JP2018030265A - Decorative sheet and decorative laminate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a decorative sheet having a configuration of forming an anchor layer on a print original roll, forming a printed layer by inkjet printing thereon, and further forming a layer such as a clear layer thereon, the decorative sheet eliminating a need of material design of the anchor layer considering adhesion between the layer and the anchor layer, and between the printed layer and the anchor layer, and unlikely to cause unevenness in the printed layer and the anchor layer to decrease designability, even if an ultraviolet ray-curable inkjet ink is used.SOLUTION: A decorative sheet 1 includes, on a print original roll 2, an anchor layer 3 configured to enhance adhesion of an inkjet ink, a printed layer 4 formed by inkjet printing, and a clear layer 5 being a transparent protective layer, respectively disposed in this order. The printed layer includes a pattern printed layer 4b with a pattern printed by a colored inkjet ink, and a transparent printed layer 4a with a transparent inkjet ink printed on a portion other than the pattern printed layer.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a decorative sheet and a decorative board using the decorative sheet. Furthermore, the present invention relates to a decorative sheet and a decorative board suitable for a variety of small lots.

  Conventionally, gravure printing has been used as a technique for printing a pattern on a decorative sheet for producing a decorative board. Gravure printing can create a decorative sheet design with good design by excellent gradation expression. However, for example, in the case of a full-color pattern, it is necessary to prepare at least four gravure printing plates (cyan, magenta, yellow, black), the plate cost becomes high, and it is difficult to deal with small-quantity, multi-product production. In addition, there is a problem that it is not possible to cope with a size of 2 m or more.

  As a technique for solving such a problem, for example, Patent Document 1 discloses a technique using inkjet printing as a technique for forming a pattern. Inkjet printing is plateless printing and is a technology that can handle a wide variety of small quantities.

  However, when a polyolefin film or a polyester film is used as a printing raw material, since the adhesion between the printing layer and the printing raw material is low, the printing layer may be peeled off from the printing raw material and the design may be deteriorated. is there. As a solution, it is conceivable to form an anchor layer on the surface of the printing original fabric. However, when a clear layer is provided as a protective layer on a print layer formed of an ultraviolet curable ink jet ink, adhesion between the clear layer and the print layer and between the clear layer and the anchor layer must be ensured at the same time. This is because the printed layer does not cover the entire anchor layer, and the anchor layer is exposed in a portion where the printed layer is not formed.

  Therefore, when the clear layer is formed on the print layer, the clear layer is in contact with both the print layer and the anchor layer at the same time, so that the adhesion between the clear layer and either the print layer or the anchor layer is insufficient. In this case, the clear layer may be peeled off and the designability may be reduced. Therefore, it is necessary to design the anchor layer in consideration of the adhesion between the clear layer and the anchor layer, and the printed layer and the anchor layer. Also, when UV curable inkjet ink is used, the printing layer rises on the anchor layer due to its characteristics, and when a clear layer is provided, the printing layer and the anchor layer have irregularities, resulting in poor design. There is a risk of doing.

JP 2001-71447 A

  In view of the above circumstances, the present invention provides a decorative sheet having a structure in which an anchor layer is formed on a printing original fabric, a printing layer is formed thereon by inkjet printing, and a layer such as a clear layer is further formed thereon. It is an object of the present invention to provide a decorative sheet that does not require material design of the anchor layer in consideration of adhesion between the layer and the anchor layer and between the printed layer and the anchor layer.

  It is another object of the present invention to provide a decorative sheet that does not have a risk of design deterioration due to unevenness of the printed layer and the anchor layer even when an ultraviolet curable inkjet ink is used.

As means for solving the above-mentioned problems, the invention according to claim 1 of the present invention is an anchor layer for improving the adhesion of the inkjet ink, a printing layer by inkjet printing, and a transparent protective layer on the printing raw fabric. In the decorative sheet provided with the clear layer in this order,
The decorative layer is characterized in that the printing layer is composed of a pattern printing layer in which a pattern is printed with a colored inkjet ink and a transparent printing layer in which a transparent inkjet ink is printed on a portion other than the pattern printing layer.

  The invention according to claim 2 is the decorative sheet according to claim 1, wherein the printing material is either a polyolefin resin or a polyester resin.

  The invention according to claim 3 is the decorative sheet according to claim 1 or 2, wherein the colored and transparent ink-jet ink is an ultraviolet curable ink.

  The invention according to claim 4 is characterized in that the anchor layer contains any one or more of a polyester resin, a polycarbonate resin and an acrylic resin. It is a decorative sheet of description.

