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

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[0001] The present invention relates to a fishing rod, and more particularly to a fishing rod that encloses a carbon solid core material and has a fiber reinforcement layer formed on the outer peripheral surface thereof.

Background Art

[0002] Fishing rods can be classified into glass rods (fishing rods made of glass fiber reinforced plastics) and carbon rods (fishing rods made of carbon fiber reinforced plastics) in terms of material, and into tubular rods with a circular hollow cross-sectional structure and solid rods with a circular solid cross-sectional structure in terms of shape. <00ness="bold">000011>[[ID=getElementById="15"> The glass rod and the carbon rod are selected according to the target fish for fishing or the preference of the user. Generally, the carbon rod is more widely used because it is stronger and lighter than the glass rod.

[0004] By the way, in the conventional carbon rod fishing rod, there was a risk of breakage due to the excessive rigidity (tensile strength) of the carbon rod. Therefore, as a means for preventing breakage of the fishing rod (carbon rod), Patent Document 1 proposes a fishing rod made of a carbon rod with excellent bending strength and impact resistance. Specifically, Patent Document 1 shows a fishing rod in which a large number of carbon layers with intersecting directions are laminated on a carbon solid core material made of a carbon fiber material, and the fishing rod has excellent bending strength and impact resistance compared to conventional fishing rods.

[0005] Specifically, as shown in Figure 9, the fishing rod 50 comprises a solid core material 51 formed from carbon fibers and having a tapered shape with a diameter that gradually decreases along its longitudinal direction; a forward-inclined carbon layer 52 in which carbon filaments are wound around the solid core material and laminated so as to be at an angle of 30° to 50° with respect to the longitudinal direction; and a reverse-inclined carbon layer 53 in which carbon filaments are wound around the forward-inclined carbon layer and laminated so as to be at an angle of 30° to 50° in the opposite direction to the longitudinal direction, symmetrically to the carbon filaments of the forward-inclined carbon layer; and further, a horizontal carbon layer 54 and a vertical carbon layer 55 are laminated on top of the reverse-inclined carbon layer 53.

[0006] In the fishing rod described in Patent Document 1, a suitable stiffness (resistance to bending) can be obtained by using a carbon solid formed from carbon fibers as the core material. Moreover, because the fishing rod described in Patent Document 1 has laminated carbon layers, its bending strength is improved compared to a fishing rod made of carbon rod of the same thickness. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2010-11848 [Overview of the project] [Problems that the invention aims to solve]

[0008] Incidentally, in fishing rods where a carbon fiber layer is laminated on the outer surface of a carbon solid core, if a large load is applied to the tip of the rod and the rod bends significantly, the carbon fibers in the carbon solid core may break and delaminate. Also, the fibers in the laminated carbon fiber layer may break, causing the carbon fiber layer to delaminate. In extreme cases, the fishing rod may deform, break, or otherwise be damaged. Furthermore, there is a growing demand from society for fishing rods that possess a moderate degree of stiffness (resistance to bending).

[0009] The inventors of this invention assumed that carbon solid core material would be used for fishing rods because it offers greater tensile strength (resistance to bending) compared to glass solid core material. Furthermore, we diligently investigated how to improve bending strength by laminating a carbon layer onto a carbon solid core, how to suppress the delamination of carbon fibers from the carbon solid core, and how to suppress the delamination of the laminated carbon fiber layer. We discovered that the peeling of carbon fibers from the carbon solid core material can be suppressed by forming a glass fiber layer on the carbon solid core material, and that the peeling of laminated carbon fiber layers can be suppressed by forming a glass fiber layer between the carbon fiber layers and by forming a glass fiber layer on the outermost carbon fiber layer, thus completing the present invention. Furthermore, we discovered that by laminating a carbon fiber layer and a glass fiber layer on top of a glass fiber layer, we could improve bending strength and obtain a fishing rod with appropriate resistance to bending, thus completing the present invention.

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

[0011] To solve the aforementioned problems, the fishing rod according to the present invention is characterized by comprising: a carbon solid core material formed from carbon fibers and having a tapered shape with a diameter decreasing along the longitudinal direction; a first glass fiber layer formed on the outer circumferential 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 circumferential 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 circumferential surface of the first carbon fiber layer.

