Fishing rod

Abstract

To provide a fishing rod which has difficulty in bending by laminating on a carbon solid core material a glass fiber layer, a carbon fiber layer, and a glass fiber layer, further suppresses release of the carbon fiber of the carbon solid core material and release of the laminated carbon fiber layer, and suppresses breakage such as deformation and fracture.SOLUTION: A fishing rod 1 includes: a tapered carbon solid core material 1a molded from carbon fiber and whose diameter reduces along a longitudinal direction; a first glass fiber layer 3 formed on an outer peripheral surface from an end part to a rear end part of the carbon solid core material; a first carbon fiber layer 4 formed on an outer peripheral surface of the first glass fiber layer of at least one of an end part, a middle part and a rear end part of the carbon solid core material; and a second glass fiber layer 5 formed on the outer peripheral surface of the first carbon fiber layer.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a fishing rod, and more particularly to a fishing rod that includes a carbon solid core material and has a fiber reinforced layer formed on the outer periphery thereof. [Background technology]

[0002] In terms of material, fishing rods are divided into glass rods (fishing rods made of glass fiber reinforced plastic) and carbon rods (fishing rods made of carbon fiber reinforced plastic), and in terms of shape, they are divided into rods with a circular hollow cross-section structure (tubular rods) and solid rods with a circular solid cross-section structure.

[0003] The glass rod and the carbon rod are selected depending on the target fish or the user's preference, but generally, carbon rods are more widely used because they have stronger tension and are lighter than glass rods.

[0004] Conventional carbon fishing rods have a risk of breaking if the rigidity (tension) of the carbon rod is excessively high. Therefore, in order to prevent breakage of fishing rods (carbon rods), Patent Document 1 proposes a carbon fishing rod that has excellent bending strength and impact resistance. Specifically, Patent Document 1 discloses a fishing rod that has superior bending strength and impact resistance compared to conventional fishing rods by laminating multiple carbon layers in mutually intersecting directions on a carbon fiber solid core material.

[0005] Specifically, as shown in FIG. 9 , a fishing rod 50 comprises a tapered solid core material 51 made of carbon fiber and having a diameter that gradually decreases along the longitudinal direction, a forward-inclined carbon layer 52 in which carbon yarn is wound around the solid core material and laminated so that it forms an angle of 30° to 50° with the longitudinal direction, and a reverse-inclined carbon layer 53 in which carbon yarn is wound around the forward-inclined carbon layer and laminated so that it forms an angle of 30° to 50° in the opposite direction to the longitudinal direction, symmetrically to the carbon yarn of the forward-inclined carbon layer, and further comprises a horizontal carbon layer 54 and a vertical carbon layer 55 laminated on the reverse-inclined carbon layer 53.

[0006] The fishing rod disclosed in Patent Document 1 uses a carbon solid formed from carbon fiber as the core material, which allows it to obtain an appropriate amount of tension (resistance to bending). Moreover, because the fishing rod disclosed in Patent Document 1 has laminated carbon layers, it also has improved bending strength compared to a carbon fishing rod of the same diameter. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-11848 Summary of the Invention [Problem to be solved by the invention]

[0008] However, when a fishing rod having a carbon fiber layer laminated on the outer surface of a carbon solid core material is subjected to a large load on the rod tip and the rod bends significantly, the carbon fibers in the carbon solid core material may break and peel off. Also, the fibers in the laminated carbon fiber layer may break and peel off. In extreme cases, the fishing rod may be deformed, broken, or otherwise damaged. There is also a social demand for fishing rods that have adequate tension (resistance to bending).

[0009] The inventors decided to use a carbon solid core material for fishing rods because a carbon solid core material has greater tensile strength (less bending resistance) than a glass solid core material. The researchers then conducted extensive research into improving bending strength by laminating a carbon layer on a carbon solid core material, as well as preventing the carbon fiber from peeling off from the carbon solid core material and the laminated carbon fiber layer. The present inventors have discovered that peeling of carbon fibers from the carbon solid core material can be prevented by forming a glass fiber layer on the carbon solid core material, and that peeling of stacked carbon fiber layers can be prevented by forming a glass fiber layer between the carbon fiber layers and by forming a glass fiber layer on the outermost carbon fiber layer, and have completed the present invention. Furthermore, the inventors discovered that by laminating a carbon fiber layer and a glass fiber layer on top of a glass fiber layer, the bending strength can be improved, and a fishing rod with appropriate bending resistance can be obtained, and thus completed the present invention.

