JP6775137B2 - Arrow net, manufacturing method of arrow net and mounting structure of arrow net - Google Patents

Description

The present invention relates to an arrow net, a method for manufacturing an arrow net, and a structure for attaching the arrow net, and in particular, an arrow net, a method for manufacturing an arrow net, and an arrow barrier capable of efficiently absorbing the penetrating force of an arrow. Regarding the mounting structure of the net.

An arrow net that is installed in archery stadiums and archery fields to stop arrows that deviate from the target is known (for example, Patent Document 1). Here, conventionally, the arrow-proofing ability is enhanced by forming the thickness of the arrow-proofing net thicker or forming the mesh smaller (that is, increasing the fulfillment rate), or a plurality of arrow-proofing nets are provided. By stacking them, the arrow protection ability was improved.

Utility Model Registration No. 3143151 (eg, paragraph 0023, FIG. 1)

However, forming a thicker arrow net, making the mesh smaller, or stacking a plurality of arrow nets reduces the air permeability and daylighting, and increases the weight, so that the net can be used as a net. The advantages of

On the other hand, as a result of diligent studies to solve the above-mentioned problems, the applicant of the present application has determined a Russell net in which the mesh is formed into squares as a net having high mesh shape stability (the mesh is hard to be deformed). I came up with the idea of using it for an arrow net (not known at the time of this application).

However, as a result of increasing the shape stability of the mesh, there is less room for deformation of the mesh, and when an arrow is stabbed with a predetermined penetrating force, the mesh threads forming the mesh and the knots of the mesh threads break. It was found that the penetrating force of the arrow could not be absorbed efficiently because it became easy to break (when the penetrating force of the arrow exceeded the rigidity of the mesh, the fracture was likely to occur immediately).

The present invention has been made in the context of such circumstances, and relates to an arrow-proof net capable of efficiently absorbing the penetrating force of an arrow, a method for manufacturing the arrow-proof net, and a mounting structure of the arrow-proof net.

Means for Solving Problems and Effects of Invention

According to the method for manufacturing the arrowhead net according to claim 1 or the arrowhead net according to claim 4, since the mesh is formed into rhombus, the mesh is deformed as compared with the Russell net in which the mesh is formed into squares. Can give room for. That is, when the arrow penetrates the mesh, it is suppressed that the mesh thread and the knot portion between the mesh threads are immediately broken, and the mesh thread abuts on the outer circumference of the arrow while the mesh expands (giving frictional force). Therefore, there is an effect that the penetrating force of the arrow can be efficiently absorbed.

In addition, "rhombus" is defined as a mesh formed in a rhombus shape, a turtle shell shape, or a substantially hexagonal shape ("rough hexagonal shape" is a shape close to a hexagon, but is actually The inner circumference of the mesh may be formed to draw a curve, so it is defined as including it). That is, the "hishime" is formed by knotting the knots of the net threads in a meandering manner with respect to the knitting net direction (extending direction of the net threads).

Therefore, the net threads extend parallel or perpendicular to the knitting net direction (the knots are knotted in a manner of being scattered parallel or perpendicular to the knitting net direction, and the mesh is formed in a grid pattern). The Russell net of "mesh" has little room for deformation of the net, whereas the Russell net of "hishime" is knotted in a manner in which the knots of the net threads meander in the direction of the knitting net. It can give room for deformation in the mesh.

Further, Amiito is first connects a nodal portion of the yams to each other are nodules, and connecting portions that nodules each other are continuously provided, the connecting portion to each other facing in the mesh in the first direction 1 Since it is provided with a thread, when the arrow penetrates the mesh, the first thread can be brought into contact with the outer circumference of the arrow. Therefore, the contact area between the arrow and the net thread (first thread) is increased, and the frictional force applied to the arrow can be increased, so that there is an effect that the penetrating force of the arrow can be efficiently absorbed.

Further , since the net thread includes a second thread that connects the first thread and the continuous portions facing each other in the mesh in the second direction that is orthogonal to the first direction, the arrow penetrates the mesh. At that time, the second thread can be brought into contact with the outer circumference of the arrow. Therefore, the shape of the mesh when the arrow penetrates is made to be a shape close to a circle, the contact area between the arrow and the mesh thread (the first thread and the second thread) is increased, and the frictional force applied to the arrow is increased. Can be done. Therefore, there is an effect that the penetrating force of the arrow can be efficiently absorbed.

Further , the first thread and the second thread in the mesh are each composed of the same insertion thread, and the insertion threads constituting the first thread and the second thread in the mesh are a pair adjacent to the mesh on one side in the first direction. As well as knotting the nodule of the above, a pair of knots adjacent to the mesh are knotted on both sides in the second direction, so that the mesh expands when the arrow penetrates the mesh, so that the first thread and the second thread are knotted. The portion can be pulled toward the mesh side to increase the rigidity of the mesh when the mesh spreads. That is, in the initial stage of the arrow penetrating, the mesh can be deformed, and after the arrow begins to penetrate, the mesh can be made highly rigid, so that the penetrating force of the arrow can be efficiently absorbed. effective.

According to the method for manufacturing the arrow net according to claim 2 or the arrow net according to claim 5 , in addition to the effect of the method for manufacturing the arrow net according to claim 1 or the arrow net according to claim 4 . The insert yarns constituting the first yarn and the second yarn in the mesh form the first yarn and the second yarn in the second mesh adjacent to the mesh in which the first yarn and the second yarn are formed. The first thread and the second thread can easily pull the knot to the mesh side. Therefore, there is an effect that the rigidity of the mesh when the mesh is expanded can be further increased, and the penetrating force of the arrow can be efficiently absorbed.

According to the manufacturing method of claim 3 Boya net or Boya net according to claim 6, wherein, in addition to the effects of the process according to claim 2 Boya net or Boya net according to claim 5, wherein the description, The part where the knots of the net yarn are knotted is formed with a thickness of 10,000 decitex or more and 19000 decitex or less, and the fulfillment rate of the net yarn is 65% or more and 80% or less. Therefore, the weight of the raw yarn used. It is possible to form an arrow-proof net having a net yarn filling rate of 65% or more and 80% or less while suppressing an increase in the amount of net yarn. Therefore, there is an effect that an arrow-proof net having breathability and daylighting property can be formed at low cost.

According to the manufacturing method of Boya net according to claim 7, in addition to the effects of the manufacturing method of Boya net according to claim 6, net weaving process, since the net weaving by 11 gauge Russell network machine, using It is possible to form an arrow-proof net having a net yarn filling rate of 65 or more and 80% or less while further suppressing an increase in the weight of the raw yarn. Therefore, there is an effect that an arrow-proof net having breathability and daylighting property can be formed at a lower cost.

