JPH03247363A - Golf club shaft - Google Patents

Abstract

PURPOSE:To increase mechanical characteristics such as tensile strength, compressive strength, etc., and obtain a good feeling on using and further get a good form-working property and appearance, by providing a hybrid prepreg layer between carbon fiber-reinforced resin layers and/or in the outermost layer. CONSTITUTION:A hybrid prepreg layer is provided in such a manner that different fibers with 50-500mum in fiber dia. from reinforced fibers are arranged in the same direction with the reinforced fibers in a specified interval in reinforced fibers having 5-30mum fiber dia. between carbon fiber-reinforced layers and/or in the outermost layer for a golf club shaft made of a plurality of carbon- reinforced resin layers. It is preferable to consists of a prepreg 101 in which carbon fibers are arranged so as to be usually slanting by theta=35-45 deg. against the axial line of the golf club shaft and a prepreg 102 in which carbon fibers are arranged in parallel with each other against the axial line of the golf club shaft. And a hybrid prepreg 1 is arranged between both prepregs 101, 102. And it is made by hardening thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION 1. The present invention relates to a golf club shaft comprising a plurality of carbon fiber reinforced resin layers, and in particular, a golf club shaft comprising a plurality of carbon fiber reinforced resin layers and/or a hybrid prepreg layer between the carbon fiber reinforced resin layers and/or as the outermost layer. The invention relates to a golf club shaft characterized by the following features:

In recent years, many golf club shafts made of carbon fiber-reinforced composite resin have been used because they are lightweight, have high mechanical strength, and have good vibration damping properties. , has achieved good results.

Such a conventional golf club shaft is composed of a plurality of carbon fiber reinforced composite resin layers, and as shown in FIG. It is formed by winding it around a mandrel 100 and curing it. At this time, in order to improve torsion and bending performance, as shown in FIG. Prepreg 101 (angle layer 101
°) and a prepreg 102 (straight layer 102') in which carbon fibers are arranged parallel to the axis of the golf club shaft (θ=0°), as shown in FIG. Specifically, as shown in FIG. 5, prepreg 101 (angled layer 101°) is often used for the inner layer of a golf club shaft, and prepreg 102 (straight layer 102°) is used for the outer layer.

However, in order to prevent breakage and increase flight distance, it is desired to improve mechanical properties such as tensile strength, compressive strength, elastic modulus, and stickiness. Furthermore, further improvements are desired in terms of feel during use (hitting feel), moldability, and aesthetics.

As a result of many research experiments, the present inventors have found that in a golf club shaft consisting of multiple carbon fiber reinforced resin layers, carbon fiber reinforced resin can be used between the carbon fiber reinforced resin layers or as the outermost layer. Between the resin layers and as the outermost layer, a hybrid prepreg layer formed of a hybrid prepreg in which reinforcing fibers such as carbon fibers and different types of fibers different from the reinforcing fibers are arranged in the same direction at a predetermined interval. It has been found that by providing this, it is possible to provide a golf club shaft that can satisfy the above-mentioned requirements.

The present invention has been made based on this new knowledge.

Therefore, the purpose of the present invention is to improve mechanical properties such as tensile strength, compressive strength, elastic modulus, and stickiness, to prevent breakage and increase flight distance, and to improve the feel of the product during use. Another object of the present invention is to provide a golf club shaft that is improved in terms of moldability and aesthetics.

The above objects are achieved with the golf club shaft according to the present invention. In summary, the present invention provides a golf club shaft comprising a plurality of carbon fiber reinforced resin layers, in which reinforcing fibers contain a different type of reinforcing fiber between the carbon fiber reinforced resin layers and/or in the outermost layer. This golf club shaft is characterized by being provided with a hybrid prepreg layer in which fibers are arranged at predetermined intervals in the same direction as the reinforcing fibers.

To explain further, in the golf club shaft according to the present invention, as shown in FIG. 1, the carbon fibers preferably have an angle (θ) (
prepregs 101 arranged to be inclined by θ=35° to 45°) and prepregs 102 in which carbon fibers are arranged parallel to the axis of the golf club shaft
The hybrid prepreg 1 is disposed between the two prepregs 101 and 102, and is manufactured by curing. That is, according to the present invention, the angle layer 101',
Hybrid prepreg Nl° and straight layer 102
A golf club shaft is formed. Further, the hybrid prepreg layer 1' can be provided as the outermost layer as shown in FIG. 2, or between the angle layer 101' and the straight layer 102' and the It can also be provided on the outer layer.

In FIGS. 1 and 2, the angled layer 101' is shown as the inner layer, but 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, and can be formed into a plurality of layers if necessary.

The angled layer 101° and the straight layer 102′ can be formed using conventional carbon fiber reinforced prepregs 101, 102.

In other words, carbon fiber reinforced prepreg 1.01.102 is
Carbon fiber (including graphite fiber) is used as the reinforcing fiber, and thermosetting matrix resins such as epoxy resin, unsaturated polyester resin, polyurethane resin, diallyl phthalate resin, and phenol resin can be used as the matrix resin. be. Furthermore, the curing temperature is 50 to 500
A curing agent and other imparting agents, such as a flexibility imparting agent, are appropriately added so that the temperature becomes .degree.

Next, the hybrid prepreg layer 1 which is a feature of the present invention
° will be explained in more detail with reference to Examples.

Large “L floor” 2 FIG. 6 shows a hybrid prepreg layer 1° according to the present invention.
Hybrid prepreg used to form l
An example of this is shown.

According to this embodiment, in a prepreg 4 having carbon fibers as reinforcing fibers 2 having a fiber diameter of 5 to 30 μm, dissimilar fibers 6 having a fiber diameter of 50 to 500 μm are placed in the same direction as the carbon fibers. They are arranged at predetermined intervals.