[0010] The present invention was made under these circumstances, and aims to provide a fishing rod that is difficult to bend by laminating a glass fiber layer, a carbon fiber layer, and a glass fiber layer on a carbon solid core material, and further suppresses peeling of the carbon fiber of the carbon solid core material and the laminated carbon fiber layers, thereby suppressing damage such as deformation and breakage. [Means for solving the problem]

[0011] The fishing rod of the present invention, which has been made to solve the above problems, is characterized by comprising: a carbon solid core material formed from carbon fiber and having a tapered shape with a diameter decreasing along the longitudinal direction; a first glass fiber layer formed on the outer peripheral surface of the carbon solid core material from the tip portion to the rear end portion; a first carbon fiber layer formed on the outer peripheral surface of the first glass fiber layer in at least a portion of the tip portion, middle portion, and rear end portion of the carbon solid core material; and a second glass fiber layer formed on the outer peripheral surface of the first carbon fiber layer.

[0012] In this way, the tapered carbon solid core material, which is formed from carbon fiber and has a diameter that decreases along the length, provides a moderate amount of tension (resistance to bending). In addition, the first glass fiber layer is formed on the outer peripheral surface of the carbon solid core from the tip to the rear end, which further prevents the carbon fibers from peeling off from the carbon solid core, and further prevents damage such as deformation and breakage of the fishing rod.

[0013] In particular, since the carbon solid core material includes a first carbon fiber layer formed on the outer surface of the first glass fiber layer in at least a portion of the tip, middle, and rear end portions, and a second glass fiber layer formed on the outer surface of the first carbon fiber layer, the bending strength of the portion where the first carbon fiber layer is formed can be increased. Note that "at least a part of the leading end portion, intermediate portion, and trailing end portion" means not only the leading end portion, intermediate portion, and trailing end portion, but also a part of the leading end portion, a part of the intermediate portion, and a part of the trailing end portion. Furthermore, since the first carbon fiber layer is sandwiched between the first glass fiber layer and the second glass fiber layer, peeling of the laminated first carbon fiber layer can be suppressed, and deformation, breakage, etc. of the fishing rod can be prevented.

[0014] Here, it is desirable that the thickness of the first glass fiber layer increases from the tip end portion to the rear end portion of the carbon solid core material. In other words, when a load acts on the tip of the fishing rod, the rear end portion of the carbon solid core material (the rear end portion of the fishing rod) where a large bending moment force acts is formed with a thick first glass fiber layer, which further prevents the carbon fibers from peeling off from the carbon solid core material, and further prevents damage such as deformation and breakage of the fishing rod.

[0015] It is also desirable that the first carbon fiber layer formed on the outer peripheral surface of the first glass fiber layer and the second glass fiber layer formed on the outer peripheral surface of the first carbon fiber layer are formed over the entire portion of the carbon solid core material from the tip end portion to the rear end portion. The bending strength of the entire fishing rod can be increased, peeling of the carbon fibers can be further suppressed, and damage such as deformation and breakage of the fishing rod can be further suppressed.

[0016] It is also desirable that the thickness of the second glass fiber layer is at least equal to or greater than the thickness of the first carbon fiber layer. If the thickness of the second glass fiber layer is thinner than the thickness of the first carbon fiber layer, the second glass fiber layer cannot prevent the carbon fibers of the first carbon fiber layer from peeling off, and damage such as deformation and breakage of the fishing rod cannot be prevented, which is undesirable.

[0017] It is also desirable that the bearing includes a second carbon fiber layer formed on the outer peripheral surface of the second glass fiber layer, and a third glass fiber layer formed on the outer peripheral surface of the second carbon layer. The bending strength of the portion where the second carbon fiber layer and the third glass fiber layer are formed can be increased, peeling of the carbon fiber can be more effectively prevented, and damage such as deformation and breakage of the fishing rod can be more effectively prevented.

[0018] Furthermore, it is desirable that the thickness of the first carbon fiber layer, the thickness of the second glass fiber layer, the thickness of the second carbon fiber layer, and the thickness of the third glass fiber layer are the same. By making the thickness of the first carbon fiber layer, the thickness of the second glass fiber layer, the thickness of the second carbon fiber layer, and the thickness of the third glass fiber layer the same, peeling of the carbon fibers of the first and third carbon fiber layers can be suppressed, and damage such as deformation and breakage of the fishing rod can be further suppressed. The second carbon fiber layer and the third glass fiber layer may be repeatedly laminated.

[0019] Furthermore, it is desirable that carbon tape be wound in one direction on the outermost glass fiber layer formed on the carbon solid core material at an angle of 35 to 45 degrees relative to the axis of the carbon solid core material, and also wound in the opposite direction to the winding direction at an angle of 35 to 45 degrees relative to the axis of the carbon solid core material. When the carbon tape is wound in this manner, the carbon tape resists the torsion acting on the fishing rod (the force that rotates around the axis of the fishing rod), making the fishing rod resistant to torsion. [Effects of the Invention]

