 μm or more by printing using solvent-based ink, it is necessary to overprint the solvent-type ink a plurality of times.

  However, not limited to solvent-based inks, generally, when a plurality of transparent printing layers 12 are formed by ink overprinting, the previously formed layers become cloudy. The degree of white turbidity in the entire transparent printing layer 12 increases as the number of overcoating of the transparent printing layer 12 increases. This white turbidity impairs the transparency of the entire transparent printing layer 12, and consequently the depth of the pattern D (first pattern portion D1).

  In this regard, in the present embodiment in which the transparent printing layer 12 is formed by printing using an ultraviolet curable ink, the ultraviolet curable ink applied to the substrate 11 is cured by being irradiated with ultraviolet rays, The transparent printing layer 12 is formed. Since the ultraviolet curable ink does not contain a solvent, unlike the solvent-type ink, the solvent does not volatilize, and when cured, the thickness at the time of application is maintained.

  Therefore, the transparent printing layer 12 having a thickness T2 of 20 μm to 100 μm can be obtained even if the UV curable ink is not overprinted many times, that is, even if printing is performed once or printing is performed a small number of times.

<Formation process of colored printing layer 13>
In this step, a colored ink containing a low-solubility solvent and a coloring pigment is used, and is applied to the back surface 11B of the base material 11 with all the transparent printing layers 12 covered from the back side.

  Here, when the thickness T2 of each of the transparent printing layers 12 exceeds 100 μm, the space between the adjacent transparent printing layers 12 becomes deep, and when the colored printing layer 13 is printed, the colored ink is placed between the adjacent transparent printing layers 12. It becomes difficult to apply it to the back surface 11 </ b> B of the base material 11. In this regard, in the present embodiment in which each transparent printing layer 12 is formed to a thickness T2 of 100 μm or less, the colored ink easily enters between adjacent transparent printing layers 12 and is satisfactorily applied to the back surface 11B of the substrate 11. .

  In addition, the colored ink containing a low-solubility solvent used for printing for forming the colored printing layer 13 is a solvent for improving the adhesion of the colored printing layer 13 to the substrate 11 and the transparent printing layer 12. Compared with the colored ink contained, the force which melt | dissolves the base material 11 and the transparent printing layer 12 is weak. Therefore, the base material 11 and the transparent printing layer 12 are not easily dissolved as compared with the case where the colored printing layer 13 is formed with colored ink containing a solvent for improving the adhesion. The outer edge portion 12A of each transparent printing layer 12 is also difficult to dissolve. Therefore, on the back surface 11 </ b> B of the base material 11, the boundary line between the portion where the transparent printing layer 12 is formed and the portion where it is not formed remains without disappearing.

  By the way, the colored ink containing the low-solubility solvent dissolves the substrate 11 and the transparent printing layer 12 as compared with the colored ink containing the solvent for improving the adhesion of the colored printing layer 13 as described above. The power to do is weak. Nonetheless, as long as the action of trying to dissolve the base material 11 and the transparent printing layer 12 is not small, the base material 11 and the transparent printing layer 12 are dissolved when a long time is required for volatilization of the low-solubility solvent. .

  Therefore, in this embodiment, after the colored ink containing the low-solubility solvent is applied to the back surface 11B of the substrate 11 and the transparent printing layer 12, hot air is blown against the applied colored ink. This forcibly volatilizes the low-solubility solvent in the colored ink. Therefore, the volatilization time of the solvent is shorter than when waiting for the low-solubility solvent to volatilize at room temperature. Along with this, the time for the low-solubility solvent to dissolve the substrate 11 and the transparent printing layer 12 is shortened.

  The low-solubility solvent in the colored ink is volatilized, so that the transparent printing layer 12 having a clear outer edge 12A is hardly dissolved by the low-solubility solvent at a plurality of locations on the back surface 11B of the substrate 11. Remains. Moreover, the colored printing layer 13 which coat | covers all the remaining transparent printing layers 12 as mentioned above on the back surface 11B of the base material 11, and has the thickness T3 of 2 micrometers-20 micrometers is formed.

  The thickness T3 of the colored printing layer 13 formed in this way is as thin as 20 μm at the maximum. Therefore, also in this respect, the volatilization time of the low-solubility solvent is shortened, and dissolution of the base material 11 and the transparent printing layer 12 by the solvent is suppressed to an allowable range.