  The invention according to claim 5 is the decorative sheet according to any one of claims 1 to 5, wherein the clear layer is a resin layer crosslinked and cured by ionizing radiation irradiation.

  According to the decorative sheet of the present invention, the printed layer printed on the anchor layer includes a printed layer made of colored inkjet ink, and a transparent inkjet ink obtained by removing only the colored components from the colored inkjet ink in a portion without the colored ink. Since the printing layer is formed, the unevenness of the printing layer is alleviated, so that there is no possibility that the design property is lowered.

  In addition, since the anchor layer is entirely covered by the printing layer, the layer formed on the printing layer is a layer formed on the printing layer only by designing the material considering only the adhesion to the printing layer. There is no possibility of peeling off and there is no possibility of deteriorating the design.

The schematic sectional drawing which illustrated the layer composition of the decorative sheet of the present invention. The schematic sectional drawing which illustrated the layer composition of the decorative board using the decorative sheet of the present invention.

<Coating sheet>
FIG. 1 is a schematic cross-sectional view showing an example of the layer structure of the decorative sheet 1 of the present invention.
The decorative sheet 1 of the present invention includes an anchor layer 3 that enhances the adhesion of inkjet ink, a printing layer 4 by inkjet printing, and a clear layer 5 that is a transparent protective layer, in this order, on a printing raw fabric 2. This is a decorative sheet 1.
The printing layer 4 includes a pattern printing layer 4b in which a pattern is printed with colored inkjet ink, and a transparent printing layer 4a in which a transparent inkjet ink is printed on a portion other than the pattern printing layer 4b.

  Moreover, as for the decorative sheet 1 of this invention, the printing raw fabric 2 may be either polyolefin resin or polyester resin.

  In the decorative sheet 1 of the present invention, the colored inkjet ink or the transparent inkjet ink may be an ultraviolet curable ink.

  In the decorative sheet 1 of the present invention, the anchor layer 3 may contain any one or more of a polyester resin, a polycarbonate resin, and an acrylic resin.

  Moreover, the decorative sheet 1 of the present invention may be a resin layer in which the clear layer 5 is crosslinked and cured by irradiation with ionizing radiation.

(Original printing)
As the printing raw fabric 2, a sheet-like resin film can be preferably used. Examples of the resin include polyolefin resins and polyester resins.

(Anchor layer)
The anchor layer 3 is a layer for fixing an inkjet ink printed by inkjet printing. The anchor layer 3 is composed of a layer containing silica, for example, in which silica particles are dispersed in a polyester resin.
As an example of using a polyester-based resin, for example, 18 parts by mass of a curing agent is added to 100 parts by mass of a polyester-based resin, and a volume-based average particle diameter by a dynamic light scattering method (hereinafter, particularly, refused). Otherwise, the average particle diameter is preferably used). A material to which 2.0 μm of silica is added in an amount of 1.5% by mass to 5.0% by mass can be suitably used.

In this case, a two-component curable polyester coating solution (UC Clear W-320 (manufactured by DIC Corporation)) is used as the main agent, and urethane curing agents (WA, (DIC) are used as the curing agent. Can be used).
The curing agent is not limited to the case of containing 18 parts by mass with respect to 100 parts by mass of the main agent, but may be an amount that can achieve curing of the polyester resin, and is around 18 parts by mass. It doesn't matter.
Similarly, silica does not limit the average particle diameter to 2.0 μm, and may be, for example, 1.8 μm or more and 2.2 μm or less, as long as the average particle diameter can be adjusted to a desired gloss range.

  The gloss value of the decorative sheet 1 can be adjusted by adjusting the concentration of silica added to the polyester resin. Specifically, the gloss value of the surface of the decorative sheet 1 is in the range of 5 to 20 by adding silica having an average particle size of 2.0 in the range of 1.5 to 5.0% by mass. It can be adjusted. In addition, you may add surfactant, an antifoamer, a thickener, a water-proofing agent, etc. to the anchor layer 3 as needed.

(Print layer)
The printing layer 4 includes a pattern printing layer 4b for imparting design properties and a transparent printing layer 4a in which a transparent inkjet ink is printed on the entire area other than the pattern printing layer 4b in order to improve the smoothness of the printing layer 4.

  The pattern print layer 4 b is a print layer in which a pattern for imparting design properties with a colored inkjet ink is printed on the surface of the anchor layer 3. As the colored inkjet ink, for example, an ultraviolet curable inkjet ink can be used. As a pattern to be printed, a pattern suitable for a scene in which the decorative sheet 1 or a decorative board using the decorative sheet 1 is used, such as wood grain, cork, pottery, and abstract pattern can be selected. Further, the color of the colored inkjet ink is not limited to cyan, magenta, yellow, and black that are usually used, and other colors such as orange, green, and violet can also be used.

