JP2000352005A - Artificial lawn mat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a mat for practicing golf having favorable durability by forming an artificial lawn planted layer with a multi-filament made by twisting monofilaments of thermoplastic resin, the wear resistance characteristic value of which is equal to or larger than a prescribed value to have a predetermined number of piles. SOLUTION: An artificial lawn planted layer constituting an upper layer part and a lower layer part is a multi-filament made by twisting thermoplastic resin monofilament, the limit PV value as the wear resistance characteristic value of which is equal to or larger than 230 kgf/cm2.m/min to have the number of piles ranging from 10 to times/m. The dynamic friction coefficient of the monofilament is 0.4 or less. The thermoplastic resin is a mixed composition of 5-90 wt.% mixed polyethylene comprising 90-10 wt.% ultrahigh molecular weight polyethylene and 10-90 wt.% low molecular weight polyethylene and 95-10 wt.% aliphatic polyamide, and one or both of polyethylene contain modified polyethylene obtained by partially modifying with unsaturated carboxylic acid monomer. Thus, it is possible to obtain a shot mat with very low damage due to abrasion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an artificial turf mat having a natural turf-like cushioning property and a hitting sensation, and having excellent durability. TECHNICAL FIELD The present invention relates to an artificial turf scaffold mat and a shot mat for golf practice having excellent durability against added impact abrasion.

[0002]

2. Description of the Related Art Conventionally, as artificial turf mats for golf practice, many artificial turf mats having a bristle pile planted, adhered and fixed on a backing cloth have been developed and used. The holding performance of the golf ball close to the playing state on the turf surface, the maintenance of the sinking state, the feeling of hitting at the time of hitting, the club resilience, the swing-out property and the resistance performance to the impact abrasion with the repeatedly applied club head, and the performance The artificial turf has cushioning properties when walking and hitting, maintaining and fixing the scaffolding, breaking strength to withstand the shocking extension load applied to the artificial turf when hitting, tearing resistance, and dimensional stability (tensile elastic modulus) for extension stress. Requested,
Many attempts and developments have been made to achieve this required performance.

[0003] The performance required for the stress on the artificial turf mat during walking and swinging of a player wearing a spike is imparted to the backing cloth by using a laminated cloth woven using high-strength polyamide or high-strength polyester fiber. At the time of walking with the technology to make up and also spikes,
Alternatively, as for the provision of cushioning properties to the stance feeling during a swing, as represented in JP-A-7-39508, the flocking density, the flocking fiber pile length, the flocking fiber denier, the bending rigidity of the flocking fiber, the flocking fiber Formula,
A technique of laminating a foam having a compression elasticity according to the purpose on the back of a backing cloth in which the bristle pile is implanted, adhered, and fixed, such as the properties of the bristle pile such as the setting of the configuration content, has also been developed.

[0004] In addition, a ball holding state (floating,
In order to satisfy the original functions as a shot mat, such as a sinking state, a club swing-out property, a club impact performance at the time of hitting, a shot feeling, and the like, see JP-A-9-187.
As shown in Japanese Patent Application Publication No. 542, the combination of fibers having different performance bristle piles caused the high-denier rigid pile-forming fibers to be surrounded and held by the low-denier contractile fibers densely packed at the root of the pile. The high density denier bristle pile is constituted by a piled mat having a pile height difference, the golf ball supporting pile layer is constituted by the high denier bristle pile fiber, and the high denier bristle pile for ball supporting is prevented from falling down and hit by the low denier shrinkable fiber. The technology to manufacture mats with improved club rebound, reduced impact, and improved club swing-out performance has been developed.Furthermore, selection and improvement of the flocking method have been carried out. With the improvement of the bonding method, it is possible to provide a mat with durability as a temporary shot mat. It was.

[0005]

However, in these techniques provided, a shot mat in which metal is continuously subjected to high-speed impact friction, such as an iron, does not have sufficient impact resistance and high-speed wear performance. Insufficient durability to obtain a shot mat with satisfactory durability, beginners and advanced players have a shot feeling that can be satisfied, and a highly durable mat that satisfies the required performance of a golf practice mat is strongly demanded. . The present invention has an artificial turf mat having a cushioning property and a hitting sensation similar to a natural turf feel, and has excellent durability. An object of the present invention is to provide a golf practice mat which is durable and has excellent durability.

