JP2000290916A - Artificial lawn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To bond and fix artificial lawns on a base material with an adhesive, and without damaging permeable property formed on the base material. SOLUTION: When artificial lawn threads 2 are fixed on a base material 3 having permeability for implanting the artificial lawn threads 2 by applying an adhesive 4, a granular adhesive (powdered adhesives) 4a is used as the adhesive 4, the proper quantity of the adhesive is scattered on a rear face of the base material 3 to heatedly melt. Accordingly, the artificial lawn threads 2 are bonded and fixed on the base material without damaging permeability of the base material 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an artificial turf for use in a sports facility or the like, and more particularly, to an artificial turf having a water permeability that does not require a special post-processing for imparting the water permeability. .

[0002]

2. Description of the Related Art Artificial turf used in competition facilities such as tennis courts is formed by planting (taft) artificial turf yarn (pile) at a predetermined pitch on a base material made of, for example, a textile base fabric. An adhesive material called a backing material is applied to the back side of the base material to fix the planting portion of the artificial turf yarn.

Conventionally, rubber-based latex has been used as a backing material. That is, a rubber-based latex is applied in a liquid weight of about 1000 g per square meter, and is dried and vulcanized to form a backing material in a layer on the back surface side of the substrate.

[0004] Incidentally, in order to prevent puddles from being generated during rainfall or watering, artificial turf for outdoor facilities is required to have good water permeability as one of its characteristics. The fibrous base fabric itself has water permeability because there are gaps in its weave. Moreover, even in the case of a nonwoven fabric, there is water permeability.

[0005] Even when a non-water permeable synthetic resin sheet is used as the base material, since the tuft holes are opened with the planting of the artificial turf yarn, the water permeability is provided by this. As described above, although the base material has water permeability, the formation of the backing layer after that makes the whole non-water permeable.

[0006]

Therefore, conventionally, after the backing layer is formed, the water permeation process is performed. For example, a heating roll having a large number of needles or a so-called soldering iron having a sharp tip is used to make a hole from the back surface of the artificial grass to the base material through the backing layer.

However, according to this, a dedicated machine for perforating holes such as a heating roll and a soldering iron is required,
Since the number of man-hours increases by that amount, cost increase is inevitable. Further, in order to obtain uniform water permeability over the entire surface of the artificial turf, it is necessary to perform a certain fine hole drilling operation. In addition, since a water-permeable hole is formed in the substrate, the strength of the substrate itself is reduced.

[0008]

DISCLOSURE OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to use an adhesive with an adhesive without impairing the water permeability of a substrate. An object of the present invention is to provide an artificial lawn in which lawn yarn can be bonded and fixed to a base material.

In order to achieve the above object, the present invention provides a water-permeable base material on which artificial turf yarn is planted, and the planting portion of the artificial turf yarn is fixed on the back side of the base material with an adhesive. In the artificial turf described above, the adhesive was sprayed as granules (including powder) on the back side of the base material in an amount of 10 to 1000 g per square meter, and was heat-sealed to the base material. It is characterized by consisting of things.

The substrate used in the present invention is, in addition to a fibrous base fabric (woven fabric, non-woven fabric) itself having water permeability, a substrate provided with water permeability by post-processing, for example, a synthetic resin sheet. Thus, a sheet substrate in which tuft holes are formed in accordance with planting of artificial grass yarn may be used.

[0011] In short, the substrate only needs to have water permeability before the application of the adhesive. In the present invention, whether or not artificial grass (finished product) has water permeability is determined by J
In a water permeability test based on IS-A1218, a water permeability coefficient of 1.5 × 10 ⁻³ (cm / sec) or more is defined as “permeable”.

That is, the hydraulic conductivity is 1.5 × 10
^{If it is -3} (cm / sec) or more, even if it rains about 5 mm per hour, water is easily drawn, and the artificial grass is said to have water permeability. In the present invention, the water permeability of the artificial turf is exclusively dependent on the water permeability of the substrate, and therefore, the water permeability of the substrate is preferably larger than the water permeability of the artificial turf as a whole.

According to the present invention, the adhesive as the backing material is dispersed in a granular form on the back side of the substrate on which the artificial turf is planted, and is fused to the substrate by heating to fix the artificial turf. The spraying amount (adhesion amount) is in the range of 10 to 1000 g per square meter. Preferably, the weight is 600 g or less per square meter.

