JP2003096712A - Artificial lawn filled with filler, and artificial lawn stadium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a long pile artificial lawn which can realize excellent shock absorption in spite of a low cost by devising a layer structure of elastic particulate matter and rigid particulate matter. SOLUTION: In the artificial lawn 1 filled with a filler 4, the filler 4, which contains the elastic particulate matter and the rigid particulate matter, is infilled among piles 3, which are implanted in a base fabric 2, in such a manner as to be split into at least three layers. Among three layers to the side of a lawn surface, both of upper and lower layers serve as elastic layers 41 and 42 which are predominantly composed of the elastic particulate matter; and a middle layer serves as a rigid layer 43 which is predominantly composed of the rigid particulate matter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an artificial turf in which a filler is filled between piles planted in a base cloth, and more specifically, a layer structure of elastic particles and hard particles is devised. In addition, the present invention relates to artificial turf technology that can realize high impact absorption characteristics at low cost.

[0002]

2. Description of the Related Art Pile longer than normal artificial grass (about 50
The so-called long pile artificial turf, which is planted in a base cloth (about 60 mm), has a feeling of stepping and rolling of a ball close to that of natural turf, and is becoming popular as an artificial turf for ball stadiums such as soccer and baseball. This type of artificial turf is filled with elastic granules, such as crushed tires, so-called rubber chips, between the piles to give elasticity close to that of natural turf.

This elasticity generally increases as the filling amount per unit area of the elastic granular material increases, but the unit price of the elastic granular material is high and the cost increases as the filling amount increases. Therefore, in this type of artificial turf, it is more economical to use a hard granular material such as sand, which is inexpensive, in combination.

Further, rather than filling only with elastic granules,
It is known that, by using elastic particles and hard particles in combination, it is possible to disperse and absorb the shock generated by the player's stepping in a wide range, and to obtain a shock absorbing property closer to that of natural grass.

[0005]

However, although high impact absorption can be obtained by using the elastic granular material and the hard granular material together, even if the usage amount (filling amount) per unit area is the same, for example. , Depending on how they are combined, they may have completely different impact absorption properties.

Therefore, an object of the present invention is to devise a layered structure of an elastic granular material and a hard granular material to achieve low cost,
It is to provide an economical long-pile artificial turf that can realize high impact absorption characteristics.

[0007]

In order to solve the above-mentioned problems, the present invention relates to a filler-containing artificial material in which a filler containing elastic particles and hard particles is filled between piles planted in a base cloth. In the lawn, the above-mentioned filling material is divided into at least three layers or more, and among the three layers near the surface of the lawn,
Both the upper layer and the lower layer are elastic layers having an elastic granular material as a main material, and the middle layer is a hard layer having a hard granular material as a main material.

According to this, the hard layers sandwiched by the elastic layers disperse the impact load in a wide range, and the deformation amount becomes large by the lower elastic layer, so that, for example, the amount of the filler used per unit area is increased. The shock absorption is higher than that in the case where the conventional elastic layer and the hard layer are made the same in a simple two-layer structure.

When the lower elastic layer has a smaller thickness than the upper elastic layer, the hard layer is less likely to be deformed by an impact load and the impact absorbency does not increase. Therefore, the lower elastic layer is the upper elastic layer. It is preferable to be filled so as to have a thickness equal to or more than that.

In other words, although the upper elastic layer is formed thinner than the lower elastic layer, the upper elastic layer should have at least 1/8 or more of the total thickness of the filler. As described above, it is possible to obtain a higher impact absorbing property by increasing the thickness of the lower elastic layer and alternately laminating it with the hard layers.

In order to effectively suppress the scattering of the filler, it is preferable that the pile protrusion height from the surface of the filler to the tip of the pile is 10 mm or more. further,
In order to obtain high elasticity as a long pile artificial turf,
The pile length from the surface of the base cloth to the tip of the pile is 3
It is preferably 0 to 60 mm.

The filling work of these fillers is generally carried out by alternately filling hard granules and elastic granules between the piles by using a brush, but when filling the filler of the next layer, Since a part of the filling material filled in is scraped up, the interface becomes a state in which hard particles and elastic particles are substantially mixed. The present invention allows such an aspect.

