JPH11131760A - Tatami mat floor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the mechanical strength of a light and thin tatami mat by laminating a particleboard in which a reticulated body is interposed and a plastic foamed body, and integrally sewing up them with sewing threads. SOLUTION: A particleboard 2 that a reticulated body 3 made of a thermoplastic resin is interposed in the lower part of the thickness direction is used as a core member 4. A plastic foamed body 5 is laminated on the surface of the core member 4 and they are integrally sewed up by sewing threads 7. A rear sheet 6 is fixed to the rear face of the core member 4 with an adhesive 8 such as hot melt to form a tatami mat floor 1a. A tatami front face 10 is fixed to the surface of the tatami mat floor 1a with an adhesive or an adhesive tape and the end is turned back and fixed to the rear face to form a thin tatami mat 9a having 12-15 mm total thickness. In this case, the rear sheet 6 is cut in advance to prevent a level difference owing to the superposition with the front face 10. Accordingly, the particleboard 2 and the plastic foamed body 5 are firmly sewed up by the sewing threads 7 and a light and thin tatami mat excellent in the mechanical strength can be constituted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tatami floor for building materials, particularly a thin tatami floor, to be installed on a wooden floor or a parquet floor of a house.

[0002]

2. Description of the Related Art Tatami has been used for a long time, and if the thickness is not uniform, it is inconvenient in designing a house or producing floors. I was However, in recent houses, thin tatami mats that are close to rugs have been used, and those that are light in weight and easy to carry are preferred. In order to make the tatami thin, the thickness of the tatami mat is almost constant, so the tatami floor is made thin. As a core material for such a tatami floor, a composite board in which a cushioning material or a non-slip material is bonded to a veneer plywood, a plastic cardboard, a foamed plastic board, an insulation board (fiber board), or the like has been used. As the building material tatami floor, a laminate obtained by laminating only a polystyrene foam plate and an insulation board, or a laminate obtained by combining a rice straw or a polystyrene foam plate with the core material is used.

[0003] However, in the core material of the conventional tatami floor as described above, the veneer plywood has a high mechanical strength but is easily warped, and the strength is so strong that the tatami surface is easily damaged on four sides and is easily damaged during movement. There's a problem. The plastic cardboard or foamed plastic board shrinks due to temperature or is inferior in shape retention, so that it is pressed and deformed when a large load is applied, and loses the tension of the tatami mat and warps or warps as a whole.
When the insulation board is thin, it is difficult to manufacture and easily breaks. In addition, the insulation board tends to change its dimensions due to the influence of the moisture content and the humidity of the atmosphere during the manufacture. Accordingly, there has been a demand for a tatami floor using a core material which has sufficient strength even when it is thin, has elasticity, and does not deform.

[0004] Further, in the tatami floor, it is necessary to integrate a plurality of laminated constituent materials with appropriate towability and elastic restoring property. The performance as a tatami floor is inferior and unsuitable. Therefore, a method of integrating by sewing with a sewing thread is generally adopted.However, in order to stably maintain the tightening at the time of sewing, a back material such as a paper cloth or a cross lamination product is provided on the back surface. Needed.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks of the prior art, which is lightweight and thin, has excellent mechanical strength, and hardly causes warpage or shrinkage. It is an object of the present invention to provide a tatami floor which is a floor and does not require a back surface material for improving sewing tightness in sewing a core material and other components forming the tatami floor.

[0006]

Means for Solving the Problems As a result of intensive studies to achieve the above-mentioned object, the present inventor has found that a tatami floor with a mesh made of a thermoplastic resin inserted as a reinforcing material inside a particle board. By using the core material, a tatami floor with excellent mechanical strength can be easily obtained even if it is thin, and the core material can be obtained without using the back material for sewing by hooking and sewing on the mesh. It has been found that other constituent materials are easily integrated.

[0007] That is, the first aspect of the present invention relates to a tatami floor characterized by using, as a core, a particle board having a net formed of a thermoplastic resin therein.