That is, by setting the spraying amount to 1000 g / m ² or less, the water permeability of the base material is not hindered, so that it is not necessary to form a hole for obtaining the water permeability thereafter. can do. In addition, since the amount of application is 10 g / m ² or more, more uniform application of the adhesive powder can be easily performed, and the fixing strength of the artificial turf yarn can be secured.

The adhesive may be a polymer which loses thermoplasticity after bonding and fixing, such as a cross-linked resin.
In the present invention, it is preferable that the artificial turf yarn is made of a polymer having thermoplasticity even after being adhered and fixed,
According to this, the entire artificial turf is made of a thermoplastic resin in a unified manner, so that the artificial turf collected for re-placing can be recycled, for example, by a composite regeneration method.

Polymers having thermoplasticity even after this type of adhesive fixing include olefinic thermoplastic resins,
Typical examples include polypropylene and polyethylene, and among them, isotactic polymers, atactic polymers, and ethylene-containing copolymers are more preferable.

According to a preferred embodiment of the present invention, organic and / or inorganic particles having an adhesive property to the adhesive are mixed into the adhesive made of the polymer. According to this, since the individual particles that are easily adhered are included so as to be wrapped in the adhesive, the strength as the backing material is increased.

Further, when the ends of the artificial grass are connected by a joint tape or an adhesive layer directly applied on the base, the particles exposed on the surface of the adhesive material may bite into the base-side adhesive layer, Depending on the material of the body, it strongly adheres to the base-side adhesive layer, so that the joining force between the ends of the artificial grass is also increased.

The easy-adhesion (affinity, adhesion) of the particles mixed into the adhesive may be based on the material itself, or the particles may be easily adhered to by the shape effect. You may make it give. In any case, since the granules have an easy-to-adhere property, the adhesive strength can be increased with a small amount of the granules, and the thermoplasticity of the adhesive is maintained, so that the recyclability is not impaired.

In particular, when the easy-adhesion of the granules is determined by the shape effect, it can be said that the polishing powder generated in the polishing step is optimal. That is, since the abrasive powder has a remarkably large surface area as compared with a powder having the same weight, the abrasive powder is extremely excellent in easy adhesion to the adhesive, and the amount of the abrasive powder to the adhesive can be relatively reduced. Moreover, this type of abrasive powder has no particular use and is discarded as it is, so that it can be obtained at low cost.

Various rubbers, urethanes, and various thermoplastic elastomers can be exemplified as the easily adhered particles which are familiar with the adhesive, and urethane, natural rubber, styrene-butadiene rubber, etc. are particularly versatile. High and preferably employed.

Further, a thermoplastic resin may be used. For example, a polyethylene or a polypropylene having a high melting point as easy-adhesive particles may be used as an adhesive, and both powders may be heated to form a backing material. As the inorganic granules, soil such as clay, sand and the like can be used in addition to calcium carbonate and aluminum oxide.

From the viewpoint of the adhesiveness between the adhesive and the particles,
It is preferable that the particles have a small particle size (for example, 1 mm or less) and a large surface area (for example, a particle having a scratched surface such as abrasive powder).

Thus, the particle size of the granules is preferably 1 m
m or less. If priority is given to the adhesiveness to the underlying adhesive layer such as a joint tape, among them, the larger the particle size of the granules is preferable. For example, it is preferably 1 μm or more, more preferably 80 μm or more, and further preferably 4 μm or more.
If it is 0 mesh / 300 μm or more, a sufficient adhesive effect is recognized. Also in this case, it is preferable that the surface shape is large as described above.

On the other hand, from the viewpoint of recyclability, it is preferable that the particle size of the granules is small (100 μm or less). In particular, it is 20 μm or less, more preferably 5 μm.
m or less. That is, if the particle size of the granules is large, the granules remain as foreign matter in the adhesive, and the thermoplasticity of the adhesive may be impaired. On the other hand, when the particle size of the granules is small, the granules are dispersed as a so-called filler (aggregate) in the adhesive, so that the adhesive remains thermoplastic.

Generally speaking, in order to increase the adhesive strength, it is preferable that the particle size of the particles is 1 μm or more and 1 mm or less, and that the range of 1 to 100 μm is preferable in terms of recyclability. In terms of recyclability, the mixing ratio between the adhesive and the granules is expressed by weight ratio, adhesive: granules = 99: 1 to 20: 8.
It is preferably within the range of 0.