[0006]

Means for Solving the Problems To solve the above problems, the present invention has a high resistance to impactful high-speed repetitive friction which could not be achieved conventionally, and has all the required functions required for an artificial turf mat for golf practice. In order to obtain the flocked mat, the basic constituent requirement is that the artificial grass flocked layer has an abrasion resistance value in an artificial turf mat composed of an upper layer that is an artificial turf flocking layer and a lower layer that supports the upper layer. Limit PV value is 23
A multifilament obtained by twisting monofilaments made of a thermoplastic resin having 0 kgf / cm2 m / min or more is achieved by the multifilament having a twist number of 10 to 300 turns / m. That is,

[0007] (1) The decisive requirement for imparting a high resistance to impactful high-speed repetitive friction, which has heretofore been impossible, to an artificial turf mat for golf practice is to use fibers forming a flocking pile in the artificial turf mat. The critical PV value, which is the wear resistance characteristic value (evaluation based on JIS K7218 plastic sliding wear test method described later) 230 kgf /
cm 2 · m / min or more, preferably 270
kg / cm 2 · m / min or more, which is made of a thermoplastic resin having a high impact and high abrasion resistance and a dynamic friction coefficient of the thermoplastic resin of at least 0.4 or less, preferably 0 or less. .25. This is an essential requirement for a product having excellent impact resistance and high-speed repeated friction performance. Limit PV value 230kg
The grounds for setting f / cm2 · m / min or more as
When the limit PV value is less than 230 kgf / cm 2 · m / min, the flocking fiber produced using this resin is not much different from the abrasion resistance of conventionally known fiber products against the impact high-speed abrasion resistance of the club head upon shot. That is.

(2) Next, the pile of the artificial turf mat to be manufactured has a strong waist, does not fall down, and has an excellent ball holding state on the mat (preferable floating, sinking state, etc.); In order to satisfy the original function as a shot mat such as club impact and shot feeling, it is necessary to use 30 to 900 denier monofilaments forming a flocking pile in the mat and to ply twist at least a plurality of the filament yarns ( According to the required mat characteristics, a plurality of low-denier filament yarn bundles and a plurality of high-denier filament yarn bundles are twisted, and the two are also twisted together. This is a basic requirement for the pile yarn configuration.

(3) Then, using the above-mentioned fiber for flocking,
Optimum means and conditions from various selection conditions such as optimal flocking method, conditions, pile yarn bonding method, conditions, backing base cloth selection, cushion layer constituent material selection, properties, etc. already known as a flocking type artificial turf mat manufacturing method By making a selection and producing a flocking artificial turf mat, a product having the intended performance can be obtained. (4) Examples of the shock-resistant, high-speed abrasion-resistant thermoplastic resin having a critical PV value of 230 kgf / cm2 · m / min or more, which is a basic essential requirement of the present invention, include polyacetal resin, polyphenylene sulfide resin, and polyphenylene oxide resin. Alternatively, a blend polymer of a modified polypropylene resin and a nylon resin such as nylon 6, nylon 66, and nylon 610 can be recommended as an application object.

(5) The limit PV value is 230 kgf / c.
Examples of the thermoplastic resin having high impact wear resistance of m2 · m / min or more include a ternary mixed polymer of ultrahigh molecular weight polyethylene, low molecular weight polyethylene, and aliphatic polyamide. Further, in these three-component mixed polymers, a mixture of both polyethylenes including modified polyethylene obtained by adding a small amount of unsaturated carboxylic acid monomer to ultra-high molecular weight polyethylene and / or low molecular weight polyethylene and modifying the aliphatic polyamide is used. It may be a blended polymer. This is specifically
5 to 90% by weight (A) of a mixed polyethylene composed of 90 to 10% by weight of ultra high molecular weight polyethylene and 10 to 90% by weight of low molecular weight polyethylene;
10% by weight (B), and the ultra-high molecular weight polyethylene or the low molecular weight polyethylene is modified polyethylene partially or partially modified with a small amount of unsaturated carboxylic acid monomer. A blend polymer obtained by melt-kneading the polymer and containing it can be recommended as a particularly preferred product. The application of this blended polymer not only satisfies the requirements of the present invention, but also satisfies the requirements of the present invention, because the polymer and the obtained flocking filament yarn have a low coefficient of kinetic friction and excellent impact-resistant high-speed wear performance. Excellent mechanical properties such as strength, impact strength, flexural modulus, etc., and are the most suitable for shot mat materials used under severe conditions exposed to the intended high impact force and high-speed friction. It is.

