JP2008095416A - Artificial turf containing filling material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an artificial turf which has an excellent crime prevention property as it emits a comparatively loud sound when somebody steps on it. <P>SOLUTION: The artificial turf containing a filling material comprises the artificial turf in which pile is implanted in a base cloth, and a hard filling material filling the gap of the pile. When the sound volume measured by a specific method when no stepping pressure is applied is 60 dB or less, the difference between this sound volume and the sound volume measured by a specific method when a stepping pressure is applied is 8 dB or above. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an artificial turf formed by filling a filler between piles planted on a base fabric.

Areas near the entrances and bathrooms on the premises of buildings such as houses and areas near the changing rooms and toilets on the premises of schools and public facilities are not easily noticeable, so it is difficult to notice even if there are intruders on the premises.
In order to solve these problems, measures such as installing a crime prevention alarm to inform intruders and contracting with a security company can be considered, but they are expensive and damage the natural landscape.

Moreover, since many of the above areas face the north side, it is difficult for sunlight to hit and plants are difficult to grow.
Therefore, for example, even if natural turf is stretched for the purpose of improving the landscape, the growth is poor, and maintenance work and costs are also required.

  Therefore, it is conceivable to install artificial grass in the above area instead of natural grass. By using artificial grass, it is possible to maintain an excellent landscape even when the sunlight is bad, and it is possible to reduce the time and expense of maintenance and the like.

  In recent years, as a new type of artificial turf, a long pile (pile with a length of, for example, 30 mm or more) is planted on a base fabric, and a filler is filled between the piles to improve stability and elasticity. Artificial grass is known (see, for example, Patent Documents 1 and 2).

JP 2001-254310 A JP 2003-096712 A

  However, since the conventional artificial turf with a filler uses an elastic filler as a filler, a characteristic that the sound generated when a person steps on the artificial turf is small (hereinafter referred to as “silence”). Have.

  Therefore, when a conventional artificial grass with a filler is installed in the above area, the sound generated even when an intruder steps into the site is small, making it difficult for the intruder to notice, resulting in poor security. It was.

The present invention has been made in view of the above-described problems.
That is, an object of the present invention is to provide an artificial turf that is excellent in crime prevention and excellent in landscape.

  As a result of studying in view of the above problems, the present inventors have used a hard filler as at least the uppermost filler, not only the hard filler but also the particle size and filling thickness, the pile length and gauge of artificial turf, By appropriately setting the relationship such as stitches, it has been found that an artificial turf that has an excellent landscape, emits a relatively loud sound when stepped on it, and is excellent in crime prevention can be obtained. Was completed.

That is, the gist of the present invention includes an artificial turf in which a pile is planted on a base fabric and a filler filled between the piles, and when the non-stepping sound volume measured by the following method is 60 dB or less, The artificial grass with a filler is characterized in that the difference between the volume at the time of treading and the volume at the time of non-pressing pressure measured by the method is 8 dB or more (Claim 1).
・ Measurement method of volume during non-stepping pressure:
In a state where the filler is substantially dry, a volume meter is installed at an installation height of 0 cm on the artificial turf with filler, and the minimum value of the volume obtained by performing the measurement for 1 minute is defined as the non-stepping volume.
・ Measurement method of volume during stepping pressure:
With the filler substantially dry, install a volume meter on the artificial turf with filler at a height of 0 cm and measure the maximum volume obtained by measuring for 1 minute under the following walking conditions. Use the hour volume.
・ Walking conditions:
A person with a weight of 52 kg or more wearing a rubber bottom sneaker of size 25cm or more is on the artificial turf with filler at a foot height such that the angle between the thigh and the artificial turf with filler is 45 degrees. Walk in a square area with a side of 1 m centered on the volume meter at a walking time of 100 steps / minute.

  Further, another gist of the present invention includes an artificial turf in which a pile is planted on a base fabric and a filler filled between the piles, and at least the uppermost layer of the filler has a sieve having an opening of 2 mm. The hard filler has a size that does not pass, and the ratio of the particle diameter of the hard filler to the gauge and / or stitch of the pile is 0.1 or more and 25 or less. The ratio of the filling thickness of the hard filler to the diameter is 0.2 or more and 18 or less, and the length of the pile protruding from the surface of the hard filler is 5 mm or more and 90 mm or less. The feature is an artificial grass with a filler (claim 2).