At this time, the different types of fibers 6, as shown in FIG.
Although it is preferable to position it in the center of the unidirectional carbon fiber prepreg 4, the same effect can be achieved even if it is placed slightly off the center as shown in FIG.

The hybrid prepreg 1 having such a structure can be manufactured by various methods, but in particular, between two unidirectional carbon fiber reinforced prepregs using carbon fibers as reinforcing fibers, a different type of fiber is mixed with the same carbon fiber. It is very suitably manufactured by arranging the parts at predetermined intervals in the direction and integrating them by pressing and/or heating.

To explain further, as shown in FIG.
The fiber diameter is 5 to 30 μm as the reinforcing fiber 2 held in
On the first carbon fiber-reinforced prepreg 4A having carbon fibers, the fibers are arranged in the same direction as the arrangement direction of the carbon fibers 2 of the first carbon fiber-reinforced prepreg 4A, and the fiber diameter is the same as that of the carbon fibers. Different types of fibers 6 having a relatively large fiber diameter of 50 to 500 μm were arranged, and the different types of fibers 6 were further held in a release paper lO similar to that of the first carbon fiber reinforced prepreg 4A. The second carbon fiber-reinforced prepreg 4B is superimposed on the second carbon fiber-reinforced prepreg 4A.
, 4B toward each other and/or heat the first carbon fiber reinforced prepreg 4A, the dissimilar fibers 6 and the second carbon fiber reinforced prepreg 4B.
The carbon fiber reinforced prepregs 4B are joined together to form the sixth
A hybrid prepreg l according to this embodiment as illustrated in the figure or FIG. 7 is formed. Such a method is preferably carried out in a drum winder.

The carbon fibers serving as the reinforcing fibers 2 of the first and second carbon fiber reinforced prepregs 4A and 4B may be the same carbon fiber, or may be carbon fibers with different strengths.

Furthermore, different types of reinforcing fibers may be used for the prepreg 4A and the prepreg 4B.

In this way, the reinforcing fibers 2 are not limited to carbon fibers, and may also include inorganic fibers such as boron fibers with small fiber diameters, glass fibers, alumina fibers, silicon carbide fibers, and silicon nitride fibers; aramid fibers, Organic fibers such as polyarylate fibers and polyethylene fibers; or metal fibers such as titanium fibers, amorphous fibers, and stainless steel fibers having small fiber diameters can be arbitrarily used.

The reinforcing fiber 2 has a fiber diameter of 5 to 30 μm, preferably 6 to 12 μm.

As the different fibers 6, inorganic fibers such as boron fibers, which have a larger fiber diameter than the reinforcing fibers 2, and metal fibers such as titanium fibers, amorphous fibers, and stainless steel fibers are preferably used. is 50~150μ
m, preferably 70 to 120 μm.

Furthermore, according to this embodiment, inorganic fibers such as glass fibers, alumina fibers, silicon carbide fibers, and silicon nitride fibers 1 organic fibers such as aramid fibers, polyarylate fibers, and polyethylene fibers can also be used as the different fibers 6. can. However, in general, these fibers f have a small fiber diameter, that is, a monofilament diameter (d) of 5 to 50 μm. As shown in the figure, it is used in the form of a strand (fiber bundle) 6 made by bundling a large number of fibers f.

Therefore, it is also possible to use metal fibers with small fiber diameters in the form of strands.

Different types of fibers 6 in the form of such strands
In this specification, the fiber diameter is defined as the converted diameter D0 expressed by the following formula.

D o = -rT Needle d n: Number of convergent strands d: Fiber diameter Also, when such strands are used as the different fibers 6, regardless of the presence or absence of twisting, a hybrid prepreg is formed as shown in FIG. 1, it does not exist in the form of a circular cross section with a converted diameter D0 (usually, it is deformed into a flat state. Therefore, as described above, boron having a large fiber diameter is used as the dissimilar fiber 6. In order to produce a hybrid prepreg 1 having the same thickness (T) as when fibers, titanium fibers, amorphous fibers, stainless steel fibers, etc. are used, the fiber diameter when the strands are used as the different fibers 6, i.e. , the converted diameter D0 is
Preferably, the maximum thickness is 500 μm.

For example, for organic fibers such as polyarylate fibers whose fiber diameter d is 23 μm, by harvesting 300 trees, the converted diameter D0 is 398 μm, and when the fiber diameter d is 13 μm.
By collecting 800 glass fibers, the converted diameter D0 is set to 368 μm, and both of these strands are also suitably used as the different fibers 6 to form a hybrid prepreg 1 as shown in FIG. can be manufactured.

As the matrix resin, thermosetting matrix resins such as epoxy resin, unsaturated polyester resin, polyurethane resin, diallyl phthalate resin, and phenol resin can be used. Further, a curing agent and other imparting agents, such as a flexibility imparting agent, are appropriately added so that the curing temperature is 50 to 500°C.

To give a preferred example, epoxy resin is preferred as the matrix resin, and usable epoxy resins include (1) glycidyl ether epoxy resin (
(bisphenol A, F, S-based epoxy resin, novolac-based epoxy resin, brominated bisphenol A-based epoxy resin); (2) cycloaliphatic epoxy resin; (3) glycidyl ester-based epoxy resin: (4) glycidylamine-based epoxy Resin; (5) Heterocyclic epoxy resin; one or more selected from various other epoxy resins are used, and bisphenol A, F, and S glycidylamine-based epoxy resins are particularly preferably used. Further, as the curing agent, diaminophenyl sulfone (DDS), diaminodiphenylmethane (DDM), etc. are preferably used.

