JP2016049256A - Golf club shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a golf club shaft having external appearance with excellent design properties in the golf club shaft having various types of decorations on the surface of a body layer.SOLUTION: A golf club shaft 10 according to the present invention includes: a body layer 20 molded of a fiber-reinforced resin material, where a reflectance of the surface is set to 10-50% by a metal thin film provided on the surface or a silver coating consisting primarily of silver; and a decoration layer 30 provided on the surface of the body layer, where the height thereof with respect to the surface of the body layer is set to 25-100 μm. The body layer 20 is so formed that the surface roughness (Rz) thereof is 2 μm or less. The reflectance of the decoration layer 30 is set higher than that of the surface of the body layer 20 by 10% or more.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a golf club shaft, and more particularly, to a golf club shaft having decorations such as letters and patterns on its outer peripheral surface.

  Conventionally, it is known that a golf club shaft is formed by a fiber reinforced resin (FRP), and various coating layers (hereinafter also referred to as a main body layer) are formed on the surface thereof. For example, in Patent Document 1, a glossy coating layer is formed on the surface of a main body (tube material) formed into a tubular shape by a fiber reinforced resin by physical vapor deposition (PVD) such as vacuum vapor deposition, sputtering, or ion plating. It is disclosed. For example, Patent Document 2 discloses that the surface of a tube material is subjected to silver coating (silver mirror coating), and the appearance of the FRP shaft is finished like a steel shaft.

  Further, on the surface of the main body layer formed as described above (the outer peripheral surface of the shaft main body), a character such as a logo or a pattern such as a pattern (hereinafter also referred to as decoration) may be formed. Has been done. Usually, it is known that the decoration is formed in the same plane as the surface of the main body layer by printing or the like, or is three-dimensionally formed by attaching a decoration seal as disclosed in Patent Document 3.

JP 7-79669 A JP-A-11-318279 JP 2013-78322 A

  By the way, the above-described decoration has room for improvement in view of design properties such as visibility and luxury by simply forming it on the surface of the main body layer by printing, sticking or the like. For example, if the decoration is coplanar with the surface of the main body layer (mainly obtained by printing, etc.), it gives a strong impression that the decorative portion is flat between the main body layer when visually recognized. It is not possible to get a high-class feeling. In addition, when the above-described decorative seal is used, a three-dimensional appearance can be obtained when visually recognized, but if the relationship with the surface of the main body layer is not sufficiently taken into consideration, the visibility (recognition) and / or It is inferior in terms of luxury.

  Further, in the case of a golf club shaft, when a main body layer is formed on the surface of a shaft forming material (fiber reinforced resin; FRP) and decorated from above, the main body layer It is considered that it is desirable to set the configuration of the above and the configuration of the decorative part formed thereon in an appropriate state (relationship). Specifically, regarding the relationship between the reflectances of the two, the state of the surface of the main body layer (surface roughness), and the height of the decoration (decoration layer), by setting these to preferable conditions, the golf club shaft can be visually recognized. It is possible to obtain a golf club that has a good appearance and a high-class feeling and has an excellent design, and that has high user satisfaction.

  The present invention has been made paying attention to the above-described problems, and an object of the present invention is to provide a golf club shaft having an appearance excellent in design in a golf club shaft having various decorations on the surface of a main body layer. To do.

  In order to achieve the above object, a golf club shaft according to the present invention is provided on the surface of a golf club shaft formed of a fiber reinforced resin material, and the surface is reflected by a metal thin film or silver coating mainly composed of silver. A main body layer set at a rate of 10 to 50%, and a decorative layer provided on the surface of the main body layer and having a height with respect to the surface of the main body layer set to 25 to 100 μm. The layer is formed so that the surface roughness (Rz) is 2 μm or less, and the decoration layer is set so that the reflectance is higher by 10% or more than the surface of the main body layer. It is characterized by.

  When decorating the surface of the golf club shaft (the surface of the main body layer), if the difference between the reflectivity of the main body layer and the reflectivity of the decorative layer is large, the decorative portion can be easily recognized. Here, in the present invention, the reflectance of the decoration layer is set to be higher (more than 10% higher) than the reflectance of the surface of the main body layer in consideration of the special feature of the golf club shaft. This is because, in a golf club, if there are many highly reflective areas, there is a possibility that the reflected light may affect the play when the player addresses. That is, by setting the reflectance on the side of the main body layer, which has a large surface area, to be low, and setting the reflectance of a decorative part, which has a narrow surface area, such as logos and letters, to a high level, the main body layer is not affected. It is possible to make it easier to visually recognize the decorative portion between the two.

