JPH11280018A - Artificial lawn and manufacture thereof and basic material for artificial lawn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide artificial lawn reducing the dimensional change of a basic material for changes of the environment such as changes of temperature and the addition of water and enabling stable mass production to be conducted at a low cost. SOLUTION: A foundation sheet material 11 is provided with a basic material 13 provided with an elastic layer 12 substantially integrally on a top face thereof, and many piles 14 are planted on the basic material 13 so as to pass through the foundation sheet material 11 from an elastic layer 12 side. In this case, the elastic layer 12 is made of synthetic resin foaming body, and either of heating treatment and pressurizing treatment is applied on the elastic layer 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an artificial turf, and more specifically, a small dimensional change of a base material due to an environmental change such as a change in temperature, addition of moisture, or irradiation of sunlight, and enables stable mass production at a low cost. TECHNICAL FIELD The present invention relates to an artificial turf, a method for producing the same, and an artificial turf base material suitable for the artificial turf.

[0002]

2. Description of the Related Art Artificial turf is made of a sheet-like substrate in which a number of synthetic resin piles are planted, and has high pile strength and good drainage, so that it is almost maintenance-free and can withstand continuous use. For this reason, it has rapidly spread in recent years as an alternative to natural lawn.

Along with this, various improvements have been made in order to realize an artificial grass which is safer and easy to move, and a proposal has been made to provide an elastic layer on the surface of the base material, especially in order to reduce the impact force on players and the like. Many have been done.

[0004] For example, in Japanese Patent Application Laid-Open No. Hei 8-109610, a synthetic resin is attached to a base cloth in which an elastic sheet is integrally joined to the upper surface of a fiber base material so that turf leaves are planted on the elastic sheet side. While tufting pile yarn,
An artificial lawn in which a backing material is provided on the lower surface of a fiber base material has been proposed.

As seen in this conventional example, generally, an elastic sheet is a relatively bulky sheet having flexibility and cushioning properties, for example, a synthetic resin foam such as polypropylene or polyethylene, urethane rubber, or the like. This elastic sheet material is integrally bonded to a fiber base material with an adhesive such as urethane or epoxy. In the case of sand, a filler such as sand is filled in the grass on the elastic sheet.

[0006]

According to this, although the cushioning property is certainly improved by the presence of the elastic sheet, on the other hand, the following problems arise due to the provision of the elastic sheet. .

[0007] That is, most of the elastic sheet material is made of the foam as described above.
Since the residual strain stress and the latent bubbles and molecules are latent, the dimensions are apt to change due to temperature change or addition of moisture, and this causes blisters and tears on the turf surface.

In the case of laying on an athletic stadium, for example, an artificial lawn of about 400 m ² is required for a tennis court and about 10,000 m ^{2 for} a ground, and a daily lawn is laid on a veranda of a house or a roof of a building. A product with a large area is required as compared with a simple product.

[0009] According to the current general artificial turf manufacturing apparatus, an artificial turf having a width of about 3.6 m at a maximum can be continuously produced. , An artificial lawn about 50 m long is required.

[0010] Considering the workability at the site, it is preferable that the artificial turf is carried into the site as a roll and can be laid while being rolled as it is. However, when the elastic sheet material is made of foam, a certain thickness is required. For this reason, even if it is wound up in a roll, there is a limit to the winding length.

For this reason, the artificial turf is wound up on a small-diameter roll, and if the length is not enough at the construction site, the end of the roll is joined to the start of another roll. However, the number of joints is inevitably increased, and in particular, swelling and tearing may occur at those joints, which is not preferable.

The present invention has been made to solve such conventional problems, and an object thereof is to provide a base material having a small dimensional change due to an environmental change such as a temperature change, moisture addition, or sunlight irradiation. To provide an artificial turf that can be wound up as a long roll and that can be stably mass-produced at low cost, a method of manufacturing the same, and a base material for the artificial turf suitable for the artificial turf. is there.

[0013]

In order to achieve the above object, the present invention provides a base material comprising a base sheet material and an elastic layer provided substantially integrally on an upper surface of the base sheet material,
In an artificial turf in which a number of piles are planted so as to penetrate the base sheet material from the elastic layer side on the base material, the elastic layer is made of synthetic resin foam, and the elastic layer is heated by heating. It is characterized in that at least one of a treatment and a pressure treatment is performed.

