JPH04348769A - Golf club shaft - Google Patents

Abstract

PURPOSE:To provide the golf club shaft made of a fiber reinforced composite resin material which is light in weight, is improved in mechanical strength, such as torsional fracture strength, and is further improved in impact resistance and the touch at the time of use. CONSTITUTION:A composite layer 1' laminated with a fiber reinforced composite resin material layer, a resin film layer and a metallic film layer is provided between an angle layer 101' and straight layer 102' of the golf club shaft. Since the composite layer 1' has the resin film layer and the metallic foil layer, the shaft is light in weight and is improved in the mechanical strength, such as torsional fracture strength; further, the impact resistance is improved as well and the touch at the time of use is good.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a golf club shaft comprising a plurality of fiber-reinforced composite resin material layers, and more particularly, the present invention relates to a golf club shaft comprising a plurality of fiber-reinforced composite resin material layers. The present invention relates to a golf club shaft in which one of the inner layers is provided with a composite layer in which a fiber-reinforced composite resin material layer having one or more types of reinforcing fibers, a resin film layer, and a metal foil layer are laminated.

0002

[Prior Art] In recent years, carbon fiber reinforced golf club shafts have been made using prepregs having carbon fibers as reinforcing fibers because they are lightweight, have high mechanical strength, and have good vibration damping properties. Shafts made of composite resin materials are often used and have achieved good results.

[0003] Such golf club shafts are composed of multiple layers of carbon fiber-reinforced composite resin material.
As shown in FIG. 6, a predetermined number of carbon fiber reinforced prepregs 101 cut into predetermined shapes and dimensions are placed on a mandrel 100.
The matrix resin of the prepreg 101 is cured to make the prepreg 101 a carbon fiber reinforced composite resin material. At this time, in order to improve torsion and bending performance, as shown in FIG. θ
As shown in FIG. 8, the prepreg 101 (angle layer 101') is arranged so as to be inclined by an angle of θ=35° to 45°, and the carbon fiber is arranged to be inclined by an angle of θ=0 Prepreg 102 arranged at
(straight layer 102') is used, basically,
As shown in FIG. 6, prepreg 101 (angle layer 101') is often used for the inner layer of a golf club shaft, and prepreg 102 (straight layer 102') is often used for the outer layer.

0004

[Problems to be Solved by the Invention] However, in order to further prevent breakage, increase flight distance, etc., it is necessary to improve the strength of golf club shafts made of fiber-reinforced composite resin materials, particularly to improve the torsional fracture strength, and further improve the impact resistance. It is desired to improve the feel of the product and the feel during use.

An object of the present invention is to provide a golf club shaft made of a fiber-reinforced composite resin material that is lightweight, has improved mechanical strength such as torsional fracture strength, and also has improved impact resistance.

[0006]

[Means for Solving the Problems] The above objects are achieved by the composite prepreg according to the present invention. In summary, the present invention:
In a golf club shaft comprising a plurality of fiber-reinforced composite resin material layers, a composite layer in which a fiber-reinforced composite resin material layer having one or more types of reinforcing fibers, a resin film layer, and a metal foil layer are laminated, A golf club shaft characterized in that the golf club shaft is provided at least between the fiber-reinforced composite resin material layers, in either the outermost layer or the innermost layer. Preferably, the resin film layer of the composite layer has a thickness of 5 to 100 μm, the metal foil layer has a thickness of 5 to 50 μm, and the total thickness is 20 to 300 μm. The lamination order of the fiber-reinforced composite resin material layer, the resin film layer, and the metal foil layer of the composite layer is the order of the fiber-reinforced composite resin material layer, the resin film layer, and the metal foil layer, or the resin film layer, the fiber-reinforced composite resin material layer. , a metal foil layer, or a fiber-reinforced composite resin material layer, a metal foil layer, and a resin film layer.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A golf club shaft according to the present invention will be explained in detail below with reference to the drawings.