  Moreover, about the height of a decoration layer, and the difference of the reflectance of a main body layer and the reflectance of a decoration layer, by setting to 25-100 micrometers and 10% or more, respectively based on the result of an evaluation test. It is possible to achieve an appearance with good visibility and high-class feeling. Specifically, when the height of the decoration layer is lower than 25 μm, it is evaluated that the decoration portion tends to look flat between the main body layer when visually recognized, and a high-class feeling cannot be obtained. On the other hand, when the height is higher than 100 μm, the difference in height tends to be grasped, resulting in an evaluation that a sense of incongruity is caused and design properties are lowered. In particular, if it is higher than 100 μm, another problem in appearance such as generation of bubbles in the stepped portion occurs, which is not preferable. In addition, regarding the difference in reflectance, when it is smaller than 10%, the distinction between the surface of the main body layer is lowered, and it is difficult to grasp the boundary portion between the decoration layer and the main body layer. . In particular, if both colors are the same color, for example, the surface of the main body layer is silver-coated and the decorative layer is also a silver-based color, even if the height of the decorative layer is 25 to 100 μm, the difference in reflectance Evaluation that the decoration layer became difficult to visually recognize when 10 became smaller than 10% was obtained.

  Furthermore, the main body layer becomes a mirror surface when its glossiness is increased (specifically, it is formed so that the surface roughness (Rz) is 2 μm or less), and in this state, the decoration layer has a high reflectance. If this is provided, the decorative layer comes to the surface and it is possible to finish it with a high-quality appearance. In particular, when the main body layer is formed by silver coating and the decoration layer is silver-based to increase the difference in reflectance between the two (for example, 40% or more), it is possible to obtain a higher-grade appearance. . That is, in the conventional golf club, when the shaft is finished in a mirror surface shape, it is considered difficult to visually recognize that the surface has a planar decoration having a higher reflectance than that, but as described above. By making the decorative part thick and providing a certain difference in reflectance, it is possible to obtain an appearance with excellent design.

  According to the present invention, in a golf club shaft having various decorations on the surface of the main body layer, an appearance with excellent design can be obtained.

The figure which shows the golf club which mounted | wore with the golf club shaft which concerns on this invention. Sectional drawing of the decoration layer part provided in the golf club shaft. Sectional drawing of the decoration seal | sticker which comprises the decoration layer shown in FIG. The external appearance of the shaft in the evaluation test was photographed. (A) is a photograph showing a shaft with a reflectance difference of 40%, and (b) is a photograph showing a shaft with a reflectance difference of 8%.

Hereinafter, an embodiment of a golf club shaft according to the present invention will be described with reference to FIGS.
FIG. 1 is a view showing a golf club 1 having a golf club shaft (hereinafter referred to as a shaft) 10 according to the present invention, FIG. 2 is a sectional view of a decorative layer portion provided on the golf club shaft, and FIG. These are sectional drawings of the decoration seal which comprises the decoration layer shown in FIG.

  As is well known, the golf club 1 is configured by mounting a head (iron type, wood type, putter type, etc.) 5 that hits the tip of the shaft 10 and a grip 7 on the base end side.

As is well known, the shaft 10 is formed by a conventional method such as heating, firing, and decentering by winding a fiber reinforced prepreg in which a reinforcing fiber is impregnated with a synthetic resin around a core metal. A main body layer 20 is formed over the entire outer peripheral surface (surface) of the tube material 10A thus formed, and a decoration 30 such as a logo or a pattern is formed on a part of the surface of the main body layer 20. (The decoration 30 is also referred to as a decoration layer because it has a certain thickness as will be described later).
Hereinafter, the configuration of the main body layer 20 and the decoration layer 30 will be specifically described.

  The main body layer 20 of the present embodiment is formed by spraying a paint containing silver as a main component (silver coating or silver colloid coating). In this case, the silver coating (silver colloid coating) in the present embodiment uses the one that reduces the ammoniacal solution of silver nitrate and deposits metallic silver (so-called silver mirror reaction) as disclosed in Patent Document 2. Instead, it means a material that can be painted by spraying on the surface of the molded tube material, for example, a material formed by spraying a resin (paint) in which silver nanoparticles are dispersed.

  Thus, by applying using a paint mainly composed of silver, the main body layer 20 can be easily formed as compared with the one using the silver mirror reaction described above, and the adhesion with the tube material 10A is improved. Durability is improved and the reflectance can be kept low. Furthermore, the unevenness of the surface can be reduced as compared with the coating by silver mirror reaction, and the glossiness can be increased (finished into a mirror surface). In addition, about the coating material which has silver as a main component, you may apply a squeeze coating or an inkjet-type coating other than spray coating, and smoothness will improve by a squeeze coating, and the improvement of a reflectance can be aimed at.