[0020] According to the present invention, by laminating a glass fiber layer, a carbon fiber layer, and a glass fiber layer on a carbon solid core material, it is possible to obtain a fishing rod that is difficult to bend, and further, peeling of the carbon fibers of the carbon solid core material and peeling of the laminated carbon fiber layers are suppressed, thereby suppressing damage such as deformation and breakage. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 1 is a diagram showing a fishing rod according to one embodiment of the present invention. [Figure 2] 2A and 2B are cross-sectional views shown in FIG. 1, in which (a) is a cross-sectional view taken along line II of the tip of the fishing rod, (b) is a cross-sectional view taken along line II-II of the middle part of the fishing rod, and (c) is a cross-sectional view taken along line III-III of the rear end of the fishing rod. [Figure 3] FIG. 3 is a diagram showing the state in which the carbon tape is wound. [Figure 4] FIG. 4 is a diagram for explaining the torsion acting on a fishing rod. [Figure 5] FIG. 5 is a diagram showing a method for manufacturing a fishing rod according to the present invention. [Figure 6] FIG. 6 is a diagram showing the bent state of Comparative Example 1. [Figure 7] FIG. 7 is a diagram showing the state of bending in the embodiment. [Figure 8] FIG. 8 is a diagram showing the state of bending in Comparative Example 2. [Figure 9] FIG. 9 is a diagram showing the structure of a conventional fishing rod. DETAILED DESCRIPTION OF THE INVENTION

[0022] An embodiment of a fishing rod according to the present invention will be described with reference to the drawings. Note that the drawings are schematic illustrations for ease of understanding, and do not represent the actual shape or dimensions. FIG. 1 is a diagram showing a fishing rod according to one embodiment of the present invention, and FIG. 2 is a cross-sectional view shown in FIG. 1, in which (a) is a cross-sectional view taken along line II of the tip of the fishing rod, (b) is a cross-sectional view taken along line II-II of the middle part of the fishing rod, and (c) is a cross-sectional view taken along line III-III of the rear end of the fishing rod. In this embodiment, a case will be described in which a first carbon fiber layer and a second glass fiber layer are formed on the outer peripheral surface of the first glass fiber layer at the rear end portion of the carbon solid core material.

[0023] 1 and 2, a carbon solid core material 1a is provided in the center of a fishing rod 1 according to an embodiment of the present invention. The carbon solid core material 1a is formed by molding a resin containing carbon fiber, and is formed in a tapered shape with a diameter that gradually decreases along the longitudinal direction from the rear end to the tip end.

[0024] A first glass fiber layer 3 is formed on the outer peripheral surface of the carbon solid core 1a from the front end to the rear end. The thickness of the first glass fiber layer 3 increases from the tip portion L1 of the carbon solid core 1a toward the rear end portion L3, and is formed to be the thickest at the rear end of the carbon solid core 1a.

[0025] The first glass fiber layer 3 is formed by laminating a plurality of glass fiber prepregs. The glass fiber prepregs are composite materials made by impregnating glass fiber sheets with resin, and are raw materials for forming fiber-reinforced plastics. Known glass fiber prepregs can be used.

[0026] Furthermore, since the glass fiber prepreg has a constant thickness, in order to increase the thickness of the first glass fiber layer, the number of glass fiber prepregs wound around the carbon solid core material 1a is increased from the tip end to the rear end of the carbon solid core material 1a. For example, as shown in FIG. 2(a), the first glass fiber layer 3 at the tip portion L1 of the carbon solid core 1a is formed from a single sheet of glass fiber prepreg. As shown in FIG. 2(b), the first glass fiber layer 3 in the middle portion L2 of the carbon solid core 1a is formed from three sheets of glass fiber prepreg. Furthermore, as shown in FIG. 2(c), the first glass fiber layer 3 in the rear end portion L3 of the carbon solid core 1a is formed from five sheets of glass fiber prepreg.

[0027] When the glass fiber prepreg is glass fiber impregnated with a thermoplastic resin, it softens when heated and hardens when cooled to form the first glass fiber layer 3. When the glass fiber prepreg is glass fiber impregnated with a thermosetting resin, it hardens when heated to form the first glass fiber layer 3. In the fishing rod according to the present invention, any type of glass fiber prepreg can be used.

[0028] In this way, the first glass fiber layer 3 is formed on the outer peripheral surface of the carbon solid core material 1a from the front end to the rear end, so that breakage of the carbon fibers of the carbon solid core material 1a can be suppressed.

[0029] Furthermore, as shown in Figure 2(c), a first carbon fiber layer 4 is formed on the outer peripheral surface of the first glass fiber layer 3 of the carbon solid core material 1a. This first carbon fiber layer 4 is formed from a single carbon fiber prepreg. The carbon fiber prepreg is a composite material made by impregnating a sheet of carbon fiber with resin, and is a raw material for forming fiber reinforced plastics, and any known material can be used.

[0030] For example, when the carbon fiber prepreg is carbon fiber impregnated with a thermoplastic resin, it softens when heated and hardens when cooled to form the first carbon fiber layer 4. When the carbon fiber prepreg is carbon fiber impregnated with a thermosetting resin, it hardens when heated to form the first carbon fiber layer 4.