FIG. 1 is a sectional view showing one embodiment of the golf club shaft of the present invention. The golf club shaft of the present invention includes a fiber-reinforced composite resin layer 101 in which carbon fibers are arranged so as to be inclined to each other by an angle (θ) (usually θ = 35° to 45°) with respect to the axis of the golf club shaft. A fiber-reinforced composite resin layer 102 in which carbon fibers are arranged parallel to the axis of the golf club shaft, and a composite prepreg 1 are disposed on the outermost layer of the fiber-reinforced composite resin layer 102, and are manufactured by curing. Ru.

That is, according to the present invention, the angle layer 10
1', a straight layer 102', and a composite layer 1 in which a fiber-reinforced composite resin material layer, a resin film layer, and a metal foil layer are laminated.
′ is formed. Although the angle layer 101' is shown as the inner layer in FIG. 1, it is also possible to use the straight layer 102' as the inner layer. Further, the angle layer 101' and the straight layer 102' do not need to be one layer, but can be a plurality of layers if necessary.

[0010] Angle layer 101' and straight layer 10
Fiber-reinforced composite resin layers 101 and 1 for forming 2'
For 02, ordinary carbon fiber reinforced prepreg can be used. In other words, carbon fiber reinforced prepreg 101,
No. 102 uses carbon fiber (including graphite fiber) as the reinforcing fiber, and as the matrix resin, thermosetting resin such as epoxy resin, unsaturated polyester resin, polyurethane resin, diallyl phthalate resin, and phenol resin is used. Matrix resins can be used. Furthermore, the curing temperature is 5
A curing agent and other imparting agents, such as a flexibility imparting agent, are appropriately added so that the temperature is 0 to 200°C.

[0011] Of course, the angle layer 101' and the straight layer 102' may be formed using various prepregs well known to those skilled in the art, using fibers other than carbon fibers such as glass fibers as reinforcing fibers. It is also possible to form

Next, the composite layer 1', which is a feature of the present invention, will be explained in detail. FIG. 4 shows a composite layer 1′ according to the present invention.
This is a composite prepreg 1 used for forming.

[0013] The composite prepreg 1 is composed of a fiber-reinforced composite resin layer 3 having one or more types of reinforcing fibers 2, a resin film layer 4, and a metal foil layer 5, which are laminated in any order. In this example, a resin film layer 4 is laminated on a fiber-reinforced composite resin layer 3 having carbon fibers as reinforcing fibers 2,
A metal foil layer 5 is laminated on the resin film layer 4.

The fiber-reinforced composite resin layer 3 is made by impregnating matrix resin 6 between reinforcing fibers, that is, carbon fibers 2 arranged in one direction. In the present invention, this carbon fiber 2 also means graphite fiber, and graphite fiber can also be used as the carbon fiber 2.

As the matrix resin 6, thermosetting matrix resins such as epoxy resin, unsaturated polyester resin, polyurethane resin, diallyl phthalate resin, and phenol resin can be used. Furthermore, the curing temperature is 5
A curing agent and other imparting agents, such as a flexibility imparting agent, are appropriately added so that the temperature is 0 to 200°C.

To give a preferred example, epoxy resin is preferred as the matrix resin, and usable epoxy resins include, for example, (1) glycidyl ether-based epoxy resins (bisphenol A, F, S-based epoxy resins, Novolak epoxy resin, brominated bisphenol A
(2) Cycloaliphatic epoxy resin; (
3) Glycidyl ester type epoxy resin; (4) Glycidylamine type epoxy resin; (5) Heterocyclic epoxy resin; and one or more types selected from various other epoxy resins, particularly bisphenol A. , F, S glycidylamine-based epoxy resins are preferably used. In addition, as the curing agent, amine-based curing agents such as dicyandiamide (DICY) and diaminophenyl sulfone (D
DS), diaminodiphenylmethane (DDM); acid anhydride systems, such as hexahydrophthalic anhydride (HHPA),
Although methylhexahydrophthalic anhydride (MHHPA) and the like are used, amine-based curing agents are particularly preferably used.

