JP4910074B1 - Blowing arrow - Google Patents

Abstract

[PROBLEMS] To pull a pin and a film together when removing the arrow from the target, and even in the case of double entry, the pin of the rear arrow is difficult to bite into the film of the front arrow, and in the blowing arrow competition where the center of gravity is closer to the front Provide an arrow to use.
A round pin 4 comprising a round head and a cylindrical portion extending rearward therefrom, the round pin 4 having a cross-sectional diameter smaller than the diameter of the round head, and a conical shape The film 6 is a film 6 wound around the tip of the film 6, the film 6 having all of the cylindrical portions of the round pin 4 inserted into and fixed to the tip, and an arrow 2. A spherical portion is an arrow 2 connected as a weight.
[Selection] Figure 1

Description

  The present invention relates to an arrow used for blowing arrows.

  In recent years, blowing arrows as sports and entertainment have become widespread because breathing when blowing arrows is abdominal breathing and is good for health.

  Blowing arrows for sports and entertainment are performed using an arrow in which a film is wound in a conical shape and a pin as a weight is inserted at the tip of the film. This arrow is inserted into a cylinder and breathed into the cylinder from the rear end of the cylinder. By blowing in, the arrow is fired and applied to the urethane target. As the arrow, a substantially rectangular plastic film is wound in a conical shape, and a nail as a weight is inserted and fixed to the tip from a leg portion (for example, see Patent Document 1). As the nail, a brass or iron round nail is generally used. This conventional arrow has the following three problems.

  First, as shown in FIG. 20, the conventional arrow 24 described above has a shape in which a round nail 26 is inserted into the leading end of the film 28. As shown in FIG. 21, the round nail 26 has a head 29 formed with a bite, and the head 29 is integrally connected with a cylindrical portion 30 that is pointed rearward. Due to the presence of this maple, the following two events often occur.

  1. When removing the target arrow from the target, only the pin of the round nail remains and the film is pulled out.

  2. The next blown arrow enters the cone of the film of the previous arrow (this phenomenon will be referred to as “double entry”), and the head of the round nail It bites into the film (see FIG. 23). In this case, when the back arrow is pulled out, only the film is pulled and the film comes out of the pin of the round nail, and the pin of the back arrow remains in the film of the front arrow.

  In the case of 1 described above, the arrow with the pin removed becomes unusable thereafter. In the case of 2 described above, there are two pins in the film of the front arrow, and there is no pin in the rear arrow, so that neither the front arrow nor the rear arrow can be used.

  Moreover, although the commercially available thing is using the commercially available JIS standard for the round nail, since the main purpose is fixing wood etc., the cylindrical part 30 does not necessarily pass the center of the head 29. It was.

  Furthermore, when the substantially rectangular plastic film disclosed in Patent Document 1 is wound into a conical shape, the film overlap margin 36 at the rear end of the film 28 in the wound state is large as shown in FIG.

  3. With this structure, there was a bias in the center of gravity in the vertical direction, and there was a tendency to stop at the same location when the film was rolled. The deviation of the center of gravity had an effect during the flight of the arrow, causing blurring.

Registered Utility Model Publication No. 3051432

  The present invention has been made in view of such circumstances. 1. When removing the arrow from the target, the pin and film can be pulled out together. 2. Even in the case of a double entry, the pin of the back arrow is difficult to bite into the film of the front arrow. An object of the present invention is to provide an arrow in which the cylindrical portion passes through the center of the head to reduce blur during flight.

  The invention according to claim 1 is an arrow used for blowing arrows, which has been developed to achieve the above object. This arrow is a pin composed of a spherical tip and a cylindrical portion extending rearward from the tip, and the pin has a cross-sectional diameter smaller than the spherical diameter, and is wound in a conical shape. An arrow in which all of the cylindrical part of the pin is inserted and fixed to the tip, and the spherical part of the pin is connected as a weight continuously to the tip of the film, Consists of.

  According to the present invention: Since the tip of the pin has a spherical shape, there is no barb head when removing the pierced arrow from the target, making it easier to pull out the arrow, leaving only the pin and pulling out the film as much as possible. Can be prevented. 2. Even if the next blown arrow overlaps with the arrow that is stabbing and digs deep into the film of the previous arrow and enters a double rush state, only the film is pulled when the back arrow is pulled out and the back film It is possible to prevent as much as possible that the pin comes off from the pin and remains in the film of the previous arrow. 3. The positioning error of the cylindrical part with respect to the central part of the spherical shape can be manufactured very small, and the center of gravity of the entire arrow is also moved forward, so that the blur of the rear end of the film during flight of the arrow is reduced, hitting the target The rate increases.