According to this configuration, unstable factors existing inside the foam, such as residual strain stress, unstable bubble state, and unstable molecules, which are latent in the foam, are removed. An artificial grass having good dimensional stability against addition or the like can be obtained.

It is most preferable that the above-mentioned heating / pressing treatment is performed on the foam alone before being attached to the base sheet material. However, when the adhesive is applied to the foam alone or the foams are separated from each other. It may be performed at the time of width joining in which the end faces in the width direction are joined to each other.

When the foam is attached to a base sheet material, the above-mentioned treatment may be performed. Alternatively, the treatment may be performed after planting a pile on the base material after the attachment. In short, in any case,
What is necessary is just to make sure that the heat / pressure treatment is applied to the foam.

In the present invention, it is preferable that at least one of the heat treatment and the pressure treatment for the elastic layer is performed before the pile is planted. According to this, since the elastic layer is already stable before the pile is planted, it is possible to reduce the possibility that the piles become uneven compared to the case where the processing is performed after the pile is planted.

Another feature of the present invention is that the synthetic resin foam constituting the elastic layer is of an olefin type, preferably of a crosslinked type. That is, by being an olefin type, a chemically stable elastic layer having a small water absorption can be obtained.

In order to form a crosslinked product such as an olefin resin which does not have a three-dimensional structure using only the material, there are mainly electron beam crosslinking and chemical crosslinking. Is high, the dimensional change can be reduced, and therefore, chemical crosslinking is preferably employed.

In the present invention, the base sheet material is preferably made of a woven fabric made of fiber. In other words, woven fabrics have extremely high dimensional stability compared to nonwoven fabrics and resin sheets, and can be joined integrally with the foam, so that dimensional changes of the foam are suppressed and foam as an elastic layer during tufting of the pile. The body breaking phenomenon can be reduced as much as possible.

The width of the base material is preferably as wide as 1.5 m or more. Generally, artificial grass is carried into a construction site as a roll body, and is laid as a strip-shaped row on a base substrate while rolling the roll body. Therefore,
Since the width of the base material is small, the number of joints between rows is reduced, thereby facilitating construction. In particular, it is suitable for construction of tennis courts and grounds that are relatively large both vertically and horizontally.

The width of a conventional synthetic resin foam is limited due to the limitations of the production equipment such as an extruder, and it is currently difficult to produce a foam having a width of about 1 m or more. . In view of this, the present invention is characterized in that a plurality of the elastic layers having a width smaller than that are provided in parallel with the base sheet material, and the end faces of the respective elastic layers are fusion-bonded. Thereby, for example, a wide artificial grass having a width of 1.5 m or more can be easily obtained.

The present invention also includes an embodiment in which the base sheet material and the elastic layer are integrally joined by a heat-sensitive and / or pressure-sensitive adhesive. Specifically, after applying and drying a heat-sensitive and / or pressure-sensitive adhesive on at least one of the mating surfaces of the base sheet material and the elastic layer, the two are stacked and heated in a bonding apparatus. By pressing, the base sheet material and the elastic layer can be integrally joined.

Further, in the manufacturing method of the present invention, an elastic layer made of a synthetic resin foam is provided on the base sheet material to form a base material, and the base sheet material is penetrated from the elastic layer side to the base material. When a large number of piles are planted, the base sheet material and the synthetic resin-based foam are bonded to each other with a heat-sensitive and / or pressure-sensitive adhesive. It is characterized in that the resin-based foam is simultaneously subjected to heat-sensitive and / or pressure-sensitive treatment.

Further, the present invention also includes an artificial turf base material in which a base sheet material and a synthetic resin foam as an elastic layer are integrally bonded by a heat-sensitive and / or pressure-sensitive adhesive. The use of the material makes it possible to obtain an artificial turf having good dimensional stability against changes in temperature and addition of moisture.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION Next, in order to better understand the technical concept of the present invention, an embodiment will be described with reference to the drawings.

As shown in the cross-sectional view of FIG. 1, the artificial turf 10 includes a base material 13 in which an elastic layer 12 is formed on a base sheet material (base base material) 11. Substrate 1
In 3, a large number of piles (artificial grass yarns) 14 are planted. In this embodiment, in the grass between the piles 14,
A granular material such as sand is filled as the filler 15.

