JPH08117368A - Golf club head - Google Patents

Abstract

PURPOSE: To keep a vibration absorbing ability to improve an impact feeling as well as a flight distance by forming a club head body other than sole part using polyparaphenylenebenzobisoxazole fiber impregnated with resin when producing a golf club head made from a fiber reinforced resin material. CONSTITUTION: The wood club head of golf other than a sole plate 2 of the sole is formed such that polyparaphenylenebenzobisoxazole fibers 6 (PBO fiber) impregnated with a resin 6 are laminated to in a specific thickness. As the PBO fiber 6, a monofilament bundle arranged in one direction, woven or knit fabric or fibers cut in a certain length which is impregnated with a resin is used, and as the resin to be impregnated into fibers, a thermoplastic resin or a thermosetting resin is used. The wood club head 1 other than a sole part can also be formed such that PBO fiber layers 6 impregnated with the resin and carbon fiber reinforced resin layers are laminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club head made of a fiber reinforced resin material, more specifically,
The present invention relates to a golf club head in which the material of the iron golf club head and the wood golf club head is composed mainly of resin-impregnated polyparaphenylene benzobisoxazole fiber.

[0002]

2. Description of the Related Art Conventionally, wood golf club heads have been made of materials such as persimmon, stainless alloy, soft iron, titanium, aluminum and their alloys, as well as carbon fiber and aromatic polyamide fiber. It is made of a fiber-reinforced resin material impregnated with resin.

Further, the material constituting the iron golf club head is made of a fiber reinforced resin material in addition to the metal material. Generally, when designing a wood golf club head or an iron golf club head, the selection of the material forming the club head main body requires a storage elastic modulus for flying a ball, which is a required function.
The ball is hard to bend, and the specific gravity as an element necessary for increasing the volume and distributing around the weight for designing the head,
In addition to density, vibration absorption, loss elastic modulus required to optimize hitting sound, and the like are included.

[0004]

The materials conventionally used have advantages and disadvantages for each of the above functions.
For example, when a wood golf club head is made of a metal material, it has a large specific distance, is easy to distribute around the weight, and is excellent in bending, but has a large specific gravity, which makes it difficult to increase the volume (large head). However, there is a problem that a stable hit ball cannot be obtained. Therefore, in recent years, although a lightweight metal such as titanium or aluminum alloy is used to increase the volume, there is a problem that the manufacturing method is difficult and the cost is high.

On the other hand, resin wood golf club heads in which carbon fibers are impregnated with resin are also frequently used. Needless to say, carbon fiber reinforced resin is a material that is indispensable for improving flight distance and directionality because it is much lighter in weight and has a higher elastic modulus than metal materials. However, the carbon fiber itself is a brittle material, and the composite material using the carbon fiber has a drawback that it is brittle and inferior in toughness. Moreover, although it excels in vibration absorption compared to metals, it is overwhelmed by the search for materials with higher performance.

[0006] Therefore, in recent years, it has been widely used,
It is an aromatic polyamide fiber represented by Kevlar (called aramid fiber). Aramid fiber is used as an auxiliary material of carbon fiber for partial reinforcement of the club head body (for example, head neck portion) and face insert. This aramid fiber has excellent vibration absorption characteristic of organic fiber, is lightweight and has excellent strength, while having a tensile elastic modulus of 390 to 1500 g / d (or 50 to 190 G).
Units widely used carbon fiber material in Pa) degree 24t / mm ² ~60t / mm ² things modulus to 5-19
Since there is only a level of t / mm ² , there is a deadly wound that the ability to repel the ball is low. In addition to these, there are also high-strength and high-elasticity fibers such as polyarylate (trade name: Vectran, Econol), but their elastic modulus has not reached the high resilience of the ball.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of such conventional problems, and improves the toughness of the material forming the club head main body and maintains the vibration absorption to improve the feel at impact. Another object of the present invention is to provide a golf club head capable of improving the ball repulsion and the flight distance due to the high elasticity effect.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is characterized in that the entire club head main body except the sole portion is made of resin-impregnated polyparaphenylenebenzobisoxazole fiber. It is a thing. As the polyparaphenylene benzobisoxazole fiber, a monofilament aligned in one direction, a knitted fabric or a short fiber impregnated with a resin is used, and the resin impregnated into the fiber is a thermoplastic resin or a thermosetting resin. is there.

