JP2017166081A - Foamed wallpaper and method for manufacturing foamed wallpaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a foamed wallpaper having high suitability for deep color printing.SOLUTION: A foamed wallpaper 10 includes a paper substrate 1, a foamed resin layer 2 containing an aqueous emulsion resin, a foaming agent, and an inorganic filler, a picture-printed layer 3 having a printed picture pattern, and a surface protective layer 4 containing an acrylic resin and a filler, which are sequentially laminated. The picture-printed layer 3 is supported by the surface protective layer 4, so that the density reduction due to cracks in the picture-printed layer 3 can be suppressed. Preferably, the paper substrate has a basis weight of 50 g/mor more and 100 g/mor less, and a thickness of 80 μm or more and 150 μm or less. Preferably the foamed resin layer has a basis weight of 50 g/mor more and 220 g/mor less, and an expansion ratio of 3 or more. Preferably the surface protective layer has a basis weight of 5 g/mor more and 40 g/mor less.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a foam wallpaper used for a building interior material such as a floor, a wall, and a ceiling, and a method for producing the foam wallpaper.

  Producing foamed wallpaper by cross-linking and then foaming a foamed resin layer of a laminated sheet (so-called foam wallpaper original) having at least a foamed resin layer laminated on a paper substrate (so-called wallpaper backing paper) Can do. As an example of such foamed wallpaper, Patent Document 1 discloses a foamed wallpaper having a paper base material, a resin layer, and a pattern printing layer, and improving the adhesion and surface rubbing characteristics of the pattern printing layer.

JP 2007-196590 A

  In foamed wallpaper, the thickness is often increased by using a foaming agent for the purpose of concealing the background, but this causes unevenness on the wallpaper surface, causing a load on the pattern print layer and causing cracks, resulting in a print density of May fall. For this reason, there has been a problem that it becomes a major obstructive factor especially in the printing of dark-colored patterns and is restricted in terms of design.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a foam wallpaper having high suitability for dark color printing and a method for producing the same.

In order to solve the above problems, a foamed wallpaper according to one embodiment of the present invention has a paper base, a foamed resin layer containing a water-based emulsion resin, a foaming agent, and an inorganic filler, and a printed pattern. A pattern printing layer and a surface protective layer containing an acrylic resin and a filler are sequentially laminated. And a surface protection layer supports a pattern printing layer, and suppresses the density | concentration fall by the crack of a pattern printing layer.
The paper substrate preferably has a basis weight of 50 g / m ² or more and 100 g / m ² or less and a thickness of 80 μm or more and 150 μm or less.
The foamed resin layer preferably has a basis weight of 50 g / m ^{2 to} 220 g / m ² and a foaming ratio of 3 times or more.
The surface protective layer preferably has a basis weight of 5 g / m ² or more and 40 g / m ² or less.

For example, in the method for producing foam wallpaper according to one embodiment of the present invention, plain paper having a basis weight of 50 g / m ² or more and 100 g / m ² or less and a thickness of 80 μm or more and 150 μm or less is used as the paper substrate, and EVA resin is used as the foam resin layer. A paste in which 80 parts by mass of inorganic powder is added to 100 parts by mass is applied by a coating method so that the basis weight is 50 g / m ² or more and 220 g / m ² or less, and an acrylic resin is used as a surface protective layer. m ² or more 40 g / m ² was applied by a lip coater method so become less, subjected to a heat foaming in the paper temperature 180 ° C. at the outlet of the paper temperature 0.99 ° C. and embossing heater at the outlet of the foaming furnace, passed through the embossing heater After that, the surface temperature of the foamed wallpaper immediately before the contact with the embossing roll is maintained at 160 ° C. or more and 190 ° C. or less, and the embossing pattern is pressed by the embossing roll. And then cooled and dried.

  According to one aspect of the present invention, the surface protective layer supports the pattern printing layer and does not cause a decrease in density due to cracks in the pattern printing layer, so that it is possible to produce a foam wallpaper having high suitability for dark color printing. become.

It is typical sectional drawing which shows an example of the cross-sectional shape of the foam wallpaper based on one Embodiment of this invention.

<Embodiment>
Below, with reference to drawings, the manufacturing method of the foam wallpaper based on one Embodiment of this invention is demonstrated. Here, the drawings are schematic, and the relationship between the thickness and the planar dimensions, the ratio of the thickness of each layer, and the like are different from the actual ones. Further, the embodiment described below exemplifies a configuration for embodying the technical idea of the present invention, and the technical idea of the present invention is that the material, shape, structure, etc. of the component parts are as follows. It is not something specific. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.

