Foamed wall paper

Abstract

To provide a foamed wall paper having good surface strength, improving designability by remarkably suppressing appearance change after embossing, and capable of reducing environment load.SOLUTION: A foamed wall paper 1 is formed by laminating a substrate layer 2 that is a non-foamed layer, a foaming agent containing resin layer 3 containing a foaming agent and laminated on the substrate layer 2, a pattern layer 5, and a surface protective layer 6 in this order. The pattern layer 5 is formed using aqueous inkjet ink. The surface protective layer 6 is formed by containing urethane-based resin. Embossing is applied from the surface protective layer 6 side.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to foam wallpaper. [Background technology]

[0002] As an example of wallpaper formed using inkjet printing, there is the wallpaper disclosed in Patent Document 1. The wallpaper disclosed in Patent Document 1 includes a base layer (support reinforcing member), a foaming agent-containing resin layer (a thermoplastic resin layer made from a material in which a heated foaming agent is dispersed), and a pattern layer (an inkjet ink receiving layer). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-150660 A Summary of the Invention [Problem to be solved by the invention]

[0004] Decorative sheets for building materials used for covering building materials are required to have weather resistance, and for this reason, acrylic resins, which are relatively inexpensive and have weather resistance, are often used for the top coat layer (surface protective layer). On the other hand, wallpaper is required to have improved design. For this reason, the surface is often embossed. However, conventional surface protection layers made of acrylic resins cannot conform to the embossed shape, and after embossing, changes in appearance such as cracks and whitening may occur on the surface. For this reason, there was a problem that embossing actually reduces the design. Additionally, as environmental considerations have become increasingly important in recent years, there is also a demand in the field of foam wallpaper to reduce the amount of volatile organic compounds (VOCs) used compared to solvent-based inkjet inks, thereby reducing the environmental impact. Furthermore, foamed wallpaper is also required to have a surface strength (such as abrasion resistance and scratch resistance) sufficient to withstand use as wallpaper.

[0005] In view of the above-mentioned problems, the present disclosure aims to provide a foamed wallpaper that has good surface strength, significantly suppresses changes in appearance after embossing to improve design, and can reduce the environmental impact. [Means for solving the problem]

[0006] In order to solve the above problems, one aspect of the present invention is a laminate comprising a base layer which is a non-foamed layer, a foaming agent-containing resin layer which contains a foaming agent and is laminated on the base layer, a design layer, and a surface protective layer, laminated in this order, the design layer being formed using an aqueous inkjet ink, the surface protective layer being formed containing a urethane-based resin, and embossing being applied from the surface protective layer side. Effect of the Invention

[0007] According to one aspect of the present invention, it is possible to provide foamed wallpaper that has good surface strength, significantly suppresses changes in appearance after embossing, improves design, and reduces environmental impact. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a cross-sectional view showing a configuration of a foam wallpaper in one embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present technology (hereinafter, referred to as "the present embodiment") will be described with reference to the drawings. In the description of the drawings, the same or similar parts are given the same or similar reference numerals, and duplicated descriptions are omitted. Each drawing is schematic and may differ from the actual one. The embodiments shown below are examples of devices and methods for embodying the technical idea of ​​the present technology, and the technical idea of ​​the present technology is not limited to the devices and methods exemplified in the following embodiments. The technical idea of ​​the present technology can be modified in various ways within the technical scope described in the claims. In addition, the directions of "left and right" and "up and down" in the following description are simply definitions for the convenience of explanation and do not limit the technical idea of ​​the present invention. Therefore, for example, if the paper is rotated 90 degrees, "left and right" and "up and down" are read interchangeably, and of course, if the paper is rotated 180 degrees, "left" becomes "right" and "right" becomes "left".

[0010] As shown in Fig. 1, the foamable wallpaper 1 comprises a base layer 2, a foaming agent-containing resin layer 3, a primer layer 4, a pattern layer 5, and a surface protective layer 6. If the foaming agent-containing resin layer 3 or the pattern layer 5 functions as a primer layer, there is no need to provide a separate primer layer 4. In other words, the foamable wallpaper 1 only needs to have at least the base layer 2, the foaming agent-containing resin layer 3, the pattern layer 5, and the surface protective layer 6 laminated in this order. Furthermore, the foamable wallpaper 1 is embossed from the surface protective layer 6 side.