According to the attachment structure of the arrow-proof net according to claim 8, the first arrow-proof net disposed on the shot side and the first arrow-proof net arranged on the back side opposite to the shot side. Since it is equipped with a second arrow-proof net that is formed to be less rigid than the first arrow-proof net, the high penetration force at the initial stage of the arrow sticking is absorbed by the first arrow-proof net, and the penetration force is weakened. The arrow can be caught by the second arrow net. In this case, since the second arrow-proof net is formed to have lower rigidity than the first arrow-proof net and is easily bent, it is possible to easily pass the load due to the penetrating force of the arrow to the entire second arrow-proof net. Therefore, there is an effect that the penetrating force of the arrow can be efficiently absorbed.
Further, since the first arrow-proof net is composed of the arrow-proof net according to claim 3, the first arrow-proof net can efficiently absorb the penetrating force of the arrow, and the second arrow-proof net can be efficiently absorbed by that amount. The rigidity of the can be set low. Therefore, since the weight of the raw yarn used for the second arrow-proof net can be reduced, there is an effect that the installation cost of the arrow-proof net can be suppressed.
Further, since the filling rate of the net thread surrounding the mesh of the second arrow-proof net is formed lower than the filling rate of the net thread of the first arrow-proof net, it is possible to prevent the arrow-proofing ability of the arrow-proof net from being lowered. At the same time, the weight of the second arrow-proof net can be reduced (breathability and light collection are enhanced). Therefore, there is an effect that the installation cost of the arrow net can be suppressed.

According to the mounting structure of the arrow-proof net according to claim 9 , in addition to the effect of the mounting structure of the arrow-proof net according to claim 8 , the first arrow-proof net and the second arrow-proof net are on the shot side and the back surface. Since they are arranged apart from each other on the side, it is possible to easily increase the angle of incidence of the arrow with respect to the second arrow protection net.

That is, since the arrow penetrates the first arrow-proof net and its thrust is weakened, the angle of incidence of the arrow on the second arrow-proof net tends to be larger than the angle of incidence of the arrow on the first arrow-proof net. Therefore, it is possible to suppress the concentration of the penetrating force of the arrow at one point of the second arrow-proof net and enhance the effect of the bending of the second arrow-proof net, so that the penetrating force of the arrow can be efficiently absorbed. There is an effect.

According to the mounting structure of the arrow-proof net according to claim 10 , in addition to the effect of the mounting structure of the arrow-proof net according to claim 9 , the distance between the first arrow-proof net and the second arrow-proof net is approximately 600 mm or less. Since it is set to, the installation space of the arrow net can be suppressed. Further, the distance between the first arrow-proof net and the second arrow-proof net can be adjusted according to the assumed penetrating force of the arrow. Therefore, there is an effect that the installation space occupied by the arrow net can be minimized.

According to the mounting structure of Boya net according to claim 11, in addition to the effects of the mounting structure of Boya net according to claim 8, second Boya net is composed of Boya net claim 3, wherein The part where the knots of the first arrow net is knotted is formed with a thickness of 15500 decitex or more and 19000 decitex or less, and the net thread filling rate is 71% or more and 80% or less. The part where the knots of the second arrowhead net are knotted is formed with a thickness of 10,000 decitex or more and less than 15,500 decitex, and the fulfillment rate of the net thread is 65% or more and less than 71%. It is possible to suppress an increase in the weight of the raw yarn used and to form an arrow-proof net suitable for competitions with relatively high arrow penetration (for example, an archery with a distance from the shooting position to the target of about 10 m). In field competitions, arrows can be prevented from penetrating (penetrating) the arrow net).

According to the attachment structure of the arrow-proof net according to claim 12 , in addition to the effect of the attachment structure of the arrow-proof net according to claim 8 , the portion where the knots of the net thread of the first arrow-proof net are knotted is , 15500 decitex or more and 19000 decitex or less, and the fulfillment rate of the net yarn is 71% or more and 80% or less. The second arrow-proof net is an insertion yarn and a loop yarn made of raw yarn of a fiber material. The mesh is formed as a square Russell network, and the mesh is formed as a square Russell mesh, and the mesh of the second arrow-proof net is 6000 decitex or more and 10000 decitex. Since it is formed with a thickness of less than 55% and the fulfillment rate of the net yarn is 55% or more and less than 65%, the increase in the weight of the raw yarn used is suppressed and the penetrating power of the arrow becomes a standard competition. A suitable arrow-proof net can be formed (for example, in a general archery competition in which the distance from the shooting position to the target is about 70 m, it is possible to prevent the arrow from penetrating (penetrating) the arrow-proof net).

According to the attachment structure of the arrow-proof net according to claim 13 , in addition to the effect of the attachment structure of the arrow-proof net according to claim 8 , the portion where the knots of the net thread of the first arrow-proof net are knotted is It is formed with a thickness of 10,000 decitex or more and less than 15,500 decitex, and the fulfillment rate of the net yarn is 65% or more and less than 71%. The mesh is formed as a square Russell network, and the mesh is formed as a square Russell mesh, and the mesh of the second arrow-proof net is 6000 decitex or more and 10000 decitex. Since it is formed with a thickness of less than 55% and the fulfillment rate of the net yarn is 55% or more and less than 65%, the increase in the weight of the raw yarn used is suppressed and the penetration force of the arrow is relatively low. A suitable arrowproof net can be formed (for example, in a Japanese bow competition, it is possible to prevent an arrow from penetrating (penetrating) the arrowproof net).

It is a schematic diagram which shows the shooting range where the arrow net is installed in 1st Embodiment of this invention. (A) is a partially enlarged view of the arrow-proof net, and (b) is a partially enlarged view showing a state in which an arrow penetrates the arrow-proof net of FIG. 2 (a). (A) is a schematic view showing a shooting range in which an arrow-proof net is installed in the second embodiment, and (b) is a cross-sectional view of the arrow-proof net in line IIIb-IIIb of FIG. 3 (a). is there. (A) is a cross-sectional view showing a state in which an arrow penetrates the arrow-proof net of FIG. 3 (b), and (b) is a table showing the result of a strength verification test of the arrow-proof net. (A) is a cross-sectional view of the arrow-proof net according to the third embodiment, and (b) is a cross-sectional view showing a state in which an arrow penetrates the first arrow-proof net of FIG. 5 (a). c) is a cross-sectional view showing a state in which the arrow is in contact with the second arrow protection net from the state of FIG. 5 (b).

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. First, with reference to FIG. 1, the overall configuration of the arrowhead net 1 according to the first embodiment will be described. FIG. 1 is a schematic view showing a shooting range 100 in which the arrow net 1 according to the first embodiment of the present invention is installed. In FIG. 1, the arrow net 1 and the shooting range 100 are schematically illustrated for ease of understanding.

