JPH02274528A - Manufacture of sheet form article - Google Patents

Abstract

PURPOSE:To enhance moisture-proofing property and moisture-absorbing and releasing properties of a sheet form article by providing a resin layer on a flameproof paper, and using a foamable synthetic resin layer for forming each of a base layer and a pattern layer of a finished product. CONSTITUTION:A resin layer 2 comprising a thermoplastic synthetic resin as a main constituent is provided on a flameproof paper 1 to obtain a sheet form article. The sheet form article is laminated with a non-woven fabric 3 comprising wood fibers or the like to produce a substrate, on which is layered a first foamable synthetic resin 4 containing a particulate water-absorptive high molecular weight material and a foaming agent for producing numerous open cells upon foaming by heating. On the first foamable synthetic resin layer is provided a second foamable synthetic resin 5 containing a similar foaming agent and provided with a color which is the same or different from the color of the first foamable resin layer 4. Then, the foamable resins 4, 5 are heated for foaming, to obtain a desired sheet form article which comprises a base layer constituting a recessed foamed layer and a pattern layer constituting a projected foamed layer.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method for manufacturing a sheet-like material used as a wall covering material. Known methods for imparting a moisture effect or a moisture permeability effect can be broadly classified into the following three methods. That is, as disclosed in JP-A-56-3302, a water-absorbing polymer is mixed into the synthetic resin layer, and the other method is as disclosed in JP-A-53-317.
As shown in Japanese Patent Laid-open No. 72, one method is to form a foamed layer having countless interconnected fine cells, and the other is as described in Japanese Patent Application Laid-Open No. 53-38102.

The goal is to provide moisture permeability with the olefin-based microporous sheet. In addition, mechanical punching process, in which fine holes are made using a cloth roll, can be used to ensure breathability and moisture permeability, and fibers can be immersed in synthetic resin to improve their moisture absorption and release properties. It was being used.

<Problems to be solved by the invention> These decorative materials are mainly used as interior wall covering materials, and their moisture absorption and moisture permeability functions are mainly intended to prevent dew condensation. That is.

However, although these decorative materials are designed to be effective against surface condensation, considering their structure,
It must be said that this actually has a negative effect on condensation inside the wall. In other words, because its structure is designed with only moisture absorption and desorption properties and moisture permeability in mind, it does not have a moisture-proofing function, and if used as a base material for a highly moisture-permeable material such as gypsum board, it will not work indoors. The generated water vapor enters between the inner and outer walls through the interior materials and becomes a major cause of condensation inside the walls.

This can be seen in the fact that today's housing complexes are becoming more airtight5 and gypsum boards are often used as interior wall materials. It is difficult to say, and its range of use is also limited.

In addition, these interior materials are usually mechanically embossed,
Although a concavo-convex pattern was provided, when this concavo-convex pattern was formed, the moisture absorption/desorption or moisture permeability effect was significantly impaired, and the desired function could not be exhibited.

In the method of mixing water-absorbing polymers into the synthetic resin layer, only the water-absorbing polymers exposed on the surface absorb and release moisture. The exposed area of the water-absorbing polymer that was exposed on the surface became narrow, or in the case of crumpled edges, it was crushed and the original moisture absorption and release effect could not be expected.

In addition, when a foamed layer with countless interconnected microscopic cells is mechanically embossed to ensure the design, the foamed synthetic resin layer melts during the 5-step embossing process, resulting in interconnected microscopic cells. In addition to the air bubbles disappearing, the mechanical pressure during embossing crushed the communicating fine air bubbles in the open areas, so that the desired moisture permeability effect could not be obtained.

Even if a microporous olefin fiber sheet is used to provide moisture permeability, if mechanical embossing is applied to create a design, the heating during embossing may melt and close the micropores in the sheet, or the micropores may close in the recesses. They were crushed, again significantly impairing the desired humidification effect.