Further, the blend polymer will be described in some detail. The blend polymer is produced as follows. First, the intrinsic viscosity (135 ° C in decalin solvent)
10 dl / g or more, preferably 15 dl / g
g or more, melting point 115 ° C. or more, density 0.92 g / cm 3
90 to 10 parts by weight of the above ultra high molecular weight polyethylene powder,
Preferably 80 to 20 parts by weight and 10 to 90 parts by weight, preferably 20 to 80 parts by weight of a low-molecular-weight polyethylene powder having an intrinsic viscosity (measured value as described above) of 0.1 dl / g, preferably 0.3 to 4 dl / g. A small amount (5% by weight based on the polyethylene)
The unsaturated carboxylic acid monomer described below) and a radical source (a radical polymerization initiator such as a peroxide type or an azonitrile type) are added, and graft polymerization or block copolymerization is performed in a solvent (suspension or solution) or under melt kneading. Polymerization is carried out to produce a modified polyethylene obtained by partially modifying the polyethylene. Here, the meaning that the amount of the unsaturated carboxylic acid monomer added is small means an amount for modifying one or both of the polyethylenes, and thereby, the artificial grass mat required by the present invention. The basic functions such as rigidity and slidability (dynamic friction) are maintained, they are well compatible with the aliphatic polyamide (B), and effectively work for micro-blending. Thus, if much of the polyethylene is modified, the microblend will improve, but the basic function will be lost. With the amount determined from the balance of both functions,
That is, it is better to aim at 5% by weight or less. The modification of the polyethylene can be performed by emitting an electron beam or radiation instead of using a radical source.

5 to 90 parts by weight, preferably 15 to 80 parts by weight, of the mixed polyethylene (A) containing the modified polyethylene thus obtained, and 95 to 95 parts by weight of the aliphatic polyamide (B)
10 parts by weight, preferably 85 to 20 parts by weight, is melt-kneaded using a melt-kneading mechanism such as a kneading extruder, extruded from a die, and cut to obtain a blend polymer. In addition,
The aliphatic polyamide used here does not need to be a special one, but a general-purpose polyamide resin, for example, nylon 6, is used in view of the requirement that the flocking fiber to be manufactured is strong and hard to fall down. Nylon 66, Nylon 610, Nylon 9, Nylon 11, Nylon 12, Nylon 6/66, Nylon 6/66/610, Nylon 6/12, Nylon 66/610, Nylon 6/11, etc. or a copolymer thereof. From inside, bending elastic modulus 200 ×
It is preferable to select and use an object of 102 kg / cm2 or more.

The purpose of modification of polyethylene with unsaturated fatty acid monomer (carbonyl modification) is to graft or block copolymerize a part of polyethylene to obtain a mixed polyethylene containing modified polyethylene, which is an aliphatic polyamide. To improve the compatibility, and to uniformly mix and disperse the mixed state of the polymer alloy (blend polymer) composed of the mixed polyethylene (A) containing the modified polyethylene and the aliphatic polyamide (B) to a microscopic level. In some cases, this dispersion greatly affects durability. Examples of the unsaturated fatty acid monomer used here include a carboxylic acid having an unsaturated double bond or a derivative thereof. Specific examples include acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, citraconic acid, corotonic acid, and nadic acid.
Examples of the derivatives include maleenyl chloride, maleimide, acrylic acid amide, methacrylic acid amide, maleic anhydride, monomethyl maleate, dimethyl maleate, glycidyl maleate, and other acid halides, esters, amides, acid anhydrides, imides, and the like. Although it is an object, maleic acid derivatives and their derivatives contribute to the improvement of durability as artificial turf, and maleic anhydride is preferable in consideration of reactivity.

Since the modification by the monomer proceeds by a radical reaction in terms of a reaction mechanism, a radical generating source is required. As described above, the source may be a radical initiator such as a peroxide or a radiation source such as an electron beam. In the case of using a radical initiator, for example, first, an ultrahigh molecular weight polyethylene and / or a low molecular weight polyethylene are suspended or dissolved in a solvent, and usually at 80 to 200 ° C in the presence of the initiator, the monomer is added with stirring. There are a wet method and a dry method in which the initiator and the monomer are sufficiently mixed and dispersed without using the solvent, and the mixture is extruded while being melt-kneaded at 180 to 300 ° C.

As described above, the mixing ratio of the mixed polyethylene (A) containing the modified polyethylene and the aliphatic polyamide (B) is 95 to 10 of the polyamide, preferably 85 to 2
0 parts by weight, whereas the mixed polyethylene is 5 to 9
0, preferably 15 to 80 parts by weight. If the mixed polyethylene (A) is less than 5 parts by weight, the effect on impact high-speed wear resistance is low. On the other hand, if it exceeds 90 parts by weight, the brittleness is particularly deteriorated, and particularly, the wear resistance and the like and the durability tend to be reduced.

In the above-mentioned mixing, one component is mainly mixed, but two or more components may be mixed. In the mixed polyethylene containing the modified polyethylene, any polyethylene is based on a single polymer of ethylene monomer, but some other monomers such as C
Copolymers with 3 or more linear α-olefins or cyclic olefins are acceptable.

(6) In the artificial turf mat of the present invention, the denier of the monofilament constituting the flocking pile is basically similar to the feeling of natural turf. 900 denier, preferably 70 to 700 denier, more preferably 1
It shall be 00 to 500 denier.

