Decorative sheet and decorative plate

Abstract

To provide a decorative sheet and a decorative panel enhanced in the adhesion of a base paper layer and the thermoplastic resin layer provided on one surface of the base paper layer.SOLUTION: The decorated sheet 10 includes a raw paper layer 1, a thermoplastic-resin layer 2 provided on the upper side UP of the raw paper layer 1, and a picture pattern layer 4 provided on the upper side UP of the thermoplastic-resin layer 2, wherein the peeling strength of the raw paper layer 1 is 150gf or more. The decorative plate 100 includes a decorative sheet 10 and a base material 20 provided on the lower side LO of the decorative sheet 10.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a decorative sheet and a decorative board. [Background technology]

[0002] BACKGROUND ART Conventionally, decorative sheets have been used as surface materials for furniture and residential building materials. For example, decorative sheets have a thermoplastic resin layer laminated on one side of a base paper layer to impart functions such as water resistance and oil resistance.

[0003] An example of a decorative sheet having a base paper layer and a thermoplastic resin layer is the decorative paper described in Patent Document 1. The decorative paper described in Patent Document 1 is a decorative paper in which a thermoplastic resin layer and a pattern layer are laminated in this order on one side of the base paper. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2020-75442 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in decorative sheets in which a thermoplastic resin layer is laminated on one side of a base paper (base paper layer), such as the decorative paper described in Patent Document 1, if the peel strength of the base paper layer is insufficient, the adhesion between the base paper layer and the thermoplastic resin layer may be reduced.

[0006] In view of the above circumstances, an object of the present invention is to provide a decorative sheet and decorative board in which the adhesion between the base paper layer and the thermoplastic resin layer provided on one side of the base paper layer is improved. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention proposes the following means. The decorative sheet of the present invention comprises a base paper layer, a thermoplastic resin layer provided on the upper side of the base paper layer, and a picture pattern layer provided on the upper side of the thermoplastic resin layer, and the peel strength of the base paper layer is 150 gf or more.

[0008] In the decorative sheet, the interlaminar peel strength between the base paper layer and the thermoplastic resin layer may be 9.0 N or more.

[0009] In the decorative sheet, the base paper layer has a basis weight of 20 g / m 2 More than 100g / m 2 It may be the following:

[0010] In the decorative sheet, the thickness of the thermoplastic resin layer may be 10 μm or more, and may be 20% or more and 80% or less of the thickness of the base paper layer.

[0011] The decorative sheet may further include a base colored layer provided on the upper side of the thermoplastic resin layer and below the picture pattern layer.

[0012] The decorative board of the present invention comprises any of the decorative sheets described above and a substrate provided below the decorative sheet. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a decorative sheet and decorative board in which the adhesion between the base paper layer and the thermoplastic resin layer provided on one side of the base paper layer is improved. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a cross-sectional view schematically showing a decorative board according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] An embodiment of the present invention will be described with reference to the drawings.

[0016] FIG. 1 is a cross-sectional view that schematically shows a decorative board 100 according to this embodiment.

[0017] In this embodiment, as shown in Figure 1, the thickness direction of the decorative board 100 is defined as the "vertical direction V", the side of the decorative board 100 on which the base material 20 is provided is defined as the "lower side LO" in the vertical direction V, and the side opposite the lower side LO is defined as the "upper side UP" in the vertical direction V.

[0018] The decorative board 100 comprises a decorative sheet 10 and a substrate 20 .

[0019] The substrate 20 is a layer provided on the lower side LO of the decorative board 100. The substrate 20 is adhered to the lower side LO of the decorative sheet 10. As the substrate 20, particle board, medium density fiberboard (MDF), or the like can be used.

[0020] The substrate 20 may be a metal plate-like member such as aluminum or stainless steel, or a composite plate in which metal such as aluminum is attached to both sides of a core material made of resin such as polyethylene.