Even when punching is used, the holes may become clogged during embossing, or the holes can only be made larger than chemical microbubbles, which may impair the design, or dirt may adhere to the holes made by the clothing. It had drawbacks such as:

In addition, when Ia fibers are embedded in synthetic resin, most of the fibers are covered with synthetic resin, so the moisture absorption and desorption properties of the fibers are not utilized, and as a result, they are not effective. It was put away.

Means for Solving the Problems> Therefore, the present invention forms a resin layer mainly composed of thermoplastic synthetic resin on flame-retardant paper (base paper for wallpaper) in order to provide moisture-proofing properties. A foamable synthetic resin layer containing a water-absorbing polymer and a foaming agent that creates countless interconnected micro-cells after heating and foaming is used in the final product to form a base layer that forms a concave foam layer and a convex foam layer. The present invention provides a method for producing a sheet-like article having excellent moisture-proofing properties and moisture-absorbing/releasing properties by combining the two pattern layers.

Furthermore, the present invention provides a professional cloth layer made of wood fibers, vegetable fibers, and synthetic fibers alone or in a mixture between the thermoplastic synthetic resin layer having moisture-proofing properties and the foam layer serving as the base layer having moisture-absorbing and releasing properties. This is aimed at improving the design and increasing moisture absorption.Furthermore, by forming a moisture-permeable resin film on the concave foam layer and the convex foam layer, moisture absorption can be improved. To provide a method for producing an excellent sheet-like product that does not impair the moisture release effect and also has the effect of preventing seepage of sewage.

In addition, the conventional technology had a disadvantage in that the moisture absorption and desorption effect of the open portion was poor, but according to the method of the present invention, the open portion also has an extremely excellent moisture absorption and desorption function, and furthermore, both the open portion and the painted portion are foamed. Because it is formed in layers, it has heat insulation and sound insulation effects, and any design pattern can be created without mechanical embossing, and the pattern formation has no negative effect on the moisture absorption and release effect. Accordingly, it is possible to provide a method for manufacturing a sheet-like product that is inexpensive.

The present invention provides the t11 sheet-like product in which a resin layer mainly composed of thermoplastic synthetic resin is laminated on flame-retardant paper (base paper for wallpaper).
A base material made by laminating a nonwoven fabric made of wood T fibers, vegetable fibers, and synthetic A fibers singly or in a mixture on a fat layer.A fine powder of water-absorbing polymer and a countless number of interconnected fine cells after heating and foaming are added to the base material. A first foamable synthetic resin containing a foaming agent that creates open cells is laminated on the entire surface, and then the first foamable synthetic resin is laminated on the entire surface.
The first foamable synthetic resin layer is colored in the same or different color as the first foamable synthetic resin layer, which also contains a water-absorbing polymer and a foaming agent that creates countless interconnected microscopic cells after heating and foaming. After forming at least one second foamable synthetic resin into an arbitrary pattern, the first and second foamable synthetic resins are heated and foamed to form a foam that has moisture-proofing and moisture-absorbing and desorbing functions. The structure is such that an uneven pattern appears.

In addition, by forming a moisture-permeable resin film on the first and second foamable synthetic resin layers J-, if necessary, it is possible to prevent sewage from seeping in without impairing the moisture absorbing and releasing function. : It is also possible to do this.

To explain in more detail below, the flame retardant paper used is a commonly used base paper for wallpaper.

A resin layer containing a thermoplastic synthetic resin as a main component is laminated on this flame-retardant paper as a moisture-proof layer, and the lamination method is a known lamination method such as a coating method, a calendering method, or a laminating method. Further, any thermoplastic synthetic resin can be used as long as it has extremely low moisture permeability, and vinyl chloride resin, vinylidene chloride resin, polyethylene, polyurethane, etc. are preferable.

Next, a nonwoven fabric made of wood fibers, vegetable fibers, and synthetic fibers alone or in combination is laminated on the thermoplastic synthetic resin layer, and the lamination method is mainly used.