As the base sheet material 11, a woven fabric, a nonwoven fabric, a resin sheet, or the like can be appropriately selected and used. However, if the dimensional stability is evaluated to be good, a plain woven polypropylene base fabric is preferable. is there.

The elastic layer 12 is made of a synthetic resin foam sheet. Preferably, an olefin foam such as polyethylene or polypropylene is employed. The expansion ratio can be selected as appropriate, but from the viewpoint of the tufting property of the pile 14 and the appropriate cookability given to the player, it is preferably 8 to 40 times, and more preferably 10 to 35 times.

It is a basic condition that the thickness of the elastic layer 12 is smaller than the length of the pile 14.
Preferably, it is selected from the range of 3 to 8 mm. The thickness of the elastic layer is a thickness after the heat / pressure treatment.

Various materials such as synthetic resin fibers and natural fibers are used for the pile 14. Also, in this embodiment,
A backing material 16 is provided on the back side of the base sheet material 11. The artificial turf 10 is laid on the base substrate 17, and the base substrate 17 may be made of any material as long as the entire surface is uniformly flat. In addition to concrete and asphalt, crushed stones, elastic sheets, cast-in-place elastic bodies, sheets having water-permeable holes (or water-permeable), and the like can be given as examples.

Next, based on FIG.
Will be described for each step. In FIG.
A foam sheet 12a used as the elastic layer 12 is shown. The foam sheet 12a is manufactured by, for example, an extruder (not shown). However, even with the existing manufacturing equipment, the widest one can obtain only about 1 m in width.

On the other hand, the width of the base sheet material 11 is not particularly limited, and it is usually the easiest to handle when constructing artificial grass used for tennis courts and grounds, and it has few joints. For reasons such as simplification, those having a width of about 4 m are widely used.

In the present invention, for example, as shown in FIG. 2B, for example, two foam sheets 12a, 12a
Are arranged in parallel, their end faces are melted and joined together to obtain one wide elastic layer 12.
More specifically, the width direction end surfaces of the foam sheets 12a are cut with a cutter or the like to obtain clean parallel end surfaces, and the respective end surfaces are abutted to each other and heated and joined by a heating iron or the like.

Next, as shown in FIG.
The base sheet material 11 and the elastic layer 12 are integrally bonded to form the base material 13. For this bonding, a heat-sensitive and / or pressure-sensitive adhesive is used. For example, a widely used chloroprene-based adhesive can be used.

This adhesive is applied to both or one of the mating surfaces of the base sheet material 11 and the elastic layer 12 and dried. Immediately after the two are superposed or while heating, they are pressed in the thickness direction through the pressure rollers. Thereby, the heat / pressure treatment is performed on the elastic layer 12 and the base material 13 in which the elastic layer 12 and the base sheet material 11 are integrally bonded is obtained.

Thereafter, the base material 13 is put into a tufting machine (not shown), and as shown in FIG.
The pile 14 is planted in 3. The condition of the tuft can be arbitrarily selected. In this case, in the step shown in FIG. The pile 14 can be tufted in the most stable state.

In this embodiment, the backing material 16 is provided on the back side of the base sheet material 11 after the tufting of the pile 14. As the backing material 16, for example, NR / SBR latex or the like is used, which is cured by heating at, for example, about 120 ° C.

In this way, the artificial turf 10 having the elastic layer 12 subjected to the heat / pressure treatment is obtained. In order to impart water permeability, the artificial turf 10 is perforated so as to penetrate the base material 13 and the backing material 16. Can also be performed.

[0040]

Next, Examples 1 to 8 and Comparative Examples 1 and 2 will be described.
Will be described. In each case, 60
00d polypropylene split tape thread
/ 16Ge, 4.5St planting condition, 25 ± 5 ° C
Tufted artificial turf planted in the factory. The following test was performed for each example. The width of the elastic layer (elastic sheet) used as the base material was approximately 1 m, which is a commercially available size.