As shown in FIG. 1, the shooting range 100 is a place for shooting archery, and a target 101 is installed in the shooting range 100, and the back side of the target 101 (the back side of the paper in FIG. 1). A pair of columns 102 and a pair of wire ropes 103 erected on the pair of columns 102 are arranged in the.

The support column 102 and the wire rope 103 are support members for supporting the arrow-proof net 1. The pair of columns 102 are erected vertically on the ground of the shooting range 100, and the pair of wire ropes 103 are the upper ends (upper end of FIG. 1) and the lower ends (upper end of FIG. 1) of the pair of wire ropes 103. It is erected between each other (lower end). With these columns 102 and wire rope 103, both ends of the arrow net 1 in the vertical direction (upper end and lower end in FIG. 1) and both ends in the horizontal direction (left and right ends in FIG. 1) are provided. Department) and are supported (expanded) respectively.

The arrow net 1 is a net for receiving an arrow deviated from the target 101 by being arranged on the back side of the target 101, and is an insertion thread and a loop thread (both not shown) made of raw yarn of a fiber material. ) Is formed as a Russell net, and the net yarn 2 is formed by knitting the insertion yarn and the loop yarn, and the mesh 3 is formed as an opening surrounded by the net yarn 2.

The raw yarns that form the insert yarns and loop yarns are made of polyester fibers with a yarn thickness of 1670 decitex, the strength of the yarn is set to 7.3 cN / dT, and the elongation of the yarn is 15%. Set.

The net thread 2 is formed by knitting an insertion thread and a loop thread, and is formed as a portion where the net threads 2 are knotted, and a knot portion 20 and a continuous portion in which the knot portions 20 are connected to each other. 21 and the first yarn 22 connecting the continuous portion 21 in the first direction (the left-right direction in FIG. 1; the direction perpendicular to the extending direction (knitting net direction) of the net yarn 2) and the first direction. Is formed at a position facing the first yarn 22 (opposing in the space of the mesh 3) in a vertical direction (vertical direction in FIG. 1; extending direction of the mesh yarn 2 (knitting net direction)). , A second thread 23 that connects the continuous portion 21 in the first direction is provided.

In order to facilitate understanding, in the following description, the first direction (the left-right direction in FIG. 1, the direction perpendicular to the extending direction of the net thread 2) is defined as the left-right direction, and the second direction (the left-right direction). The vertical direction in FIG. 1; the extending direction of the net thread 2) is defined as the vertical direction.

The knot portion 20 is a portion where a plurality of net threads 2 extending in the vertical direction are knotted, and is scattered at predetermined intervals along the vertical direction and the horizontal direction, and points in a manner meandering in the vertical direction. Formed in existence.

The continuous portion 21 is a portion formed in an inclined posture with respect to the vertical direction and in which the meandering nodule portions 20 are connected to each other. The mesh 3 is formed as a substantially hexagonal opening (void) by the nodule portion 20 and the continuous portion 21. That is, the mesh 3 is formed in the shape of a rhombus, and the mesh 3 of the rhombus is a gap portion of the arrow net 1. In the present embodiment, the gap of the mesh 3 with respect to the outer area of the arrow net 1 The ratio is set to 25% (the fulfillment rate of the net thread 2 of the arrow net 1 (the ratio of the actual area of the net thread 2 to the outer area of the arrow net 1) is formed at 75%).

The first thread 22 is a portion that connects a pair of continuous portions 21 adjacent to each other on the upper side of the mesh 3, and the second thread 23 connects a pair of continuous portions 21 adjacent to each other on the lower side of the mesh 3. It is a part to be used. The first thread 22 and the second thread 23 are respectively extended along the left-right direction of the mesh 3, and the first thread 22 and the second thread 23 are formed to form a substantially hexagonal opening portion of the mesh 3. Is a shape close to a circle (approximately an octagonal shape).

Next, with reference to FIG. 2A, the insertion thread Y constituting the first thread 22 and the second thread 23 will be described. FIG. 2A is a partially enlarged view of the arrowhead net 1. In addition, in FIG. 2A, in order to facilitate understanding, among the insertion yarns and loop yarns constituting the mesh yarn 2, the insertion yarns constituting the first yarn 22 and the second yarn 23 in one mesh 3 are inserted. Only Y is shown, and the arrow net 1 is schematically shown. Further, the first thread 22 and the second thread 23 in the plurality of meshes 3 other than the one mesh 3 are also formed from the insertion threads that pass through the same path as the insertion thread Y.

As shown in FIG. 2A, the first thread 22 and the second thread 23 facing each other in one mesh 3 are each composed of the same (one) insertion thread Y. The insertion thread Y is a pair of knots 20 on one side (in the present embodiment, a pair on the left side) of a pair of knots 20 adjacent to one mesh 3 in the left-right direction (horizontal direction in FIG. 2A). The knot portion 20) and the pair of knot portions 20 adjacent to the mesh 3 in the vertical direction (vertical direction in FIG. 2A) are each knotted.

More specifically, the insertion thread Y knots the knot portion 20 on the lower side of the mesh 3, and is connected to one of the pair of tethers 21 connected to the knot 20. A second thread 23, a continuous portion 21 connected to the left side of the second thread 23, and a continuous portion 21 thereof, which are extended to the left from 21 (in the present embodiment, the continuous portion 21 on the right side). By passing through the first thread 22 connected to the left side of the continuous portion 21 and the continuous portion 21 connected to the left side of the first thread 22, the first thread 22 facing each other across the continuous portion 21 And the second thread 23 are formed.

The insertion thread Y forming the first thread 22 and the second thread 23 facing each other across the continuous portion 21 knots the knot portion 20 located above the first thread 22 and is connected to the knot portion 20. By extending in the right direction from the continuous portion 21 (in the present embodiment, the continuous portion 21 on the left side) of one of the pair of continuous portions 21 to be provided, the second thread 23 and its The connecting portion 21 connected to the right side of the second thread 23, the first thread 22 connected to the right side of the connecting portion 21, and the connecting portion 21 connected to the right side of the first thread 22 are connected. By passing through, the first thread 22 and the second thread 23 that face each other across the continuous portion 21 are formed. After that, the first thread 22 and the second thread 23 are formed while knotting the nodule portion 20 by following the same route.