In addition, the blending ratio of reinforcing fibers, different types of fibers, and matrix resin in the hybrid prepreg of this example can be adjusted arbitrarily, but generally, in weight %, reinforcing fibers/different types of fibers: matrix resin = (40 to 80): ( 2-20):
(20-60). Further, according to the present invention, the thickness (T) of the prepreg can be made to be about the same as the fiber diameter of the different types of fibers used, but it is usually 80 to 200μ.
It will probably be about m.

Next, a case in which the hybrid prepreg of this example is produced using a drum winder will be described in more detail.

First and second carbon fiber reinforced prepregs 4A, 4 used
B has the same configuration, with a thickness of 65 μm on release paper.
It was formed in The carbon fibers used as the reinforcing fibers 2 were PAN-based carbon fibers (manufactured by Toshi Co., Ltd., trade name: rM40J) with a fiber diameter of 6.5 μm, and the matrix resin was an epoxy resin. Further, the content of matrix resin was 35% by weight.

As the different types of fibers 6, boron fibers and titanium fibers were used.

Boron fibers having a fiber diameter of 100 μm were used and arranged at intervals of 1 mm. In addition, titanium fiber has a fiber diameter of 10
Those with a diameter of 0 μm were used and arranged at intervals of 2 mm.

The hybrid prepreg 1 manufactured in this way is
A piece with a width of 300 mm and a length of 1.7 m was obtained. The thickness (T) of the hybrid prepreg using boron fiber as the different fiber 6 is 138 μm, the matrix resin content is 31.5% by weight, and the thickness of the hybrid prepreg using titanium fiber as the different fiber 6. (T) is 13
4 μm, and the matrix resin content was 32.0% by weight.

Also, using such hybrid prepreg 1,
A golf club shaft illustrated in FIGS. 1 and 2 was manufactured. The mechanical properties of the golf club shaft were measured, and although the golf club shaft of the present invention is lightweight, it has a tensile strength, compressive strength, and elastic modulus of 9.
It is superior to the conventional golf club shaft shown in FIG. 5, has a good feel during use, and has improved flight distance.

Furthermore, when the hybrid prepreg according to the present invention is provided as the outermost layer, reinforcing fibers such as carbon fibers and different types of fibers are arranged without disturbance in the length direction of the fibers, which is aesthetically pleasing. It was something. The measurement results are shown in Table 1.

! 1u硼1 According to this example, the hybrid prepreg 1 has a first
As shown in FIG. 1, among the carbon fibers 2 arranged in one direction as reinforcing fibers, boron fibers 6 and fibers 8 different from the boron fibers 6 and the carbon fibers 2 are mixed with the carbon fibers 2. They are arranged in the same direction. In the embodiment shown in FIG. 11, the boron fibers 6 and the different types of fibers 8 are arranged alternately, but the method of arranging the boron fibers 6 and the different types of fibers 8 is not limited to this. It can be arranged arbitrarily.

The boron fibers 6 and the different fibers 8 are preferably located at the center of the unidirectional carbon fiber prepreg 4 as shown in FIG. Even if they are arranged unevenly, the same effect can be achieved.

Further, according to this embodiment, the different types of fibers 8 contained in the hybrid prepreg 1 do not need to be one type, but can be a plurality of types, for example, 2.3 types of different types of different types of fibers. For example, in FIG.
An example having two different types of dissimilar fibers 8a and 8b is shown.

In this way, the different types of fibers 8 include a plurality of types of different types of fibers 8a,
8b, as shown in FIG.
A plurality of types of different fibers 8a, 8b may be arranged between them (
Alternatively, as shown in FIG. 14, a plurality of different types of fibers 8a and 8b may be alternately arranged with the boron fiber 6 as a reference. The arrangement relationship between the different types of fibers 8 (8a, 8b) and the boron fibers 6 may be arbitrarily selected as desired, as described above.

The boron fiber 6 used in this example usually has a fiber diameter of 50 to 150 um, preferably 70 to 150 um.
It is assumed to be 120 μm.

The different types of fibers 8 include titanium fibers, amorphous fibers,
Metal fibers such as stainless steel fibers are preferably used, and the diameter of the fibers usually ranges from 50 to 150 μm, preferably from 70 to 120 μm.

Furthermore, according to this embodiment, the different types of fibers 8 include glass fibers, other inorganic fibers such as alumina fibers, silicon carbide fibers, and silicon nitride fibers, or various fibers such as aramid fibers, polyarylate fibers, and polyethylene fibers. Organic fibers can also be used. As mentioned above, these fibers f are
The fiber diameter, that is, the monofilament diameter (d) is 5 to 50
Since the fibers are as small as μm, when using fibers with such a small diameter as the different fibers 8, as explained in connection with FIG. used in

Therefore, metal fibers with small fiber diameters are used in the form of strands.

For example, for organic fibers such as polyarylate fibers whose fiber diameter d is 23 μm, the equivalent diameter can be obtained by harvesting 300 trees. is 398LLm, and the fiber diameter d is 13μ
By collecting 800 glass fibers, the converted diameter D0 is set to 368 μm. Both of these strands are also suitably used as the different type of fibers 8 to form a hybrid prepreg 1 as shown in FIG. can be manufactured.

Hybrid prepreg l constructed according to this example
can be produced by various methods, but in the same way as in Example 1, boron fibers and different types of fibers are placed between two unidirectional carbon fiber reinforced blob legs using carbon fibers as reinforcing fibers. Arranged at a predetermined interval in the same direction as the fibers,
It is very suitably manufactured by integrating by pressing and/or heating.