  Here, at least the uppermost layer of the filler is a hard filler having a size that does not pass through a sieve having an opening of 2 mm, and the ratio of the particle size of the hard filler to the gauge and / or stitch of the pile is equal to that of the hard filler. 0.1 to 25 and the ratio of the filling thickness of the hard filler to the particle diameter of the hard filler is 0.2 to 18 and the surface of the hard filler The length of the protruding pile is preferably 5 mm or more and 90 mm or less (Claim 3).

  Moreover, it is preferable that the gauge and / or stitch of this pile are 5 mm or more and 40 mm or less.

  Moreover, it is preferable that the length of this pile is 30 mm or more and 80 mm or less.

  Further, in the uppermost hard filler, the ratio of particles having a size that passes through a 35 mm sieve and does not pass through a 10 mm sieve is preferably 50% by weight or more. 6).

  Further, it is preferable that at least two kinds of fillers are filled in layers between the piles, and a hard filler different from the uppermost layer is present in the lowermost layer (Claim 7).

  The uppermost hard filler is preferably made of a porous material.

  Since the artificial turf with a filler according to the present invention emits a relatively loud sound when stepped on, it has an effect of being excellent in crime prevention.

  Hereinafter, the present invention will be described in detail with reference to embodiments, but the present invention is not limited to the following embodiments, and can be implemented with various modifications within the scope of the gist thereof. .

[I. Constitution]
FIG. 1 is a cross-sectional view schematically showing a partial structure of an artificial grass with a filler according to an embodiment of the present invention.
An artificial turf 1 with a filler shown in FIG. 1 includes an artificial turf 4 in which piles 3 are planted at a predetermined interval on a base fabric 2, and a hard filler 5 filled between the piles 3 of the artificial turf 4. The

  In the following description, first, the artificial turf 4 and the hard filler 5 that are the constituent elements of the artificial turf 1 with a filler are individually described, and then the configuration of the artificial turf 1 with a filler formed by combining them is described. Shall.

[I-1. (Artificial grass)
FIG. 2 is an upper perspective view schematically showing a partial configuration of the artificial turf 4 used in the artificial turf 1 with a filler shown in FIG. In FIG. 2, components common to those in FIG. 1 are denoted by common reference numerals.

  As shown in FIG. 2, the artificial turf 4 has a so-called tuft (woven fabric) structure in which a large number of piles 3 are planted (tufted) in rows at a predetermined interval on a base fabric 2.

  The material of the base fabric 2 is not limited, but for example, a woven fabric or a non-woven fabric made of a synthetic resin such as polypropylene (PP), polyethylene (PE), nylon (NY), polyethylene terephthalate (PET), etc. Used. Any of these may be used alone, or two or more of these may be used in any combination and ratio.

The thickness of the base fabric 2 is not limited and can be arbitrarily selected as long as the function of the artificial turf 4 is not hindered. Usually, a range of 1 mm or more and 3 mm or less is preferable.
The planar shape and the size of the base fabric 2 are also arbitrary, and may be appropriately selected according to the shape and use of the artificial turf 4 and the artificial turf 1 with a filler using the same.

  The pile 3 uses a fibrous material (this may be referred to as “pile material”), and both end portions thereof are from one surface of the base fabric 2 (this is the back surface of the base fabric 2) to the other. It is provided by projecting on a surface (this is the surface of the base fabric 2) and planting.

  The material of the pile material is not limited. For example, monofilament yarns, monotape yarns, split yarns (fineness 5500 to 5) made of synthetic resin such as polypropylene (PP), polyethylene (PE), nylon (NY), etc. 13000 dtex) is used. Any of these may be used alone, or two or more of these may be used in any combination and ratio.

As the shape of the pile material, an arbitrary material such as a monofilament yarn, a monotape yarn, or a split yarn can be used.
In particular, it is preferable to use a monofilament yarn or a monotape yarn as a pile material for construction reasons. When using these yarns, it is preferable to plant single yarns having a fineness of 400 to 2000 dtex on the base fabric 2 with a total fineness of 5500 to 13000 dtex. As for the pile 3 obtained by this, each single yarn spreads apart, and high covering property (particulate matter trapping property) is obtained.