  In order to achieve the above object, the invention according to claim 2 is an arrow used for a blowing arrow, and is a pin comprising a tip portion having an elliptical longitudinal section and a column portion extending rearward from the tip portion. A pin having a diameter of a cross section of the cylindrical portion smaller than a diameter of a cross section of the elliptical tip portion and a film wound in a conical shape, and the cylindrical portion of the pin is inserted into the tip portion. And an arrow in which the elliptical portion of the pin is connected as a weight continuously to the tip of the film.

  According to the present invention, the vertical section of the pin is connected to the tip of the conical film as a weight. 1. Since the tip of the pin has an elliptical cross section, it is easy to remove the arrow when removing the target arrow from the target, and it is possible to prevent as much as possible from leaving only the pin and pulling out only the film. 2. Even if the next blown arrow overlaps with the arrow that is stabbing and digs deep into the film of the previous arrow and enters a double rush state, only the film is pulled when the back arrow is pulled out and the back film It is possible to prevent as much as possible the situation in which the pin comes off from the pin and remains in the film of the previous arrow. 3. The arrangement error of the cylindrical part with respect to the center part of the ellipse can be manufactured to be extremely small, and the center of gravity of the entire arrow is also closer to the front. The rate increases.

  In the invention according to claim 3, in order to achieve the above object, when the film is wound in a conical shape, the overlap between the end portions in the width direction of the film is 1/5 of the total length of the film from the rear end. The arrow according to claim 1 or 2, wherein the arrow is within 1 cm, gradually widens toward the tip, widest at the center, and gradually overlaps more than double as it goes to the tip. It consists of

  According to the present invention, since the area of the double portion on the back side of the arrow of the film can be reduced as much as possible, the weight of the film can be reduced and the center of gravity of the arrow can be brought forward. Further, since the area where the film is doubled on the back side of the film is reduced, the deviation of the center of gravity in the vertical direction of the arrow is reduced, and the vertical and horizontal blur during flight is reduced.

  In order to achieve the above object, the invention according to claim 4 is configured such that the center of gravity of the arrow exists at a point of 26.2% to 27.0% from the tip of the arrow with respect to the total length of the arrow. 1 arrow.

  According to the present invention, since the center of gravity of the arrow is ahead of the conventional one, the vertical and horizontal blur during the flight of the arrow is reduced, and the target accuracy is improved.

  In order to achieve the object, the invention according to claim 5 is configured such that the center of gravity of the arrow exists at a point of 26.5% to 26.6% from the tip of the arrow with respect to the total length of the arrow. 2 arrows.

  According to the present invention, since the center of gravity of the arrow is ahead of the conventional one, the vertical and horizontal blur during the flight of the arrow is reduced, and the target accuracy is improved.

  The invention according to claim 6 comprises the arrow according to claim 1, wherein the weight of the pin is 0.353 g in order to achieve the object.

  According to the present invention, since the weight of the pin is heavier than that of the conventional nail type, the center of gravity of the arrow is ahead of the conventional one, so that the vertical and horizontal blur during the flight of the arrow is reduced, so The rate will improve.

  The invention according to claim 7 comprises the arrow according to claim 2, wherein the weight of the pin is 0.406 g in order to achieve the object.

  According to the present invention, since the weight of the pin is heavier than that of the conventional nail type, the center of gravity of the arrow is ahead of the conventional one, so that the vertical and horizontal blur during the flight of the arrow is reduced, so The rate will improve.

  The invention according to claim 8 comprises the arrow according to claim 1, wherein the weight of the arrow is 0.797 g ± 0.02 g in order to achieve the object.

  According to the present invention, since the weight of the arrow is almost the same as when a conventional nail type pin is used, the arrow having the effect of claim 1 can be obtained while maintaining the flight performance.

  In order to achieve the above object, the film according to claim 9 is composed of a substantially elongated oriented polypropylene sheet having two long sides facing each other, and one of the long sides is a circle. The arrow according to claim 3, wherein an arc-shaped curved portion is formed at a corner portion that is curved in an arc shape and continues to the long side, and the other of the long sides is formed in a substantially linear shape. Consists of.