[0008] A second aspect of the present invention is that at least one core material made of a particle board in which a net made of the above-mentioned thermoplastic resin is embedded and another component member forming a tatami floor are formed into a net by a sewing thread. The present invention relates to a tatami floor characterized by being hooked and sewn.

The particle board used for the core material of the tatami floor of the present invention is a wood board widely used for furniture and building materials. Generally, after particle flakes and / or fine powder obtained by grinding wood chips are dried, an adhesive compounding liquid is uniformly applied to the particle flakes and / or fine powder and mixed. It is manufactured by a method of forming into a predetermined thickness and density such as 0.78 and heat molding. This particle board is superior in strength to a conventional insulation board, and a thin board can be easily manufactured. Such a particle board,
Compared to veneer plywood, plastic corrugated cardboard, foamed plastic board, insulation board, etc., which has been used as a core material, warpage and shrinkage are less likely to occur and the shape retention is excellent, but it was used alone as a core material for tatami floors In such a case, the mechanical strength such as bending strength, impact strength, and flexibility is insufficient, and the tatami floor does not have sufficient quality as a core material. Therefore, in the present invention, by providing a net-like body as a reinforcing material inside the particle board, the mechanical strength is further improved, and the core material of the tatami floor is excellent.

[0010] The method of causing the net to be present inside the particle board is not particularly limited.
For example, a method of inserting a net into a particle board using one or two or more rotating rolls and molding the same by using a hot roll pressing type particle board manufacturing system disclosed in JP-A-3-61005 is disclosed. Used. In this method, it is possible to insert a mesh at an arbitrary position by changing the position of the rotating roll, and it is also possible to insert two or more meshes by increasing the number of rotating rolls.

As the core material of the present invention, one net is usually inserted into a particle board. The insertion position may be any position in the thickness direction of the particle board, but if it is inserted downward. In the case where a tatami floor is formed by using a particle board in which this net-like body is present as a core material, it is more effective for tightening when sewing.

The network made of a thermoplastic resin inserted into the particle board is not particularly limited as long as it is a network that can be used as a reinforcing support layer. Further, the size of the mesh is not particularly limited as long as the particle flakes and / or fine powder can pass through during the production of the particle board. For example, if the mesh is square, it is about 1 to 8 mm, preferably about 5 mm.

As the mesh, for example, a uniaxially or biaxially oriented perforated film, a punched film, various nets, and the like can be used, and preferably, a split web, a slit web, or a uniaxially oriented multilayer tape is used. A nonwoven fabric or a woven fabric obtained by laminating or weaving at least one kind of uniaxially oriented body so that the orientation axes cross each other, and a composite material thereof are used.

The above-mentioned split web is prepared by extruding a multilayer film, preferably two or more layers, produced by an extrusion molding method such as a multilayer inflation method or a multilayer T-die method in a longitudinal direction (length direction) or a lateral direction (width direction). It is a uniaxially oriented net-like film that has been stretched and intermittently provided with numerous cracks in the stretching direction, and the slit web is formed in the multilayer film by providing a number of slits (cuts) vertically or horizontally and then in the slit direction. It is a stretched uniaxially oriented net-like film. Further, the uniaxially oriented multilayer tape is obtained by uniaxially stretching the multilayer film in a longitudinal or lateral direction before and / or after cutting.

More specifically, the nonwoven fabric and the woven fabric made of the uniaxially oriented body include, for example, a nonwoven fabric obtained by laminating and splitting a split web and thermocompressing, a nonwoven fabric formed by laminating a slit web and thermocompressing, a split web and a slit web Nonwoven fabrics laminated by laminating and thermocompression bonding, nonwoven fabrics laminated by weft lamination so that the orientation axes of a split web or slit web and a uniaxially oriented multilayer tape cross each other, and woven fabrics obtained by weaving a uniaxially oriented multilayer tape, etc. Is mentioned.