To explain further, as shown in FIG.
On the first carbon fiber reinforced prepreg 4A having carbon fibers 2 with a fiber diameter of 5 to 30 μm, which is held at 0.0 μm, Boron fibers 6 and different fibers 8 having a fiber diameter of 50 to 500 μm, which is larger than that of carbon fibers, are arranged in the same direction, and further, the boron fibers 6
And a second carbon fiber reinforced prepreg 4B held on the same release paper 10 as the first carbon fiber reinforced prepreg 4A is superimposed in such a manner that the different types of fibers 8 are sandwiched, and the above-mentioned bidimensional fiber reinforced prepregs 4A, 4B are formed. are pressed towards each other and/
Or by heating the first carbon fiber reinforced prepreg 4
A, the boron fiber 6 and the different fibers 8, and the second carbon fiber reinforced prepreg 4B are integrally joined to form a hybrid prepreg l according to this embodiment as illustrated in FIGS. 11 to 15. Ru.

The carbon fibers 2 as the reinforcing fibers of the first and second carbon fiber reinforced prepregs 4A and 4B may be the same carbon fiber, or may be carbon fibers with different strengths. The carbon fiber 2 usually has a fiber diameter of 5 to 30μ as described above.
m, preferably 6 to 12 μm.

As the matrix resin, as in Example 1, thermosetting matrix resins such as epoxy resin, unsaturated polyester resin, polyurethane resin, diallyl phthalate resin, and phenol resin can be used. Furthermore, a curing agent and other imparting agents are added so that the curing temperature is 50 to 500°C.
For example, a flexibility imparting agent is appropriately added.

Further, the blending ratios of carbon fibers, boron fibers, different types of fibers, and matrix resins in the hybrid of this example can be adjusted arbitrarily, but in general, the ratio of carbon fibers: boron fibers: different types of fibers, matrix resin = ( 30-75): (2
-15): (2-15): (25-40). Further, according to this embodiment, the thickness (T) of the prepreg can be made to be about the same as the fiber diameter of the boron fibers and different fibers used, but it will usually be about 80 to 200 μm.

Next, a case in which the hybrid prepreg of this example is produced using a drum winder will be described in more detail.

First and second carbon fiber reinforced prepregs 4A, 4 used
B has the same configuration, with a thickness of 65 mm on the release paper 10.
It was formed in μm. The carbon fibers 2 as reinforcing fibers were PAN-based carbon fibers (manufactured by Toshi Co., Ltd., trade name: rM40J) with a fiber diameter of 6.5 μm, and the matrix resin was an epoxy resin. Further, the content of matrix resin was 33% by weight.

As the Poron fiber 6, one with a fiber diameter of 100 μm is used, and as the different type of fiber 8, a strand obtained by harvesting 300 polyarylate fibers (Pectran) with a fiber diameter of 23 μm is used. Arranged so that the distance is 2mm! did.

The hybrid prepreg l produced in this way is
A hybrid prepreg with a width of 300 mm, a length of 1.7 m, and a thickness (T) of 160 μm was obtained. The blending ratio of carbon fibers, boron fibers, different types of fibers, and matrix resins in the hybrid prepreg of this example is expressed as % by weight: carbon fibers: poron fibers: different types of fibers: matrix resin = 54.
It was 2:17 and 27.

Also, using such hybrid prepreg 1,
A golf club shaft illustrated in FIGS. 1 and 2 was manufactured. The mechanical properties of the golf club shaft were measured, and although the golf club shaft of the present invention is lightweight, it has poor string strength, compressive strength, and elastic modulus.
In terms of impact resistance, it was superior to the conventional golf club shaft shown in Fig. 5, had a good feel during use, and had a longer flight distance. In addition, when the hybrid prepreg according to the present invention is provided as the outermost layer, reinforcing fibers such as carbon fibers and different types of fibers are arranged without disorder (arranged) in the length direction of the fibers, making it aesthetically pleasing. It was preferable.Table 2 shows
The evaluation results of golf club shafts using various fibers as the different fibers 8 are shown.

11 Index 1 According to this example, the hybrid prepreg 1 uses metal fibers 6 instead of the poron fibers 6 in Example 2, and as the different fibers 8, fibers different from the metal fibers 6 and the carbon fibers 2 are used. It is manufactured using the configuration shown in FIGS. 11 to 15.

As described above, titanium fibers, amorphous fibers, stainless steel fibers, etc. are preferably used as the metal fibers 6 used in this embodiment, and as the different types of fibers 8, glass fibers, boron fibers, etc. alumina fiber,
Inorganic fibers such as silicon carbide fibers and silicon nitride fibers, or various organic fibers such as aramid fibers, polyarylate fibers, and polyethylene fibers are used.

Of course, it is possible to include multiple types of metal fibers in the same prepreg, and similarly to Example 2, multiple types of different types of fibers can be included.

The hybrid prepreg of this example uses the same matrix resin, curing agent, and other imparting agents as in Example 2, such as a flexibility imparting agent, and is prepared in the same manner as described in connection with FIG. 16. can be manufactured.

In addition, the blending ratios of carbon fibers, metal fibers, different types of fibers, and matrix resin in the hybrid prepreg of this example can be adjusted arbitrarily, but in general, in weight %, carbon fibers: metal fibers: different types of fibers/matrix resin = ( 30-70)+
(2-30): (2-30): (20-40)
It will be said that Further, according to this example, the thickness (T) of the prepreg can be made to be about the same as the fiber diameter of the metal fibers and different types of fibers used, but it is usually 80 to 200 μm.
It would be considered as a degree.

Next, a case in which the hybrid prepreg of this example is produced using a drum winder will be described in more detail.

First and second carbon fiber reinforced prepregs 4A, 4 used
B has the same configuration, with a thickness of 65 mm on the release paper 10.
It was formed in μm. The carbon fibers 2 as reinforcing fibers were PAN-based carbon fibers (manufactured by Toshi Co., Ltd., trade name: rM40J) with a fiber diameter of 6.5 LLm, and the matrix resin was an epoxy resin. Further, the content of matrix resin was 33% by weight.

