JP2015150007A - Fiber-reinforced resin golf club shaft and manufacturing method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fiber-reinforced resin golf club shaft that is superior in design properties without impairing the basic performance of the golf club shaft, and to provide a manufacturing method of the fiber-reinforced resin golf club shaft.SOLUTION: A fiber-reinforced resin golf club shaft is made of multiple fiber reinforced resin layers. The fiber-reinforced resin golf club shaft is characterized by: having a biasing layer in which a reinforcing fiber of a fiber reinforced resin layer oriented in a direction of ±30° to ±60° to a shaft axial direction, and a straight layer in which the reinforcing fiber of the fiber reinforced resin layer is oriented substantially in the shaft axial direction; having a fabric-like fiber reinforced resin layer in which a weight per unit area of the reinforcing fiber is 80 g/mto 120 g/mon an outer layer, and deposited with metal on the surface of the reinforcing fiber; and further having a glass fiber reinforced resin layer with a thickness of 50 μm to 100 μm on the outer layer.

Description

  The present invention relates to a fiber reinforced resin golf club shaft and a method of manufacturing the same.

  The golf club shaft is the most important performance required to increase the flight distance and stabilize the directionality in the game of golf. In recent years, the importance of the design has also increased. In the background, conventional golf clubs have been manufactured and sold as a golf club head, shaft, and grip as one body, but since each of them has been selected as one's preference and assembled as a golf club, “custom-made” has progressed, It is mentioned that the tendency to request differentiation in the appearance of golf clubs has increased.

  The most widely used technique for improving the design of a golf club shaft is to differentiate it by painting. Conventionally, it was painted in a single color such as black, but in order to improve the design, it is differentiated from other shafts by applying two or more colors using gradation, etc., and also by applying multicolor printing. In recent years, shafts have become mainstream.

  However, such differentiation by painting, it is necessary to paint several layers to give a change in color, the process becomes longer, the weight of the shaft by painting, the outer diameter becomes thicker, etc. The problem is that it has a considerable influence on the performance of the shaft.

  On the other hand, in patent document 1 (Unexamined-Japanese-Patent No. 2002-191735), it has a low elastic fiber resin layer which arrange | positions a metal wire layer in the surface layer of the golf shaft which consists of a fiber reinforced resin layer, and can see through on it. A method for manufacturing a golf club shaft is disclosed.

  According to Patent Document 1, it is possible to manufacture a golf shaft that has a three-dimensional depth and is excellent in design. Certainly, according to this method, it is possible to produce a golf shaft that has a three-dimensional depth and is excellent in design, so there is no need for complicated coating, and it is possible to prevent an increase in weight due to coating, but fiber reinforced Since the specific gravity of the metal wire layer is larger than that of the resin layer, the weight increases due to the addition of the metal wire layer, and depending on the type of the metal wire, the metal wire itself is too rigid and difficult to wind. Have.

  Separately from the above, a prepreg made of a woven fiber reinforced resin is arranged on the surface layer of a golf shaft made of a fiber reinforced resin layer, and a prepreg made of a low elastic fiber resin that can be seen through is arranged on the surface of the golf shaft. A golf shaft with excellent properties can be manufactured.

  However, a prepreg made of such a woven fiber reinforced resin has a problem that the prepreg is inferior in drapability because warps and wefts are largely bent. Therefore, when a prepreg made of a woven fiber reinforced resin is wrapped around a tubular body having a small outer diameter such as a golf shaft, it is difficult to wind the prepreg made of the woven fiber reinforced resin. The position, direction, and length of the prepreg to be wound are limited, and there is a problem that it is insufficient for reinforcing the golf shaft.

  In order to solve this problem, in Patent Document 2 (JP-A-8-336903) and Patent Document 3 (JP-A-8-336904), the yarn width is 3 to 16 mm and the yarn width / thickness ratio is 20 or more. It discloses that a lightweight and high-strength sports / leisure article and tubular body can be obtained by using a woven fabric made of flat reinforcing fiber yarns.

