JP3600726B2 - Floor materials and apartment houses using the same - Google Patents

Description

【００５７】
【発明の効果】
本発明１の床材は、掃除がし易く衛生的であると共に人が転倒した場合にも安全性が高く、歩行感及び防音性が良好である。
また、本発明２の集合住宅は、上記本発明１の床材を用いているので、少なくとも安全性が高く、場合により防音性、歩行性も良好な住環境が提供される。
【図面の簡単な説明】
【図１】請求項１記載の床材に用いられる硬質発泡体を得るための発泡性熱可塑性樹脂シート状体を製造する工程を説明するための部分的模式的断面図である。
【図２】硬質発泡体を製造する際の冷却工程を示す模式的断面図である。
【図３】本発明の床材の一例を示す模式的部分断面図である。
【図４】床材の硬さ測定装置の例を示す図である。
【符号の説明】
７ 発泡性熱可塑性樹脂シート状体
１０ 硬質発泡体
１４ 硬質板状体
１５ 軟質発泡体
１６ 床材[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a floor material and an apartment house using the same, and more particularly, to a floor material having high safety even if a person falls down and having good soundproofing and walking feeling, and an apartment house using the floor material.
[0002]
[Prior art]
2. Description of the Related Art In recent years, there has been an increasing demand for a floor material using a hard and easy-to-clean sanitary hard plate material for an apartment house. However, a floor material composed of only a hard plate-like body such as plywood has a problem in that the soundproofing property and the safety when falling down are low.
Among them, a number of floor materials having a synthetic resin foam layer provided on the back surface of a hard plate-like body have been proposed (for example, Japanese Utility Model Laid-Open Publication No. 56-3945) to improve soundproofing. If the thickness is too thick, the soundproofing will be improved, but the sinking during walking will increase and the walking feeling will be impaired, making it impractical.Therefore, flooring that combines soundproofing and walking properties is demanded. Was.
[0003]
On the other hand, when a person falls on a hard floor, hitting his or her head may cause concussion and even death, and it is considered that the safety standard is preferably 100 G or less as measured by JIS A6519.
[0004]
[Problems to be solved by the invention]
However, according to the study by the present inventors, the hardness of general plywood flooring material shows a large value of 140 to 160 G, and the value of 125 to 140 G even when a soft urethane foam of 5 to 6 mm is stuck on the back surface. Met. In a building, the body falls sharply, and various parts of the body, particularly the head, elbows, knees, and waist, may collide with the floor. If the floor is not soft enough, a serious injury may occur.
[0005]
However, with respect to floor materials using a hard plate-shaped body, particularly for apartment houses, no proposal has been made to set the hardness at the time of falling within a certain range from the viewpoint of ensuring safety.
[0006]
An object of the present invention is to solve the above-mentioned problems and to provide a floor that is safe even when a person falls down, a floor that has good soundproofing and walking feeling with such safety, and an apartment house using the same. And
[0007]
[Means for Solving the Problems]
The floor material of the present invention 1 (the invention according to claim 1), a surface layer made of a hard plate-like body having a thickness of 1 to 5 mm, a hard foam having a thickness of 3 to 20 mm, and a soft foam having a thickness of 1 to 5 mm The foam is laminated in this order, the rigid foam is a continuous foam layer made of a thermoplastic resin, a high foam portion made of a thermoplastic resin arranged on at least one side of the continuous foam layer, and the continuous foam layer. and a low foaming thin film made of a thermoplastic resin covering the outer surface of the high foaming portion foamed layer co, plate wherein the plurality of high expansion portion is thermally fused through the low foaming films to each other In the thermoplastic resin foam, the surface of the plurality of high-foaming portions that is not covered with the continuous foam layer is a high-foaming portion covered with a low-foaming thin film, and the space between the high-foaming portions is concave. The uneven surface is formed so as to be as follows.
[0008]
An apartment house according to a second aspect of the invention (an invention according to the second aspect) is an apartment house using the flooring material according to the first aspect.
[ 0009 ]
(Hard plate)
The hard plate used in the present invention 1 is not particularly limited as long as it does not easily break or be damaged when subjected to a load. For example, (1) veneer, (2) plywood, (3) A resin plate, and (4) a fiber-reinforced synthetic resin plate. If many grooves are provided on the back side, for example, in parallel with the longitudinal direction, the soundproofing performance can be improved. These may be used alone, but are generally used by decorating the surface.