(Foam wallpaper)
In FIG. 1, an example of the shape of the cross section of the foam wallpaper 10 which concerns on one Embodiment of this invention is shown.
In the foam wallpaper 10 according to the present embodiment, a foamed resin layer 2, a pattern printing layer 3 provided as appropriate, and a surface protective layer 4 are laminated in this order on a paper base material 1 as a base material. Furthermore, the embossed pattern 5 is formed on the surface of the foam wallpaper 10 according to the present embodiment.

  [Paper Base Material] The paper base material 1 is a so-called wallpaper backing paper (fibrous sheet). Examples of the paper base 1 include general paper for wallpaper (pulp-based sheets sized with a known sizing agent); flame-retardant paper (pulp-based sheets such as guanidine sulfamate and guanidine phosphate) Inorganic paper containing inorganic additives such as aluminum hydroxide and magnesium hydroxide; fine paper; thin paper; fiber mixed paper (paper made by mixing pulp and synthetic fiber) .

In the present embodiment, plain paper is applicable as the paper base material 1, and the basis weight is 50 g / m ² or more and 100 g / m ² or less and the thickness is in the range of 80 μm or more and 150 μm or less. The required rigidity is ensured.

[Foamed Resin Layer] The foamed resin layer 2 is formed by applying a resin containing a foaming agent to the surface of the paper substrate 1. In the present embodiment, a foaming agent, a plasticizer, a stabilizer, a thinning agent, other organic additives, and an inorganic powder (inorganic filler) as a filler are appropriately mixed with the resin according to the intended use. The foamed resin layer 2 is provided by coating the surface of the substrate 1 in the form of a sheet or a pattern.
Examples of the resin coating method include a knife coating method, a nozzle coating method, a die coating method, a lip coating method, a comma coating method, a gravure coating method, a rotary screen coating method, and a reverse roll coating method. .

  As the resin contained in the foamed resin layer 2, a resin that can be used in the form of an aqueous emulsion, for example, a polyolefin-based resin can be used. In particular, at least an ethylene copolymer having ethylene and a component other than ethylene as a monomer is used. One type is more preferable. Furthermore, an ethylene-vinyl acetate copolymer (EVA) resin can be suitably used.

  The ethylene copolymer is suitable for extrusion film formation from the viewpoint of the melting point and MFR. Examples of the ethylene copolymer include ethylene-vinyl acetate copolymer (EVA), ethylene-methyl methacrylate copolymer (EMMA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methyl acrylate copolymer ( EMA), ethylene-methacrylic acid copolymer (EMAA), ethylene-α olefin copolymer, and the like. These ethylene copolymers can be used alone or in admixture of two or more. Among these ethylene copolymers, at least one of ethylene-vinyl acetate copolymer, ethylene-methyl methacrylate copolymer and ethylene-methacrylic acid copolymer is preferable, and when these are used in combination with other resins. The content of at least one of ethylene-vinyl acetate copolymer, ethylene-methyl methacrylate copolymer and ethylene-methacrylic acid copolymer is preferably 70% by mass or more, and more preferably 80% by mass or more.

  Moreover, as content of monomers other than ethylene contained in an ethylene copolymer, 5 to 25 mass% is preferable, for example, and 9 to 20 mass% is more preferable. By adopting such a copolymerization ratio, the extrusion film forming property is further enhanced. As a specific example, the ethylene-vinyl acetate copolymer has a vinyl acetate copolymerization ratio (VA amount) of preferably 9% by mass to 25% by mass, and more preferably 9% by mass to 20% by mass. The ethylene-methyl methacrylate copolymer has a methyl methacrylate copolymerization ratio (MMA amount) of preferably 5% by mass to 25% by mass, and more preferably 5% by mass to 15% by mass. The ethylene-methacrylic acid copolymer has an acrylic acid copolymerization ratio (MAA amount) of preferably 2% by mass or more and 15% by mass or less, and more preferably 5% by mass or more and 11% by mass or less.

  Here, the resin contained in the foamed resin layer 2 is, for example, an MFR (melt flow rate) measured at 190 ° C. and a load of 21.18 N described in JIS K 6922 of 10 g or more and 10 g or less (10 g) per 10 minutes. / 10 minutes or more and 100 g / 10 minutes or less). When the MFR is in the above range, the temperature rise when forming the foamed resin layer 2 by extrusion film formation is small, and the film can be formed in a non-foamed state. It can be printed on any surface and there are few patterns missing. If the MFR is too large, the resin is too soft, so that the formed foamed resin layer 2 may have insufficient scratch resistance.

