JP7254658B2 - tatami floor - Google Patents

Description

The present invention relates to tatami mats.

Conventionally, there has been proposed a tatami floor having a synthetic resin foam board or an insulation board as a constituent member. For example, in Patent Document 1, a mesh corrugated sheet, which is a mesh corrugated sheet made of synthetic resin, a first core material laminated on the upper surface of the mesh corrugate, and the mesh corrugate as a tatami floor with high impact relaxation properties. A tatami mat with a second core material laminated to the bottom surface is described. In the tatami floor disclosed in Patent Document 1, liner sheets are adhered to the upper and lower surfaces of the mesh corrugate. Also, an insulation board or a synthetic resin foam board is used as the first and second core materials.

JP 2016-199994 A

Since the mesh corrugate has a low buckling strength, the tatami floor is deformed by the pressure when forming the tatami mat. Therefore, when used for tatami mats, the mesh corrugated has a problem of inferior durability. Therefore, the tatami floor described in Patent Document 1 is not sufficient from the viewpoint of achieving both high impact cushioning properties and good durability, and there is room for further improvement.

An object of one aspect of the present invention is to realize a tatami floor having both high impact relaxation properties and good durability.

In order to solve the above problems, a tatami floor according to an aspect of the present invention includes a first layer made of polyethylene foam, a second layer made of glass fiber-containing polypropylene or a hollow molded body made of polypropylene, A third layer made of polypropylene foam with an expansion ratio of 30 to 60 times, a fourth layer made of extruded polystyrene foam, and a fifth layer made of a back sheet are laminated in this order to provide a tatami floor. When the total thickness is 100%, (i) the thickness of the second layer is 4% to 30%, and (ii) the thickness of the third layer is 21% to 65%. Configuration.

Further, in the tatami mat according to an aspect of the present invention, in the above configuration, the second layer is composed of a hollow molded body made of polypropylene, and when the thickness of the entire tatami mat is 100%, (i) the above The thickness of the second layer may be 10% to 30%, and (ii) the thickness of the third layer may be 21% to 53%.

Further, in the tatami mat according to an aspect of the present invention, in the above configuration, the second layer is composed of glass fiber-containing polypropylene, and when the thickness of the entire tatami mat is 100%, (i) the second The thickness of the layer may be between 4% and 21%, and (ii) the thickness of said third layer may be between 21% and 65%.

Further, in the tatami floor according to an aspect of the present invention, in the above configuration, the polypropylene foam of the third layer is preferably a plate-like member made of polypropylene foamed by a bead method.

According to one aspect of the present invention, it is possible to realize a tatami floor having both high impact relaxation properties and good durability.

1 is a cross-sectional view showing a schematic configuration of a tatami mat according to an embodiment of the present invention; FIG.

[Outline of one embodiment of the present invention]
As described above, conventional tatami mats are not sufficient from the viewpoint of achieving both high impact cushioning properties and good durability, and there is room for further improvement. Through independent development, the inventors of the present application have found that impact relaxation or durability varies depending on the type or thickness of the material layer laminated on the impact-absorbing layer made of polypropylene foam.

Then, the inventors of the present application set the plurality of layers that make up the tatami mat in a specific stacking order, the material of each layer in a specific material, and the thickness of the shock-absorbing layer and the layers above it in a specific numerical range. As a result, the present inventors have found new knowledge that a tatami floor having both high impact relaxation properties and good durability can be realized, leading to the present invention.

[Description of one embodiment of the present invention]
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail. However, the present invention is not limited to this, and various modifications are possible within the scope described, and embodiments obtained by appropriately combining technical means disclosed in different embodiments are also present. included in the technical scope of In this specification, unless otherwise specified, "A to B" representing a numerical range means "A or more and B or less". Also, "mass" and "weight" are considered synonymous.

FIG. 1 is a cross-sectional view showing a schematic configuration of a tatami mat 10 according to this embodiment. As shown in FIG. 1, the tatami floor 10 has a structure in which a first layer 1, a second layer 2, a third layer 3, a fourth layer 4, and a fifth layer 5 are laminated in this order. The first layer 1 consists of polyethylene foam. The second layer 2 is composed of glass fiber-containing polypropylene or a hollow molded body made of polypropylene. The third layer 3 is made of polypropylene foam with an expansion ratio of 30 to 60 times. The fourth layer 4 consists of extruded polystyrene foam. The fifth layer 5 is composed of a back sheet. Further, in the tatami mat 10, when the thickness of the entire tatami mat 10 (here, the thickness of the first layer 1 to the fifth layer 5) is 100%, (i) the thickness of the second layer 2 is (ii) the thickness of the third layer 3 is between 21% and 65%;

(first layer 1)
The first layer 1 is a member related to the user's stepping comfort when walking or the user's hardness during daily activities. The expansion ratio of the polyethylene foam constituting the first layer 1 is 15 to 40 times, preferably 20 to 35 times, more preferably 25 to 30 times.