In addition, the materials used for the non-woven fabric include wood fibers such as wood fibers, cotton fibers, hemp 2 synthetic fibers such as rayon, acrylic, polyvinyl chloride, polyester, vinylon, etc. But each fiber is jP,
Whether to use them alone or in combination depends on the purpose. Especially when selecting synthetic fibers,
It is necessary to consider the adhesion between the thermoplastic synthetic resin used as the moisture-proof layer and the thermoplastic synthetic resin used for the foamable synthetic resin layer described later, and thermal bonding is preferable in terms of cost and workability. For example, when vinyl chloride resin is used as the thermoplastic synthetic resin, acrylic fiber or polyvinyl chloride [' is suitable as the synthetic fiber.

In the present invention, the purpose of using the nonwoven fabric is to improve the design and increase moisture absorption. Therefore, for boat fishing, it is preferable to use wood fiber TP or a mixture of wood fiber and synthetic fiber.

The reason why it is used for the purpose of improving design and increasing moisture absorption is as follows.

Generally, thermoplastic synthetic resins used for wallpaper as interior materials are mainly vinyl chloride resins, and vinyl chloride resins always incorporate plasticizers into their formulations. This plasticizer imparts flexibility to vinyl chloride resin and is indispensable, but on the other hand, it is known to be the main cause of creating stickiness and gloss, which deteriorates the design. In particular, the basic design of most wallpapers is to eliminate the luster on the surface, and surface treatments are used to achieve this goal. When using a nonwoven fabric as in the present invention,
For example, if a valve made of wood ta fiber alone or a mixture of a valve and a synthetic fiber vinyl chloride 9a is used as the nonwoven fabric, and a foamable vinyl chloride resin containing a plasticizer is laminated on the nonwoven fabric and then heated and foamed, It was confirmed that a part of the plasticizer in the expandable vinyl chloride resin was absorbed by the nonwoven fabric, and the foam layer formed after heating and foaming had a less glossy surface and less stickiness than when nonwoven fabric was not used. . This is because the amount of plasticizer in the formed foam layer is reduced compared to when nonwoven fabric is not used, and the design is thereby improved.

In addition, the present invention provides moisture absorption and desorption properties using a foam layer formed by heating and foaming a foamable synthetic resin containing a water-absorbing polymer and a foaming agent that creates countless interconnected microscopic cells after heating and foaming. However, the moisture absorption amount of this foamed stone alone cannot reach the moisture absorption amount that is the original purpose.The original purpose of the moisture absorption and release function, which is a feature of the present invention, is to prevent dew condensation as with the conventional products mentioned above. One of its purposes is to provide a humidity control function to the living space.

Humidity control function is to reduce humidity (relative humidity) changes in the living space, thereby creating a better living environment.6 The ability of humidity control function is mainly to reduce humidity (relative humidity)
This value is determined by the numerical value of the moisture absorption rate, and the numerical value has been determined from numerous experiments by the present inventors.
It was found that when left for 00 hours, a moisture absorption amount of 100 g/m' or more is required. This 1oog,/m
``In order to provide a synthetic resin layer with a moisture absorption amount above, it is necessary to use a large amount of an expensive water-absorbing polymer, which results in a very expensive product. By providing this, it was possible to compensate for the lack of moisture absorption m in the synthetic resin layer at low cost.

For the purpose of hygroscopicity, it is preferable to use wood fiber as the main component of the nonwoven fabric, but since the valve is short MiwE, its strength is low, and its heat resistance is poor, so it is more appropriate to mix synthetic IaI male. 6 Synthetic fibers are The selection depends on the type of thermoplastic synthetic resin used as the moisture barrier layer and the thermoplastic synthetic resin used in the foamable synthetic resin layer (described later).
As the a-fiber, polyvinyl chloride or acrylic is preferred. In addition, when mixing the valve and synthetic fiber, the mixing ratio of the valve is preferably 40 to 70% in consideration of moisture absorption and physical properties.

A water-absorbing polymer in the form of fine powder and heat-foaming are applied to a base material made by laminating a nonwoven fabric on the moisture-proof thermoplastic synthetic resin layer described above by a known lamination method such as a coating method, a calendar method, or a lamination method. Then, a first foamable synthetic resin layer containing a foaming agent that creates countless interconnected microscopic cells is formed over the entire surface. As the resin used for this first foamable synthetic resin layer, any resin including heat foamable vinyl chloride resin can be used.