[0021] The decorative sheet 10 comprises a base paper layer 1, a thermoplastic resin layer 2, a base colored layer 3, a picture design layer 4, and a surface protective layer 7.

[0022] The base paper layer 1 is a layer provided on the lower side LO of the decorative sheet 10. A substrate 20 is adhered to the surface of the lower side LO of the base paper layer 1 (lower surface 1b).

[0023] As the base paper layer 1, a fibrous sheet such as a thin paper such as a reinforced paper or a printing paper, or a titanium paper can be used.

[0024] The base paper layer 1 has a peel strength of 150 gf or more. In this embodiment, the peel strength refers to the peel strength measured by a T-peel test in accordance with JIS K 6854-3. That is, the base paper layer 1 has a T-peel strength of 150 gf or more.

[0025] The basis weight of the base paper layer 1 is 20 g / m 2 More than 100g / m2 The following is preferable: This allows the base paper layer 1 to have stiffness, making the decorative sheet 10 less likely to wrinkle and preventing the decorative sheet 10 from curling.

[0026] The thermoplastic resin layer 2 is a layer provided on one surface of the base paper layer 1. In this embodiment, the thermoplastic resin layer 2 is provided on the surface of the upper side UP of the base paper layer 1 (upper surface 1s).

[0027] An olefin-based resin such as polyethylene or polypropylene can be used as the thermoplastic resin layer 2. By using an olefin-based resin as the thermoplastic resin layer 2, the scratch resistance of the decorative sheet 10 can be improved.

[0028] It is preferable to use a moisture-proof material for the thermoplastic resin layer 2. By using a moisture-proof thermoplastic resin layer 2, it is possible to prevent water vapor from passing from the surface 10s of the decorative sheet 10 to the base paper layer 1 and substrate 20, resulting in a decorative sheet 10 and decorative board 100 with excellent water resistance. The surface 10s of the decorative sheet 10 refers to the upper side UP of the decorative sheet 10, as shown in Figure 1.

[0029] The thickness of the thermoplastic resin layer 2 is preferably 10 μm or more, and is 20% to 80% of the thickness of the base paper layer 1.

[0030] By making the thickness of the thermoplastic resin layer 2 10 μm or more and 20% or more of the thickness of the base paper layer 1, a sufficient moisture-proof effect can be obtained.

[0031] Furthermore, by making the thickness of the thermoplastic resin layer 2 80% or less of the thickness of the base paper layer 1, the occurrence of curling of the decorative sheet 10 can be prevented.

[0032] The thermoplastic resin layer 2 can be formed by melt extrusion molding, dry lamination, wet lamination, non-solvent lamination, wax lamination, or the like.

[0033] The interlayer peel strength between the base paper layer 1 and the thermoplastic resin layer 2 is preferably 9.0 N or more. Here, the interlayer peel strength between the base paper layer 1 and the thermoplastic resin layer 2 refers to the T-peel strength between the upper surface 1s of the base paper layer 1 and the lower surface 2b (the surface of the lower side LO) of the thermoplastic resin layer 2.

[0034] Corona treatment may be performed on the surface (upper surface 2s) of the upper side UP of the thermoplastic resin layer 2. By performing corona treatment on the upper surface 2s of the thermoplastic resin layer 2, polar groups are generated and wettability is improved, thereby improving the adhesion between the thermoplastic resin layer 2 and the undercoat colored layer 3.

[0035] The base colored layer 3 is a layer provided on the upper side UP of the thermoplastic resin layer 2. The base colored layer 3 is formed on the upper surface 2s of the thermoplastic resin layer 2 by printing, for example.

[0036] The base coloring layer 3 is a layer that provides base coloring for the picture pattern layer 4 and also provides concealment to prevent the color and texture of the thermoplastic resin layer 2, base paper layer 1, and substrate 20 from penetrating through to the surface 10s of the decorative sheet 10.

[0037] For the base colored layer 3, for example, a two-component curing urethane resin ink containing an isocyanate curing agent can be used.