In addition, as the foaming agent contained in the foamed resin layer 2, it is possible to use a foaming agent that is commonly used for foamed wallpaper, and in particular, a thermally expandable microcapsule foaming agent has performance (foaming ratio, From the viewpoint of (strength). In addition, azo, hydrazide, nitroso, etc. can be used.
The amount of the foaming agent added depends on the thickness of the foamed resin layer 2 and the foaming ratio (volume expansion coefficient before and after foaming), for example, 1 to 20 parts by mass with respect to 100 parts by mass of the resin, Preferably it is about 5 to 15 parts by mass.
Incidentally, the expansion ratio and basis weight of the foamed resin layer 2, by the basis weight of 50 g / m ² or more 220 g / m ² or less and more than three times expansion ratio, sufficient voluminous to obtain uneven surface hiding property In addition to having excellent surface strength, the uneven shape of the embossed pattern 5 described later can also be reproduced sharply.

Examples of the inorganic powder contained in the foamed resin layer 2 include calcium carbonate, aluminum hydroxide, magnesium hydroxide, silica sand, talc, silicas, magnesium silicate, zinc borate, and titanium dioxide. The inorganic powder is added in an amount of 50 to 150 parts by mass with respect to 100 parts by mass of the resin.
Thus, the foamed resin layer 2 according to the present embodiment is formed of a resin composition containing an aqueous emulsion resin, a foaming agent, and an inorganic filler.

  [Pattern Print Layer] The pattern print layer 3 imparts design properties to the foamed wallpaper 10. The pattern print layer 3 can be formed, for example, by printing a pattern on the surface of the foamed resin layer 2. The thickness of the pattern print layer 3 is different from the type of the pattern, but is generally preferably about 0.1 μm to 10 μm.

  Examples of the design pattern include a wood grain pattern, a stone pattern, a grain pattern, a tiled pattern, a brickwork pattern, a cloth pattern, a leather pattern, a geometric figure, a character, a symbol, and an abstract pattern. The pattern can be selected according to the purpose.

  Examples of the pattern pattern printing technique include gravure printing, flexographic printing, silk screen printing, and offset printing. As the printing ink, for example, a printing ink containing a colorant, a binder resin, and a solvent can be used. These inks may be known or commercially available.

As the colorant, for example, a pigment can be appropriately used. The pigment includes an inorganic pigment and an organic pigment. Inorganic pigments include, for example, titanium oxide, zinc white, carbon black, black iron oxide, yellow iron oxide, yellow lead, molybdate orange, cadmium yellow, nickel titanium yellow, chrome titanium yellow, iron oxide (valve), and cadmium. Examples thereof include red, ultramarine blue, bitumen, cobalt blue, chromium oxide, cobalt green, aluminum powder, bronze powder, titanium mica, and zinc sulfide. Examples of the organic pigment include aniline black, perylene black, azo (azo lake, insoluble azo, condensed azo), polycyclic (isoindolinone, isoindoline, quinophthalone, perinone, flavantron, anthrapyrimidine, anthraquinone, Quinacridone, perylene, diketopyrrolopyrrole, dibromoanthanthrone, dioxazine, thioindigo, phthalocyanine, indanthrone, halogenated phthalocyanine). The content of the colorant is preferably about 10 to 50 parts by mass, more preferably about 15 to 30 parts by mass with respect to 100 parts by mass of the resin.
Further, when the foamed resin layer 2 serves as a solid layer for the pattern print layer 3 or when the foamed resin layer 2 is applied in a pattern pattern, the foamed resin layer 2 may also contain a colorant. good.

  Binder resin can be set according to the kind of lower layer resin which forms the pattern printing layer 3. FIG. Examples of the binder resin include acrylic resin, styrene resin, polyester resin, urethane resin, chlorinated polyolefin resin, vinyl chloride-vinyl acetate copolymer resin, polyvinyl butyral resin, alkyd resin, petroleum Resin, ketone resin, epoxy resin, melamine resin, fluorine resin, silicone resin, fiber derivative, rubber resin and the like.

