WO2020130647A1

WO2020130647A1 - Protective net for sports , and golf protective net, soccer protective net, baseball protective net, tennis protective net, and volleyball protective net using same

Info

Publication number: WO2020130647A1
Application number: PCT/KR2019/018036
Authority: WO
Inventors: 김상환
Original assignee: 코오롱인더스트리 주식회사
Priority date: 2018-12-19
Filing date: 2019-12-18
Publication date: 2020-06-25
Also published as: JP2022507071A

Abstract

The present invention is characterized that synthetic fiber cords (Chord) having a form in which a plurality of synthetic fiber filaments are plied and twisted are crossed to each other in a knotless type (Knotless type) to form mesh (Mesh) between intersection points of the synthetic fiber cords (Chord), wherein the diameter (d) of the synthetic fiber cord (Chord) satisfies equation (I) below, and the maximum distance (D1) between the intersections adjacent to each other satisfies equation (II) below, and the minimum distance (D2) between the intersections adjacent to each other satisfies equation (III) below. The present invention has a lower surface density compared to conventional protective nets for sports. That is, the present invention has a lighter weight. The present invention has a smaller diameter of the synthetic fiber chords constituting a protective net, which increases porosity, thereby improving wind resistance when manufacturing a protective net structure. The present invention has excellent mechanical properties, and thus has excellent resistance to an impact applied when a ball hits and strikes. Therefore, the present invention is damaged less easily and has longer replacement cycles . In addition, the present invention has high porosity, thus improving visibility, and yet can effectively prevent the ball from penetrating the mesh , so as to improve stability. In addition, the present invention can be easily mounted on a protective net structure, and has excellent flame retardancy and weather resistance.

Description

Sports protective net, golf protective net using the same, soccer protective net, baseball protective net, tennis protective net, and volleyball protective net

The present invention is installed on a golf course or a baseball field, a protective net for sports that prevents a hitting golf ball or a baseball ball from escaping out of the protective net, a protective net for golf using this, a protective net for soccer, a protective net for baseball, tennis A protective net for volleyball and a protective net for volleyball. Specifically, it is lightweight and has excellent resistance to wind, yet has excellent impact resistance and has a long replacement cycle, and has excellent visibility with high porosity, while a golf ball or baseball ball is a protective net. It is effectively prevented from penetrating out, and the stability is improved, and the flame retardant and weather resistance are excellent for sports protective nets, golf protective nets using this, soccer protective nets, baseball protective nets, tennis protective nets, and volleyball protective nets. It is about.

The protective net for sports is installed in a golf course or a baseball field, and is used to prevent a hitting golf ball or a baseball ball from escaping out of the protective net.

In the conventional sports protective net, a plurality of high density polyethylene (hereinafter referred to as "HDPE") filaments are knotted or knotted with HDPE cords (Chords) in the form of plying and twisting. A protective net for sports, which forms a mesh between crossing points of the HDPE codes while intersecting each other in a knotless type, has been mainly used.

However, in order to achieve a desired level of impact resistance and wear resistance in the conventional sports protective net, the diameter of the HDPE cord (Chord) had to be set to be larger than at least 1.8 mm, thereby increasing the surface density of the sports protective net against wind. There is a problem that it is easily damaged by wind after installation due to its weak resistance, and it takes a lot of time and manpower to remove the protective net.

In addition, the conventional protection net for sports is easy to break due to the low resistance to the impact that the hitting golf ball hits and hits, and the area of FIG. 3 is divided by the area B of FIG. 3 and multiplied by 100 to calculate the porosity (% ) Had a problem of low visibility.

In addition, the conventional protective net for sports has a problem of poor flame resistance and weather resistance.

The subject of the present invention is lightweight, excellent in wind resistance, excellent in shock resistance, long replacement cycle, excellent visibility with high porosity, while effectively preventing golf ball or baseball ball from penetrating out of the protection net, improving stability. , To provide a flame retardant and weather resistance excellent sports protective net, golf protective net using the same, soccer protective net, baseball protective net, tennis protective net, and volleyball protective net.

In order to solve this problem, a plurality of synthetic fiber filaments having a synthetic and twisted synthetic fiber cords (Chords) cross each other in a knotless type of a knotless type (Knotless type) crossing point of the synthetic fiber cords (Chords) Meshes are formed between the fields, and the diameter (d) of the synthetic fiber cord (Chord) satisfies the following equation (I), and the maximum distance (D1) between the intersection points adjacent to each other is the following equation (II) It satisfies, and the minimum distance (D2) between the intersections adjacent to each other to manufacture a protective net for sports satisfying the following formula (III).