[0031] Furthermore, a second glass fiber layer 5 is formed on the outer peripheral surface of the first carbon fiber layer 4 of the carbon solid core material 1a. The second glass fiber layer 5 is formed from a single glass fiber prepreg. The same glass fiber prepreg as that forming the first glass fiber layer 3 is used as the second glass fiber prepreg.

[0032] Furthermore, a second carbon fiber layer 6 is formed on the outer peripheral surface of the second glass fiber layer 5. This second carbon layer 6 is formed from a single carbon fiber prepreg. This carbon fiber prepreg is the same as the carbon fiber prepreg that forms the first carbon fiber layer 4.

[0033] Furthermore, a third glass fiber layer 7 is formed on the outer peripheral surface of the second carbon fiber layer 6 . The third glass fiber layer 7 is formed from a single glass fiber prepreg. The same glass fiber prepreg as that forming the first glass fiber layer 3 is used as this glass fiber prepreg.

[0034] The carbon fiber layers and glass fiber layers described above are formed by winding carbon fiber prepregs and glass fiber prepregs around the carbon solid core material 1a and then applying heat. Furthermore, by applying heat, the carbon fiber layer and the glass fiber layer are brought into close contact with each other, and the carbon solid core material 1a, the carbon fiber layer, and the glass fiber layer are integrated into one body.

[0035] In this way, by forming the second glass fiber layer 5 on the outer surface of the first carbon fiber layer 4 of the carbon solid core material 1a, the first carbon fiber layer 4 is sandwiched between the first glass fiber layer 3 and the second glass fiber layer 5, and peeling of the first carbon fiber layer 4 is suppressed. Furthermore, by forming the third glass fiber layer 7 on the outer peripheral surface of the second carbon fiber layer 6, the second carbon fiber layer 6 is sandwiched between the second glass fiber layer 5 and the third glass fiber layer 7, which suppresses peeling of the second carbon fiber layer 6 and prevents deformation, breakage, etc. of the fishing rod. In particular, deformation, breakage, etc. of the butt end of the fishing rod can be suppressed.

[0036] In this embodiment, the carbon fiber layer and the glass fiber layer are each laminated twice, but the present invention is not limited to this, and the first carbon fiber layer 4 and the second glass fiber layer 5 may be formed on the outer peripheral surface of the first glass fiber layer 3. The carbon fiber layer and the glass fiber layer may each be laminated three or more times.

[0037] Furthermore, as shown in FIG. 3, a carbon tape 2 (2A) is wound in one direction on the outer peripheral surfaces of the first glass fiber layer 3 and the third glass fiber layer 7 (the outermost glass fiber layer of the fishing rod) at an angle θ1 of 35 to 45 degrees relative to the axis of the carbon solid core material 1a. Furthermore, a carbon tape 2 (2B) is wound in the opposite direction to the winding direction at an angle θ2 of 35 to 45 degrees with respect to the axis of the carbon solid core material 1a. The carbon tape is, for example, a tape made by cutting a unidirectional carbon fiber prepreg to a predetermined width, and a carbon tape manufactured by Toray Industries, Inc. can be used.

[0038] In this way, the carbon tape 2 is wound in both forward and reverse directions at an angle of 35 to 45 degrees relative to the axis of the carbon solid core material 1a. Therefore, as shown in FIG. 4, when a twist in both forward and reverse directions acts on the fishing rod 1 (a force that rotates in the X and Y directions around the axis of the fishing rod as the center O), the carbon tape 2 resists the force, making the fishing rod resistant to twisting.

[0039] Here, if the angle of the carbon tape 2 with respect to the axis of the carbon solid core material 1a is less than 35 degrees, the number of turns of the carbon tape 2 will increase, which is not preferable because it will make the fishing rod heavy. On the other hand, if the angle is more than 45 degrees with respect to the axis of the carbon solid core material 1a, the force that resists the rotational forces in the X and Y directions around the axis 1a of the fishing rod 1 will be weak, making the fishing rod weak against twisting, which is not preferable.

[0040] The fishing rod of the present invention having the above-described configuration is formed from carbon fiber and uses a tapered carbon solid core material 1a whose diameter decreases along the longitudinal direction, thereby achieving a moderate tension (difficulty in bending). Furthermore, since the first glass fiber layer 3 is formed on the carbon solid core 1a, peeling of the carbon fibers from the carbon solid core 1a can be further suppressed, and damage such as deformation and breakage of the fishing rod can be further suppressed. In particular, since the first glass fiber layer 3 is formed thickly at the rear end portion of the carbon solid core material 1a (the rear end portion of the fishing rod) where force acts on the tip and a large bending moment force acts, peeling of the carbon fibers from the carbon solid core material 1a can be further suppressed, and damage such as deformation and breakage of the fishing rod can be further suppressed.