  According to the present invention, when the film is wound in a conical shape, the area of the double part on the rear side of the arrow of the film can be reduced as much as possible, so the weight of the film can be reduced and the center of gravity position of the arrow can be set. You can bring it forward. Further, since the area where the film is doubled on the back side of the film is reduced, the deviation of the center of gravity in the vertical direction of the arrow is reduced, and the vertical and horizontal blur during flight is reduced.

  In order to achieve the above object, in the invention according to claim 10, the total length of the arrow is 200 mm ± 5 mm, and the outer diameter of the rear end of the film wound in a conical shape is 13.0 mm ± 0.2 mm. It consists of the arrow of Claim 1.

  According to the present invention, it is possible to obtain the same size as that of the conventional arrow standard while having the features of the first aspect.

  In the invention according to claim 11, in order to achieve the above object, the arrow has a total length of 201 mm ± 5 mm, and the outer diameter of the rear end of the film wound in a conical shape is 13.0 mm ± 0.2 mm. It consists of the arrow of Claim 2.

  According to the present invention, it is possible to obtain the same size as that of the conventional arrow standard while having the characteristics of the second aspect.

  According to the present invention, when the arrow is removed from the target, the pin and the film can be pulled out integrally, and even in the case of double entry, an arrow in which the pin of the rear arrow is difficult to bite into the film of the front arrow can be obtained. Moreover, the arrangement | positioning error of the said cylindrical part with respect to the spherical part or the elliptical center part can be manufactured very small. Furthermore, according to the present invention, it is possible to obtain an arrow having a high hit rate with little blurring during flight, in which the center of gravity in the vertical direction is made uniform and the center of gravity in the longitudinal direction is brought forward.

Vertical section of the arrow of the present invention Round pin side view Oval pin side view Film development Diagram showing film and jig Table showing a comparison of the results of three-stage males skipping a conventional arrow and an arrow of the present invention with a round pin in abdominal breathing in a standing posture A table showing a comparison of the results of three-stage males skipping a conventional arrow and an arrow of the present invention with a round pin in a microphone stand abdominal breathing Table showing a comparison of the results of the first-stage male flying abdominal breathing in a standing posture with a conventional arrow and the arrow of the present invention with a round pin attached Table showing a comparison of the results of the first-stage males skipping the conventional arrow and the arrow of the present invention with a round pin in a microphone stand abdominal breathing Table showing the left and right distribution status of the implementation results of FIGS. FIG. 6 is a bar graph showing the left and right distribution status of the implementation result of FIG. FIG. 7 is a bar graph showing the left and right distribution status of the implementation result of FIG. A graph showing the left and right distribution status of the implementation result of FIG. 8 in a bar graph FIG. 9 is a bar graph showing the left and right distribution status of the implementation result of FIG. A table showing the right and left distribution status of the implementation results of FIG. 10 in terms of accuracy (%) from the center to the diameter size Table showing the ratio of center of gravity of conventional arrows Table showing the center of gravity ratio of arrows with elliptical pins attached to conventional films Table showing the center of gravity ratio of arrows with round pins attached to the film of the present invention A table showing a comparison of the results of a six-stage male who flew a conventional arrow and an arrow of the present invention with an elliptical pin in abdominal breathing in a standing posture Vertical section of a conventional arrow Side view of round nail A view of the rear end of a conventional film wound in a conical shape as seen from the axial direction of the arrow Longitudinal sectional view showing conventional double entry of arrows

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a vertical cross-sectional view showing the configuration of the arrow of the present embodiment.

  As shown in the figure, the arrow 2 comprises a round pin 4 and a film 6 wound in a conical shape.

  As shown in FIG. 2, the round pin 4 includes a spherical round head 8 and a columnar portion 10 that is continuous with the round head 8 and extends rearward from the round head 8. The round pin 4 is made of iron and plated on the surface. The diameter of the cylindrical section 10 is smaller than the diameter of the round head 8. An arrangement error of the cylindrical portion 10 with respect to the center of the cross section of the round head 8 can be suppressed to 1/100 mm or less because of integral molding.