The substrate used in the present invention is preferably a plain-woven base fabric using, for example, a thread such as polypropylene or polyester, which itself has water permeability. In other words, the plain woven base fabric is made of a simple braid of warp and weft, and the voids are regularly present in a two-dimensional matrix in the weave, so that the resin powder of the adhesive is easily dispersed uniformly, A relatively large void is left after the resin is melted. Therefore, it is possible to obtain a wide and long artificial grass having uniform water permeability over the entire surface.

The artificial turf of the present invention is preferably laid on a water-permeable base layer such as water-permeable asphalt. Further, it may be constructed as a so-called sand-containing artificial turf in which the grass is filled with granular materials such as sand and rubber chips.

[0029]

BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described in more detail with reference to an embodiment shown in the drawings.

In the sectional view of FIG. 1, an artificial lawn 1 according to an embodiment of the present invention is shown as a so-called artificial lawn containing sand. According to this, this artificial lawn 1 is composed of a large number of artificial grass yarns 2
Is provided.

The artificial grass yarn 2 is made of an olefin resin fiber,
Among them, polypropylene fibers are particularly preferable, but other resin fibers may be used. The planting portion of the artificial turf yarn 2 is fixed by an adhesive (backing material) 4 on the back surface side of the base material 3.

In the present invention, a substrate 3 having water permeability before applying the adhesive 4 is used. Therefore, a fibrous base fabric such as a woven fabric or a nonwoven fabric having water permeability in itself is preferably used, but in addition to the above, water permeability is given by post-processing, such as a synthetic resin sheet. In addition, a sheet substrate in which tuft holes are formed with the planting of the artificial turf yarn 2 can also be used. It should be noted that even in a fibrous base cloth having water permeability, the tuft holes are formed by planting the artificial turf yarn 2, so that the water permeability becomes larger.

In this embodiment, a plain woven base fabric is used for the base material 3, and FIG. 2 (a) is a partially enlarged plan view of the plain woven base cloth, and FIG. FIG. 3 is a sectional view taken along line AA. This plain weave base fabric is made by weaving warp yarns 3a and weft yarns 3b made of plain yarns such as polyester or polypropylene in a zigzag shape. are doing. When viewed microscopically, the gap G
Is a step as shown in FIG. 2 (b).

A large number of artificial turf yarns 2 are planted at a predetermined pitch on the base material 3 made of the plain-woven base fabric, and the planted portion (root portion) is fixed by the adhesive 4 on the back side of the base material 3. According to the present invention, however, the adhesive 4 is dispersed in powder form on the back side of the substrate 3 and is melted by heating.
To be fused.

FIG. 3A shows a state in which the powder resin 4a of the adhesive 4 is sprayed on the back side (the upper side in FIG. 3) of the base material 3 on which the artificial grass yarn 2 is planted. I have. Note that the powder resin includes a granular resin, and therefore, in the present specification, the powder resin 4a is defined as a powder or a granular adhesive.

Here, what is important is the amount of powder resin 4a to be sprayed. That is, the amount of spraying should not impair (lost) the water permeability of the base material 3 when heat-sealing. On the other hand, it must be strong enough to fix the artificial turf yarn 2.

Therefore, in the present invention, the amount of the powder resin 4a of the adhesive 4 to be sprayed is in the range of 10 to 1000 g / m ² . A preferable numerical value is specifically 600 g / m ² . That is, the application amount of the powder resin 4a is 1000 g / m
^When it is ² or less, the water permeability of the base material 3 is not hindered, and therefore, it is not necessary to perform a hole forming process for obtaining water permeability thereafter.

In particular, when the content is 600 g / m ² or less, sufficient water permeability can be obtained even when a filler such as sand is used between artificial grasses. On the other hand, the application amount is 10 g / m
^Since it is ² or more, the powder resin 4a can be evenly dispersed, and the fixing strength required for fixing the artificial turf yarn 2 to the base material 3 is secured.

In this embodiment, since the base material 3 is made of a plain woven base cloth, the powder resin 4a sprayed on the back side thereof is moved by vibrations when being conveyed to the next heating and melting step, for example, and is partially moved. There is no risk of bias.

That is, in the case of the plain woven base fabric, as described above, since each woven portion has a step, this limits the moving range of the powder resin 4a. In this sense, a so-called powdery resin having a particle size that is caught by the step, that is, 1 mm or less, and more preferably 500 μm or less is preferably selected.