The water-absorbing polymer itself is a well-known hydrophilic resin that can absorb water and expand, and it is desirable that it has the ability to absorb 50 times or more of its own weight of pure water. As a polymer.

Examples include starch/sodium acrylate graft copolymer vinyl ester/oxide of ethylenically unsaturated carboxylic acid or its derivative, polyacrylic acid seeder crosslinked product, polyvinyl alcohol/acrylate craft copolymer, and the like.

Commercially available products include Sumikagel-8P (Sumitomo Chemical), Sunwet rM-300 (Sanyo Chemical) Aqua Keep 4
S (steel manufacturing chemical industry products), etc.

These water-absorbing polymers usually have a particle size of 350μ to 0.5μ.
! Although it is a fine powder of about μ in size, an average particle size of 100 μ or less is preferable in consideration of dispersibility. The number of parts added is usually 2~
40 parts, but preferably 5 to 15 parts in terms of cost.
It is before and after the section.

The foaming agent contained in the first foamable synthetic resin described above is
It is preferable to have an open cell ratio of 70% or more in the state after heating and foaming in order to maximize moisture absorption and desorption performance. Adjustment of the ratio can be achieved by adjusting the mixing ratio of the foaming agent for forming closed cells and the foaming agent for forming open cells, adjusting the foaming speed by selecting a stabilizer, or adjusting the foaming heating temperature and foaming heating time. , the above-mentioned JP-A-53-31772 discloses a combination of a foaming agent (UNIFORM AZ-F Otsuka Pharmaceutical) and a stabilizer (Stabilizer F Kyodo Products), a foaming agent (ONIFINE MO Daijin Pharmaceutical) and an optional stabilizer. There are examples of combinations with agents. In the case of the present invention, these materials can also be used, and in the case of vinyl chloride resin, ordinary azosica-bonamide is often used.

After laminating the first foamable synthetic resin on the entire surface of the base material, 5
Furthermore, a second foamable synthetic resin paint is formed on top of it in an arbitrary pattern using a known coating printing method such as a rotary screen printing method or a gravure textile printing method. The foamable synthetic resin layer is dried and semi-gelled.

This second foamable synthetic resin also contains a water-absorbing polymer having the same or similar performance as that contained in the first foamable synthetic resin, and a foaming agent that creates fine cells that communicate with each other in the number of heat foaming treatments. However, the second foamable synthetic resin applied in a pattern may be colored the same or different color from the first foamable synthetic resin.

Further, this second foamable synthetic resin may be of a single color, or may have a multicolor pattern from the viewpoint of aesthetic effect and design.

When the first foamable synthetic resin is in the form of a base paint and is laminated on the base H by a coating method, the first foamable synthetic resin paint may be used as it is or by adding a coloring pigment to the base H. It is also possible to substitute the second foamable synthetic resin paint, but in general, in the case of the rotary screen printing method or gravure textile printing method in which the second foamable synthetic resin paint is formed into a pattern, the depth of the printing plate and the mesh will vary. Paint viscosity needs to be adjusted. or.

By incorporating a considerable amount of filler into the first foamable synthetic resin, it is possible to reduce costs and improve the flame retardancy of wallpaper, etc. However, in the case of rotary screen printing and gravure textile printing, Since it is not possible to incorporate the filler into the first foamable synthetic resin due to problems such as blurring, clogging, and viscosity during coating printing, it is preferable to separate the filler if possible.

After the first foamable synthetic resin is laminated on the entire surface of the base material and the second foamable synthetic resin is formed on top of it in a pattern, a moisture permeable resin film is formed as necessary. However, the formation method may be to apply a moisture-permeable resin paint by a coating method, to apply a surface treatment using a gravure printing machine, or to laminate a moisture-permeable resin film that has been previously formed.