  However, since these woven reinforcing fibers have high drapability, they are easy to wind around the tubular body, but the texture is easily shifted, and when used in the outermost layer, the texture is scraped by polishing. There is a problem that it is difficult to use as a design application.

  In order to solve this problem, in Patent Document 4 (Japanese Patent Laid-Open No. 2010-207367), a fiber-reinforced fiber layer having a fiber bundle width of 2 mm to 20 mm is wound, and a glass fiber reinforced resin of 50 μm to 100 μm is wound. A method of manufacturing a fiber reinforced resin golf club shaft on which a layer is wound is disclosed.

  Certainly, the fiber reinforced resin golf club shaft produced by this process can produce a golf club shaft with excellent design, but the woven fabric fibers used here have sufficient color development. Since there was no effect, it was not possible to produce a golf club shaft having a high-luminance design.

JP 2002-191735 A JP-A-8-336903 JP-A-8-336904 JP 2010-207367 A

  The present invention has been made in view of the above circumstances, and is made of a fiber reinforced resin for producing a golf club shaft having a metallic luster excellent in design without impairing the basic performance of the golf club shaft. It is an object of the present invention to provide a golf club shaft and a manufacturing method thereof.

  In order to achieve the above object, the present invention employs the following configuration.

(1) A shaft for a fiber reinforced resin golf club composed of a plurality of fiber reinforced resin layers, wherein the reinforcing fibers of the fiber reinforced resin layer are oriented in a direction of ± 30 ° to ± 60 ° with respect to the shaft axial direction. The bias layer and the reinforcing fiber of the fiber reinforced resin layer have a straight layer substantially oriented in the shaft axis direction, and the weight per unit area of the reinforcing fiber is 80 g / m ^{2 to} 120 g / in the outer layer. m ² , characterized in that it has a woven fiber reinforced resin layer in which metal is deposited on the surface of the reinforcing fiber, and further has a glass fiber reinforced resin layer having a thickness of 50 μm to 100 μm on its outer layer. Fiber reinforced plastic golf club shaft.

  (2) A fiber bundle of reinforcing fibers forming the woven fabric-like fiber reinforced resin layer is 2,000 to 18,000 filaments, and a width of the fiber bundle is 2 mm to 25 mm. A shaft for golf club made of fiber reinforced resin as described in 1).

  (3) The fiber reinforced resin golf club shaft according to (1) or (2), wherein the woven fabric forming the woven fabric fiber reinforced resin layer is a plain weave.

  (4) The above-mentioned (1) to (3), wherein the woven fabric-like fiber reinforced resin layer is attached to a straight layer oriented in the axial direction of the shaft while being substantially half-shifted, integrated and wound. The manufacturing method of the shaft for golf clubs made from the fiber reinforced resin in any one.

(5) A method for producing a fiber reinforced resin golf club shaft comprising a plurality of fiber reinforced resin layers, wherein the reinforcing fibers of the fiber reinforced resin layer are within a range of ± 30 ° to ± 60 ° with respect to the shaft axial direction. A step of winding the bias layer oriented in the direction, a step of winding the straight layer substantially oriented in the axial direction of the shaft of the reinforcing fiber of the fiber reinforced resin layer, and a weight per unit area of the reinforcing fiber of 80 g / Metal is vapor-deposited on the surface of the reinforcing fiber, which is m ^{2 to} 120 g / m ² , the reinforcing fiber bundle is 2,000 to 18,000 filaments, and the reinforcing fiber bundle width is 2 mm to 25 mm. A step of winding the woven fabric-like fiber reinforced resin layer, and a step of winding a glass fiber reinforced resin layer having a thickness of 50 μm to 100 μm after being wound. A method for manufacturing a golf club shaft made of fiber reinforced resin.

  According to the method for manufacturing a fiber reinforced resin golf club shaft of the present invention, the woven fiber reinforced resin layer having a metal deposited on the surface has a high-luminance design, so that it is excellent without complicated coating. A fiber reinforced resin golf club shaft for producing a golf club shaft excellent in design without impairing the basic performance of the golf club shaft, and a method for producing the same. I can do it.

