JP2022159329A - decorative material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a decorative material having an unevenness and a tactile feeling completely synchronized with a picture pattern, the decorative material that can be manufactured without using an expensive gravure plate.

SOLUTION: A decorative material 1 includes, on a substrate 2, an ink jet printing picture pattern layer 3 with an ultraviolet-curable ink. In the decorative material, a maximum height (Rz) stipulated by JIS B0601:2001 is 8 μm or higher, and a portion with a thinner hue and a portion with a deeper hue are respectively present. The amount of ink at the portion with a thinner hue is smaller and the amount of ink at the portion with a deeper hue is larger.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2023,JPO&INPIT

Description

TECHNICAL FIELD The present invention relates to a decorative material used for the interior of houses, buildings, vehicles, elevators, etc., and the exterior of equipment, and more particularly to a decorative material having unevenness on the surface that perfectly matches a pattern.

As decorative materials, various designs are applied to various substrates by using a printing method. Paper-based paper is called decorative paper, and after forming a pattern mainly by gravure printing, it is impregnated with thermosetting resin or coated with a protective layer on the surface to be processed into various decorative boards. be done.

A decorative sheet using a synthetic resin sheet as a base material is laminated on the surface of a wooden base material and used as an interior building material or a building material, or laminated on the surface of a metal plate or metal mold material and used as a metal building material. are doing In addition, it can be used for on-site applications such as renovation of elevator interiors by applying adhesive processing to the back surface.

In evaluating the design of the decorative material, not only the design of the printed pattern, but also the luster, unevenness and texture of the surface are important factors. Above all, it can be said that how to produce a decorative material having unevenness and a tactile feel that are in harmony with the pattern is an eternal problem for the decorative material maker.

The embossed decorative sheet described in Patent Document 1 is obtained by laminating a printed pattern layer and a transparent protective sheet on a base sheet, and embossing the protective sheet. This embossed decorative sheet is produced by extruding a melted transparent protective layer from an extruder and laminating it to a printed base sheet and simultaneously subjecting it to cold pressure embossing. is technically difficult.

The embossed decorative sheet described in Patent Document 2 uses a paper-based base material with an elongation of 2% or less as the base material, thereby reducing deviation when embossing the top coat layer, and synchronizing with the pattern. A decorative sheet having an embossed pattern is realized.

The embossed-synchronized decorative sheet described in Patent Document 2 is not a synchronized embossed decorative sheet in the original sense, because the pattern is made into a wood grain pattern so that slight misalignment of the embossing is not noticeable.

On the other hand, as a printing method for decorative sheets, the gravure printing method has been generally used conventionally. unsuitable. Therefore, in the trial production stage, when production has not yet been determined, proof printing using small-sized flat plates or plates with short face lengths has often been used.

The embossed decorative sheet described in Patent Document 3 is proposed to solve this problem, and is prepared by embossing the surface of a transparent thermoplastic resin film in advance and applying adhesive processing to the back surface. Then, the transparent thermoplastic resin film is attached to the pattern surface of the synthetic resin substrate film on which the pattern is printed by the inkjet printing method.

According to this method, it is sufficiently possible to make a prototype of a practical size such as fittings, but it is completely different from the viewpoint of synchronized embossing.

JP-A-11-254631 JP-A-8-267696 JP-A-2007-90797

The problem to be solved by the present invention is to propose a decorative material that can be produced without using an expensive gravure plate, and that has unevenness and a tactile feel that are in perfect harmony with the design.

As a means for solving the above problems, the invention according to claim 1 has an inkjet printed pattern layer with ultraviolet curable ink on a substrate, and has a maximum height (Rz ) is 8 μm or more, and there are light color tone portions and dark color tone portions, and the light color tone portion has a small amount of ink and the dark color tone portion has a large amount of ink.

Since the decorative material according to the present invention has a pattern layer made of ultraviolet curable ink having a high solid content, it has unevenness on the surface that is in perfect harmony with the pattern.

Further, according to the invention of claim 2, the ink-jet printed pattern layer is composed of ink layers of at least four colors of yellow, magenta, cyan and black. is.

Further, the invention according to claim 3 is the decorative material according to claim 2, wherein the thicknesses of the ink layers of the respective colors are not equal.