As the metal fiber 6, a titanium fiber with a fiber diameter of 100 μm is used, and as the dissimilar fiber 8, a convergence of 300 filaments of polyarylate fiber (pectran) with a fiber diameter of 23 μm is used. is 2mm
They were arranged so that they were spaced apart from each other.

The hybrid prepreg 1 manufactured in this way is
A hybrid prepreg with a width of 300 mm, a length of 1.7 m, and a thickness (T) of 160 μm was obtained. The blending ratio of carbon fiber, metal fiber, different type of fiber, and matrix resin in the hybrid prepreg of this example is carbon fiber: metal fiber: different type of fiber: matrix resin = 53:4 in weight%.
:17:26.

Also, using such hybrid prepreg l,
A golf club shaft illustrated in FIGS. 1 and 2 was manufactured. The mechanical properties of the golf club shaft were measured, and although the golf club shaft of the present invention is lightweight, it has a tensile strength, compressive strength, and elastic modulus of 9.
It was also superior to the conventional golf club shaft shown in FIG. 5 in terms of stickiness and impact resistance, provided a good feel during use, and increased flight distance. Furthermore, when the hybrid prepreg according to the present invention is provided as the outermost layer, reinforcing fibers such as carbon fibers and different types of fibers are arranged without disturbance in the length direction of the fibers, which is aesthetically pleasing. It was something.

Table 3 shows the evaluation results of golf club shafts when various fibers were used as the metal fibers 6 and the different types of fibers 8.

According to this example, the hybrid prepreg 1 uses organic fibers 6 instead of the boron fibers 6 in Example 2, and as the different fibers 8, fibers different from the organic fibers 6 and the carbon fibers 2 are used. It is manufactured using the configuration shown in FIGS. 11 to 15.

As described above, various organic fibers such as aramid fibers, polyarylate fibers, and polyethylene fibers are preferably used as the organic fibers 6 used in this embodiment, and as the different types of fibers 8, glass fibers, Others: boron fiber,
Inorganic fibers such as alumina fibers, silicon carbide fibers, silicon nitride, and plain fibers are used.

Of course, it is possible to include multiple types of organic fibers in the same prepreg, and similarly to Example 2, multiple types of different types of fibers can be included.

The hybrid prepreg of this example uses the same matrix resin, curing agent, and other imparting agents as in Example 2, such as a flexibility imparting agent, and is prepared in the same manner as described in connection with FIG. 16. can be manufactured.

In addition, the blending ratio of carbon fiber, organic fiber, different type of fiber, and matrix resin in the hybrid of this example can be arbitrarily adjusted or is generally 1% by weight, and carbon fiber: organic fiber: different type of fiber, matrix resin = (30 ~70): (2~
30): (2-30): (20-40). Moreover, according to this example, the thickness of the prepreg (
T) can be produced in various ways depending on the fiber diameter of the organic fibers and foreign fibers used, but it will usually be about 80 to 200 μm.

Next, a case in which the hybrid prepreg of this example is produced using a drum winder will be described in more detail.

First and second carbon fiber reinforced prepregs 4A, 4 used
B has the same configuration, with a thickness of 65 mm on the release paper 10.
It was formed in μm. The carbon fibers 2 as reinforcing fibers were PAN-based carbon fibers (manufactured by Toshi Co., Ltd., trade name: rM40J) with a fiber diameter of 6.5 μm, and the matrix resin was an epoxy resin. Further, the content of matrix resin was 33% by weight.

As the bound fiber 6, a bundle of 300 filaments of polyarylate fiber (pectran) with a fiber diameter of 23 μm is used, and as the dissimilar fiber 8, a bundle of 500 filaments of silicon carbide fiber with a fiber diameter of 15 μm is used,
The organic fibers 6 and the different types of fibers 8 were arranged with an interval of 2 mm.

The hybrid prepreg 1 manufactured in this way is
A hybrid prepreg with a width of 300 mm, a length of 1.7 m, and a thickness (T) of 179 μm was obtained. The blending ratio of carbon fibers, organic fibers, different types of fibers, and matrix resin in the hybrid prepreg of this example is in weight%: carbon fibers: organic fibers: different types of fibers: matrix resin = 46:14:
It was 17:23.

Also, using such hybrid prepreg 1,
A golf club shaft illustrated in FIGS. 1 and 2 was manufactured. The mechanical properties of the golf club shaft were measured, and although the golf club shaft of the present invention is lightweight, it has poor string strength, compressive strength, and elastic modulus.
Even in terms of impact resistance, it was superior to the conventional golf club shaft shown in FIG. 5, had a good feel during use, and had a longer flight distance. Furthermore, when the hybrid prepreg according to the present invention is provided as the outermost layer, reinforcing fibers such as carbon fibers and different types of fibers are arranged without disturbance in the length direction of the fibers, which is aesthetically pleasing. It was something.

Table 4 shows the evaluation results of golf club shafts when various fibers were used as the organic fiber 6 and the foreign fiber 8.

In the above Example 2, carbon fiber 2 was used as the reinforcing fiber in the hybrid prepreg 1.
It is also possible to use different fibers on both sides of the hybrid prepreg 1, as illustrated in the figure.

That is, according to yet another embodiment of the hybrid prepreg 1 according to the present invention, the hybrid prepreg 1 has the same configuration as that of the second embodiment, but the carbon fibers 2 arranged in one direction as reinforcing fibers on the - side. It has glass fibers 3 arranged in the same direction as the carbon fibers 2 on the other side, and is otherwise the same as Example 2. That is,
It has carbon fibers 2 and glass fibers 3 as reinforcing fibers, and further includes boron fibers 6 and boron fibers 6 in the fibers 2.3.
, different types of fibers 8 different from the carbon fibers 2 and glass fibers 3 are arranged in the same direction as the carbon fibers 2 and glass fibers 3.