[0038] Since urethane resin has a polar group, it has excellent adhesion. Therefore, by forming a base colored layer 3 containing a urethane resin on the upper surface 2s of the thermoplastic resin layer 2 that has been subjected to corona treatment, high adhesion can be achieved between the thermoplastic resin layer 2 and the base colored layer 3.

[0039] As a method for forming the colored base layer 3, a known printing method such as gravure printing, offset printing, flexographic printing, silk screen printing, or inkjet printing can be used.

[0040] The picture pattern layer 4 is a layer provided on the upper side UP of the base colored layer 3, and is a layer formed by printing a picture pattern such as wood grain, stone grain, or sand grain.

[0041] A known printing method such as gravure printing, offset printing, flexographic printing, silk screen printing, or inkjet printing can be used to form the picture pattern layer 4. Also, a known printing ink suitable for the printing method to be used can be used for the picture pattern layer 4.

[0042] The surface protective layer 7 is a layer provided on the upper side UP of the picture pattern layer 4. The surface protective layer 7 has a first surface protective layer 5 formed on the upper side UP of the picture pattern layer 4, and a second surface protective layer 6 formed on the upper side UP of the first surface protective layer 5.

[0043] For the first surface protective layer 5, it is preferable to use a transparent or semi-transparent material that allows the design of the design pattern layer 4 to be seen through.

[0044] The first surface protective layer 5 may be made of a thermosetting resin having a urethane bond or an ionizing radiation curable resin such as an acrylic resin.

[0045] Known printing methods such as gravure printing, offset printing, flexographic printing, silk screen printing, and inkjet printing can be used to form the first surface protective layer 5. The first surface protective layer 5 may also be formed using a known coating device.

[0046] For the second surface protective layer 6, it is preferable to use a transparent or semi-transparent material that allows the design of the design pattern layer 4 to be seen through the first surface protective layer 5.

[0047] The second surface protective layer 6 may be made of a thermosetting resin having a urethane bond or an ionizing radiation curable resin such as an acrylic resin.

[0048] Known printing methods such as gravure printing, offset printing, flexographic printing, silk screen printing, and inkjet printing can be used to form the second surface protective layer 6. The second surface protective layer 6 may also be formed using a known coating device.

[0049] The first surface protective layer 5 and the second surface protective layer 6 have different glosses. One method for imparting a difference in gloss between the first surface protective layer 5 and the second surface protective layer 6 is to add a matting agent to the first surface protective layer 5.

[0050] By adding a matting agent to the first surface protective layer 5, the gloss of the first surface protective layer 5 can be made lower than the gloss of the second surface protective layer 6. In other words, the first surface protective layer 5 functions as a matte layer.

[0051] Furthermore, different amounts of matting agent may be added to the first surface protective layer 5 and the second surface protective layer 6 to the extent that a difference in gloss can be imparted between the first surface protective layer 5 and the second surface protective layer 6.

[0052] As the matting agent, for example, fine particles made of inorganic substances such as silica, alumina (α-alumina, etc.), calcium carbonate, barium sulfate, kaolinite, alumina silicate, etc., or organic substances such as polycarbonate, nylon, urethane resin, acrylic resin, styrene resin, silicone resin, etc. can be used.

[0053] In addition, the second surface protective layer 6 may be formed from a resin material that has a higher gloss than the resin material used for the first surface protective layer 5, thereby imparting a difference in gloss between the first surface protective layer 5 and the second surface protective layer 6.

[0054] The difference in gloss between the first surface protective layer 5 and the second surface protective layer 6 can be used to create a visual three-dimensional effect by taking advantage of an optical illusion of the human eye.

[0055] 1, the second surface protective layer 6 may be partially provided on the upper side UP of the first surface protective layer 5. The second surface protective layer 6 may also be provided in a position that is in harmony with the pattern of the picture pattern layer 4.