[0011] <Base material layer> The base material layer 2 is a non-foamed layer, and is formed using a material that is commonly used as a base material layer, such as backing paper for wallpaper. In this embodiment, the base material layer 2 has a basis weight of, for example, 50 [g / m 2 ] or more 100[g / m 2 ] or less and the thickness is within the range of 70 [μm] to 150 [μm] (plain paper).

[0012] <Foaming agent-containing resin layer> The foaming agent-containing resin layer 3 is laminated on one surface of the base layer 2 (the upper surface of the base layer 2 in FIG. 1). The foaming agent-containing resin layer 3 is a resin layer formed by using a vinyl chloride resin, and contains a foaming agent 8 .

[0013] Furthermore, the foaming agent-containing resin layer 3 contains at least one of a plasticizer, a viscosity reducer, a stabilizer, a foaming agent, a filler, and titanium oxide. The sum of the thickness of the base layer 2 and the thickness of the foaming agent-containing resin layer 3, i.e., the thickness of the laminate of the base layer 2 and the foaming agent-containing resin layer 3, is within a range of 200 μm to 600 μm, more preferably within a range of 220 μm to 450 μm, and even more preferably within a range of 250 μm to 300 μm.

[0014] The foaming agent 8 contained in the foaming-agent-containing resin layer 3 may be, for example, a thermally expandable microcapsule foaming agent, an azo type, a hydrazide type, a nitroso type, ADCA (azodicarbonamide foaming agent), sodium bicarbonate, or the like. As the foaming agent 8, a thermally expandable microcapsule foaming agent is preferable from the viewpoint of performance (foaming ratio, strength).

[0015] When ADCA and sodium bicarbonate are used as the foaming agent 8, for example, the mixing ratio of ADCA to sodium bicarbonate is set to 3:1 to 1:3, and the total of the two types is mixed within the range of 1 to 4 parts per 100 parts of the vinyl chloride resin. This makes it possible to ensure the foaming ratio and prevent the foamed surface from becoming rough. The amount of foaming agent 8 to be added depends on the thickness and expansion ratio of the foaming-agent-containing resin layer 3, but is preferably in the range of 1 part by weight to 20 parts by weight, particularly 5 parts by weight to 15 parts by weight, per 100 parts by weight of resin.

[0016] <Primer layer> The primer layer 4 is laminated on one surface (the upper surface in FIG. 1) of the foaming agent-containing resin layer 3. As a result, the primer layer 4 is provided between the foaming agent-containing resin layer 3 and the design layer 5. In this embodiment, the method for forming the primer layer is not particularly limited. The primer layer 4 is formed containing at least one resin selected from the group consisting of an acrylic acid-ester copolymer resin, an acrylic-vinyl chloride resin, a polyurethane resin, and a vinyl resin. Furthermore, the resin contained in the primer layer 4 is formed to contain silica. The silica contained in the resin may be amorphous silica (amorphous silicon dioxide).

[0017] The thickness of the primer layer 4 is in the range of 1 μm to 30 μm, more preferably 2 μm to 10 μm. This is because if the thickness of the primer layer 4 is less than 1 μm, the ink adhesion is reduced. Also, if the thickness of the primer layer 4 is more than 30 μm, the non-flammability is reduced. Also, if the foaming agent-containing resin layer 3 or the picture layer 5 has a function as a primer layer, it is not necessary to provide a separate primer layer 4.

[0018] <Pattern layer> The pattern layer 5 is laminated on one surface (the upper surface in FIG. 1) of the primer layer 4, and is a layer for adding a pattern to impart design. That is, the pattern layer 5 is a layer laminated on the surface of the foaming agent-containing resin layer 3 opposite to the surface facing the base material layer 2. The design layer 5 is formed using an aqueous inkjet ink. The aqueous ink contains, for example, an aqueous solvent and a colorant dispersed in the aqueous solvent, and may contain other additives. A known aqueous ink for inkjet printing is used for the design layer 5.