  As shown in FIG. 4, the film 6 is made of a substantially elongated oriented polypropylene sheet having two long sides facing each other. One of the long sides is an arc portion 18 that is curved inwardly in a gentle arc shape. An arcuate curved portion 20 having a steeper curve than the arc portion 18 is formed at a corner portion adjacent to the arc portion 18. A long side facing the arc portion 18 is a straight portion 22 formed in a substantially straight shape. The corners at both ends of the straight line portion 22 are cut off at the corners. Further, the adjacent portion of the arc portion 18 opposite to the curved portion 20 has a shape with a cut corner. The hand side 32 is curved, and the tip side 34 is linear.

  Next, a method for creating the arrow 2 will be described.

  FIG. 5 is a diagram showing a film and a jig used when winding the film. The film 6 is wound into a conical shape using a jig. First, the hand side 32 is wound around a jig. Next, the jig is rotated in the direction of winding the film 6 while holding the wound portion. The most advanced part in the wound state is a state in which the curved part 20 forms a circumference.

  When the film 6 has been wound into a conical shape, the cylindrical portion 10 of the round pin 4 is fully inserted into the tip of the film 6 so that the round head 8 is adjacent to the tip of the film 6. At this time, an adhesive is sucked from the front end of the film 6 to fix the cylindrical portion 10 inside the front end portion of the film 6. As a result, the round pin 4 can be fixed to the film 6.

  When the film 6 is wound in a conical shape, the overlap between the arc portion 18 and the straight portion 22 is within 1 cm at the one fifth portion of the total length of the film 6 from the rear end, but gradually toward the front end. It is widest at the central part in the longitudinal direction and gradually overlaps with increasing distance toward the tip.

  Here, the detailed data of the arrow will be described. The details of the conventional arrow and the details of the arrow of this embodiment are as follows. A conventional arrow is a combination of the above-described round nail and a substantially rectangular film.

  <Details of Conventional Arrows> The following ± values are manufacturing error ranges due to manual manufacturing.

Total length ... 200mm ± 5mm
Hand side outer diameter: 13.0mm ± 0.2mm
Weight: 0.72g ± 0.02g
Weight of round nails ... 0.250g
Center of gravity: 63mm ± 2mm from the tip
<Details of Arrows in this Embodiment> The following ± values are manufacturing error ranges due to manual manufacturing.

Total length ... 200mm ± 5mm
Hand side outer diameter: 13.0mm ± 0.2mm
Weight 0.80g ± 0.02g
Weight of round pin: 0.353g
Center of gravity: 53mm ± 2mm from the tip
In the state in which the conventional substantially rectangular film 28 is wound in a conical shape, the overlap of the rear end portion is large as shown in FIG. 22, but by using the above-mentioned film shape, the overlap as described above. Since the center of gravity in the vertical direction of the film can be made uniform, the blur during flight is reduced and the weight can be reduced.

  By adopting the round pin 4 of the present embodiment, the pin becomes 0.1 g heavier than the conventional round nail 26, but the weight of the film can be reduced, so the arrow as a whole becomes 0.08 g heavier. Only.

  In the present embodiment, the center of gravity in the longitudinal direction of the arrow can be moved toward the tip of the arrow by changing the pin from a conventional round nail to a spherical tip. As a result, the in-flight blur was further reduced, and the target accuracy was improved.

  Here, the results obtained by sampling and examining five arrows actually manufactured for the conventional arrow center of gravity ratio and the arrow center of gravity ratio of the present embodiment will be examined. FIG. 16 is a table showing the result of extracting five conventional arrows 24 and examining the center of gravity ratio, and FIG. 18 is a table showing the result of extracting five arrows 2 of this embodiment and examining the center of gravity ratio. .

  In these tables, “centroid” indicates how many centimeters the center of gravity is from the tip of the arrow. The “ratio” indicates how many percent of the total length of the arrow is from the arrow tip.

  Although there are some individual differences in the conventional example and the present embodiment, the center-of-gravity ratio is such that the arrow 2 of the present embodiment is positioned 5.0% more on the tip side than the conventional arrow 24 on average. ing.

  Next, the result of actually blowing and blowing the conventional arrow and the arrow of this embodiment will be examined. The score is 7 points for 6cm diameter, 5 points for 12cm, 3 points for 18cm, 1 point for 24cm, and 35 points per round. The average score of FIGS. 6-10 is a case where 35 points are perfect marks.