[0056] For example, if the design layer 4 has a wood grain pattern, by forming the second surface protective layer 6 in a position that is in sync with the vessel portion of the wood grain pattern, the difference in gloss between the first surface protective layer 5 and the second surface protective layer 6 gives the vessel portion a visual three-dimensional effect, thereby providing a decorative sheet 10 and decorative board 100 with a wood grain pattern that more closely resembles the appearance of natural wood.

[0057] As described above, the peel strength of the base paper layer 1 is 150 gf or more. By making the peel strength of the base paper layer 1 150 gf or more, the adhesion between the base paper layer 1 and the thermoplastic resin layer 2 can be improved.

[0058] For example, when the thermoplastic resin layer 2 is formed on the upper surface 1s of the base paper layer 1 by melt extrusion molding, the thermoplastic resin layer 2 is formed in a state where part of the resin material forming the thermoplastic resin layer 2 has soaked into the base paper layer 1.

[0059] If the peel strength of the base paper layer is less than 150 gf, when a force is applied to the decorative sheet in a direction that causes the upper surface of the base paper layer to peel away from the lower surface of the thermoplastic resin layer, the upper surface of the base paper layer may peel away together with the thermoplastic resin layer while remaining in close contact with the thermoplastic resin layer.

[0060] That is, if the peel strength of the base-paper layer is less than 150 gf, peeling may occur between the base-paper layers near the upper surface of the base-paper layer.

[0061] In the decorative sheet 10 and decorative board 100 of this embodiment, by making the peel strength of the base paper layer 1 150 gf or more, even when a force is applied in a direction that causes the upper surface 1s of the base paper layer 1 to peel from the lower surface 2b of the thermoplastic resin layer 2, peeling between the layers of the base paper layer 1 can be suppressed, and the adhesion between the base paper layer 1 and the thermoplastic resin layer 2 can be sufficiently maintained.

[0062] For example, by using a base paper layer 1 with a peel strength of 150 gf or more, a decorative sheet 10 and a decorative board 100 can be realized in which the peel strength between the base paper layer 1 and the thermoplastic resin layer 2 is 9.0 N or more, and a decorative sheet 10 and a decorative board 100 can be realized in which the adhesion between the base paper layer 1 and the thermoplastic resin layer 2 is improved compared to conventional decorative sheets and decorative boards.

[0063] The decorative sheet 10 of this embodiment comprises a base paper layer 1, a thermoplastic resin layer 2 provided on the upper side UP of the base paper layer 1, and a picture pattern layer 4 provided on the upper side UP of the thermoplastic resin layer 2, and the peel strength of the base paper layer 1 is 150 gf or more.

[0064] The decorative board 100 of this embodiment comprises a decorative sheet 10 and a substrate 20 provided on the lower side LO of the decorative sheet 10.

[0065] According to the decorative sheet 10 and decorative board 100 of this embodiment, a decorative sheet 10 and decorative board 100 can be provided that have improved adhesion between the base paper layer 1 and the thermoplastic resin layer 2 provided on one side of the base paper layer 1.

[0066] Although one embodiment of the present invention has been described above in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design modifications and the like are also included within the scope of the present invention. Furthermore, the components shown in the above-described embodiment and the following modified examples can be appropriately combined to form a configuration.

[0067] (Variation 1) In the above embodiment, the decorative sheet 10 is provided with a base colored layer 3, but the form of the decorative sheet is not limited to this. The decorative sheet does not have to be provided with a base colored layer.

[0068] In the above embodiment, the base coloring layer 3 is a layer that provides base coloring for the picture pattern layer 4 and concealing properties to prevent the color and texture of the thermoplastic resin layer 2, base paper layer 1, and substrate 20 from penetrating through to the surface 10s of the decorative sheet 10.

[0069] If sufficient base coloring and hiding power can be obtained without providing a base coloring layer, the decorative sheet does not need to be provided with a base coloring layer.