[0041] Furthermore, since the first carbon fiber layer 4 is formed on the outer peripheral surface of the first glass fiber layer 3 and the second glass fiber layer 5 is formed on the outer peripheral surface of the first carbon fiber layer 4, the mechanical strength of the rear end of the fishing rod can be increased. Moreover, since the first carbon fiber layer 4 is sandwiched between the first glass fiber layer 3 and the second glass fiber layer 5, peeling of the laminated first carbon fiber layer 4 can be suppressed, and deformation, breakage, etc. of the rear end of the fishing rod can be prevented.

[0042] Similarly, since the second carbon fiber layer 6 is formed on the outer peripheral surface of the second glass fiber layer 5 and the third glass fiber layer 7 is formed on the outer peripheral surface of the second carbon fiber layer 6, the mechanical strength of the rear end of the fishing rod can be further increased. Moreover, since the second carbon fiber layer 6 is sandwiched between the second glass fiber layer 5 and the third glass fiber layer 7, peeling of the laminated second carbon fiber layer 6 can be suppressed, and deformation, breakage, etc. of the rear end of the fishing rod can be prevented.

[0043] In the above embodiment, the first carbon fiber layer 4, the second glass fiber layer 5, the second carbon fiber layer 6, and the third glass fiber layer 7 are formed at the rear end of the carbon solid core material (fishing rod). However, in the present invention, the first carbon fiber layer 4, the second glass fiber layer 5, the second carbon fiber layer 6, and the third glass fiber layer 7 are not limited to being formed at the rear end of the carbon solid core (fishing rod), but may be formed over the entire carbon solid core (fishing rod). In addition, the present invention may be formed on any part of the tip portion L1, the middle portion L2, or the rear end portion L3, or may be formed on a part of the tip portion L1, a part of the middle portion L2, or a part of the rear end portion L3 of the carbon solid core material.

[0044] In particular, since the rear end portion L3 is subject to strong bending, it is preferable to form the first carbon fiber layer 4, the second glass fiber layer 5, the second carbon fiber layer 6, and the third glass fiber layer 7 in the rear end portion L3. Furthermore, if it is desired to increase the tension of the fishing rod, it is preferable to form a first carbon fiber layer 4, a second glass fiber layer 5, a second carbon fiber layer 6, and a third glass fiber layer 7 in the tip portion L1 and the middle portion L2.

[0045] Next, a method for manufacturing a fishing rod according to the present invention will be described with reference to Fig. 5. In Fig. 5, S1 to S13 indicate the order of steps. First, a carbon solid core material 1a is prepared (S1) as shown in Fig. 5. This carbon solid core material 1a is made of carbon fiber and formed into a tapered shape in which the diameter decreases toward the tip along the longitudinal direction. This carbon solid core material 1a can be manufactured by a commonly known manufacturing method.

[0046] Next, glass fiber prepreg is wound around the produced carbon solid core material 1a (S2 to S6). The glass fiber prepreg is a sheet-like material made by impregnating reinforcing glass fibers cut into a predetermined shape with synthetic resin, and any known glass fiber prepreg can be used.

[0047] First, in the glass fiber prepreg 10 wound around the carbon solid core material 1a, the tip portion of the rectangular prepreg is cut obliquely to form a tapered portion 10a. That is, the tip edge 10b of the glass fiber prepreg 10 is cut obliquely from approximately 1 / 3 of the way from the side edge 10d toward a specific point 10e on the side edge 10d beyond the tip end L1, forming the tapered portion 10a.

[0048] As a result, when the glass fiber prepreg 10 is wound around the carbon solid core material 1a from one side edge 10c to the other side edge 10d, the wound layer of the glass fiber prepreg 10 at the tip side of the carbon solid core material is thin due to the portion where the tapered portion 10a is formed (the portion with a narrow width), and the wound layer gradually becomes thicker. Then, a wound layer of glass fiber prepreg 10 is formed with a constant thickness in the region of the middle portion L2 and the region of the rear end portion L3 on the carbon solid core material.

[0049] The distance from the tip L1 to the specific point 10e affects the rigidity of the rod. In other words, when the distance from the tip end L1 to the specific point 10e becomes longer, the laminated portion of the glass fiber prepreg (described later) wound after the glass fiber prepreg 10 becomes shorter, weakening the rigidity of the rod. On the other hand, when the distance from the tip end L1 to the specific point 10e becomes shorter, the laminated portion of the glass fiber prepreg (described later) wound after the glass fiber prepreg 10 becomes longer, strengthening the rigidity of the rod. Therefore, it is necessary to determine the position of the specific point 10e taking into consideration the rigidity of the fishing rod.

[0050] Next, a glass fiber prepreg 11 is prepared (S3) to be wound around the glass fiber prepreg 10. The length of this glass fiber prepreg 11 (the dimension from the front end 11b to the rear end 11f) corresponds to the dimension from the rear end 10f of the glass fiber prepreg 10 to a specific point 10e.