  Hereinafter, with reference to the drawings, the configuration and operational effects of the present invention will be specifically described with preferred embodiments.

It is explanatory drawing which shows the cutting shape of the prepreg which shows one Embodiment of the shaft for golf clubs of this invention, and winding order. It is a schematic explanatory drawing of a mandrel. FIG. 3 is an explanatory diagram showing a cutting shape of a prepreg used for manufacturing a golf shaft in Example 1 and a winding order around a mandrel 10. FIG. 5 is an explanatory diagram showing a cutting shape of a prepreg used for manufacturing a golf shaft in Example 2 and a winding order around a mandrel 10. 5 is an explanatory diagram showing a cutting shape of a prepreg used for manufacturing a golf shaft in Comparative Example 1 and a winding order around a mandrel 10. FIG. FIG. 6 is an explanatory diagram showing a cutting shape of a prepreg used for manufacturing a golf shaft in Comparative Example 2 and a winding order around a mandrel 10.

The golf club shaft manufacturing method of the present invention comprises a golf club shaft comprising a plurality of fiber-reinforced resin layers after a prepreg having a cut shape as shown in FIG. Manufacturing. That is, as shown in the pattern 1 in FIG. 1, the reinforcing layer of the fiber reinforced resin layer is wound around the mandrel 10 with a bias layer made of a prepreg 21 oriented in a direction of ± 30 ° to ± 60 ° with respect to the shaft axis direction. A first step, a second step in which the reinforcing layers of the fiber reinforced resin layer are wound on the required layers of the straight layers shown in the patterns 2 to 6 made of the prepregs 22 to 26 substantially aligned in the shaft axis direction, and the reinforcing fibers weight per unit area is ^{80g / m 2 ~120g / m 2} , a third step of winding a plurality of layers of prepreg 27 shown in pattern 7 made of the metal on the surface of the reinforcing fibers are deposited fabric-like fiber-reinforced resin And a fourth step of sequentially winding the prepreg 29 shown in the pattern 9 composed of the glass fiber reinforced resin layer so that the thickness becomes 50 μm to 100 μm. There.

  According to the illustrated example, the number of straight layers wound in the second step is five. However, the number of layers is arbitrary and can be appropriately determined according to the required performance as a golf club. In the present embodiment, the reinforcing piece made of the prepreg 28 made of the straight layer is wound around the head side end portion of the shaft between the third step and the fourth step, but this step can be omitted, or A plurality of layers may be interposed between the first to fourth steps.

  As the matrix resin constituting the prepreg used in the method for manufacturing a golf club shaft of the present invention, a thermoplastic resin or a thermosetting resin can be used, but a thermosetting resin is preferably used.

  As the thermoplastic resin, polyamide resins, polyacrylate resins, polystyrene resins, polyethylene resins, and mixed resins thereof can be used. On the other hand, as thermosetting resins, epoxy resins, unsaturated polyester resins, phenol resins, urea resins, melamine resins, diallyl phthalate resins, urethane resins, polyimide resins, and mixed resins thereof are used. Can be used. Among these, epoxy resins are most preferably used because they have a low cure shrinkage and high rigidity and toughness.

  The fibers constituting the fiber reinforced resin layer used in the method for manufacturing a golf club shaft of the present invention include inorganic fibers such as metal fibers, boron fibers, carbon fibers, glass fibers, and ceramic fibers, aramid fibers, and other high fibers. A strong synthetic fiber or the like can be used. Inorganic fibers are preferably used because of their light weight and high strength. Among these, carbon fiber is optimal because it is excellent in specific strength and specific rigidity. These fibers can be used alone or in combination. Further, the lengths of the fibers such as long fibers, short fibers, and mixed fibers thereof are not particularly specified.