[ 0010 ]
(1) Single veneer A single veneer, usually called a solid veneer, which can be applied to varnish or oil to provide a veneer with excellent woody feel.
[ 0011 ]
(2) Plywood Plywood conventionally used for floor materials can be used. Moreover, what is called a medium density fiberboard "MDF" and what is called a high density fiberboard "HDF" can be used.
[ 0012 ]
(3) Resin plate A plate made of a so-called hard resin such as a polyethylene plate (an ultra-high molecular weight polyethylene plate is particularly preferable), a polypropylene plate, or a polyvinyl chloride plate is preferably used.
[ 0013 ]
(4) Fiber-reinforced synthetic resin plate Thermosetting polyester resin plate, epoxy resin plate, hard polyurethane plate (foamed 2-3 times if necessary), polyvinyl chloride plate, etc. reinforced with glass fiber Can be used.
[ 0014 ]
The thickness of the hard plate is preferably 1 to 5 mm, more preferably 2 to 4 mm, because if it is too thin, strength and rigidity are insufficient, and if it is too thick, floor impact sound insulation performance is reduced.
[ 0015 ]
Surface Decoration The surface of the hard plate-shaped body may be decorated by printing a wood grain pattern, a marble pattern, a granite pattern or the like in order to enhance the design.
[ 0016 ]
Further, in order to decorate the surface, a decorative sheet-like material for improving the design may be further laminated on the surface of the hard plate-like body. As the decorative sheet, a synthetic resin sheet on which a wood pattern, a marble pattern, a granite pattern, or the like is printed, for example, a vinyl chloride sheet can be used. Alternatively, a “push plate” formed by slicing generally commercially available wood may be adhered to the surface of the hard plate as a decorative sheet. It is preferable to provide veneers on both the front and back surfaces since warpage is reduced.
[ 0017 ]
As an adhesive or a pressure-sensitive adhesive for bonding the decorative sheet to the hard plate, a commonly used acrylic adhesive or a natural or synthetic rubber adhesive can be used.
[ 0018 ]
Surface Coating In the present invention 1, if necessary, in order to increase the abrasion resistance of the surface or to develop a color or luster, the surface (when the surface of a hard plate or a decorative sheet is further laminated) May be coated on the surface of the decorative sheet. As such a coating method, a method generally called a ceramic coating can be adopted, and thereby, the abrasion resistance of the surface can be enhanced. The ceramic coating can be performed by applying a paint such as an acrylic silicon-based, an acrylic urethane-based, or an alkyl silicate-based containing an alkyl group having 10 or less carbon atoms containing inorganic fine particles such as colloidal silica, followed by drying.
[ 0019 ]
If the compression elastic modulus of the hard plate is too small, it will float or sink due to the weight of a person or the load of furniture, so that it is usually 4 kg / cm 2 or more, preferably 5 kg / cm 2 or more.
The flexural modulus of the hard plate is preferably 500 to 2200 kg / cm 2, because too high a modulus may degrade floor impact sound insulation performance .
[ 0020 ]
The flooring material of the present invention has a hardness (maximum value of generated acceleration) of 90 G or less measured according to JIS A6519.
If the value of the floor hardness test specified in JIS A6519.8.7 is larger than 90G, it is said that there is a risk of hitting the head and dying when falling over in an apartment house.
[ 0021 ]
JIS A6519.8.7 models a human head and approximates the use of each part to an actual head. Specifically, a frame (outer diameter 216.3 mm, thickness 8.2 mm) is used. A head model device having a total weight of 3.85 Kg including a head, a weight (1.34 Kg), a width of 40 mm, a weight of 1.71 Kg, a flexural rigidity of 2.12 × 10 3 Kg / cm, and the like is mounted on the floor from a predetermined height. The maximum acceleration generated by the accelerometer when freely dropped on the rubber plate is used to evaluate the floor hardness from the viewpoint of the safety of a falling collision.