FIG. 3 (b) schematically shows a state in which the powder resin 4a is heated and melted, and the adhesive 4 is attached to the back surface of the base material 3. As can be seen from the figure, according to the present invention, since the adhesive 4 is made of a heat-melted powder resin, it does not cover the entire back surface of the base material 3 as a layer, and the applied portion is partially stopped. .

Therefore, even if the gap G and the tuft hole of the weave portion contributing to the water permeability are partially closed by the adhesive material 4, most of the gap G and the tuft hole are still left. It will not be lost. In addition, since the powder resin 4a is uniformly dispersed, the water permeability of the artificial turf 1 is also made uniform as a whole.

The adhesive 4 to be used may be a cross-linkable resin such as urethane. However, if it is intended to obtain recyclability, the adhesive 4 may be heated even after the artificial grass yarn 2 is bonded and fixed. It is preferable to be made of a polymer having plasticity. In addition, as the polymer having thermoplasticity even after the adhesion and fixing, olefin-based thermoplastic resins, typically polypropylene and polyethylene, are exemplified. Among them, isotactic polymers, atactic polymers, and ethylene-containing polymers are included. And the like are more preferably exemplified.

When the above-mentioned polymer is used as the adhesive 4, as shown in FIG. 4, the adhesive 4 may include particles 5. As long as the particles 5 have an easy-to-adhere property (affinity) to the polymer and an adhesive layer of a joint tape (not shown),
The material may be either organic or inorganic.

If the material is required to be easily adhered to the granules 5, various kinds of rubbers, urethanes, thermoplastic elastomers and the like are exemplified in the case of an organic material. In particular, urethane, natural rubber and styrene-butadiene rubber Is preferred. As inorganic particles, calcium carbonate and aluminum oxide,
Soil such as clay and sand can also be used.

If the easy-adhesion of the granules 5 is required for the shape, it is preferable that the granules 5 have a large contact area with the adhesive and have good so-called "galling". For example, polishing powder generated by the polishing process is optimal.

The particle size r of the particles 5 is 1 in view of increasing the strength of the adhesive 4 itself.
mm or less. More preferably, the surface area should be large like abrasive powder.

The granules 5 are uniformly mixed in the adhesive 4 so that, as shown in FIG. 4, some of the granules 5 are also exposed on the surface of the adhesive 4a. This will increase the adhesive strength with the joint tape. That is, when the joint tape is attached to the back surface of the artificial grass 1, the granules 5 bite into the adhesive layer of the joint tape and serve as a so-called anchor, so that the artificial grass 1 and the joint tape are more firmly joined. .

From the viewpoint of exhibiting the anchor effect of the granules 5 more, when the particle size r of the granules 5 is 1 mm or less, the larger the particle size r, the better.
It is good to be more than μm. For example, 40 mesh / 300
When the thickness is at least μm, sufficient bonding strength with the joint tape can be obtained.

On the other hand, in order to maintain the recyclability of the adhesive 4, it is preferable that the particle size r of the granules 5 is small.
Specifically, the thickness is 100 μm or less, preferably 20 μm or less, and more preferably 5 μm or less. In short, the particle size r of the granules 5 is preferably 1 μm ≦ r ≦ 1 mm in order to increase the adhesive strength, while the particle size r is 1 μm ≦ r ≦ 100 μm in order to maintain the recyclability. It means that the range is good.

The artificial turf 1 can be obtained as follows. One example will be described with reference to FIG. 5. The base material 3 on which the artificial grass yarn 2 is implanted is arranged in a direction indicated by an arrow A (see FIG.
At the right). A hopper 6 is provided on this transport path. Further, a heater 7 composed of, for example, an infrared heater is provided downstream of the hopper 6 in the transport direction.

In this production example, a resin powder 4a of an adhesive (the above-mentioned polymer) 4 and an organic or inorganic particle 5 are mixed and put in a hopper 6, and the substrate 3 is conveyed. With this, an appropriate amount is sprayed from the hopper 6 on the back side of the base material 3. Then, by being heated by the heater 7, the adhesive 4 containing the particles 5 is adhered to the back surface side of the base material 3, and the artificial grass thread 2 is fixed.

Incidentally, two hoppers may be prepared, and the powder resin 4a of the adhesive 4 may be sprayed from one of the hoppers, and the granules 5 may be sprayed from the other hopper. However, when the granules 5 are not mixed with the adhesive material 4, only one hopper may be used. In any case, the powder resin 4a may be preheated within a range not fluidized in the hopper.