  Usually, in a method for producing a golf club shaft composed of a fiber reinforced resin layer, the length is adjusted by cutting the small diameter end and the large diameter end after heat curing. The distance Lb shown in FIG. 1 is set so that the length becomes the target length after this cutting. For example, when a golf club shaft having a total length of 1170 mm is to be obtained, Lb is set to 1190 mm when a small-diameter end is cut by 10 mm and a large-diameter end is cut by 10 mm.

  The material of the mandrel 10 is not particularly limited as long as it is made of metal, but is preferably made of iron from the viewpoint of easy processing such as taper and excellent durability. The prepregs 21 to 29 shown in FIG. 1 are wound around the mandrel 10. When the fiber reinforced resin layer is removed from the mandrel 10 after heat curing, a release agent is applied to the mandrel 10 in advance so as to facilitate demolding. It is preferable to keep it.

  In the golf club shaft manufacturing method of the present invention, first, a bias layer comprising a prepreg 21 in which reinforcing fibers of a fiber reinforced resin layer are oriented in a direction of ± 30 ° to ± 60 ° with respect to the shaft axial direction is provided on the mandrel 10. Wrap around. The reinforcing fiber used for the prepreg 21 is optimal because the carbon fiber is excellent in specific strength and specific rigidity.

  In order to partially strengthen the strength of the golf club shaft and improve the rigidity, a reinforcing layer having a shape as shown in pattern 2 in FIG. 1 can be wound at the beginning, middle, or end of these steps. There may be sheets. The reinforcing fiber used for the reinforcing piece made of the prepreg 22 shown in the pattern 2 is optimal because the carbon fiber is excellent in specific strength and specific rigidity.

  Next, the reinforcing fiber of the fiber reinforced resin layer is wound with a straight layer made of prepregs 23 to 26 oriented substantially in the shaft axial direction. The reinforcing fibers used for the prepregs 23 to 26 are optimal because carbon fibers are excellent in specific strength and specific rigidity.

Next, a prepreg 27 made of a woven fiber-reinforced resin is wound. Although no particular limitation on the weight per unit area of the woven-like reinforcing fiber used in the prepreg ^{27, 80g / m 2 ~120g /} m 2 is preferred. If it is larger than 120 g / m ^2, the reinforcing fiber forming the woven fabric will bend flexibly, and the drapability of the prepreg will be impaired. On the other hand, if it is less than 80 g / m ² , the gap of the woven fabric becomes large, and the smoothness and design of the surface are impaired.

  It should be noted that a metal needs to be deposited on the surface of the woven fiber. By vapor-depositing on these woven fabric fibers having excellent surface smoothness, the design of the obtained golf club shaft becomes more excellent. Although there is no restriction | limiting in particular in the kind of metal used for vapor deposition, It is preferable in terms of the ease of vapor deposition and glossiness to use gold | metal | money, silver, copper, platinum, aluminum, chromium, etc. or those alloy systems.

  Further, when the prepreg 27 made of a woven fabric-like fiber reinforced resin is attached to the prepreg 26 made of a straight layer while being shifted substantially by half a circumference, it is difficult to cause misalignment of the woven fabric of the prepreg 27, and the design property It is more preferable because a golf club shaft excellent in the above can be obtained. It should be noted that when the outer periphery of the small-diameter end of the shaft is 20 mm and the outer periphery of the large-diameter end is 40 mm, the prepreg 27 is shifted from the prepreg 26 with respect to the small-diameter end of the shaft. Means 10 mm and the large-diameter end portion side is shifted by 20 mm.

  Although there is no restriction | limiting in particular in the fiber bundle of the woven fabric reinforcement fiber used for the prepreg 27, It is preferable that it is 2,000-18,000 filaments. If it is less than 2,000 filaments, the woven fabric structure becomes too small, and if it is more than 18,000 filaments, the woven fabric structure becomes too large and the design is impaired. The appearance of the golf club is preferably 3,000 to 15,000 filaments, more preferably 3,000 to 12,000.