As the non-woven fabric made of a uniaxially oriented material, it is preferable that at least one kind of uniaxially oriented material selected from a split web, a slit web, and a uniaxially oriented multilayer tape is laminated in a manner so that the orientation axes cross each other. However, depending on the application, the layers may be laminated with the orientation being random or in the same direction.

Further, these woven fabrics or nonwoven fabrics can be used in the form of a composite laminate.

The uniaxially oriented body may have a single-layer structure, but has a melting point (or softening point) lower than that of the first thermoplastic resin on at least one surface of the crystalline first thermoplastic resin layer. It is desirable that it is a multilayer stretched body formed by providing a second thermoplastic resin layer having the same. The second thermoplastic resin not only serves as an adhesive layer between the uniaxially oriented bodies when weftly laminating or weaving the uniaxially oriented bodies such as (a) to (c), but also has a melting point (or softening point) thereof. In some cases, it also acts as an adhesive between the particle board and the mesh.

As the first thermoplastic resin constituting the network, it is preferable to use a resin having crystallinity and exhibiting molecular orientation by stretching or the like. High-density and medium-density polyethylene, polypropylene, polybutene- 1, poly-
Polyolefins such as α-olefin homopolymers such as 4-methylpentene-1 and polyhexene-1 and α-olefin mutual copolymers such as propylene-ethylene copolymer, nylon, polyamide, polyester, polycarbonate and polyvinyl Homopolymers and copolymers such as alcohol and polyethylene terephthalate, and mixtures of these with each other or other resins containing these as a main component are used.

The second thermoplastic resin having a lower melting point (or softening point) than that of the first thermoplastic resin can be selected variously depending on the combination with the first thermoplastic resin.
High density, medium density and low density polyethylene, linear low density polyethylene, ultra low density polyethylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer and ethylene-methacrylic acid copolymer, ethylene-ethyl acrylate Ethylene-acrylic ester copolymers such as copolymers, ethylene-methacrylic ester copolymers such as ethylene-ethyl methacrylate copolymer, ethylene- (maleic acid or its ester) copolymer, polypropylene, propylene -Propylene polymers such as ethylene copolymers, and polyolefins modified with unsaturated carboxylic acids. Further, a mixture of these resins and other polyolefin-based resins may be used. For example, a high-density polyethylene or a polyethylene such as an ethylene-α-olefin copolymer may be used as a random copolymer of propylene and ethylene or 1-butene. What mixed the base resin is used. For reasons of production and to prevent a decrease in strength increased by stretching or rolling of the uniaxially oriented body, the difference between the melting points (or softening points) of the second thermoplastic resin and the first thermoplastic resin is at least 5 C. or higher, more preferably 10 to 50C.

Examples of common combinations of the first thermoplastic resin and the second thermoplastic resin include high-density polyethylene and low-density polyethylene, high-density polyethylene and ethylene-vinyl acetate copolymer, and isotactic. Examples include polypropylene and an amorphous ethylene-propylene copolymer, and a mixture of isotactic polypropylene and polypropylene mainly composed of low-density polyethylene.

The core material used in the present invention may be used alone as a tatami floor for thin tatami mats, but usually, a tatami floor is formed by laminating various plastic foams, other boards, sheets and the like. For example, a tatami floor is formed by laminating and integrating a plastic foam on the surface of the core material and a back sheet for preventing slip on the back surface. In this case, it is preferable to fix the plastic foam and the core material with sewing threads in terms of performance as a tatami floor, but the back sheet may be fixed with an adhesive.

When a plurality of cores are stacked to form a tatami floor, these cores must be securely sewn and integrated with sewing threads. In such sewing with a sewing thread, a tatami floor using a particle board in which the mesh body of the present invention is inserted as a core material has a member for sewing to the core material itself, that is, a mesh body, so that a conventional tatami floor is used. As described above, there is no need to provide a backing material such as a paper cloth or a cross-laminated product for sewing the core materials together or the core material and other components constituting the tatami floor.

In the tatami floor of the present invention, a thin tatami mat is completed by stacking a tatami mat on the front side. The total thickness of the thin tatami mat manufactured using the tatami floor of the present invention is generally 10 to 20 mm, and preferably about 15 mm. In this case, the thickness of the tatami floor of the present invention is Generally 5-15m
m, preferably about 10 mm.

