JP2575095B2 - Fishing rod - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fishing rod made of fiber reinforced prepreg.

[0002]

2. Description of the Related Art In a fishing rod composed of a fiber-reinforced prepreg impregnated with a synthetic resin, a fiber direction of an intermediate layer is formed in an axial direction, and a fiber direction of an inner layer and an outer layer are formed in a circumferential direction. The reinforcing fiber has a tensile elasticity of 24 × 1
0 ³ kg / mm ^2, to form a carbon fiber having a fiber diameter 7μ are known in JP-A-63 over 39,327.

[0003]

However, in the conventional method, carbon fibers having a low elastic modulus and a large fiber diameter are used for the circumferential reinforcing fibers in the inner and outer layers.
When a load is applied to a fishing rod, the cross section of the rod pipe (circumferential
Surface) , the stress is concentrated on the portion of the inner and outer layers where the amount of crushing deformation is large before the carbon fiber of the intermediate layer exerts sufficient tensile strength, so that it is easily broken.
Because the fiber diameter is large , it is straight when bent in the circumferential direction.
There is a problem that the force to return is large, and the adhesion force between the fibers at the boundary surface between the reinforcing fiber in the axial direction and the reinforcing fiber in the circumferential direction of the intermediate layer is relatively weak , causing interface separation and the like. .

[0004] Conventionally, it is considered that carbon fibers in the circumferential direction cannot be made highly elastic. If the tensile elastic modulus is high, the fibers are difficult to bend and the winding operation of the prepreg, which forms the inner and outer layers, becomes troublesome, and the strength of the product is reduced. Variation becomes large and mass production becomes difficult. In particular, when the fiber amount is large, it becomes more difficult to wind.

[0005] Further, when the tensile modulus is increased, the fiber elongation is decreased, so that it is difficult to follow the cross-sectional deformation of the rod tube, and it is easy to peel off at the interface. Because it increases the cost without contributing,
Conventionally, there is no point in using it.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a high-strength and lightweight fishing rod by improving the above-mentioned defect when using a carbon fiber having a large tensile modulus in the circumferential direction. .

[0007]

In order to achieve the above object, the present invention comprises a fiber reinforced prepreg impregnated with a thermosetting synthetic resin, and the inner layer and the outer layer are arranged so that the reinforcing fibers are aligned in the circumferential direction. In the fishing rod in which the intermediate layer is formed mainly in the axial direction mainly in the direction in which the reinforcing fibers are aligned, the circumferential reinforcing fibers have a tensile modulus of elasticity greater than 35 × 10 ³ kg / mm ² and an average fiber diameter of It is formed of carbon fibers of less than 6 microns.

[0008] Fibers other than carbon fibers can be used as the reinforcing fibers in the intermediate layer in the axial direction, and other reinforcing fibers can be used in combination with a part thereof. The circumferential carbon fibers, which are the reinforcing fibers of the inner and outer layers, have a tensile modulus of elasticity of 35 × 1.
0 ³ to 80 × 10 ³ kg / mm ² , preferably 40 × 10 ³ kg / mm ²
６５65 × 10 ³ kg / mm ² , and the average fiber diameter is preferably 5.5 to 3.0 μm.

[0009]

[Function] Even if the tensile modulus is increased, the average fiber diameter is reduced.
Carbon fiber, which is the reinforcing fiber of the prepreg for the inner and outer layers
The fiber is easy to bend and the winding work is easy, forming an intermediate layer
The adhesion of the prepreg to the reinforcing fibers in the axial direction is also improved,
Interfacial delamination between inner and outer layers and intermediate layer in molded rod pipe
To prevent separation, and to pull the circumferential carbon fibers in the inner and outer layers.
Crossing by force acting on the fishing rod rod tube due to its large elastic modulus
Crushing deformation of the surface can be prevented. In addition, the supplement in the present invention
The circumferential and axial directions of the strong fiber are generally oriented in that direction
That means, not strictly.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
The rod tube 1 includes an intermediate layer 2 formed by winding a prepreg in which a thermosetting synthetic resin is impregnated with axial carbon fibers and other aligned reinforcing fibers, and a circumferential direction integrally provided inside and outside thereof. The inner layer 3 and the outer layer 4 are formed by winding a prepreg impregnated with a thermosetting synthetic resin on the carbon fiber aligned sheet.

The circumferential carbon fibers which are the reinforcing fibers of the inner layer 3 and the outer layer 4 have a tensile modulus of 35 × 10 ³ k.
g / mm ² , preferably 40 × 10 ^{3 to} 65 × 1
0 ³ kg / mm ² with an average fiber diameter of less than 6 microns,
Preferably 50~5g / m ² preferably per unit area as the 5.5 to 3.0 micron 35~10g / m ² to be used.

The bending strength comparison test between the fishing rod according to the present invention and the conventional fishing rod is shown in the following table.

[0013]

[Table 1] Bending strength test table

Note 1 The reinforcing fiber of the intermediate layer prepreg is carbon fiber, and its tensile modulus is 60 × 10 ³ kg / mm ² , average fiber diameter is 5 μm, fiber usage is 150 g / m ² , and prepreg thickness is 0.14 mm And the number of winding plies was 2. Note 2 Flexural strength is a 4-point bending test, sample length 600m
m, the receiving side span is 500 mm, the pushing side span is 150 mm, and the pressure head descending speed is 25 mm / min.

[0015]

According to the present invention, the tensile elastic modulus of the circumferentially aligned carbon fiber, which is the reinforcing fiber of the prepreg forming the inner and outer layers of the fishing rod, is set to be greater than 35 × 10 ³ kg / mm ^{2 so} that the stress is applied to the rod pipe. Even if it acts, the rod tube section (circumferential direction) is prevented from being deformed, and the average fiber diameter is formed to be less than 6 microns, so that the boundary surface of the intermediate layer with the reinforcing fiber in the axial direction of the intermediate layer becomes familiar. It can be easily and firmly adhered to prevent interfacial peeling. Therefore, the rod tube cross section is hardly deformed, and damage such as interface delamination between layers due to the deformation is reliably prevented, and a high-strength, rigid, and lightweight fishing rod can be obtained.

Further, since the average diameter of the aligned carbon fibers in the circumferential direction is small, even if the tensile modulus of elasticity is increased, the carbon fibers can be easily wound around the core metal and the prepreg winding operation is easy. Since it can be increased, the strength can be stabilized and the weight can be reduced, which is suitable for a thin fishing rod such as an ayu rod.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of a fishing rod of the present invention .

FIG. 2 is a cross-sectional view of the fishing rod of FIG.

[Explanation of symbols]

 1 rod pipe 2 middle layer 3 inner layer

Claims (1)

(57) [Claims] 1. A fiber reinforced prepreg impregnated with a thermosetting synthetic resin, wherein an inner layer and an outer layer are arranged in a circumferential direction in a direction in which reinforcing fibers are arranged, and an intermediate layer is formed in an axial direction mainly in a direction in which reinforcing fibers are arranged. In each of the formed fishing rods, the circumferential reinforcing fibers are formed of carbon fibers having a tensile modulus of elasticity greater than 35 × 10 ³ kg / mm ² and an average fiber diameter of less than 6 microns. .