  The width of the fiber bundle forming the woven fabric used for the prepreg 27 is preferably 2 mm to 25 mm. If it is smaller than 2 mm, the voids of the woven fabric become too large and the surface smoothness and design properties are impaired, and if it is larger than 25 mm, the lattice pattern becomes too large and the design properties are inferior. The appearance of the golf club is preferably 2 mm to 20 mm, and more preferably 2 mm to 18 mm.

  As the woven fabric-like reinforcing fibers used for the prepreg 27, inorganic fibers such as metal fibers, boron fibers, carbon fibers, glass fibers, and ceramic fibers, aramid fibers, and other high-strength synthetic fibers can be used. Inorganic fibers are preferably used because of their light weight and high strength. Among these, carbon fiber is optimal because it is excellent in specific strength and specific rigidity.

  The elastic modulus of the woven reinforcing fiber used for the prepreg 27 is not particularly limited, but is preferably a carbon fiber of 230 GPa or more. This is because if it is less than 230 GPa, sufficient rigidity as a golf shaft cannot be obtained, reinforcement is required, and problems such as an increase in weight occur. If the elastic modulus of the reinforcing fiber is larger than 400 GPa, the tensile strength of the fiber is lowered, and the woven fabric itself is too rigid, so that the draping property of the prepreg is impaired. It is preferable to set it as 400 GPa.

  The form of the woven fabric used for the prepreg 27 may be any form such as plain weave, satin weave, twill weave, etc., but plain weave is particularly preferable because the form of the woven fabric is easily maintained.

  The warp and weft of the woven fabric used for the prepreg 27 may be oriented substantially in the shaft axial direction, or may be oriented ± 40 ° to ± 50 ° with respect to the shaft axial direction. If the warp is oriented in the shaft axis direction, the bending and crushing rigidity of the shaft can be improved. If the warp is oriented at ± 40 ° to ± 50 ° with respect to the shaft axis direction, the torsional rigidity of the shaft is improved. be able to.

  In order to adjust the outer diameter of the small-diameter end of the golf shaft, a reinforcing layer having a shape as shown in the pattern 8 of FIG. 1 may be wound at the beginning, midway, or last of these steps. There may be. The reinforcing fiber used for the reinforcing piece made of the prepreg 28 is not limited, but carbon fiber is optimal because it is excellent in specific strength and specific rigidity.

  Finally, a prepreg 29 made of glass fiber reinforced resin is wound. The form of the glass fiber used for the prepreg 29 may be any of a woven fabric, a non-woven fabric, and a state aligned in one direction. As the matrix resin, a thermoplastic resin or a thermosetting resin can be used, but a thermosetting resin is preferably used, and an epoxy resin is particularly preferable because of high characteristics such as adhesive strength and heat resistance. In addition, since it is necessary to visualize the woven fabric form of the prepreg 27 in the base, it is more preferable that the epoxy resin is highly transparent.

  Although there is no restriction | limiting about the thickness of the prepreg 29, The thickness of the glass fiber reinforced resin layer after winding needs to be 50 micrometers-100 micrometers. The shaft of a fiber reinforced resin golf club is polished to remove surface irregularities and adjust flex after thermoforming. Therefore, if the thickness of the glass fiber reinforced resin layer after winding is smaller than 50 μm, the woven fabric reinforcing fiber layer is also polished together with the glass fiber reinforced resin layer at the time of polishing, or unevenness of the woven fabric reinforcing fiber layer remains. There is a problem that the surface smoothness is impaired. In addition, if the thickness of the glass fiber reinforced resin layer after winding is larger than 100 μm, the woven reinforced fiber becomes difficult to see in the appearance, or the specific gravity of the glass fiber is heavy, so that the weight of the golf club shaft becomes heavy. This is not preferable because of problems such as When the glass fiber reinforced resin layer is wound to have a thickness of 50 μm to 100 μm, these problems are solved, and a golf club shaft having excellent surface smoothness and excellent design can be obtained.