The tatami mat is usually sewn at the end of the tatami mat floor. However, when the tatami mat is too thin to be sewn or when the tatami mat is made of plastic, an adhesive or an adhesive tape, staple, or the like is used. May be used for fixing.

When the tatami floor of the present invention is used to make a thin tatami mat,
In order to further improve the cushioning property, a cushion material such as a non-woven fabric may be provided between the tatami floor and the tatami mat surface. A stopper made of metal may be fixed.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the drawings.

FIG. 1 is an example of a partial sectional view showing a state where a tatami floor of the present invention is sewn. In the tatami floor 1a of the present invention, a core material 4 of a tatami floor in which a mesh body 3 made of a thermoplastic resin is inserted below the particle board 2 in the thickness direction, and a plastic foam 5 is provided on the front side of the core material 4. To the core material 4
A back sheet 6 for non-slip is laminated on the back side of.
The plastic foam 5 is fixed to the core 4 by sewing with a sewing thread 7. The sewing method is not particularly limited, and a general tatami mating device is used. The needle is dropped from the upper surface of the tatami floor 1 in the longitudinal direction (or the width direction) by a sewing machine from above with the sewing thread 7. Sewn up. Further, the back sheet 6 is fixed to the back side of the core material 4 via an adhesive 8 such as hot melt. In the tatami floor 1a, the plastic foam 5 and the core material 4 are hooked by the reticulated material 3 embedded in the core material 4 by the sewing thread 7 and are securely sewn and fixed. The hole does not expand.

FIG. 2A is a sectional view showing an example of a thin tatami mat using the tatami floor 1a of the present invention. As in the case of FIG. 1, a core material 4 of a tatami floor in which a mesh 3 made of a thermoplastic resin is inserted below the thickness direction of the particle board 2, and a plastic foam 5 on the front side of the core material 4, On the back side, a back sheet 6 for non-slip was laminated. As in the case of FIG. 1, the core 4 and the plastic foam 5 are hooked onto the mesh 3 with sewing threads 7 and sewn together, and the backing sheet 6 is tightly integrated with the backing 6 with an adhesive 8 such as hot melt. The tatami floor 1a was fixed to the back side of the material 4. The thin tatami mat 9a is completed by stacking the tatami mat 10 on the tatami floor 1a. The tatami mat 10 is fixed to the core 4 with an adhesive or an adhesive tape. The end of the tatami table 10 is folded back and fixed, but this folded portion hits the lower surface, and only that portion becomes thicker, causing a step. This level difference is a considerable ratio in thin tatami mats. Therefore, the back sheet 6
If the notch is provided in the back sheet 6 so that the folded portion of the tatami table 10 is immersed in the notch, the thickness can be made uniform. That is, it is preferable to provide the non-slip back sheet 6 having a step difference thickness so that the back surface becomes smooth.
The total thickness of the thin tatami mat 9 thus manufactured is 12 to 1
It is about 5 mm.

FIG. 2 (B) is a partial cross-sectional view of the tatami floor 1a in the longitudinal direction, and shows a state where the tatami floor 3a is hooked on the net-like body 3 and stitched. In the tatami floor 1a, the sewing thread 7
Is fixed by the mesh member 3 embedded in the core member 4, so that the core member 4 and the plastic foam 5 are stitched tightly, and neither the sewing hole nor the expansion is seen.