Moisture-permeable resins include, for example, urethane-based W10 emulsion resins, amino acid/methacrylic acid/urethane copolymers, and microporous sheets of the above-mentioned olefin-based resins. In order not to lose the performance of the wet resin and also to prevent the seepage of cleaning waste water that is wiped off when it becomes dirty when used as a wall covering material, water is allowed to pass through only in the form of double air, but not in liquid form. Although a permeable amino acid/methacrylic acid/urethane copolymer is preferred, other moisture permeable resins with equivalent functionality can also be used.

Now, the first foamable synthetic resin is laminated on the moisture-proof base material, and a second foamable synthetic resin layer is further formed in a pattern on top of the first foamable synthetic resin layer, and if necessary, the first and second foamable synthetic resin layers are laminated. After forming a moisture-permeable resin film on the foamable synthetic resin layer, this is heated and foamed in a foam heating furnace to create a foamed uneven pattern to create a sheet-like material with excellent moisture resistance and moisture absorption and release properties. It's something you get.

In the sheet-like article of the present invention having this uneven pattern, a moisture-proof layer is formed between the flame retardant paper and the nonwoven fabric layer, and not only the convex portions but also the concave portions are foamed in the moisture-absorbing and desorbing portions. There are countless interconnected microbubbles in both the upper and lower parts, and the water-absorbing polymer is evenly mixed therein, and if necessary, a moisture-permeable resin film is applied to the surfaces of the convex and concave parts. It is being formed.

<Effects of the Invention> According to the manufacturing method of the present invention, a sheet-like article having excellent moisture-proofing properties and moisture-absorbing/releasing properties can be obtained, and the performance evaluation of moisture-proofing properties and moisture-absorbing/releasing properties can be determined as follows.

Generally, the moisture permeability value can be used as a criterion for determining moisture resistance. The method for measuring moisture permeability is J.
[5-Z-0208C cup method] The purpose of imparting a moisture-proof function to wallpaper as an interior material is mainly to prevent condensation inside the wall. In this case, the inventor has conducted many experiments and found that if the moisture permeability is 50 g/m"・24 hr or less, water vapor generated indoors will enter the outer and inner walls through the wallpaper and cause condensation inside the walls. It was found that there are very few
According to the manufacturing method of the present invention, the moisture permeability is 50 g/m"・24
It can be made less than hr, and is ・1・φ.

2. As a method for measuring moisture absorption, JIS-Z-210
5-1969. To measure the moisture absorption of wall covering materials,
Using this as a reference, an effective experimental method is to encapsulate wall covering material in an air system whose humidity has been adjusted to 40°C and 97% RH for 100 hours. In addition, cauldron calibration, [Research on the humidity control effect of wall coverings (humidity control characteristics of various wall coverings)] Wall Covering Materials Association, Japan Housing and Wood Technology Center (19871) The measurement method is proposed as follows.

In this measurement method, a sample with wall covering material attached to the inner wall base is enclosed in a sealed stainless steel box, and a constant temperature change is applied to the sample to determine the humidity change. From the results of this measurement, the humidity control performance value (
b) is calculated and evaluated. This humidity control performance value (b) represents the magnitude of the slope of the logarithmic value of the temperature and the measured absolute humidity, and is given by the following formula.

T = a + log h X b = (1) T:
Temperature [''C], a: Intercept value, b: Humidity control performance value, h: Absolute humidity [g/13] H=h/h, X 100...
・(2) h s = 4.98x 10'・otast
・・・・・・・・・・・・(3) hs, saturated water vapor pressure [Pa
] , H: Relative humidity [%RH] Also, from equations (1), (2), and (3), equation (4) can be obtained.

1ogH= (b −0,0269) X T +
C--(4) C: Intercept value The absolute humidity of a sealed system in which no humidity control is performed is constant regardless of changes in temperature. Here and now, 2I! l humidity value o
By substituting (b.0) into equation (4) and introducing it into equations (2) and (3), equation (5), which shows that the absolute humidity is constant, can be derived.

1ogh=C (5) In other words, if the indoor humidity is not controlled at all, the humidity control value becomes O.