  The length from the surface of the base fabric 2 to the tip of the pile 3 (the length indicated by the symbol H in FIG. 2. In the present invention, this is sometimes referred to as “pile length” or “pile length”) is usually 20 mm or more. In particular, a range of 30 mm or more, usually 100 mm or less, and particularly 80 mm or less is preferable. If the length of the pile 3 is too short, the landscape may be inferior. Moreover, even if the length of the pile 3 is too long, more materials may be required than the effect.

  In addition, when the length of the pile 3 is not uniform, the average value of the length of the pile 3 may be set to satisfy the above range, but usually 50% or more of the total number of the piles 3 is within the above range. It is preferable to satisfy.

  The planting interval between the tufting rows of the pile 3 (interval indicated by the symbol G in FIG. 2. In the present invention, this is sometimes referred to as “gauge”) is usually 2 mm or more, particularly 5 mm or more, and usually 50 mm or less. Especially, it is preferable that it is the range of 40 mm or less. If the gauge of the pile 3 is too short, the filler may not enter. On the other hand, if the gauge of the pile 3 is too long, the landscape may be damaged.

  Further, the planting interval of the piles 3 in the tufting row direction (interval indicated by symbol S in FIG. 2; in the present invention, this may be referred to as “stitch”) is usually 2 mm or more, particularly 5 mm or more. It is preferably in the range of 50 mm or less, especially 40 mm or less. If the stitches of the pile 3 are too short, the filler efficiency may deteriorate. On the other hand, if the stitches of the pile 3 are too long, the landscape may be damaged.

  In addition, when the gauge and / or stitch of the pile 3 are not uniform, the average value of the gauge and / or stitch of the pile 3 may satisfy the above range, but the gauge and / or stitch of the pile 3 may be satisfied. In general, it is preferable that 50% or more of the total number satisfies the above range.

Further, a backing material 6 is formed on the back side of the base fabric 2 so as to cover the center portion of the pile material exposed on the back side of the base fabric 2 in order to prevent the tufted pile 3 from falling off. Yes.
The material of the backing material 6 is not limited, and examples thereof include styrene-butadiene rubber (SBR), latex rubber, and urethane. Any of these may be used alone, or two or more of these may be used in any combination and ratio.
The method for forming the backing material 6 is not limited, but usually, after the pile 3 is tufted on the base fabric 2, it is formed by the coating method using the above-mentioned materials.
The coating amount of the backing material 6 is not limited, but is preferably in a range of usually 800 g / m ² or more and 1500 g / m ² or less in terms of dry weight.

[I-2. Hard filler)
In the present invention, examples of the “hard filler” include sand, quartz sand, crushed stone, and ceramics.
In particular, the hard filler is preferably a porous material, and examples thereof include natural stones fired at high temperature and siliceous lumps such as waste glass fired at high temperature. Any of these may be used alone, or two or more of these may be used in any combination and ratio.

  The shape of the hard filler 5 is usually particulate. Here, the term “particulate” is not limited to a spherical shape or a substantially spherical shape, and includes various shapes such as an uneven shape, a rod shape, a flat plate shape and the like as long as the filling rate and workability during filling are not significantly hindered. Shall be. However, it is desirable not to use a rod-like or flat plate as much as possible.

  The particle diameter of the hard filler 5 alone is preferably 2 mm or more, particularly 5 mm or more, particularly 10 mm or more, and usually 50 mm or less, especially 30 mm or less. If the particle size of the hard filler is too small, the sound may be reduced. On the other hand, if the particle size of the hard filler is too large, it may be difficult to fill.

  It is desirable that the hard filler 5 has a certain degree of assumed particle size in terms of suppressing variations in landscape and sound output. More than 50% of particles having the same particle size are present in the same layer. It is preferable.

In the present invention, the “deemed particle size” means that a sieve having a certain aperture (α mm) passes through substantially all of the screen and a mesh having an aperture of 5 mm smaller than the aperture ((α-5) mm) is 90% or more. The latter opening ((α-5) mm) in the case where the filler remains.
The assumed particle size is measured by shaking the screen manually or mechanically by moving it up and down and horizontally so that the filler constantly moves evenly through the screen and extracts what has passed or remained in one minute. To do.

In addition, as the hard filler 5, any one kind of hard filler 5 may be used independently, and 2 or more types of hard fillers 5 may be used together by arbitrary combinations and ratios.
When two or more kinds of hard fillers 5 are used in combination, they may be mixed in advance and then filled as a single layer, but it is also possible to form a multilayer structure by individually laminating and filling them.