Dimensional change with respect to temperature: The surface of the artificial turf was heated to a maximum temperature (80 ° C.) assumed under the hot summer sun, and the state of the surface of the artificial turf was observed. Mass productivity: It was evaluated whether a continuous artificial lawn could be easily created in a factory, that is, the productivity of a wide and long artificial lawn was evaluated. Cost performance: High and low manufacturing costs were compared. Workability: Workability (construction time, construction workability and construction accuracy) was evaluated in total. Appearance: The properties of the artificial grass surface were observed. Durability: A weight having a ground contact surface shape of 50 mm in diameter was placed on the ground surface for 60 days, and the properties of the elastic layer when the weight was removed were observed.

Each item was evaluated as ◎ = very good, 〜-
〇 = good, 〇 = somewhat good, 〇-〇 = normal, △ = bad, ×
= Very poor 6-level evaluation, and finally these items were put together for comprehensive evaluation.

Example 1 A plain woven polypropylene cloth was used as a base sheet material. A polyethylene foam (expansion ratio 15 times, electron beam cross-linking) was used for the elastic layer. The base sheet material and the elastic layer were bonded to each other with a urethane-based one-liquid adhesive to form a base material. After a pile was planted on the base material, the base material was passed through a heating tank at 100 ° C. to perform a heat treatment. . Thus, an artificial lawn having a width of 1.0 m and a length of 100 m was produced. When each item was evaluated, the dimensional change with respect to temperature was very good (◎), the mass productivity was slightly better, the cost was slightly better, the workability was slightly better, and the appearance was better. Slightly good and durability were slightly good, and the overall evaluation was slightly good.

Example 2 The same base material, elastic layer and adhesive as in Example 1 were used. Example 2
Then, the base material to which the base sheet material and the elastic layer were adhered was subjected to heat treatment by first passing through a heating tank at 100 ° C., and thereafter, a pile was planted on the base material. In this way, an artificial lawn having a width of 1.0 m and a length of 100 m was produced in the same manner as in Example 1. And when we evaluated each item,
Dimensional change with respect to temperature is extremely good (◎), mass productivity is slightly good (〇), cost is slightly good (〇), workability is slightly good (〇), appearance is ◎ to 良好 good, and durability is slightly good (〇). The overall evaluation was somewhat favorable.

Example 3 The same basic sheet material and elastic layer as in Example 1 were used. In Example 3, the base sheet material and the elastic layer were bonded using a heat-sensitive adhesive as an adhesive. At this time, the bonding surface side of the elastic layer is
After heating to 0 ° C., it was subsequently passed between compression rollers. That is, heat / pressure treatment was performed simultaneously with the adhesion. Thereafter, a pile was planted on the substrate. In this way, an artificial lawn having a width of 1.0 m and a length of 100 m was produced in the same manner as in Example 1. When the evaluation of each item was carried out, the dimensional change with respect to temperature was very good ◎, the mass productivity was ◎ ~ 〇, the cost was very good ◎, the workability was 〇 slightly good, and the appearance was ◎. 〇 to 〇 were good, and the durability was somewhat good. 総 合 to 〇 as good overall evaluation.

Example 4 The basic sheet material used was the same plain woven fabric made of polypropylene as in Example 1. In Example 4, however, a polyethylene foam (foaming ratio 15 times,
Chemical cross-linking) was used, and a heat-sensitive adhesive was used as in Example 3. When bonding the base sheet material and the elastic layer with a heat-sensitive adhesive in the same manner as in Example 3, the bonding surface side of the elastic layer was heated to 100 ° C. with a heater, and then passed between the compression rollers. That is, heat / pressure treatment was performed simultaneously with the adhesion. Thereafter, a pile was planted on the substrate. Thus, as in the first embodiment, the width 1.0
m, an artificial grass having a length of 100 m was produced. When the evaluation of each item was performed, the dimensional change with respect to temperature was extremely good (◎), the mass productivity was good (◎ to 、), and the cost was ◎.
Was very good, the workability was somewhat good, the appearance was very good with ◎, the durability was very good with ◎, and the overall evaluation was very good with ◎.