The present invention also includes various artificial grass stadiums constructed by the artificial grass containing the filler. That is,
It can be applied to various artificial grass fields such as baseball fields, soccer fields, and tennis courts. Further, even in other artificial turf facilities, the artificial turf properties obtained by the present invention may be arbitrarily selected and constructed.

As a more specific embodiment, in each of the above artificial grass stadiums, a filling material containing elastic particles and hard particles is filled between piles planted in a base cloth, and the piles are inserted from the surface of the base cloth. The pile length up to the tip is 30 to 60 mm, the filler is divided into at least three layers or more, and the upper layer and the lower layer among the three layers close to the surface of the turf are mainly composed of elastic particles. The elastic layer is made of a material, the middle layer is a hard layer mainly made of hard granular material, and the elastic layer is the thinnest layer of at least 1 of the total thickness of the filler.
Constructed from artificial turf with a filling material that is / 8 or more.

As another aspect, in each of the above-mentioned artificial grass stadiums, a filler containing elastic particles and hard particles is filled between piles planted in a base cloth, and from the surface of the base cloth to the tip of the pile. Has a pile length of 30 to 60 mm, the filler is divided into at least three layers or more, and the upper layer and the lower layer of the three layers closer to the surface of the turf are mainly composed of elastic granular material. In the elastic layer, the middle layer is a hard layer containing hard granular material as a main material, and the artificial turf with filler has a pile projection height from the surface of the filler to the tip of the pile of 10 mm or more.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, in the artificial turf 1 with a filler of the present invention, piles 3 are tufted on a base cloth 2 at predetermined intervals, and a backing material 21 for preventing the pile 3 from coming off is provided on the back surface. It is constructed by laying artificial turf 1 on a base and filling a filler 4 between the piles 3.

In this embodiment, the base fabric 2 is, for example, polypropylene (PP), polyethylene (PE), nylon (NY), polyethylene terephthalate (PET).
It may be a cloth-like material obtained by weaving a resin-made base fabric raw yarn uniaxially stretched or woven together to form short fibers.

Also, two of the base fabrics 2 may be used in a stacked manner. According to this, the stacking of two sheets is more preferable because the step stability is higher and the wrinkles are less likely to be wrinkled by an external force after being laid. When the two base fabrics 2 are stacked, the dimensional stability and the wrinkle prevention property are further improved by using a punched base fabric made of synthetic fiber cotton as the base fabric on the lower side.

The pile 3 is made of polypropylene (P
P), polyethylene (PE), nylon (NY), polyethylene terephthalate (PET) or other synthetic resin split yarn or monofilament yarn may be used, and the thickness thereof is preferably 5000 to 10000 d.
tex. The thickness when the monofilament yarn is used is the total thickness when several to several tens of single yarns of 500 to 1000 dtex are twisted to form one yarn.

In this embodiment, the pile 3 is made of polypropylene split yarn and is planted at intervals of 10 to 20 mm with respect to the base fabric. The backing material 21 for preventing the pile 3 from coming off is made of SBR.
A method of applying latex rubber, urethane resin or the like to the back surface of the base fabric 2 is used.

The artificial turf 1 of the present invention is a so-called long pile artificial turf in which the pile length H from the base cloth 2 to the pile tip is 30 to 60 mm, and the filler 4 is placed between the piles 3.
Is the pile protrusion height h from the surface of the filler 4 to the pile tip
Is 10 mm or more. According to this, scattering of the filler 4 is effectively prevented.

The filler 4 is composed of elastic layers 41 and 42 whose main material is elastic granular material and a hard layer 43 whose main material is hard granular material. The elastic layers 41 and 42 are vertically arranged by the hard layer 43. It has a three-layer structure divided into directions. As for the total thickness of the entire filler layer, the pile protrusion height h described above is 10 m.
If it is projected by m or more, it may be appropriately selected according to the specifications.

In this embodiment, the filler 4 is laminated in three layers, but the filler 4 of the present invention may be laminated in at least three layers or more. That is, for example, in the case of a four-layer structure, three layers near the surface of the turf are the subject of the present invention, and the elastic layer 41 on the upper layer side is substantially the uppermost layer. Further, another hard layer may be provided below the lower elastic layer 43, and further, this three-layer structure may be repeatedly laminated as one repeating unit.