[0070] When the decorative sheet does not include a base color layer, the picture design layer is provided on the upper surface of the thermoplastic resin layer.

[0071] The present invention will be described in detail below with reference to examples, but the present invention is not limited to the following examples.

[0072] Example 1 Base paper layer 1: basis weight 20 g / m 2 A reinforced inter-paper paper having a T-peel strength of 180 gf was prepared.

[0073] A polypropylene (PP) resin having a thickness of 16 μm was provided on the upper surface 1s of the base paper layer 1 by melt extrusion molding to form a thermoplastic resin layer 2. The upper surface 2s of the thermoplastic resin layer 2 was subjected to corona treatment.

[0074] A urethane ink (PCNT manufactured by Toyo Ink Co., Ltd.) containing an isocyanate curing agent was printed by gravure printing on the upper surface 2s of the thermoplastic resin layer 2 that had been subjected to corona treatment, to form a base colored layer 3.

[0075] A urethane ink (PCNT manufactured by Toyo Ink Co., Ltd.) was printed by gravure printing on the upper surface UP of the base colored layer 3 to form a picture pattern layer 4 having a wood grain pattern.

[0076] A urethane resin was applied to the upper surface UP of the picture pattern layer 4 as a first surface protective layer 5 .

[0077] A urethane-based gloss resin was applied to the upper surface UP of the first surface protective layer 5 as the second surface protective layer 6. The second surface protective layer 6 was applied using a die that matched the vessels in the wood grain pattern of the picture design layer 4.

[0078] After applying the second surface protective layer 6, the product was cured at 60°C for 96 hours to cause the curing agent added to the surface protective layer 7 (first surface protective layer 5 and second surface protective layer 6) to react and harden the surface protective layer 7, thereby obtaining the decorative sheet 10 of Example 1.

[0079] Example 2 Base paper layer 1: basis weight 30 g / m 2 A decorative sheet 10 of Example 2 was obtained in the same manner as in Example 1, except that a reinforced inter-paper paper having a T-peel strength of 180 gf was used.

[0080] Example 3 Base paper layer 1: basis weight 40 g / m 2 A decorative sheet 10 of Example 3 was obtained in the same manner as in Example 1, except that a printed paper having a T-peel strength of 150 gf was used.

[0081] Example 4 Base paper layer 1: basis weight 45 g / m 2 A decorative sheet 10 of Example 4 was obtained in the same manner as in Example 1, except that a printed paper having a T-peel strength of 185 gf was used.

[0082] Example 5 Base paper layer 1: basis weight 50 g / m 2 A decorative sheet 10 of Example 5 was obtained in the same manner as in Example 1, except that a printed paper having a T-peel strength of 200 gf was used.

[0083] (Comparative Example 1) Base paper layer: 30g / m 2 A decorative sheet of Comparative Example 1 was obtained in the same manner as in Example 1, except that a reinforced inter-paper paper having a T-peel strength of 140 gf was used.

[0084] (Test 1) Peel strength tests were conducted on the decorative sheets of Examples 1-5 and Comparative Example 1. In the peel strength test, a base material such as MDF was attached to the upper surface of the decorative sheet with double-sided tape, and the decorative sheet was reinforced with 25 mm wide cellophane tape to prevent tearing, and the T-peel strength of the decorative sheet was measured using a load cell type tensile tester.

[0085] The T-peel strength measured in the peel strength test is the peel strength between the base paper layer and the thermoplastic resin layer. In the peel strength test, the width of the test piece was 25 mm and the peel speed was 200 mm / min.

[0086] In addition, in the peel strength test, the peeled surface between the peeled base paper layer and the thermoplastic resin layer was also observed.

[0087] (Test 2) A crosshatch tape (crosscut) test was carried out on the decorative sheets of Examples 1-5 and Comparative Example 1. The crosshatch tape test was carried out in accordance with JIS K 5600.