The transparent printing layer 4a is a layer in which a transparent inkjet ink is printed in an area other than the pattern printing layer 4b in order to improve the smoothness of the entire printing layer 4. The transparent inkjet ink is obtained by removing a coloring component such as a pigment from the colored inkjet ink, and components other than the coloring component such as a resin are the same as those of the colored inkjet ink. Further, by providing the transparent printing layer 4a, the interface between the anchor layer 3 and the clear layer 5 is eliminated, and only the adhesiveness between the printing raw fabric 2 and the anchor layer 3 and the anchor layer 3 and the printing layer 4 need to be considered. The choice of the material which can be used for the anchor layer 3 can be expanded.

(Clear layer)
The clear layer 5 is a layer made of a resin that is transparent or translucent to such an extent that the pattern of the printed layer 4 can be seen through. An example of the transparent or translucent resin is an ultraviolet curable resin.

<Decorative board>
Using the decorative sheet 1 of the present invention, a decorative board 10 as illustrated in FIG. 2 can be produced.
The decorative board 10 of the present invention has a primer layer 6, an adhesive layer 7, and a base material 8 on the surface opposite to the surface on which the anchor layer 3 of the printing original fabric 2 of the decorative sheet 1 of the present invention is formed. And in this order.

(Primer layer)
The primer layer 6 is a sheet-like layer made of a primer. As a material for the primer, a known material can be preferably used. For example, a mixture of a polyester urethane-based resin and a vinyl chloride-vinyl acetate copolymer can be used, but is not limited thereto.

(Adhesive layer)
The adhesive layer 7 is a sheet-like layer made of an adhesive. As an adhesive material, a known adhesive can be suitably used. Examples thereof include, but are not limited to, PUR (Poly Ureethane Reactive Hot Melt Adhesive) adhesive which is a reactive hot melt material.

(Base material)
The base material 8 is a plate-shaped member made of a metal-based or wood-based material. Examples of the metal material include aluminum, steel, stainless steel, and a composite panel. As the composite panel, for example, a sheet-like resin layer serving as a core material and a metal plate (aluminum plate, Galvalume steel plate (registered trademark), stainless steel plate, etc.) attached to both surfaces of the resin layer were provided. There is something. Examples of the wood-based material include MDF (Medium Density Fiberboard), plywood, and particle board.

  Next, the Example about the decorative board of this invention is described.

<Example 1>
First, a coating solution for the primer layer 6 was applied to one surface of the printing original fabric 2. As the printing raw fabric 2, a polyester film raw fabric having a thickness of 0.060 mm was used. As the coating solution, a polyester urethane-based vinyl chloride-vinyl acetate copolymer containing 3 parts by mass of a curing agent with respect to 100 parts by mass of the main agent was used. 1.5% by mass of silica particles having a volume-based average particle diameter of 2 μm by a dynamic light scattering method was added. Moreover, the coating amount of the coating liquid was set to 1.2 g / m ² . After the coating, the primer layer 6 was formed on one surface of the printing original fabric 2 by drying.

Next, a coating solution for the anchor layer 3 was applied to the other surface of the printing original fabric 2. As the coating liquid for the anchor layer 3, an acrylic urethane resin coating liquid containing 10 parts by mass of a curing agent with respect to 100 parts by mass of the main agent was used. The glass transition point of the acrylic urethane resin was 102 ° C. To this coating solution, 3.8% by mass of the silica particles was added. The coating amount was 1.3 g / m ² . After coating, the anchor layer 3 was formed on the printing original fabric 2 by drying.

Next, the base material 8 was bonded to the surface of the printing original fabric 2 on which the primer layer 6 was formed. Specifically, the adhesive layer 7 was first formed on the primer layer 6 and then the base material 8 was adhered. As an adhesive, a PUR adhesive was used, and its application amount was 40 g / m ^2. After coating, the adhesive layer 7 was obtained by drying. As the base material 8, MDF which is a woody base material having a thickness of 15 mm was used.

  Next, the printing layer 4 was obtained by printing a pattern etc. on the anchor layer 3 by inkjet printing. Specifically, VersaUV LEJ-640 manufactured by Roland DG is used as an ink jet printer, and the pattern printing layer 4b is printed with genuine CMYK ink, and the transparent printing layer 4a is pure clear ink (with coloring components). (Clear ink not contained) was used for printing.

