JPH07329196A - Synthetic resin tube reinforced by fiber - Google Patents

Abstract

PURPOSE:To obtain a fiber-reinforced synthetic resin tube with excellent compressive force in a diametral direction and a torsion force in a peripheral direction by forming a skin of fiber-reinforced synthetic resin over the outer surface of a bundle of tapered fiber-reinforced synthetic resin tubes coming into contact with each other. CONSTITUTION:A skin 2 consisting of a fiber-reinforced synthetic resin is formed on the outer surface of a bundle of tapered fiber-reinforced synthetic resin the tubes 3 (composed of an epoxy resin or phenol resin as the synthetic resin and a carbon fiber or glass fiber as the reinforcing fiber) coming into contact with each other. This fiber-reinforced synthetic resin tube 1 is a cylindrical tube whose outer diameter contracts uniformly to one end. The degree of a diametral contraction of the outer shape into one direction of the tube axial line should preferably be 6/1000 to 7/1000. In addition, the number of fine tubes should preferably be 4 to 10. In the case of a golf club shaft, it should preferably be tapered, and the degree of the taper should preferably by 7/1000 to 9/1000.

Description

Detailed Description of the Invention

[0001]

This invention relates to a fiber reinforced synthetic resin pipe,
In particular, the present invention relates to a fiber-reinforced synthetic resin tube that can be used for a shaft of a golf club or a fishing rod.

[0002]

2. Description of the Related Art A prepreg made by impregnating carbon fiber, glass fiber or the like with a synthetic resin is wrapped around a tapered mandrel whose cross-section is perpendicular to the axis, and the outer periphery is wrapped with a special tape for molding. Is heat-cured and the mandrel is pulled out to produce a fiber-reinforced synthetic resin pipe.
The fiber-reinforced synthetic resin pipe manufactured by the above method has a perfect circular cross section perpendicular to the axis.

[0003]

In the prior art, in order to improve the strength of the fiber-reinforced synthetic resin pipe, the fiber type, the fiber amount, the resin amount, the fiber orientation, etc. in the fiber-reinforced synthetic resin pipe are adjusted. However, adjustment by adjusting these amounts is limited due to the restriction of the outer diameter. The invention of this application is
The purpose is to improve the strength of a fiber-reinforced synthetic resin tube, in particular to manufacture a tube that is strong against the compressive force in the radial direction and the twisting force in the circumferential direction, or to reduce the weight.

[0004]

The inventor of the present application has conducted extensive studies to achieve the above-mentioned object, and as a result, a plurality of tapered fiber-reinforced synthetic resin pipes were attached to the outside of a bundle of pipes, and fiber-reinforced It was discovered that a fiber reinforced synthetic resin tube having a structure formed with an outer cover made of synthetic resin can be a tube that is strong against the compressive force in the radial direction and the twisting force in the circumferential direction, and completed the invention of this application. did. That is, the fiber-reinforced synthetic resin pipe of the invention of this application is characterized in that an outer skin made of fiber-reinforced synthetic resin is formed on the outside of a bundle formed by bringing a plurality of tapered fiber-reinforced synthetic resin pipes into contact with each other.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The invention of the present application will be described below with reference to the accompanying drawings, but the invention of the present application is not limited thereto, and various modifications can be made without departing from the technical idea of the invention of the present application. FIG. 1 is a perspective view showing a fiber reinforced synthetic resin pipe 1 (hereinafter, simply referred to as a pipe 1) according to an embodiment of the present invention, and FIG. 2 is a schematic sectional view taken along line XX of FIG.
The tube 1 is a cylindrical tube whose outer diameter is uniformly reduced at one end. The degree of outer diameter reduction in one direction of the axis is
6/1000 to 10/1000 is preferable, 6/100
0-7 / 1000 is particularly preferred.

As can be seen from FIG. 2, the tube 1 is provided with an outer skin 2 on the outer side of a bundle in which a plurality of thin tubes 3, 3 ...
Is formed. Here, both the thin tubes 3 ... And the outer skin 2 are made of a fiber-reinforced compatible resin made of a material described later. The number of thin tubes is preferably 4 to 17, and particularly preferably 4 to 10. The cross-sectional shape of the thin tube may be any shape, but a circle, octagon, or hexagon is particularly preferable.

The capillaries can be simple cylindrical, but are preferably tapered corresponding to the taper on the outside of the final tube. Particularly, in the case of a golf club shaft, it is preferable that the thin tube has a tapered shape, and the degree of the taper is 7/1000 to 9/100.
It is preferably 0. In this case, the thickness of the tube is preferably 2 to 4 mm at the large diameter end and 0.7 to 4 mm at the small diameter end.

As the fiber reinforced synthetic resin of the material forming the tube, vinyl ester resin, polyester resin, unsaturated polyester resin and the like are used in addition to epoxy resin and phenol resin, of which epoxy resin and phenol resin are preferred. Epoxy resins are particularly preferred.