(7) The cross-sectional shape of the artificial turf mat includes the optical effect of the flocking pile (appearance such as glare), the desired holding state of the ball on the mat (preferable floating state, sinking state, etc.), and Satisfactory club swinging performance, club impact when hitting, shot feeling, etc.
In order to give the fiber's flexural rigidity (toughness, pile collapse resistance) necessary for imparting the original function as a shot mat, it has a large influence with single yarn denier and eliminates the use of circular cross-section yarn However, it is desirable to use a modified cross-section yarn. It is preferable that the cross-sectional shape of the modified cross-section yarn constituting the flocking pile is a T-shaped or cross-shaped cross-sectional shape as shown in FIG. In particular, the cross-sections having different cross-sections as shown in (c) to (f) of FIG. 1 are particularly effective because they are excellent in the reinforcing effect for preventing the pile from falling down and the effect of imparting a sense of volume in the flocking state.

(8) The monofilament, which is a constituent fiber of the artificial turf mat, is preferably formed by twisting the monofilament to form the mat.
Although it is an essential requirement for imparting the original function as a shot mat, such as satisfactory club swingability, club impact property at impact, shot feeling, etc., further setting of the denier composition of the cut pile constituent fiber and the setting of ply twist yarn conditions It is also a very important factor in determining the cushioning properties of the artificial turf mat and the function content as a shot mat. That is, in general, the suitable twist number setting range is 10 to 3 from the effect on the mat function.
00 times / m, preferably 20 to 250 times / m.
When the number of twists is less than 10, the twisting effect is not substantially obtained, and when the number is 300 or more, the spring property, that is, the impact relaxation property is lost, and the impact on the club shot becomes excessive, which is not preferable. This means that when used as a scaffold mat, there is no comfort due to lack of appropriate cushioning properties, and there is no support of the filaments between the twisted yarns, and no strength effect is produced. The effect of strength is greater when the number of twists is changed by the denier of the monofilament. When a low denier monofilament is used, the number of twists is reduced. For example, for a monofilament having a denier of 30 to 90, 10 to 100 turns /
m, and 30 to 150 times / m for a monofilament having a denier of 100 to 600.

The twisted yarn can be easily opened by simply twisting the multifilament. Therefore, it is preferable to set the twisted yarn by heat treatment after twisting. In addition, since the artificial turf mat made of crimped yarn merely obtains bulkiness and does not achieve the object of the present invention, crimped yarn is substantially excluded.

The monofilament is planted as a single yarn, but it is preferable that a plurality of monofilaments are bundled and used as a multifilament bundle yarn as the minimum unit yarn. Thereby, the strength is further improved as a twisted yarn, and the work of flocking is also improved.

(9) The flocking is preferably performed by bundling a plurality of monofilaments and using a multifilament bundling yarn as a basis.
Selection of the number of twists applied to the filament bundle, the number of plied yarns of the original filament bundle forming the multifilament bundled yarn, the combination content of the original filament bundled yarn constituting the multifilament bundled yarn, and the selection of the number of the same twisted yarns Thus, a large number of variations are possible, and a pile function to be provided by this selection can be set. For example, the following combinations can be considered assuming that the cross-sectional shapes of the monofilaments are the same. (A) A multifilament bundle yarn in which a plurality of monofilaments having the same denier are bundled, and a single yarn having the same number of twists. (B) Two or more multifilaments in which a plurality of monofilaments having the same denier are bundled. A mixed yarn of two or more multifilament bundle yarns each having a different number of twists in a bundle yarn (c) Two or more multifilament bundle yarns (one multifilament yarn) formed by bundling a plurality of monofilaments having different deniers The denier of the bundle yarn is the same)
A mixed yarn of two or more multifilament bundle yarns having the same twist number. (D) Two or more multifilament bundle yarns obtained by bundling a plurality of monofilaments having different deniers. All deniers are the same)
Mixed yarn of two or more multifilament bundle yarns each having a different twist number (e) Two or more multifilament bundle yarns in which a plurality of monofilaments having different deniers are bundled (one multifilament bundle yarn is formed. Monofilament deniers are not the same), and a mixed yarn of two or more multifilament bundle yarns each having the same twist number. (F) Two or more multifilament bundles obtained by bundling a plurality of monofilaments having different deniers. A mixed yarn of two or more multifilament bundle yarns, each having a different number of twists (g) a mixed yarn of the multifilament bundle yarns (the monofilaments constituting one multifilament bundle yarn are not the same) Double twisted yarn that further twists the yarn. The variation in the Chi filament bundle yarns conditions can also be exemplified similarly. (10) Among the above examples, the mat having the structure defined in claims 5 to 8 is preferable, and the golf ball which is held in a state in which the pile has a strong waist and the ball is floated is preferred. The sole of the club is slippery and suitable for beginner training, and the mat having the structure defined in claim 7 and claim 8 is:
Even with shots that look like doubles with little lift of the ball, the shot feeling such as the impact feeling and the swingability of the club is transmitted as such, and the function can be adjusted by selecting it, such as suitable for advanced players such as single players. (11) The flocking length depends on various factors, for example, monofilament denier, cross-sectional shape, flocking density, that is, basis weight, the number of constituent filaments, the number of twists, the mixing form, and the purpose of use of the mat (for example, for walking or shot mat). The appropriate length is different depending on whether it is for beginners or advanced users), but examples are 10 to 20 mm for shot mats and 5 to 20 mm for walking.