The blending ratio of the carbon fibers 2 and matrix resin 6 in the fiber-reinforced composite resin layer 3 can be adjusted as desired, but generally the ratio by weight of carbon fibers:matrix resin=30 to 80:
A good range is 20 to 70, preferably 40 to 75:25.
~60. If the proportion of carbon fibers 2 is less than 30% by weight, when the matrix resin 6 is cured to form the fiber-reinforced composite resin layer 3 into a fiber-reinforced composite resin material, the strength of the composite resin material due to reinforcement with the carbon fibers 2 will be insufficient. It becomes enough, and on the other hand, it becomes 80
If it exceeds % by weight, the amount of matrix resin 6 is too small, and there is a possibility that the strength of the matrix resin 6 of the composite resin material will not be sufficient.

In the present invention, the resin film layer 4 is provided on the composite prepreg 1 in order to impart impact resistance to the golf club shaft. For this reason, the resin film layer 4 is made to be a relatively flexible layer. For such a resin film layer 4, a thermoplastic resin film such as polyurethane resin, nylon resin, modified nylon resin, polyethylene terephthalate resin, polyvinyl chloride resin, polycarbonate resin, polyvinylidene chloride resin, ethyl cellulose resin, cellulose acetate resin, etc. is used. can be used.

In this case, a thermoplastic resin film having high compatibility with the matrix resin 6 can be used for the purpose of improving adhesion with the fiber-reinforced composite resin layer 3. For example, when an epoxy resin or the like is used for the matrix resin 6, examples thereof include a polyurethane resin film, a modified nylon resin film, and the like.

[0020] The thickness of the resin film layer 4 is 5 to 100 μm.
If the thickness is less than 5 μm, it is too thin and the effect of imparting impact resistance to the obtained golf club shaft cannot be obtained sufficiently, and if it exceeds 100 μm, it is too thick and the strength of the golf club shaft is reduced. It becomes impossible to ignore.

[0021] In the present invention, the metal foil layer 5 is provided on the composite prepreg 1 in order to impart mechanical strength to the resulting golf club shaft, thereby improving the desired torsional fracture strength. . For the metal foil layer 5, a foil-like or thin-plate metal sheet, a metal net, or a porous foil-like or thin-plate metal mesh such as expanded metal can be used. The thickness of the metal foil layer 5 is 5 to 50 μm. The thickness of the metal foil layer 5 is 5μ
If it is less than m, it is too thin and the effect of improving the mechanical strength such as compressive strength and torsional fracture strength of the fiber-reinforced composite resin material molded product obtained cannot be sufficiently obtained. On the other hand, if it exceeds 50 μm, it will be too thick, resulting in poor workability during molding and an excessive increase in weight of the resulting golf club shaft.

Metal materials that can be used for the metal foil layer 5 include aluminum, titanium, iron, copper, nickel, nichrome, tin, lead, magnesium, gold, silver, platinum, and various other metals and alloys thereof. . For example, aluminum foil with a thickness of 20 to 50 μm manufactured by Showa Aluminum Co., Ltd., titanium foil with a thickness of 5 to 30 μm manufactured by Takeuchi Metal Foil & Powder Industry Co., Ltd., stainless steel foil with a thickness of 15 to 50 μm, high strength steel foil, etc. It can be used suitably.

On the surface of this metal foil layer 5, a metal foil layer 5 is laminated on the resin film layer 4 on which it is laminated, or on the fiber reinforced composite resin layer 3, or on the fiber reinforced composite resin layer 3.
When the metal foil layer 5 is laminated between the resin film layer 4 and the resin film layer 4, the metal foil layer 5 is formed by mechanically or physically forming holes, adding lines, or providing unevenness in order to improve the adhesion with these layers. Surface treatments such as roughening can be applied to the surface. Alternatively, the surface of the metal foil layer 5 is treated with a functional group that interacts with the matrix resin 6 of the fiber-reinforced composite resin layer 3 by a chemical method such as potassium dichromate, sodium dichromate, parkerizing, or ACP method. be able to. Metal foil layer 5
When the material is made of steel or aluminum, anodizing is also effective.