  FIG. 6 is a table showing a comparison of the results of three-stage males taking 100 conventional arrows and new arrows (that is, arrows in this embodiment) by abdominal breathing in a standing posture, and FIG. A table showing a comparison of the results of three-stage males flying 100 conventional arrows and a new-type arrow (that is, the arrows in this embodiment) by abdominal breathing with a microphone stand, FIG. 8 is a first-stage male Fig. 9 is a table showing a comparison of the results of performing 100 standing conventional arrows and 100 new arrows (that is, the arrows in the present embodiment) in a standing abdominal breathing. It is the table | surface which showed the comparison of the implementation result which skipped the conventional type arrow and the new type arrow (namely, arrow of this embodiment) by abdominal respiration. The same person used the same cylinder.

  In the competition, beginners are in the fifth grade, the grades rise as they improve, and the highest grade is in the first grade. The first level is the first level, the level increases as the level improves, and the current top level is 6 levels. That is, the fifth grade, the fourth grade, the third grade, the second grade, the first grade, the first stage, the second stage, the third stage, the fourth stage, the fifth stage, and the sixth stage. Specifically, a line was drawn on a 1 cm square, and the position hit was measured from three viewpoints: score, dispersion, and standard deviation. In addition, the case where the microphone stand was used was measured in order to test whether the aim changes between the conventional type and the new type, and whether the target position changes accordingly.

  As can be seen from FIG. 6, the average score was 0.5 points higher, the variance value was lower, and the standard deviation was smaller when the new type of arrow was used. In other words, it can be seen that when the 100 arrows were skipped, the new arrow showed a slight improvement in the average score, but the rate of gathering from the variance / standard deviation to the center of the target was higher.

  In FIG. 7, even when the microphone stand was used, the average score was 0.5 points higher, the variance value was lower, and the standard deviation was smaller when the new arrow was used. In other words, even when 100 microphones were fixed, the new arrow showed a slight improvement in the average score when flying 100, and the rate of gathering from the variance / standard deviation to the center of the target was higher. .

  As can be seen from Fig. 8, the distance to the target is 8m in the first stage male, but the average score is 2.8 points higher, the variance value is lower, and the standard deviation is smaller when the new arrow is used. It was. In other words, when 100 were skipped, the rate of gathering to the center of the target was significantly improved when using a new type of arrow for those who were close to beginners.

  In FIG. 9, the distance to the target in the first stage male is 8 m, but even when using a microphone stand, the average score is higher by 1.3 points when using the new arrow, the variance value is lower, and the standard The deviation was small. In other words, even if it is fixed with a microphone stand, if it is a person close to a beginner when 100 are skipped, the rate of gathering to the center when using a new arrow is greatly improved.

  In the experiments of FIGS. 6 to 9, double rushing occurred each time (about 30 times), but the pin never pulled out of the film. Also, the pin did not come off from the film when the arrow was removed from the target.

  FIG. 10 is a table showing the left and right distribution statuses of the implementation results of FIGS. 6 to 9, and FIGS. 11 to 14 are diagrams of the implementation results of FIGS. 6, 7, 8, and 9. It is the figure which showed the distribution situation of right and left to to by a bar graph. FIG. 15 is a table showing the right and left distribution states of the implementation result of FIG. 10 in terms of the degree of accuracy (%) from the center to the diameter. In the table, the table shows how much arrows are concentrated within the distance from the center of the target, ie, within 1 cm, 3 cm, 5 cm, 7 cm, 9 cm, 11 cm, 13 cm, 15 cm, and 17 cm. In all conditions, the new model was more centralized than the conventional model. The new model hit with a probability of 90% or more within 5 cm in diameter. Note that the scattering in the vertical direction is greatly influenced by the height of the target and the intensity of the abdominal breathing, and can be said to depend on the speed.

  A modification of the present embodiment will be described.

  In the above-described embodiment, the round pin 4 is used as the pin of the arrow 2, but an elliptical pin 12 can be used instead of the round pin 4. FIG. 3 is a side view of the oval pin 12.

  As shown in FIG. 3, the elliptical pin 12 is continuous with the elliptical head 14 having an elliptical cross section in the longitudinal direction and a circular cross section, and the elliptical head 14, and extends backward from the elliptical head 14. It consists of a cylindrical part 10. The elliptical pin 12 is also made of iron and plated on the surface. The diameter of the cross section of the cylindrical portion 10 is smaller than the diameter of the cross section of the elliptical head 14. The total length of the elliptical pin 12 is 21 mm, and it is 201 mm on average when the film is included. An arrangement error of the cylindrical portion 10 with respect to the center of the cross section of the elliptical head 14 can be suppressed to 1/100 mm or less because of integral molding.