Further, the invention according to claim 4 is the decorative material according to any one of claims 1 to 3, characterized by having a surface protective layer on the outermost surface.

The decorative material according to the present invention has an inkjet-printed pattern layer with a UV-curable ink having a high solid content on a substrate, and has a maximum height (Rz) of 8 μm or more as defined in JIS B0601:2001. The surface has unevenness that is in perfect harmony with the pattern, and the design is extremely high.

Since light-colored portions (highlight portions) have a small amount of ink, and dark-colored portions (shadow portions) have a large amount of ink, the decorative material can have an uneven feel that matches the shades of the pattern.

As in the invention described in claim 2, when the inkjet printed pattern layer is composed of four ink layers of yellow, magenta, cyan, and black, unlike gravure printing using special colors, the trouble of toning is required. Suitable for high-mix low-volume production.

In addition, by making the thickness of the ink layer of each color different as in the third aspect of the invention, the change in unevenness is increased, and the design property is further improved.

Further, when a surface protective layer is provided on the outermost surface as in the invention of claim 4, the durability of the decorative material is improved.

FIG. 1 is a schematic cross-sectional view schematically showing the cross-sectional structure of a basic embodiment of the decorative material according to the present invention. FIG. 2 is a schematic cross-sectional view schematically showing the cross-sectional structure of an embodiment of the decorative material according to the present invention, which is obtained by adding a surface protective layer to the structure of FIG. FIG. 3 is a schematic cross-sectional view schematically showing the cross-sectional structure of an embodiment of the decorative material according to the present invention, in which a base layer is added to the structure of FIG. FIG. 4 is a schematic cross-sectional view schematically showing a cross-sectional structure of an embodiment of the decorative material according to the present invention, showing a state in which heights are different between highlight portions and shadow portions.

BEST MODE FOR CARRYING OUT THE INVENTION The decorative material according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic cross-sectional view schematically showing the cross-sectional structure of a basic embodiment of the decorative material according to the present invention.

The decorative material according to the present invention is characterized by having an inkjet-printed pattern layer 3 made of ultraviolet curable ink on a substrate 2 and having a maximum height (Rz) of 8 μm or more as defined in JIS B 0601:2001. It is a cosmetic material that

As the base material 2, there are no particular restrictions, and various materials that are generally used as base materials for decorative materials can be used. However, materials that absorb ink, such as titanium paper, are preferable because they reduce unevenness. do not have. Materials such as synthetic resin sheets that are difficult to absorb are suitable. However, even when paper is used, it can be used if it is treated to reduce ink absorbency.

As the synthetic resin sheet, a colored sheet obtained by adding an organic pigment, an inorganic pigment, a filler, an additive, etc. to a base resin such as polyolefin resin, vinyl chloride resin, polyethylene terephthalate resin, ABS resin, acrylic resin, etc. and kneading them is suitable. used for In recent years, vinyl chloride resins, which generate hydrogen chloride gas when incinerated, have been disliked, and polyolefin resins such as polyethylene resins and polypropylene resins, which are well-balanced in terms of cost and performance, have been widely used.

As the ink for inkjet printing, a known ultraviolet curable inkjet ink having a high solid content can be used, but from the gist of the present invention, an ink imparted with thixotropic properties is more preferable so that ink droplets do not drip. . In addition, it is desirable to immediately irradiate ultraviolet rays to cure the ink layer before the ink layer is leveled after printing.

The inkjet printing pattern layer 3 is made up of four colors, namely, a yellow ink layer 4, a magenta ink layer 5, a cyan ink layer 6, and a black ink layer 7, so that a gravure printing method using pre-mixed special colors is possible. Unlike other methods, it does not take time to match colors, so it can be used for high-mix low-volume production.

Further, as shown in FIG. 1, by adjusting the density of the ink of each color to make the height of the ink droplets of each color different, the unevenness of the pattern layer becomes conspicuous and the design is further improved.

As an inkjet printer, it is desirable to use a continuous inkjet printer equipped with a base material unwinding section and a product winding section, and with an ultraviolet irradiation device immediately after the printing section. If available, a sheet-fed printing press with a fixed bed is also possible.