FIG. 3A is a sectional view showing another example of a thin tatami mat using the tatami floor 1b of the present invention. A core material 4 of a tatami floor in which a mesh member 3 is inserted above the particle board 2 in the thickness direction.
And another core material 13 which is thinner than the core material 4 and has a thickness of about 10 tatami mats.
Are superimposed. The core material 13 is provided with a notch at the folded portion of the tatami table 10. Core material 4 and core material 1
3, and a plastic foam 5 was laminated on the front side of the core 4 and sewn and integrated to form a tatami floor 1b. The core 13 also has the mesh 12 inside the particle board 11, but since the core 13 is quite thin, the insertion position of the mesh 12 cannot be specified. As in the case of FIG. 2, a tatami table 10 is provided on the front side of the tatami floor 1b, and a back sheet 6 is provided on the back side of the tatami floor 1b via a hot melt adhesive 8 to prevent slippage, thereby completing a thin tatami 9b. Thin tatami 9b manufactured in this way
Has a total thickness of about 15 to 18 mm.

FIG. 3B is a partial cross-sectional view of the tatami floor 1b in the longitudinal direction, and shows a state where the tatami floor 1b is hooked and sewn to the mesh member 3. In the tatami floor 1b, the sewing thread 7
Is fixed by the mesh member 3 embedded in the core member 4 and the mesh member 12 embedded in the core member 13, so that the core member 4, the core member 13, and the plastic foam 5 can be stitched tightly and the sewing holes can be formed. No spread is seen.

FIG. 4A is a sectional view showing an example of a thin tatami mat using the tatami floor 1c of the present invention. As in the case of FIG. 2, a core material 4 of a tatami floor in which a mesh 3 made of a thermoplastic resin is inserted below the thickness direction of the particle board 2, and a plastic foam 5 is provided on the front side of the core material 4. On the back side, a back sheet 6 for non-slip was laminated. Here, unlike the case of FIG. 2, the core material 4, the plastic foam 5, and the back sheet 6 are also hooked and stitched to the net 3 by the sewing thread 7 to be stitched and integrated to form the tatami floor 1c. The tatami mat 10 is stacked on the tatami floor 1c in the same manner as in the case of FIG. 2, and the thin tatami mat 9c is completed. Thin tatami 9c manufactured in this way
Has a total thickness of about 13 to 15 mm.

FIG. 4B is a partial cross-sectional view of the tatami floor 1c in the longitudinal direction, showing a state where the tatami floor 3c is hooked and sewn on the net-like body 3. FIG. In the tatami floor 1c, the sewing thread 7
Is fixed by the mesh member 3 embedded in the core member 4, so that the core member 4, the plastic foam 5, and the back sheet 6 can be stitched tightly, and neither a sewing hole nor an expansion can be seen.

FIG. 5A is a partially enlarged perspective view showing a split web 14 obtained by uniaxially stretching a film vertically and splitting the film in a longitudinal direction as an example of a uniaxially oriented body forming a net used in the present invention. is there. The split web 14 made of a thermoplastic resin is made of a first thermoplastic resin and a second thermoplastic resin having a melting point lower than that of the first thermoplastic resin, using a multilayer inflation method, a multilayer T-die method, or the like. After stretching a multilayer film of at least two layers manufactured by extrusion molding in the longitudinal direction (length direction) to an elongation ratio of 1.1 to 15, preferably 3 to 10, using a splitter in a staggered manner in the same direction. It is split (split processing). As a result, the multilayer film becomes a net-like film, and the mesh is further widened to form a net-like split web 14. The split web 14 is a uniaxially oriented body having strength in the longitudinal direction over the entire width direction. In the figure, 15 is a trunk fiber and 16 is a branch fiber.

FIG. 5B is an enlarged perspective view of a portion B in FIG. 5A. The split web 14 is formed by laminating a second thermoplastic resin 18 on both surfaces of a first thermoplastic resin 17. It has a three-layer structure.

FIG. 6A shows, as another example of the uniaxially oriented body forming the network used in the present invention, a slit web formed by forming a plurality of slits in a film in the transverse direction and then uniaxially stretching in the transverse direction. It is a partial enlarged view. The slit web 19 made of a thermoplastic resin is formed by forming intermittent slits such as a staggered cross in a lateral direction (width direction), for example, with a hot blade in a portion other than the both ears of the multilayer film. The stretching ratio in the lateral direction is 1.1 to 15 times, preferably 3 to
It is a net-like body that is stretched 10 times to form a net-like film and further expands the mesh, and has strength in the lateral direction.
Preferably, the multilayer film is finely oriented by about 1.1 to 3 times in the longitudinal direction by rolling or the like, and then subjected to slit processing in a staggered manner in the horizontal direction with a hot blade, followed by transverse stretching.