Polyethylene foam is produced by adding a pyrolytic chemical foaming agent to polyethylene and kneading it, heating the mixture to a temperature higher than the thermal decomposition temperature of the foaming agent, or by using a liquefied inert gas as the foaming agent. It is particularly limited as long as it can be obtained by injecting it into the polyethylene in a molten state in the extruder from the middle of the extruder cylinder, kneading it, and extruding it out of the extruder to foam it. not a thing Considering productivity and cost, the polyethylene foam is preferably a foamed polyethylene sheet formed by an extrusion foaming method (hereinafter sometimes referred to as an extruded polyethylene sheet).

When the extruded polyethylene sheet is composed of a non-crosslinked foamed polyethylene sheet, the non-crosslinked foamed polyethylene sheet is formed by extruding the polyethylene into a sheet shape while forming countless closed cells. is preferred. Such a non-crosslinked foamed polyethylene sheet is excellent in water resistance, heat insulation, sound insulation, and stress dispersion, and is excellent in terms of foot comfort when the user walks or hardness during the user's daily activities. is. Examples of the non-crosslinked foamed polyethylene sheet include Miramat (registered trademark) manufactured by JSP Corporation.

Also, the thickness of the first layer 1 is preferably 0.5 mm to 5 mm, more preferably 1 mm to 4 mm, and particularly preferably 2 mm to 3 mm. Furthermore, when the thickness of the first layer 1 to the fifth layer 5 is 100%, the thickness of the first layer 1 is preferably 1% to 11%, more preferably 2% to 9%. Yes, particularly preferably 4% to 7%.

(Second layer 2)
The second layer 2 has a function to reinforce the tatami floor 10, and is composed of glass fiber-containing polypropylene or a hollow molded body made of polypropylene. By using the above material for the second layer 2, the tatami floor 10 can be obtained which has little dimensional change due to temperature change, is less likely to warp under the influence of temperature change, relaxes stress concentration, and is easy to disperse stress. be able to.

The glass fiber-containing polypropylene is formed into a sheet by mixing a fiber material into a resin, and has a high bending elastic modulus, and can improve the bending elastic modulus of the tatami floor constituent material.

Examples of the fiber material include glass fiber, carbon fiber, boron fiber, metal fiber, ceramic fiber, polyester fiber, vinyl chloride-acrylonitrile copolymer fiber, and polyvinyl alcohol fiber, which are excellent in strength and dimensional stability. Glass fibers are preferred, and long glass fibers are particularly preferred.

Examples of the resin include synthetic resins such as polypropylene resin, polyethylene resin, polystyrene resin, polyvinyl chloride resin, polyvinylidene chloride resin, and unsaturated polyester resin. Polyolefin resins such as polypropylene resin and polyethylene resin are preferred, and polypropylene resin is particularly preferred.

Examples of the glass fiber-containing polypropylene include a sheet obtained by impregnating a fiber sheet in which a plurality of continuous fibers made of continuous glass fibers having a fiber diameter of 5 to 36 μm are bundled and arranged in one direction with a polypropylene resin. Further, it is more preferable to laminate the above sheets so that the fiber directions of the sheets are orthogonal to each other.

The content of the glass fiber in the glass fiber-containing polypropylene is not particularly limited, but is preferably 40 wt% to 80 wt%, more preferably 45 wt% to 70 wt%, still more preferably 50% to 60% by weight. If the glass fiber content is within the above range, there is a tendency to easily obtain the tatami mat 10 that undergoes little dimensional change due to temperature change and is less likely to warp due to the influence of temperature change.

Since the glass fiber-containing polypropylene is excellent in tensile strength, it can easily impart a high flexural modulus to the tatami floor constituent material and the tatami floor with a small thickness. As a result, it is possible to increase the thickness of the plate-like body within a predetermined thickness range and to reduce the density, thereby contributing to weight reduction of the tatami mat.

Moreover, the hollow molded article made of polypropylene preferably has a structure in which a surface sheet made of polypropylene is arranged on both sides of a hollow sheet made of polypropylene, on which hollow frustum-shaped projections protrude.