In the case of a multi-layer structure, a hard filler that satisfies the above-mentioned regulations may be used as at least the uppermost filler. The case where the filler has a multilayer structure will be described in detail later. In that case, it is preferable to use a hard filler different from the uppermost layer for the lowermost layer. As the lowermost filler, a hard filler having a small particle diameter such as sand or quartz sand is particularly preferable. Thus, by using a filler different from the uppermost layer for the lowermost layer, the workability can be improved and the landscape can be improved.
In addition, in the uppermost layer, in addition to the hard filler that satisfies the above-mentioned regulations, in the range that does not impair the effects of the present invention, fillers with a small particle size such as sand and quartz sand, insect repellent function, small animal (cat etc.) repelling, Particles for the purpose of improving color tone or the like may be present.

[I-3. (Artificial grass with filler)
1 is filled with the above-mentioned hard filler 5 between the piles 3 of the artificial turf 4 described above, and satisfies the following characteristics.

That is, the ratio of the particle size of the hard filler 5 to the gauge and / or stitch of the pile 3 is usually 0.1 or more, preferably 0.25 or more, and usually 25 or less, preferably 6 or less. . If this ratio is too small, the sound may be reduced. On the other hand, if this ratio is too large, it may be difficult to fill.
Any one of the gauges and stitches of the pile 3 may satisfy the above range, but it is preferable that at least the gauge of the pile 3 satisfies the above range, and both the gauge and stitch of the pile 3 satisfy the above range. It is more preferable to satisfy | fill.

  Further, the ratio of the filling thickness of the hard filler 5 (the length indicated by the symbol T in FIG. 1) to the particle diameter of the hard filler 5 is usually 0.2 or more, preferably 0.6 or more, and usually It is 18 or less, preferably 7 or less. If this ratio is too small, the sound may be reduced. On the other hand, if this ratio is too large, it may be difficult to fill.

  The length of the pile 3 protruding from the surface of the hard filler 5 is usually 5 mm or more, preferably 10 mm or more, and usually 90 mm or less, preferably 60 mm or less. If this length is too small, the appearance may be impaired. On the other hand, if this length is too large, the sound may be reduced.

[I-4. (Configuration with multiple layers of filler)
Although the artificial grass 1 with a filler in FIG. 1 has a single layer made of the hard filler 5 on the base fabric 2, a plurality of layers made of the filler can be provided.

FIG. 3 is a cross-sectional view schematically showing a partial structure of an artificial grass with a filler according to another embodiment of the present invention. In FIG. 3, components common to those in FIGS. 1 and 2 are denoted by common reference numerals.
The artificial turf 1 ′ with filler shown in FIG. 3 has a plurality of layers (three layers in the figure) between the artificial turf 4 in which the piles 3 are planted on the base cloth 2 at predetermined intervals and the pile 3 of the artificial turf 4. In this way, it is composed of a plurality of (three in the figure) fillers 5, 5 ′, 5 ″ filled.

  The characteristics of the artificial turf 4 (base cloth 2 and pile 3) such as material and shape are the same as those of the artificial turf 4 (base cloth 2 and pile 3) shown in FIG.

  Further, among the fillers 5, 5 ′, 5 ″, the characteristics such as the material and shape of the uppermost filler 5 are the same as those of the hard filler 5 shown in FIG. .

On the other hand, the material of the fillers other than the uppermost layer (intermediate layer and lowermost layer fillers) 5 ′, 5 ″ is not limited to those satisfying the provisions of the filler (hard filler) 5, and any material can be used. Can be used.
However, as the fillers other than the uppermost layer (intermediate layer and lowermost layer fillers) 5 ′, 5 ″, the uppermost layer filler (hard filler) 5 has an effect of emitting a relatively loud sound when stepped on. Therefore, it is preferable to use hard fillers as fillers other than the uppermost layer (intermediate layer and lowermost layer fillers) 5 ′ and 5 ″.
Other characteristics (shape, filling thickness, etc.) of the fillers other than the uppermost layer (intermediate layer and lowermost layer fillers) 5 ′, 5 ″ can be arbitrarily selected.