FIG. 6B is an enlarged perspective view of a portion B in FIG. 6A. The slit web 19 is formed by laminating a second thermoplastic resin 18 on both surfaces of a first thermoplastic resin 17. 3
It has a layer structure.

FIG. 7 is a partially enlarged perspective view showing a uniaxially oriented multilayer tape as another example of the uniaxially oriented body forming the net-like body. The uniaxially oriented multilayer tape 20 made of a thermoplastic resin is made of a first thermoplastic resin and a second thermoplastic resin having a melting point lower than that of the first thermoplastic resin, using a multilayer inflation method and a multilayer T-die. Before and / or after cutting, at least two or more layers of a multilayer film produced by extrusion such as a method, are uniaxially oriented in a longitudinal and / or transverse direction at an elongation ratio of 1.1 to 15 times, preferably 3 to 10 times, This was cut into a multilayer stretched tape.
The uniaxially oriented multilayer tape 20 also has a three-layer structure in which the second thermoplastic resin 18 is laminated on both surfaces of the first thermoplastic resin 17 as described above.

FIGS. 8 to 10 show specific examples of a network made of a thermoplastic resin used in the present invention. FIG. 8 is a partial plan view of the nonwoven fabric 21 in which the split web 14 of FIG. 5 and the slit web 19 of FIG. 6 are laminated. FIG. 9 shows a nonwoven fabric 2 in which two split webs 14 of FIG.
1 is a partial plan view of FIG. FIG. 10 shows a uniaxially oriented multilayer tape 2
FIG. 1 is a partial plan view of a nonwoven fabric 21 in which two sets
1 is a partial perspective view of a woven fabric 22 in which a uniaxially oriented multilayer tape 20 is woven. As a specific example of the nonwoven fabric 21 which is an example of these air-permeable uniaxially oriented bodies, “Nisseki Warif (T)” (trade name, registered trademark, manufactured by Nisseki Plast Co., Ltd.)
Can be mentioned.

As the net in the present invention, a uniaxially stretched or biaxially stretched thermoplastic resin stretched net obtained by crossing warp yarns and weft yarns and fusing at the intersections is also used. . As the thermoplastic resin in this case, polyethylene, polypropylene, polyester, polyamide or the like is used, and the use of polypropylene is most preferable. A specific example of a stretched net made of thermoplastic resin is "Nisseki Conweed Net" (trade name, manufactured by Nisseki Sheet Pallet System Co., Ltd.)
Can be mentioned.

[0042]

EXAMPLES The present invention will be described more specifically with reference to the following Examples and Comparative Examples.

EXAMPLES AND COMPARATIVE EXAMPLES Production of Particle Board Particle chips with controlled ranges of length, width and thickness
Adhesive, release agent, viscosity adjustment
Mixing agent and curing agent, Nisseki Warif MS
-T (trade name, registered trademark, manufactured by Nisseki Plast Co., Ltd.)
Amount 30g / m ^Two, The thickness of 0.16 mm
Above or below the thickness of the article board
As described in JP-A-3-60015,
A particle board was created according to the method.

The mechanical strength of the particle board thus manufactured was evaluated. For comparison, a particle board having the same specification was manufactured without using a mesh body and evaluated similarly.

[0045]

[Table 1] From the comparison between the example and the comparative example in the above table, it was recognized that there was a remarkable difference between the bending strength and the Charpy strength.

Production of Thin Tatami A thin tatami was produced by using the particle board having the net formed therein and the particle board having no net formed therein in the above Examples and Comparative Examples as a core material. As shown in FIG. 1, the production of thin tatami mats has a thickness of 3.0 m on the front side of the core material 4.
m plastic foam was integrated with the mesh body 3 by hooking it with the sewing thread 7 and suturing. On the back side of the core material 4, a 4.0 mm thick non-slip back sheet 6 is provided.
Was bonded via a hot melt adhesive 8.