[0024] The overall thickness of the composite prepreg 1 is 20 to 3
It is appropriate to set it to 00 μm. If the thickness of the composite prepreg is less than 20 μm, it is too thin, making it difficult to manufacture the composite prepreg and not only making it impractical for use in making golf club shafts. Also, the thickness is 300μm
If it exceeds 100%, the thickness will be too thick and it will be difficult to create a golf club shaft with good moldability.

The composite prepreg 1 of this example can be manufactured by any method, but a prepreg in which matrix resin 6 is impregnated between carbon fibers 2 arranged in one direction is used as the fiber-reinforced composite resin layer 3. Then, when producing the prepreg by the hot roll method, the above resin film is attached instead of the cover film to the side opposite to the side to which the release paper is attached to form the resin film layer 4, The metal foil layer 5 can be suitably manufactured by pressing and pasting the above-mentioned metal sheet or mesh onto the resin film layer 4 using, for example, a roller. However, it is not limited to this.

[0026] Such a composite prepreg 1 is used as the outermost layer.
~ According to the golf club shaft manufactured by winding two layers, it is not only lightweight, but also has layers of fiber-reinforced composite resin material of composite layer 1' made of composite prepreg 1 laminated in a single layer to multiple layers. Since the metal foil layer 5 is provided between them, the torsional fracture strength and impact resistance are improved, and since the resin film layer 4 is also provided, the impact resistance is further improved. The feel (hitting feeling) is also good.

FIG. 2 is a sectional view showing another embodiment of the golf club shaft of the present invention. The golf club shaft of this embodiment has a composite layer 1 on the innermost layer of the angle layer 101'.
It is characterized by the formation of . Other points are similar to the embodiment shown in FIG. The composite layer 1' is obtained by curing the composite prepreg 1 disposed in the innermost layer of the fiber-reinforced composite resin layer 101.

FIG. 3 is a sectional view showing still another embodiment of the golf club shaft of the present invention. The golf club shaft of this embodiment is characterized in that a composite layer 1' is formed between an angle layer 101' and a straight layer 102'. Other points are similar to the embodiment shown in FIG. Composite layer 1
' is obtained by curing the composite prepreg 1 disposed between the fiber-reinforced composite resin layer 101 and the fiber-reinforced composite resin layer 102.

In all of the above embodiments, the composite prepreg 1 has a resin film layer 4 on the fiber-reinforced composite resin layer 3.
The fiber-reinforced composite resin layer 3 is laminated on the resin film layer 4, and the metal foil layer 5 is laminated thereon. The metal foil layer 5 may be laminated on the reinforced composite resin layer 3, and the resin film layer 4 may be laminated thereon.

Although carbon fiber was used as the reinforcing fiber 2,
Inorganic fibers such as boron fibers, glass fibers, alumina fibers, silicon carbide fibers, and silicon nitride fibers; organic fibers such as aramid fibers, polyarylate fibers, and polyethylene fibers; or metal fibers such as titanium fibers, amorphous fibers, and stainless steel fibers. can be used arbitrarily. Further, although the reinforcing fibers 2 are arranged in one direction, the reinforcing fibers 2 may be arranged in two or more directions, or may be arranged in a cross pattern.

Furthermore, as shown in FIG. 5, it is also possible to use a composite prepreg 1 in which, in addition to the carbon fiber 2, fibers 7 of a different type are used as reinforcing fibers in the fiber-reinforced composite resin layer 3 to hybridize the reinforcing fibers. .