  Examples of the solvent (or dispersion medium) include petroleum organic solvents such as hexane, heptane, octane, toluene, xylene, ethylbenzene, cyclohexane, and methylcyclohexane; ethyl acetate, butyl acetate, 2-methoxyethyl acetate, and acetic acid-2 -Ester-based organic solvents such as ethoxyethyl; alcohol-based organic solvents such as methyl alcohol, ethyl alcohol, normal propyl alcohol, isopropyl alcohol, isobutyl alcohol, ethylene glycol, propylene glycol; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone Organic solvents; ether organic solvents such as diethyl ether, dioxane, tetrahydrofuran; dichloromethane, carbon tetrachloride, trichloroethylene, tetrachloroethylene, etc. Chlorinated organic solvents; water, and the like. These solvents (or dispersion media) can be used alone or in the form of a mixture.

  In the present embodiment, the pattern printing layer 3 uses a printing ink (non-foaming ink) and / or a foaming ink whose main component is an aqueous emulsion resin, a foaming ink whose main component is a vinyl chloride paste resin, or the like. And a gravure printing method, a screen printing method, a flexographic printing method and the like.

In the case where the pattern printing layer 3 is not formed on the foamed resin layer 2, an undercoat layer (primer layer) may be formed as an alternative to the pattern printing layer 3. The undercoat layer includes a polyolefin resin, an acrylic resin, a polyvinyl alcohol resin, and the like, and the basis weight after drying is desirably 1 g / m ² or more and 3 g / m ² or less.

  [Surface Protective Layer] The surface protective layer 4 is formed on the surface of the picture print layer 3 with the intention of adjusting the gloss and / or protecting the picture print layer 3. The thickness of the surface protective layer 4 is not limited, but is preferably about 0.1 μm to 15 μm. Here, the kind of the surface protective layer 4 is not limited. If it is the surface protective layer 4 aiming at gloss adjustment, there exists the surface protective layer 4 containing known fillers, such as a silica, for example. As a method for forming the surface protective layer 4, for example, a known method such as gravure printing can be employed. In addition, when the adhesiveness of the pattern printing layer 3 and the surface protection layer 4 is not fully acquired, the surface protection layer 4 can also be provided after carrying out the adhesion process (primer process) of the surface of the pattern printing layer 3 easily. . When the surface protective layer 4 is formed for the purpose of surface strength (scratch resistance, etc.), contamination resistance, protection of the picture printing layer 3 and the like of the foam wallpaper 10, the one containing an ionizing radiation curable resin as a resin. Is preferred. As the ionizing radiation curable resin, for example, those that undergo radical polymerization (curing) by electron beam irradiation are preferable.

  In the present embodiment, the surface protective layer 4 is formed on the pattern printing layer 3, and a layer mainly composed of an aqueous emulsion resin is formed using a gravure printing method, a knife coating method, a nozzle coating method, a die coating method, a lip coating. It is formed by a coating method, a comma coating method or the like.

Examples of the resin contained in the surface protective layer 4 include polyolefin resins, acrylic resins, polyvinyl alcohol resins, fluorine resins, and the like, and acrylic resins are particularly preferable. These resins may be used alone or in combination of two or more. Moreover, when using resin which can be bridge | crosslinked for formation of the surface protective layer 4, you may perform a crosslinking process to the said resin as needed. The basis weight after drying of the surface protective layer 4 is preferably 5 g / m ² or more and 40 g / m ² or less, preferably 15 g / m ² or more and 30 g / m ² or less.

Further, a filler is added to the resin contained in the surface protective layer 4 as a matting agent (gloss adjusting agent). As the matting agent, for example, silica particles, alumina (α-alumina, etc.), inorganic particles such as calcium carbonate, barium sulfate, kaolinite, aluminosilicate, or organic particles such as polycarbonate, nylon, urethane resin are used. be able to.
Thus, the surface protective layer 4 according to the present embodiment contains an acrylic resin and a filler.

[Embossed pattern]
The surface of the surface protective layer 4, which is the outermost layer of the foam wallpaper 10, is embossed (unevenness embossing using an embossed plate), and the embossed pattern 5 is shaped (given). In embossing, for example, the foam wallpaper 10 is passed between an emboss roll having a recess having a depth of 15 μm or more and a rubber back roll having a hardness of 50 degrees or more and less than 90 degrees to form an uneven shape on the foam wallpaper 10. You may make it give. As a method for measuring hardness, for example, JIS K-6301 A type can be used. Examples of the embossed pattern include a wood grain plate conduit groove, a stone plate surface unevenness, a cloth surface texture, a satin texture, a grain texture, a hairline, and a multiline groove.