Further, according to the present invention, the entire club head body except the sole portion is formed by laminating a resin-impregnated polyparaphenylenebenzobisoxazole fiber layer and a carbon fiber reinforced resin layer. To do. Further, the gist of the present invention is that the material of the face insert of the club head main body excluding the sole portion is composed of resin-impregnated polyparaphenylenebenzobisoxazole fiber.

Further, the gist of the present invention is that the neck portion of the club head body, excluding the sole portion, is reinforced with a resin-impregnated polyparaphenylenebenzobisoxazole fiber.

[0011]

The present invention is constructed as described above, and polyparaphenylene benzbisoxazole (hereinafter referred to as PBO) is used as the fiber material constituting the club head body.
Use fiber. In general formula

[0012]

Embedded image The monomer repeating unit represented by
I have more than one. As mentioned above, there are some which have a trans or cis structure, but either one may be used. Thus, by using polyparaphenylenebenzobisoxazole fiber as the main fiber material constituting the club head body, a golf club head having an elastic modulus similar to that of carbon fiber can be obtained. Since it has excellent characteristics and has a large elongation, it can solve the problem of strength, which is a defect of carbon fiber, and further, due to the viscous characteristics peculiar to organic fiber, it has a large vibration absorbing property at the time of hitting, and the hit feeling is improved.

The polyparaphenylene benzobisoxazole fiber can be used not only as a head body but also as a material for a face insert of a club head body and a reinforcing material for a neck portion of the club head body. Further, as the polyparaphenylene benzobisoxazole fiber, it is also possible to use a bundle of monofilaments aligned in one direction, a weave, or one cut to a predetermined length and impregnated with a resin.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an overall perspective view of a wood golf club head embodying the present invention, FIG. 2 is a partially cutaway perspective view of the wood golf club head, 1 is a club head body made of a fiber reinforced resin material, and 2 is a sole. A plate 3 is a face insert mounted on the face portion 4 of the club head body, and 5 is a neck portion of a connecting portion between the club head body 1 and the shaft 9.

In the embodiment of the present invention, as shown in FIG. 2, the entire club head body excluding the sole plate 2 of the sole portion is resin-impregnated with polyparaphenylene benzobisoxazole fiber 6 (hereinafter referred to as PBO fiber). ) Are laminated to have a constant thickness. The polyparaphenylene benzobisoxazole fiber 6 impregnated with the resin has the general formula as described above.

[0016]

Embedded image The monomer repeating unit represented by
Some of the above have a trans and cis structure as described above, but either may be used. This PBO fiber 6
Has a modulus of elasticity similar to that of carbon fiber, is excellent in resilience characteristics of the ball, has a large elongation, and further has a large vibration absorbing property at the time of hitting due to the viscous characteristics inherent to the organic fiber, thereby improving the hit feeling.

The thickness of the layer of the PBO fiber 6 is 0.
About 0.1 mm to 0.3 mm is preferable, and if it is 0.01 mm or less, interlayer adhesion is insufficient, and if it is 0.3 mm or more, the high elastic property of the fiber itself is impaired. The matrix resin with which the PBO fiber 6 is impregnated may be, for example, a thermosetting resin such as epoxy, vinyl ester or unsaturated polyester, or a thermoplastic resin such as nylon or polyimide.
The resin is impregnated with 40% with respect to 0%, but the impregnated amount of the resin can be arbitrarily selected.

Furthermore, the elasticity and toughness of the resin itself can be improved by mixing a silicon carbide type whisker or the like. The filament of the PBO fiber 6 is formed by liquid crystal spinning after polymerizing diaminoresorcinol and terephthalic acid in polyphosphoric acid, and has a diameter of 1 to 1.
30 μm, preferably 10 to 20 μm.

As the polyparaphenylene benzobisoxazole fiber 6, it is also possible to use monofilaments aligned in one direction or knitted or short fibers randomly oriented and impregnated with resin. Further, the club head body 1 is constructed by laminating a polyparaphenylene benzobisoxazole fiber layer impregnated with a resin and a carbon fiber reinforced resin layer in addition to the PBO fiber 6 as a whole as described above. Is also good.

Further, the club head body 1 excluding the sole portion
As shown in FIG. 3, the material of the face insert 3 of
It is also possible to stack the polyparaphenylene benzobisoxazole fibers 6 impregnated with a resin,
It is also possible to reinforce the neck portion 5 of the club head body 1 with polyparaphenylenebenzobisoxazole fiber impregnated with resin.

FIG. 4 shows another embodiment in which the club head body 7 of the resinous iron golf club is composed of polyparaphenylene benzobisoxazole fiber 6.
The head body 7 excluding the sole plate 8 of the sole portion is formed to have a constant thickness by laminating the resin-impregnated polyparaphenylenebenzobisoxazole fiber 6 in the same manner as described above.