The unit of each of the maximum distance (D1) and the minimum distance (D2) between the diameter (d) of the synthetic fiber cord (Chord) obtained by the formulas (I) to (III) and the adjacent intersections is mm, and m is The mass of the ball, N is the constant 14.14214, ε is the elongation of the synthetic fiber filament material, θ is the ball's strike angle, σ is the stress of the synthetic fiber filament material, Vo is the maximum velocity of the blown ball, L Is the total length of the net impacted by the blown ball, obtained by the following formula (IV), h is the height of the net impacted by the hitted ball, obtained by the following formula (V), and R is the blow Paper is the radius of the ball, n is the number of twists applied to the synthetic fiber filaments for the manufacture of synthetic fiber cords,

In the above formula (IV), N2 is an integer of 12, 17 or 24 as the number of intervals (D) between the intersections of the nets impacted by the striking ball, and N1 is a synthetic fiber cord that is impacted by the ball The number of intersections of 1, 2 or 4 integers,

In the formula (V), Vo is the initial velocity of the hitting ball, and θ is the hitting angle of the ball.

In the above formula (IV), N2 is the maximum value of the diameter (d) of the synthetic fiber cord according to the formula (I), according to the number value of the intervals (D) between the intersections of the nets impacted by the hitted ball. And a minimum value can be obtained.

The present invention has a lower surface density than conventional protective nets for sports, that is, lighter weight, and the diameter of the synthetic fiber cords constituting the protective net is considerably smaller than the diameter of the HDPE cords of conventional protective nets. When constructing a structure, the resistance to wind is improved, and the mechanical properties are excellent, so it is excellent in resistance to the impact applied when a golf ball or a baseball ball flies and strikes. Therefore, the present invention minimizes damage and extends the replacement cycle.

In addition, the present invention has a high porosity, improves visibility, and can effectively prevent a golf ball or a baseball ball from penetrating between meshes, thereby improving stability.

In addition, the present invention can be easily mounted on a protective net structure, and has excellent flame retardancy and weather resistance.

1 is a plan view of a portion of a protective net for sports.

FIG. 2 is an enlarged photograph of an intersection X of synthetic fiber codes (Chord: C) in FIG. 1.

3 is a schematic diagram showing areas A and B used for porosity calculation.

4 to 6 is a schematic diagram showing the number (D) of the distance (D) between the intersection points of the net impacted by the ball according to the location where the ball hits the protective net.

Hereinafter, the present invention will be described in detail through the accompanying drawings.

The present invention, as shown in Figures 1 and 2, a plurality of synthetic fiber filaments synthetic fiber cords (Chords) in the form of plied and twisted are crossing each other in a knotless type of knotless type (synthetic fiber cord) Meshes are formed between the intersections of (Chords), the diameter (d) of the synthetic fiber cord (Chord) satisfies the following formula (I), and the maximum distance (D1) between the intersections adjacent to each other is It is characterized in that the following equation (II) is satisfied and the minimum distance (D2) between the intersection points adjacent to each other satisfies the following equation (III).

The number (N2) of the intervals (D) between the intersections that are impacted by the striking ball is determined according to the position where the ball collides with the protective net as shown in FIGS. 4 to 6.

Specifically, when the ball collides with the position of the protective net shown in FIG. 4, the number N2 of the intervals D between the intersection points that are impacted by the hitting ball becomes 12, and the ball is impacted by the hitting ball. The number of intersections (N1) is one.

On the other hand, when the ball collides with the position of the protective net shown in FIG. 5, the number of gaps (D) between the intersections (D) between the intersections impacted by the hitting ball becomes 17, and the intersection impacted by the hitting ball The number N1 is two.

On the other hand, when the ball collides with the position of the protection net shown in FIG. 6, the number of gaps D between the intersection points (N2) is 24, and the number of intersections N1 that are impacted by the hitting ball is 4. .

The protective net for sports of the present invention may be used as a protective net for golf, a protective net for soccer, a protective net for baseball, a protective net for tennis or a protective net for volleyball.

As the synthetic fiber filaments constituting the synthetic fiber cord, aramid filaments may be used alone, or other synthetic fiber filaments other than aramid filaments and aramid filaments may be used.