(12) The artificial turf mat having the function of the present invention can be manufactured using conventionally known artificial turf mat manufacturing materials and techniques, provided that the above-mentioned various constituents are set.
That is, the artificial turf mat composed of an upper layer portion which is an artificial turf flocking layer and a lower layer portion supporting the upper layer portion was manufactured using a polymer for fiber constitution such as tetron or nylon specified in the present invention. The fiber bundle for forming a pile is used as an upper layer portion, and a backing base cloth is generally used as a lower layer portion supporting the upper layer portion under a commonly used flocking device and flocking conditions. Is tufted and planted, and backed with a commonly known backing agent (synthetic rubber latex, synthetic resin emulsion adhesive, etc.), dried and adhesively fixed with a flocking pile, and a general-purpose well-known method capable of imparting desired compression elasticity to the back surface Adhere foam cushion material. The lower layer is made of a non-elastic material in addition to the above sheet-like elastic material depending on the purpose of use.

The golf practice mat is difficult to avoid damage to the base fabric due to tufting of thick bristle fibers, and even if it is not a shot mat to which a shocking high-speed friction force is repeatedly applied at the time of a shot, a spike is attached to a walking mat. Since it is an object to which a shocking displacement force is applied when walking with shoes and shots, consideration should be given to selecting and using a backing base fabric with high tensile strength, high impact strength, high tensile elastic modulus, and high tear strength It is important to do. Therefore, instead of the base fabric such as nylon, the mixed composition according to claim 3 can be spun into a textile fiber, woven, and used as a base fabric. Unlike the base cloth of Tetron, nylon, etc., the base cloth by this is very high in strength, and as a result, the support member itself as a lower layer part can be protected, and the service life as a whole is preferably increased.

(13) The multifilament yarn constituting the artificial turf mat of the present invention is composed of a twisted yarn obtained by twisting a plurality of monofilaments. As shown in FIG. 2, S twisting and Z twisting are used in the twisting method. And any of the twists may be used, but the S twist is preferred. However, in the case of the double twisted yarn of claim 8, it is better to apply not only S twist but also Z twist.

(14) The artificial turf flocking layer has a limit PV value, which is a wear resistance characteristic value, of 230 kgf / cm 2 · m
Hybridization of a monofilament made of a thermoplastic resin of less than / min is permissible, but should not impair the object of the present invention.

(15) The artificial turf is generally colored green, but the means for this is not limited. Generally, it is performed by coloring nylon in advance with an organic pigment and adding a small amount of this as a master batch.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The content of the present invention will be described more specifically and in detail in the following examples. Example 1 75 wt% of ultrahigh molecular weight polyethylene having an intrinsic viscosity [η] = 21 dl / g and an intrinsic viscosity [η] = 1.5
1 wt% (based on the mixed powder) of maleic anhydride was mixed with a mixed powder of dl / g of 25% by weight of low molecular weight polyethylene, and a small amount of a polymerization initiator was added thereto to carry out graft polymerization. 80% by weight of nylon 6 powder (relative viscosity = 3.2) to 20% by weight of a mixed powder containing both components containing modified polyethylene
Was mixed to obtain a mixed nylon powder. To color it, 3% by weight of green colored nylon 6 resin for masterbatch containing a weathering agent and a heat stabilizer was added and mixed.
In order to further mix the mixture, a small amount of the mixture of the stabilizer was supplied to a twin-screw kneading extruder, and the mixture was kneaded and melted (180 to 260
C.), extruded through a die, and cut to obtain pellets for flocking pile yarn production.

Limit P of the polymer for producing flocking pile yarn
The V value was 300 kgf / cm 2 · m / min. The dried flocking pile yarn production pellets are supplied to a screw extruder of a melt spinning apparatus equipped with a spinning nozzle having a four-hole deformed cross-shaped orifice as shown in FIG. Single-hole extrusion at ℃ = 2
Extruded at 25g / min.hole (total extrusion amount = 900g / min),
Take-up speed = 1,500m / min, winding up at 5400d
/ F × 4 unstretched yarn, and then heat-stretched at 120 ° C. with a draw ratio of 3 times to obtain a 1,800 d. /
A multifilament (C) having 4f (denier 450 d / f) was obtained.