[0088] Specifically, a decorative board was created by attaching a base material such as MDF to the underside of a decorative sheet using a vinyl acetate adhesive or the like. 10 x 10 1mm square grid cuts were made on the surface of the decorative sheet, and cellophane tape manufactured by Nichiban Co., Ltd. was attached to the cut areas and peeled off at an angle of approximately 60 degrees to the surface of the decorative sheet.

[0089] Thereafter, the presence or absence of peeled grids on the surface of the decorative sheet was evaluated.

[0090] The evaluation criteria were two-level, with ◯ being considered a pass. ◯ (Good): No peeling of the grid occurred. × (Poor): Peeling of the grid occurred.

[0091] (Test results) The results of Test 1-2 are shown in Table 1. Table 1 also shows the basis weight and T-peel strength of the base paper layer.

[0092] In addition, the column "peeling surface" in Table 1 shows the observation results of the peeling surface between the base paper layer and the thermoplastic resin layer carried out in Test 1.

[0093] "Between the sheets" in the observation results of the peeled surface shown in Table 1 indicates that part of the base paper layer peeled off together with the thermoplastic resin layer, and peeling occurred between the base paper layers.

[0094] In addition, the "PP elongation" column in Table 1 indicates whether or not the thermoplastic resin layer elongated. "Yes" indicates that when the thermoplastic resin layer in close contact with the base paper layer was pulled using a tensile tester, elongation occurred in the thermoplastic resin layer as plastic deformation.

[0095] "None" in "PP elongation" indicates that no elongation as plastic deformation occurred in the thermoplastic resin layer when pulled by a tensile tester.

[0096] Furthermore, in Table 1, for the cases where peeling of the squares occurred in Test 2, the number of peeled squares is also recorded.

[0097] Example 1-5, in which the peel strength of the base paper layer 1 was 150 gf or more, showed good results in Test 2. Furthermore, Example 1-5 had a peel strength of 9.0 N or more measured in Test 1.

[0098] In Test 1, among Examples 1-5 and Comparative Example 1, Example 1, which had the highest measured peel strength, and Example 4, which had the second highest measured peel strength after Example 1, experienced elongation of the thermoplastic resin layer 2.

[0099] Comparative Example 1, in which the peel strength of the base-paper layer was less than 150 gf, failed Test 2. In Comparative Example 1, 5 of the 100 squares peeled off in Test 2.

[0100] The peel strength of Comparative Example 1 measured in Test 1 was 7.8 N, which was smaller than the peel strength of Example 3, which was 9.0 N and was the smallest peel strength measured in Test 1 among Examples 1-5.

[0101] In Test 1, in Examples 1-5 and Comparative Example 1, peeling occurred between the base paper layers.

[0102] [Table 1] [Explanation of symbols]

[0103] 100 decorative panels 10 Decorative Sheet 1 Base paper layer 2 Thermoplastic resin layer 3. Base color layer 4. Pattern layer V vertical direction UP upper side LO lower side

Claims

1. a base paper layer; a thermoplastic resin layer provided on the upper side of the base paper layer; a picture pattern layer provided on the upper side of the thermoplastic resin layer; Equipped with The peel strength of the base paper layer is 150 gf or more. Decorative sheet.

2. The peel strength between the base paper layer and the thermoplastic resin layer is 9.0 N or more. The decorative sheet according to claim 1 .

3. The base paper layer has a basis weight of 20 g / m ２ More than 100g / m ２ Below is the The decorative sheet according to claim 2.

4. The thickness of the thermoplastic resin layer is 10 μm or more, and is 20% or more and 80% or less of the thickness of the base paper layer. The decorative sheet according to claim 3.

5. a base colored layer provided on the upper side of the thermoplastic resin layer and on the lower side of the picture pattern layer; The decorative sheet according to claim 4.

6. The decorative sheet according to any one of claims 1 to 5, a substrate provided below the decorative sheet; Equipped with Decorative panel.

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