There are one or two hollow sheets. When the number of the hollow sheets is one, the hollow molded body has a three-layer structure in which the hollow sheet is used as a core material and the surface sheets are bonded to both sides of the core material. An example of the three-layer structure hollow molding is Single Cone (registered trademark) manufactured by Ube Exsimo Co., Ltd. Further, when the number of hollow sheets is two, the hollow molded body is formed by heat-sealing the hollow frustum-shaped protrusions protruding from the hollow sheets in abutted state as a core material, It has a four-layer structure in which the surface sheets are attached to both sides of the core material. An example of the four-layer structure hollow molded body is Twin Cone (registered trademark) manufactured by Ube Exsimo Co., Ltd. In terms of obtaining a tatami floor 10 that undergoes little dimensional change due to temperature changes, is less likely to warp due to the effects of temperature changes, and has reduced stress concentration and stress distribution, the hollow molded body preferably includes the above-mentioned It has a four-layer structure.

When the thickness of the entire tatami mat (here, the thickness of the first layer 1 to the fifth layer 5) is 100%, the thickness of the second layer 2 is 4% to 30%, preferably 6%. % to 25%, more preferably 10% to 23%. Also, the thickness of the second layer 2 is preferably 2 mm to 15 mm, more preferably 3 mm to 13 mm, and particularly preferably 5 mm to 12 mm. If the thickness of the second layer 2 is within the above range, the tatami floor 10 can achieve both high impact relaxation and good durability. The "thickness of the whole tatami mat" here means the sum of the thicknesses of the layers from the first layer 1 to the fifth layer 5. As shown in FIG. Also, the thickness of each layer from the first layer 1 to the fifth layer 5 can be measured by disassembling the tatami floor 10 .

Moreover, when the second layer 2 is composed of a hollow molded body made of polypropylene, the thickness of the second layer 2 is preferably defined as follows. That is, the thickness of the second layer 2 is 10% to 30% when the thickness of the entire tatami mat (here, the thickness of the first layer 1 to the fifth layer 5) is 100%. It is preferably 14% to 25%, more preferably 18% to 23%, and the thickness of the second layer 2 is 5 mm to 15 mm, preferably 7 mm to 13 mm, more preferably 9 mm. ~12 mm.

Moreover, when the second layer 2 is composed of glass fiber-containing polypropylene, the thickness of the second layer 2 is preferably defined as follows. That is, when the thickness of the entire tatami mat (here, the thickness of the first layer 1 to the fifth layer 5) is 100%, the thickness of the second layer 2 is 4% to 21%, which is preferable. is 6% to 15%, more preferably 10% to 15%. Also, the thickness of the second layer 2 is 2 mm to 11 mm, preferably 3 mm to 8 mm, and more preferably 5 mm to 7 mm.

(Third layer 3)
The third layer 3 has a shock absorbing effect and is made of polypropylene foam with an expansion ratio of 30 to 60 times. Examples of the method for producing the polypropylene foam include a bead foaming method, an extrusion foaming method, a normal pressure foaming method, and the like. Expanded particles constituting polypropylene foam are commercially available, for example, as Eperan-PP manufactured by Kaneka Co., Ltd., and are readily available.

The expansion ratio of the polypropylene foam is 30 to 60 times, preferably 40 to 50 times, more preferably 40 to 45 times. When the expansion ratio of the polypropylene foam is within the above range, the tatami floor 10 having excellent impact relaxation properties tends to be easily obtained.

In addition, when the thickness of the entire tatami mat (here, the thickness of the first layer 1 to the fifth layer 5) is 100%, the thickness of the third layer 3 is 21% to 65%, which is preferable. is 24% to 52%, more preferably 26% to 40%. Also, the thickness of the third layer 3 is preferably 10 mm to 32 mm, more preferably 12 mm to 26 mm, and particularly preferably 13 mm to 20 mm. If the thickness of the third layer 3 is within the above range, the tatami floor 10 can achieve both high impact relaxation and good durability.

Moreover, when the second layer 2 is composed of a hollow molded body made of polypropylene, the thickness of the third layer 3 is preferably defined as follows. That is, when the thickness of the entire tatami mat (here, the thickness of the first layer 1 to the fifth layer 5) is 100%, the thickness of the third layer 3 is 21% to 53%, which is preferable. is 24% to 43%, more preferably 26% to 33%. Also, the thickness of the second layer 2 is 10 mm to 26 mm, preferably 12 mm to 21 mm, and more preferably 13 mm to 16 mm.

Moreover, when the second layer 2 is made of glass fiber-containing polypropylene, the thickness of the third layer 3 is preferably defined as follows. That is, when the thickness of the entire tatami mat (here, the thickness of the first layer 1 to the fifth layer 5) is 100%, the thickness of the third layer 3 is 21% to 65%, which is preferable. is 26% to 51%, more preferably 30% to 37%. Also, the thickness of the second layer 2 is 10 mm to 32 mm, preferably 13 mm to 25 mm, and more preferably 15 mm to 18 mm.