That is, the insertion thread Y constituting the first thread 22 and the second thread 23 facing each other in the one mesh 3 is the other thread adjacent to the one mesh 3 on which the first thread 22 and the second thread 23 are formed. The first thread 22 and the second thread 23 (the other mesh 3 adjacent to the upper left of the one mesh 3) of the two meshes 3 (in the present embodiment, the mesh 3 adjacent to the upper left and the lower left of the one mesh 3). The second thread 23 of the above and the first thread 22) of the other mesh 3 adjacent to the lower left of the one mesh 3 are formed.

Here, the insertion yarn and the loop yarn are each formed from one raw yarn (thickness is 1670 decitex), but the loop yarn is knitted while forming an annular loop, so that the loop yarn is a loop yarn. The thickness of the yarn is substantially the thickness of three yarns. In the present embodiment, since the knot portion 20 is formed of two insertion threads and one loop thread, the thickness of the knot portion 20 is the thickness of five raw threads (8350 decitex). ..

On the other hand, the first thread 22 and the second thread 23 are formed by the insertion thread Y (the insertion thread Y is not knitted along the extending direction of the continuous connection portion 21, but the continuous connection portion 21 is formed. The thickness of the continuous connection portion 21 is formed to be thinner than the thickness of the knot portion 20 by one insertion thread (one raw thread).

The "site where the nodules of the net thread are knotted" in the claim corresponds to a portion where the pair of nodules 20 are nodule, and in the present embodiment, the pair of nodules 20 are knotted. The nodular site is formed to a thickness of 16700 decitex (because the thickness of one nodule 20 is 8350 decitex).

In this case, the portion where the pair of nodule portions 20 are knotted is preferably formed with a thickness of 10,000 decitex or more and 19000 decitex or less. For example, if it is made thinner than 10000 decitex, the voids in the mesh become large, making it difficult to efficiently absorb the penetrating force of the arrow, and if it is made thicker than 19000 decitex, the fulfillment rate becomes excessive and the advantage as a net is impaired. ..

On the other hand, the portion where the pair of knots 20 are knotted is set to a thickness of 10,000 decitex or more and 19000 decitex or less (16,700 decitex in this embodiment), and the fulfillment rate of the net thread 2 is 65% or more. By setting it to 80% or less (75% in the present embodiment), it has an arrow-proofing ability while suppressing an increase in the weight of the raw yarn used (inside the mesh 3 rather than the outer circumference of the arrow A described later). The arrow net 1 (which is formed with a small circumference) can be formed. Therefore, the arrow net 1 having breathability and daylighting can be formed at low cost.

Further, it is more preferable that the portion where the pair of nodule portions 20 are knotted is set to a thickness of 15500 decitex or more and 19000 decitex or less, and the filling rate of the net thread 2 is set to 71% or more and 80% or less. As a result, even when one arrow-proof net 1 is installed on the back side of the target 101, it is possible to prevent the arrow A from penetrating the arrow-proof net 1 in the general archery competition described later (arrow A). Everything can be taken without penetrating).

Next, a case where the archery arrow A penetrates the arrow net 1 (mesh 3) will be described with reference to FIG. 2 (b). FIG. 2B is a partially enlarged view showing a state in which the arrow A penetrates the arrowproof net 1 of FIG. 2A. In FIG. 2B, the arrow net 1 and the arrow A are schematically illustrated for ease of understanding.

As shown in FIG. 2B, when an arrow penetrates the arrow net 1 (mesh 3), the net thread 2 forming the mesh 3 is expanded and abuts on the arrow A, thereby exerting a frictional force on the arrow A. It acts and the penetrating force of arrow A is absorbed. In this case, since the mesh 3 is formed as a rhombic Russell network, the mesh 3 can be provided with room for deformation as compared with the Russell network in which the mesh is formed as a square mesh.

That is, when the arrow A penetrates the mesh 3, the expansion of the mesh 3 can prevent the mesh thread 2 and the knot portion 20 to which the mesh threads 2 are knotted from being immediately broken. Therefore, since the mesh thread 2 comes into contact with the outer circumference of the arrow A while the mesh 3 expands, it is possible to efficiently apply a frictional force to the penetrating arrow A.

Here, even when the arrow-proof net is formed as a rhombic Russell net, for example, if the arrow A is formed as a quadrangular (rhombus) rhombus, the outer circumference of the arrow A when the arrow A penetrates the mesh. It is difficult to bring the net thread 2 into contact with the entire line of the arrow A, and it is not possible to efficiently apply a frictional force to the arrow A.

On the other hand, according to the arrow net 1 of the present embodiment, since the mesh 3 is formed into a substantially hexagonal rhombus, the shape of the mesh 3 is made closer to a circular shape, and the arrow A is efficiently formed. Friction force can be applied.

Further, since the first thread 22 for connecting the continuous portions 21 facing each other in the left-right direction in the mesh 3 is provided, when the arrow A penetrates the mesh 3, the first thread 22 is inserted along the outer circumference of the arrow A. Can be brought into contact. Therefore, the contact area between the arrow A and the net thread 2 is increased, and the frictional force applied to the arrow A can be increased.

Further, in addition to the first thread 22, the first thread 22 and the second thread 23 which are vertically opposed to each other in the mesh 3 and which connect the continuous portions 21 are provided, so that the arrow A forms the mesh 3. When penetrating, the second thread 23 can be brought into contact with the outer circumference of the arrow A. That is, since the shape of the mesh 3 becomes closer to a circle by the first thread 22 and the second thread 23, the contact area between the arrow A and the mesh thread 2 is increased when the arrow A penetrates. , The frictional force applied to the arrow A can be further increased.

Further, the first thread 22 and the second thread 23 are composed of the same (one) insertion thread Y, and the insertion thread Y is a pair of nodule portions 20 adjacent to one mesh 3 in the left-right direction. Of these, since the knot portion 20 on one side and the pair of knot portions 20 adjacent to the mesh 3 in the vertical direction are each formed as an insertion thread, when the arrow A penetrates the mesh 3 and the mesh 3 spreads. , The first thread 22 and the second thread 23 pull the knot portion 20 toward the mesh 3 side.

That is, in the initial stage where the arrow A penetrates, the mesh 3 has room for deformation, whereas when the arrow A begins to penetrate, the knot portion 20 is meshed by the first thread 22 and the second thread 23. It is attracted to the 3 side and the rigidity of the mesh 3 is increased. Therefore, the high penetrating force at the initial stage through which the arrow A penetrates is absorbed by the mesh 3 having room for deformation, and the penetrating force whose propulsive force is weakened by the arrow A starting to penetrate is increased in rigidity (first). By pulling the knot portion 20 toward the mesh 3 side by the thread 22 and the second thread 23, the knot portion 20 can be absorbed by the mesh 3 (which has higher rigidity than before the penetration of the arrow A).