When the present invention, wherein the synthetic fiber cord is an aramid cord made of aramid filaments, is used as a protective net for golf, the diameter (d) of the aramid cord is 0.85 mm or more and 1.5 mm or less, and the maximum distance (D1) of intersections adjacent to each other is It is preferably 35 mm or less, and the minimum distance D2 of intersection points adjacent to each other is 20 mm or more.

When the present invention, in which the synthetic fiber cord is an aramid cord made of aramid filaments, is used as a protective net for soccer, the diameter (d) of the aramid cord is 0.59 mm or more and 0.84 mm or less, and the maximum distance (D1) of intersections adjacent to each other is It is preferably 140 mm or less, and the minimum distance D2 of intersection points adjacent to each other is 135 mm or more.

When the present invention, in which the synthetic fiber cord is an aramid cord made of aramid filaments, is used as a protective net for baseball, the diameter (d) of the aramid cord is 0.75 mm or more and 1.07 mm or less, and the maximum distance (D1) of intersections adjacent to each other is It is preferably 50 mm or less, and a minimum distance D2 of intersection points adjacent to each other is 40 mm or more.

When the synthetic fiber cord is used as the protective net for tennis of the present invention, the diameter (d) of the synthetic fiber cord is 0.73 mm or more and 1.03 mm or less, and the maximum distance (D1) of the intersection points adjacent to each other is 42 mm or less, and the intersection points adjacent to each other It is preferable that the minimum spacing D2 of them is 38 mm or more.

When the synthetic fiber cord is used as a protective net for volleyball of the present invention, the diameter (d) of the synthetic fiber cord is 0.33 mm or more and 0.47 mm or less, and the maximum distance (D1) of the intersection points adjacent to each other is 126 mm or less, and the intersection points adjacent to each other It is preferable that the minimum spacing D2 of the particles is 122 mm or more.

If the diameter (d) of the synthetic fiber cord is lower than the above range, mechanical properties such as tensile strength and abrasion resistance of the synthetic fiber cord are deteriorated, thereby protecting sports for the impact caused by impact of a hitting golf ball or baseball ball. If the net is more likely to break easily, and the diameter (d) of the synthetic fiber cord exceeds the above range, the surface density of the protective net for sports becomes heavier than 180 g/m2 and the net diameter increases, resulting in external environment such as wind and typhoon. Since the resistance to damage is lowered, the installed protective net is more likely to be easily damaged, and the porosity of the sports protective net is lowered to less than 88%, making viewing performance uncomfortable.

When the distance between the crossing points (X) of the synthetic fiber cords exceeds the above range, a problem such as a golf ball or a baseball ball penetrating between the meshes of a sports protective net is deteriorated. If it occurs, and if it is less than the above range, the mesh is formed too small, which makes viewing of the game uncomfortable.

That is, the diameter (d) of the synthetic fiber cord (Chord) is 0.85 mm or more and 1.5 mm or less, the maximum distance (D1) of the intersection points adjacent to each other is 35 mm or less, and the minimum distance (D2) of the intersection points adjacent to each other is 20 mm or more A protective net for sports characterized in that it can be used as a protective net for golf.

In addition, the diameter (d) of the synthetic fiber cord (Chord) is 0.59 mm or more and 0.84 mm or less, the maximum distance (D1) of intersections adjacent to each other is 140 mm or less, and the minimum distance (D2) of intersections adjacent to each other is 135 mm or more A sports protective net characterized in that it can be used as a protective net for football.

In addition, the diameter (d) of the synthetic fiber cord (Chord) is 0.75 mm or more and 1.07 mm or less, the maximum distance (D1) of intersection points adjacent to each other is 50 mm or less, and the minimum distance (D2) of intersection points adjacent to each other is 40 mm or more. A protective net for sports characterized in that it can be used as a protective net for baseball.

In addition, the diameter (d) of the synthetic fiber cord (Chord) is 0.73 mm or more and 1.03 mm or less, the maximum distance (D1) of intersection points adjacent to each other is 42 mm or less, and the minimum distance (D2) of intersection points adjacent to each other is 38 mm or more. A sports protective net characterized in that it can be used as a protective net for tennis.

In addition, the diameter (d) of the synthetic fiber cord (Chord) is 0.33 mm or more and 0.47 mm or less, the maximum distance (D1) of intersections adjacent to each other is 126 mm or less, and the minimum distance (D2) of intersections adjacent to each other is 122 mm or more A sports protective net characterized in that it can be used as a protective net for volleyball.