(4th layer 4)
The fourth layer 4 acts as an insulating core and consists of extruded polystyrene foam. Extruded polystyrene foam is a board composed of expanded polystyrene formed by an extrusion foaming process. Since the fourth layer 4 is made of extruded polystyrene foam, the shape of the tatami floor 10 is stabilized.

Examples of the production method using the extrusion foaming method for polystyrene foam include the following methods. First, a styrenic resin composition obtained by adding additives such as a flame retardant, a cell regulator, a lubricant, an inorganic compound, etc. to a styrenic resin as necessary is supplied to a heating and melting means such as an extruder, and an arbitrary The mixture is heated to about 150-260° C. under high pressure conditions to obtain a molten styrenic resin composition. Then, a foaming agent is added to the styrene-based resin composition to form a fluid gel, which is then cooled to a temperature suitable for extrusion foaming, and the fluid gel is extruded and foamed in a low-pressure region through a die. The styrenic resin is not particularly limited, and for example, a styrene homopolymer obtained by polymerizing only a styrene monomer; random, block or graft copolymers obtained by copolymerization; modified polystyrene such as post-brominated polystyrene and rubber-reinforced polystyrene; mixtures of these resins; As the styrene-based resin, a styrene homopolymer is more preferable from the viewpoint of workability.

Examples of polystyrene foams formed by an extrusion foaming method include Kanelite foam (registered trademark) manufactured by Kaneka Corporation, Kanelite tatami foam, and the like.

The expansion ratio of the extruded polystyrene foam is preferably 20 to 40 times, more preferably 27 to 38 times, still more preferably 33 to 37 times. When the expansion ratio of the extruded polystyrene foam is within the above range, the tatami floor 10 having excellent shape stability tends to be easily obtained.

Further, the density of the extruded polystyrene foam is preferably 16.3 kg/m ³ to 32.6 kg/m ³ , more preferably 21.7 kg/m ³ to 31.3 kg/m ³ , still more preferably 27 kg/m ³ to 30 kg/m ³ . If the density of the extruded polystyrene foam is within the above range, the tatami floor 10 with excellent shape stability tends to be easily obtained. The density of the extruded polystyrene foam is "the density of the extruded polystyrene foam (kg/m ³ ) = {mass (g) of the extruded polystyrene foam/volume of the extruded polystyrene foam (mm ³ )} x 10 ⁶ ". Calculated by

In addition, when the thickness of the entire tatami mat (here, the thickness of the first layer 1 to the fifth layer 5) is 100%, the thickness of the fourth layer 4 is 20% to 82%, which is preferable. is 40% to 61%, more preferably 50% to 55%. The thickness of the fourth layer 4 is preferably 10 mm to 41 mm, more preferably 20 mm to 30 mm, particularly preferably 25 mm to 27 mm.

(5th layer 5)
The fifth layer 5 is composed of a backsheet. Examples of the back sheet include a polypropylene woven fabric sheet obtained by fabricating polypropylene threads or polypropylene narrow belts. The back sheet can prevent wear of the tatami floor 10 . The back sheet is not particularly limited as long as it can prevent abrasion of the tatami mat 10, and conventionally known sheets can be employed.

Also, the thickness of the fifth layer 5 is preferably 1 mm or less, more preferably 0.5 mm or less.

(Tatami floor 10)
The tatami floor 10 has a structure in which a first layer 1, a second layer 2, a third layer 3, a fourth layer 4, and a fifth layer 5 are laminated in this order. The tatami floor 10 has a tatami facing on the first layer 1 if necessary. Note that other layers may be provided before and after each layer as long as the effects of the embodiment of the present invention are not impaired.

The first layer 1, the second layer 2, the third layer 3, the fourth layer 4, and the fifth layer 5 are fixed to each other, for example, by bonding with an adhesive, sewing with sewing thread, or fastening with staples or the like. It is preferable that As a result, the first layer 1, the second layer 2, the third layer 3, the fourth layer 4, and the fifth layer 5 are integrated, and the shape of the tatami mat 10 is stabilized. Furthermore, the tatami floor 10 is less likely to warp due to changes in humidity and temperature.

The tatami facing may be fixed to the upper portion of the first layer 1 by, for example, bonding with an adhesive so as to wrap around the peripheral portion of the tatami floor 10, or may be fixed using a tatami edge made of cloth or the like and sewn. It may be fixed by sewing with.

The weight of the tatami mat 10 is not particularly limited, but is preferably 2.4 kg/m ² to 3.1 kg/m ² , more preferably 2.5 kg/m ² to 3.0 kg/m ^{2 .} is.

The thickness of the tatami floor 10 is preferably 45 mm to 65 mm, more preferably 45 mm to 55 mm.

The tatami floor 10 according to this embodiment can be used in facilities such as kindergartens, nursery schools, nursing homes, and hospitals, for example.

The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in the embodiments It is included in the technical scope of the present invention.

[Method for measuring physical properties]
(A) local compression (unit: mm), (B) thermal resistance (unit: mK/W), (C) hardness during rollover collision (unit: m/s ² ), and (D) during daily operation The hardness (unit: none) conforms to JIS A 5917 (impact relaxation type tatami floor). In addition, the performance evaluation criteria for items (A) to (C) were also based on JIS A 5917.

(E) Repeated compression (unit: mm) was measured using a repeated compression tester manufactured by Kobunshi Keiki Co., Ltd. The cyclic compression tester has two sample stands, and these sample stands are interlocked with each other. Also, the sample table has an upper panel and a lower panel. A tatami floor 10 is installed on the bottom panel. The lower board reciprocates toward or away from the upper board. The upper board is provided with a pressure member protruding toward the lower board. Due to the reciprocating motion of the bottom floor, the tatami floor 10 is repeatedly brought into contact with and separated from the pressure member. As a result, the tatami floor 10 is repeatedly subjected to a constant period of load via the pressurizing portion, and the tatami floor 10 is repeatedly compressed. The specifications of the cyclic compression tester are as follows.

Sample table dimensions: 309 x 309 mm
Maximum distance between the upper board and the lower board: 150mm
Upper panel mass: 20kg (196.1N)
Setting range of repeated load: 20kg to 60kg (196.1N to 588.4N)
Cycle setting range of repeated load: 10 times/min to 60 times/min
Shape of pressurizing part: Cylindrical shape of φ30 mm When measuring repeated compression, the load was set to 35 kg, the cycle of the repeated load was set to about 53 times/min, and the distance between the upper surface of the tatami floor 10 and the upper board was measured. 40 mm, and a repeated load was applied to the tatami floor 10 . At this time, the upper surface of the tatami floor 10 is repeatedly brought into contact with and separated from the pressurizing portion by reciprocating motion of the lower floor up and down. When the upper surface of the tatami floor 10 abuts against the pressurizing portion, the upper board is lifted, and a load is applied to the tatami floor 10 by the weight of the upper board. In addition, by separating the upper surface of the tatami floor 10 from the pressurizing portion, the load on the tatami floor 10 due to the weight of the upper board is eliminated. In this manner, a load was repeatedly applied to the tatami floor 10, and the time was set so that the tatami floor 10 was repeatedly compressed about 50,000 times by the pressure unit (about 15.7 hours).

The amount of compression of the tatami floor 10 by the pressure unit after repeated compression 50,000 times was measured. When the amount of compression was less than 3 mm, the durability of the tatami floor 10 was evaluated as good.

[Example 1]
A tatami mat 10 shown in FIG. 1 was produced. Miramat (registered trademark) manufactured by JSP Co., Ltd. and having a thickness of 2 mm was used as the first layer 1 . As the second layer 2, Twin Cone (registered trademark) manufactured by Ube Exsimo Co., Ltd. and having a thickness of 9 mm was used. As the third layer 3, a 13 mm-thick plate made of polypropylene foamed by a bead method with an expansion ratio of 40 times (manufactured by Kaneka Co., Ltd.: Eperan-PP 40 times foamed product) was used. As the fourth layer 4, Kanelite tatami foam made by Kaneka Corporation and having a thickness of 25 mm was used. As the fifth layer 5, a polypropylene woven fabric sheet with a thickness of 0.3 mm was used.

A first layer 1, a second layer 2, a third layer 3, a fourth layer 4, and a fifth layer 5 were laminated in this order and fixed with a sewing thread to prepare a tatami floor 10. FIG.

(A) local compression, (B) heat resistance, (C) hardness during falling collision, (D) hardness during daily operation, and (E) repeated compression were measured for the tatami floor 10 thus produced. As a result, (A) the local compression was 3 mm, (B) the thermal resistance was 1.2 mK/W, (C) the hardness at the time of crash was 430 m/ ^s2 , and (D) during daily operation. was 1.0, and (E) repeated compression was 1.7 mm. From the measurement values of items (A) to (D), it was found that the produced tatami floor 10 satisfies the performance evaluation criteria based on JIS A 5917. In addition, from the measured values of item (E), it was found that the produced tatami floor 10 had good durability. From these results, as shown in Table 1, it was found that the tatami floor 10 of this example had both high impact relaxation properties and good durability. Table 1 shows the evaluation results of the physical property values of the produced tatami floor 10 .

(Example 2)
A tatami mat 10 was produced in the same manner as in Example 1, except for the following points.

As the second layer 2, a glass fiber-containing polypropylene (GFPP) (GF-PP pressboard manufactured by Morimer SP Co., Ltd.) having a thickness of 5 mm was used. The thickness of the third layer 3 was set to 15 mm. The thickness of the fourth layer 4 was set to 27 mm.

(A) local compression, (B) heat resistance, (C) hardness during falling collision, (D) hardness during daily operation, and (E) repeated compression were measured for the tatami floor 10 thus produced. As a result, (A) the local compression was 3 mm, (B) the thermal resistance was 1.3 mK/W, (C) the hardness at crash was 490 m/ ^s2 , and (D) during daily operation. was 1.0, and (E) repeated compression was 1.7 mm. From the measurement values of items (A) to (D), it was found that the produced tatami floor 10 satisfies the performance evaluation criteria based on JIS A 5917. In addition, from the measured values of item (E), it was found that the produced tatami floor 10 had good durability. From these results, as shown in Table 1, it was found that the tatami floor 10 of this example had both high impact relaxation properties and good durability. Table 1 shows the evaluation results of the physical property values of the produced tatami floor 10 .

[Comparative Example 1]
A tatami mat 10 shown in FIG. 1 was produced. Miramat (registered trademark) manufactured by JSP Co., Ltd. and having a thickness of 2 mm was used as the first layer 1 . As the second layer 2, an insulation board (manufactured by Daiken Kogyo Co., Ltd.) having a thickness of 15 mm was used. As the third layer 3, a 10-mm-thick, 45-fold expansion ratio bead-process polypropylene plate (manufactured by Kaneka: Eperan-PP 45-fold expansion product) was used. As the fourth layer 4, Kanelite tatami foam made by Kaneka Corporation and having a thickness of 23 mm was used. As the fifth layer 5, a polypropylene woven fabric sheet with a thickness of 0.3 mm was used.

A first layer 1, a second layer 2, a third layer 3, a fourth layer 4, and a fifth layer 5 were laminated in this order and fixed with a sewing thread to prepare a tatami floor 10. FIG.

(A) local compression, (B) thermal resistance, (C) hardness at falling collision, and (E) repeated compression were measured for the tatami floor 10 thus produced. As a result, (A) the local compression was 3.5 mm, (B) the thermal resistance was 1.2 mK/W, (C) the hardness at the time of rollover collision was 456 m/ ^s2 , and (E) repetition Compression was 8.6 mm. It was found that the measured values of items (A) to (C) satisfy the performance evaluation criteria according to JIS A 5917. Also, (D) hardness during daily operation has not been measured, but it is presumed that it satisfies the performance evaluation criteria based on JIS A 5917 from the measured values of items (A) to (C). Therefore, it was found that the produced tatami floor 10 satisfies the performance evaluation criteria based on JIS A 5917. On the other hand, the measured value of item (E) revealed that the produced tatami floor 10 had poor durability. From these results, as shown in Table 1, it was found that the tatami floor 10 of this comparative example had high impact relaxation properties, but had poor durability. Table 1 shows the evaluation results of the physical property values of the produced tatami floor 10 .

[Comparative Example 2]
A tatami mat 10 was produced in the same manner as in Comparative Example 1, except for the following points.

As the second layer 2, a laminate was used in which a 2.5 mm thick veneer plate and a 15 mm thick Kanelite tatami foam made by Kaneka Corporation were laminated in this order from the first layer 1 side. The thickness of the fourth layer 4 was set to 20 mm.

(A) local compression, (B) thermal resistance, (C) hardness at falling collision, and (E) repeated compression were measured for the tatami floor 10 thus produced. As a result, (A) the local compression was 2.9 mm, (B) the thermal resistance was 1.4 mK/W, (C) the hardness at the time of rollover collision was 516 m/ ^s2 , and (E) repetition Compression was 1.2 mm. From the measurement values of items (A) to (C), it was found that the produced tatami floor 10 did not satisfy the performance evaluation criteria based on JIS A 5917. On the other hand, it was found from the measured values of item (E) that the produced tatami floor 10 had good durability. From these results, as shown in Table 1, it was found that the tatami floor 10 of this comparative example had good durability, but had low impact relaxation properties. Table 1 shows the evaluation results of the physical property values of the produced tatami floor 10 .

[Comparative Example 3]
A tatami mat 10 was produced in the same manner as in Comparative Example 1, except for the following points.

As the second layer 2, a glass fiber-containing polypropylene (GFPP) (GF-PP pressboard manufactured by Morimer SP Co., Ltd.) with a thickness of 5 mm from the first layer 1 side and Kanelite manufactured by Kaneka Co., Ltd. with a thickness of 15 mm A laminate in which tatami foams were laminated in this order was used. The thickness of the fourth layer 4 was set to 17 mm.

(A) local compression, (B) thermal resistance, (C) hardness at falling collision, and (E) repeated compression were measured for the tatami floor 10 thus produced. As a result, (A) the local compression was 2.3 mm, (B) the thermal resistance was 1.4 mK/W, (C) the hardness at the time of rollover collision was 527 m/ ^s2 , and (E) repetition Compression was 1.6 mm. From the measurement values of items (A) to (C), it was found that the produced tatami floor 10 did not satisfy the performance evaluation criteria based on JIS A 5917. On the other hand, it was found from the measured values of item (E) that the produced tatami floor 10 had good durability. From these results, as shown in Table 1, it was found that the tatami floor 10 of this comparative example had good durability, but had low impact relaxation properties. Table 1 shows the evaluation results of the physical property values of the produced tatami floor 10 .

[Comparative Example 4]
A tatami mat 10 was produced in the same manner as in Comparative Example 1, except for the following points.

As the second layer 2, a glass fiber-containing polypropylene (GFPP) (GF-PP pressboard manufactured by Morimer SP Co., Ltd.) having a thickness of 5 mm was used. The thickness of the fourth layer 4 was set to 32 mm.

(A) local compression, (B) thermal resistance, (C) hardness at falling collision, and (E) repeated compression were measured for the tatami floor 10 thus produced. As a result, (A) the local compression was 2.3 mm, (B) the thermal resistance was 1.3 mK/W, (C) the hardness at the time of rollover collision was 515 m/ ^s2 , and (E) repetition Compression was 1.8 mm. From the measurement values of items (A) to (C), it was found that the produced tatami floor 10 did not satisfy the performance evaluation criteria based on JIS A 5917. On the other hand, it was found from the measured values of item (E) that the produced tatami floor 10 had good durability. From these results, as shown in Table 1, it was found that the tatami floor 10 of this comparative example had good durability, but had low impact relaxation properties. Table 1 shows the evaluation results of the physical property values of the produced tatami floor 10 .

[Comparative Example 5]
A tatami mat 10 was produced in the same manner as in Comparative Example 1, except for the following points.

The thickness of the second layer 2 was set to 10 mm. As the third layer 3, a 12-mm-thick, 30-fold expanded polypropylene plate made by the bead method (manufactured by Kaneka Co., Ltd.: Eperan-PP 30-fold expanded product) was used. The thickness of the fourth layer 4 was set to 25 mm.

(A) local compression, (B) thermal resistance, (C) hardness at falling collision, and (E) repeated compression were measured for the tatami floor 10 thus produced. As a result, (A) the local compression was 2.7 mm, (B) the thermal resistance was 1.2 mK/W, (C) the hardness at the time of rollover collision was 462 m/ ^s2 , and (E) repetition Compression was 13.0 mm. It was found that the measured values of items (A) and (C) satisfy the performance evaluation criteria according to JIS A 5917. In addition, (D) hardness during daily operation has not been measured, but it is estimated that it meets the performance evaluation criteria based on JIS A 5917 from the measured values of items (A), (B) and (C). . Therefore, it was found that the produced tatami floor 10 satisfies the performance evaluation criteria based on JIS A 5917. On the other hand, the measured value of item (E) revealed that the produced tatami floor 10 had poor durability. From these results, as shown in Table 1, it was found that the tatami floor 10 of this comparative example had high impact relaxation properties, but had poor durability. Table 1 shows the evaluation results of the physical property values of the produced tatami floor 10 .

[Comparative Example 6]
A tatami mat 10 was produced in the same manner as in Comparative Example 1, except for the following points.

As the third layer 3, a 10-mm-thick, 30-fold expanded polypropylene plate made by a bead method (manufactured by Kaneka Co., Ltd.: Eperan-PP 30-fold expanded product) was used. The thickness of the fourth layer 4 was set to 22 mm.

(A) local compression, (B) thermal resistance, (C) hardness at falling collision, and (E) repeated compression were measured for the tatami floor 10 thus produced. As a result, (A) the local compression was 2.5 mm, (B) the thermal resistance was 1.2 mK/W, (C) the hardness at the time of rollover collision was 523 m/ ^s2 , and (E) repetition Compression was 8.6 mm. From the measured value of item (C), it was found that the produced tatami floor 10 did not satisfy the performance evaluation criteria based on JIS A 5917. Also, from the measured value of item (E), it was found that the produced tatami floor 10 had poor durability. From these results, as shown in Table 1, it was found that the tatami floor 10 of this comparative example had both poor impact relaxation properties and durability. Table 1 shows the evaluation results of the physical property values of the produced tatami floor 10 .