  In addition, as a method of forming an uneven shape on the surface of the surface protective layer 4, there are other methods such as a method of partially foaming with a foam suppression ink and a chemical embossing method of partially heating and foaming with hot air or infrared rays. In particular, mechanical embossing by pressure contact with an embossing roll is preferable because sharp unevenness can be obtained with respect to the foamed resin layer 2. Moreover, it is desirable to maintain the surface temperature of the foamed wallpaper 10 immediately before the contact of the embossed plate in the embossing process between 160 ° C. and 190 ° C., preferably between 170 ° C. and 180 ° C.

As described above, the foamed wallpaper 10 according to the present embodiment includes the foamed resin layer 2 made of the resin composition containing the water-based emulsion resin, the foaming agent, and the inorganic filler on the paper substrate 1, and the printed pattern. A pattern printing layer 3 having a pattern and a surface protective layer 4 containing an acrylic resin and a filler are laminated.
In the foam wallpaper 10 according to the present embodiment, the surface protective layer 4 supports the picture print layer 3 and suppresses a decrease in density due to cracks in the picture print layer 3.

Examples of the present embodiment and comparative examples are shown below. In addition, this embodiment is not limited to the following Example.
[Example 1]
Plain paper (KJ Special Paper Co., Ltd .: “WK685AP”) having a basis weight of 85 g / m ² and a thickness of 130 μm is used as the paper substrate 1, and EVA resin (manufactured by Sumika Chemtex: “S-7400”) as the foamed resin layer 2. HQ) ") A paste obtained by adding 80 parts by mass of inorganic powder (inorganic filler) to 100 parts by mass is applied by a coating method so that the basis weight of the resin layer is 100 g / m ^2, and then the surface protective layer 4, an acrylic resin (DIC Corporation: “ATC-354”) was applied by a lip coater method so that the basis weight of the protective layer was 20 g / m ^2, and the paper surface temperature at the outlet of the foaming furnace was 150 ° C. Foaming is performed at a paper surface temperature of 180 ° C. at the exit of the embossing heater, and after passing through the embossing heater, the surface temperature of the foamed wallpaper 10 immediately before contact with the embossing roll is set to 160 ° C. or more and 190 ° C. Maintained below, at an embossing roll under pressure carried out applying the embossed pattern 5, then cooled and dried to create a foam wallpaper Example 1.

[Example 2]
Plain paper (KJ Special Paper Co., Ltd .: “WK685AP”) having a basis weight of 85 g / m ² and a thickness of 130 μm is used as the paper substrate 1, and EVA resin (manufactured by Sumika Chemtex: “S-7400”) as the foamed resin layer 2. HQ) ") A paste in which 80 parts by mass of inorganic powder (inorganic filler) is added to 100 parts by mass is applied by a coating method so that the basis weight of the resin layer is 100 g / m ^2, and then the pattern printing layer After performing pattern printing by gravure printing using water-based ink as 3, acrylic resin (DIC Corporation: “ATC-354”) is used as the surface protective layer 4 and the basis weight of the protective layer is 20 g / m ^2. It is applied by the lip coater method so that it is heated and foamed at a paper surface temperature of 150 ° C. at the outlet of the foaming furnace and a paper surface temperature of 180 ° C. at the outlet of the emboss heater, and passes through the emboss heater. Thereafter, the surface temperature of the foamed wallpaper 10 immediately before the contact of the embossing roll is maintained at 160 ° C. or more and 190 ° C. or less, the embossing roll 5 is pressurized to give the embossed pattern 5, and then cooled and dried. Created foam wallpaper.

[Comparative Example 1]
Plain paper (KJ Special Paper Co., Ltd .: “WK685AP”) having a basis weight of 85 g / m ² and a thickness of 130 μm is used as the paper substrate 1, and EVA resin (manufactured by Sumika Chemtex: “S-7400”) as the foamed resin layer 2. HQ) ") A paste in which 80 parts by mass of inorganic powder (inorganic filler) is added to 100 parts by mass is applied by a coating method so that the basis weight of the resin layer is 100 g / m ² . Heat foaming was performed at a paper surface temperature of 150 ° C. at the outlet and a paper surface temperature of 180 ° C. at the outlet of the emboss heater, and the foamed wallpaper of Comparative Example 1 was prepared by cooling and drying.

[Comparative Example 2]
No acrylic resin was applied as the surface protective layer 4 (the surface protective layer 4 was removed), and the paper surface temperature at the exit of the emboss heater was 160 ° C. Otherwise, the foamed wallpaper of Comparative Example 2 was prepared in the same manner as in Example 2.