The aramid cord (Chord: C) is composed of two or more and three strands of aramid filaments having a fineness of 1,200 denier or more and 5,000 denier or less, more preferably 2,000 or more and 5,000 denier or less, and the elongation of the aramid filament is 2% or more and 4% or more. It is preferable that it is the following.

It is more preferable to improve the weather resistance that a resin containing an ultraviolet stabilizer is coated on the synthetic fiber cord.

The protective net for sports of the present invention has a cutting strength of 114daN or more, or 114daN or more and 120daN or less, and a thin fabric may be sewn at the end of the sports protective net to improve the mountability during installation.

As an example of implementation, when cutting or mounting a Knotless type protection net, a narrow fabric is sewn at the end of the protection net to prevent the loosening of the protection net from occurring.

As another implementation example, a metal ring jig may be mounted when a narrow fabric is sewn into the end of the protection net in order to easily mount or mount the protection net on a pillar for installation of the protection net.

As another example of implementation, when a velcro is attached to a pillar for installation of a protection net, when the narrow fabric is sewn into the end of the protection net to improve the fit and detachability of the protection net, the velcro may be sewn together.

The present invention has a lower surface density than conventional protective nets for sports, that is, lighter weight, and the diameter of the synthetic fiber cords constituting the protective nets is significantly smaller than that of the conventional HDPE cords, so that the porosity increases, which is why it is desirable in the manufacture of protective net structures. It has improved resistance and excellent mechanical properties, so it is excellent in resistance to impact applied when a golf ball or a baseball ball flies and strikes. Therefore, the present invention minimizes damage and extends the replacement cycle.

Specifically, the porosity of the sports protective net according to the following formula (VI) may be 90% or more, or 90% or more and 100% or less, or 90% or more and 99.5% or less.

In the above formula (VI), A is the area of the mesh, and B is the horizontal length (ℓ2) of the mesh (ℓ2) plus the aramid code (chord) diameter (d) (ℓ1) and the mesh (mesh) It is the area obtained by multiplying the length (h2) of the length by adding the aramid cord diameter (d) to the value (h1).

In addition, after attaching the protective net for sports to a rotational friction force tester, abrasion resistance, which is the time required for damage to the protective net by contacting a golf ball rotating at 3,000 rpm to the same portion of the protective net, is 20 minutes or longer, or 20 minutes or longer. It can be 35 minutes or less.

Further, the surface density of the protective net for sports may be 1 g/m 2 or more and 100 g/m 2 or less, or 5 g/m 2 or more and 80 g/m 2 or less.

In addition, the present invention has a high porosity, improves visibility, but also effectively prevents a golf ball or a baseball ball from penetrating between meshes, thereby improving stability.

Hereinafter, the present invention will be described in more detail through Examples and Comparative Examples.

However, the scope of the present invention should not be construed as being limited to the following examples.

Example 1

2 aramid filaments having an elongation of 3% and a fineness of 4,500 denier were combined and twisted to prepare an aramid cord (Chord) having a diameter (d) of 0.95 mm.

Next, the meshes were formed while crossing each other in a knotless type without knots as shown in FIGS. 1 and 2 to manufacture a protective net for golf.

At this time, the distance between the crossing points (X) of the aramid codes was adjusted to 25 mm.

Table 1 shows the results of evaluating the cutting strength, surface density, porosity, and wear resistance of the manufactured golf protective net.

Comparative Example 1

Aramid cord (Chord) having a diameter (d) of 0.8 mm was prepared by plying and twisting two 3,000 denier aramid filaments.

At this time, the distance between the crossing points (X) of the aramid codes was adjusted to 23 mm.

Comparative Example 2

Five strands of 3,000 denier high-density polyethylene (HDPE) filaments were plied and twisted to produce HDPE cords having a diameter (d) of 1.40 mm.

Next, meshes were formed while crossing the HDPE codes in a knotless type without knots as shown in FIGS. 1 and 2 to manufacture a protective net for golf.

At this time, the distance between the crossing points (X) of the HDPE codes was adjusted to 23 mm.

In Table 1, the values of Formula (I), Formula (II), and Formula (III) are as follows.

As shown in Table 1, unlike the golf protective net manufactured in Example 1, the distance between the intersections (X) does not fall within the range of Equation (II) and Equation (III). It was confirmed that the wear protection net had a significantly poor wear resistance.

In addition, unlike the golf protective net produced in Example 1, the code diameter not only does not satisfy the formula (I), but also the golf protective net produced in Comparative Example 2 in which the code material is changed to HDPE, has abrasion resistance and cutting strength. It was remarkably poor, and it was possible to confirm the load.