[0012] Thus, by using a carbon solid core material that is formed from carbon fibers and has a tapered shape with a diameter decreasing along the longitudinal direction, it is possible to obtain appropriate stiffness (resistance to bending). Furthermore, the first glass fiber layer is formed on the outer surface of the carbon solid core material, from the tip to the rear end. This further suppresses the peeling of carbon fibers from the carbon solid core material, thereby further suppressing damage such as deformation and breakage of the fishing rod.

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

[0014] Here, it is desirable that the first glass fiber layer becomes thicker from the leading edge to the trailing edge of the carbon solid core material. In other words, when a load is applied to 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 is applied, has a thicker first glass fiber layer. This further suppresses the peeling of carbon fibers from the carbon solid core material, thereby further suppressing damage such as deformation and breakage of the fishing rod.

[0015] Furthermore, it is desirable that the first carbon fiber layer formed on the outer circumferential surface of the first glass fiber layer and the second glass fiber layer formed on the outer circumferential surface of the first carbon fiber layer are formed over the entire length of the carbon solid core material, from the front to the rear end. This increases the overall bending strength of the fishing rod, further suppresses delamination of carbon fibers, and reduces damage such as deformation and breakage of the fishing rod.

[0016] Furthermore, it is desirable that the thickness of the second glass fiber layer be 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 suppress the peeling of the carbon fibers in the first carbon fiber layer, and therefore cannot suppress damage such as deformation or breakage of the fishing rod, which is undesirable.

[0017] Furthermore, it is desirable to include a second carbon fiber layer formed on the outer circumferential surface of the second glass fiber layer and a third glass fiber layer formed on the outer circumferential surface of the second carbon layer. The bending strength of the areas where the second carbon fiber layer and the third glass fiber layer are formed can be increased, the delamination of the carbon fibers can be further suppressed, and damage such as deformation and breakage of the fishing rod can be further suppressed.

[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 all the same. By having the same thickness for the first carbon fiber layer, the second glass fiber layer, the second carbon fiber layer, and the third glass fiber layer, the peeling of carbon fibers in the first and third carbon fiber layers can be suppressed, thereby further suppressing damage such as deformation and breakage of the fishing rod. Furthermore, the second carbon fiber layer and the third glass fiber layer may be repeatedly laminated.

[0019] Further, on the outermost glass fiber layer formed on the carbon solid core material, the carbon tape is wound in one direction at an angle of 35 degrees to 45 degrees with respect to the axis of the carbon solid core material, and in the direction opposite to the winding direction, it is wound at an angle of 35 degrees to 45 degrees with respect to the axis of the carbon solid core material, which is desirable. When the carbon tape is wound in this way, in order to counteract the twisting (the force that rotates around the axis of the fishing rod) that the carbon tape acts on the fishing rod, a fishing rod that is resistant to twisting can be obtained.

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, a fishing rod that is difficult to bend can be obtained, and further, peeling of the carbon fibers of the carbon solid core material and peeling of the laminated carbon fiber layer can be suppressed, and breakage such as deformation and breakage can be suppressed.

Brief Description of the Drawings

[0021] [Figure 1] Figure 1 is a diagram showing a fishing rod according to an embodiment of the present invention. [Figure 2] Figure 2 is a cross-sectional view shown in Figure 1, (a) is a cross-sectional view of the I-I section at the tip of the fishing rod, (b) is a cross-sectional view of the II-II section at the middle of the fishing rod, and (c) is a cross-sectional view of the III-III section at the rear end of the fishing rod. [Figure 3] Figure 3 is a diagram showing the wound state of the carbon tape. [Figure 4] Figure 4 is a diagram for explaining the twisting acting on the fishing rod. [Figure 5] Figure 5 is a diagram showing a manufacturing method of the fishing rod according to the present invention. [Figure 6] Figure 6 is a diagram showing the state of bending of Comparative Example 1. [Figure 7] Figure 7 is a diagram showing the state of bending of the Example. [Figure 8] Figure 8 is a diagram showing the state of bending of Comparative Example 2. [Figure 9] Figure 9 shows the configuration of a conventional fishing rod. [Modes for carrying out the invention]

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

[0023] As shown in Figures 1 and 2, a carbon solid core material 1a is provided in the center of the 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 fibers and is formed in a tapered shape in which the diameter gradually decreases along the longitudinal direction from the rear end to the tip.

[0024] Furthermore, a first glass fiber layer 3 is formed on the outer surface of the carbon solid core material 1a, from the tip to the rear end. The thickness of the first glass fiber layer 3 increases from the leading edge L1 to the trailing edge L3 of the carbon solid core material 1a, with the trailing edge of the carbon solid core material 1a being the thickest.