Of the elastic layers 41 and 42, the lower elastic layer (lower elastic layer) 42 is filled so as to have the same thickness as or more than the upper elastic layer (upper elastic layer) 41. Has been done. According to this, the impact load applied to the hard layer can be dispersed over a wide range, and the hard layer can easily be uniformly deformed, so that the impact absorbability is enhanced.

In other words, among the elastic layers 41, 42, the upper elastic layer 41 is substantially the thinnest layer. Even if this elastic layer is the thinnest, the total thickness of at least the filler is at least. It is preferable to be filled so as to have a thickness of ⅛ or more.

As described above, by increasing the thickness of the lower elastic layer and alternately laminating it with the hard layers, a higher impact absorbing property can be obtained. When the thickness of the lower elastic layer is less than ⅛, the deformation of the elastic layer becomes smaller than the deformation amount of the entire filling layer, and the shock absorption becomes small, which is not preferable.

Recycled products such as waste rubber products are preferably used as the elastic granules, but in addition to these various waste rubber products, urethane or other crushed products of elastic bodies can also be used. It is preferable that 80% or more of the elastic particles have a particle size of 0.3 to 3.0 mm. That is,
If the particle size exceeds 3.0 mm, the artificial turf will not be well packed between the piles during the filling operation, and if the particle size is less than 0.3 mm, it may be scattered or flown out due to wind or rainfall.

The hard granular material may be various ceramics or stones and is not particularly limited, but silica sand, which is inexpensive and easily available, is preferable. It is preferable that 80% or more of the hard particles have a particle size of 0.2 to 0.6 mm. That is, the particle size is 0.2 m
If it is less than m, the sand of the hard layer 43 may move to the lower elastic layer 43 and be mixed with each other. Further, the particle size is 0.
If it exceeds 6 mm, it becomes difficult to insert it between the piles.

The filling operation of these fillers 4 is carried out by alternately using a hard granular material and an elastic granular material by using a brush.
A method of filling the space is generally used, but when filling the filler (for example, the hard layer 43) of the next layer, a part of the filler (for example, the elastic layer 42) previously filled is scraped up, The interface is in a state where the hard particles and the elastic particles are substantially mixed, but the present invention allows such an aspect.

The artificial grass structure of the present invention can be applied to various artificial grass fields such as baseball arenas, soccer fields, and tennis courts. Further, even in other artificial turf facilities, the artificial turf properties obtained by the present invention may be arbitrarily selected and constructed.

[0031]

EXAMPLES Next, more specific examples of the present invention will be compared and examined together with comparative examples. First, artificial turf containing a filler was produced by the following method.

(Preparation of artificial grass with filler): Preparation of artificial grass PP, PE, NY split yarn 8000 dtex
(Width 12 mm) was piled up with a pile length of 55 on a base fabric made of polypropylene plain woven fabric according to the specifications of each Example and Comparative Example
After tufting in mm, SBR latex rubber was evenly applied from the back side to prevent it from coming off, thus producing artificial turf. In each example, the pile distance (gauge) is 15 mm,
The feed amount (stitch) of the needle was 5.5 pieces / inch. : 1 m square of artificial turf produced by filling with a filler is laid on a preliminarily grounded base, and hard granules (sand) and elastic granules are provided in the contents shown in Examples 1 to 5 and Comparative Examples 1 to 3. The product (rubber chip) was stacked and filled. In any of the examples, the hard granules are made of silica sand having a particle size of 0.2 to 0.6 mm, which accounts for 85% or more of the whole, and the elastic granules have a particle size of 0.2 to 0.6 mm.
A crushed product of waste tires having a diameter of 3.0 mm accounting for 90% or more of the whole was used. Then, the artificial grass produced by the above method was subjected to the following evaluation test.

