JP3219242B2 - Tubular body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tubular body formed of a prepreg in which a reinforcing fiber is impregnated with a synthetic resin. About.

[0002]

2. Description of the Related Art A so-called prepreg is used for forming the above-mentioned tubular body because it is strong and lightweight. Since the prepreg is usually thin, it is wound around the core several times to obtain a desired tubular body thickness.

[0003]

However, as will be described in detail later, in a tubular body in which the number of continuous windings of the main prepreg exceeds 3, the number of continuous windings of the prepreg is divided into two or less. It was found that the strength was lower than that of the tubular body. This tendency is particularly strong when the tubular body has a large taper, and it is considered that bubbles and the like remain at the time of winding and heat forming.

Accordingly, an object of the present invention is to provide a tubular body having improved strength.

[0005]

SUMMARY OF THE INVENTION In view of the above objects, the present invention provides a carbon fiber-based reinforcing fiber having a resin impregnation ratio of 20 %.
A first prepreg having a weight percent of 10 wt% or more is disposed so that a fiber direction thereof is substantially oriented in a longitudinal direction of the tubular body, and carbon fiber is mainly used as a reinforcing fiber, and a resin impregnation rate is higher than that of the first prepreg. Is large and 50 wt% or less, a second prepreg is disposed so that its fiber direction is substantially directed in the circumferential direction of the tubular body, and the rod pipe formed by winding the first prepreg three or more times is formed as a whole. A tubular body characterized by having an average resin impregnation rate of 30 wt% or less and being divided so that the number of continuous windings of the first prepreg is at most two. The number of turns referred to in the present application is not necessarily exactly an integer. For example, in the case of two turns, 2.1 turns
Including winding to overlap somewhat like times,
This means roughly twice.

[0006] The resin impregnation rate of 20 wt% or less and 50
Since the average of the prepregs of not more than 30% by weight is 30% by weight or less, the prepreg of 20% by weight or less is a thick main prepreg. In such a prepreg having a smaller resin impregnation rate as compared with the related art, bubbles tend to remain at the time of forming the tubular body, and the strength tends to decrease. Therefore, although the details are unknown, the generation of such bubbles and the like can be reduced by setting the continuous winding length of the main first prepreg to less than or equal to two times, thereby improving the strength of the tubular body.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to embodiments shown in the accompanying drawings. FIG. 1 is a view showing a forming method of an embodiment of a fishing rod rod tube as a tubular body according to the present invention. The core metal 10 has a diameter D at the center position of 1
0 mm, and the taper ratio is 1/1000. A prepreg sheet C1 impregnated with an epoxy resin, and a carbon fiber as a reinforcing fiber are disposed so as to be oriented in the longitudinal direction of the cored bar 10, and are arranged so that the carbon fiber is oriented in a circumferential direction.
The length B in the winding direction of the laminated sheet in which the prepreg sheet C2 as the backing impregnated with the epoxy resin is set so that the number of windings is one, and this is wound first.

Further, the prepreg sheet C1 'impregnated with epoxy resin is disposed so that the carbon fibers are directed in the longitudinal direction of the cored bar 10, and the carbon fibers are disposed so as to be directed in the circumferential direction. A prepreg sheet C2 'as a backing impregnated with epoxy resin is overlapped, and the length B' in the winding direction is set so that the number of turns is two times. To wind. Thus, a rod tube body wound three times is formed, on which a tightening tape is wound and heat-molded. In this case, the tension of the fastening tape is 4
Set to about kg. In the present application, the tape tension is preferably 4 kg or more.

The thickness of the prepreg sheets C1 and C1 ′ is 0.072 mm, the amount of carbon fibers is 105 g / m ² ,
Resin impregnation rate is 15wt%, prepreg sheets C2, C
The thickness of 2 ′ is 0.025 mm and the carbon fiber content is 23
g / m ² , and the resin impregnation rate is 40 wt%.

On the other hand, as a conventional rod tube, a superposed sheet having a length B + B 'in the winding direction in which two superposed sheets shown in FIG. A rod tube formed by tightening with the same tightening force was prepared. The strength of the two rod tubes was compared by a four-point bending test. As a result, the bending strength of the conventional rod pipe is 115.56 kg.
/ Mm ² , and the rod pipe of the present invention is 121.40 kg / mm.
^{Was 2} . That is, the strength of the rod tube according to the present invention was improved by about 5%.

In the above description, an example in which the number of turns is three has been described.
The same applies to four times or more. In fact, the bending strength of the rod tube that was continuously wound four times in the four-point bending test was 144.16 kg / mm ^2.
However, the bending strength of the present invention obtained by dividing and winding this into two turns is 151.90 kg / mm ^2, which is an improvement of more than 5%. In the case of four times, it is divided into two times, and once, twice, and once, and may be divided and wound. In the case of the above three times, it is wound first twice, and thereafter. It may be wound once, or may be separated into once, once and once. Furthermore, a prepreg impregnated with a resin other than the epoxy resin using a reinforcing fiber other than the carbon fiber has the same effect. The present invention is particularly effective when the inner diameter of the rod tube (outer diameter of the core metal) is about 15 mm or less, preferably about 10 mm or less.

[0012]

As is clear from the above description, according to the present invention, the strength of the tubular body is improved by setting the continuous length of the main fiber when the prepreg is wound in the longitudinal direction to less than twice. I do.

[Brief description of the drawings]

FIG. 1 is an explanatory view of the production of a tubular body according to the present invention.

[Explanation of symbols]

C1, C1 'Prepreg with carbon fibers oriented in the longitudinal direction C2, C2' Prepreg with carbon fibers oriented in the circumferential direction

──────────────────────────────────────────────────続 き Continued on front page (51) Int.Cl. ⁷ Identification code FI B32B 1/08 B32B 5/12 5/00 B29K 105: 08 5/12 B29L 23:00 // B29K 105: 08 B29C 67/14 B B29L 23:00 A01K 87/00 630A B29C 67/14 C (58) Fields studied (Int. Cl. ⁷ , DB name) B29C 70/00-70/88 A01K 87/00-87/08 A63B 49 / 00-49/18 A63B 53/00-53/16 A63C 11/00-11/26 B32B 1/00-1/10 B32B 5/00-5/32

Claims (1)

(57) [Claims] 1. A first prepreg having carbon fiber as a main reinforcing fiber and a resin impregnation ratio of 20 wt% or less and 10 wt% or more, is disposed so that its fiber direction is substantially directed to the longitudinal direction of the tubular body, Carbon fiber as the main reinforcing fiber, the resin impregnation rate is higher than that of the first prepreg, and is 50 wt%.
The following second prepreg is disposed so that the fiber direction thereof is oriented substantially in the circumferential direction of the tubular body, and the average resin impregnation rate of the entire rod pipe formed by winding the first prepreg three or more times Is 30 wt% or less, and the first prepreg is divided so that the number of continuous windings is at most two.