In this case, the insertion thread Y constituting the first thread 22 and the second thread 23 facing each other in the one mesh 3 is adjacent to the one mesh 3 on which the first thread 22 and the second thread 23 are formed. Since the first thread 22 and the second thread 23 are also formed in the other mesh 3, the knot portion 20 can be easily attracted to the mesh 3 side by the first thread 22 and the second thread 23. Therefore, the rigidity of the mesh when the mesh 3 is expanded can be further increased.

As described above, according to the arrow-proof net 1 of the present embodiment, the penetrating force of the arrow A can be efficiently absorbed.

Next, a method of manufacturing the arrow net 1 will be described. The method for manufacturing the arrow net 1 is to form a knitted net body (before the heat treatment is performed and before the arrow net 1 is shrunk by the heat treatment (raw dough)) having the same shape as the arrow net 1 described above. It is provided with a knitting process for knitting and a heat treatment step for applying heat treatment to the knitted net body formed by the knitting process.

In the knitting process, the knitted net body is knitted by the Russell netting machine, and in the present embodiment, the knitting is performed by the Russell netting machine of 11 gauge (the number of needles per 1 inch is 11). The heat treatment step is a step performed after the knitting net step, and hot air of 180 to 190 ° is blown into the knitted net body knitted in the knitting step in a heating furnace to perform heat treatment. By this heat treatment, the knitted net body contracts to form an arrow net 1 having a fulfillment rate of 75% for the net yarn 2.

Here, in the case of manufacturing the arrow net 1, in the knitting process, a 10-gauge to 12-gauge Russell netting machine is used to make the part where the pair of knots 20 are knotted with a thickness of 10,000 decitex or more and 19000 decitex or less. It is preferable to knit the net with a wire, and more preferably to knit with an 11 gauge Russell net machine.

For example, if a net is knitted with a thickness of less than 10,000 decitex at a portion where a pair of knots 20 are knotted, the thickness of the net thread becomes thin, so that the area of the gap of the mesh increases and the penetrating force of the arrow A increases. It becomes difficult to absorb. Further, if the portion where the pair of nodule portions 20 are knotted is formed thicker than 19000 decitex, the filling rate becomes excessive, the air permeability and the daylighting property are lowered, and the advantage as a net is impaired.

Further, when knitting a portion where a pair of knots 20 are knotted with a thickness of 10000 decitex or more and 19000 decitex or less, if the net is knitted by a 9 gauge Russell net machine, the distance between the needles of the Russell net machine is wide. Therefore, it is difficult to form the net yarn with a fullness rate of 65% or more and 80% or less (in order to increase the fullness rate, it is necessary to make the raw yarn thicker). Further, when the net is knitted by a Russell net machine having a gauge of 13 gauge or more, the filling rate of the net yarn exceeds 80% (the filling rate becomes excessive), so that the advantage as a net is impaired. Further, in a Russell netting machine having a gauge of 12 gauge or more, the distance between the needles becomes narrow, and for example, when knitting with a 1670 decitex yarn, there is a problem that the needles break.

On the other hand, in the knitting process, a 10-12 gauge Russell netting machine is used to knit the part where the pair of knots 20 are knotted with a thickness of 10,000 decitex or more and 19000 decitex. Since it is possible to form an arrow-proof net 1 having a net yarn 2 fulfillment rate of 65% or more and 80% or less while further suppressing an increase in the weight of the raw yarn (fiber material), the net yarn 2 is provided with breathability and daylighting property. The arrow net 1 can be manufactured at low cost.

In this case, in the present embodiment, since the arrow net 1 is knitted by an 11-gauge Russell net machine in the knitting process, an increase in the weight of the raw yarn used can be further suppressed, and the air permeability can be further suppressed. And the arrow net 1 having daylighting property can be manufactured at a lower cost. Further, by using the 11 gauge Russell netting machine, the distance between the needles of the Russell netting machine becomes wider than that of 12 gauge, so that the above-mentioned problem that the needle of the Russell netting machine breaks can be suppressed.

Next, the arrowhead net 201 of the second embodiment will be described with reference to FIG. In the first embodiment, the case where one arrow net 1 is supported (extended) on the support column 102 and the wire rope 103 has been described, but in the second embodiment, two sheets are supported on the support column 102 and the wire rope 103. The first arrow-proof net 201A and the second arrow-proof net 201B are supported. The same parts as those in the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted.

FIG. 3A is a schematic view showing a shooting range 100 in which the arrow net 201 according to the second embodiment is installed, and FIG. 3B is a protection taken along line IIIb-IIIb of FIG. 3A. It is sectional drawing of the arrow net 201. In FIG. 3, the arrow net 201 and the shooting range 100 are schematically illustrated for ease of understanding.

As shown in FIG. 3, the arrow net 201 is located on the side opposite to the shot side of the first arrow net 201A arranged on the shot side (target 101 side) and the first arrow net 201A. A second arrow-proof net 201B is provided on the back side, and the first arrow-proof net 201A and the second arrow-proof net 201B are arranged in close contact with each other.

The first arrow-proof net 201A is formed with the same configuration as the arrow-proof net 1 of the first embodiment, and the second arrow-proof net 201B has a lower rigidity (easily bends) than the first arrow-proof net 201A. It is formed. More specifically, in the second arrow net 201B, the thickness of the portion where the pair of nodule portions 20 are nodule is 14000 decitex, the fulfillment rate is formed to 68%, and the other configurations are the first. 1 It has the same configuration as the arrow net 201A.

Next, a case where an arrow penetrates the arrow-proof net 201 will be described with reference to FIG. 4A. FIG. 4A is a cross-sectional view showing a state in which an arrow penetrates the arrowproof net 201 of FIG. 3B. In FIG. 4A, the arrow net 201 and the arrow A are schematically illustrated for ease of understanding.

As shown in FIG. 4A, when an arrow pierces the arrow-proof net 201, the arrow A penetrating the first arrow-proof net 201A comes into contact with the second arrow-proof net 201B. In this case, since the rigidity of the second arrow net 201B arranged on the back side is set lower than that of the first arrow net 201A arranged on the shot side, the high penetration at the initial stage where the arrow A is pierced is set. The force is absorbed by the first arrow-proof net 201A, and the arrow A whose penetrating force is weakened by the first arrow-proof net 201A can be received by the second arrow-proof net 201B.

That is, since the second arrow-proof net 201B is formed to have lower rigidity than the first arrow-proof net 201A and is easily bent, the load due to the penetrating force of the arrow A is parried to the entire second arrow-proof net 201B. .. Therefore, the penetrating force of the arrow A can be efficiently absorbed.