[0025] This first glass fiber layer 3 is formed by laminating multiple glass fiber prepregs. These glass fiber prepregs are composite materials made by impregnating glass fibers in sheet form with resin, and are molding raw materials for fiber-reinforced plastics; known types 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 leading edge to the trailing edge of the carbon solid core material 1a. For example, as shown in Figure 2(a), the first glass fiber layer 3 of the tip portion L1 of the carbon solid core material 1a is formed from a single glass fiber prepreg. Furthermore, as shown in Figure 2(b), the first glass fiber layer 3 in the intermediate portion L2 of the carbon solid core material 1a is formed from three glass fiber prepregs. Furthermore, as shown in Figure 2(c), the first glass fiber layer 3 of the rear end portion L3 of the carbon solid core material 1a is formed from five glass fiber prepregs.

[0027] Furthermore, if the glass fiber prepreg is made of glass fibers impregnated with a thermoplastic resin, it softens when heated and hardens when cooled, forming the first glass fiber layer 3. Alternatively, if the glass fiber prepreg is made of glass fibers impregnated with a thermosetting resin, it hardens when heated, forming the first glass fiber layer 3. Furthermore, any type of glass fiber prepreg can be used in the fishing rod according to the present invention.

[0028] Thus, since the first glass fiber layer 3 is formed on the outer surface of the carbon solid core material 1a from the tip to the rear end, the 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 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. This carbon fiber prepreg is a composite material made by impregnating carbon fibers in sheet form with resin, and is a molding material for fiber-reinforced plastics; known types can be used.

[0030] For example, if the carbon fiber prepreg is made of carbon fibers impregnated with a thermoplastic resin, it softens when heated and hardens when cooled, forming the first carbon fiber layer 4. Alternatively, if the carbon fiber prepreg is made of carbon fibers impregnated with a thermosetting resin, it hardens when heated, forming the first carbon fiber layer 4.

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

[0032] Furthermore, a second carbon fiber layer 6 is formed on the outer 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 used to form the first carbon fiber layer 4.

[0033] Furthermore, a third glass fiber layer 7 is formed on the outer surface of the second carbon fiber layer 6. This third glass fiber layer 7 is formed from a single glass fiber prepreg. This glass fiber prepreg is the same as the one used to form the first glass fiber layer 3.

[0034] As described above, each carbon fiber layer and each glass fiber layer are formed by winding carbon fiber prepreg and glass fiber prepreg around a carbon solid core material 1a, and then applying heat. Furthermore, by applying heat, the carbon fiber layer and the glass fiber layer adhere to each other, and the carbon solid core material 1a, the carbon fiber layer, and the glass fiber layer become integrated into a single unit.

[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, thereby suppressing the peeling of the first carbon fiber layer 4. Furthermore, by forming the third glass fiber layer 7 on the outer 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, thereby suppressing the peeling of the second carbon fiber layer 6 and preventing deformation, breakage, etc., of the fishing rod. In particular, deformation, breakage, etc., of the rear end of the fishing rod can be suppressed.

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

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

[0038] As described above, the carbon tape 2 is wound in both forward and reverse directions at an angle of 35 to 45 degrees with respect to the axis of the carbon solid core material 1a. Therefore, as shown in Figure 4, when torsional forces acting on the fishing rod 1 in both forward and reverse directions (forces that rotate the fishing rod in the X and Y directions with the axis of the fishing rod as the center O) occur, the carbon tape 2 can resist these forces, resulting in a fishing rod that is resistant to torsion.

[0039] Here, if the carbon tape 2 is at an angle of less than 35 degrees with respect to the axis of the carbon solid core material 1a, the number of turns of the carbon tape 2 increases, making the fishing rod heavier, which is undesirable. On the other hand, if the angle with respect to the axis of the carbon solid core material 1a exceeds 45 degrees, the force resisting the rotational force in the X and Y directions around the axis 1a of the fishing rod 1 is weak, resulting in a fishing rod that is weak against twisting, which is undesirable.