Example 2

Aramid cord (Chord) having a diameter of 0.7 mm was produced by plying and twisting two strands of 3,000 denier aramid filaments.

Next, as shown in FIGS. 1 and 2, the mesh nets were formed while crossing each other in a knotless type without a knot to prepare a protective net for soccer.

At this time, the distance between the crossing points (X) of the aramid codes was adjusted to 137 mm.

Table 2 shows the results of evaluating the cut strength, surface density, porosity, and wear resistance of the manufactured soccer protective net.

Example 3

Aramid cord (Chord) having a diameter of 0.9 mm was prepared by plying and twisting two strands of 3,000 denier aramid filaments.

Next, as shown in FIGS. 1 and 2, mesh nets were formed while crossing each other in a knotless type without a knot, thereby manufacturing a protective net for baseball.

At this time, the interval between the crossing points (X) of the aramid codes was adjusted to 45 mm.

Table 2 shows the results of evaluating the cutting strength, surface density, porosity, and wear resistance of the manufactured baseball protective net.

Example 4

Two strands of 3,000 denier aramid filaments were plied and twisted to prepare an aramid cord (Chord) having a diameter of 0.85 mm.

Next, as shown in FIGS. 1 and 2, the mesh nets were formed while crossing each other in a knotless type without a knot to prepare a protective net for tennis.

At this time, the distance between the crossing points (X) of the aramid codes was adjusted to 40 mm.

Table 2 shows the results of evaluating the cut strength, surface density, porosity, and wear resistance of the manufactured tennis protective net.

Example 5

Aramid cord (Chord) having a diameter of 0.4 mm was produced by plying and twisting two strands of 3,000 denier aramid filaments.

Next, as shown in FIGS. 1 and 2, the meshes were formed while crossing each other in a knotless type without a knot to prepare a protective net for volleyball.

At this time, the distance between the crossing points (X) of the aramid codes was adjusted to 124 mm.

Table 2 shows the results of evaluating the cut strength, surface density, porosity, and wear resistance of the manufactured volleyball protective net.

The properties of <Table 1> and <Table 2> were evaluated by the following method.

Cutting strength (daN)

KS K ISO 1806, the mesh-measurement of the mesh was measured by the method of measuring the mesh cutting force, the mesh was collected, fixed at both ends, and the cutting strength was measured.

Porosity (%)

As shown in Fig. 3, (i) the area (A) of the mesh (A) and (ii) the horizontal length (ℓ2) of the mesh (Mesh) plus the aramid cord (chord) diameter (d) (ℓ1) After obtaining the area (B) obtained by multiplying the vertical length (h2) of the and mesh (a) by adding the aramid cord diameter (d) to the value (h1), the porosity was calculated by substituting them into the following formula (VI).

Surface density (g/㎡)

It was obtained by measuring the weight of a protective net of 1 m width × 1 m length.

Abrasion resistance (time)

The wear resistance was expressed as the time (minutes) required to damage the protection net by attaching the protection net to a rotating friction force tester and then contacting a golf ball rotating at 3,000 rpm on the same portion of the protection net.

[Description of codes]

C: Synthetic fiber code (Chord)

d: diameter of synthetic fiber cord (C)

X: Intersection of synthetic fiber cords (C)

A: Area of mesh

h 2: Vertical length of mesh

ℓ2: transverse length of mesh

h1: The vertical length (h2) of the mesh (mesh) plus the diameter (d) of the aramid cord

ℓ1: The value of the diameter of the aramid cord plus the transverse length (ℓ2) of the mesh

B: Area multiplied by h1 and ℓ1

1: Sports protective net

2: Ball

D: spacing between intersections (X) of synthetic fiber cords

Claims

Synthetic fiber cords in which a plurality of synthetic fiber filaments are combined and twisted are intersected with each other in a knotless type without a knot, and meshes are formed between the intersections of synthetic fiber cords. Forming, the diameter (d) of the synthetic fiber cord (Chord) satisfies the following equation (I), the maximum distance (D1) between the intersection points adjacent to each other satisfies the following equation (II), and the intersection points adjacent to each other A protective net for sports, characterized in that the minimum distance between them (D2) satisfies the following formula (III):