Further, since the high penetrating force at the initial stage of the arrow A being pierced is absorbed by the first arrow-proof net 201A, the rigidity of the second arrow-proof net 201B can be set lower accordingly. That is, as in the present embodiment, the thickness of the portion where the pair of nodule portions 20 of the second arrow-proof net 201B are knotted (14000 decitex in the present embodiment) is set to the thickness of the first arrow-proof net 201A. Since the thickness of the portion where the pair of nodule portions 20 are knotted (16,700 decitex in the present embodiment) can be made thinner (the fulfillment rate is lowered), the arrow-proofing ability of the arrow-proof net 201 is reduced. It is possible to reduce the weight of the second arrow-proof net 201B (improve the air permeability and the daylighting property) while suppressing this. Therefore, the installation cost of the arrow net 201 can be suppressed.

Here, there are a plurality of types of archery competitions, and the distance from the shooting position to the target 101 differs for each competition. For example, in general archery competitions, the distance from the shooting position to the target 101 is set to about 70 m, whereas in archery field competitions it is set to 10-60 m and in indoor competitions it is set to about 18 m. When the arrow-proof net 201 is arranged on the back side of the target 101, as the distance from the shooting position to the target 101 becomes shorter, it is necessary to increase the arrow-proofing ability of the arrow-proof net 201 accordingly. Further, if the distance from the shooting position to the target 101 becomes long, the arrow protection ability may become excessive.

In this case, the thickness of the portion where the pair of knots 20 of the first arrow net 201A are knotted is formed to have a thickness of 15500 decitex or more and 19000 decitex or less, and the fulfillment rate of the net thread 2 is 71% or more. It is formed with less than 80% (other configurations are formed with the same configuration as the arrow net 1), and the thickness of the part where the pair of knots 20 of the second arrow net 201B are knotted is 10,000 decitex or more and 15500. By forming with a thickness less than decitex and forming the net thread 2 with a fulfillment rate of 65% or more and less than 71% (other configurations are formed with the same configuration as the arrow net 1), for example. Even when the distance from the shooting position to the target 101 is set to 10 m in the field competition, it is possible to prevent the arrow A from penetrating (penetrating) the arrow net 201 (the fulfillment rate of the arrow net 201). It is possible to form an arrow net 201 suitable for field competition while suppressing excess).

Next, with reference to FIG. 4B, the difference in strength of the arrow-proof net 201 depending on how the first arrow-proof net 201A and the second arrow-proof net 201B are attached will be described. FIG. 4B is a table showing the results of the strength verification test (hereinafter referred to as “test”) of the arrow net 201. In this test, the first arrow net 201A or the second arrow net 201B is arranged in close contact with the shot side and the back side of the arrow net 201, and the arrow A is directed toward the surface of the shot side. Shall shoot. In the test, the arrow A was shot 10 times at the arrow net 201, and the average value of the penetration distance of the arrow A from the back side of the arrow net 201 (the column of the penetration distance in FIG. 4B) was displayed. (See) was calculated.

As shown in FIG. 4B, when two first arrow-proof nets 201A are stacked and attached, the average penetration distance of the arrow A is 289 mm, whereas two second arrow-proof nets 201B are stacked. The average penetration distance of the arrow A was 336 mm when it was attached. That is, the penetrating force of the arrow A can be absorbed more effectively when two first arrow-proof nets 201A having higher rigidity are stacked.

On the other hand, when two sheets of the first arrow net 201A and the second arrow net 201B are overlapped, the average penetration distance of the arrow A when the first arrow net 201A is attached to the shot side is 307 mm. However, when the second arrow net 201B was attached to the shot side, the average penetration distance of the arrow A was 326 mm. That is, when the first arrow net 201A and the second arrow net 201B having different rigidity (flexibility) are mounted on top of each other as in the arrow net 201 of the second embodiment, the first arrow net with high rigidity is installed. By arranging the net 201A on the shot side and arranging the second arrowproof net 201B having a lower rigidity on the back side, the penetrating force of the arrow A can be efficiently absorbed.

Next, the arrowhead net 301 of the third embodiment will be described with reference to FIG. In the second embodiment, the case where the first arrow-proof net 201A and the second arrow-proof net 201B are arranged in close contact with each other has been described, but in the third embodiment, the first arrow-proof net 301A and the second arrow-proof net 301A and the second arrow-proof net 201B have been described. 2 The arrow net 301B is arranged on the shot side and the back side in a state of being separated from each other. The same parts as those in the above-described embodiments are designated by the same reference numerals, and the description thereof will be omitted.

5 (a) is a cross-sectional view of the arrow-proof net 301 according to the third embodiment, and FIG. 5 (b) shows a state in which the arrow A penetrates the first arrow-proof net 301A of FIG. 5 (a). 5 (c) is a cross-sectional view showing a state in which the arrow A abuts on the second arrow protection net 301B from the state of FIG. 5 (b). In FIG. 5, the arrow net 301 and the arrow A are schematically shown for ease of understanding.

As shown in FIG. 5, the arrow net 301 is located on the side opposite to the shot side of the first arrow net 301A arranged on the shot side (target 101 side) and the first arrow net 301A. A second arrow-proof net 301B is provided on the back side, and the first arrow-proof net 301A and the second arrow-proof net 301B are arranged in a state of being separated from each other on the shooting side and the back side, respectively.

The first arrow-proof net 301A is formed from the same configuration as the first arrow-proof net 201A, and the second arrow-proof net 301B is formed from the same configuration as the second arrow-proof net 201B. Further, the distance (distance between the first arrow-proof net 301A and the second arrow-proof net 301B) is set to 500 mm.

In this case, since the first arrow-proof net 301A and the second arrow-proof net 301B are arranged apart from each other on the shot side and the back side, the arrow A penetrating the first arrow-proof net 301A has its thrust. Is weakened, and the angle of incidence of the arrow A on the second arrow net 301B tends to be larger than the angle of incidence on the first arrow net 301A. Therefore, it is possible to suppress the penetrating force of the arrow A from concentrating on one point of the second arrow protection net 301B, and enhance the effect of shock absorption due to the bending of the second arrow protection net 301B.

Although the present invention has been described above based on the above-described embodiment, the present invention is not limited to the above-described embodiment, and it is easy that various modifications and improvements can be made without departing from the spirit of the present invention. It can be inferred from.

In each of the above embodiments, the case where the mesh 3 is formed into a substantially hexagonal rhombus has been described, but the present invention is not necessarily limited to this, and for example, a polygon other than a hexagon may be used. It may be circular. That is, the shape of the mesh is not limited as long as the nodule 20 is formed in a meandering manner, but it is preferable to form a shape closer to a circle.