Next, the effect | action of the decorating sheet 10 of this embodiment manufactured as mentioned above is demonstrated.
In the decorative sheet 10 of this embodiment, the transparent printing layer 12 is a part of the back surface 11B of the transparent substrate 11, more specifically, a plurality of locations, and more specifically, the back surface 11B of the substrate 11 in two directions orthogonal to each other. Are positioned at regular intervals. Further, the colored printing layer 13 is located on the back side of the substrate 11 in a state where all the transparent printing layers 12 are covered. Therefore, the colored printing layer 13 is located on the base material 11 in a state where the transparent printing layer 12 is not formed on the back surface 11B of the base material 11 in a state of being in direct contact with the back surface 11B. On the other hand, the colored printing layer 13 is located on the base material 11 through each transparent printing layer 12 in a plurality of places where the transparent printing layer 12 is formed.

  Therefore, when the decorative sheet 10 is viewed from the surface 11 </ b> A side of the base material 11, since the base material 11 is transparent, the one located behind the base material 11 can be seen through the base material 11. Under the present circumstances, the base material 11 exhibits the function to give a glossy feeling, and the function to give a transparent feeling.

  At a location where the transparent print layer 12 is not formed on the back surface 11B of the base material 11, the colored print layer 13 can be seen as the second pattern portion D2 through the base material 11. On the other hand, at the place where the transparent printing layer 12 is formed, the colored printing layer 13 can be seen through the base material 11 and the transparent printing layer 12 having a thickness T2 of 20 μm or more. That is, the transparent printing layer 12 and the colored printing layer 13 are visible as the first pattern portion D1 through the base material 11.

  And as above-mentioned, in the back surface 11B of the base material 11, the boundary part (outer edge part 12A of each transparent printing layer 12) of the location in which each transparent printing layer 12 is formed, and the location in which it is not formed, It remains linear and clear.

Further, the colored printing layer 13 is formed to a thickness T3 of 2 μm or more, and the color of the colored printing layer 13 can be recognized.
Therefore, the colored printing layer 13 can be seen at the back of the portion where the transparent printing layer 12 is formed by the thickness T2 of the transparent printing layer 12 than the portion where the transparent printing layer 12 is not formed. As a result, the pattern D composed of the first pattern portion D1 and the second pattern portion D2 looks three-dimensional with a sense of depth.

According to the embodiment described in detail above, the following effects can be obtained.
(1) A transparent printing layer (transparent printing layer 12) having a thickness T2 of 20 μm or more is formed by printing on a part of the back surface 11B of the sheet-like transparent substrate 11 formed of resin. A colored printing layer 13 made of colored ink containing a low-solubility solvent is formed by printing on the back surface 11B of the substrate 11 in a state where the transparent printing layer 12 is coated. The transparent printing layer 12 and the colored printing layer 13 constitute a pattern D composed of the first pattern portion D1 and the second pattern portion D2.

Therefore, without forming a metallic print layer by printing using metallic ink,
The pattern D constituted by the transparent printing layer 12 and the colored printing layer 13 can be seen three-dimensionally from the surface 11A side of the substrate 11.

(2) At the time of forming the transparent printing layer 12, the ultraviolet curable ink is applied to the back surface 11 </ b> B of the substrate 11 and then irradiated with ultraviolet rays to cure the ink.
Therefore, the transparent printing layer 12 having a thickness T2 of 20 μm or more can be formed by overprinting many times, that is, by one printing or a small number of printings. As a result, white turbidity caused by overprinting of ink is hardly generated, and the depth feeling of the pattern D can be obtained satisfactorily.

(3) The transparent printing layer 12 is formed at a plurality of locations separated from each other on the back surface 11B of the substrate 11. And the thickness T2 of each transparent printing layer 12 is 100 micrometers or less.
Therefore, when forming the colored printing layer 13, the colored ink can easily enter between the adjacent transparent printing layers 12 and can be satisfactorily applied to the back surface 11 </ b> B of the substrate 11.

(4) The colored printing layer 13 is formed to a thickness T3 of 2 μm or more.
Therefore, the colored print layer 13 that can recognize the color can be formed on the back surface 11 </ b> B of the substrate 11 and the transparent print layer 12.