When constructing a tennis court surface or the like, the artificial grass 1 is laid on a base (not shown), and adjacent ends thereof are connected to each other via a joint tape. After joining with joint tape,
Grass sand S is filled in the grass of the artificial grass 1 as needed.

In the artificial turf 1 according to the present invention, since the water permeability of the base material 3 is not impaired by the adhesive 4 as a backing material, a hole is formed by a conventional heating roller with a needle or a bar-shaped soldering iron as in the prior art. You do not need to do it.

As a criterion for judging the presence or absence of water permeability of the artificial grass, in the present invention, JIS-A which is a soil water permeability test method is used.
In a water permeability test based on 1218, the water permeability coefficient is 1.5 × 1
0 ^- and ³ (cm / sec) or more of what was that "there is water-permeable".

Here, the test apparatus 10 will be described with reference to the schematic diagram of FIG. The test apparatus 10 includes a gutter-shaped outer water tank 11 and an inner water tank 1 having upper and lower surfaces opened.
2 is provided. A drain port 11a is provided at a predetermined height on the side wall of the outer water tank 11, and the inner water tank 1
The overflow port 12a for keeping the water level constant at the upper part of the side wall of 2
Is provided.

The inner water tank 12 is placed on a support 13 in the outer water tank 11 with the test material D stretched on its lower surface. The support 13 has a perforated bottom plate 13a and a side plate 13b formed around the perforated bottom plate 13a. The inner water tank 12 is provided with a support plate 13a such that water in the inner tank leaks into the outer water tank 11 only through the test material D. Set on top.

At the time of the test, the inner water tank 12 is set on the support 13 in a state where water is stored, for example, in the outer water tank 11 up to a level near the water outlet 11a. Then, water is continuously supplied into the inner water tank 12 so that excess water overflows from the overflow port 12a.
2. Keep the water level in 2 constant.

As a result, a constant water pressure is always applied to the test material D, and the outer water tank 1 has an amount corresponding to the amount of water transmitted through the test material D.
The water volume of 1 will increase, and the same amount of water will drain 11
drained from a. By measuring the drainage amount in a predetermined time unit, the water permeability of the test material D is obtained. The formula for calculating the permeability k is as follows.

K = L / h × [Q / {A × (t1−t2)}] In the formula, L is the thickness of the test material D, h is the head difference, A is the permeable area, Q is the permeable amount, and t1 -T2 is the water permeation time.

[0062]

EXAMPLES Next, examples which were actually carried out according to the present invention and comparative examples will be described. In each example, an artificial grass yarn (pile yarn) was formed using 8000d polypropylene tape yarn, and The planting density on the timber is 5/16
The gauge was 4.5 stitches.

Regarding the presence / absence of water permeability, the water permeability coefficient of each artificial turf as the test material D was measured by the test apparatus described above with reference to FIG. Each artificial grass has a thickness L (turf length) of 1.9 cm, a head difference h of 5.0 cm, and a water permeability area A.
Was 456.75 cm ² , and the water permeation time was about 30 seconds.

Regarding the tensile (pulling) strength of the pile yarn, after fixing with an adhesive, a pulling force of 100 mm / min was applied to observe the presence / absence of detachment. Evaluation of recyclability (presence / absence of thermoplasticity) was performed by evaluating the entire artificial turf with a particle size of 5 using a crusher.
It was crushed to about mm and put into an oven at 180 ° C., and its molten state was observed.

Example 1 A nonwoven fabric made of nylon was used as a substrate. An artificial turf yarn was planted on the substrate under the above-described planting conditions, and 950 g of powdered polyethylene having an average particle size of about 300 μm was sprayed as a resin powder of an adhesive on the back surface side of the substrate, and 950 g per square meter was sprinkled and heated and fused. I let it. The water permeability coefficient k of this artificial lawn is 1.6 × 10 ⁻³ (cm / sec),
Normal levels of water permeability were obtained. The tensile strength of the pile yarn was good and the recyclability was very good.

Example 2 A plain weave base fabric made of polypropylene was used as a base material. An artificial turf yarn was planted on the substrate under the above-described planting conditions, and powdered polyethylene having an average particle size of about 300 μm was powdered on the back surface of the substrate as a resin powder of an adhesive.
950 g was sprayed per square meter and heated and fused. The water permeability coefficient k of this artificial lawn is 3.0 × 10 ⁻³ (cm / sec).
c), and higher water permeability than that of Example 1 was obtained. Further, similarly to Example 1, the tensile strength of the pile yarn was good,
The cyclability was very good.

