BACKGROUND

1. Field of the Invention

The present invention relates to an arrow shaft including a carbon fiber sheet having a transfer layer formed thereon.

2. Discussion of Related Art

Arrows generally consist of an arrow shaft which is a hollow cylinder, an arrowhead mounted on the front end of the arrow shaft, a nock mounted on the rear end of the arrow shaft, and feathers attached to the rear outer circumferential surface of the arrow shaft.

When the arrow is shot repeatedly several times, the paradox phenomenon has a greater effect on the arrow shaft than expected, and the arrow shaft is bent like a bow while changing the direction countless times based on the pressure point (center of gravity) during flight. When the arrow shaft successively experiences this phenomenon, deformation or breakage occurs in the middle part of the arrow shaft, where the center of gravity is located.

At the moment when the arrow is shot from a bow, the archer's paradox phenomenon occurs. In this case, when the strength, weight, length, and the like of the shaft are not appropriate for the strength of the bow, the arrow does not fly straight.

In general, the high strength of the back means that the strength of the arrow, that is, the strength of the back of the arrow, is higher than the strength of the bow, and the low strength of the back means that the strength of the arrow is lower than the strength of the bow.

Therefore, to measure the strength of the shaft, a weight is suspended at the center of the shaft, and the degree of bending is measured. Based on the measurement, a shaft appropriate for the strength of the bow is selected. Here, the degree of bending is referred to as spine.

As the spine of the arrow shaft increases, the arrow flies straight, or there is little deformation of the material caused by frequent occurrence of the paradox phenomenon. However, since the spine of the arrow needs to be determined in consideration of the strength of the bow, it is not necessarily advantageous to unconditionally increase the spine. In addition, increasing the spine of the arrow leads to an increase in material costs and production costs.

Meanwhile, the arrow shaft is subjected to different external forces depending on each position in the longitudinal direction thereof. That is, the middle part of the arrow shaft is frequently subjected to a bending force due to the paradox phenomenon as described above, so it is easy to become weak by long-term use, and the front part of the arrow shaft, on which the arrowhead is mounted, is the part that gets the greatest shock when hitting the target during frequent shooting. On the other hand, the rear part of the arrow shaft, on which the nock is mounted, is the part that gets the greatest shock caused by a bowstring.

Meanwhile, the conventional arrow shafts are manufactured by sequentially laminating a plurality of sheets and winding the laminated sheets around a mandrel. In particular, when the sheets include carbon to reinforce strength, there is a problem in that the visual pattern of the surface layer exposed to the outside of the arrow shaft may be reduced or faded.

The contents described as the background art are merely provided to help in understanding the background of the present invention, and thus it should not be taken as an admission that they correspond to the conventional art already known to those of ordinary skill in the related art.

PRIOR-ART DOCUMENTS

Patent Documents

(Patent Document 0001) Korean Registered Patent No. 10-0131044 (Nov. 26, 1997)

SUMMARY OF THE INVENTION

The present invention is directed to providing an arrow shaft including a carbon fiber sheet with improved visibility, which is formed by arranging and laminating carbon fibers in a specific form on a hollow straight tube and has a plurality of transfer layers formed to allow the pattern of the outermost sheet layer to stand out so that the pattern of the outermost sheet layer may be more clearly visible.

However, the objective of the present invention is not limited to the objective described above, and other objectives not described above will be clearly understood by those skilled in the art from the following description.

The present invention provides an arrow shaft including a carbon fiber sheet having a transfer layer formed thereon, wherein the carbon fiber sheet is formed to extend in one direction and includes a plurality of carbon fiber layers in which a camouflage layer is formed on at least a part of an outermost layer thereof, and at least one transfer layer is formed on one surface of at least one of the carbon fiber layer and the camouflage layer.

According to an embodiment of the present invention, a resin layer may be formed on at least one surface of the camouflage layer and the transfer layer.

According to an embodiment of the present invention, the resin layer may include an adhesive resin at 40 to 50 wt %.

According to an embodiment of the present invention, the transfer layer may include: a film layer; a backing agent applied onto the film layer; a release agent formed on the backing agent; a white and colored background layer formed at least once; and a glue sheet layer formed on the background layer.

According to an embodiment of the present invention, the background layer may include a curing agent at 1 to 5 wt %.

According to an embodiment of the present invention, the transfer layer may have a brightness of 50% or less with respect to 100% of a brightness of the camouflage layer.

According to an embodiment of the present invention, the transfer layer may be formed by performing transfer at least three times, but the present invention is not limited thereto.

According to an embodiment of the present invention, the transfer layer may have a white-white-white color or a white-pattern-pattern color.

According to an embodiment of the present invention, the transfer layer may at least partially include graphene.

According to an embodiment of the present invention, the camouflage layer may include 70 to 90% cotton and 10 to 30% nylon.

According to an embodiment of the present invention, the transfer layer may further include a reflective material.

According to an embodiment of the present invention, carbon fibers in the plurality of carbon fiber layers may be cross-arranged in a direction of 0 to 90 degrees.

The present invention also provides a method of manufacturing the above-described arrow shaft, which includes sequentially forming an adhesive resin layer and a transfer layer on at least one surface of a carbon fiber sheet including a plurality of carbon fiber layers, wherein the formation of the transfer layer includes: applying a backing agent onto at least one surface of a film; forming a release agent on the backing agent; forming a white and colored background layer at least once; and forming a glue sheet layer on the background layer.

According to an embodiment of the present invention, the method may further include forming a camouflage layer on an outer surface of the glue sheet layer of the carbon fiber sheet.

According to an embodiment of the present invention, an adhesive resin layer and a release layer may be sequentially formed on one surface of the camouflage layer.

According to an embodiment of the present invention, the resin layer may include an adhesive resin at 40 to 50 wt %.

Other details of embodiments are included in the detailed description and accompanying drawings.