The above-mentioned different types of fibers 7 are arranged in the matrix resin 6 of the fiber-reinforced composite resin layer 3 in the same direction as the carbon fibers 2 at predetermined intervals. In this example, the fiber diameter is 2 to 30
The carbon fiber 2 has a fiber diameter of 50 μm, whereas the fiber diameter of the different fiber 7 is 50 μm.
Although the above-described diameter is large, the different fibers 7 do not have to have a large diameter. When using the different types of fibers 7 in the form of strands with small fiber diameters, the strand diameter of the different types of fibers 7 is given as the converted diameter D0 = n1/2 × d (n: number of bundled fibers, d: fiber diameter). , the strand diameter is the converted diameter D0
A maximum of 500 μm can be used. Furthermore, as shown in FIG. 5, the different types of fibers 7 are preferably located in the middle of the composite prepreg, but may be slightly biased above and below the center.

Such a fiber-reinforced composite resin layer 3 can be produced by various methods, but two sheets of prepreg in which carbon fibers 2 are arranged in one direction are used, and different types of fibers 7 are arranged in the same direction as the carbon fibers 2 between them. They can be manufactured very suitably by arranging them at predetermined intervals and integrating them by pressing and/or heating.

[0034] Also in this composite prepreg, as usual,
The main purpose of hybridizing reinforcing fibers is to compensate for physical properties or other physical properties that are insufficient with one type of reinforcing fiber, and therefore, the different types of fibers 7 are generally other than carbon fibers, but in some cases is one carbon fiber 2
Carbon fibers can also be used as the different fibers 7 if they have different fiber diameters and physical properties. In addition to carbon fibers with different physical properties, the different types of fibers 7 include inorganic fibers such as boron fibers, glass fibers, alumina fibers, silicon carbide fibers, and silicon nitride fibers;
Organic fibers such as aramid fibers, polyarylate fibers, and polyethylene fibers; or titanium fibers, amorphous fibers,
Metallic fibers such as stainless steel fibers can optionally be used.

The blending ratio of the carbon fibers 2, different types of fibers 7, and matrix resin 6 in the fiber-reinforced composite resin layer 3 can be set arbitrarily, but generally the ratio by weight of carbon fibers: different types of fibers: matrix resin is 40 to 80:2. -20: A range of 20-60 is good.

The present invention will be further explained based on specific examples.

[0037] Composite prepreg 1 was prepared according to the present invention,
A golf club shaft was manufactured by using it in combination with ordinary prepreg. The manufacturing method is as follows.

[0038] An angle layer of P with a thickness of 120 μm and a resin content of 32% was applied to a mandrel in the shape of a golf club shaft.
AN-based carbon fiber prepreg (manufactured by Toray Industries, Inc., product name M
-40) is wound at +45° and -45° in total 8 layers, and on top of that, a straight layer with a thickness of 120 μm and a resin amount of 32
% PAN-based carbon fiber prepreg (manufactured by Toray Industries, Inc., trade name T-300) was wound in one layer, and further, as a second straight layer, two layers of composite prepreg 1 of the present invention were wound. Next, one layer of glass fiber unidirectional prepreg with a thickness of 70 μm was wrapped for surface polishing, and finally, E-glass prepreg was wrapped as a reinforcing layer to reinforce the tip, and then taped with polypropylene stretched tape and heated. After curing, a prescribed finishing process such as polishing was performed to prepare a golf club shaft.

The obtained golf club shaft was assembled into a golf club after measuring its mechanical properties such as torsional fracture strength and impact strength, and the feel at impact was tested. For comparison, a composite prepreg was prepared that did not meet the conditions of the present invention, and was used and tested in the manufacture of golf club shafts in the same manner as above. The results obtained are shown in Table 1.

[0040]

[Table 1]

In Table 1, prepreg indicates a fiber-reinforced composite resin layer 3, and foil/prepreg/film indicates a fiber-reinforced composite resin layer 3 laminated on a resin film layer 4, and a metal layer on the fiber-reinforced composite resin layer 3. This shows that the foil layer 5 is laminated. This also applies to other layer configurations. The numerical values after the reinforcing fibers and different types of fibers indicate the blending ratio (wt%) in the fiber-reinforced composite resin layer 3, and the remainder is the amount of matrix resin. Also, the symbol ◎ indicates very good, ◯ indicates good, △ indicates slightly poor, and × indicates poor.