Example 3 A plain weave base fabric made of polypropylene was used as a substrate in the same manner as in Example 2. An artificial turf yarn is planted on the substrate under the above-described planting conditions, and 590 g of powdered polyethylene having an average particle size of about 300 μm is scattered as a resin powder of an adhesive on a back side of the substrate, and 590 g per square meter is spread and heated and fused. I let it. In Example 3, omni-sand N manufactured by Sumitomo Rubber Industries, Ltd. was used as the sand in the grass to a thickness of 18 mm.
Into an artificial lawn containing sand. The water permeability coefficient k of this artificial turf was 3.1 × 10 ⁻³ (cm / sec), and excellent water permeability was obtained even when eye sand was added as a filler. Also, as in Example 1, the tensile strength of the pile yarn was good,
The recyclability was very good.

Example 4 A plain weave base fabric made of polypropylene was used as a base material. An artificial turf yarn is planted on the substrate under the above-described planting conditions, and a powdered polyethylene resin having an average particle size of about 300 μm is formed on the back surface of the substrate as a resin powder of an adhesive.
Urethane polishing powder having an average particle size of about 300 μm
At 0:15, the mixture was sprayed at 338 g per 1 m 2 and heated and fused. The permeability k of this artificial lawn is 1.
0 × 10 ⁻¹ (cm / sec), which was higher than the normal level. Both the tensile strength and recyclability of the pile yarn were good.

Example 5 A plain weave base fabric made of polypropylene was used as a base material. An artificial turf yarn is planted on the substrate under the above-described planting conditions, and a powdered polyethylene resin having an average particle size of about 300 μm is formed on the back surface of the substrate as a resin powder of an adhesive.
A clay having an average particle size of about 300 μm is prepared by weight ratio of 100: 20.
417 g per 1 m 2 was sprayed and heat-sealed. In Example 5, omni-sand N manufactured by Sumitomo Rubber Industries, Ltd. was used as mesh sand in the grass to a thickness of 18 mm.
Into an artificial lawn containing sand. The water permeability coefficient k of this artificial turf was 1.3 × 10 ⁻² (cm / sec), which was higher than the normal level. Further, the tensile strength and recyclability of the pile yarn were both good.

Comparative Example 1 A plain weave base fabric made of polypropylene was used as a base material. After the artificial turf yarn was planted on the substrate under the above-described planting conditions, polyethylene was melted on the back side of the substrate, and then heat-laminated uniformly at 400 g per square cm. The water permeability coefficient k of this artificial grass is 1.0 × 1
0 ^-4 (cm / sec), and the water permeability was clearly insufficient. In addition, the tensile strength and recyclability of the pile yarn were both good.

Comparative Example 2 A plain weave base fabric made of polypropylene was used as a base material. After the artificial grass yarn was planted on the substrate under the above-described planting conditions, 9 g of powdered polyethylene having an average particle size of about 300 μm was sprayed on the back side of the substrate as a resin powder of an adhesive material per square meter and heated and melted. I wore it. The water permeability coefficient k of this artificial grass is 1.5 × 10 ⁻¹ (cm / sec)
Although good in c), the pile yarn could not be firmly fixed due to the small amount of the adhesive used (the amount of powdered resin sprayed), and some yarn pull-out was observed in the pile yarn tensile strength test. The recyclability was good.

Comparative Example 3 A plain woven base fabric made of polypropylene was used as a base material. After the artificial grass yarn was planted on the substrate under the above-described planting conditions, 1080 g of powdered polyethylene having an average particle size of about 300 μm was sprayed as a powdery resin for the adhesive on the back side of the substrate, and 1080 g per square meter was spread. I wore it.
Because of the large amount of the adhesive used (the amount of powder resin sprayed), the water permeability coefficient k of this artificial turf was 1.0 × 10 ⁻³ (cm / sec).
It was determined that the water permeability was insufficient in c). In addition, the tensile strength and recyclability of the pile yarn were both good.