[0019] The aqueous inkjet ink forming the design layer 5 is applied by, for example, inkjet printing. That is, the design layer 5 is formed by, for example, inkjet printing.

[0020] By forming the pattern layer 5 using aqueous inkjet ink, it is possible to reduce the amount of volatile organic compounds (VOCs) used, compared to a configuration in which the pattern layer is formed using solvent ink. In particular, in foamed wallpaper using polyvinyl chloride resin, the pattern layer is often formed using solvent ink, but by using aqueous inkjet ink, the environmental impact can be reduced. Aqueous inkjet inks contain, for example, an aqueous solvent and a colorant dispersed in the aqueous solvent, and may also contain other additives.

[0021] Any pattern can be used as the pattern of the pattern layer 5, such as a wood grain pattern, a stone pattern, a fabric pattern, an abstract pattern, a geometric pattern, letters, symbols, a solid color, or a combination thereof. In order to improve the concealment of the foamed wallpaper 1, a concealment layer may be provided between the pattern layer 5 and the foaming agent-containing resin layer 3. The concealment layer is formed, for example, using an opaque printing ink or paint containing a large amount of opaque pigments such as titanium dioxide or iron oxide.

[0022] In addition, the pattern layer 5 may be configured to have, for example, a solid colored base material layer for concealing the color and pattern of the base on which the foamed wallpaper 1 is attached, and a pattern layer for adding a pattern to impart design features. The thickness of the pattern layer 5 is set within the range of 1 [μm] to 10 [μm], preferably within the range of 0.1 [μm] to 10 [μm], more preferably within the range of 0.5 [μm] to 5 [μm], and even more preferably within the range of 0.7 [μm] to 3 [μm]. This is because when the thickness of the pattern layer 5 is 1 [μm] or more, it is possible to make the printing clear. Also, when the thickness of the pattern layer 5 is 10 [μm] or less, it is possible to improve the printing workability when manufacturing the foamed wallpaper 1 and suppress the manufacturing cost.

[0023] In addition, functional additives such as extender pigments, plasticizers, dispersants, surfactants, tackifiers, adhesive aids, drying agents, hardeners, hardening accelerators, and hardening retarders may be added to the design layer 5 in order to impart various functions.

[0024] <Surface protective layer> The surface protective layer 6 is laminated on one surface of the pattern layer 5 (the upper surface in FIG. 1), and is a layer provided to impart functions such as weather resistance, scratch resistance, stain resistance, and design to the foamed wallpaper 1. That is, the surface protective layer 6 is a layer laminated on the surface of the pattern layer 5 opposite to the surface facing the foaming agent-containing resin layer 3. Furthermore, by providing the surface protective layer 6, the surface strength (e.g., abrasion resistance and scratch resistance) of the surface protective layer 6 can be improved. The surface protective layer 6 is formed containing a urethane resin. This can improve the flexibility of the surface protective layer 6. As the urethane resin, a urethane resin and a urethane vinyl chloride acetate resin (a urethane resin containing a copolymer of vinyl chloride and vinyl acetate) can be used. The content of the urethane resin in the entire surface protective layer 6 is 10 mass % or more. It is preferable that the content is within the range of 50% by mass or less.

[0025] The thickness of the surface protective layer 6 is within the range of 1 [μm] to 30 [μm], preferably within the range of 3 [μm] to 15 [μm], and more preferably within the range of 5 [μm] to 10 [μm]. This is because, if the thickness of the surface protective layer 6 is less than 1 [μm], the possibility of cracking in the surface protective layer 6 increases, and the scratch resistance of the surface protective layer 6 decreases. Also, if the thickness of the surface protective layer 6 exceeds 30 [μm], the non-flammability decreases. In addition, the surface protective layer 6 may contain various additives such as weathering agents, plasticizers, stabilizers, fillers, dispersants, colorants such as dyes and pigments, solvents, ultraviolet absorbers, heat stabilizers, light stabilizers, antiblocking agents, catalyst scatterers, colorants, light scattering agents, and gloss adjusters, as necessary. In addition, the surface protective layer 6 may contain functional additives such as antibacterial agents and antifungal agents, as necessary. In this embodiment, the method of forming the primer layer is not particularly limited.