The tatami floor thus manufactured has a thickness of 2.
Tatami mats having a thickness of 5 mm were laminated to form a thin tatami mat having a thickness of 12.0 mm, and the state of sewing on the tatami mat floor was examined.

In the evaluation of the sewing state described above, in the tatami floor using the particle board of the embodiment having a net-like body as the core material, the seam tightness in the sewing between the core material and other components is extremely good. It was confirmed that there was no inconvenience that the yarn holes formed in the foam layer expanded in the yarn traveling direction. On the other hand, in the tatami floor using the particle board of the comparative example manufactured without the net-like body as the core material, the sewing tightness with other components is not good, and the thread formed in the foam layer is not good. There was a tendency to spread in the traveling direction of the yarn in the hole, and it was expected that various problems caused by this would occur.

Further, in the storage, transfer and use of thin tatami mats composed of tatami mat floors using a particle board having a net made of the thermoplastic resin of the present invention as a core material,
Even when used for a long period of time, there is no deterioration in quality as a thin tatami mat due to fatigue fracture of the core material layer, and no deterioration in quality due to repetition of thin tatami mat facilities is observed. In contrast, a remarkable difference in practical use was observed.

[0050]

According to the present invention, by using a particle board having a net made of thermoplastic resin therein as a core material,
An excellent tatami floor which is lightweight and thin, has excellent mechanical strength, and hardly causes warpage or shrinkage can be obtained. Further, this tatami floor does not require a back surface material for improving sewing tightness in sewing the core material and other constituent members, so that it is advantageous in cost and production.

[Brief description of the drawings]

FIG. 1 is an example of a partial sectional view showing a sewing state of a tatami floor of the present invention.

FIG. 2 is a sectional view showing an example of a thin tatami mat using the tatami floor 1a of the present invention.

FIG. 3 is a sectional view showing another example of a thin tatami mat using the tatami floor 1b of the present invention.

FIG. 4 is a cross-sectional view showing another example of a thin tatami mat using the tatami floor 1c of the present invention.

FIG. 5A is an example of a partially enlarged view showing a split web forming a net-like body, and FIG. 5B is a partially enlarged perspective view thereof.

FIG. 6A is an example of a partially enlarged perspective view showing a slit web forming a net-like body, and FIG. 6B is a partially enlarged perspective view of the slit web.

FIG. 7 is an example of a partially enlarged perspective view showing a uniaxially oriented multilayer tape forming a net-like body.

FIG. 8 is an example of a partial plan view of a nonwoven fabric obtained by laminating a split web and a slit web.

FIG. 9 is a partial plan view of a nonwoven fabric obtained by laminating two split webs in a 90 ° direction.

FIG. 10 is a partial plan view of a nonwoven fabric obtained by laminating two sets of uniaxially oriented multilayer tapes.

FIG. 11 is a partial perspective view of a woven fabric in which a uniaxially oriented multilayer tape is woven.

[Description of Signs] 1, 1a, 1b, 1c Tatami floor 2, 11 Particle board 3, 12 Reticulated body 4, 13 Core material 5 Foam 6 Back sheet 7 Sewing thread 8 Hot melt adhesive 9a, 9b, 9c Thin tatami 10 Tatami table 14 Split web 15 Trunk fiber 16 Branch fiber 17 First thermoplastic resin 18 Second thermoplastic resin 19 Slit web 20 Uniaxially oriented multilayer tape 21 Nonwoven fabric 22 Woven fabric

Claims (2)

[Claims] 1. A tatami floor using a particle board in which a net made of a thermoplastic resin is contained as a core material. 2. The method according to claim 1, wherein at least one core material made of a particle board in which the mesh made of the thermoplastic resin is embedded and another component forming the tatami floor are hooked and sewn to the mesh with a sewing thread. The tatami floor according to claim 1, characterized in that: