JP2021028442A - Floor sheet for sports facility - Google Patents

Abstract

To provide a floor sheet for a sports facility excellent in impact absorption and ball repulsion while making the overall thickness relatively small.SOLUTION: A floor sheet for a sports facility comprises, in order from the upper side, a laminated structure which has a non-foamed resin layer 2, a fiber reinforced layer 3 containing glass fibers, and a foamed resin layer 4 having a thickness of 2.9 mm to 5 mm, and has a ball rebound rate of 90% or more, and a G-value of 100 or less, and a thickness of 4 mm to 6 mm.SELECTED DRAWING: Figure 2

Description

The present invention relates to a floor sheet laid in a sports facility such as a gymnasium.

Flooring materials are laid on the floors of various sports facilities such as gymnasiums, indoor sports facilities such as fitness gyms, and outdoor sports facilities such as outdoor tennis courts and outdoor futsal courts.
As the floor material for indoor sports facilities, a wood-based floor material such as plywood is generally used, but as described in Patent Document 1, a floor sheet made of synthetic resin is also known.

Japanese Unexamined Patent Publication No. 2019-073858

By the way, for example, in gymnasiums, ball games such as basketball and handball are often performed, and in fitness gyms, exercises using balls are also performed. For the safety of the user, the floor material of such a sports facility is required to have excellent shock absorption, and further, to have excellent ball resilience. Further, from the viewpoint of storage / transportation and ease of construction, a floor material having a relatively small overall thickness is required.
However, the floor material having high ball resilience tends to have low impact absorption, and it is difficult to satisfy both performances at a high level with a floor material having a relatively small thickness.

An object of the present invention is to provide a floor sheet for a sports facility having excellent shock absorption and ball resilience while making the overall thickness relatively small.

The floor sheet for sports facilities of the present invention has a laminated structure having a non-foamed resin layer, a fiber reinforcing layer containing glass fibers, and a foamed resin layer having a thickness of 2.9 mm to 5 mm in this order from the top. It has a ball repulsion rate of% or more and a G value of 100 or less, and has a thickness of 4 mm to 6 mm.

In the preferred floor sheet for sports facilities of the present invention, the thickness of the non-foamed resin layer is 0.8 mm to 1.8 mm.
In the preferred floor sheet for sports facilities of the present invention, the non-foamed resin layer has a surface layer and a design layer in this order from the top, and the total thickness of the surface layer and the design layer is 0.5 mm to 1. It is 8 mm.

The floor sheet for sports facilities of the present invention is suitable as a floor sheet used in a facility where a ball bounces sufficiently and a ball game such as basketball or volleyball is performed. In addition, the floor sheet for sports facilities of the present invention is also excellent in shock absorption, so that it is highly safe for facility users.
By using the floor sheet for sports facilities of the present invention, it is possible to construct a sports facility floor having both excellent ball repulsion rate and shock absorption.

A plan view of a floor sheet for a sports facility according to one embodiment of the present invention as viewed from the surface side. An enlarged cross-sectional view of the floor sheet cut along the line II-II of FIG. Enlarged sectional view of the floor sheet according to another embodiment. The graph which shows the correlation of the G value and the thickness of a foamed resin layer.

Hereinafter, the present invention will be described with reference to the drawings as appropriate.
In the present specification, the "front surface" or "upper side" of a layer refers to the surface or direction on the side far from the floor base on which the floor sheet for sports facilities is laid, and the "back surface" or "lower side" is the opposite side ( Refers to the surface or direction of the floor (the side near the floor base on which the floor sheet is laid).
In the present specification, the numerical range represented by "lower limit value X to upper limit value Y" means a lower limit value X or more and an upper limit value Y or less. When a plurality of the numerical range are described separately, it is possible to select an arbitrary lower limit value and an arbitrary upper limit value and set "arbitrary lower limit value to arbitrary upper limit value".
Also, please note that the dimensions such as thickness and size in each figure are different from the actual ones.

[Floor sheet]
FIG. 1 is a plan view of a floor sheet 1 for a sports facility (hereinafter, the floor sheet 1 for a sports facility of the present invention may be referred to as “floor sheet 1”), and FIG. 2 is an enlarged cross section of the floor sheet 1. It is a figure.
As shown in FIG. 1, the floor sheet 1 is formed in a long strip shape in a plan view. In the present specification, the long strip is a rectangular shape in which the length in one direction is sufficiently longer than the length in the other direction (the other direction is orthogonal to one direction), for example, one direction. The length of is twice or more, preferably four times or more the length in the other direction. The long strip-shaped floor sheet 1 is usually wrapped in a roll and used for storage and transportation, and is cut into a desired shape and used at a construction site. However, the floor sheet 1 of the present invention is not limited to the long strip-shaped sheet, and may be in the form of tiles formed in a single-wafer shape such as a square shape in a plan view (not shown).

The long strip-shaped floor sheet 1 is formed to have a predetermined width such as a width of 800 mm to 4000 mm and a predetermined length, and the length thereof is, for example, 2 m to 300 m. The floor sheet 1 formed in a single-wafer shape has, for example, 100 mm to 4000 mm in length and width, respectively. The single-wafer-shaped floor sheet 1 is generally square in plan view, but may be rectangular or hexagonal in plan view, and its size and shape are not particularly limited.
For anti-slip, the outermost surface of the floor sheet 1 may be finely embossed (not shown), if necessary. Further, for the laying stability of the floor sheet 1, the backmost surface of the floor sheet 1 may be embossed (not shown), if necessary.
The floor sheet 1 of the present invention has flexibility. As for the degree of flexibility of the floor sheet 1, for example, the floor sheet 1 of the present invention can be wound around a core material having a diameter of 15 cm in a roll shape.
The floor sheet 1 of the present invention has a laminated structure including a non-foamed resin layer 2, a fiber reinforcing layer 3 containing glass fibers, and a foamed resin layer 4 in this order from top to bottom.

<Non-foamed resin layer>
The non-foamed resin layer 2 includes a layer forming the outermost surface of the floor sheet 1 and is firmly bonded to the fiber reinforced layer 3 so as not to be peeled off.
The thickness of the non-foamed resin layer 2 is not particularly limited, but if it is too large, the floor sheet 1 may become too hard, and if it is too small, the surface of the floor sheet 1 may not be sufficiently protected. From this point of view, the thickness of the non-foamed resin layer 2 is preferably 0.8 mm to 1.8 mm, more preferably 0.9 mm to 1.7 mm, and 1.0 mm to 1.5 mm. It is more preferable to have. When the non-foamed resin layer 2 is equal to or more than the lower limit value, the ball repulsion rate of the floor sheet 1 can be increased while having good shock absorption due to the foamed resin layer. Further, when the non-foamed resin layer 2 is not more than the upper limit value, it is possible to prevent the floor sheet 1 from being lowered in shock absorption.

Further, fine irregularities may be formed on the outermost surface of the non-foamed resin layer 2. Examples of such unevenness include unevenness forming a satin pattern (so-called satin embossing) and unevenness forming a wood grain pattern (so-called wood grain embossing). The depth of the unevenness (depth of the concaveness) is, for example, 20 μm to 120 μm, preferably 30 μm to 100 μm. For example, the depth of the unevenness of the wood grain pattern is, for example, 10 μm to 60 μm, and the depth of the unevenness of the satin pattern is, for example, 30 μm to 70 μm.

The non-foamed resin layer 2 may be composed of one layer or two or more layers. The non-foaming resin layer 2 does not include a foamed layer (the non-foaming resin layer 2 is a non-foaming layer as a whole).
The non-foamed resin layer 2 has, for example, a surface layer 22 for preventing stains and a design layer 23 representing a design in order from above, preferably a protective layer 21 forming the outermost surface and prevention of stains in order from above. 22 for designing, and more preferably, a protective layer 21 forming the outermost surface, a surface layer 22 for preventing stains, and a design layer representing the design, in order from the top. It has 23 and an intermediate layer 24 to be joined to the fiber reinforcing layer 3.
The outermost surface of the non-foamed resin layer 2 (the outermost surface of the floor sheet 1) preferably has anti-slip properties. As an index of anti-slip property on the outermost surface, for example, the slip resistance coefficient at the time of drying, at the time of wetting, and at the time of wetting and the presence of dust is preferably included in the range of 0.45 to 0.95. It is more preferable that all of them are contained in the range of 0.50 to 0.90. Values in this range are slip resistance coefficients suitable for sports, proposed by Tokyo Institute of Technology.
The floor sheet 1 having the slip resistance coefficient can be obtained by appropriately selecting the material of the non-foamed resin layer 2 and / or the fine irregularities on the outermost surface of the floor sheet 1.
The slip coefficient of slip resistance during drying, wetting, and in the presence of wet and dust is determined by measuring the outermost surface of the floor sheet in accordance with the "diagonal tensile test" of JIS A 1454: 2016.
Specifically, the sole of the shoe actually used (the rubber sole of a commercially available gymnasium shoe) was attached to a sliding piece ^{having a bottom area of 56 cm 2} having a pulling side end having an inclination of 30 °. The shoe bottom of this slip piece is placed on the surface of the floor sheet to be measured, and with a load of 80 kg (785 N) applied to the slip piece, the tensile load speed is 80 kg / min and the temperature is 18 ° with respect to the surface of the floor sheet. The value obtained by dividing the maximum tensile force at the time of pulling in the direction and starting to slide by the load (CSR value) was defined as the slip resistance coefficient. The slip coefficient is measured when dry (normal state where the surface of the floor sheet is not wet), when wet (when the surface of the floor sheet is wet), and when wet and dust is present (the surface of the floor sheet is wet). , In the presence of dust).

In FIG. 2, the non-foamed resin layer 2 is composed of a four-layer laminate consisting of a protective layer 21, a surface layer 22, a design layer 23, and an intermediate layer 24 in this order from the top. In addition, non-foaming means that it is not foamed, in other words, it is a medium substance.

The protective layer 21 is a layer forming the outermost surface of the floor sheet 1, and is provided as needed. However, when the protective layer 21 is not provided, the lower layer thereof constitutes the outermost surface of the floor sheet 1.
The protective layer 21 is preferably a layer provided to impart abrasion resistance and scratch resistance to the surface of the floor sheet 1. The slip resistance coefficient of the protective layer 21 forming the outermost surface of the floor sheet 1 is preferably 0.45 to 0.95, more preferably 0.50 to 0.90, as described above. ..
The protective layer 21 may be transparent or opaque, but when the design layer 23 is provided, the protective layer 21 is preferably transparent so that the design display can be visually recognized. The protective layer 21 is a non-foaming layer.

The protective layer 21 is made of, for example, a resin material. The resin material is not particularly limited, but is preferably formed from a relatively hard resin layer. As the resin material of the protective layer 21, it is preferable to use a curable resin composition because of its good processability, and it is more preferable to use an ionizing radiation curable resin composition because of its versatility. It is more preferable to use a sex resin composition. Examples of the curable resin composition include thermosetting resins and resin compositions that are cured by non-ionizing radiation, in addition to ionizing and radiation curable resins such as ultraviolet curable resins. It is preferable that the protective layer 21 does not contain aggregate particles such as alumina.

The ultraviolet curable resin composition contains at least one of a curable monomer and an oligomer and a photopolymerization initiator, and further comprises a solvent, a leveling agent, fine particles, a filler, a dispersant, a plasticizer, an ultraviolet absorber, and the like. It contains at least one additive selected from surfactants, antioxidants, thixotropic agents and the like. As the curable resin composition such as the ultraviolet curable resin composition, a commercially available product may be used. The uncured coating film of a commercially available product can be formed by applying it to the surface layer as it is or after adjusting the viscosity as needed.
Examples of the commercially available ultraviolet curable resin composition include Aurex (manufactured by China Paint Co., Ltd.), ADEKA PUTMER (manufactured by Asahi Denka Kogyo Co., Ltd.), Koei Hard (manufactured by Koei Chemical Industry Co., Ltd.), and the like. Examples include Seika Beam (manufactured by Dainichi Seika Kogyo Co., Ltd.), EBECRYL (manufactured by Daicel Cytec Co., Ltd.), Unidic (manufactured by DIC Corporation), and Sunrad (manufactured by Sanyo Kasei Kogyo Co., Ltd.).
The thickness of the protective layer 21 is not particularly limited, but is, for example, 0.001 mm to 0.1 mm, preferably 0.005 mm to 0.07 mm, and preferably 0.01 mm to 0.05 mm.

The surface layer 22 is provided as necessary in order to impart scratch resistance and stain resistance to the floor sheet 1 and to easily remove stains adhering to the floor sheet 1. The surface layer 22 may be transparent or opaque, but is preferably transparent for the same reason as the protective layer 21. The surface layer 22 is a non-foaming layer.
The surface layer 22 is made of, for example, a resin material. As the resin material, a thermoplastic resin is generally used. Examples of the thermoplastic resin include vinyl chloride resins such as vinyl chloride and vinyl chloride-vinyl acetate copolymers; polyolefin resins; urethane resins; vinyl acetate resins such as ethylene-vinyl acetate copolymers; ethylene-methacrylates. Acrylic resins such as resins; polyamide resins; ester resins; various elastomers such as olefin elastomers and styrene elastomers; rubber and the like can be mentioned. These can be used alone or in combination of two or more. The surface layer 22 is preferably formed of a vinyl chloride composition containing a vinyl chloride resin as a main component, because it is firmly bonded to the design layer 23 and the like.
In the present specification, the main component resin refers to the most abundant component (weight ratio) among the resin components (however, excluding additives) constituting the layer. The amount of the main component resin exceeds 50% by weight, preferably 70% by weight or more, and more preferably 80% by weight or more, assuming that the entire resin component constituting the layer is 100% by weight. The upper limit of the amount of the main component resin is 100% by weight. When the amount of the main component resin is less than 100% by weight, the resin other than the main component resin contained in the layer is not particularly limited, and a known resin component can be used.

When the surface layer 22 is formed from the vinyl chloride composition, either the paste vinyl chloride resin or the suspension vinyl chloride resin may be used as the vinyl chloride resin. A paste vinyl chloride resin is preferable because it can be firmly bonded to the design layer 23 and has excellent workability during manufacturing.
The vinyl chloride composition forming the surface layer 22 preferably contains 45% by weight to 80% by weight of a vinyl chloride resin and 15% by weight to 50% by weight of a plasticizer such as DOP, with the whole being 100% by weight. The vinyl chloride composition may contain additives, if necessary. As the additive, conventionally known ones can be used, and examples thereof include flame retardants, stabilizers, hygroscopic agents, antioxidants, lubricants, colorants, fungicides and the like. The vinyl chloride resin may contain a filler such as calcium carbonate, but the vinyl chloride resin may not contain a filler such as calcium carbonate because a layer having excellent transparency can be formed. preferable.
The thickness of the surface layer 22 is not particularly limited, and is, for example, 0.2 mm to 1.5 mm, more preferably 0.5 mm to 1.0 mm. In particular, when a relatively thin design printing film is used as the design layer, the floor sheet 1 having excellent durability can be formed by setting the thickness of the surface layer 22 to 0.5 mm or more.

The design layer 23 is a layer that imparts a design to the floor sheet 1 by causing the floor sheet 1 to express colors and patterns. The design layer 23 is provided as needed. The design layer 23 is a non-foaming layer. The design represented by the design layer 23 is not particularly limited, and examples thereof include an arbitrary pattern, a heather pattern, a wood grain pattern, and a stone grain pattern.
Examples of the design layer 23 include a design printing film and a colored resin sheet. However, the design layer 23 is not limited to these exemplified layers, and any other layer that can express the design can be used.
As the design printing film, a printing ink (ink containing a colorant and a binder resin such as vinyl chloride) printed on a resin film and solidified can be used. As the colored resin sheet, for example, a resin colored with a pigment or the like (for example, a vinyl chloride resin as the main component resin) processed into a sheet can be used.

When the design layer 23 is formed from the vinyl chloride composition, either the paste vinyl chloride resin or the suspension vinyl chloride resin may be used as the vinyl chloride resin. Since it is harder than the paste vinyl chloride resin, it is preferable to use the suspension vinyl chloride resin for the design layer 23.
The thickness of the design layer 23 is not particularly limited, but is, for example, 0.002 mm to 0.3 mm, preferably 0.005 mm to 0.2 mm.
When the design layer 23 is a design printing film, its thickness is not particularly limited, but is, for example, 0.002 mm to 0.03 mm, preferably 0.005 mm to 0.02 mm. When the design layer 23 is a colored resin sheet, its thickness is 0.1 mm to 0.3 mm, preferably 0.12 mm to 0.2 mm.
When the non-foamed resin layer 2 has the surface layer 22 and the design layer 23, the total thickness of the surface layer 22 and the design layer 23 is preferably 0.5 mm to 1.8 mm, preferably 0.5 mm to 1. It is more preferably 1.6 mm. When the total thickness is not less than the lower limit, even if the surface of the floor sheet 1 is scraped by a shoe sole or the like, the disappearance of the design of the design layer can be suppressed, and when the total thickness is not more than the upper limit, it is good. Can maintain good shock absorption.

The intermediate layer 24 is a layer provided for joining the non-foamed resin layer 2 to the fiber reinforced layer 3. If the design layer 23 or the surface layer 22 can be directly bonded to the fiber reinforced layer 3, the intermediate layer 24 may be omitted. The intermediate layer 24 is a non-foaming layer.
The intermediate layer 24 is made of, for example, a resin material. As the resin material, a thermoplastic resin is generally used. Examples of the thermoplastic resin include those exemplified in the above-mentioned surface layer 22. Since the intermediate layer 24 is also firmly bonded to the design layer 23 and the like, it is preferably formed from the above-mentioned vinyl chloride-based resin as a main component.

When the intermediate layer 24 is formed from the vinyl chloride composition, either the paste vinyl chloride resin or the suspension vinyl chloride resin may be used as the vinyl chloride resin. It is preferable to use a paste vinyl chloride resin for the intermediate layer 24 because it can be firmly bonded to the fiber reinforcing layer 3.
The vinyl chloride composition forming the intermediate layer 24 has 100% by weight as a whole, 15% by weight to 80% by weight of a vinyl chloride resin, 0% by weight to 70% by weight of a filler such as calcium carbonate, DOP and the like. It is preferable that the plasticizer is contained in an amount of 10% by weight to 50% by weight. In addition, 0% by weight of the filler means that the filler is not contained. The vinyl chloride composition may contain additives, if necessary. As the additive, conventionally known ones can be used, and examples thereof include flame retardants, stabilizers, hygroscopic agents, antioxidants, lubricants, colorants, fungicides and the like.
The thickness of the intermediate layer 24 is not particularly limited, and is, for example, 0.2 mm to 0.8 mm, preferably 0.3 mm to 0.7 mm.

<Fiber reinforcement layer>
The fiber reinforced layer 3 is a layer for suppressing dimensional change or warpage of the floor sheet 1 due to shrinkage or expansion over time.
The fiber reinforcing layer 3 is formed by forming fibers containing glass fibers into a sheet shape. The fiber reinforcing layer 3 may be composed of only glass fibers, or the fibers may be composed of glass fibers and mixed fibers of fibers other than glass fibers. The fiber reinforcing layer 3 in which the fibers are composed of only glass fibers and the fiber reinforcing layer 3 in which the fibers are composed of mixed fibers are not limited to the case where the fibers are composed only of fibers, and a binder (for example, a resin material or an adhesive) for binding the fibers is used. And various additives may be included. As the binder, a binder having excellent bondability to glass fibers is preferable, and a binder having excellent bondability to glass fibers, the foamed resin layer 4 and the intermediate layer 24 is more preferable. As such a binder, an adhesive containing a known resin as a main component can be used. For example, a one-component adhesive, a two-component adhesive, a thermosetting adhesive, a hot melt adhesive, etc. Examples thereof include an electron beam curable adhesive such as an ultraviolet curable adhesive. Specifically, one kind or a mixture of two or more kinds selected from urethane-based resin, vinyl acetate-based resin, styrene-butadiene copolymer-based, acrylic-based resin, vinyl chloride-based resin and epoxy-based resin is exemplified.
The mixed fiber contains 80% by weight or more of glass fiber when the total amount of the mixed fiber is 100% by weight. Examples of fibers other than glass fibers include synthetic resin fibers such as polyester and polyolefin; inorganic fibers such as carbon fibers (inorganic fibers other than glass fibers); and natural fibers such as pulp.
The form of the fiber reinforcing layer 3 may be a non-woven fabric or a woven fabric. The fiber reinforcing layer 3 is preferably a non-woven fabric containing glass fibers, and more preferably a non-woven fabric in which the fibers are only glass fibers, because the effect of suppressing dimensional change is high.
Basis weight of the fiber-reinforced layer 3 is not particularly limited, for ^example, a ^{20g / m 2 ~120g / m 2} , ^{preferably, 30g / m 2 ~80g / m} 2, more preferably, 40 g / m ^{It is 2 to} 60 g / m ² . By using the fiber reinforcing layer 3 having the basis weight, it is possible to form the floor sheet 1 having sufficient strength and having a ball repulsion rate of 90% or more.
The thickness of the fiber reinforcing layer 3 is not particularly limited, and is, for example, 0.1 mm to 0.3 mm.

<Foam resin layer>
The foamed resin layer 4 is laminated on the back surface of the fiber reinforcing layer 3.
The foamed resin layer 4 is firmly bonded to the fiber reinforced layer 3 so that it cannot be peeled off.
The foamed resin constituting the foamed resin layer 4 is not particularly limited, but is a vinyl chloride resin such as vinyl chloride or a vinyl chloride-vinyl acetate copolymer; a urethane resin such as polyurethane; a polyolefin resin such as polypropylene; ethylene. -Vinyl acetate resin such as vinyl acetate copolymer; styrene resin such as polystyrene; acrylic resin such as ethylene-methacrylate resin; polyamide resin; ester resin such as polyethylene terephthalate; thermoplastic resin, epoxy resin such as Such as reactive resin and the like. These resins can be used alone or in combination of two or more. Preferably, the foamed resin layer 4 contains vinyl chloride, polyurethane, or polyolefin. The foamed resin layer 4 containing a vinyl chloride resin as a main component resin has excellent processability and is relatively inexpensive. The foamed resin layer 4 containing a urethane-based resin or a polyolefin-based resin as a main component resin has an advantage that it has excellent flexibility and is easily adapted to a floor base having a complicated shape such as a curved surface.

When the foamed resin layer 4 contains a vinyl chloride resin as a main component resin, the foamed resin layer 4 is formed by foaming a vinyl chloride composition.
As the vinyl chloride resin of the foamed resin layer 4, either a paste vinyl chloride resin or a suspension vinyl chloride resin may be used. It is preferable to use a paste vinyl chloride resin for the foamed resin layer 4 because it can be firmly bonded to the fiber reinforcing layer 3.
The vinyl chloride composition forming the foamed resin layer 4 has 100% by weight as a whole, 15% by weight to 80% by weight of a vinyl chloride resin, 0% by weight to 70% by weight of a filler such as calcium carbonate, and DOP. It is preferable to contain 10% by weight to 50% by weight of a plasticizer such as. In addition, 0% by weight of the filler means that the filler is not contained. The vinyl chloride composition may contain additives, if necessary. As the additive, conventionally known ones can be used, and examples thereof include flame retardants, stabilizers, hygroscopic agents, antioxidants, lubricants, colorants, fungicides and the like.

The foaming method of the resin composition for forming the foamed resin layer 4 is not particularly limited, and may be any of a chemical foaming method, a mechanical foaming method, and a physical foaming method, and an existing foaming agent such as hollow beads. Or foaming using heat-expandable microcapsules may be used.

The foaming ratio of the foamed resin layer 4 is not particularly limited, but if it is too small, the shock absorption is lowered, and if it is too large, the ball repulsion rate is lowered. From this point of view, the foaming ratio of the foamed resin layer 4 is preferably 1.5 times to 3.5 times, more preferably 2.0 times to 3.0 times.
The thickness of the foamed resin layer 4 is 2.9 mm to 5 mm, preferably 3.2 mm to 4 mm. By setting the thickness of the foamed resin layer 4 to 2.9 mm to 5 mm, it is possible to form the floor sheet 1 having both excellent shock absorption and ball repulsion rate.

<Floor sheet>
The thickness of the floor sheet 1 of the present invention (thickness of the entire floor sheet 1) is 4 mm to 6 mm, preferably 4.2 mm to 5 mm, and more preferably 4.5 mm to 5 mm. As described above, the floor sheet 1 having a small overall thickness is convenient for storage and transportation, and can be easily installed.
Further, the floor sheet 1 of the present invention has a ball repulsion rate of 90% or more and a G value of 100 or less. Since the ball repulsion rate is 90% or more, in a sports facility with the floor sheet 1 as the floor surface, the ball bounces sufficiently and is suitable as a facility for playing ball games such as basketball and volleyball. On the other hand, since the G value is 100 or less, the sports facility with the floor sheet 1 as the floor surface is a facility with high safety for the facility user.
However, the ball repulsion rate refers to a value measured according to the European standard for sports flooring, "vertical ball behavior of Standard EN 12235".
The G value refers to the value of the maximum acceleration measured with respect to the floor sheet 1 according to JIS A 6519.

Further, the floor sheet 1 of the present invention preferably has a specific gravity of 650 to 800. When the specific gravity is equal to or higher than the lower limit value, the floor sheet 1 having sufficient strength can be formed, and when the specific gravity is equal to or lower than the upper limit value, the floor sheet 1 having good shock absorption can be formed.
The specific gravity of the floor sheet 1 was measured using an electronic gravity meter (trade name "ELECTRONIC DENSIMETER") manufactured by Alpha Mirage Co., Ltd. in accordance with the method for measuring the density and specific gravity by the in-liquid weighing method of JIS Z 8807. Say something.

The floor sheet 1 of the present invention has a laminated structure of a non-foamed resin layer 2, a fiber reinforcing layer 3 containing glass fibers, and a foamed resin layer 4 in this order from the top. When a relatively lightweight object such as a ball falls on the surface of the floor sheet 1, the non-foamed resin layer 2 and the fiber reinforced layer 3 receive it on the surface and then sufficiently repel it upward. On the other hand, when a relatively heavy object such as a person falls on the surface of the floor sheet 1, the non-foamed resin layer 2 and the fiber reinforced layer 3 sink downward while receiving it on the surface, and the sinking is caused by the foamed resin. Layer 4 absorbs. By such an action, the floor sheet 1 of the present invention can realize excellent shock absorption and high ball resilience.

[Floor sheet according to another embodiment]
In the above embodiment, the surface layer 22 and the design layer 23 are separate layers, but the surface layer may not be provided.
For example, FIG. 3 is a cross-sectional view of a floor sheet according to another embodiment.
With reference to FIG. 3, the floor sheet 1 has a laminated structure in which the non-foamed resin layer 2, the fiber reinforced layer 3, and the foamed resin layer 4 are laminated in this order. The non-foamed resin layer 2 is composed of a laminate of a protective layer 21, a design layer 25, and an intermediate layer 24 in this order from the top.
The protective layer 21 is directly bonded to the surface of the design layer 25.

For such a design layer 25, for example, a colored resin sheet (for example, a resin sheet such as a vinyl chloride resin colored with a pigment or the like) can be used. Since the surface layer is not laminated, the design layer 25 having a relatively large thickness can be used without increasing the overall thickness of the floor sheet 1. In other words, if the surface layer is omitted, the overall thickness of the floor sheet 1 does not increase even if the thickness of the design layer 25 is increased by the thickness thereof. When the design layer 25 having such a large thickness is used, there is an advantage that the design is unlikely to disappear even if the protective layer 21 disappears with time and the surface of the design layer 25 is scraped by a shoe sole or the like.

Further, the floor sheet 1 of the present invention is not limited to the laminated structure of the non-foamed resin layer 2, the fiber reinforced layer 3 and the foamed resin layer 4, and for example, the backing layer, the adsorption layer and the adhesive layer are formed on the back surface of the foamed resin layer 4. At least one selected from the above may be laminated (not shown). The backing layer can be formed of a non-woven fabric, a woven fabric, or the like. The strength of the floor sheet 1 can be increased by laminating the backing layers of the non-woven fabric and / and the woven fabric. The adsorption layer or the adhesive layer can be formed of a resin having an adsorptive or adhesive property at room temperature. By providing the adsorption layer or the adhesive layer, it is possible to attach the floor sheet 1 to the floor base without using an adhesive or the like when laying the floor sheet 1.

[Floor sheet construction method]
The floor sheet 1 of the present invention is laid on the floor base of various sports facilities, and is particularly preferably used on the floor surface of indoor sports facilities such as gymnasiums and fitness gyms.
The floor sheet 1 may be laid on a newly constructed floor base, or may be laid on an existing floor base.
In the construction of a new construction, the floor sheet 1 is attached on the floor base by using, for example, an adhesive and / or an adhesive tape. The floor base may be concrete, mortar, or the like, or a wood-based base such as plywood may be laid on a steel double floor. As for the floor base, the latter is more shock-absorbing than the former, and the shock-absorbing property of the steel double floor is added to the shock-absorbing property of the floor sheet 1, and the floor surface having high shock-absorbing property can be constructed by the synergy of both.
Further, in the existing construction, the floor sheet 1 may be attached to the existing floor material (preferably a wood-based floor material such as flooring) as a floor base by using an adhesive or the like, or the existing floor material 1 may be attached. It may be pasted on the floor base after removing the floor material, or may be pasted on the repaired or refurbished floor base after removing the existing floor material. When laying the floor sheet 1 using the existing flooring material as the floor base, it can be used as it is as the floor base without peeling off the deteriorated floor material, so the floor surface of the sports facility can be easily repaired. be able to.

[Floor sheet manufacturing method]
The floor sheet 1 of the present invention can be manufactured, for example, as follows.
The resin composition for forming the foamed resin layer is applied onto the conveyor in layers having a predetermined thickness. As the resin composition for forming the foamed resin layer, a vinyl chloride composition containing a paste vinyl chloride resin as a main component is preferable as described above. A fiber reinforced layer such as a glass non-woven fabric is placed on the layered resin composition, and then the resin composition for forming an intermediate layer is applied in a layered form having a predetermined thickness on the fiber reinforced layer. As the resin composition for forming the intermediate layer, a vinyl chloride composition containing a paste vinyl chloride resin as a main component is preferable as described above. A fiber reinforced layer such as a glass non-woven fabric is placed on the layered resin composition, a design layer such as a colored resin sheet is placed on the fiber reinforced layer, and then a surface layer is placed on the design layer. The resin composition for formation is applied in a layer having a predetermined thickness. The obtained laminate is heated at, for example, 160 ° C. to 200 ° C. If necessary, it may be heated while pressurizing. In this way, the vinyl chloride composition is gelled.
If necessary, the surface of the laminated body is embossed using an embossing roll or the like to form fine irregularities. Finally, a resin such as an ultraviolet curable resin is applied to the surface of the laminate in a layer having a predetermined thickness, and this is cured.
In this way, the floor sheet 1 composed of the non-foamed resin layer 2 (protective layer 21, surface layer 22, design layer 23 and intermediate layer 24) / fiber reinforced layer 3 / foamed resin layer 4 is obtained.

By forming both the foamed resin layer 4 and the intermediate layer 24 with a resin composition containing a paste vinyl chloride resin as a main component, each paste vinyl chloride resin composition is formed in the fiber reinforced layer 3 from above and below the fiber reinforced layer 3. Is impregnated into a gel. In particular, it is preferable that the foamed resin layer 4 and the intermediate layer 24 gel in contact with each other in the fiber reinforced layer 3. Therefore, the foamed resin layer 4 and the intermediate layer 24 are firmly bonded to the fiber reinforced layer 3, respectively, and the foamed resin layer 4 and the intermediate layer 24 are also bonded inside the fiber reinforced layer 3. By integrating the fiber reinforcing layer 3, the foamed resin layer 4, and the intermediate layer 24 in this way, the ball repulsion rate can be increased. Further, since the intermediate layer 24 and the foamed resin layer 4 are joined inside the fiber reinforced layer 3, the impact applied to the non-foamed resin layer 2 including the intermediate layer 24 is diffused smoothly to the foamed resin layer 4. Will be. Therefore, the floor sheet 1 having an excellent G value can be constructed. The floor sheet 1 of the present invention has excellent shock absorption even though it has a relatively small thickness of 4 mm to 6 mm.
When the surface layer 22, the design layer 23, and the intermediate layer 24 of the non-foamed resin layer 2 are formed of a resin composition containing a vinyl chloride resin as a main component, each layer is a suspension vinyl chloride resin or a paste vinyl chloride resin. However, it is preferable that at least one layer selected from these layers contains a suspension vinyl chloride resin as a main component. As a result, the rigidity is increased, so that the ball repulsion rate can be increased without increasing the thickness of the floor sheet 1.
Further, in the non-foamed resin layer 2, when all the layers adjacent to each other are suspension vinyl chloride resins, the bonding force tends to be weakened. From this point of view, when at least one layer of each layer constituting the non-foamed resin layer 2 is formed of a resin composition containing a suspension vinyl chloride resin as a main component, it is adjacent to the layer containing the suspension vinyl chloride resin as a main component. It is preferable that at least one of the two layers is mainly composed of a paste vinyl chloride resin. By doing so, the layer containing the paste vinyl chloride resin as the main component is firmly bonded to the layer containing the suspension vinyl chloride resin as the main component, and the layers are difficult to separate from each other. Further, it is more preferable that both of the two adjacent layers are made of a paste vinyl chloride resin as a main component because the bonding force is further increased. By using at least one of the layers adjacent to the non-foamed resin layer 2 as a main component of the paste vinyl chloride resin, it is possible to provide a floor sheet 1 suitable for a sports facility having sufficient durability. Since the interlayer strength is increased, it also has the effect of increasing the ball repulsion rate.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the present invention is not limited to the following examples.

[Material used]
-Protective layer A colorless and transparent urethane acrylate-based UV-curable resin paint. This coating material contains a urethane acrylate monomer and oligomer, a photopolymerization initiator such as benzoin ether, a defoaming agent, a leveling agent, a matting agent, and the like, and is itself a liquid that can be applied.
A vinyl chloride composition obtained by mixing 100 parts by weight of a paste vinyl chloride resin (K value: 94), 40 parts by weight of a plasticizer (DOP), and a small amount of stabilizer on the surface layer. Hereinafter, it is referred to as a vinyl chloride composition for forming a surface layer.
・ Design layer (A)
A design printing film with a thickness of 0.01 mm.
・ Design layer (B)
A colored soft vinyl chloride resin sheet (suspension vinyl chloride resin) having a thickness of 0.15 mm.
・ Intermediate layer 100 parts by weight of paste vinyl chloride resin (K value: 68), 40 parts by weight of plasticizer (mixture of DOP and DOA), 60 parts by weight of filler (calcium carbonate) and a small amount of stabilizer were mixed. Vinyl chloride composition. Hereinafter, it is referred to as a vinyl chloride composition for forming an intermediate layer.
-Fiber reinforced layer glass non-woven fabric. Metsuke amount: 53 g / m ² . Thickness about 0.2 mm.
-Foam resin layer 100 parts by weight of paste vinyl chloride resin (K value: 68), 50 parts by weight of plasticizer (DOP), 30 parts by weight of filler (calcium carbonate), 2.5 parts by weight of foaming agent (ADCA) ), And a vinyl chloride composition mixed with a small amount of stabilizer. Hereinafter, it is referred to as a vinyl chloride composition for forming a foamed resin layer.