[0051] This glass fiber prepreg 11 does not have the edge at the tip like the glass fiber prepreg 10, but has a corner tip 11b, and the tip portion of the rectangular prepreg is cut obliquely to form a tapered portion 11a. The distance to the specific point 11e that forms the tapered portion 11a affects the rigidity of the fishing rod in the same way as the specific point 10e, so the position of the specific point 11e must be determined taking the rigidity of the fishing rod into consideration.

[0052] Then, the tip (corner) 11b of the glass fiber prepreg 11 is aligned with the end (specific point 10e) of the tapered portion 10a of the glass fiber prepreg 10. After that, the glass fiber prepreg 11 is wound around the carbon solid core material 1a from one side 11c of the glass fiber prepreg 11 to the other side 11d of the glass fiber prepreg 11. As a result, the wound layer of glass fiber prepreg 11 at the tip end of carbon solid core 1a is thin in the portion where tapered portion 11a is formed (narrow portion), and the wound layer gradually becomes thicker.The wound layer of glass fiber prepreg 11 is formed at a constant thickness in part of the middle portion and the rear end portion of carbon solid core 1a.

[0053] Furthermore, a glass fiber prepreg 12 is prepared in which a tapered portion 12a starts from a position corresponding to the end (specific point 11e) of the tapered portion 11a of the glass fiber prepreg 11 (S4). Then, the tip (corner 12b) of the glass fiber prepreg 12 is aligned with the end (specific point 11e) of the tapered portion 11a of the glass fiber prepreg 11, and the glass fiber prepreg 12 is wound around the carbon solid core material 1a from one side 12c to the other side 12d. As a result, the wound layer of glass fiber prepreg 12 at the tip end is thin in the portion where tapered portion 12a is formed (the portion with a narrow width), and the wound layer gradually becomes thicker.The wound layer of glass fiber prepreg 12 is formed at a constant thickness in part of the middle portion and the rear end portion of the carbon solid core material 1a.

[0054] Similarly, glass fiber prepreg 13 is prepared and wound in such a manner that tapered portion 13a starts from a position corresponding to the end (specific point 12e) of tapered portion 12a of glass fiber prepreg 12 (S5). Also, a glass fiber prepreg 14 having a tapered portion 14a starting from a position corresponding to the end (specific point 13e) of the tapered portion 13a of the glass fiber prepreg 13 is prepared and wound (S6).

[0055] In this way, when the glass fiber prepregs 10 to 14 are wound around the carbon solid core material 1a, the tip portion L1 of the carbon solid core material 1a is not wound with the glass fiber prepregs 11 to 14 (only the glass fiber prepreg 10 is wound around it), so the wound layer of the glass fiber prepreg is thin. On the other hand, the glass fiber prepregs 10, 11, and 12 are wound around the middle portion L2 of the carbon solid core 1a, and therefore the wound layer of the glass fiber prepreg is thicker than that on the tip side. Furthermore, the rear end portion L3 of the carbon solid core 1a is wound with glass fiber prepregs 13 and 14, and the wound layer of glass fiber prepregs is thicker than that of the intermediate portion L2.

[0056] In this way, the wound layers of the glass fiber prepregs 10 to 14 become thicker from the front end of the carbon solid core 1a to the rear end of the carbon solid core 1a. That is, the thickness of the first glass fiber layer 3 formed by the glass fiber prepregs 10 to 14 increases from the front end to the rear end of the carbon solid core material 1a, and is formed to be the thickest at the rear end portion L3 of the carbon solid core material 1a.

[0057] Furthermore, as shown in FIG. 5, at the rear end portion L3 of the carbon solid core material 1a, a carbon fiber prepreg 15 is wound around the outer peripheral surface of the glass fiber prepreg 14 (S7). That is, a tapered portion 15a is formed at the tip portion of the carbon fiber prepreg 15, and the carbon fiber prepreg 15 is wound so that the tip 15b of the carbon fiber prepreg 15 is aligned with a specific point 14e of the glass fiber prepreg 14 and the rear end 15b of the carbon fiber prepreg 15 is positioned at the rear end of the glass fiber prepreg 14.

[0058] Furthermore, a glass fiber prepreg 16 is wound around the outer peripheral surface of the carbon fiber prepreg 15 (S8). That is, a tapered portion 16a is formed at the tip portion of the glass fiber prepreg 16, and the carbon fiber prepreg 16 is wound so that the tip 16b of the carbon fiber prepreg 16 is aligned with a specific point 14e of the glass fiber prepreg 14 and the rear end 16b of the glass fiber prepreg 16 is positioned at the rear end 15b of the carbon fiber prepreg 15.