  Further, the artificial grass 1 ′ with a filler shown in FIG. 3 has a ratio of the diameter of the hard filler 5 to the gauge and / or stitch of the pile 3, and the filling thickness of the hard filler 5 to the diameter of the hard filler 5. And the length of the pile 3 protruding from the surface of the hard filler 5 are all the above-mentioned [I-3. It is configured to satisfy the provisions described in the section “Artificial grass with filler”.

  In addition, in the artificial grass 1 ′ with a filler shown in FIG. 3, the three kinds of fillers 5, 5 ′, 5 ″ are filled to form one layer each, but the number of layers of the filler is this. However, the number of layers may be two or four or more, as long as the uppermost filler satisfies the same rules as those of the hard filler 5 shown in FIG. Each layer may contain two or more fillers.

[II. Characteristic]
The artificial turf with a filler according to the present invention, represented by the artificial turf with a filler 1 and 1 'according to each embodiment described above, has the following characteristics.

[II-1. (Pressing volume)
The artificial grass with a filler according to the present invention has a characteristic that it emits a relatively loud sound when stepped on.

Specifically, when the non-stepping pressure sound volume measured by the following method is 60 dB or less, the difference between the treading pressure sound volume and the non-pressing pressure sound volume measured by the following method is 8 dB or more. Preferably, this difference is 10 dB or more, particularly preferably 30 dB or more.
・ Measurement method of volume during non-stepping pressure:
With the filler substantially dry, install a volume meter on the artificial turf with filler at a height of 0 cm (that is, directly) and measure for 1 minute. Use the hour volume.
・ Measurement method of volume during stepping pressure:
It was obtained by placing a volume meter on an artificial turf with a filler at a height of 0 cm (that is, directly) in a state where the filler was substantially dry, and measuring for 1 minute under the following walking conditions. The maximum volume is set as the treading volume.
・ Walking conditions:
A person weighing 52 kg or more wearing a rubber bottom sneaker with a size of 25 cm or more has an angle between the thigh and the artificial grass with a filler of about 45 degrees (± 5 degrees is an error range). Walking at a walking speed of approximately 100 steps / minute (with an error range of ± 10 steps / minute) within a square area of 1 meter on the center of the sound level meter on the artificial grass with filler. To do.
For example, a sound level meter can be used as the volume meter. An example of a sound level meter is a sound level meter SD-2200 manufactured by Fuso Rika Products Co., Ltd.

As described above, the artificial turf with a filler according to the present invention has a characteristic that the sound volume at the time of stepping is relatively large, and thus has an effect of being excellent in crime prevention.
On the other hand, the upper limit of the difference between the stepping pressure sound volume and the non-pressing pressure sound volume is not particularly limited, but is usually 60 dB or less, preferably 50 dB or less in consideration of noise characteristics and the like.

  Note that the sound generated when the artificial turf with a filler of the present invention is stepped on varies depending on the type of hard filler, etc., but is a sound that can be heard by a human ear, for example. These sounds have the effect of deterring intruders.

In addition, the artificial grass with a filler according to the present invention also has a characteristic that the volume during stepping is less likely to be lower than when a hard filler is laid alone.
Although the reason for this is not clear, it is assumed that the artificial turf piles are appropriately present between the hard fillers, so that the hard fillers are prevented from being compacted, and the volume during depression is less likely to decrease. The

[II-2. Temperature rise suppression)
In addition, the artificial turf with a filler according to the present invention has characteristics of retaining water when water is sprinkled and suppressing the temperature rise in the surrounding environment.

[III. Others]
Although the artificial grass with filler of the present invention has been described above, the artificial grass with filler of the present invention can be defined in terms of both configuration and characteristics.
In other words, it has a basic structure comprising an artificial turf in which a pile is planted on a base fabric and a hard filler filled between the piles, and has only a hard filler for pile gauges and / or stitches. The ratio, the ratio of the filling thickness of the hard filler to the particle size of the hard filler, and the length of the pile protruding from the surface of the hard filler are all described in [I-3. Satisfy the provisions described in the section of “Artificial turf with filler”, or the volume at the time of treading is the above described [II-1. If the regulation described in the column of “stepping pressure volume” is satisfied, it corresponds to the artificial grass with a filler of the present invention.