In this embodiment as well, the structure and arrangement of the boron fibers 6 and the different fibers 8 are the same as in the second embodiment.

That is, in this example, the boron fiber 6 and the different fiber 8
The method of arranging the boron fibers 6 and the different types of fibers 8 is not limited to this, and may be arranged in any manner as desired.

The boron fibers 6 and the different fibers 8 are preferably located at the center of the unidirectional fiber prepreg 4 as shown in FIG. Even if it is placed on the carbon fiber 2 side or the glass fiber 3 side, the same effect can be achieved.

Furthermore, according to this embodiment, the different types of fibers 8 contained in the hybrid prepreg l do not have to be one type, but can be a plurality of types, for example, 2.3 types of different types of different types of fibers. For example, in FIG.
An example having two different types of dissimilar fibers 8a and 8b is shown.

In this way, the different types of fibers 8 include a plurality of types of different types of fibers 8a,
8b, as shown in FIG.
A plurality of different types of fibers 8a, 8b may be arranged between the boron fibers 6, and as shown in FIG. It's okay. The arrangement relationship between the different types of fibers 8 (8a, 8b) and the boron fibers 6 may be arbitrarily selected as desired, as described above.

The hybrid prepreg of this example uses the same carbon fibers, glass fibers, boron fibers, different types of fibers, matrix resin, etc. as in Example 2, and is manufactured by the same method. That is, as shown in FIG. 21, a unidirectional carbon fiber reinforced blob leg 4A using carbon fibers 2 as reinforcing fibers and glass fibers 3 arranged in the same direction as the carbon fibers were used as reinforcing fibers. Boron fibers 6 and different types of fibers 8 are arranged at predetermined intervals in the same direction as the carbon fibers 2 and glass fibers 3 between the unidirectional glass fiber reinforced prepreg 4B, and are integrated by pressing and/or heating. It is manufactured very suitably by this method.

In addition, the blending ratio of carbon fiber, glass fiber, boron fiber, different type of fiber, and matrix resin in the hybrid prepreg of this example can be adjusted arbitrarily, but in general, the ratio by weight of carbon fiber, glass fiber, boron fiber: different type of fiber is : Matrix resin = (15-40): (15-40): (
1-20) = (5-30): (20-50). Further, according to this embodiment, the thickness (T) of the prepreg can be made to be about the same as the fiber diameter of the boron fibers and different fibers used, but it will usually be about 80 to 200 μm.

Next, a case where the upper layer is manufactured using the hybrid prepreg of this example will be described in more detail.

The carbon fiber reinforced prepreg used was 4A, and the release paper was 10A.
It was formed with a thickness of 65 μm on top of the . The carbon fiber 2 as the reinforcing fiber is a PAN-based carbon fiber (manufactured by Toshi Co., Ltd., product name: rM4) with a fiber diameter of 6.5 μm.
0J) was used, and an epoxy resin was used as the matrix resin. Further, the content of matrix resin was 33% by weight.

On the other hand, the glass fiber reinforced prepreg 4B used was formed on the release paper 10B to a thickness of 70 μm. The glass fiber 3 as a reinforcing fiber has a fiber diameter of 13μ.
Using 800 pieces of E glass, which is said to be
Epoxy resin was used as the matrix resin. Further, the content of matrix resin was 33% by weight.

The boron fiber 6 has a fiber diameter of 1001 mm. As the foreign fiber 8, 300 polyarylate fibers (pectran) with a fiber diameter of 23 μm were collected. Using a strand, the boron fiber 6 and the different fiber 8 are 2 mm.
They were arranged so that they were spaced apart from each other.

The hybrid prepreg 1 manufactured in this way is
A hybrid prepreg with a width of 300 mm, a length of 1.7 m, and a thickness (T) of 160 μm was obtained. The blending ratios of carbon fibers, glass fibers, boron fibers, different types of fibers, and matrix resin in the hybrid prepreg of this example are as follows: %, carbon fiber, glass fiber, boron fiber, different types of fiber
Matrix resin = 25:31:2:15:27.

Also, using such hybrid prepreg l,
A golf club shaft illustrated in FIGS. 1 and 2 was manufactured. The mechanical properties of the golf club shaft were measured, and although the golf club shaft according to the present invention is lightweight, it has poor shear tensile strength, compressive strength, and elastic modulus.
4. In terms of impact resistance, it is superior to the conventional golf club shaft shown in Figure 5, and has a good feel when in use.
The flight distance was extended, and the moldability was also excellent.

Furthermore, when the hybrid prepreg according to the present invention is provided as the outermost layer, reinforcing fibers such as carbon fibers and glass fibers and different types of fibers are arranged without disturbance in the length direction of the fibers, resulting in an aesthetically pleasing appearance. It was also favorable.

Table 5 shows that when various fibers are used as the different fiber 8,
The evaluation results of golf club shafts are shown.

In Example 3 above, the hybrid prepreg is
Carbon fiber 2 was used as the reinforcing fiber, but Example 5
It is also possible to use different fibers on both sides of the hybrid prepreg 1, as also illustrated in FIG.

In other words, according to still another embodiment of the hybrid prepreg 1 according to the present invention, the hybrid prepreg 1 has the same configuration as that of the third embodiment, but the carbon fibers 2 arranged in one direction as reinforcing fibers on the - side. It has glass fibers 3 arranged in the same direction as the carbon fibers 2 on the other side, and is otherwise the same as Example 3. That is, it has carbon fibers 2 and glass fibers 3 as reinforcing fibers, and further includes metal fibers 6 and different fibers 8 different from the metal fibers 6, carbon fibers 2, and glass fibers 3 in the fibers 2.3. The carbon fibers 2 and the glass fibers 3 are arranged in the same direction.