In each of the above embodiments, the case where the first thread 22 and the second thread 23 are connected to the continuous portion 21 (the first thread 22 and the second thread 23 are formed in one mesh 3) has been described. However, the present invention is not necessarily limited to this, and for example, a configuration in which only the first thread 22 is connected to the continuous portion 21 may be used. In this case as well, when the arrow A penetrates the mesh 3, the first thread 22 can be brought into contact with the outer circumference of the arrow A. Therefore, for example, as compared with forming the mesh into a quadrangular rhombus, the contact area between the arrow A and the mesh thread 2 can be increased, and the frictional force applied to the arrow A can be increased.

In each of the above embodiments, the case where the first thread 22 and the second thread 23 facing each other in the one mesh 3 are each composed of the same (one) insertion thread Y has been described, but this is not necessarily the case. It is not limited, and for example, the first thread 22 and the second thread 23 facing each other in the mesh 3 may be composed of different insertion threads or loop threads.

In each of the above embodiments, the insertion thread Y forms the first thread 22 and the second thread 23 in one mesh 3, and the first thread of the other two meshes 3 adjacent to the one mesh 3. Although the case where the yarns form the 22 and the second yarn 23 has been described, the present invention is not necessarily limited to this. For example, one insertion thread may form only the first thread 22 and the second thread 23 in one mesh 3.

That is, one insertion thread knots the lower knot portion 20 of the one mesh 3, and one side (for example, the right side) of the pair of continuous portions 21 connected to the knot portion 20 is connected. Nodule 20 connected to the upper side of the connecting portion 21 through the second thread 23 and the connecting portion 21 connected to the left side of the second thread 23, extending to the left from the setting portion 21. It may be configured to knot. Also in this case, when the arrow A penetrates the mesh 3, the mesh 3 expands, so that the first thread 22 and the second thread 23 pull the knot portion 20 toward the mesh 3, and the mesh when the mesh 3 expands. The rigidity of 3 can be increased.

In each of the above embodiments, the case where the net thread 2 (insertion thread and loop thread) is formed from polyester fiber has been described, but the present invention is not necessarily limited to this, and for example, a synthetic fiber such as nylon fiber or polyethylene fiber is used. There may be.

In each of the above embodiments, the case where the arrowhead nets 1,201 and 301 are arranged on the back side of the target 101 and supported (extended) by the support column 102 and the wire rope 103 has been described, but the present invention is not necessarily limited to this. For example, the arrow nets 1,201 and 301 may be arranged on the side surface or the ceiling surface (plane parallel to the shooting direction) of the shooting range 100. Further, the arrow-proof nets 1,201 and 301 may be hung from the ceiling surface by a support member.

In each of the above embodiments, the case where the arrow-proof nets 1,201,301 are installed in the shooting range 100 for shooting archery has been described, but the present invention is not necessarily limited to this, and for example, the arrow-proof nets 1, 201 and 301 can be adopted in any shooting range as long as they are competitions using arrows. As an example, the arrow nets 1,201,301 may be installed in the archery hall of Yumi.

In each of the above embodiments, the case where the first thread 22 and the second thread 23 facing each other in one mesh 3 are formed from one insertion thread Y has been described, but the present invention is not necessarily limited to this. For example, the first thread 22 and the second thread 23 may be formed from a plurality of insertion threads or loop threads.

In the second embodiment described above, the case where the first arrow-proof net 201A and the second arrow-proof net 201B are formed from the rhombus Russell net has been described, but the present invention is not necessarily limited to this, and the outer circumference of the arrow A is not necessarily limited. Any net may be formed as long as the inner circumference of the mesh is smaller than that of the mesh. Even in this case, when the two nets having different rigidity are attached, the penetrating force of the arrow A can be efficiently absorbed by arranging the highly rigid net on the shooting side.

Further, the thickness of the portion where the pair of knots 20 of the first arrow-proof net 201A are knotted is formed to have a thickness of 15500 decitex or more and 19000 decitex or less, and the fulfillment rate of the net thread 2 is 71% or more and 80%. The second arrow-proof net 201B may be formed from a square Russell net by forming less than or equal to (other configurations are formed with the same configuration as the arrow-proof net 1). In this case, it is preferable to form the net thread 2 of the second arrow-proof net 201B with a thickness of 6000 decitex or more and less than 10000 decitex, and set the fulfillment rate of the net thread 2 to 55% or more and less than 65%. ..

Thereby, for example, when the distance from the shooting position to the target 101 is set to 70 m in the above-mentioned general archery competition, it is possible to prevent the arrow A from penetrating (penetrating) the arrow net 201 (arrow net). It is possible to form an arrow net 201 suitable for general competition while suppressing an excess of the fulfillment rate of 201).

In the second embodiment, the thickness of the portion where the pair of knots 20 of the first arrow net 201A are knotted is formed to be 15500 decitex or more and 19000 decitex or less, and the net thread 2 is enriched. The case where the rate is formed at 71% or more and less than 80% (other configurations are formed with the same configuration as the arrow net 1) has been described, but the present invention is not necessarily limited to this, and for example, the first defense The part where the pair of nodule 20s of the arrow net 201A is knotted is formed with a thickness of 10000 decitex or more and less than 15500 decitex, and the fulfillment rate of the net thread 2 is 65% or more and less than 71% (other configurations are It may be formed (with the same configuration as the arrow net 1).

In this case, the second arrow-proof net 201B is formed from a square Russell net, the net thread 2 is formed with a thickness of 6000 decitex or more and less than 10000 decitex, and the fulfillment rate of the net thread 2 is 55% or more and 65% or more. It is preferable to set it to less than%. Thereby, for example, in the Japanese bow competition, it is possible to prevent the arrow A from penetrating (penetrating) the arrow net 201 (it is suitable for the Japanese bow competition while suppressing the excess of the fulfillment rate of the arrow net 201. The arrow net 201 can be formed).

In the third embodiment, the case where the distance (distance to be separated) between the first arrow-proof net 301A and the second arrow-proof net 301B is set to 500 mm has been described, but the present invention is not necessarily limited to this. For example, the distance (separation distance) between the first arrow-proof net 301A and the second arrow-proof net 301B is preferably set to about 600 mm or less. The "abbreviation" of about 600 mm is defined as a range of 630 mm or less because it is intended to allow a tolerance when the arrow net 301 is attached.

As a result, the distance between the first arrow net 301A and the second arrow net 301B can be adjusted according to the assumed penetration force of the arrow A, so that the installation space occupied by the arrow net 301 is minimized. Can be suppressed to.

Further, since the general arrow A is formed with a length of about 700 mm and the shaft portion of the arrow A is formed in a barrel shape (both ends are thinner than the center of the shaft), the first arrow protection net 301A The frictional force of the arrow A is applied only to the portion from the tip of the arrow A to about 600 mm. Therefore, if the distance between the first arrow-proof net 301A and the second arrow-proof net 301B is longer than about 600 mm, the installation space of the arrow-proof net 301 increases (becomes excessive).