[ 0022 ]
(Rigid foam)
Examples of the rigid foam include a rigid polyurethane foam having a magnification of 5 to 25 times, a rigid polystyrene foam having a magnification of 10 to 30 times, and particularly, a continuous foam layer made of a thermoplastic resin as described below. A high-foaming portion made of a thermoplastic resin disposed on at least one surface of the continuous foaming layer, and a low-foaming thin film made of a thermoplastic resin covering the outer surface of the high-foaming portion together with the continuous foaming layer. A plurality of high-foaming portions , each of which is a plate-shaped thermoplastic resin foam that is thermally fused to each other via the low-foaming thin film, and is not covered with the continuous foam layer of the plurality of high-foaming portions. Rigid thermoplastic resin foam is preferred, in which the side surface is formed with an uneven surface such that the high foamed portion covered with the low foamed thin film is convex and the space between the high foamed portions is concave.
[ 0023 ]
The volume of the rigid foam on which the uneven surface is formed is usually 50 to 90% (this ratio is hereinafter referred to as “filling rate”) with respect to the volume of the smallest rectangular parallelepiped that can circumscribe the foam. .
[ 0024 ]
When the expansion ratio of the hard foam is too low, the lightness is impaired, and when it is too high, the compressive strength is reduced. It is 30 times, preferably 3 to 20 times, more preferably 7 to 12 times.
The thickness of the rigid foam is preferably from 3 to 20 mm, more preferably from 2 to 15 mm.
[ 0025 ]
The method for producing the rigid foam is not particularly limited. For example, foamable thermoplastic resin granules containing a foaming agent are arranged substantially uniformly in a plane, and the foamable thermoplastic is Heating and foaming the foamable thermoplastic resin sheet, in which the resin granules are integrally connected via a foamable thermoplastic resin thin film, at or above the decomposition temperature of the foaming agent; And a step of cooling with a cooling device having a gap larger than the sheet material is completely filled.
[ 0026 ]
The thermoplastic resin used for the foamable thermoplastic resin sheet, that is, the thermoplastic resin constituting the hard foam is not particularly limited, but is easily formed with an uneven shape, polyethylene, a polyolefin resin such as polypropylene or the like. Is preferable, and a high-density polyethylene, a homopolypropylene capable of exhibiting high compressive strength, or a mixture containing at least one of them is particularly preferable.
[ 0027 ]
As the thermoplastic resin used for the foamable thermoplastic resin sheet, it is preferable to use a crosslinked thermoplastic resin in order to improve the expansion ratio and reduce the weight of the obtained irregular thermoplastic resin foam. Examples of the cross-linking method include a method in which a silane graft polymer is melt-kneaded in a thermoplastic resin, and then subjected to a water treatment to perform cross-linking.
[ 0028 ]
The thermoplastic resin used for the foamable thermoplastic resin sheet preferably comprises a mixture of a highly crosslinked thermoplastic resin composition and a low crosslinked thermoplastic resin composition having almost no compatibility. In this case, since the low-crosslinking or non-crosslinking thermoplastic resin composition easily flows at the time of foaming, the unevenness of the obtained thermoplastic resin foam is easily formed, which is preferable.
[ 0029 ]
High cross-linking and low cross-linking in the high cross-linking thermoplastic resin composition and low cross-linking or non-cross-linking thermoplastic resin composition are relative expressions determined by the magnitude of both cross-linking degrees, and of the two cross-linked thermoplastic resin compositions, A relatively highly crosslinked resin composition is referred to as a highly crosslinked resin composition (A), and the other is referred to as a low crosslinked or non-crosslinked resin composition (B).
[ 0030 ]
The highly crosslinked resin composition (A) is a resin composition containing a resin component (A ′) as a main component, and the low crosslinked or non-crosslinked resin composition (B) is a resin composition containing a resin component (B ′) as a main component. is there. Therefore, when a mixture of a highly crosslinked resin composition (A) and a low crosslinked or non-crosslinked resin composition (B) having almost no compatibility is used as a thermoplastic resin constituting a foamable thermoplastic resin sheet. Has almost no compatibility between the resin component (A ′) and the resin component (B ′), which are the main components.
[ 0031 ]
As the thermoplastic resin used for the two types of resin components (A ′) and (B ′) having almost no compatibility, the above-mentioned polyolefin resin can be suitably used. In order to form (A ′) and the resin component (B ′), the difference between the solubility parameters of the two thermoplastic resins is preferably 0.1 to 2.0, and 0.2 to 1.5. Is more preferable.
[ 0032 ]
The difference between the two thermoplastic resins in terms of melt index (hereinafter referred to as “MI”, a value measured according to JIS K7210) is preferably 5 to 13 g / 10 minutes, and 7 to 11 g / 10 minutes. More preferably, there is.