  The main body layer 20 is set to have a reflectance of 10 to 50% so that it can be set lower than the reflectance of the decorative layer 30 described later with a certain difference in reflectance. That is, with respect to the reflectance of the main body layer 20, considering that it is a shaft for a golf club, there is no hindrance to play due to reflected light at the time of addressing, and the reflectance difference with the decoration layer is increased. As described above, it is set to 10% to 50% as described above. That is, the reason why the reflectance of the main body layer 20 is set in such a range is that when the reflectance of the main body layer exceeds 50%, it is necessary to increase the reflectance of the decorative layer 30 accordingly. This is because a highly brilliant decoration is present in a high-quality background and visibility decreases. Further, if the reflectance of the main body layer 20 is lower than 10%, the high-grade feeling as the shaft is lowered.

  Further, the roughness of the surface of the main body layer 20 is too rough, so that the gloss is lost and the sense of quality is lowered. Specifically, with respect to the surface roughness, if Rz (ten-point average roughness) exceeds 2 μm, the degree of irregular reflection tends to increase and the glittering feeling (glossiness) tends to decrease. Since the feeling is also reduced, the surface roughness (Rz) of the main body layer 20 is formed to be 2 μm or less, preferably 1 μm or less to be a mirror surface.

  In the present embodiment, the main body layer 20 having such a surface roughness can be easily formed by applying silver coating as described above, but before forming the main body layer 20, the main body layer 20 was formed into a tubular shape. The surface of the fiber reinforced resin material (tube material 10A) is polished (for example, polishing with a belt sander), or the resin is applied over the entire surface (forms an underlayer), and the surface is polished to smooth the surface. It is preferable to keep it. That is, by polishing and smoothing the surface of the tube material 10A, the surface roughness (Rz) described above can be easily reduced to 2 μm or less while suppressing irregularities on the surface of the silver coating. Or about the silver coating which comprises the main body layer 20, it becomes possible to make the surface roughness low by using a squeeze coating other than spray coating.

  The reflectance of the main body layer 20 and the decoration layer 30 is measured using a spectrocolorimeter (CM-700d / 600d) manufactured by KONICA MINOLTA, with a measurement angle of 8 ° based on the JIS standard. . Further, the roughness of the surface of the main body layer 20 is measured using SURFTEST301 manufactured by MITUTOYO.

  The main body layer 20 is preferably formed to have a thickness of 0.02 to 0.15 μm. This is because if the film thickness is made thinner than 0.02 μm, it is easy to pick up the color of the material (tube material), the reflectivity is lowered, and the design property (luxury feeling) as a mirror surface appearance is lowered. Further, when the film thickness is larger than 0.15 μm, the adhesion between the material and the material tends to be reduced, and peeling or the like is likely to occur. This is because cracks are likely to enter and the beauty cannot be formed (maintained).

  Further, with respect to the main body layer 20, it is preferable to provide a black base layer between the main body layer 20 and the tube material if the reflectivity is high to some extent. By providing the black base layer in this way, it is easy to detect foreign matters such as dust when coating is performed to form the main body layer 20, and it is easy to detect defective coating. Alternatively, when the main body layer 20 is formed as a metal film having a thickness of about 0.02 μm (for example, formed by PVD or the like), the base layer is picked up in order to pick up the color of the base while maintaining visibility as a mirror surface. By using a white color, it is possible to brighten the color of the metal coating (increase glossiness). A white color that does not contain glittering particles and pigments is slightly inferior to a black color, but it is possible to detect defective coating.

  After the main body layer 20 is formed, a protective layer 22 is preferably formed on the surface by clear coating or the like. By forming such a protective layer 22, when the decorative layer 30 is configured with a seal (decorative seal 30 </ b> A) as in the present embodiment, peeling of the main body layer is effective when the seal is reapplied. Can be prevented. In addition, since a light absorption will be absorbed and a reflectance will fall when a protective layer uses a colored thing, it is preferable to use a transparent thing. Moreover, about the film thickness of the protective layer 22, since a weight will increase, if too thick, and the peeling prevention effect will fall if it makes too thin, it is preferable to form the film thickness in the range of 5-30 micrometers.