  According to the golf club shaft according to the embodiment of the present invention described above, since the woven fiber-reinforced resin layer has a high-luminance design, it has an excellent design without complicated coating. Thus, a golf club shaft excellent in design and a manufacturing method thereof can be provided without impairing the basic performance of the golf club shaft.

  Next, the present invention will be described more specifically based on examples.

  The materials for the golf club shafts produced in Examples 1 and 2 and Comparative Examples 1 and 2 are shown below. Here, the Roman letter code attached to the prepreg indicates the material of the prepreg corresponding to the prepregs 21 to 29 having the shapes of the patterns 1 to 9 shown in FIG.

Prepreg A: Carbon fiber prepreg HSX350C100S (thickness 0.076 mm, manufactured by Mitsubishi Rayon Co., Ltd.)
Prepreg B: Carbon fiber prepreg TR350C100S (thickness 0.084 mm, manufactured by Mitsubishi Rayon Co., Ltd.)
Prepreg C: Carbon fiber prepreg MRX350C100R (thickness 0.084 mm, manufactured by Mitsubishi Rayon Co., Ltd.)
Prepreg D: Carbon fiber prepreg MRX350C125R (thickness 0.106 mm, manufactured by Mitsubishi Rayon Co., Ltd.)
Prepreg E: Carbon fiber prepreg TR350E125S (thickness 0.113 mm, manufactured by Mitsubishi Rayon Co., Ltd.)
Prepreg F: Aluminum vapor deposited woven carbon fiber prepreg (reinforced fiber: TR50S-15L, fiber basis weight: 100 g / m ² , fiber bundle width: 20 mm, resin content: 40%, thickness 0.110 mm, Mitsubishi Rayon Co., Ltd. Made)
Prepreg G: Glass fiber prepreg GE352G075S (thickness 0.066 mm, manufactured by Mitsubishi Rayon Co., Ltd.)
Prepreg H: Carbon fiber prepreg MR350C150S (thickness 0.127 mm, manufactured by Mitsubishi Rayon Co., Ltd.)
Prepreg I: Woven carbon fiber prepreg (reinforced fiber: TR50S-15L, fiber basis weight: 100 g / m ² , fiber bundle width: 20 mm, resin content: 40%, thickness 0.109 mm, manufactured by Mitsubishi Rayon Co., Ltd.)
Prepreg J: Woven carbon fiber prepreg TR1120 350GMP (reinforced fiber: TR40S-1L, fiber basis weight: 120 g / m ² , fiber bundle width: 1 mm, resin content: 40%, thickness 0.150 mm, Mitsubishi Rayon Co., Ltd. Made)
Example 1
<Mandrel>
A mandrel 10 (made of iron) having the shape shown in FIG. 2 was prepared. The mandrel 10 has an overall length L3, the outer diameter of which gradually increases linearly from the narrow end P1 to the position (switching point) P2 of the length L1, and from the switching point P2 to the length L2. It consists of an iron cylinder whose outer diameter is constant up to the large diameter end P3. The specific outer diameter, length, and taper degree of each part of the mandrel 10 according to the present embodiment are as follows.

  The outer diameter of the small diameter end P1 is 4.60 mm, the outer diameter of the switching point P2 is 14.30 mm, the same outer diameter from the switching point P2 to the large diameter end P3, and the outer diameter is 14.30 mm. The length L1 from the small diameter end P1 to the switching point P2 is 1,200 mm, and the length L2 from the switching point P2 to the large diameter end P3 is 300 mm. The overall length L3 of the mandrel 10 is 1500 mm. Further, the degree of taper from the narrow end P1 to the switching point P2 is 8.08 / 1000.

<Cutting and winding of prepreg>
Each of the prepregs A to G was cut into patterns 1 to 9 shown in FIG. In the pattern 1, the prepregs cut at + 45 ° and −45 ° with respect to the longitudinal axis direction of the shaft are bonded to each other so as to be shifted substantially by a half circumference. The size was adjusted as shown in Table 1.

  In pattern 2, the fibers were oriented in the longitudinal direction of the shaft, and the size was adjusted as shown in Table 1.