[ 0033 ]
In order to obtain a thermoplastic resin foam having a high expansion ratio, in which the resin component (A ′) and the resin component (B ′) are uniformly dispersed and have excellent surface smoothness, a highly crosslinked resin composition (A) and a low crosslinked resin composition are required. or mixing ratio of the non-crosslinked resin composition (B) in a weight ratio of 2: 8 to 8: a is desirably 2, 4: 6 to 6: 4 is preferred, 5: 5, more preferred arbitrariness.
[ 0034 ]
The degree of crosslinking of the highly crosslinked resin composition (A) is preferably from 5 to 60% by weight, more preferably from 10 to 30% by weight, as a gel fraction which is an index of the degree of crosslinking. The degree of crosslinking of the low-crosslinking or non-crosslinking resin composition (B) is preferably 5% by weight or less, more preferably 3% by weight or less, as a gel fraction serving as an index of the degree of crosslinking.
[ 0035 ]
As a method of preparing a mixture of the highly crosslinked resin composition (A) and the low crosslinked or non-crosslinked resin composition (B) having almost no compatibility, the mixture has almost the same MI as the resin component (A ′), and A method is preferred in which a crosslinkable resin (C) of the same type as the resin component (A ′) having a crosslinkable functional group is mixed with the resin component (A ′) and the resin component (B ′) and then crosslinked.
[ 0036 ]
Specific examples of the crosslinkable resin (C) are preferably silane-modified polyethylene and silane-modified polypropylene. As a method of cross-linking the cross-linkable resin (C), a method of hydrolyzing a reactive functional group and then cross-linking with water is preferable.
[ 0037 ]
(Soft foam)
The soft foam used in the present invention is not particularly limited as long as it has a relatively small compression elastic modulus relative to the above-mentioned hard foam. For example, a polyethylene foam having an expansion ratio of 20 to 40 times, a flexible polyurethane foam, and the like. And an independent foam is preferably used. When a continuous foam is used, the adhesive may be impregnated in the air bubbles at the time of application, and therefore, it is preferable to laminate a film, a fine nonwoven fabric, or the like.
[ 0038 ]
Since the flooring material of the present invention is often constructed so that the soft foam contacts the concrete floor slab, the thickness of the soft foam is usually 1 to 5 mm, preferably 1 to 5 mm, so as to be able to absorb the irregularities of the concrete. 2 to 3 mm.
[ 0039 ]
(Production of flooring)
At each interface of the hard plate, the hard foam and the soft foam, an adhesive generally used for bonding floor materials, such as an aqueous polyvinyl acetate emulsion, an acrylic adhesive, and a chloroprene adhesive, is appropriately used. Then, the two or three layers are bonded, laminated and integrated to obtain the flooring material of the present invention. In order to enhance the adhesiveness, for example, a corona discharge treatment may be performed on a rigid foam.
[ 0040 ]
(Action)
The floor material of the present invention 1 has a surface layer made of a hard plate having a thickness of 1 to 5 mm, a hard foam having a thickness of 3 to 20 mm, and a soft foam having a thickness of 1 to 5 mm, which are laminated in this order. Wherein the rigid foam is a continuous foam layer made of a thermoplastic resin, a high foam portion made of a thermoplastic resin arranged on at least one surface of the continuous foam layer, and the high foam portion together with the continuous foam layer. A low-foaming thin film made of a thermoplastic resin covering the outer surface of the plate-like thermoplastic resin foam, wherein the plurality of high-foaming portions are thermally fused to each other via the low-foaming thin film, An uneven surface is formed such that the surfaces of the plurality of high-foaming portions that are not covered with the continuous foaming layer are convex in the high-foaming portion covered with the low-foaming thin film, and concave between the high-foaming portions. because in that, along with the cleaning is an easy hygienic, people are tipping the head, etc. Even Tsu safety is ensured. In addition, since the hard plate, the hard foam, and the soft foam are laminated in this order, it is possible to absorb and adjust the unevenness to the floor base material such as concrete, so that the walking feeling is good and the soundproofing is secured. Is done.
[ 0041 ]
In addition, by retaining the rigidity of the strength as a floor material by the rigid foam having the uneven surface formed thereon, it is possible to make the rigid plate-like body thinner, further enhance safety, and maintain soundproofing. .