In this example as well, the structure and arrangement of the metal fibers 6 and different types of fibers 8 are the same as in Example 3, and the hybrid prepreg of this example uses the same carbon fibers, glass fibers, and metal fibers as in Example 3. , different types of fibers, matrix resin, etc., and manufactured in the same manner as in Example 5 described in connection with FIG. 21.

Furthermore, the blending ratios of carbon fibers, glass fibers, metal fibers, different types of fibers, and matrix resins in the hybrid prepreg of this example can be adjusted arbitrarily, but in general, in terms of weight %,
Carbon fiber/glass fiber: Metal fiber: Different type of fiber: Matrix resin = (15-40): (15-40): (
1-20): (5-30): (20-50). Further, according to this embodiment, the thickness (T) of the prepreg can be made to be about the same as the fiber diameter of the metal fibers and different types of fibers used, but it will usually be about 80 to 200 μm.

Next, a case in which the hybrid prepreg of this example is used will be described in more detail.

The carbon fiber reinforced prepreg used was 4A, and the release paper was 10A.
It was formed with a thickness of 65 μm on top of the . The carbon fiber 2 as the reinforcing fiber is a PAN-based carbon fiber (manufactured by Toshi Co., Ltd., product name: rM4) with a fiber diameter of 6.5 μm.
0J) was used, and an epoxy resin was used as the matrix resin. Further, the content of matrix resin was 33% by weight.

On the other hand, the glass fiber reinforced prepreg 4B used was formed on the release paper 10B to a thickness of 70 μm. The glass fiber 3 as a reinforcing fiber has a fiber diameter of 13μ.
Using 800 pieces of E glass, which is said to be
Epoxy resin was used as the matrix resin. Further, the content of matrix resin was 33% by weight.

As the metal fiber 6, a titanium fiber with a fiber diameter of 100 μm is used, and as the dissimilar fiber 8, a convergence of 300 filaments of polyarylate fiber (pectran) with a fiber diameter of 23 μm is used. is 2mm
They were arranged so that they were spaced apart from each other.

The pipe lid prepreg 1 manufactured in this way is
Width 300mm, length 1.7m, thickness (T) 160μm
A hybrid prepreg was obtained. The blending ratio of carbon fibers, glass fibers, metal fibers, different types of fibers, and matrix resin in the hybrid prepreg of this example is as follows: carbon fibers, glass fibers: metal fibers: different types of fibers: matrix resin = 24:31:3: It was 15:27.

Also, using such hybrid prepreg l,
A golf club shaft illustrated in FIGS. 1 and 2 was manufactured. The mechanical properties of the golf club shaft were measured, and although the golf club shaft of the present invention is lightweight, it has poor tensile strength, compressive strength, and elastic modulus.
It was also superior to the conventional golf club shaft shown in FIG. 5 in terms of stickiness and impact resistance, had a good feel during use, extended flight distance, and was also excellent in moldability. In addition, when the hybrid prepreg according to the present invention is provided as the outermost layer, reinforcing fibers such as carbon fibers and glass fibers and different types of fibers are arranged without disorder (arranged) in the fiber length direction, resulting in an aesthetically pleasing appearance. It was also favorable.

Table 6 shows the evaluation results of golf club shafts when various fibers were used as the metal fibers 6 and the different types of fibers 8.

Husband 1" Tsuji Yu In the above Example 4, the hybrid prepreg is
Carbon fiber 2 was used as the reinforcing fiber, but Example 5
It is also possible to use different fibers on both sides of the hybrid prepreg l, as illustrated in FIG. 17 as well.

In other words, according to yet another embodiment of the hybrid prepreg 1 according to the present invention, the hybrid prepreg 1 has the same configuration as that of embodiment 4, but the carbon fibers 2 arranged in one direction as reinforcing fibers on the - side. It has glass fibers 3 arranged in the same direction as the carbon fibers 2 on the other side, and is otherwise the same as Example 4. That is, it has carbon fibers 2 and glass fibers 3 as reinforcing fibers, and further includes organic fibers 6 and different fibers 8 different from the organic fibers 6, the carbon fibers 2, and the glass fibers 3. , are arranged in the same direction as the carbon fibers 2 and the glass fibers 3.

In this example, the structure and arrangement of the organic fibers 6 and the different fibers 8 are the same as in Example 4, and the hybrid prepreg of this example is made of the same carbon fibers, glass fibers, and organic fibers as in Example 4. , different types of fibers, matrix resin, etc., and manufactured in the same manner as in Example 5 described in connection with FIG. 21.

Further, the blending ratios of carbon fibers, glass fibers, organic fibers, different types of fibers, and matrix resins in the hybrid prepreg of this example can be adjusted arbitrarily, but in general, in weight %,
Carbon fiber; Glass fiber: Organic fiber: Different type of fiber: Matrix resin = (15-40): (15-40): (
1-20): (5-30): (20-50). Further, according to this embodiment, the thickness (T) of the prepreg can be made to be approximately the same as the fiber diameter of the organic fibers and foreign fibers used, but it is usually 80 to 2,001 mm. L
It will probably be about m.

Next, a case where the upper layer is manufactured using the hybrid prepreg of this example will be described in more detail.

The carbon fiber reinforced prepreg used was 4A, and the release paper was 10A.
It was formed with a thickness of 65 μm on top of the . The carbon fiber 2 as the reinforcing fiber is a PAN-based carbon fiber (manufactured by Toshi Co., Ltd., product name: rM4) with a fiber diameter of 6.5 μm.
0J) was used, and an epoxy resin was used as the matrix resin. Further, the content of matrix resin was 33% by weight.