On the other hand, if the humidity is completely controlled, the initial relative humidity will always be constant regardless of changes in temperature. Now, set the humidity control value as 0.0269 (b=0.02691 (4
) Substituting into equation (6) shows that the relative humidity is constant.

1ogH=c・・・・・・・・・・・・・・・(6) In other words, when the humidity is completely controlled, the humidity control value is 0.0269
It becomes.

When the moisture absorption, moisture permeability, and moisture control values of various wall covering materials were measured using the method shown above, the moisture permeability was 50 g/m2.
If it is 24hr or less, the amount of moisture absorption is +oog/m2・100
Humidity control performance is indicated if the HR is higher than that, and the b value (x
1oo-') was 100 or more. Moreover, a wall covering material suitable for this condition could not be found among conventional products. In other words, conventional wall covering materials that have excellent moisture absorption properties have poor moisture resistance.5Conversely, materials that have excellent moisture absorption properties have poor moisture absorption properties, so conventional wall covering materials can suppress condensation inside walls and The result was that it was difficult to function simultaneously with humidity control. However, the sheet-like material (wall covering material) obtained by the manufacturing method of the present invention satisfies the above conditions and has both excellent moisture resistance and moisture control properties.

Further, according to the method, both the open portion formed by foaming the first foamable synthetic resin layer and the curved portion formed by foaming the second foamable synthetic resin layer have countless communicating fine cells. It is a foamable synthetic resin layer, and in the foamable synthetic resin layer, water-absorbing polymer in the form of fine powder is almost uniformly mixed and scattered.

Therefore, even if condensation occurs on the surfaces of both the concave and convex portions, it will be actively absorbed by the open cells and water-absorbing polymer of the foamed synthetic resin layer on the four convex and concave portions. No condensation occurs on the surface.

As mentioned above, the sheet-like product produced by the manufacturing method of the present invention has
In addition to not having any mechanical embossing, the openings are also foamed and have a dew condensation prevention effect, which is far superior to conventional technology.
Furthermore, it is also excellent in that a desired unevenness level difference can be created by arbitrarily adjusting the lamination or coating thickness of each of the first and second foamable synthetic resins.

In particular, this product is different from conventional products in that the appearance of the uneven pattern does not interfere with the condensation prevention II' function.

<Example> A polyethylene film 2 with a thickness of 0.02 nm was laminated on a flame-retardant paper 1 for wallpaper by a lamination method, and then a polyethylene film 2 with a thickness of 0.02 nm was laminated on a flame-retardant paper 1 for wallpaper.
The nonwoven fabric 3, which is a mixture of 09i+a valves and polyvinyl chloride fibers and has a valve ratio of 50%, is laminated by the same laminating method to form a base material with a moisture-proof layer (Figure 1).
,.

A first foamable synthetic resin layer 4 having the following formulation was laminated over the entire surface of this base material F (FIG. 2).

Resin... Vinyl chloride resin 100 Plasticizer -D OP 50 Stable cutting = B a -2', n-based 3 Instant foaming agent =
-A D CA system 5 parts water-absorbing polymer・
... Sumikagel S P -520 10 parts Filler - Calcium carbonate 70 categories Material -
・・Titanium itself + 5 parts Anti-mildew removal - ・Biocide 1.5 parts Next, a rotary screen multicolor printing machine with 5 floral pattern screen cylinders set on the first foamable synthetic resin layer 4 was used. Using foamable vinyl chloride resin paste paint with the following formulation, 0. The second foamable synthetic resin layer 5 was formed in a floral pattern by applying the resin to a thickness of Inn11 and semi-gelling it at a temperature lower than the decomposition temperature of the foaming agent (FIG. 3).

Resin: Vinyl chloride resin +00 Yayuki plasticizer-DOP 5G Yayuki cutting-・B
a-Zn system 3 Instant foaming agent - A D CA system Part: Water-absorbing polymer... Sunwet IM-300 11 parts: Filler: - Calcium carbonate: 30 parts: Pigment: - Titanium itself: IO: Color removal... Red B material
5 Yabo 511 cut--biocide
1.5 parts Continuously, using a gravure printing machine, a transparent 4-resin film rf! made of an amino acid/methacrylic acid/urethane copolymer was applied to the surfaces of the first and second foamable synthetic resin layers. ! A moisture-permeable resin film layer 6 was formed by applying and drying the resin (FIG. 4).