A method of manufacturing a club head body using the polyparaphenylene benzobisoxazole fiber 6 as described above will be briefly described. A PBO fiber reinforced resin layer is formed in a predetermined shape in advance, for example, in a wood club head. If there is a core material, wrap it around. If it is an iron club head, combine it with a core material, a metal frame, etc. to perform pre-molding.

Next, the preform in the mold is placed in an oven or the like and pressurized and heated. In the case of a thermosetting resin, it is cured at a predetermined temperature and time. The club head body 1 can be easily molded by such a method, and in the case of the face insert 3, several reinforcing resin layers are laminated in advance and pressure molding is performed. Also, P
When the BO fiber 6 is used as a reinforcing layer, the PBO fiber is arranged in the neck portion 5 of the conventional resin head of the preform,
It can be integrally molded by putting it in a mold and applying pressure and heat in an oven.

Next, the entire structure according to the embodiment of the present invention will be described below.
Golf club heads using BO fibers 6, golf club heads using conventional aromatic polyamide fibers (aramid fibers), golf club heads using carbon fibers and polyarylate-based products (trade name Vectran, Econol), etc. Table 1 below shows a comparative example with a golf club head using high strength and high elasticity fiber.

[0025]

[Table 1] As is clear from Table 1, in the case of the golf club head using the PBO fiber 6 as a whole, the tensile elastic modulus, the bending strength index,
It can be seen that the flexural modulus index, impact strength index, and vibration damping index are excellent.

As a result of trial hitting the golf club head, it is found that the flight distance index and shot feeling are excellent. Also, by using PBO fiber reinforced resin for the club head, the ball has a high elastic modulus, so the ball repulsion force is large and the flight distance is improved. Furthermore, the vibration damping characteristic of the organic fiber provides a good shot feeling. It can be seen that Therefore, it can also be used for tennis rackets. In this case, the impact is hard to be transmitted, so that it is effective in preventing elbow pain, and the ball has a large impact resilience, so that the ball can be repelled well.

[0027]

As described above, according to the present invention, the entire club head body except the sole portion is made of resin-impregnated polyparaphenylenebenzobisoxazole fiber, so that the toughness of the material forming the club head body is improved. It has the effect of improving the shot feeling by maintaining the vibration absorption property while improving the ball resilience and the flight distance by the high elasticity effect.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a wood golf club head embodying the present invention.

FIG. 2 is a partially cutaway perspective view of a wood golf club head.

FIG. 3 is a perspective view of a face insert.

FIG. 4 is a partially cutaway perspective view of the present invention applied to an iron golf club head.

[Explanation of reference numerals] 1 club head body 2 sole plate 3 face insert 4 face part 5 neck part 6 polyparaphenylene benzobisoxazole fiber

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location C08J 5/04 // C08L 65/00 LNY

Claims (8)

[Claims] 1. A golf club head made of a fiber reinforced resin material, wherein the entire club head body except the sole portion is made of resin-impregnated polyparaphenylenebenzobisoxazole fiber. 2. The polyparaphenylene benzobisoxazole fiber is used as a bundle of monofilaments aligned in one direction, a weave, or one cut into a predetermined length and impregnated with a resin. Golf club head. 3. The golf club head according to claim 1, wherein the resin with which the fibers are impregnated is a thermoplastic resin or a thermosetting resin. 4. A golf club head made of a fiber reinforced resin material, wherein the entire club head body except the sole portion is laminated with a resin-impregnated polyparaphenylenebenzobisoxazole fiber layer and a carbon fiber reinforced resin layer. A golf club head characterized by being configured as follows. 5. A golf club head made of a fiber reinforced resin material, characterized in that the material of the face insert of the club head body excluding the sole portion is made of resin-impregnated polyparaphenylene benzobisoxazole fiber. Golf club head. 6. The golf club head according to claim 5, wherein the polyparaphenylene benzobisoxazole fiber is a monofilament aligned in one direction or a knitted fabric or a short fiber impregnated with a resin. 7. A golf club head made of a fiber reinforced resin material, wherein the neck portion of the club head body except the sole portion is reinforced with a resin-impregnated polyparaphenylene benzobisoxazole fiber. head. 8. The golf club head according to claim 7, wherein the polyparaphenylene benzobisoxazole fiber is a monofilament aligned in one direction or a knitted fabric or a short fiber impregnated with a resin.