[0040] The fishing rod according to the present invention, having the above-described configuration, uses a carbon solid core material 1a that is formed from carbon fibers and has a tapered shape in which the diameter decreases along the longitudinal direction, thereby providing appropriate stiffness (resistance to bending). Furthermore, since the first glass fiber layer 3 is formed on the carbon solid core material 1a, the peeling of 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. In particular, since the first glass fiber layer 3 is thickly formed 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 is applied, the peeling of 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, because a first carbon fiber layer 4 is formed on the outer circumferential surface of the first glass fiber layer 3, and a second glass fiber layer 5 is formed on the outer circumferential surface of the first carbon fiber layer 4, the mechanical strength of the rear end of the fishing rod can be increased. Furthermore, because the first carbon fiber layer 4 is sandwiched between the first glass fiber layer 3 and the second glass fiber layer 5, the peeling of the laminated first carbon fiber layer 4 can be suppressed, preventing deformation, breakage, etc., of the rear end of the fishing rod.

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

[0043] In the above embodiment, the case in which 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) was described. However, the present invention is not limited to cases where 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), but may be formed throughout the entire carbon solid core material (fishing rod). Furthermore, the present invention may be formed on any part of the tip portion L1, the intermediate portion L2, or the rear end portion L3, or it may be formed on a part of the tip portion L1, a part of the intermediate 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 subjected to strong bending, 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 on the rear end portion L3. Furthermore, if you want to increase the stiffness 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, respectively.

[0045] Next, the method for manufacturing a fishing rod according to the present invention will be explained with reference to Figure 5. In Figure 5, S1 to S13 indicate the order of the steps. First, a carbon solid core material 1a is prepared as shown in Figure 5 (S1). This carbon solid core material 1a is formed from carbon fibers and has a tapered shape along its longitudinal direction, with the diameter decreasing towards the tip. This carbon solid core material 1a can be manufactured by a generally known manufacturing method.

[0046] Next, glass fiber prepreg is wound around the manufactured carbon solid core material 1a (S2-S6). The glass fiber prepreg is a sheet-like material in which reinforcing glass fibers cut into a predetermined shape are impregnated with synthetic resin, and known types can be used.

[0047] First, in the glass fiber prepreg 10 wound around the carbon solid core material 1a, the leading edge of the rectangular prepreg is cut diagonally to form a tapered portion 10a. Specifically, the tip edge 10b of the glass fiber prepreg 10 is cut diagonally from approximately 1 / 3 of the way from the side edge 10d towards a specific point 10e on the side edge 10d that exceeds the tip portion L1, thereby forming a tapered portion 10a.

[0048] As a result, when winding the glass fiber prepreg 10 from one side 10c to the other side 10d around the carbon solid core material 1a, the winding layer of the glass fiber prepreg 10 on the tip side of the carbon solid core material is thin due to the tapered portion 10a (the narrower portion), and the winding layer gradually becomes thicker. Then, winding layers of glass fiber prepreg 10 are formed on the carbon solid core material with a certain thickness in the intermediate L2 region and the rear end L3 region.

[0049] Furthermore, the distance from the tip L1 to a specific point 10e affects the rigidity of the rod. In other words, if the distance from the tip L1 to a specific point 10e increases, the portion of the glass fiber prepreg that is wound around the glass fiber prepreg 10 and beyond, which will be described later, becomes shorter, and the rigidity of the rod decreases. Conversely, if the distance from the tip L1 to a specific point 10e decreases, the portion of the glass fiber prepreg that is wound around the glass fiber prepreg 10 and beyond, which will be described later, becomes longer, and the rigidity of the rod increases. Therefore, considering the rigidity of the fishing rod, it is necessary to determine the position of specific point 10e.

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

[0051] Unlike the glass fiber prepreg 10, this glass fiber prepreg 11 has no edges at the tip, but rather corners 11b, and the tip portion of the rectangular prepreg is cut diagonally to form a tapered portion 11a. The distance to the specific point 11e that forms the tapered section 11a, like the specific point 10e, affects the rigidity of the rod. Therefore, the position of the specific point 11e must be determined considering the rigidity of the fishing rod.

[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 to the other side 11d. As a result, the winding layer of the glass fiber prepreg 11 at the tip of the carbon solid core material 1a is thin in the portion where the tapered section 11a is formed (the narrower portion), and the winding layer gradually becomes thicker. Then, the winding layer of the glass fiber prepreg 11 at a constant thickness is formed on part of the middle section and the rear end section of the carbon solid core material 1a.