  In patterns 3 to 6, the fibers were oriented in the longitudinal direction of the shaft, the total length was 1190 mm, and the size was adjusted as shown in Table 1.

  Pattern 7 is obtained by cutting a plain-woven carbon fiber prepreg. The warp of the woven fabric was oriented in the longitudinal axis direction, and the size was adjusted as shown in Table 1.

  The size of the pattern 8 was adjusted as shown in Table 1 so that the outer diameter of the narrow end portion was about 8.70 mm.

  The pattern 9 is obtained by cutting a glass fiber prepreg. The glass fibers were oriented in the longitudinal axis direction, and the size was adjusted as shown in Table 1.

  Next, the cut prepregs A to G were wound around the mandrel 10 in order. For winding, 100 mm from the small-diameter end of the mandrel was used as the winding end. The woven carbon fiber prepreg F in the plain weave form of the pattern 7 was wound after being attached to the prepreg D of the pattern 6 while being shifted in advance substantially by a half circumference. Winding was easy, and the part where the prepreg at the small diameter end of the shaft was bent greatly could be wound without loosening.

  Subsequently, a heat-shrinkable polypropylene tape (not shown) having a thickness of 20 μm and a width of 30 mm was wound and fixed at a winding pitch of 2 mm to obtain a shaft base tube formed on the mandrel 10.

<Hardening of resin and polishing of shaft surface>
The shaft base tube was put in a curing furnace and heated at 145 ° C. for 2 hours to cure the resin of the prepreg, and then the polypropylene tape and the mandrel 10 were removed. Both ends of the obtained golf club shaft base tube were cut by 10 mm to a total length of 1170 mm. The cantilever flex of the shaft before polishing (the amount of deflection at the small diameter end when a position of 920 mm from the small diameter end is fixed and a weight of 3 kg is hung at a position of 10 mm from the small diameter end) is 150 mm. It was. In addition, the outer diameter of the narrow end of the golf club shaft blank before polishing was 8.75 mm, and the outer diameter of the large end was 16.05 mm.

  The golf club shaft tube is polished with a cylindrical grinder so that the outer diameter of the narrow end is 8.50 mm and the cantilever flex is 155 mm. Thus, the golf club shaft of Example 1 is obtained. It was.

  The weight of the golf club shaft of Example 1 is 58.8 g, and the twist angle of the shaft (fixed at a position of 1035 mm from the shaft small diameter end and 138.5 kgf from the shaft small diameter end to the position of 50 mm from the shaft small diameter end). The angle at which the shaft twisted when a torque of mm was applied was 4.1 degrees.

  The golf club shaft of Example 1 had a plain weave depth throughout the shaft, had an appearance with a metallic luster, and was excellent in design. Table 2 shows the evaluation results of these golf club shafts.

(Example 2)
As shown in FIG. 4, the cutting size of the prepreg A of the pattern 1 in Example 1 was changed as shown in Table 1, the material C of the prepreg of the pattern 4 was changed to the material H, and the pattern 7 was a warp of the material F of the prepreg. A golf club shaft was produced in the same manner as in Example 1 except that the orientation of the weft was changed to ± 45 ° with respect to the longitudinal axis direction. Each evaluation was carried out in the same manner as in Example 1, and the evaluation results Is shown in Table 2. The winding of the thin shaft end of the pattern 7 was also good, the entire shaft had a plain weave depth, had a metallic luster, and had a good appearance.

(Comparative Example 1)
As shown in FIG. 5, a golf club shaft was produced in the same manner as in Example 1 except that the pattern 7 was changed to the material I of the prepreg material F, and each evaluation was performed in the same manner as in the example. The evaluation results are shown in Table 2. The winding of the thin shaft end of the pattern 7 was good and the entire shaft had a plain weave depth, but there was no metallic luster and the appearance was unsatisfactory.