  Next, a coating solution for clear layer 5 (RF-00-197 manufactured by Sanyu Paint Co., Ltd.) was applied on print layer 4 by flow coating. Subsequently, the clear layer 5 was formed by curing the applied coating solution with ionizing radiation. The thickness of the clear layer 5 was 80 μm. The sample of the decorative board 10 was produced for the above use.

  Next, a comparative example will be described.

<Comparative Example 1>
A decorative board sample was produced in the same manner as in Example 1, except that the anchor layer 3 was not provided and the transparent printing layer 4a was not printed.

<Comparative example 2>
A decorative plate sample was prepared in the same manner as in Example 1 except that the transparent printing layer 4a was not printed.

<Comparative Example 3>
A decorative board sample was prepared in the same manner as in Comparative Example 2 except that the main component of the coating liquid used for forming the anchor layer 3 was changed to an acrylic resin.

<Comparative Example 4>
A decorative board sample was prepared in the same manner as in Comparative Example 2 except that the main component of the coating liquid used for forming the anchor layer 3 was changed to polycarbonate resin.

<Comparative Example 5>
Comparative Example 2 except that the anchor layer 3 has a two-layer structure, and the coating liquid used is coated in the order of the coating liquid changed to polycarbonate resin and the coating liquid changed to polyester resin. Similarly, a decorative board sample was prepared.

<Evaluation>
The decorative board samples produced as described above were evaluated for the evaluation items of surface roughness, gloss, high gloss, and adhesion.

(Evaluation of surface roughness)
The surface roughness (Ra) was evaluated according to the method specified in JIS B0601. As the evaluation device, SURFTEST SJ-410 manufactured by Mitutoyo was used.

(Glossiness evaluation)
The glossiness was measured according to the method defined in JIS Z8741. As the measuring device, GLOSSCHECKER IG-320 manufactured by HORIBA was used.

(Determination of high gloss feeling)
Glossiness of 90.0 or more was judged as ◯ (good), and less than 90.0 was judged as x (bad).

(Evaluation of adhesion)
Adhesion was evaluated according to the method defined in JIS K5600. As a result of tape peeling, in the evaluation piece cut into a grid pattern, a case where no peeling was observed was evaluated as ◯ (good), and a case where one or more peelings were observed was evaluated as x (defective).

  The above evaluation and determination results are summarized in Table 1.

In Example 1, the glossiness was 92.1, and it was only 90.0 or more, the high gloss feeling was good, and the adhesion was also good. In Comparative Examples 1 to 5, the glossiness was less than 90.0, and the high gloss feeling was poor. Regarding the adhesion, Comparative Example 5 was also good, but because the high gloss feeling was poor, the overall judgment was poor.
The surface roughness (Ra) exceeded 0.100 μm in all of Comparative Examples 1 to 5 except that only Example 1 was less than 0.100 μm. In Example 1, the surface roughness (Ra) was other than the pattern printing layer 4b. As a result of forming the transparent printing layer 4a in the region, it was found that the surface roughness was reduced.

  Although the example about a decorative board was described above, a decorative sheet can be produced similarly. Specifically, in Example 1, the primer layer 6 is first formed on one side of the printing original fabric 2, but this step is omitted, the anchor layer 3 is formed, and then the printing layer 4 and clear layer are formed. The decorative sheet 1 of the present invention can be produced by sequentially forming the layer 5.

DESCRIPTION OF SYMBOLS 1 ... Decorative sheet 2 ... Original printing fabric 3 ... Anchor layer 4 ... Print layer 4a ... Picture print layer 4b ... Transparent print layer 5 ... Clear layer 6 ... Primer Layer 7 ... Adhesive layer 8 ... Base material 10 ... Decorative plate

Claims (5)

In the decorative sheet provided with the anchor layer for enhancing the adhesion of the inkjet ink, the printed layer by inkjet printing, and the clear layer that is a transparent protective layer on the printing original fabric in this order,
A decorative sheet, wherein the printing layer is composed of a pattern printing layer in which a pattern is printed with a colored inkjet ink, and a transparent printing layer in which a transparent inkjet ink is printed on a portion other than the pattern printing layer.   The decorative sheet according to claim 1, wherein the printing material is one of a polyolefin resin and a polyester resin.   The decorative sheet according to claim 1 or 2, wherein the colored and transparent inkjet ink is an ultraviolet curable ink.   The decorative sheet according to any one of claims 1 to 3, wherein the anchor layer contains at least one of a polyester resin, a polycarbonate resin, and an acrylic resin.   The decorative sheet according to any one of claims 1 to 5, wherein the clear layer is a resin layer crosslinked and cured by irradiation with ionizing radiation.

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