(Confirmation of Shock Absorption) The artificial turf containing the prepared filling material is placed on a concrete base and DIN180 is used.
Impact absorption was confirmed using a 32 Berlin type tester.
The test method is that the weight with a mass of 20 kg is dropped from a height of 55 mm, and the maximum impact force (weight) of the floor when it collides with the floor via a steel spring is measured. The impact response (damping) of the evaluation floor was evaluated by comparing the maximum impact force of the evaluation floor with the maximum impact force on the evaluation floor. The calculation method of the shock attenuation rate was according to the following formula 1. Impact damping rate (%) = (1− (Fc / Fs)) × 100 Equation 1 where Fc is the maximum impact force on the evaluation floor, and Fs is the maximum impact force on the rigid floor (concrete floor). Is. The evaluation results are shown below.

[0034]     << Example 1 >> [Pile material] PE (polyethylene) [Type and thickness of filling] <Surface side>                         4th layer: Rubber (10 mm)                         Third layer: sand (10 mm)                         Second layer: rubber (10 mm)                         First layer: sand (10 mm)                               <Base fabric side> [Filling Thickness] Sand: 20 mm + Rubber: 20 mm = 40 mm in total [Shock absorption rate] 46.2%

[0035]     << Example 2 >> [Pile material] PE (polyethylene) [Type and thickness of filling] <Surface side>                         4th layer: Rubber (7.5 mm)                         Third layer: sand (10 mm)                         Second layer: rubber (12.5 mm)                         First layer: sand (10 mm)                               <Base fabric side> [Filling Thickness] Sand: 20 mm + Rubber: 20 mm = 40 mm in total [Shock absorption rate] 47.3%

[0036]     << Example 3 >> [Pile material] PE (polyethylene) [Type and thickness of filling] <Surface side>                         4th layer: Rubber (7.5 mm)                         Third layer: sand (7.5 mm)                         Second layer: rubber (12.5 mm)                         First layer: sand (12.5 mm)                               <Base fabric side> [Filling Thickness] Sand: 20 mm + Rubber: 20 mm = 40 mm in total [Shock absorption rate] 48.8%

[0037]     << Example 4 >> [Pile material] NY (nylon) [Type and thickness of filling] <Surface side>                         4th layer: Rubber (10 mm)                         Third layer: sand (10 mm)                         Second layer: rubber (10 mm)                         First layer: sand (10 mm)                               <Base fabric side> [Filling Thickness] Sand: 20 mm + Rubber: 20 mm = 40 mm in total [Shock absorption rate] 46.6%

[0038]     << Example 5 >> [Pile material] PE (polyethylene) [Type and thickness of filling] <Surface side>                         4th layer: Rubber (10 mm)                         Third layer: sand (10 mm)                         Second layer: rubber (10 mm)                         First layer: sand (10 mm)                               <Base fabric side> [Filling Thickness] Sand: 20 mm + Rubber: 20 mm = 40 mm in total [Shock absorption rate] 45.4%

[0039]     <Comparative Example 1> [Pile material] PE (polyethylene) [Type and thickness of filling] <Surface side>                         4th layer: None                         Third layer: None                         Second layer: rubber (20 mm)                         First layer: sand (20 mm)                               <Base fabric side> [Filling Thickness] Sand: 20 mm + Rubber: 20 mm = 40 mm in total [Shock absorption rate] 40.9%

[0040]     <Comparative example 2> [Pile material] PE (polyethylene) [Type and thickness of filling] <Surface side>                         4th layer: Rubber (12.5 mm)                         Third layer: sand (10 mm)                         Second layer: rubber (7.5 mm)                         First layer: sand (10 mm)                               <Base fabric side> [Filling Thickness] Sand: 20 mm + Rubber: 20 mm = 40 mm in total [Shock absorption rate] 41.6%

[0041]     <Comparative Example 3> [Pile material] PE (polyethylene) [Type and thickness of filling] <Surface side>                         4th layer: Rubber (4 mm)                         Third layer: sand (10 mm)                         Second layer: rubber (16 mm)                         First layer: sand (10 mm)                               <Base fabric side> [Filling Thickness] Sand: 20 mm + Rubber: 20 mm = 40 mm in total [Shock absorption rate] 41.0%

For reference, the above Examples 1 to 5 and Comparative Example 1
Table 1 shows a summary of the results of ~ 3.