[0053] Furthermore, a glass fiber prepreg 12 is prepared in which the tapered portion 12a starts from a position corresponding to the end of the tapered portion 11a (specific point 11e) of the glass fiber prepreg 11 (S4). Then, the tip (corner portion 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 winding layer of the glass fiber prepreg 12 is thin in the portion where the tapered section 12a is formed (the narrower portion), and gradually thickens. Then, the winding layer of the glass fiber prepreg 12 is formed on the carbon solid core material 1a with a constant thickness in part of the middle section and the rear end section.

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

[0055] Thus, when glass fiber prepregs 10-14 are wound around a carbon solid core material 1a, the tip portion L1 of the carbon solid core material 1a is not wound with glass fiber prepregs 11-14 (only glass fiber prepreg 10 is wound around it), resulting in a thin layer of glass fiber prepregs. On the other hand, in the middle section L2 of the carbon solid core material 1a, glass fiber prepregs 10, 11, and 12 are wound around it, so the winding layer of glass fiber prepregs is thicker than at the tip. Furthermore, since glass fiber prepregs 13 and 14 are wound around the rear end portion L3 of the carbon solid core material 1a, the winding layer of glass fiber prepregs is thicker than that of the intermediate portion L2.

[0056] Thus, the winding layer of glass fiber prepregs 10-14 becomes thicker from the tip of the carbon solid core material 1a to the trailing end of the carbon solid core material 1a. In other words, the thickness of the first glass fiber layer 3 formed by the glass fiber prepregs 10-14 increases from the leading edge to the trailing edge of the carbon solid core material 1a, with the trailing edge portion L3 of the carbon solid core material 1a being the thickest.

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

[0058] Furthermore, a glass fiber prepreg 16 is wound around the outer surface of the carbon fiber prepreg 15 (S8). Specifically, a tapered portion 16a is formed at the tip 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, carbon fiber prepreg 17 is wound around the rear end portion L3 of the carbon solid core material 1a on the outer surface of the glass fiber prepreg 16 (S9). Specifically, a tapered portion 17a is formed at the tip of the carbon fiber prepreg 17, and the tip 17b of the carbon fiber prepreg 17 is aligned with a specific point 16e of the glass fiber prepreg 16, and the carbon fiber prepreg 17 is wound so that the rear end 17b of the carbon fiber prepreg 17 is located at the rear end 16b of the glass fiber prepreg 16.

[0060] Furthermore, a glass fiber prepreg 18 is wound around the rear end portion L3 of the carbon solid core material 1a on the outer surface of the carbon prepreg 17 (S10). Specifically, a tapered portion 18a is formed at the tip of the glass fiber prepreg 18, and the tip 18b of the carbon fiber prepreg 18 is aligned with a specific point 17e of the glass fiber prepreg 17, and the carbon fiber prepreg 18 is wound so that 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 manner, carbon fiber prepregs 15 and 17 and glass fiber prepregs 16 and 18 are wound alternately around the rear end portion L3 of the carbon solid core material 1a. That is, at the rear end portion of the carbon solid core material 1a, glass fiber layers 5 and 7 are formed so as to sandwich the carbon fiber layers 4 and 6.

[0062] In a carbon solid core material constructed in this manner, in which carbon fiber prepreg and glass fiber prepreg are wound, the entire outer surface is formed to be covered by the glass fiber prepreg.

[0063] Next, the carbon tape 2 is wound in one direction on the glass fiber layer on the entire outer surface of the wound material at an angle of 35 to 45 degrees with respect to the axis of the carbon solid core material 1a. Furthermore, 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 glass fiber prepregs 16, 18 that protrude from the rear end of the carbon solid core material 1a are cut, and the rear end of the carbon solid core material 1a is also cut and processed to a predetermined size (S12).

[0065] Subsequently, the carbon solid core material 1a, which is wound with carbon fiber prepreg, glass fiber prepreg, and carbon tape, is subjected to heat treatment (S13). The heat treatment varies depending on the synthetic resin that makes up 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, during the initial heating step, the synthetic resin impregnated in the carbon fiber prepreg or glass fiber prepreg softens, and air trapped during winding and gases generated by heating are released to the outside. At this time, the carbon fiber prepreg, glass fiber prepreg, and carbon tape become integrated, and the carbon fiber layer, glass fiber layer, and carbon tape become integrated. Then, if the heating process is continued, the synthetic resin impregnated in the prepreg hardens, the shape is fixed, and the rod is completed. [Examples]

[0067] As Example 1, a test rod was fabricated by laminating carbon fiber prepreg and glass fiber prepreg. First, a carbon solid core material was used, which was formed from carbon fibers and had a tapered shape in which the diameter decreased towards the tip along the longitudinal direction. Then, a glass fiber prepreg was laminated onto the carbon solid core material. The glass fiber prepreg used was manufactured by Toray Industries, Inc. Furthermore, 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 wrapped around the tip of the test rod. The carbon fiber prepreg used was manufactured by Toray Industries, Inc. Similarly, the glass fiber prepreg used was also manufactured by Toray Industries, Inc. Furthermore, the carbon fiber prepreg was laminated so that the warp threads of the carbon 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. Similarly, 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. Finally, Toray's carbon tape was wrapped around it at an angle (θ1:45 degrees, θ2:45 degrees).