Next, 100 is added to the multifilament (C).
Times / m S twist, 5 multifilament bundles with this S twist are combined, and 100 times / m Z twist are applied.
Heat treated at 80 ° C for 12 hours, set the twist, 9,000d
A / 20f multifilament bundle (D) was produced. This is called an SZ yarn. Next, the SZ yarn of the multifilament bundle (D) was piled at a density of 2.62 Kg / m2 on a polyester base cloth which was placed on a tufting machine.
Multifilament bundle (D) knitted in a loop in the vertical direction so that
Between the loops of the SZ yarns, in a direction perpendicular to the tufting direction (transverse direction), drive a multifilament yarn of 500d polyester separately prepared to prevent the detachment of a cut pile described later. A tufted product in which the multifilament bundle (D) was woven in a ridge shape in the vertical direction was produced.

The two-piece tufted product was cut and sliced at the center in the thickness direction of the base fabric to obtain a sheet on which a multifilament bundle (D) having a cut pile length of 15 mm was planted. Next, a vinyl acetate emulsion adhesive was applied to the back surface of the flocking sheet, dried, adhered so that the cut pile did not fall off, and a two-part epoxy adhesive was further applied to obtain a 10 mm thick (Shore hardness 30). ) An intended artificial turf mat having a foam rubber sheet adhered thereto and a cushion layer also adhered thereto was produced. The type of adhesive used here,
Neither the material, thickness, hardness, etc. of the foamed rubber sheet, such as the prescription, are specified.

Table 1 shows the results obtained when ten beginner monitors evaluated the durability of the artificial turf mat as a friction durability and the performance as a golf practice shot mat.

This is done by 10 amateurs (Handy 10-36)
Of the club), the ball does not sink (completely floating) compared to the mat that is generally used, so it can be caught in the club and fly at a satisfactory distance. It was an opinion that it was ball. The overall judgment was a highly durable mat that was excellent as a practice shot mat.

Example 2 The pellets for producing flocking pile yarn produced in Example 1 were used, and the orifice shape was changed to that of Example 1.
It has the same deformed cross shape as
A nozzle having six holes was attached, and melt spinning was performed under the following spinning conditions. That is, the extrusion temperature is 255 ° C., the single-hole extrusion amount is 25 g / min. / Hole (the total extrusion amount is 900 g / min),
Melt spinning at take-off speed = 1,500 m / min.
An undrawn yarn of 00d / 36f (single yarn denier 150d / f) was obtained. Next, as in Example 1, hot stretching was performed at 120 ° C. with a stretching ratio of 3 times, and the cross-sectional shape was 1,800.
A multifilament (E) having a d./36f (a single yarn denier of 50 d / f) was obtained.

Then, the multifilament (E) was subjected to S-twisting at 30 turns / m to produce a multifilament, and three multifilaments were produced to produce a multifilament bundle (F). In addition, a multifilament obtained by applying 100 times / m of S twist to a multifilament (C) having a cross-sectional shape of 1,800 d / 4f (single denier 450 d / f) formed in Example 1 separately was manufactured. Then, a multifilament bundle (G) was prepared by tying the two filaments. Next, the multifilament bundle (F) and the multifilament bundle (G) were combined, Z-twisted at 30 times / m, heat-treated at 80 ° C. for 12 hours, and twisted, and the total denier was set at 9,000 d / 1.
A 16f multifilament bundle (H) was produced. The resulting yarn is called a mixed SZ yarn.

Using the multifilament bundle (H) of the mixed SZ yarn, tufting, backing (adhesion and fixing of pile), and cushion layer sticking were performed on a polyester base fabric in the same manner as in Example 1. Processing was performed to obtain an artificial turf mat on which a multifilament bundle (I) having a cut pile length of 15 mm was planted. Table 1 shows the results of evaluation of the friction durability, dynamic friction coefficient, and performance as a golf practice shot mat of this artificial turf mat by a single-handy monitor of 10 persons. This was the opinion that the sinking of the ball was closer to the natural fairway compared to the mats generally used, and that iron shots could be made with a practical feeling. On the other hand, even a slight mistake (Dafuri) shot showed a clear difference in the flight distance. This is a very suitable mat because it is easy for advanced users to judge a missed shot. Furthermore, when used as a foot mat and a walking mat for golf shot practice as a scaffolding mat, the former can firmly stance with a comfortable feel and can take a comfortable iron shot, and the latter can walk on a natural fairway. I did not feel tired with my senses. As a comprehensive judgment, it was a durable mat that was excellent as a practice shot mat for advanced users.