  That is, unlike the foamed wallpaper of Examples 1 and 2, the foamed wallpaper of Comparative Examples 1 and 2 does not have the surface protective layer 4.

[Evaluation method]
The hue of the specimen before foaming and after foaming or after foaming / embossing was measured with a color difference meter, and the color difference ΔE before and after foaming was calculated and compared.
Here, “L ^* a ^* b ^* color system” (JIS Z8729) is adopted as a color difference measurement method, and a color difference meter “CR-310 (caliber 50 mm)” (manufactured by Konica Minolta Co., Ltd.) as a tester; A data processor (DATA PROCESSOR) “DP-300” was used.
The evaluation criteria are as follows.
○ (Pass): Color difference ΔE is less than 3.0 (ΔE <3.0)
X (failure): Color difference ΔE is 3.0 or more (ΔE ≧ 3.0)
[Evaluation results]
The evaluation results are shown in Table 1 below.

For the foamed wallpaper of Example 1, the color difference ΔE was 2.8. The foamed wallpaper of Example 2 had a color difference ΔE of 2.0. That is, for the foamed wallpaper of Examples 1 and 2, since the color difference ΔE was less than 3.0, the overall evaluation was acceptable.
For the foamed wallpaper of Comparative Example 1, the color difference ΔE was 4.0. The foamed wallpaper of Comparative Example 2 had a color difference ΔE of 3.5. That is, for the foamed wallpaper of Comparative Examples 1 and 2, since the color difference ΔE was 3.0 or more, the overall evaluation was rejected.
Therefore, it was confirmed that the foamed wallpaper of Examples 1 and 2 was superior to the foamed wallpaper of Comparative Examples 1 and 2 in terms of suppressing the color difference before and after foaming of the foamed wallpaper. Accordingly, it was found that in the foam wallpaper, it is effective in terms of suppressing the color difference before and after foaming of the foam wallpaper that the surface protective layer supports the pattern printing layer in the configuration as in this embodiment.

  The foam wallpaper according to the present embodiment can be used for wall decorations of buildings such as detached houses, apartment houses, stores, office buildings and the like.

  While the present invention has been described with reference to specific embodiments, it is not intended that the invention be limited by these descriptions. From the description of the invention, other embodiments of the invention will be apparent to persons skilled in the art, along with various variations of the disclosed embodiments. Therefore, it is to be understood that the claims encompass these modifications and embodiments that fall within the scope and spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Paper base material 2 ... Foamed resin layer 3 ... Pattern printing layer 4 ... Surface protective layer 5 ... Embossed pattern 10 ... Foam wallpaper

Claims (3)

A paper substrate;
A foamed resin layer containing an aqueous emulsion resin, a foaming agent, and an inorganic filler;
A pattern printing layer having a pattern by printing;
A surface protective layer containing an acrylic resin and a filler;
Are sequentially stacked,
A foamed wallpaper, wherein the pattern printing layer is supported by the surface protective layer, and density reduction due to cracking of the pattern printing layer is suppressed. The paper substrate has a basis weight of 50 g / m ^{2 to} 100 g / m ² and a thickness of 80 μm to 150 μm,
The foamed resin layer has a basis weight of 50 g / m ² or more and 220 g / m ² or less and an expansion ratio of 3 times or more,
The foamed wallpaper according to claim 1, wherein the surface protective layer has a basis weight of 5 g / m ² or more and 40 g / m ² or less. A plain paper having a basis weight of 50 g / m ² or more and 100 g / m ² or less and a thickness of 80 μm or more and 150 μm or less is used as a paper substrate.
As a foamed resin layer, a paste in which 80 parts by mass of inorganic powder is added to 100 parts by mass of ethylene-vinyl acetate copolymer resin is applied by a coating method so that the basis weight is 50 g / m ² or more and 220 g / m ² or less. ,
Perform pattern printing by gravure printing using water-based ink as a pattern printing layer,
As a surface protective layer, an acrylic resin is applied by a lip coater method so that the basis weight is 5 g / m ² or more and 40 g / m ² or less,
Heat foaming at a paper surface temperature of 150 ° C. at the outlet of the foaming furnace and a paper surface temperature of 180 ° C. at the outlet of the emboss heater,
After passing through the embossing heater, the surface temperature of the foamed wallpaper immediately before the contact of the embossing roll is maintained at 160 ° C. or more and 190 ° C. or less,
Applying an embossed pattern by applying pressure with the embossing roll,
A method for producing foamed wallpaper, which is then cooled and dried.

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