[0059] Similarly, at the rear end portion L3 of the carbon solid core material 1a, a carbon fiber prepreg 17 is wound around the outer peripheral surface of the glass fiber prepreg 16 (S9). That is, a tapered portion 17a is formed at the tip portion of the carbon fiber prepreg 17, and the carbon fiber prepreg 17 is wound so that the tip 17b of the carbon fiber prepreg 17 is aligned with a specific point 16e of the glass fiber prepreg 16 and the rear end 17b of the carbon fiber prepreg 17 is positioned at the rear end 16b of the glass fiber prepreg 16.

[0060] Furthermore, at the rear end portion L3 of the carbon solid core material 1a, a glass fiber prepreg 18 is wound around the outer peripheral surface of the carbon prepreg 17 (S10). That is, a tapered portion 18a is formed at the tip portion of the glass fiber prepreg 18, and the carbon fiber prepreg 18 is wound so that the tip 18b of the carbon fiber prepreg 18 is aligned with a specific point 17e of the glass fiber prepreg 17 and the rear end 18b of the glass fiber prepreg 18 is positioned at the rear end 17b of the carbon fiber prepreg 17.

[0061] In this way, the carbon fiber prepregs 15, 17 and the glass fiber prepregs 16, 18 are alternately wound around the rear end portion L3 of the carbon solid core 1a. That is, the glass fiber layers 5, 7 are formed to sandwich the carbon fiber layers 4, 6 at the rear end portion of the carbon solid core 1a.

[0062] In the carbon solid core material thus constructed, in which the carbon fiber prepreg and the glass fiber prepreg are wound, the glass fiber prepreg is formed to cover the entire outer peripheral surface.

[0063] Next, the carbon tape 2 is wound in one direction on the glass fiber layer on the entire outer circumferential surface at an angle of 35 to 45 degrees with respect to the axis of the carbon solid core material 1a. Further, the carbon tape 2 is wound in the opposite direction to the winding direction at an angle of 35 to 45 degrees with respect to the axis of the carbon solid core material 1a (S11).

[0064] Then, the carbon fiber prepregs 15, 17 and the glass fiber prepregs 16, 18 that protrude from the rear end of the carbon solid core material 1a are cut off, and the rear end portion of the carbon solid core material 1a is cut off and processed to a predetermined size (S12).

[0065] Thereafter, the carbon solid core material 1a around which the carbon fiber prepreg, the glass fiber prepreg, and the carbon tape are wound is subjected to a heat treatment (S13). This heat treatment differs depending on the synthetic resin that constitutes the prepreg, but typically the heating temperature is 120°C to 130°C and the treatment time is about 2 to 3 hours.

[0066] In the case of heat-curing prepregs, the synthetic resin impregnated in the carbon fiber prepreg and glass fiber prepreg softens in the early stage of the heating step, and air trapped during winding and gas generated by heating are released to the outside. At this time, the carbon fiber prepreg, glass fiber prepreg, and carbon tape are integrated, and the carbon fiber layer, glass fiber layer, and carbon tape are integrated. When the heating in the heat treatment step is continued, the synthetic resin impregnated in the prepreg hardens, the shape is fixed, and the rod is completed. [Example]

[0067] As Example 1, a test rod was produced by laminating carbon fiber prepreg and glass fiber prepreg. First, a carbon solid core material was used, which was formed from carbon fiber and had a tapered shape with a diameter that decreased toward the tip along the longitudinal direction. Then, a glass fiber prepreg manufactured by Toray Industries, Inc. was laminated on the carbon solid core material. The glass fiber prepreg was laminated so that the warp threads of the glass fibers were oriented in the axial direction of the carbon solid core material, and the weft threads were oriented in the circumferential direction of the carbon solid core material.

[0068] Next, carbon fiber prepreg and glass fiber prepreg were alternately wound around the tip of the test rod. The carbon fiber prepreg was manufactured by Toray Industries, Inc. The glass fiber prepreg was also manufactured by Toray Industries, Inc. The carbon fiber prepreg was laminated so that the warp of the carbon fiber was oriented in the axial direction of the carbon solid core material and the weft was oriented in the circumferential direction of the carbon solid core material, while the glass fiber prepreg was laminated so that the warp of the glass fiber was oriented in the axial direction of the carbon solid core material and the weft was oriented in the circumferential direction of the carbon solid core material. Finally, Toray carbon tape was wrapped around the surface at an angle (θ1: 45 degrees, θ2: 45 degrees).

[0069] Then, the carbon fiber prepreg, the glass fiber prepreg, and the carbon tape-wound carbon solid core material 1a were subjected to a heat treatment at a heating temperature of 130°C for a treatment time of 2 hours, and a test rod was produced. After the heat treatment, the test rod of Example 1 had a length of 700 mm, a diameter at the tip of 2 mm, and a diameter at the rear of 6 mm.