  As described above, the artificial turf with a filler according to the present invention has a characteristic that the sound volume at the time of stepping is relatively large. In addition, it preferably has a characteristic of suppressing the temperature rise in the surrounding environment. Therefore, it can be used for various purposes where conventional artificial turf is used, but in particular, the area near the entrance and bathroom in the site of a building such as a house, the area near a changing room or toilet in the site of a school or public facility, etc. Suitable for installation in an area or the like.

  EXAMPLES Hereinafter, although this invention is demonstrated still in detail using an Example, this invention is not limited to a following example, unless the summary is exceeded.

[I. Production of artificial turf with filler (Examples 1 to 5, comparative example)]
An artificial turf with a filler was produced by the following procedure.

  In any of the examples and comparative examples, a polypropylene base fabric (thickness: about 1 mm), a 55 mm long polyethylene monotape yarn, 18 stitches / 10 cm and a gauge of 19.05 mm (3/4) The planted artificial turf was used.

The artificial turf was filled with the filler shown in the following Table 1 so as to be the same as shown in Table 1 below.
In the table below, “filling thickness” represents the thickness from the surface of the base fabric to the top surface of the filler after filling (value indicated by the symbol T in FIG. 1).
Further, the “upper pile length” represents the length of the pile protruding from the upper surface of the filler after filling (value indicated by the symbol L in FIG. 1).

The filling of the filler was performed according to the following procedures (i) to (iii).
(I) Each filler was manually filled between artificial turf piles.
(Ii) Using a rake, the leveling operation was performed so that the pile length protruding from the upper surface of the filler was about 20 mm.
(Iii) For the filler having a large particle size (Example 1 and Example 3), the leveling work was further performed manually.

  The artificial grass with fillers prepared by the above procedure is called artificial grass with fillers of Examples 1 to 5 and Comparative Example, respectively.

[II. Volume measurement during treading]
Using the artificial grass with fillers of Examples 1 to 5 and Comparative Example, the volume at the time of non-stepping pressure and the volume at the time of stepping pressure were measured by the following procedure.

・ Measurement of volume when not treading:
A measurement area of 1 m × 1 m was set in an artificial grass placed outdoors, and a volume meter (Noise Meter SD-2200 manufactured by Fuso Rika Products Co., Ltd.) was installed at the center, and measurement was performed for one minute. The minimum value of the volume obtained by this measurement was defined as the non-depressing volume.
・ Measurement of treading volume:
A measurement area of 1 m × 1 m was defined in an artificial turf placed outdoors, and a volume meter (Noise Meter SD-2200 manufactured by Fuso Rika Products Co., Ltd.) was installed at the center. Next, the experimenter (weight 52 kg) walked for 1 minute around the volume measuring machine so as to satisfy the above “walking conditions”, and the volume during that time was measured. This walking and volume measurement was performed 5 times per sample. The maximum value of the volume obtained by this measurement was determined as the volume at the time of stepping. The results are shown in Table 2 below.

  From Table 2 above, it can be seen that the artificial turf with fillers of Examples 1 to 5 has a louder volume at the time of stepping pressure than the artificial turf with fillers of the comparative examples.

Further, the stepping pressure when the fillers used in the artificial turf with fillers of Examples 1, 2, 4 and 5 (hereinafter referred to as the fillers of Reference Examples 1, 2, 4 and 5) are used alone. The hour volume was measured according to the following procedure.
A measurement area of 0.5 m × 0.5 m was defined on the outdoor ground, and a filler was spread over with a thickness of 3.5 cm. Thereafter, the volume at the time of non-stepping pressure and the volume at the time of stepping pressure were measured by the same method as in the case of the artificial turf with filler described above. The results are shown in Table 3 below.

  From the comparison between Table 2 and Table 3 above, the filler used in the artificial turf with fillers of Examples 1, 2, 4, and 5 (fillers of Reference Examples 1, 2, 4, and 5) is the filler. When used alone, it can be seen that the volume at the time of treading is small compared to the case where artificial grass is filled.

[III. Temperature rise suppression measurement]
About the artificial grass with a filler of Examples 1-5 and a comparative example, the temperature rise inhibitory effect was evaluated by the following procedures.