Subsequently, this was introduced into a foaming heating furnace set at about 230°C and heated for 1 minute to foam the first and second foamable vinyl chloride resin layers, resulting in the first foamable synthetic resin layer 4.
is a foamed synthetic resin layer with a thickness of about 1.21 cm.
7, and the second foamable synthetic resin layer 5 is to be foamed in a floral pattern to form a foamed synthetic resin layer 8 with convex portions having a thickness of about 1.3 mm (Fig. 5).

As can be seen from FIG. 5, in F of the synthetic resin layer 8 where the second foamable synthetic resin layer 5 forming the convex portion is foamed, there is a synthetic resin M7 where the first foamable synthetic resin 4 is foamed. Therefore, the total thickness of the convex parts viewed from the surface of the base material is approximately 2.5 m.
m thickness, and a moisture-permeable resin film 6 was formed on the surfaces of both the concave and convex portions.

When the moisture absorption and moisture permeability of this sheet-like material were measured, the values were as shown below.

Moisture absorption ff1--...-N6g/m"l[1OhrMoisture permeability...17g/m"-24hrFrom these results, the sheet-like material obtained in this example has both moisture-proofing properties and moisture-absorbing/releasing properties. It has characteristics not found in conventional wall covering materials.

In addition, this sheet-like material having an uneven pattern is foamed in both the four parts and the convex parts, and furthermore, from the cross section, the first and second parts are foamed.
In both synthetic resins 7 and 8, which are foamed from the foamable synthetic resin layer, countless communicating fine bubbles are created, and water-absorbing polymer in the form of fine powder is almost uniformly mixed therein. The surface is covered with a moisture-permeable resin film 6, and the uneven steps are large, and the concave portions are also foamed, making it a sheet with excellent moisture-proofing and moisture-absorbing and releasing properties, as well as excellent heat and sound insulation properties. It was like that.

[Brief explanation of drawings]

1 to 5 are cross-sectional views for explaining aspects of different stages of an embodiment of the manufacturing method of the present invention. l-flame retardant paper, 2-moisture-proof thermoplastic resin layer, 3-
Non-woven fabric layer, 4--First expandable vinyl chloride resin layer containing a water-absorbing polymer and a foaming agent that creates countless interconnected fine cells after heat-foaming 5--Water-absorbing polymer and after heat foaming a second foamable vinyl chloride resin layer containing a foaming agent that creates countless interconnected microscopic cells; 6.-a moisture-permeable resin film;
7... Foamed synthetic resin layer where the first foamable vinyl chloride resin layer 4 is foamed, 8... Foamed synthetic resin layer where the second foamable vinyl chloride resin layer 5 is foamed Patent applicant Kanto Leather Co., Ltd. Company Representative Director Akinori Seki

Claims (1)

[Scope of Claims] 1. A nonwoven fabric made of wood fibers, vegetable fibers, and synthetic fibers alone or in a mixture is laminated on a sheet-like material in which a resin layer mainly composed of thermoplastic synthetic resin is laminated on flame-retardant paper. A first foamable synthetic resin containing a finely powdered water-absorbing polymer and a foaming agent that creates countless interconnected microbubbles after heating and foaming is laminated on the base material, and then the first foamable synthetic resin is laminated on the base material. The synthetic resin layer contains a finely powdered water-absorbing polymer and a blowing agent that creates countless interconnected microbubbles after heating and foaming, and is colored in the same color or a different color from the first foamable synthetic resin. After forming at least one second foamable synthetic resin into an arbitrary pattern, the first and second foamable synthetic resins described above are foamed and heated. A method for manufacturing a sheet-like product. 2. The method for producing a sheet-like article according to claim 1, characterized in that a moisture-permeable resin film is formed on the first and second foamable synthetic resin layers in the sheet-like article.