[ 0042 ]
Further, since the apartment house of the present invention 2 uses the flooring material of the present invention 1 , at least the injury is light even if a person falls down in the house, and in some cases, the soundproofing property and the walking property are also good. It is.
[ 0043 ]
【Example】
(Example 1)
Production of foamable thermoplastic resin sheet 50 parts by weight of polypropylene (MI = 11 g / 10 min), crosslinkable silane-modified polypropylene (manufactured by Mitsubishi Yuka Co., product number “XPM800H”, MI = 11 g / 10 min, after crosslinking) 50 parts by weight of a gel fraction (80% by weight), 20 parts by weight of high-density polyethylene (MI = 1.5 g / 10 minutes), 0.1 part by weight of dibutyltin dilaurate as a silane crosslinking catalyst, and azo as a pyrolytic foaming agent 4 parts by weight of dicarbonamide (manufactured by Otsuka Chemical Co., Ltd., product number “SO-20”, decomposition temperature 210 ° C.) was supplied to the extruder 1 shown in FIG. In the extruder 1, the composition was melt-kneaded at 180 ° C. and extruded into a softened sheet-like foamable thermoplastic resin with a 500 mm T-die 2.
[ 0044 ]
Further, a softened sheet is placed between a shaping roll 3 having a diameter of 250 mm and a surface length of 500 mm and having cylindrical recesses 3a arranged in a staggered manner on the outer peripheral surface and a shaping roll 4 having a smooth outer peripheral surface. The foaming thermoplastic resin is cooled while being shaped, and in the portion corresponding to the concave portion 3a of the shaping roll 3, the foaming thermoplastic resin granules 5 containing the foaming agent are substantially uniformly planarized. A foamable thermoplastic resin sheet 7 is provided, which is arranged in a staggered manner and in which the foamable thermoplastic resin granules 5 are integrally connected via a foamable thermoplastic resin thin film 6. The obtained foamable thermoplastic resin sheet 7 was immersed in water at 98 ° C. for 2 hours and then dried to obtain a finally formed foamable thermoplastic resin sheet.
[ 0045 ]
The height of the expandable thermoplastic resin particles 5 in the expandable thermoplastic resin sheet 7 is 5 mm, the diameter is 4 mm, the center interval between the particles is 10 mm, and the thickness of the expandable thermoplastic resin thin film 6 is 0.3 mm.
[ 0046 ]
Production of Thermoplastic Resin Foam and Shape of Foam The foamable thermoplastic resin sheet 7 is placed on a fluoroethylene resin sheet 8, and the fluoroethylene resin sheet 8 is further superimposed thereon. After heating and foaming for 10 minutes using a hand press, as shown in FIG. 2, it is transferred to a cooling press mold 9 at 30 ° C. with a spacing of 7 mm, cooled for 10 minutes, and foamed with a thickness of 7 mm. 10 was obtained. The expansion ratio of this thermoplastic resin foam 10 measured by the underwater substitution method was 10 times.
[ 0047 ]
The thermoplastic resin foam 10 includes a continuous foam layer 11 made of a thermoplastic resin, a high foam portion 12 made of a thermoplastic resin and a plurality of thermoplastic resins arranged on one surface of the continuous foam layer 11, A low-foaming thin film 13 made of a thermoplastic resin covering the outer surface, wherein the plurality of high-foaming portions 12 are heat-sealed to each other via the low-foaming thin film 13 with a plate-like thermoplastic resin foam. The surfaces of the plurality of high-foaming portions 12 which are not covered with the continuous foaming layer 11 are convex at the high-foaming portions 12 covered with the low-foaming thin film 13 and concave between the high-foaming portions 12. Since the uneven surface is formed as described above, high compressive strength, that is, hardness is exhibited.
2 and FIG. 3, which will be described later, are only schematic views. In particular, the interface between the low-foaming thin film 13 and the high-foaming portion 12 may not be formed uniformly and clearly as illustrated. The height of the convex portion of the thermoplastic resin foam 10 was 7 mm, and the above-mentioned filling rate of the volume was 75%.
[ 0048 ]
Fabrication of flooring As a hard plate, a veneer having a thickness of 0.3 mm is attached to both sides of a 2.4 mm thick medium density fiberboard (MDF). A flexible polyurethane foam having a thickness of 3 mm and an expansion ratio of 40 was prepared from a 7 mm thermoplastic resin foam and a soft foam.
