JPH05336864A - Fishing rod - Google Patents

Abstract

PURPOSE:To improve the flexural strength of the fishing rod comprising an intermediate layer, an inner layer and an outer layer and enhance the strength and rigidity of the fishing rod. CONSTITUTION:The fishing rod comprising an intermediate layer 1 formed from a prepreg in which carbon reinforcing fibers are arranged in the axial direction and inner and outer layers 2,3 which carbon reinforcing fibers are arranged in the circumferential direction, respectively, is characterized by enhancing the elastic modulus of the carbon reinforcing fibers in the inner layer 2 more than that in the outer layer 3 and also enhancing the strength of the carbon reinforcing fibers in the outer layer 3 more than that in the inner layer 2, thereby increasing the flexural strength of the fishing rod.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a fishing rod using carbon fiber as a reinforcing fiber of a prepreg.

[0002]

2. Description of the Related Art In a fishing rod using carbon fiber as a reinforcing fiber of a prepreg, a prepreg having a fiber direction in a circumferential direction is laminated on inner and outer layers of a prepreg having a fiber direction in an axial direction to improve bending strength and crush strength of the fishing rod. It is known from Japanese Utility Model Publication No. 2-16628 that improvement is intended.

[0003]

However, in the above-mentioned conventionally known ones, no particular consideration is given to the properties of the carbon reinforcing fibers in the circumferential direction in the prepreg of the inner and outer layers, and the same kind of carbon reinforcing fibers are used. It is the current situation. In view of these circumstances, the present inventor has conducted various experimental studies on the relationship between the carbon reinforcing fiber of the inner layer prepreg and the carbon reinforcing fiber of the outer layer prepreg, and a large difference in bending strength of the fishing rod due to the use of the carbon reinforcing fiber having different properties. It was confirmed that the bending strength of the fishing rod can be further improved as compared with the conventional one by finding out that there is one, and particularly by specifying the carbon reinforcing fibers of the inner and outer layers. An object of the present invention is to provide a fishing rod having a large bending strength based on this new finding.

In order to achieve the above object, the present invention comprises forming a prepreg in which carbon reinforcing fibers are impregnated with a thermosetting synthetic resin, and winding the prepreg to form inner and outer layers. Direction, the direction of the carbon reinforcing fibers of the prepreg forming the intermediate layer is a fishing rod arranged respectively in the axial direction, the elastic modulus of the carbon reinforcing fibers of the inner layer is greater than the elastic modulus of the carbon reinforcing fibers of the outer layer, the carbon of the outer layer The strength of the reinforcing fiber is higher than that of the carbon reinforcing fiber of the inner layer, and in particular, the pitch-based carbon fiber is used for the carbon reinforcing fiber of the inner layer, and the pan-based carbon fiber is used for the carbon reinforcing fiber of the outer layer. Is preferred.

[0005]

[Experimental example] A mandrel diameter of 20 was used for the carbon reinforcing fibers in the axial direction of the prepreg of the intermediate layer 1 and the carbon reinforcing fibers in the circumferential direction of the prepreg of the inner and outer layers 2.3, respectively.
mm, a 600 mm long tube formed by winding 1 ply of inner layer prepreg, 2 plies of intermediate layer prepreg, and 1 ply of outer layer prepreg to determine its bending strength by a 4-point bending test with a span length of 500 mm and a load distance of 150 mm. As shown in Table 2, the measurement result shows that the elastic modulus of the carbon reinforcing fiber of the inner layer 2 is larger than that of the carbon reinforcing fiber of the outer layer 3, and the strength of the carbon reinforcing fiber of the outer layer 3 is higher than that of the carbon reinforcing fiber of the inner layer 2. It was confirmed that the bending strength can be remarkably enhanced by forming it to be large.

[0006]

[Table 1]

[0007]

[Table 2]

The present invention is based on the new findings confirmed by the above experiment, and the inner and outer layers 2 and 2 of the intermediate layer 1 made of a prepreg obtained by impregnating the axial carbon reinforcing fibers with the thermosetting synthetic resin.
In Fig. 3, the bending strength of a fishing rod in which a prepreg in which circumferential carbon reinforcing fibers are impregnated with a thermosetting synthetic resin is arranged and formed is more efficiently improved as compared with a conventional one of this kind.

[0009]

INDUSTRIAL APPLICABILITY The present invention relates to a fishing rod comprising three layers in which carbon reinforcing fibers are arranged in the circumferential direction in the inner and outer layers of an intermediate layer in which carbon reinforcing fibers are axially arranged in a prepreg, and in particular, the elasticity of the carbon reinforcing fibers in the inner layer is improved. The bending strength of the outer layer carbon reinforcing fiber is made larger than that of the inner layer carbon reinforcing fiber, and the bending strength of the outer layer carbon reinforcing fiber is made larger than that of the inner layer carbon reinforcing fiber. It can be strengthened, and a high-strength fishing rod with high rigidity can be efficiently manufactured.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of the present invention.

[Explanation of symbols]

 1 Middle layer 2 Inner layer 3 Outer layer

Claims (2)

[Claims] 1. A prepreg in which a carbon reinforced fiber is impregnated with a thermosetting synthetic resin to form a prepreg, and the carbon reinforced fiber of the prepreg forming an inner layer and an outer layer is circumferentially oriented and an intermediate layer is formed. The direction of the carbon reinforcing fiber of, in the fishing rod respectively arranged in the axial direction, the elastic modulus of the carbon reinforcing fiber of the inner layer is larger than the elastic modulus of the carbon reinforcing fiber of the outer layer,
A fishing rod characterized in that the strength of the carbon reinforcing fiber of the outer layer is larger than that of the carbon reinforcing fiber of the inner layer. 2. The fishing rod according to claim 1, wherein a pitch-based carbon fiber is used as the carbon reinforcing fiber of the inner layer, and a pan-based carbon fiber is used as the carbon reinforcing fiber of the outer layer.