[0026] <Embossed section> An embossed pattern 7 is formed on the surface of the foamed wallpaper 1 facing the surface protective layer 6. That is, the foamed wallpaper 1 is embossed from the surface protective layer 6 side. The embossed pattern 7 having an uneven shape is formed. That is, the embossed pattern 7 is formed on the outermost surface of the foamed wallpaper 1. The embossed pattern 7 obtained by embossing can be, for example, cloth grain, wood grain duct grooves, stone slab surface unevenness, cloth surface texture, matte finish, sand grain, hairline, and stripe grooves, and can be appropriately selected. As described above, the foamed wallpaper 1 according to this embodiment contains a urethane resin in the surface protective layer 6, and thus has improved flexibility. This makes it possible to significantly prevent appearance changes such as cracks and whitening from occurring on the surface of the foamed wallpaper 1, i.e., the surface protective layer 6, after embossing. This makes it possible to impart high designability to the surface of the foamed wallpaper 1 by using various embossed patterns 7.

[0027] In addition, the shallower the depth of the recesses in the uneven shape of the embossed pattern 7, the more reliably the change in appearance can be suppressed, but in order to express various types of patterns, the formation of deep recesses may be required. Therefore, from the viewpoint of improving design, it is preferable that the depth of the recesses in the uneven shape of the embossed pattern 7 is allowed to exceed 200 μm, that is, the change in appearance can be suppressed even if strong pressure is applied during embossing. In the foamed wallpaper 1 according to this embodiment, the flexibility of the surface protective layer 6 is improved, so that the change in appearance can be suppressed even if strong pressure is applied during embossing. Therefore, various types of patterns can be expressed, and the design can be further improved.

[0028] <The manufacturing method of foam wallpaper> An example of a method for producing the foamed wallpaper 1 will now be described.

[0029] First, a foaming agent-containing resin (for example, vinyl chloride resin) is applied onto the base layer 2 to form the foaming agent-containing resin layer 3. Next, an acrylic resin (e.g., an acrylic acid-ester copolymer resin) is applied onto the foaming agent-containing resin layer 3, and then dried to form a primer layer 4. Furthermore, a pattern is formed on the primer layer 4 by inkjet printing using a water-based inkjet ink, and then dried to form a pattern layer 5. Next, a resin material containing a urethane resin is applied onto the pattern layer 5, and then dried to form a surface protective layer 6. Thereafter, the foaming agent 8 contained in the foaming agent-containing resin layer 3 is foamed by heating. Then, the surface protective layer 6 is embossed. Specifically, an embossed pattern 7 is formed on the surface protective layer 6 by, for example, mechanical embossing using an embossing plate. As a result, a foamed wallpaper 1 having an embossed pattern is formed.

[0030] At this time, the primer layer 4 is formed so as to have a thickness within the range of 1 μm to 30 μm. Moreover, the surface protection layer 6 is formed so as to have a thickness within the range of 1 μm to 30 μm.