As shown in FIG. 3, these rigid plate-like body 14, the surface of the rigid foam 10 and the soft foam 15 bonded laminated using an aqueous polyvinyl acetate emulsion (200 g / m @ 2), to give the floor member 16.
[ 0049 ]
Performance evaluation (floor hardness)
It was measured using a hardness measuring device shown in FIG. 4 in accordance with JIS A6519.8.7. In FIG. 4 , A is a load transducer, B and D are accelerometers, C is a strain gauge, E is a 1.34 kg weight, F is a frame, and G is a steel head. Is constructed.
In the test, a head model weighing 3.85 kg was dropped freely from a position having a height of L20 cm to a measurement point of a rubber plate having a Shore A hardness of 37 placed on the flooring material 16, and the acceleration when colliding with the floor was measured. Then, the hardness at the time of falling collision was determined.
[ 0050 ]
(Soundproof)
The lightweight floor impact level LL was measured according to JIS A1418.
[ 0051 ]
(Walking feeling)
Judgment was made based on the sinking amount when a steel ball having a diameter of 50 mm was pressed against the hard plate-like body with a force of 80 kgf. Usually, about 2 mm, specifically, 1.4 to 2.6 mm is considered to be good. If it is 4 mm or more, discomfort will be felt when walking, and if it is 0 mm, the soles of the feet will hurt as if walking on concrete.
[ 0052 ]
Table 1 shows the measurement results together with the results of the other examples.
[ 0053 ]
(Example 2)
A floor material was prepared and the characteristics were evaluated in the same manner as in Example 1, except that the MDF having a thickness of 4.4 mm was used and the thickness of the hard plate was set to 5 mm.
[ 0054 ]
(Comparative Examples 1-4)
As shown in Table 1, a hard plate having a thickness different from that of Example 1 was obtained from the same veneer plate as in Example 1 and an MDF having a different thickness. A flooring material was prepared in the same manner as in Example 1 by appropriately combining the same soft foam or a soft foam differing only in thickness, and the properties were evaluated.
[ 0055 ]
(Comparative Examples 5 to 7)
The characteristics of a commercially available sound-insulating flooring material (Comparative Examples 5 and 6) having a layer configuration shown in Table 1 and a commercially available non-soundproofing flooring material consisting only of a hard plate (Comparative Example 7) using no hard foam were used. evaluated.
[ 0056 ]
[Table 1]

[ 0057 ]
【The invention's effect】
Flooring of the present invention 1, cleaning is the rather high safety even when a person falls down with a easy hygienic, has good walking feeling and acoustic insulation.
In addition, since the apartment house of the second aspect of the present invention uses the floor material of the first aspect of the present invention, a living environment with at least high safety and, in some cases, good soundproofing and walking properties is provided.
[Brief description of the drawings]
FIG. 1 is a partial schematic cross-sectional view for explaining a step of producing a foamable thermoplastic resin sheet for obtaining a rigid foam used for a flooring according to claim 1 .
FIG. 2 is a schematic cross-sectional view showing a cooling step when manufacturing a rigid foam.
FIG. 3 is a schematic partial sectional view showing an example of the flooring material of the present invention.
FIG. 4 is a diagram showing an example of a floor material hardness measuring device.
[Explanation of symbols]
7 Foamable thermoplastic resin sheet 10 Hard foam 14 Hard plate 15 Soft foam 16 Floor material

Claims (2)

A surface layer made of a hard plate-like body having a thickness of 1 to 5 mm, a hard foam having a thickness of 3 to 20 mm, and a soft foam having a thickness of 1 to 5 mm are laminated in this order, and the hard foam is A continuous foam layer made of a thermoplastic resin, a high foam portion made of a thermoplastic resin arranged on at least one surface of at least one surface of the continuous foam layer, and a thermoplastic resin that covers the outer surface of the high foam portion together with the continuous foam layer. A low-foaming thin film made of a resin, wherein the plurality of high-foaming portions are plate-shaped thermoplastic resin foams which are thermally fused to each other via the low-foaming thin film, and A floor characterized in that a surface not covered with the continuous foam layer has an uneven surface such that a high foam portion covered with a low foam thin film is convex and a space between the high foam portions is concave. Wood. An apartment house using the floor material according to claim 1 .

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