[0070] Furthermore, a test rod made of glass fiber was produced by a conventional method as Comparative Example 1. The diameter and length of the test rod of Comparative Example 1 were the same as those of the test rod of Example 1 after the heat treatment. Similarly, a conventional test rod made of carbon fiber was produced as Comparative Example 2. The diameter and length of the test rod of Comparative Example 2 were the same as those of the test rod of the Example after the heat treatment.

[0071] The rear ends of the test rods of Example 1 and Comparative Examples 1 and 2 were fixed, and a 375 g weight was hung from the tip. This state is shown in Figures 6, 7, and 8. Note that Figure 6 shows the test rod made of glass fiber of Comparative Example 1, Figure 7 shows the test rod of Example 1, and Figure 8 shows the test rod made of carbon fiber of Comparative Example 2.

[0072] As is clear from Figures 6 and 7, when a weight was hung, the test rod of Example 1 (Figure 7) was more taut (less likely to bend) than the test rod made of only glass fiber of Comparative Example 1 (Figure 6). As is clear from FIGS. 7 and 8, when a weight was hung, the test rod of Example 1 (FIG. 7) was more easily bent than the test rod of Comparative Example 2 made of only carbon fiber (FIG. 8). Furthermore, when the weights were measured, the test rod of the example weighed 15 g, the test rod of Comparative Example 1 made of only glass fiber weighed 16 g, and the test rod of Comparative Example 2 made of only carbon fiber weighed 14 g.

[0073] From these results, it can be seen that the test rod of Example 1 bends firmly when a load is applied, and is lighter in weight than the glass fiber rod. This difference becomes larger as the fishing rod becomes longer and thicker, which greatly changes its performance.

[0074] The weight of the weight hung from the tip of the test rod of Example 1 and the test rods of Comparative Examples 1 and 2 was increased, and the weight at which the rod broke was determined. As a result, the test rod of Example 1 broke at 6 kg, the test rod of Comparative Example 1 at 8 kg, and the test rod of Comparative Example 2 at 3 kg. This verified that the test rod of Example 1 was less likely to break.

[0075] Next, a torsion bending test was carried out. That is, the tip of each test rod of Example 1 and Comparative Examples 1 and 2 was twisted left and right, and the weight at which it broke was determined. As a result, the test rod of Example 1 broke at 5.5 kg, the test rod of Comparative Example 1 at 4 kg, and the test rod of Comparative Example 2 at 2 kg. This verified that the test rod of Example 1 was less likely to break. [Explanation of symbols]

[0076] 1 fishing rod 1a Carbon solid core material 2 carbon tape 3 First glass fiber layer 4 First carbon fiber layer 5 Second fiberglass layer 6 Second carbon fiber layer 7. Third fiberglass layer 10. Glass fiber prepreg 11 Glass fiber prepreg 12 Glass fiber prepreg 13 Glass fiber prepreg 14 Glass fiber prepreg 15 Carbon fiber prepreg 16 Glass fiber prepreg 17 Carbon fiber prepreg 18 Glass fiber prepreg

Claims

1. a tapered carbon solid core material formed from carbon fiber and having a diameter decreasing along the longitudinal direction; a first glass fiber layer formed on an outer peripheral surface of the carbon solid core material from the front end portion to the rear end portion; a first carbon fiber layer formed on an outer peripheral surface of the first glass fiber layer in at least a portion of the front end portion, the middle portion, and the rear end portion of the carbon solid core material; a second glass fiber layer formed on an outer peripheral surface of the first carbon fiber layer; A fishing rod comprising:

2. 2. The fishing rod according to claim 1, wherein the thickness of the first glass fiber layer increases from the tip end to the butt end of the carbon solid core.

3. a first carbon fiber layer formed on the outer peripheral surface of the first glass fiber layer; and a second glass fiber layer formed on the outer peripheral surface of the first carbon fiber layer, 2. The fishing rod according to claim 1, wherein the carbon solid core material is formed over the entire length from the tip to the rear end.

4. 4. A fishing rod according to claim 1 or claim 3, wherein the thickness of the second glass fiber layer is at least equal to or greater than the thickness of the first carbon fiber layer.

5. 2. The fishing rod according to claim 1, further comprising: a second carbon fiber layer formed on an outer peripheral surface of the second glass fiber layer; and a third glass fiber layer formed on an outer peripheral surface of the second carbon layer.

6. 6. The fishing rod according to claim 5, wherein the thickness of the first carbon fiber layer, the thickness of the second glass fiber layer, the thickness of the second carbon fiber layer, and the thickness of the third glass fiber layer are the same.

7. On the outermost glass fiber layer formed on the carbon solid core material, 3. A fishing rod according to claim 1 or claim 2, characterized in that the carbon tape is wound in one direction at an angle of 35 to 45 degrees relative to the axis of the carbon solid core material, and is wound in the opposite direction to the winding direction at an angle of 35 to 45 degrees relative to the axis of the carbon solid core material.

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