The carbon fibers of the reinforcing fibers in Table 1 have a fiber diameter of 7.
．． 0 μm PAN-based carbon fiber (manufactured by Toray Industries, Inc., trade name T-300) was used. The different types of glass fibers are glass fibers with a fiber diameter of 7.0 μm (manufactured by Asahi Fiberglass Co., Ltd., standard name: E-Glass), and the aramid fibers are aramid fibers with a fiber diameter of 12 μm (manufactured by Teijin Ltd., trade name: Technora). ), the polyarylate fiber has a fiber diameter of 23 μm.
polyarylate fiber (manufactured by Kuraray Co., Ltd., trade name Vectran) was used. Epoxy resin was used as the matrix resin. The stainless steel foil used was made by Takeuchi Metal Foil and Powder Industries Co., Ltd. and had a thickness of 20 μm. The titanium foil used was one manufactured by Takeuchi Metal Foil and Powder Industries Co., Ltd. and having a thickness of 20 μm. Both modified nylon films had a thickness of 20 μm.

[0043] As shown in Table 1, in Examples 1 to 7, a composite prepreg having a metal foil layer and a resin film layer was used in combination with an ordinary carbon fiber prepreg, so the resulting golf club shaft did not twist. Both the breaking strength and impact resistance were improved to better or better, and the feeling of use of the golf club was also maintained to be better than good. On the other hand, Comparative Examples 1 and 2
In Comparative Example 3, no film layer was provided on the combined composite prepreg, so the impact resistance was slightly inferior, and in Comparative Example 3, a metal foil layer was not provided on the composite prepreg, resulting in poor torsional fracture strength and poor usability of the golf club. That's the result.

[0044]

As explained above, the present invention provides a golf club shaft comprising a plurality of fiber-reinforced composite resin material layers, a fiber-reinforced composite resin material layer having one or more types of reinforcing fibers, a resin A composite layer consisting of a film layer and a metal foil layer is provided at least between the layers of the plurality of fiber-reinforced composite resin material layers, either the outermost layer or the innermost layer, so it is lightweight and resistant to twisting. The strength is improved, the impact resistance is also improved, and the feel during use is also good.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of a golf club shaft of the present invention.

FIG. 2 is a sectional view showing another embodiment of the golf club shaft of the present invention.

FIG. 3 is a sectional view showing still another embodiment of the golf club shaft of the present invention.

FIG. 4 is a sectional view showing a composite prepreg used in the present invention.

FIG. 5 is a sectional view showing another example of the composite prepreg used in the present invention.

FIG. 6 is a sectional view showing a conventional golf club shaft.

FIG. 7 is a diagram illustrating a method for manufacturing a golf club shaft.

FIG. 8 is a plan view showing a prepreg for manufacturing a golf club shaft.

[Explanation of symbols]

1 Composite prepreg 1' Composite layer 3 Fiber reinforced composite resin layer 4
Resin film layer 5 Metal foil layer 101' Angle layer 102' Straight layer

Claims (2)

[Claims] Claim 1: A golf club shaft comprising a plurality of fiber-reinforced composite resin material layers, a composite comprising a fiber-reinforced composite resin material layer having one or more types of reinforcing fibers, a resin film layer, and a metal foil layer. A golf club shaft characterized in that a layer is provided at least between the plurality of fiber-reinforced composite resin material layers, either the outermost layer or the innermost layer. [Claim 2] The thickness of the resin film layer of the composite layer is 5 or more.
2. The golf club shaft according to claim 1, wherein the metal foil layer has a thickness of 5 to 50 μm and a total thickness of 20 to 300 μm.