Fifth Embodiment Although the overall structure is almost the same as that of the fourth embodiment, in the fifth embodiment, the width of the artificial grass is set to 4.0.
m. That is, with respect to a base sheet material having a width of 4.0 m, four elastic layers having a width of 1.0 m are prepared, and they are juxtaposed, and the end faces are fusion-bonded to form one elastic layer. The base sheet was bonded with a heat-sensitive adhesive. At that time, the adhesive surface side of the elastic layer was heated to 100 ° C. by a heater, and then passed between the compression rollers. That is, heat / pressure treatment was performed simultaneously with the adhesion. Thereafter, a pile was planted on the substrate. Thus, a width of 4.0 m and a length of 100 m
Was made. Then, when each item was evaluated, dimensional change with respect to temperature, mass productivity, workability,
Both appearance and durability are extremely good with ◎,
In addition, the cost performance was good in ◎ to 〇, the highest as a comprehensive evaluation, and extremely good in ◎.

Example 6 The basic sheet material used was the same plain woven fabric made of polypropylene as in Example 1, but in Example 6, a urethane foam (expansion ratio 15 times, crosslinked) was used for the elastic layer. A quick-drying adhesive was used as the adhesive. Then, when bonding the base sheet material and the elastic layer with the quick-drying adhesive, the base material was passed through a heating tank at 100 ° C. and heat-treated. Thereafter, a pile was planted on the substrate. Thus, an artificial lawn having a width of 1.0 m and a length of 100 m was produced. Then, when the evaluation of each item was performed, the dimensional change with respect to temperature was very good with ◎, the mass productivity was slightly better with 〇, the cost was also slightly better with 〇, the workability was slightly better with 、, and the appearance was ◎. Very good, the durability was good from ◎ to 〇, and the overall evaluation was somewhat good from 〇.

Example 7 A base sheet material was a nylon nonwoven fabric. The same urethane foam (expansion ratio 15 times, cross-linking) as in Example 6 was used for the elastic layer, and the same urethane-based one-component adhesive as in Example 1 was used as the adhesive. After bonding the base sheet material and the elastic layer with a urethane-based one-component adhesive, in Example 7, a pile was first planted on the base material. Next, heat treatment was performed by passing through a heating tank at 100 ° C. Thus, an artificial lawn having a width of 1.0 m and a length of 100 m was produced. Then, when the evaluation of each item was performed, the dimensional change with respect to temperature, mass productivity, cost, workability, and appearance were all slightly good, and only the durability was good in ◎ to 〇. The overall evaluation was slightly good.

Example 8 As in Example 1, a plain woven cloth made of polypropylene was used for the base sheet material, and a polyethylene foam (expansion ratio: 15 times, electron beam crosslinking) was used for the elastic layer. The adhesive was a quick-drying adhesive. In Example 8, the width of the base sheet material was 1.6 m. On the other hand, two elastic layers having a width of 0.8 m are prepared, they are juxtaposed, and the end faces are melt-bonded to form one elastic layer. Adhered to. Then, after the base material was passed through a compression roller having a compression ratio of 200% and subjected to a pressure treatment, a pile was planted. Thus, width 1.
An artificial grass having a length of 6 m and a length of 100 m was produced. Then, when the evaluation of each item was performed, the dimensional change with respect to temperature was extremely good (、), the mass productivity was slightly good (〇), the cost was good (◎ -〇), the workability was good (◎ -〇), and the appearance was good. ◎
〇 to 〇 were good, and the durability was somewhat good. 総 合 to 〇 as good overall evaluation.

Comparative Example 1 As in Example 1, a plain woven cloth made of polypropylene was used as the base sheet material, and a polyethylene foam (expansion ratio: 15 times, electron beam crosslinking) was used for the elastic layer. In Comparative Example 1, the base sheet material and the elastic layer were bonded with a urethane adhesive, and a pile was planted on the base material without performing any heat / pressure treatment. An artificial lawn of 100 m in length was produced. When the evaluation of each item was performed, the dimensional change with respect to temperature
Mass production is slightly better, cost is slightly better,
The workability was slightly good, the appearance was intermediate between △ and ×, the durability was poor, and the overall evaluation was poor.

<Comparative Example 2> As the base sheet material, the same polypropylene plain woven fabric as in Example 1 was used.
In this example, a chloroprene rubber foam (expansion ratio 5 times, crosslinked) was used as the elastic layer. The base sheet material and the elastic layer were adhered to each other with a urethane adhesive.
Without applying pressure treatment, a pile was planted on the base material to produce an artificial lawn having a width of 1.0 m and a length of 100 m.
When the evaluation of each item was performed, the dimensional change with respect to temperature was normally in the range of 〇 to △, and mass productivity was extremely poor in ×.
The cost is poor for △, the workability is extremely poor for ×,
The appearance was normal (〇) and the durability was good (◎ to 〇), but the overall evaluation was poor (△) as in Comparative Example 1.