[0031] (Effects of this embodiment) The foamed wallpaper 1 of this embodiment can provide the following effects. (1) The foamed wallpaper 1 of this embodiment is composed of a base layer 2 which is a non-foamed layer, a foaming-agent-containing resin layer 3 which contains a foaming agent and is laminated on the base layer 2, a design layer 5, and a surface protective layer 6 which are laminated in this order, the design layer 5 being formed using an aqueous inkjet ink, and the surface protective layer 6 being formed containing a urethane-based resin and having an embossed finish (embossed pattern 7) applied from the surface protective layer 6 side. This allows the foamed wallpaper 1 to have good surface strength, significantly suppress changes in appearance after embossing, improve design, and reduce environmental impact. (2) In the foamed wallpaper 1 according to this embodiment, the primer layer 4 is provided between the foaming-agent-containing resin layer 3 and the picture layer 5 . This can improve the adhesion between the layers. (3) In the foam wallpaper 1 according to this embodiment, the thickness of the surface protective layer 6 is within the range of 1 μm to 30 μm. This makes it possible to suppress the occurrence of cracks in the surface protective layer 6, improve scratch resistance, and further improve non-combustibility. (4) In the foam wallpaper 1 according to this embodiment, the total thickness of the base layer 2 and the foaming-agent-containing resin layer 3 is within a range of 200 μm to 600 μm. This makes embossing easier, improving design, and also maintains the thickness of the cell walls of the foaming agent to improve scratch resistance. (5) In the foaming wallpaper 1 according to this embodiment, the foaming agent-containing resin layer 3 is made of a vinyl chloride resin. This makes it possible to improve durability and non-flammability.

[0032] <Example> The present disclosure will be described in more detail below with reference to examples, but the present disclosure is not limited to the examples.

[0033] Example 1 The non-foamed base layer has a basis weight of 65 g / cm 2 ] and was formed using plain paper (manufactured by Nippon Paper Industries Co., Ltd.) having a thickness of 110 [μm]. A foaming agent-containing resin layer was applied onto the substrate layer using a vinyl chloride resin (manufactured by Tosoh Corporation). Next, a water-based inkjet ink "LIOJET" (manufactured by Toyo Ink Co., Ltd.) was applied onto the foaming agent-containing resin layer by inkjet printing, and then the layer was placed in a hot air oven and dried at a temperature of 180[℃] for 30 seconds to form a pattern layer. In addition, a surface protection layer with a thickness of 7[μm] was formed on the pattern layer using a resin containing a urethane resin, and the layer was placed in a hot air oven and dried at a temperature of 160[℃] for 5 minutes. After that, the layer was heated in a hot air oven at a temperature of 210[℃] for 25 seconds to foam the foaming agent-containing resin layer to a thickness of 150[μm]. Furthermore, mechanical embossing was performed on the surface protective layer side using a matte embossing plate with a depth of 50 μm to obtain a foam wallpaper of Example 1 decorated with an embossed pattern on the surface. The thickness of the laminate of the base material layer and the foaming agent-containing resin layer (total thickness of each layer) was 260 [μm].

[0034] Example 2 An acrylic resin (manufactured by Nissin Chemical Co., Ltd.) was applied onto the foaming agent-containing resin layer, and then dried in a hot air oven at 140°C for 30 seconds to form a primer layer with a thickness of 5 [μm]. The rest of the process was the same as in Example 1 to obtain the foamed wallpaper of Example 2.

[0035] Example 3 The foamed wallpaper of Example 3 was obtained in the same manner as in Example 1, except that the thickness of the foaming agent-containing resin layer was set to 200 μm. Example 4 The foamed wallpaper of Example 4 was obtained in the same manner as in Example 1, except that the thickness of the foaming agent-containing resin layer was set to 450 [μm].

[0036] Example 5 The thickness of the surface protective layer was set to 1 μm. Other than that, the foamed wallpaper of Example 5 was obtained in the same manner as in Example 1. Example 6 The foamed wallpaper of Example 6 was obtained in the same manner as in Example 1, except that the thickness of the surface protective layer was set to 30 μm.

[0037] Example 7 The thickness of the primer layer was set to 1 [μm]. Other than that, the foamed wallpaper of Example 7 was obtained in the same manner as in Example 2. Example 8 The thickness of the primer layer was set to 30 μm. Other than that, the foamed wallpaper of Example 8 was obtained in the same manner as in Example 2.

[0038] Example 9 A texture embossing plate (depth: 250 μm) was used to form an embossed pattern for decoration. Otherwise, the foamed wallpaper of Example 9 was obtained in the same manner as in Example 4. Example 10 A wood grain embossing plate (depth: 400 [μm]) was used to form an embossed pattern for decoration. Except for that, the foamed wallpaper of Example 10 was obtained in the same manner as in Example 4.