The unit of each of the maximum distance (D1) and the minimum distance (D2) between the diameter (d) of the synthetic fiber cord (Chord) obtained by the formulas (I) to (III) and the adjacent intersections is mm, and m is The mass of the ball, N is the constant 14.14214, ε is the elongation of the synthetic fiber filament material, θ is the impact angle of the ball, σ is the stress of the synthetic fiber filament material, Vo is the maximum velocity of the blown ball, L Is the total length of the net impacted by the hitting ball, obtained by the following formula (IV), h is the height of the net impacted by the hitting ball, obtained by the following formula (V), and R is the impact Paper is the radius of the ball, n is the number of twists applied to the synthetic fiber filaments for the manufacture of synthetic fiber cords,

In the above formula (IV), N2 is an integer of 12, 17 or 24 as the number of intervals (D) between the intersections of the nets impacted by the striking ball, and N1 is a synthetic fiber cord that is impacted by the ball The number of intersections of 1, 2 or 4 integers,

In the formula (V), Vo is the initial velocity of the hitting ball, and θ is the hitting angle of the ball.
The protective net for sports according to claim 1, wherein the synthetic fiber filament is an aramid filament.
The method of claim 1, wherein the synthetic fiber cord is a protective net for sports, characterized in that it comprises an aramid filament.
The protective net for sports according to claim 2, wherein the aramid filament has an elongation of 2% or more and 4% or less.
The protective net for sports according to claim 1, wherein the surface density of the protective net for sports is 1 g/m 2 or more and 100 g/m 2 or less.
According to claim 1, Protective net for sports, characterized in that the resin containing a UV stabilizer is coated on the synthetic fiber cord (Chord).
The protective net for sports according to claim 1, wherein a narrow fabric is sewn at the end of the protective net for sports.
According to claim 1, The protective net for sports characterized in that the cutting strength of the sports protective net is 114daN or more.
The protective net for sports according to claim 1, wherein the porosity of the protective net for sports according to the following formula (VI) is 90% or more:

In the above formula (VI), A is the area of the mesh, and B is the horizontal length (ℓ2) of the mesh (ℓ2) plus the aramid code (chord) diameter (d) (ℓ1) and the mesh (mesh) It is the area obtained by multiplying the length (h2) of the length by adding the aramid cord diameter (d) to the value (h1).
According to claim 1, After the sports protective net is mounted on a rotational friction force tester, contact with a golf ball rotating at 3,000 rpm on the same portion of the protective net is a time required for the protective net to be damaged. A protective net for sports featuring.
The method according to claim 1, wherein the diameter (d) of the synthetic fiber cord (Chord) is 0.85 mm or more and 1.5 mm or less, the maximum distance (D1) of intersections adjacent to each other is 35 mm or less, and the minimum distance (D2) of intersections adjacent to each other. ) Is a protective net for sports, characterized in that 20㎜ or more.
The method according to claim 1, wherein the diameter (d) of the synthetic fiber cord (Chord) is 0.59 mm or more and 0.84 mm or less, the maximum distance (D1) of intersections adjacent to each other is 140 mm or less, and the minimum distance (D2) of intersections adjacent to each other. ) Is a protective net for sports, characterized in that more than 135㎜.
The method according to claim 1, wherein the diameter (d) of the synthetic fiber cord (Chord) is 0.75 mm or more and 1.07 mm or less, the maximum distance (D1) of intersection points adjacent to each other is 50 mm or less, and the minimum distance (D2) of intersection points adjacent to each other. ) Is a protective net for sports, characterized in that more than 40㎜.
The method according to claim 1, wherein the diameter (d) of the synthetic fiber cord (Chord) is 0.73 mm or more and 1.03 mm or less, the maximum distance (D1) of intersection points adjacent to each other is 42 mm or less, and the minimum distance (D2) of intersection points adjacent to each other. ) Is a protective net for sports, characterized in that more than 38㎜.
The method according to claim 1, wherein the diameter (d) of the synthetic fiber cord (Chord) is 0.33 mm or more and 0.47 mm or less, the maximum distance (D1) of intersections adjacent to each other is 126 mm or less, and the minimum distance (D2) of intersections adjacent to each other. ) Is a protective net for sports, characterized in that more than 122㎜.
A protective net for golf, characterized by using the protective net for sports of claim 11.
A protective net for soccer, characterized in that the protective net for sports of claim 12 is used.
A protective net for baseball, characterized by using the protective net for sports of claim 13.
A protective net for tennis, characterized by using the protective net for sports of claim 14.
A protective net for volleyball, characterized in that the sports protective net of claim 15 is used.