<Reference Example Regarding Water Permeability> After artificial grass yarn was planted on a polypropylene plain weave base fabric as a base material under the above planting conditions, SBR / NR latex was applied on the back side of the base material at a rate of about 1 m 2. A backing layer having a uniform thickness was formed by applying a solid coat of 1000 g. Then, in order to impart water permeability, as a post-process, a water-permeable hole having a diameter of 5 mm is opened at an interval of 7 cm in both the vertical and horizontal directions with a heating rod, and then an omni sand N manufactured by Sumitomo Rubber Industries, Ltd. Sand was filled to a thickness of 18 mm to obtain an artificial grass containing sand. In an artificial lawn made by this kind of post-processing, about 0.5 × 10 ⁻² to
A water permeability of 2.0 × 10 ⁻² (cm / sec) is obtained. In addition, in this reference example, although the tensile strength of the pile yarn is extremely good, there is no recyclability.

In summary, the specifications and evaluations of the above Examples 1 to 5, Comparative Examples 1 to 3 and Reference Examples are shown in the following table.

[0075]

[Table 1]

According to the present invention, as in Examples 1 to 5,
An adhesive for fixing the artificial turf yarn to the base material is powdered, and an appropriate amount thereof is spread on the back surface of the base material and heated and fused to obtain a water-permeable material required for artificial turf, namely, 1
Even if there is a rainfall of about 5 mm per hour, an artificial lawn having a water permeability of 1.5 × 10 ⁻³ (cm / sec) or more that easily draws water can be obtained. Therefore, post-processing for imparting water permeability becomes unnecessary.

In the case where the water-permeable hole is formed by post-processing described as a reference example, the water-permeability is certainly high, but water is drained only from the water-permeable hole, which tends to cause partial drainage. According to this, uniform water permeability can be obtained for the entire artificial grass.

[0078]

As described above, according to the present invention,
When fixing the artificial turf by applying an adhesive to the water-permeable substrate on which the artificial turf is planted, the adhesive is granulated (powder), and an appropriate amount of the adhesive is sprayed on the back of the substrate and heated. Fused, without impairing the water permeability of the substrate,
By adhering and fixing artificial turf yarn to the base material,
In particular, a predetermined water permeability required for artificial grass used outdoors can be obtained.

Accordingly, after the artificial turf yarn is adhered and fixed, it is not necessary to perform a post-processing in which a water-permeable hole is particularly formed, so that the manufacturing process is simplified and the cost can be reduced accordingly. Further, since no water-permeable hole is formed in the base material, the strength of the base material is not reduced.

Furthermore, by using a polymer having thermoplasticity even after the artificial lawn yarn is adhered and fixed as the adhesive, the artificial lawn collected at the time of re-placing can be recycled, for example, by a composite regeneration method. Also,
By mixing easy-to-adhere organic and / or inorganic particles into the polymer, the bonding strength with the underlying adhesive layer such as a joint tape can be increased.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an artificial lawn according to an embodiment of the present invention.

FIG. 2 is an enlarged plan view of a plain weave base fabric used as a base material in the above embodiment and a cross-sectional view taken along line AA of FIG.

FIG. 3 is a cross-sectional view showing a state where powder resin of an adhesive is sprayed on the plain woven base cloth and a state where the powder resin is heated and melted, respectively.

FIG. 4 is a sectional view similar to FIG. 1, showing another embodiment of the present invention.

FIG. 5 is a schematic view showing an example of a manufacturing apparatus for obtaining an artificial lawn according to the present invention.

FIG. 6 is a schematic view showing a test device for performing a water permeability test on artificial grass.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Artificial grass 2 Artificial grass 3 Substrate 3a Warp 3b Weft 4 Adhesive 4a Adhesive powder (granular) resin 5 Granules 6 Hopper 7 Heater

Claims (6)

[Claims] 1. An artificial turf comprising a water-permeable base material on which artificial turf yarn is planted, wherein the planting portion of the artificial turf yarn is fixed with an adhesive on the back side of the base material. The material is sprayed on the back side of the substrate as granules in an amount of 10 to 1000 g per square meter,
An artificial turf characterized by being heat-sealed to the substrate. 2. The artificial turf according to claim 1, wherein the adhesive is made of a polymer having thermoplasticity even after the artificial turf yarn is bonded and fixed. 3. The artificial turf according to claim 1, wherein organic and / or inorganic particles that easily adhere to the adhesive are mixed in the adhesive. . 4. The artificial turf according to claim 1, wherein the base material is a sheet having water permeability. 5. The artificial turf according to claim 4, wherein the sheet-like substrate is a plain-woven base cloth. 6. The artificial lawn according to claim 1, wherein the artificial lawn is laid on a base layer having water permeability.