[Example 1]
A vinyl chloride composition for forming a foamed resin layer is applied in a layer having a thickness of about 1.5 mm on a flat conveyor that has been subjected to a mold release treatment, and then a glass non-woven fabric is placed on the glass non-woven fabric. , The vinyl chloride composition for forming an intermediate layer is applied in a layer having a thickness of about 0.6 mm, the design layer (A) is placed on the layer, and the vinyl chloride composition for forming a surface layer is placed on the layer (A). A laminate was prepared by applying in a layer of .35 mm.
This laminate was heated to 200 ° C. to foam the vinyl chloride composition for forming the foamed resin layer, and the vinyl chloride composition for forming each layer was gelled.
Finally, a urethane acrylate-based ultraviolet curable resin paint is applied to the surface of this laminate with a uniform thickness by a roller coating method to form an uncured coating film, and then irradiated with ultraviolet rays with an electrodeed ultraviolet lamp. By curing, a protective layer having a thickness of about 0.02 mm was formed.
In this way, in order from the surface side, about 0.02 mm protective layer / about 0.35 mm surface layer / about 0.01 mm design layer (A) / about 0.6 mm intermediate layer / about 0.2 mm fiber. A floor sheet composed of a reinforcing layer / a foamed resin layer having a thickness of about 3.32 mm was produced.
The foaming ratio of the foamed resin layer was 2.2 times.

[Examples 2 to 6]
As shown in Table 1, a floor sheet was produced in the same manner as in Example 1 except that the thickness of the surface layer, the thickness of the intermediate layer, and the thickness of the foamed resin layer were changed. Since the coating thickness of the vinyl chloride composition for forming the foamed resin layer can be calculated from the thickness of the foamed resin layer and the foaming ratio (2.2 times) of the foamed resin layer, the description thereof will be omitted.
The unit of the thickness of each layer shown in Table 1 is mm (millimeter).

[Example 7]
A floor sheet was produced in the same manner as in Example 1 except that a soft vinyl chloride resin sheet (design layer (B)) was used instead of the design layer (A).

[Comparative Examples 1 to 4]
As shown in Table 2, a floor sheet was produced in the same manner as in Example 1 except that the thickness of the intermediate layer and the thickness of the foamed resin layer were changed.
The unit of the thickness of each layer shown in Table 2 is mm (millimeter).

[Comparative Example 5]
A laminated body was prepared by placing a glass non-woven fabric on a flat conveyor subjected to a mold release treatment, and applying a vinyl chloride composition for forming a foamed resin layer on the glass non-woven fabric in a layer having a thickness of about 2.0 mm. ..
By heating this laminate to 200 ° C. to foam and gel the vinyl chloride composition for forming the foamed resin layer, the foamed resin layer of about 4.3 mm / the fiber of about 0.2 mm is sequentially formed from the surface side. A floor sheet composed of a reinforcing layer was produced.

[Measurement method of G value]
The G value was measured for the floor sheets of Examples and Comparative Examples according to JIS A 6519: 2013 (floor hardness test method). The results are shown in Tables 1 and 2.
Specifically, the floor sheet was fixed to a flat surface made of concrete with the back surface side facing the flat surface using a commercially available double-sided adhesive tape. A weight (3.85 kgf) modeled after a human head was dropped from a specified height (20 cm) on the surface of the floor sheet, and the maximum acceleration (G value) was measured using an accelerometer. It can be said that the smaller the G value, the better the shock absorption, unlike the simple evaluation of the softness and elasticity of the surface.

[Measurement method of ball repulsion rate]
The ball repulsion rate was measured according to "Standard ball behaviour" of Standard EN 12235, which is a standard for flooring materials for sports in Europe.
Specifically, a basketball was naturally dropped from a height of 2 m on a flat surface made of concrete, and the bounce height of the ball was measured. This measurement was performed three times, and the average value was calculated (this average value is called a reference value).
Next, the floor sheets of Examples and Comparative Examples to be measured were fixed to the concrete flat surface with a commercially available double-sided adhesive tape with the back surface side facing the flat surface. A basketball was naturally dropped on the surface of the floor sheet from a height of 2 m, and the bounce height of the ball was measured. This measurement was performed three times, and the average value was calculated (this average value is called a bounce value).
For basketball, the product name "JB3500" and the product number "B7C3500" manufactured by Molten Corporation were used. This basketball has a size 7 ball (diameter about 24.5 cm, weight 567 g to 650 g) with artificial leather on the surface, and an air pressure of 0.6 bar (0.06 MPa).
For each floor sheet, the ball repulsion rate was calculated by the following formula. The results are shown in Tables 1 and 2.
Ball repulsion rate (%) = (rebound value ÷ reference value) x 100.

FIG. 4 is a graph showing the relationship between the G value of the floor sheet of Examples 1 to 7 and Comparative Example 1 and the thickness of the foamed resin layer. The floor sheets of Examples 1, 2 and Comparative Example 1 have the same layer structure except that the thickness of the foamed resin layer is different. With reference to FIG. 4, it can be seen that when the thickness of the foamed resin layer is 2.9 mm or more, the G value is 100 or less.

1 Floor sheet 2 Non-foamed resin layer 22 Surface layer 23 Design layer 3 Fiber reinforced layer 4 Foamed resin layer

Claims (3)

It has a laminated structure having a non-foamed resin layer, a fiber reinforced layer containing glass fibers, and a foamed resin layer having a thickness of 2.9 mm to 5 mm in this order from the top.
A floor sheet for a sports facility having a ball repulsion rate of 90% or more and a G value of 100 or less and a thickness of 4 mm to 6 mm. The floor sheet for a sports facility according to claim 1, wherein the thickness of the non-foamed resin layer is 0.8 mm to 1.8 mm. The first or second claim, wherein the non-foamed resin layer has a surface layer and a design layer in this order from above, and the total thickness of the surface layer and the design layer is 0.5 mm to 1.8 mm. Floor sheet for sports facilities.

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