Examples of the reinforcing fiber include carbon fiber, glass fiber, various ceramic fibers, boron fiber, metal fiber such as copper and stainless steel, amorphous fiber, organic fiber such as aromatic polyamide (for example, Kevlar fiber, Tyranno fiber). A mixed fabric thereof is used, and among them, carbon fiber and glass fiber are preferable, and carbon fiber is particularly preferable. When phenol resin is used as the matrix resin, glass fiber is preferable.

The thickness of the reinforcing fiber is generally 3 to 13 μm.
m is preferable and 3 to 4 μm is particularly preferable. The thin tube 3 and the outer cover 2 may be made of the same material (resin and reinforcing fiber) or may be made of different materials.

The proportion of reinforcing fibers in the prepreg sheet is preferably 65 to 70% by weight for both the thin tube and the outer skin, but particularly for the sheet for producing thin tubes, 67 to 70% by weight.
It is preferably in the range of 60 to 65% by weight for the outer skin sheet. Since the fiber-reinforced synthetic resin tube of the invention of this application has a thin tube in the tube, buckling strength, impact strength, bending strength and the like are improved.

The reinforced synthetic resin pipe of the present invention uses, for example, a prepreg sheet obtained by impregnating the above-mentioned reinforcing fibers with the above-mentioned synthetic resin and using a mandrel having a small diameter.
Manufacturing multiple fiber-reinforced synthetic resin capillaries (sheet winding method). Then, the thin tubes are put together into a bundle. It is manufactured by winding a prepreg sheet made of the above material around the bundle (sheet winding method), wrapping a pipe member with a special molding tape (for example, polypropylene tape), and heat curing.

The manufacturing method for the thin tube and the outer skin formed on the outer side thereof is basically the same, but a specific manufacturing method is as follows: a reinforcing fiber is impregnated with a synthetic resin, and a unidirectionally aligned sheet and / or A fiber-reinforced synthetic resin tube is manufactured by winding a woven cloth on a mandrel for a thin tube, winding a resin-impregnated roving of these fibers at an angle of 5 to 60 ° with respect to the axis, and heating and curing. You can

Further, a prepreg impregnated with a thermosetting resin is wound around the bundle of thin tubes, the outer periphery of the wound sheet is covered with a heat-shrinkable tube, and a tape is tightly wound around the outer periphery thereof. A fiber-reinforced synthetic resin tube may be manufactured by subjecting the impregnated resin to a curing treatment according to the above method and then peeling off the tape and the heat-shrinkable tube in this order for molding.

Further, a prepreg obtained by impregnating glass fiber or carbon fiber with a thermosetting resin such as phenol, epoxy or unsaturated polyester is adhered with a heat resistant film such as polyester or polypropylene, and the prepreg is subjected to the above-mentioned thin tube. The heat-resistant film side is wound around a bundle of the inner surface of the rod, and the rod-shaped body is inserted into an airtightly retainable tubular outer die whose axial inner diameter side surface is formed into a predetermined shape. After injecting air or gas into the outer mold, the tube is pressed against the inner diameter surface of the outer mold, and further heat treatment is applied to expand the air or gas to tension-contact the rod-shaped member with the inner diameter surface of the outer mold, and then the resin is cured. You may manufacture the fiber reinforced synthetic resin pipe which pulls out a rod-shaped body from an outer type | mold. In this case, as the outer mold, one having a smooth surface layer formed of a release agent on the inner diameter side surface may be used. In order to manufacture the tube of the invention of this application, a plurality of thin tubes 3 ...
And the outer skin 1 is formed by bundling them. At that time, a plurality of thin tubes 3 may be wound as they are, or they may be tied together and wound. In addition, in FIG.
A void 4 is formed between the bundle of a plurality of thin tubes 3 ...

[0016]

EFFECTS OF THE INVENTION According to the invention of the present application, since the outer shell made of the fiber-reinforced synthetic resin is formed on the outer side of the bundle formed by bringing a plurality of tapered fiber-reinforced synthetic resin tubes into contact with each other, the strength, particularly in the radial direction, is improved. The strength against the compressive force and the twisting force in the circumferential direction is improved.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a fiber reinforced synthetic resin pipe of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

[Explanation of symbols]

 1 Fiber-reinforced synthetic resin pipe 2 Fiber-reinforced synthetic resin pipe 3 Thin tube 4 Void

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Claims (2)

[Claims] 1. A fiber-reinforced synthetic resin tube characterized in that an outer cover made of fiber-reinforced synthetic resin is formed on the outside of a bundle formed by bringing a plurality of tapered fiber-reinforced synthetic resin tubes into contact with each other. 2. The fiber-reinforced synthetic resin tube according to claim 1, wherein the number of the thin tubes is 4 to 10.