  The above-described main body layer 20 is formed as described above if the surface reflectance is 10 to 50% and the surface roughness (Rz) is 2 μm or less. It is not limited to silver paint. For example, a deposition material of metal (aluminum, gold, silver, stainless steel, titanium, etc.) may be formed on the surface by PVD such as vacuum deposition, sputtering, or ion plating.

Next, the configuration of the decoration layer 30 will be described.
As described above, the decoration layer 30 is provided so as to have a height of 25 to 100 μm with respect to the surface of the main body layer 20. In the present embodiment, the decorative layer 30A is attached to the surface of the main body layer 20 so that the decorative layer having such a height can be easily formed.

  The decorative seal 30A of the present embodiment is a transmission made of a flexible resin film having an acrylic pressure-sensitive adhesive layer 31 and a metal vapor-deposited layer 35 having a glittering material deposited on one surface by vapor deposition. A predetermined character, pattern, or the like is formed by the metal vapor deposition layer 35. In this case, the metal vapor-deposited layer 35 reflects the light incident from the transmission layer 33 so as to exhibit a bright color. For example, the metal vapor-deposited layer 35 has a high glitter such as silver, aluminum, aluminum foil, chromium, and stainless steel. It is used so that a reflectance higher than that of the main body layer 20 can be obtained. Moreover, about the transmissive layer 33, it is possible to give a color as a decoration and to reduce a reflectance by using a colored layer.

  The pressure-sensitive adhesive layer 31 has a thickness of 5 to 50 μm, the metal vapor deposition layer 35 has a thickness of 0.02 to 0.15 μm, and the transmission layer 33 has a thickness of 1 to 75 μm. As described above, the total thickness T is configured to be in the range of 25 to 100 μm. Although a seal thinner than 25 μm and a seal thicker than 100 μm can be created, the conditions set this time do not apply. Further, the transmission layer 33 may be a single layer, or may be 2 to 3 layers for coloring. A release film (mounting paper) 37 is attached to the back surface of the pressure-sensitive adhesive layer 31, and a protective film 38 is attached to the surface of the transmission layer 33. A decorative seal 30 </ b> A is affixed to the layer 20, and then the protective film 38 is peeled off, whereby the decorative layer 30 having a predetermined thickness is formed on the surface of the main body layer 20.

  In this case, in this embodiment, since the protective layer 22 is formed on the surface of the main body layer 20, when the decorative seal 30A is reapplied, peeling of the main body layer 20 and the like can be effectively prevented. Moreover, it is preferable to form the protective layer 40 with a film thickness of 10 to 30 μm (preferably 20 to 25 μm) on the surface of the decorative layer 30 by clear coating or the like. Such a protective layer 40 can deepen the boundary between the main body layer 20 and the decorative layer 30 to improve the appearance and protect the appearance of the surface (seal surface) of the decorative layer. It becomes possible to prevent peeling of the decorative seal. In addition, when a colored material is used, the difference in reflectance between the decorative layer and the main body layer is 10% or more, and the reflectance of the main body layer is not less than 10%.

  As described above, in the present invention, the decorative layer 30 having a thickness of 25 to 100 μm is provided on the main body layer 20 having a surface reflectance of 10 to 50% and a surface roughness (Rz) of 2 μm or less. It is characterized by that. In this case, the reflectance and surface roughness of the main body layer 20 are set in the above-described ranges because the appearance of the golf club shaft is high-quality in terms of glossiness and gloss (in terms of design, excellent appearance). The reason why the thickness of the decorative layer 30 is set in the above-described range is that the outline portion can be visually recognized when a logo such as a letter is attached, and a high-class feeling is obtained together with the main body layer. (If the decorative layer 30 is flush with the surface of the main body layer 20, an inexpensive impression is given).

  Further, by giving the surface of the main body layer 20 glitter and glossiness, it is possible to give a high-class appearance as the appearance of the shaft of the golf club, and when the decorative layer 30 with a logo such as letters is formed on the surface, Since the decorative layer 30 also has glitter, it is possible to give a high-class feeling to the decorative layer. As described above, in the present invention, the reflectance on the decoration layer 30 side is made higher than the reflectance on the main body layer 20 side to increase the visibility of the decoration layer 30, and the difference in reflectance is calculated. By setting it to be 10% or more from the following evaluation test, it is easy to visually recognize the decorative layer portion, and a high-class feeling of the decorative layer portion is obtained. That is, regarding the difference in reflectance between the main body layer 20 and the decorative layer 30, the following appearance evaluation test was performed, and an appropriate difference in reflectance was examined.