[0069] Next, a carbon solid core material 1a, which was wound with carbon fiber prepreg, glass fiber prepreg, and carbon tape, was heat-treated. The heating temperature was 130°C and the treatment time was 2 hours, and a test rod was fabricated. After heat treatment, the length of the test rod in Example 1 was 700 mm, the diameter of the tip was 2 mm, and the diameter of the rear end was 6 mm.

[0070] Furthermore, as Comparative Example 1, a test rod made of glass fiber was manufactured using a general method. The diameter and length of this Comparative Example 1 test rod were the same as those of the test rod of Example 1 after heat treatment. Similarly, as Comparative Example 2, a test rod made of carbon fiber was conventionally manufactured. The diameter and length of this Comparative Example 2 test rod were the same as those of the test rod in the example after heat treatment.

[0071] Then, the rear ends of the test rods of Example 1 and Comparative Examples 1 and 2 were fixed, and a 375g weight was suspended from the tip. This state is shown in Figures 6, 7, and 8. 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 is suspended from it, the test rod of Example 1 (Figure 7) is stiffer (less prone to bending) than the test rod of Comparative Example 1 made only of glass fiber (Figure 6). As is clear from Figures 7 and 8, when a weight is suspended from it, the test rod of Example 1 (Figure 7) bends more easily than the test rod of Comparative Example 2 made only of carbon fiber (Figure 8). Furthermore, when the weights were measured, the test rod of the example weighed 15g, the test rod of comparative example 1 made only of glass fiber weighed 16g, and the test rod of comparative example 2 made only of carbon fiber weighed 14g.

[0073] From these observations, it can be seen that the test rod of Example 1 bends well when a load is applied, and is lighter in weight than the fiberglass rod. This difference becomes larger as the fishing rod becomes longer and thicker, and therefore its performance changes significantly.

[0074] The weight of the weight suspended from the tip of the test rod in Example 1 and the test rods in 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 broke at 8 kg, and the test rod of Comparative Example 2 broke at 3 kg. This confirmed that the test rod of Example 1 was less prone to breakage.

[0075] Next, a torsional bending test was performed. Specifically, the tip of the test rods in Example 1 and Comparative Examples 1 and 2 was twisted from side to side, and the weight at which they broke was determined. As a result, the test rod of Example 1 broke at 5.5 kg, the test rod of Comparative Example 1 broke at 4 kg, and the test rod of Comparative Example 2 broke at 2 kg. This confirmed that the test rod of Example 1 was less prone to breakage. [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 glass fiber layer 6. Second carbon fiber layer 7. Third glass fiber 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 carbon solid core material formed from carbon fibers, with a tapered shape in which the diameter decreases along the longitudinal direction, A first glass fiber layer is formed on the outer surface of the carbon solid core material, from the tip to the rear end, A first carbon fiber layer is formed on the outer surface of at least a portion of the first glass fiber layer of the tip, middle, and rear end portions of the carbon solid core material, A second glass fiber layer formed on the outer surface of the first carbon fiber layer, A fishing rod characterized by including [a specific feature].

2. The fishing rod according to claim 1, characterized in that the first glass fiber layer becomes thicker from the tip to the rear end of the carbon solid core material.

3. A first carbon fiber layer formed on the outer surface of the first glass fiber layer and a second glass fiber layer formed on the outer surface of the first carbon fiber layer are The fishing rod according to claim 1, characterized in that it is formed on the entire portion from the tip to the rear end of the carbon solid core material.

4. The fishing rod according to claim 1 or 3, characterized in 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.

5. The fishing rod according to claim 1, characterized by comprising a second carbon fiber layer formed on the outer surface of the second glass fiber layer and a third glass fiber layer formed on the outer surface of the second carbon fiber layer.

6. The fishing rod according to claim 5, characterized in 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.

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

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