[0039] Example 11 The thickness of the base layer was 80 [μm], the thickness of the foaming agent-containing resin layer was 120 [μm], and the total thickness was 200 [μm]. The rest of the thickness was the same as in Example 2 to obtain the foamed wallpaper of Example 11. Example 12 The thickness of the base layer was 150 [μm], the thickness of the foaming agent-containing resin layer was 450 [μm], and the total thickness was 600 [μm]. The rest of the thickness was the same as in Example 2 to obtain the foamed wallpaper of Example 12.

[0040] (Example 13) The thickness of the base layer was 70 [μm], the thickness of the foaming agent-containing resin layer was 150 [μm], and the total thickness was 220 [μm]. The rest of the thickness was the same as in Example 2 to obtain the foamed wallpaper of Example 13. Example 14 The thickness of the base layer was 110 [μm], the thickness of the foaming agent-containing resin layer was 340 [μm], and the total thickness was 450 [μm]. The rest of the thickness was the same as in Example 2 to obtain the foamed wallpaper of Example 14.

[0041] Example 15 The thickness of the base layer was 110 [μm], the thickness of the foaming agent-containing resin layer was 140 [μm], and the total thickness was 250 [μm]. The rest of the thickness was the same as in Example 2 to obtain the foamed wallpaper of Example 15. (Example 16) The thickness of the base layer was 110 [μm], the thickness of the foaming agent-containing resin layer was 240 [μm], and the total thickness was 350 [μm]. The rest of the thickness was the same as in Example 2 to obtain the foamed wallpaper of Example 16.

[0042] (Example 17) The thickness of the primer layer was set to 2 μm. Other than that, the foamed wallpaper of Example 17 was obtained in the same manner as in Example 2. (Example 18) The thickness of the primer layer was set to 10 μm. Other than that, the foamed wallpaper of Example 18 was obtained in the same manner as in Example 2.

[0043] (Example 19) The thickness of the surface protective layer was set to 3 μm. Other than that, the foamed wallpaper of Example 19 was obtained in the same manner as in Example 2. (Example 20) The thickness of the surface protective layer was set to 15 μm. Other than that, the foamed wallpaper of Example 20 was obtained in the same manner as in Example 2.

[0044] Example 21 The thickness of the surface protective layer was set to 5 μm. Other than that, the foamed wallpaper of Example 21 was obtained in the same manner as in Example 2. Example 22 The thickness of the surface protective layer was set to 10 μm. Other than that, the foamed wallpaper of Example 22 was obtained in the same manner as in Example 2.

[0045] Comparative Example 1 A foamed wallpaper of Comparative Example 1 was obtained in the same manner as in Example 1 except that a top coat layer was formed using an acrylic resin. Comparative Example 2 A foamed wallpaper of Comparative Example 2 was obtained in the same manner as in Example 1, except that a surface protective layer was not formed. Comparative Example 3 A pattern layer was formed using a solvent inkjet ink (manufactured by Mimaki Engineering Co., Ltd.) Except for this, the foamed wallpaper of Comparative Example 3 was obtained in the same manner as in Example 1.

[0046] (Performance evaluation, evaluation results) The foamed wallpapers of Examples 1 to 22 and Comparative Examples 1 to 3 were evaluated for design, surface strengthening performance, and reduction in environmental load. The evaluation methods used were as follows.

[0047] <Design> The surface of the foamed wallpaper of each of the Examples and Comparative Examples in which an embossed pattern was formed was visually observed, and the appearance change (presence or absence of cracks and whitening) was evaluated. When no appearance change was observed by visual observation, it was evaluated as "○", and when an appearance change was observed by visual observation, it was evaluated as "×".

[0048] <Surface reinforcement performance> According to the method of the surface strengthening performance regulation of the Wallpaper Industry Association, a specified frictional element (load 200 g) was attached to the friction tester type II specified in JIS L 0849, and the frictional element was moved back and forth five times in both the vertical and horizontal directions on the test piece (foamed wallpaper of each Example and Comparative Example), and then the state of damage on the test piece was judged visually. The evaluation criteria were as follows. [Evaluation Criteria] ⊚: No significant peeling or other damage was observed on the surface. ◯: Peeling is observed on the surface, but the non-foamed layer (base layer) is not visible. ×: The surface is largely peeled off, and the non-foamed layer (base layer) is visible. In this embodiment, a grade of "◯" or higher is considered to be a pass.