FIG. 2 is a schematic cross-sectional view schematically showing the cross-sectional structure of an embodiment of the decorative material 1 according to the present invention, in which a surface protective layer 8 is added to the structure of FIG. The surface protective layer 8 is provided for the purpose of protecting the inkjet-printed pattern layer 3, and can improve wear resistance, scratch resistance, light resistance, etc. of the surface of the decorative material 1. FIG.

As the surface protective layer 8, a known transparent resin varnish such as a thermosetting acrylic urethane resin varnish, an ultraviolet curable resin varnish, an electron beam curable resin varnish, or the like can be used. If the surface protective layer 8 is applied too thickly, it fills the unevenness of the ink-jet printed pattern layer.

To the surface protective layer 8, for example, an anti-wear agent such as silica or alumina is added for the purpose of improving abrasion resistance, an ultraviolet absorber or a light stabilizer is added for the purpose of improving light resistance, or a glossiness of the surface is added. A matting agent can be added for the purpose of adjusting the

A base layer 9 may be provided on the surface of the base material 2 as in the example shown in FIG. The base layer 9 improves the adhesiveness of the inkjet ink to the base material 2, functions as a base colored layer, and suppresses absorption when the base material is highly absorbent such as paper. It is possible to have

In the example shown in FIG. 4, the difference in the amount of ink between the highlight portion 11 and the shadow portion 12 is used to develop unevenness. By doing so, unevenness corresponding to the density of the pattern is expressed, so that a high degree of designability in harmony with the pattern is exhibited. The cosmetic material according to the present invention will be described in more detail below based on examples.

<Example 1>
A colored polyethylene film (FZ manufactured by Riken Technos) is used as the base material 2, and an ultraviolet curable inkjet ink (manufactured by Ricoh Co., Ltd.) is used as the inkjet ink. was irradiated and cured. A thermosetting polyfunctional acrylic urethane resin (manufactured by DIC Graphics Co., Ltd.) to which silica was added was applied as a surface protective layer 8 thereon so as to have a thickness of 1 μm after drying. The surface roughness Ra (arithmetic mean roughness) and Rz (maximum height) of the decorative material thus obtained were measured, and the tactile sensation when actually touched was evaluated. As for the evaluation of the tactile sensation, ◯ was given when the tactile sensation was felt, and X was given when the tactile sensation was not felt.

<Example 2>
A decorative material was prepared and evaluated in the same manner as in Example 1, except that a dark wood grain pattern was printed.

<Comparative Example 1>
A decorative material was prepared and evaluated in the same manner as in Example 1, except that paper was used as the base material and a wood grain pattern was gravure-printed using gravure ink (Lamister (registered trademark) manufactured by Toyo Ink Co., Ltd.).

<Comparative Example 2>
A decorative material was prepared and evaluated in the same manner as in Examples except that paper was used as the base material and water-based ink (manufactured by Toyo Ink Co., Ltd.) was used as the inkjet ink.

<Comparative Example 3>
A decorative material was prepared and evaluated in the same manner as in Example 1, except that a light wood grain pattern was printed. Table 1 shows the evaluation results of each of the above samples.

As can be seen from the results in Table 1, the decorative material according to the present invention has unevenness that is in perfect harmony with the pattern, is a decorative material that has a tactile sensation when touched by hand, and is excellent in terms of design. be.

DESCRIPTION OF SYMBOLS 1... Decorative material 2... Base material 3... Inkjet-printed pattern layer 4... Yellow ink layer 5... Magenta ink layer 6... Cyan ink layer 7... Black ink layer 8. ... Surface protective layer 9 ... Base layer 11 ... Highlight part 12 ... Shadow part

Claims (4)

The base material has an inkjet-printed pattern layer using an ultraviolet curable ink, has a maximum height (Rz) of 8 μm or more as defined in JIS B0601:2001, has a light color tone portion and a dark color tone portion, and has a low color tone. A decorative material characterized by having a small amount of ink in a light portion and a large amount of ink in a dark portion. 2. The decorative material according to claim 1, wherein the ink-jet printed pattern layer comprises at least four color ink layers of yellow, magenta, cyan and black. 3. The decorative material according to claim 2, wherein thicknesses of the ink layers of the respective colors are unequal. The decorative material according to any one of claims 1 to 3, characterized by having a surface protective layer on the outermost surface.

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