[Comparative Example 1] Spinning (with a spinneret temperature of 29) according to the procedure of Example 1 except that the raw material for the pile constituting fiber in Example 1 was changed to only nylon 66 (relative viscosity 3.5).
(0 ° C.) to obtain a nylon 66 multifilament (1820 d / 4) having a single yarn denier of 455 d / f. And 100 times / m of S twist was applied to this, and this S
Five twisted multifilament bundles are combined and 100
Twist / m Z twist, heat treatment at 80 ° C. × 12 hours to set twist, and 15 mm flocking (pile density 3.02 kg / m 2) under exactly the same manufacturing conditions except for multifilament of 9,100 d / 20 f An artificial turf mat having the following was prepared. Table 1 shows the results of evaluation of the friction durability, dynamic friction coefficient, and performance as a golf practice shot mat of the artificial turf mat by ten amateur monitors. When a shot test of a golf ball by 10 players was attempted, the ball tended to sink compared to Example 1,
The impact on the flight distance at the time of duffling was great, and there was no difference from the conventional nylon golf mat. He also felt that he felt strong swing resistance. As a comprehensive judgment, the durability was insufficient, and the shot mat for practice was insufficient.

The limiting PV value, dynamic friction coefficient and durability against friction of these artificial turf mats were evaluated as follows. (1) Limit PV value, dynamic friction coefficient According to JIS K7218, it was measured with a Matsubara friction and wear tester (manufactured by Toyo Baldwin Co., Ltd.) under the following conditions, and determined by the following equation. A. Condition Load: 5 kg · f to 50 kg · f (5 kg · f increments of 30
Minute same load) Speed: 12m / min (v) Time: 168Hr Counterpart material: SUS304 Shape: inner diameter 20φ, outer diameter 25.6φ cylinder Sliding area: 2cm2 Roughness of sliding area: equivalent to 6s (average roughness 0. 8μ) Sample: Sheet B. Calculation Limit PV value = Measurement is continued under the above conditions, and P × V at which normal frictional movement cannot be continued is calculated (unit: kgf / cm
2 · m / min) Dynamic friction coefficient = Dynamic friction force at load of 15 kg · f / load 15
kg ・ f (2) Abrasion resistance and durability The abrasion tester shown in FIG. 3 was used to measure the abrasion for a pressing depth (depth of penetration into the flocking pile) of 10 mm, a rotational speed of 240 rpm and a wear test duration of 500 hours. The wear reduction length by the wear test with respect to the flocking length before the test (the length from the backing base fabric surface) was evaluated by%. In the schematic diagram of the abrasion tester shown in FIG. 3, reference numeral 7 denotes a rotating wing which rotates with a rotating trajectory having a diameter of 140 mmφ, and is composed of four blades 7a (made of SUS304) provided in a windmill shape. Feather 7
The size of the surface of a is 40 × 70 mm, and the surface is
10 mm into the flocked layer. The edge of the blade 7a is 1 mmR. The rotary blade 7 is structured to be driven by a drive motor via a chain. Reference numeral 8 denotes a vertically movable test piece fixing table.

[0039]

As described above, the present invention improves the abrasion resistance of a golf practice mat subjected to a constant and repeated high impact frictional load, and provides a desirable holding state of a ball on the mat as a shot mat. A mat with advanced functions as a shot mat, such as satisfactory club swing-out properties, club impact when hitting, shot feeling, etc., was obtained.
The selection of the raw material resin for the flocking cut pile yarn constituting fiber of the artificial turf mat has been advanced, and it is not limited to the use of synthetic fibers manufactured from general-purpose polymers as in the past, especially the low dynamic friction coefficient, high bending rigidity, Because we selected a resin with excellent abrasion properties to make up the fibers constituting the flocking pile, the shot mat for golf practice was excellent in swinging out the club, and shots with extremely little wear damage against repeated club hits Mat could be provided.

Further, in the present invention, the artificial turf mat is constructed by devising the constitution of the flocking cut pile constituting fiber, that is, the denier constitution, the state of the twisted yarn, etc., so that the cut pile is given an appropriate bending rigidity, It can provide the performance of preventing falling down due to the load of the ball, the desirable holding state of the ball on the mat as a shot mat, and the satisfactory club swinging property, club impact property at impact, shot feeling, etc. A high-grade function as a mat can be provided, and an excellent artificial grass mat for golf practice can be provided.

[Brief description of the drawings]

1 is a cross-sectional view of a modified cross-section yarn of the present invention, wherein (a) is a T-shape, (b) is a modified T-shape, (c) is a vertically long cross,
(D) is an example of a horizontally long cross-shaped yarn, and (e) and (f) are examples of a modified cross-shaped yarn.

FIG. 2 is a schematic diagram showing a twisted state of a multifilament.

FIG. 3 is a schematic view of a wear tester.