(5) The colored printing layer 13 is formed to a thickness T3 of 20 μm or less.
Therefore, the volatilization time of the low-solubility solvent can be shortened, and dissolution of the base material 11 and the transparent printing layer 12 by the solvent can be suppressed within an allowable range.

(6) As the colored ink for forming the colored print layer 13, black ink, which is the color that hardly reflects light, is used.
Therefore, the effect of the above (1) can be obtained more effectively, such that the pattern D can be viewed three-dimensionally as compared with the case where other color inks are used as colored inks.

  (7) When the colored printing layer 13 is formed, a colored ink containing a low-solubility solvent is applied to the back surface 11B of the substrate 11 and each transparent printing layer 12 and then sprayed with hot air to reduce the solubility. The solvent is forcibly volatilized.

  Therefore, the volatilization time of the low-solubility solvent in the colored ink can be shortened, and the time during which the action of dissolving these on the base material 11 and the transparent printing layer 12 can be shortened. As a result, the phenomenon in which the base material 11 and the transparent printing layer 12 are dissolved by a low-solubility solvent can be further suppressed.

Note that the present invention can be embodied in another embodiment described below.
-The colored printing layer 13 may be comprised by the single layer, and may be comprised by the several layer containing a protective layer. In the latter case, the first printed layer of the colored print layer 13 is formed to a thickness T3 of 2 μm to 20 μm, so that the effects (4) and (5) can be obtained.

-In the said embodiment, the transparency of the base material 11 and the transparent printing layer 12 is not restricted to colorless and transparent, but includes what is transparent but has a color in a broad sense.
-A transparent resin layer may be provided on the surface of the substrate 11 as a surface protective layer.

The colored printing layer 13 may be formed by printing using colored inks other than black.
-This invention is applicable not only to the interior goods for motor vehicles but the decoration sheet used in order to decorate the surface of the exterior goods for motor vehicles.

  Moreover, this invention is applicable also to the decoration sheet | seat used when decorating the surface of fields other than a motor vehicle, for example, household appliance parts, miscellaneous goods, daily necessities, etc.

  DESCRIPTION OF SYMBOLS 10 ... Decorating sheet, 11 ... Base material, 11B ... Back surface, 12 ... Transparent printing layer, 13 ... Colored printing layer, D ... Pattern, T1, T2, T3 ... Thickness.

Claims (7)

A transparent substrate formed into a sheet shape from any of polyolefin resin, polyester resin, acrylic resin, vinyl chloride resin, and polycarbonate resin ;
A transparent printing layer formed to a thickness of 20 μm or more by printing using an ultraviolet curable ink on a part of the back surface of the substrate;
The transparent printing is formed on the back surface of the base material in a state of covering the transparent printing layer by printing using a colored ink containing an alcohol solvent having a weak ability to dissolve the base material and the transparent printing layer. A decorative sheet comprising a colored printing layer that forms a pattern together with the layer. The transparent printing layer, the decorative sheet according to claim 1 which is formed in the thickness of not more than 100μm at a plurality of positions spaced from each other on the back surface of the substrate. The decorative sheet according to claim 1 or 2 , wherein the colored print layer is formed to a thickness of 2 µm to 20 µm. The decorative sheet according to any one of claims 1 to 3 , wherein the colored print layer is formed by printing using black ink. A transparent printed layer having a thickness of 20 μm or more is UV-cured on a part of the back surface of a transparent substrate formed into a sheet shape from any of polyolefin resin, polyester resin, acrylic resin, vinyl chloride resin, and polycarbonate resin. In the state where the transparent printing layer is coated, using a colored ink containing an alcohol solvent that has a weak ability to dissolve the substrate and the transparent printing layer. A method for producing a decorative sheet, wherein a colored printing layer is formed by printing to form a pattern comprising the transparent printing layer and the colored printing layer on the back surface of the substrate. In the formation of the transparent printing layer, the ultraviolet-curable ink is applied to the back surface of the substrate and then irradiated with ultraviolet rays to cure the ultraviolet-curable ink according to claim 5 . Production method. In forming the colored printing layer, the alcoholic solvent is forcibly volatilized by spraying hot air after applying the colored ink containing the alcoholic solvent to the back surface of the substrate and the transparent printing layer. The manufacturing method of the decorating sheet of Claim 5 or 6 to be made.