A measurement area of 1 m × 1 m was defined in an artificial turf installed outdoors, and a thermometer was installed at the center of the surface. One liter of water was sprayed in this measurement area, and the temperature change before and after watering was measured every 15 minutes. The results are shown in Table 4 below.
In Table 4, the numbers in the “hour” column represent the elapsed time (minutes) when “0” is set immediately after watering. The uppermost “-” represents before watering.
Measurements were taken on a sunny day in September. The artificial turf was installed around 15:00 the day before and the watering was carried out around 11:30 on the day.

As is clear from Table 4 above, in all of Examples 1 to 5 and the comparative example, the measured temperature decreases immediately after watering, and then gradually increases.
However, the artificial turf with fillers of Examples 1 to 5 is lower in temperature before and after watering, and the temperature increase after watering is generally suppressed as compared with the artificial turf with filler in the comparative example. I understand.

  The artificial turf with a filler according to the present invention can be used for various applications in which conventional artificial turf is used, and among them, the area near the entrance and bathroom in the site of a building such as a house, school, public facilities, etc. It is suitable for installation in a changing room on the site or an area near the toilet.

It is sectional drawing which shows typically the partial structure of the artificial grass with a filler concerning one Embodiment of this invention. It is an upper perspective view which shows typically the partial structure of the artificial turf used for the artificial turf with a filler of FIG. It is sectional drawing which shows typically the partial structure of the artificial grass containing a filler concerning other embodiment of this invention.

Explanation of symbols

1, 1 'Artificial grass 2 Base cloth 3 Pile 4 Artificial grass 5, 5', 5 "Filler 5 Hard filler 6 Backing material

Claims (8)

An artificial turf with piles planted on a base fabric, and a filler filled between the piles;
The artificial grass with a filler, wherein the difference between the non-stepping sound volume and the non-pressing sound volume measured by the following method is 8 dB or more when the non-stepping sound volume measured by the following method is 60 dB or less.
・ Measurement method of volume during non-stepping pressure:
In a state where the filler is substantially dry, a volume meter is installed at an installation height of 0 cm on the artificial turf with filler, and the minimum value of the volume obtained by performing the measurement for 1 minute is defined as the non-stepping volume.
・ Measurement method of volume during stepping pressure:
With the filler substantially dry, install a volume meter on the artificial turf with filler at a height of 0 cm and measure the maximum volume obtained by measuring for 1 minute under the following walking conditions. Use the hour volume.
・ Walking conditions:
A person with a weight of 52 kg or more wearing a rubber bottom sneaker of size 25cm or more is on the artificial turf with filler at a foot height such that the angle between the thigh and the artificial turf with filler is 45 degrees. Walk in a square area with a side of 1 m centered on the volume meter at a walking time of 100 steps / minute. An artificial turf with piles planted on a base fabric, and a filler filled between the piles;
At least the uppermost layer of the filler is a hard filler having a size that does not pass through a sieve having an opening of 2 mm,
The ratio of the particle size of the hard filler to the gauge and / or stitch of the pile is 0.1 or more and 25 or less,
The ratio of the filling thickness of the hard filler to the particle diameter of the hard filler is 0.2 or more and 18 or less, and
The artificial grass with a filler, wherein the pile protruding from the surface of the hard filler has a length of 5 mm or more and 90 mm or less. At least the uppermost layer of the filler is a hard filler having a size that does not pass through a sieve having an opening of 2 mm,
A ratio of the particle size of the hard filler to the pile gauge and / or stitch is 0.1 or more and 25 or less,
The ratio of the filling thickness of the hard filler to the particle diameter of the hard filler is 0.2 or more and 18 or less, and
The artificial grass with a filler according to claim 1, wherein the length of the pile protruding from the surface of the hard filler is 5 mm or more and 90 mm or less.   The artificial grass with a filler according to any one of claims 1 to 3, wherein the pile has a gauge and / or stitches of 5 mm or more and 40 mm or less.   The artificial grass with a filler according to any one of claims 1 to 4, wherein the pile has a length of 30 mm or more and 80 mm or less.   The proportion of particles having a size that passes through a 35 mm sieve and does not pass through a 10 mm sieve in the hard filler of the uppermost layer is 50 wt% or more. The artificial grass with a filler as described in any one of 1-5.   The at least two kinds of fillers are filled in layers between the piles, and a hard filler different from the uppermost layer is present in the lowermost layer, according to any one of claims 1 to 6. Artificial grass with filler as described.   The artificial turf with filler according to any one of claims 1 to 7, wherein the uppermost hard filler is made of a porous material.

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