[Explanation of symbols]

 7: Rotating wing 7a: Blade 8: Test piece fixing base 9: Rotating wing drive motor 9a: Power transmission chain 10: Test specimen

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[Procedure amendment]

[Submission date] April 12, 1999 (1999.4.1
2)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0037

[Correction method] Change

[Correction contents]

[Comparative Example 1] Spinning (with a spinneret temperature of 29) according to the procedure of Example 1 except that the raw material for the pile constituting fiber in Example 1 was changed to only nylon 66 (relative viscosity 3.5).
(0 ° C.) to obtain a nylon 66 multifilament (1820 d / 4) having a single yarn denier of 455 d / f. And 100 times / m of S twist was applied to this, and this S
Five twisted multifilament bundles are combined and 100
Twist / m Z twist, heat treatment at 80 ° C. × 12 hours to set twist, and 15 mm flocking (pile density 3.02 kg / m 2) under exactly the same manufacturing conditions except for multifilament of 9,100 d / 20 f An artificial turf mat having the following was prepared. Table 1 shows the results of evaluation of the friction durability, dynamic friction coefficient, and performance as a golf practice shot mat of the artificial turf mat by ten amateur monitors. When a shot test of a golf ball by 10 players was attempted, the ball tended to sink compared to Example 1,
The impact on the flight distance at the time of duffling was great, and there was no difference from the conventional nylon golf mat. He also felt that he felt strong swing resistance. As a comprehensive judgment, the durability was insufficient, and the shot mat for practice was insufficient.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) D02G 3/26 D02G 3/26 (72) Inventor Hirofumi Yanagisawa 163 Morikawahara-cho, Moriyama-shi, Shiga Gunze Co., Ltd. (72) Inventor Noriharu Muraoka 1-2-2 Waki, Waki-machi, Kuga-gun, Yamaguchi Prefecture F-term (reference) 2D051 HA04 HA05 4J002 BB03W BB03X BB21W BB21X BN05W BN05X BP03W BP03X CL01Y CL03Y CL05Y GA00 GC00 GK01 4L035 AA09 BB32 BB33 BB40 BB89 BB91 DD02 DD14 EE08 FF01 LC02 LC08 4L036 MA04 MA06 MA34 PA21 PA47 UA08

Claims (9)

[Claims] 1. An artificial turf mat comprising an upper layer portion which is an artificial turf flocking layer and a lower layer portion supporting the upper layer portion, wherein the artificial turf flocking layer has a limit PV value of 230 which is a wear resistance characteristic value.
It is composed of a multifilament obtained by twisting monofilaments made of a thermoplastic resin having a weight of not less than kgf / cm 2 · m / min.
An artificial turf mat having the number of twists. 2. The artificial turf flocking layer has a dynamic friction coefficient of 0.4.
The artificial turf mat according to claim 1, comprising a monofilament made of a thermoplastic resin, preferably 0.25. 3. The thermoplastic resin comprises ultra-high molecular weight polyethylene 90 to 10% by weight and low molecular weight polyethylene 10 to 10% by weight.
A mixed composition of 5 to 90% by weight of a mixed polyethylene consisting of 90% by weight and 95 to 10% by weight of an aliphatic polyamide, wherein the ultra high molecular weight polyethylene or the low molecular weight polyethylene is one or both of them; The artificial turf mat according to claim 2, wherein the modified turf mat contains a modified polyethylene partially modified with a small amount of an unsaturated carboxylic acid monomer. 4. The artificial turf mat according to claim 1, wherein the monofilament is formed of a modified yarn having a denier of 30 to 900. 5. The artificial turf mat according to claim 4, wherein the cross-sectional shape of the irregular cross-section yarn has a cross-sectional shape of T or cross in which at least one side has a length different from the length of the other side. 6. The multifilament yarn constituting the artificial turf mat is a multifilament bundle yarn comprising a plurality of monofilaments of 100 to 600 denier and a twist of 30 to 150 times / m. Item 6. The artificial turf mat according to any one of Items 4. 7. The multifilament yarn constituting the artificial turf mat includes a multifilament bundle-shaped yarn composed of a plurality of monofilaments of 100 to 600 deniers, twisted yarns of 30 to 150 turns / m, and a multifilament bundle yarn of 30 to 90 deniers. The artificial turf mat according to any one of claims 1 to 4, wherein the artificial turf mat is a mixed twisted yarn with a multifilament bundled yarn composed of a plurality of monofilaments and twisted at a rate of 10 to 100 turns / m. 8. The mixed twisted yarn may further be 10 to 100 times /
The artificial turf mat according to claim 7, which is a double twisted yarn formed by twisting with a number of twists of m. 9. The artificial turf mat according to claim 1, wherein the artificial turf mat is configured as a golf practice scaffolding mat or a shot mat.