[0049] <Reduction of environmental impact> Volatile Organic Compounds The use of materials containing volatile organic compounds (VOCs) was evaluated as "yes" or "no." If it was "no," it was deemed that the environmental impact could be reduced (passed).

[0050] The results of each of the above-mentioned evaluations are shown in Table 1 together with the composition of the printed decorative metal sheet. [Table 1]

[0051] As a result of evaluating various performances using the above-mentioned methods, the foamed wallpapers of Examples 1 to 22 showed excellent performance in all evaluation tests. In other words, it was found that they have good surface strength, significantly suppress the appearance change after embossing, improve the design, and reduce the environmental load. In addition, in Examples 9 and 10, even when embossing was performed to form deep uneven shapes with depths of 250 μm and 400 μm, no change in appearance occurred. Therefore, it was found that it is possible to reliably suppress a significant change in appearance and improve the design.

[0052] On the other hand, the foamed wallpaper of Comparative Example 1-3 was rated "x" (fail) in at least one of the evaluation results, and was unable to demonstrate excellent performance in all of the evaluation tests. Specifically, in the foamed wallpaper of Comparative Example 1, the surface protective layer was formed from an acrylic resin, so flexibility was reduced, and even when the embossing depth was a relatively shallow 50 μm, the appearance changed. In addition, in the foamed wallpaper of Comparative Example 2, the surface protective layer was not provided, so the surface strength was reduced. Furthermore, in the foamed wallpaper of Comparative Example 3, solvent inkjet ink was used for the pattern layer, so it contained volatile organic compounds (VOCs), and the reduction of environmental load was not sufficient.

[0053] The present technology can be configured as follows. (1) A base layer which is a non-foamed layer, a foaming agent-containing resin layer which contains a foaming agent and is laminated on the base layer, a design layer, and a surface protective layer are laminated in this order, The design layer is formed using a water-based inkjet ink, the surface protective layer is formed containing a urethane-based resin, The foamed wallpaper is embossed from the surface protective layer side. (2) The foam wallpaper according to the above (1), wherein a primer layer is provided between the foaming agent-containing resin layer and the picture layer. (3) The foamed wallpaper according to the above (1) or (2), wherein the thickness of the surface protective layer is within the range of 1 μm or more and 30 μm or less. (4) The foamed wallpaper according to any one of the above (1) to (3), wherein the total thickness of the base layer and the foaming agent-containing resin layer is within the range of 200 μm or more and 600 μm or less. (5) The foamed wallpaper according to any one of the above (1) to (4), wherein the foaming agent-containing resin layer is formed using a vinyl chloride resin. [Explanation of symbols]

[0054] 1...foamed wallpaper, 2...base material layer, 3...foaming agent-containing resin layer, 4...primer layer, 5...pattern layer, 6...surface protection layer, 7...embossed pattern, 8...foaming agent

Claims

1. A base layer which is a non-foamed layer, a foaming agent-containing resin layer which contains a foaming agent and is laminated on the base layer, a design layer, and a surface protective layer are laminated in this order, The design layer is formed using a water-based inkjet ink, the surface protective layer is formed containing a urethane-based resin, The foamed wallpaper is embossed from the surface protective layer side.

2. 2. The foam wallpaper according to claim 1, further comprising a primer layer between the foaming agent-containing resin layer and the pattern layer.

3. 3. The foam wallpaper according to claim 1, wherein the thickness of the surface protective layer is within a range of 1 μm to 30 μm.

4. 4. The foam wallpaper according to claim 3, wherein the total thickness of the base layer and the foaming agent-containing resin layer is within a range of 200 μm to 600 μm.

5. 5. The foam wallpaper according to claim 4, wherein the foaming agent-containing resin layer is formed using a vinyl chloride resin.

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