  The details of the arrow of this modification are as follows.

  <Details of Modified Arrow> The following ± values are manufacturing error ranges due to manual manufacturing.

Total length ... 201mm ± 5mm
Hand side outer diameter: 13.0mm ± 0.2mm
Weight 0.89g ± 0.02g
Elliptical pin weight: 0.406g
Position of the center of gravity: 52.8mm ± 2mm from the tip
Here, a result obtained by sampling and examining five arrows actually manufactured for the center-of-gravity ratio of the arrows in this modification will be examined. FIG. 17 is a table showing the results of examining the center-of-gravity ratio by extracting five arrows 16 of this modification. In this example, a conventional film was used.

  In these tables, “centroid” indicates how many centimeters the center of gravity is from the tip of the arrow. The “ratio” indicates how many percent of the total length of the arrow is from the arrow tip. Although there are some individual differences among the five, the ratio of the center of gravity is such that the arrow 16 of the present modification is located 5.1% on the average in the tip direction of the conventional arrow 24. The average weight increased by 0.174 g over the conventional arrow 24.

  The arrow was actually skipped using the arrow 16 of this modification. FIG. 19 is a table showing a comparison of the results of implementation in which a conventional arrow and an arrow of the present variation with an elliptical pin attached were skipped by a 6-tier male abdominal breathing in a standing posture. The implementation was done by measuring how many of the 499 plays were 7 points at a distance of 10 m (the center diameter of the target was 6 cm).

  As a result, the 7-point midpoint rate rose dramatically. As a result, it is understood that the hit rate is considerably improved by simply changing the pin from a round nail to an elliptical pin.

  2 ... arrow, 4 ... round pin, 6 ... film, 8 ... round head, 10 ... cylindrical part, 12 ... elliptic pin, 14 ... elliptical head, 16 ... arrow, 18 ... arc part, 20 ... curved part, 22 ... Linear part

Claims (11)

An arrow used for blowing arrows,
A pin comprising a spherical tip and a cylindrical portion extending rearward from the tip, the pin having a smaller cross-sectional diameter than the spherical diameter;
A film wound in a conical shape, and a film in which all of the cylindrical portion of the pin is inserted and fixed to the tip,
An arrow in which the spherical portion of the pin is connected as a weight continuously to the tip of the film. An arrow used for blowing arrows,
A pin comprising a tip portion having an elliptical longitudinal section and a cylindrical portion extending rearward from the tip portion, wherein the diameter of the cross section of the cylindrical portion is larger than the diameter of the cross section of the tip portion of the elliptical shape. With a small pin,
A film wound in a conical shape, and a film in which all of the cylindrical portion of the pin is inserted and fixed to the tip,
An arrow in which the elliptical portion of the pin is connected as a weight continuously to the tip of the film.   When the film is wound in a conical shape, the overlap between the end portions in the width direction of the film is within 1 cm at the one fifth portion of the total length of the film from the rear end, and gradually widens toward the front end. The arrow according to claim 1 or 2, wherein the arrow is widest at the center and gradually overlaps more than double as it goes to the tip.   The arrow of Claim 1 comprised so that the gravity center of an arrow might exist in the point of 26.2%-27.0% from the front-end | tip of an arrow with respect to the full length of an arrow.   The arrow of Claim 2 comprised so that the gravity center of an arrow might exist in a point of 26.5%-26.6% from the front-end | tip of an arrow with respect to the full length of an arrow.   The arrow according to claim 1, wherein the weight of the pin is 0.353 g.   The arrow according to claim 2, wherein the weight of the pin is 0.406 g.   The arrow according to claim 1, wherein the weight of the arrow is 0.797 g ± 0.02 g.   The film is formed of a substantially elongated oriented polypropylene sheet having two long sides facing each other, and one of the long sides is curved in an arc shape and further on a corner adjacent to the long side. The arrow according to claim 3, wherein an arcuate curved portion is formed, and the other of the long sides is formed in a substantially linear shape.   The arrow according to claim 1, wherein the arrow has an overall length of 200 mm ± 5 mm and an outer diameter of a rear end of the film wound in a conical shape is 13.0 mm ± 0.2 mm.   3. The arrow according to claim 2, wherein the arrow has an overall length of 201 mm ± 5 mm and an outer diameter of a rear end of the film wound in a conical shape is 13.0 mm ± 0.2 mm.

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