[Comparative Example 7]
A tatami mat 10 was produced in the same manner as in Comparative Example 1, except for the following points.

As the second layer 2, a 10 mm thick insulation board (manufactured by Daiken Kogyo Co., Ltd.) and a 25 mm thick Kanelite tatami foam manufactured by Kaneka Corporation are laminated in this order from the first layer 1 side. used the body. As the third layer 3, a 12 mm-thick plate made of polypropylene foamed by a bead method with an expansion ratio of 40 times (manufactured by Kaneka Co., Ltd.: Eperan-PP 40 times foamed product) was used.

The fourth layer 4 was removed. Therefore, the tatami floor 10 of this comparative example has a structure in which the first layer 1, the second layer 2, the third layer 3, and the fifth layer 5 are laminated in this order.

(A) local compression, (B) thermal resistance, (C) hardness at falling collision, and (E) repeated compression were measured for the tatami floor 10 thus produced. As a result, (A) the local compression was 2.6 mm, (B) the thermal resistance was 1.2 mK/W, (C) the hardness at the time of rollover collision was 572 m/ ^s2 , and (E) repetition Compression was 2.8 mm. From the measured value of item (C), it was found that the produced tatami floor 10 did not satisfy the performance evaluation criteria based on JIS A 5917. In addition, from the measured values of item (E), it was found that the produced tatami floor 10 had good durability. From these results, as shown in Table 1, it was found that the tatami floor 10 of this comparative example had good durability, but had low impact relaxation properties. Table 1 shows the evaluation results of the physical property values of the produced tatami floor 10 .

[Comparative Example 8]
A tatami mat 10 was produced in the same manner as in Comparative Example 1, except for the following points.

As the second layer 2, a 15 mm thick insulation board (manufactured by Daiken Kogyo Co., Ltd.) and a 22 mm thick Kanelite tatami foam manufactured by Kaneka Corporation are laminated in this order from the first layer 1 side. used the body. As the third layer 3, a 10-mm-thick, 40-fold expanded polypropylene plate made by the bead method (manufactured by Kaneka Co., Ltd.: Eperan-PP 40-fold expanded product) was used.

The fourth layer 4 was removed. Therefore, the tatami floor 10 of this comparative example has a structure in which the first layer 1, the second layer 2, the third layer 3, and the fifth layer 5 are laminated in this order.

(A) local compression, (B) thermal resistance, (C) hardness at falling collision, and (E) repeated compression were measured for the tatami floor 10 thus produced. As a result, (A) the local compression was 2.5 mm, (B) the thermal resistance was 1.2 mK/W, (C) the hardness at the time of rollover collision was 544 m/ ^s2 , and (E) repetition Compression was 3.0 mm. From the measured value of item (C), it was found that the produced tatami floor 10 did not satisfy the performance evaluation criteria based on JIS A 5917. Also, from the measured value of item (E), it was found that the produced tatami floor 10 had poor durability. From these results, as shown in Table 1, it was found that the tatami floor 10 of this comparative example had both poor impact relaxation properties and durability. Table 1 shows the evaluation results of the physical property values of the produced tatami floor 10 .

The invention can be used, for example, in facilities such as kindergartens or nursery schools, nursing homes, hospitals, and the like.

1 First layer 2 Second layer 3 Third layer 4 Fourth layer 5 Fifth layer 10 Tatami floor

Claims (4)

a first layer composed of polyethylene foam;
A second layer composed of glass fiber-containing polypropylene or a hollow molded body made of polypropylene,
A third layer made of polypropylene foam with an expansion ratio of 30 to 60 times,
a fourth layer made of extruded polystyrene foam and a fifth layer made of a backing sheet laminated in this order;
When the thickness of the entire tatami mat is 100%, (i) the thickness of the second layer is 4% to 30%, and (ii) the thickness of the third layer is 21% to 65%. The tatami floor. The second layer is composed of a hollow molded body made of polypropylene,
When the thickness of the entire tatami mat is 100%, (i) the thickness of the second layer is 10% to 30%, and (ii) the thickness of the third layer is 21% to 53%. The tatami mat according to claim 1, wherein: The second layer is composed of glass fiber-containing polypropylene,
When the thickness of the entire tatami mat is 100%, (i) the thickness of the second layer is 4% to 21%, and (ii) the thickness of the third layer is 21% to 65%. The tatami mat according to claim 1, wherein: The tatami floor according to any one of claims 1 to 3, wherein the polypropylene foam of the third layer is a plate-shaped member made of polypropylene foamed by a bead method.

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