Tables 1 and 2 show the test results of Examples 1 to 8 and Comparative Examples 1 and 2 for easy comparison.

[0054]

[Table 1]

[Table 2]

[0055]

As described above, according to the present invention,
The following effects are obtained. First, the elastic layer is made of a synthetic resin-based foam, and the elastic layer is subjected to at least one of a heat treatment and a pressure treatment. Since unstable factors such as unstable molecules existing inside the foam are removed, an artificial turf having excellent dimensional stability against environmental changes such as temperature change and moisture addition can be obtained.

By performing at least one of the heat treatment and the pressure treatment on the elastic layer before the pile is planted, the elastic layer is already stabilized before the pile is planted. Compared with the case where the processing is performed later, the possibility that the piles become uneven can be reduced.

Further, by making the synthetic resin foam constituting the elastic layer an olefin-based, preferably cross-linked, preferably chemically cross-linked, an elastic layer having a small water absorption and being chemically stable can be obtained. .

By using a fiber woven fabric as the base sheet material, the bonding property with the foam is good, the dimensional change of the foam is suppressed, and the foam as the elastic layer at the time of tufting the pile is used. The breaking phenomenon can be reduced as much as possible.

Further, according to the present invention, a plurality of elastic layers having a smaller width are juxtaposed to the base sheet material, and the end faces of the respective elastic layers are fusion-bonded to each other. A wide artificial lawn having a width of 0.5 m or more can be easily obtained.
Therefore, the number of joints is reduced,
Construction becomes easy.

Furthermore, by integrally joining the base sheet material and the elastic layer with a heat-sensitive and / or pressure-sensitive adhesive, the elastic layer can be simultaneously heated / pressed in the bonding step. In addition, simplification of the manufacturing process and reduction of time are achieved, and accordingly, productivity is improved.

[Brief description of the drawings]

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

FIG. 2 is a schematic view illustrating a manufacturing process of the artificial turf of the present invention.

[Explanation of symbols]

 Reference Signs List 10 artificial grass 11 base sheet material 12 elastic layer 12a foam sheet 13 base material 14 pile 15 filler 16 backing material 17 base substrate

Claims (9)

[Claims] 1. A base material comprising a base sheet material and an elastic layer substantially integrally provided on an upper surface of the base sheet material,
In an artificial turf in which a number of piles are planted so as to penetrate the base sheet material from the elastic layer side on the base material, the elastic layer is made of synthetic resin foam, and the elastic layer is heated by heating. An artificial turf characterized by at least one of a treatment and a pressure treatment. 2. The artificial structure according to claim 1, wherein at least one of the heat treatment and the pressure treatment for the elastic layer is performed before the pile is planted. grass. 3. The artificial lawn according to claim 1, wherein the synthetic resin foam constituting the elastic layer is an olefin-based crosslinked type. 4. The artificial turf according to claim 1, wherein said base sheet material is made of a woven fabric made of fiber. 5. The method according to claim 1, wherein the base material has a wide width of 1.5 m or more.
Artificial lawn according to the item. 6. A method according to claim 1, wherein a plurality of said elastic layers having a smaller width are used in parallel with said base sheet material, and end faces of said elastic layers are fusion-bonded. The artificial lawn according to any one of claims 1 to 5, wherein 7. The artificial article according to claim 1, wherein the base sheet material and the elastic layer are integrally joined by a heat-sensitive and / or pressure-sensitive adhesive. grass. 8. A base sheet material provided with an elastic layer made of a synthetic resin foam as a base material, and a number of piles are planted on the base material so as to penetrate the base sheet material from the elastic layer side. In the method for producing an artificial lawn, the base sheet material and the synthetic resin-based foam are bonded with a heat-sensitive and / or pressure-sensitive adhesive, and the synthetic resin is heated and / or pressurized when the adhesive is heated. A method for producing an artificial turf, comprising simultaneously subjecting a foam to heat and / or pressure. 9. An artificial turf base material in which a base sheet material and a synthetic resin foam as an elastic layer are integrally bonded with a heat-sensitive and / or pressure-sensitive adhesive.