(Comparative Example 2)
As shown in FIG. 5, a golf club shaft was prepared in the same manner as in Example 1 except that the pattern 7 was changed to the material J of the prepreg material F, and each evaluation was performed in the same manner as in the example. The evaluation results are shown in Table 2. Although the prepreg I was lifted in winding the thin end portion of the shaft of the pattern 7, it was difficult to wind a polypropylene tape, but a golf club shaft could be produced. The obtained golf club shaft was heavier than Examples 1 and 2, resulting in a lack of depth in appearance.

  As shown in Table 2, in the golf club shafts in Example 1 and Example 2, it is possible to obtain a golf club shaft that is lightweight and has a metallic luster and high design properties, whereas the golf club in Comparative Example 1 With the shaft for golf clubs, a golf club shaft with sufficient design could not be obtained. In the golf club shaft in Comparative Example 2, the process of winding the woven fiber reinforced resin layer was difficult, and the golf club shaft could not be obtained with sufficient design.

  Thus, in the golf club shafts in Example 1 and Example 2, the golf club shaft having high brightness and excellent metallic design without impairing the basic performance of the golf club shaft, and its The manufacturing method of the shaft for golf clubs made of fiber reinforced resin is realized.

10 Mandrel 21-29 Cutting shape of prepreg (layer) in winding order A-J Types of prepreg material La Shaft end cut length after molding Lb Shaft length after end cut Lc Long side of prepreg reinforcing piece at shaft tip Long Ld Short side length of the prepreg reinforcing piece at the shaft tip Le Le One side length of the triangular prepreg reinforcing piece at the shaft tip Lx, L _{12 to} L ₁₉ Pre-preg width at the small diameter side Ly, L _{22 to} L ₂₉ Large diameter side edge Prepreg width

Claims (5)

A shaft for a golf club made of fiber reinforced resin composed of a plurality of fiber reinforced resin layers, wherein the reinforcing fibers of the fiber reinforced resin layer are oriented in a direction of ± 30 ° to ± 60 ° with respect to the shaft axis direction a layer, the reinforcing fibers of the fiber reinforced resin layer, in substantially the straight layer oriented in the axial direction of the shaft, the weight per unit area of the reinforcing fibers in the outer layer 80g / m ² ~120g / m ² A fiber reinforced resin layer having a woven fiber reinforced resin layer on which metal is deposited on the surface of the reinforced fiber, and a glass fiber reinforced resin layer having a thickness of 50 μm to 100 μm on the outer layer. Plastic golf club shaft.   The fiber bundle of reinforcing fibers forming the woven fabric fiber reinforced resin layer is 2,000 to 18,000 filaments, and the width of the fiber bundle is 2 mm to 25 mm. Shaft for golf club made of fiber reinforced resin.   3. The fiber reinforced resin golf club shaft according to claim 1, wherein the woven fabric forming the woven fiber reinforced resin layer is a plain weave.   The fiber according to any one of claims 1 to 3, wherein the woven fabric-like fiber reinforced resin layer is attached to the straight layer oriented in the axial direction of the shaft while being substantially shifted by a half turn and integrated and wound. Manufacturing method of shaft for golf club made of reinforced resin. A method for producing a shaft for a golf club made of fiber reinforced resin comprising a plurality of fiber reinforced resin layers,
A step of winding a bias layer in which the reinforcing fibers of the fiber reinforced resin layer are oriented in a direction of ± 30 ° to ± 60 ° with respect to the shaft axial direction; and the reinforcing fibers of the fiber reinforced resin layer are substantially in the shaft axial direction a step of winding the straight layer oriented in a weight per unit area of the reinforcing fiber is ^{80g / m 2 ~120g / m 2} , and the fiber bundles of the reinforcing fibers is 2,000～18,000 filaments, And a step of winding a woven fiber reinforced resin layer in which a metal is deposited on the surface of the reinforcing fiber having a fiber bundle width of 2 to 25 mm, and a glass fiber having a thickness of 50 μm to 100 μm after the winding A method for manufacturing a shaft for a golf club made of fiber reinforced resin, comprising sequentially winding a reinforced resin layer.