On the other hand, the glass fiber reinforced prepreg 4B used was formed on the release paper 10B to a thickness of 70 μm. The glass fiber 3 as a reinforcing fiber has a fiber diameter of 13μ.
Using 800 pieces of E glass, which is said to be
Epoxy resin was used as the matrix resin. Further, the content of matrix resin was 33% by weight.

As the organic fiber 6, a bundle of 300 filaments of polyarylate fiber (pectran) with a fiber diameter of 23 μm is used, and as the different type of fiber 8, a bundle of 500 filaments of silicon carbide fiber with a fiber diameter of 15 μm is used,
The organic fibers 6 and the different types of fibers 8 were arranged with an interval of 2 mm.

The hybrid prepreg 1 manufactured in this way is
A hybrid prepreg with a width of 300 mm, a length of 1.7 m, and a thickness (T) of 179 μm was obtained. The blending ratios of carbon fibers, glass fibers, organic fibers, different types of fibers, and matrix resin in the hybrid prepreg of this example are as follows: %
The ratio of carbon fiber, glass fiber: organic fiber: different type of fiber: matrix resin was 21:27:13:16:23. Also, using such hybrid prepreg 1, golf club shafts shown in FIGS. 1 and 2 were manufactured. The mechanical properties of the golf club shaft were measured, and although the golf club shaft according to the present invention is lightweight, it has a tensile strength, compressive strength, elastic modulus, and impact resistance as shown in Fig. 5. It was superior to the conventional golf club shaft shown in Table 1, had a good feel during use, extended flight distance, and was also excellent in moldability. or,
When the hybrid prepreg according to the present invention is provided as the outermost layer, reinforcing fibers such as carbon fiber and glass fiber,
The different types of fibers were arranged without disturbance in the length direction of the fibers, which was aesthetically pleasing.

Table 7 shows the evaluation results of golf club shafts when various fibers were used as organic fiber 6 and foreign fiber 8.

The golf club shaft according to the present invention configured as described above can improve mechanical properties such as tensile strength, compressive strength, elastic modulus, and even stickiness. ,
It is possible to prevent breakage and increase flight distance, and is also excellent in terms of feel during use, moldability, and aesthetics.

[Brief explanation of drawings]

1 and 2 are cross-sectional views of a golf club shaft according to the present invention. FIG. 3 is a diagram illustrating a method of manufacturing a golf club shaft. FIG. 4 is a plan view showing a prepreg for manufacturing a golf club shaft. FIG. 5 is a cross-sectional view of a conventional golf club shaft. 6 and 7 are cross-sectional views of an embodiment of a hybrid prepreg for manufacturing a golf club shaft according to the present invention. FIG. 8 is a diagram for explaining one embodiment of a method for manufacturing a hybrid prepreg. FIG. 9 is a diagram for explaining the converted diameter when the fiber diameter is small. FIG. 10 is a cross-sectional view of a hybrid blib when using fibers with a small fiber diameter. 11 to 15 are cross-sectional views of other embodiments of a hybrid prepreg for manufacturing a golf club shaft according to the present invention. FIG. 16 is a diagram for explaining one embodiment of the method for manufacturing the hybrid prepreg shown in FIGS. 11 to 15. 17 to 20 are cross-sectional views of still other embodiments of the hybrid prepreg for manufacturing the golf club shaft according to the present invention. FIG. 21 is a diagram for explaining an embodiment of the method for manufacturing the hybrid prepreg shown in FIGS. 17 to 20. 1゛: Hybrid prepreg layer) 01°: Angle layer 102' Nistrade layer 1: Hybrid prepreg 2: Carbon fiber 3 Niglass fiber 8 Different types of fibers Figure 2 Figure 1 Figure 00 01 Figure 5 Figure 6 Figure 7 Figure 8 0 Figure 11 Figure 12/1 Figure 13 Figure 14 Figure 1 Figure 16 0 Figure 17 Figure 18 Figure 19

Claims (1)

[Scope of Claims] 1) A golf club shaft composed of a plurality of carbon fiber reinforced resin layers, in which the carbon fiber reinforced resin layers and/or
Or, a golf club shaft characterized in that the outermost layer is provided with a hybrid prepreg layer in which fibers of a different type than the reinforcing fibers are arranged at predetermined intervals in the same direction as the reinforcing fibers. 2) The hybrid prepreg layer has a fiber diameter of 5 to 3
Among the reinforcing fibers that are assumed to be 0 μm, there are fibers with a diameter of 50 to 500 μm.
2. The golf club shaft according to claim 1, which is constructed by arranging different types of fibers each having a diameter of .mu.m at a predetermined interval in the same direction as the reinforcing fibers. 3) The hybrid prepreg layer includes reinforcing fibers arranged in one direction, and boron fibers and one or more types of different fibers different from the boron fibers and the reinforcing fibers, arranged in the same direction as the reinforcing fibers. The golf club shaft according to claim 1, which is constructed as follows. 4) The hybrid prepreg layer has metal fibers and one or more types of different fibers different from the metal fibers and reinforcing fibers arranged in the same direction as the reinforcing fibers. The golf club shaft according to claim 1, which is constructed as follows. 5) The hybrid prepreg layer includes reinforcing fibers arranged in one direction, organic fibers, and different fibers such as glass fibers and/or inorganic fibers different from the reinforcing fibers.
Claim 1: The reinforcing fibers are arranged in the same direction.
Golf club shaft as described. 6) The golf club shaft according to any one of claims 3 to 5, wherein the reinforcing fibers of the hybrid prepreg layer are carbon fibers. 7) The golf ball according to any one of claims 3 to 5, wherein the reinforcing fibers of the hybrid prepreg layer include carbon fibers arranged on one side of the hybrid prepreg layer and glass fibers arranged on the other side. club shaft.