[0043]

[Table 1]

The following findings were obtained from the results of the above Examples and Comparative Examples. -In Example 1, although the total thickness of the filler layer is the same as that of Comparative Example 1, the impact absorbing property is improved by having the four-layer structure of the rubber layer and the sand layer. In Comparative Example 2, the rubber layer and the sand layer have a four-layer structure, but since the lower rubber layer is thin, the impact absorption rate is lower than that in Example 1. In Comparative Example 3, the lower rubber layer is thicker, but since the thickness of the upper rubber layer is ⅛ or less of the total thickness (40 mm), the impact absorption rate is higher than that of Example 1. Low. -In Example 3, the first sand layer and the third sand layer are the same as in Example 1, but the second rubber layer is thicker than the fourth rubber layer, and thus shock absorption is greater than in Example 1. The rate is slightly higher. -In Example 4, the second rubber layer and the fourth rubber layer are the same as those in Example 3, but the third sand layer is thicker than the first layer, and therefore shock absorption is greater than in Example 3. The rate is slightly higher. When comparing the shock absorption rates of Examples 1, 5 and 6,
Although there is no great difference between Example 1 and Example 5, Example 6
Is slightly lower. This is because the pile made of PP is PE, N
It is considered that this is because the filler is more easily tightened as compared with the product made from Y.

[0045]

As described above, according to the present invention,
In a filled artificial turf in which a filler containing elastic particles and hard particles is filled between piles planted in a base cloth, the filler is divided into at least three layers or more, and the turf surface Of the three layers on the side, the upper layer and the lower layer are both elastic layers having an elastic granular material as a main material, and the middle layer is a hard layer having a hard granular material as a main material. The impact load applied to is evenly distributed over a wide range, so that the impact absorption rate increases.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of an artificial turf containing a filler according to an embodiment of the present invention.

[Explanation of symbols]

1 Artificial grass with filler 2 base cloth 21 Backing material 3 piles 4 Filling material 41,42 elastic layer 43 Hard layer 44 mixed layer

Claims (8)

[Claims] 1. A filled artificial turf in which a filler containing elastic particles and hard particles is filled between piles planted in a base cloth, wherein the filler is divided into at least three layers and filled. The upper layer and the lower layer of the three layers closer to the surface side of the turf are both elastic layers mainly made of elastic particles, and the middle layer is a hard layer mainly made of hard particles. Artificial grass with filler. 2. The filled artificial turf according to claim 1, wherein the lower elastic layer is filled so as to have a thickness equal to or greater than that of the upper elastic layer. 3. The artificial turf with a filler according to claim 1, wherein each of the elastic layers has a thickness of at least ⅛ or more of the total thickness of the filler even if it is the thinnest layer. 4. The artificial turf with a filler according to claim 1, wherein the height of protrusion of the pile from the surface of the filler to the tip of the pile is 10 mm or more. 5. The filled artificial turf according to claim 1, wherein the pile length from the surface of the base cloth to the tip of the pile is 30 to 60 mm. 6. An artificial turf stadium constructed by the artificial turf containing the filler according to claim 1 or 2. 7. A filling material containing elastic particles and hard particles is filled between the piles planted in the base cloth, and the pile length from the surface of the base cloth to the tip of the pile is 30 to 60 m.
The above-mentioned filler is divided into at least three layers or more, and among the three layers near the surface of the lawn, the upper layer and the lower layer are elastic layers whose main material is elastic granular material, and the middle layer is hard granular. The elastic layer is the thinnest layer and is at least 1 / th of the total thickness of the filler.
An artificial turf stadium characterized by being constructed from a filled artificial turf having a thickness of 8 or more. 8. A filling material containing elastic particles and hard particles is filled between the piles planted in the base cloth, and the pile length from the surface of the base cloth to the tip of the pile is 30 to 60 mm. The filler is divided into at least three layers or more, and among the three layers near the surface of the lawn, the upper layer and the lower layer are elastic layers having elastic granular material as a main material, and the middle layer has hard granular material as a main material. An artificial turf stadium constructed of an artificial turf containing a filling material, which is a hard layer that has a height of 10 mm or more from the surface of the filling material to the tip of the pile.