On the other hand, by setting the distance (separation distance) between the first arrow-proof net 301A and the second arrow-proof net 301B to approximately 600 mm or less (that is, in the range of 0 to approximately 600 mm), the arrow A penetrates. The installation cost of the arrow net 301 can be suppressed while efficiently absorbing the force.

1,201,301 Arrow net 2 Net thread 20 Knotting part 21 Continuous part 22 First thread 23 Second thread 102 Strut (support member)
103 Wire rope (support member)
201A, 301A 1st arrow-proof net 201B, 301B 2nd arrow-proof net Y Insert thread constituting the 1st thread and the 2nd thread

Claims (13)

An arrow net formed as a Russell net, comprising a net yarn formed of an insert yarn and a loop yarn made of a raw yarn of a fiber material and a mesh formed as an opening surrounded by the mesh yarn.
The mesh is formed on the diamond eyes,
The net thread connects a knot portion in which the net threads are knotted, a continuous portion in which the knots are connected to each other, and the continuous portions facing each other in the mesh in the first direction. The first thread and the second thread that connects the first thread and the continuous portions facing each other in the mesh in the second direction that is orthogonal to the first direction are provided.
The first thread and the second thread in the mesh are each composed of the same insertion thread.
In the mesh, the first thread and the insertion thread constituting the second thread knot a pair of knots adjacent to the mesh on one side in the first direction, and the mesh on both sides in the second direction. Boya net characterized by nodules to Rukoto a pair of knot portions adjacent to. In the mesh, the first thread and the insertion thread constituting the second thread are the first thread and the second thread in the second mesh adjacent to the mesh in which the first thread and the second thread are formed. forming Boya net according to claim 1, characterized in that. The part of the net thread where the nodules are knotted is formed with a thickness of 10,000 decitex or more and 19000 decitex or less.
The arrow-proof net according to claim 2, wherein the net yarn is formed with a fulfillment rate of 65% or more and 80% or less. A method for manufacturing an arrow net that is knitted by a Russell netting machine and includes a net yarn formed of an insert yarn and a loop yarn made of a raw yarn of a fiber material and a mesh formed as an opening surrounded by the mesh yarn. And
A knitting net step for forming the mesh into a rhombus is provided .
In the knitting net step, the knotted portion in which the net yarns are knotted, the continuous portion in which the knotted portions are connected to each other, and the connected portions facing each other in the mesh in the first direction are connected to each other. The 1st yarn and the 2nd yarn connecting the 1st yarn and the continuous portions facing each other in the mesh in the 2nd direction which is orthogonal to the 1st direction are knitted.
In the knitting step, the first yarn and the second yarn in the mesh are knitted from the same insertion yarn, and the insertion yarn causes a pair of yarns adjacent to the mesh on one side in the first direction. the nodules were nodules method of Boya net characterized by Rukoto to nodules a pair of knot portions adjacent to the mesh on opposite sides in the second direction. In the knitting step, the first yarn is formed in the second mesh adjacent to the mesh in which the first yarn and the insert yarn constituting the second yarn form the first yarn and the second yarn in the mesh. The method for manufacturing an arrow-proof net according to claim 4, wherein the second yarn is knitted. It is provided with a heat treatment step which is performed after the knitting step and heat-treats the knitted net body knitted by the knitting step.
The claim is characterized in that the knitting step is knitting a portion of the net yarn in which the nodule portions are knotted to a thickness of 10,000 decitex or more and 19000 decitex or less by a 10 to 12 gauge Russell netting machine. 5. The method for manufacturing an arrow net according to 5 . The method for manufacturing an arrow net according to claim 6 , wherein the knitting step is knitting with an 11-gauge Russell netting machine. In the mounting structure of the arrow net stretched over the support member,
The first arrow-proof net arranged on the shot side and the back side of the first arrow-proof net opposite to the shot side are arranged and have lower rigidity than the first arrow-proof net. Equipped with a second arrow net
The first arrow-proof net is composed of the arrow-proof net according to claim 3.
The enhancement rate of yarn mesh surrounding the mesh of the second Boya net structure for mounting Boya net characterized by Rukoto formed lower than the enhancement factor of the network yarn of the first Boya net. The attachment structure of the arrow-proof net according to claim 8, wherein the first arrow-proof net and the second arrow-proof net are arranged separately from each other on the shooting side and the back surface side. The mounting structure of the arrow-proof net according to claim 9 , wherein the distance between the first arrow-proof net and the second arrow-proof net is set to about 600 mm or less. The second arrow-proof net is composed of the arrow-proof net according to claim 3 .
The part where the nodule portions of the net thread of the first arrow-proof net are knotted is formed with a thickness of 15500 decitex or more and 19000 decitex or less, and the net thread fulfillment rate is 71% or more and 80% or less. Formed,
The part where the nodule portions of the net thread of the second arrow-proof net are knotted is formed with a thickness of 10,000 decitex or more and less than 15,500 decitex, and the fulfillment rate of the net thread is 65% or more and less than 71%. The attachment structure for an arrow-proof net according to claim 8 , wherein the arrow-proof net is formed. The part where the nodule portions of the net thread of the first arrow-proof net are knotted is formed with a thickness of 15500 decitex or more and 19000 decitex or less, and the fullness rate of the net thread is 71% or more and 80% or less. Formed,
The second arrow-proof net includes a mesh yarn formed of an insertion yarn and a loop yarn made of a raw yarn of a fiber material, and a mesh formed as an opening surrounded by the mesh yarn, and the mesh is a square mesh. Formed as a Russell net,
The claim is characterized in that the net thread of the second arrow-proof net is formed with a thickness of 6000 decitex or more and less than 10000 decitex, and the fulfillment rate of the net thread is 55% or more and less than 65%. The mounting structure of the arrow-proof net described in 8 . The part where the nodule portions of the net thread of the first arrow-proof net are knotted is formed with a thickness of 10,000 decitex or more and less than 15,500 decitex, and the fulfillment rate of the net thread is 65% or more and less than 71%. Formed,
The second arrow-proof net includes a mesh yarn formed of an insertion yarn and a loop yarn made of a raw yarn of a fiber material, and a mesh formed as an opening surrounded by the mesh yarn, and the mesh is a square mesh. Formed as a Russell net,
The claim is characterized in that the net thread of the second arrow-proof net is formed with a thickness of 6000 decitex or more and less than 10000 decitex, and the fulfillment rate of the net thread is 55% or more and less than 65%. The mounting structure of the arrow-proof net described in 8 .

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