The main body layer 20 of the golf club shaft was formed by spraying a paint containing silver and by a silver-based metal film by ion plating. In this case, a plurality of shafts having different surface reflectivities are prepared, and the decorative seal 30 having the same configuration and glitter is attached to the surface of each shaft, and the appearance thereof is evaluated by a plurality of evaluators (A to E-5). Name) evaluated the visibility and luxury. Each of the prepared shafts has a silver appearance and a surface roughness (Rz) of 2 μm or less and is formed in a mirror shape, and is formed to have a different reflectance.
The decorative seal 30A to be applied is a silver-based material having a metal vapor-deposited layer 35 and having a reflectivity of 65% (a mirror-finished seal) with a height of 50 μm. Was used.

  Table 1 below shows the results of the evaluation test. In this evaluation test, the difference in reflectance between the main body layer 20 and the decorative layer 30 is 4%, 6%, 8%, 10%, 12%, 15%, 20%, 25%, 30%, and 40%. Ten shafts were prepared, and the visibility of the decorative layer portion and the high-quality feeling were evaluated for each shaft. As for the evaluation method, the decorative layer 30 is easy to see (appears conspicuously with respect to the main body layer) and has a high-quality feeling (◎), and both have a good feeling (○), only one of them. (△), the decorative layer was difficult to visually recognize, or the case where a high-class feeling was not felt so much (×).

上記した評価試験によれば、少なくとも反射率の差が１０％以上に設定されていれば、視認性および高級感の面で良好な結果が得られるようになる。この場合、評価試験では、銀系の本体層２０に銀系の装飾層３０を貼付しているため、反射率の差が低い（１０％）と、視認性の面で多少見え難くなるという評価になったが、両者を異なる色彩にすれば、反射率の差が１０％あれば視認性はより良好になるものと考えられる。すなわち、表面が平滑化されて反射率が１０〜５０％に設定された本体層２０に対して、反射率の差が１０％以上で、厚さが２５〜１００μｍの装飾層３０を設けることにより、視認性が良く、高級感のある外観のゴルフクラブシャフトを得ることが可能となる。

According to the evaluation test described above, at least if the difference in reflectance is set to 10% or more, good results can be obtained in terms of visibility and luxury. In this case, in the evaluation test, since the silver-based decorative layer 30 is pasted on the silver-based main body layer 20, the evaluation is such that the difference in reflectance is low (10%) and the visibility is somewhat difficult to see. However, if the two colors are different, the visibility is considered to be better if the difference in reflectance is 10%. That is, by providing the decorative layer 30 having a difference in reflectance of 10% or more and a thickness of 25 to 100 μm with respect to the main body layer 20 whose surface is smoothed and the reflectance is set to 10 to 50%. Thus, it is possible to obtain a golf club shaft with good visibility and a high-class appearance.

  4A and 4B are photographs of the appearance of the shaft used in the evaluation test described above. FIG. 4A shows that the difference in reflectance is 40%, and FIG. 4B shows that the difference in reflectance is 8%. ing. As can be seen in the two comparative photographs, when the difference in reflectance is 8% (see FIG. 4B), the decoration layer part is melted into the main body layer as the background, and the visibility is lowered. End up. On the other hand, when the difference in reflectance is 40%, the decorative layer portion can be seen as if it floats up from the main body layer as the background, and its outline can be clearly grasped, giving it a high-class appearance. It will be obtained.

As mentioned above, although embodiment of this invention was described, this invention is not limited to above-described embodiment, It is possible to implement in various deformation | transformation in the range which does not deviate from the summary.
In the above-described embodiment, the decoration layer 30 is configured as a seal. However, in addition to the seal, the decoration layer 30 may be formed by thickly providing ink on the surface of the main body layer, for example, by inkjet or screen printing.

DESCRIPTION OF SYMBOLS 1 Golf club 10 Golf club shaft 10A Tube material 20 Main body layer 30 Decoration layer 30A Decoration seal 31 Adhesive layer 33 Transmission layer 35 Metal vapor deposition layer

Claims (4)

A body layer provided on the surface of a golf club shaft formed of a fiber reinforced resin material, and having a surface reflectance of 10 to 50% by silver coating mainly composed of a metal thin film or silver;
A decorative layer provided on the surface of the main body layer, the height of the main body layer with respect to the surface being set to 25 to 100 μm;
A golf club shaft having:
The body layer is formed so that its surface roughness (Rz) is 2 μm or less,
The golf club shaft according to claim 1, wherein the decoration layer is set to have a reflectance of 10% or more with respect to a surface of the main body layer. The main body layer has a thickness of 0.02 to 0.15 μm, and a protective layer having a thickness of 5 to 30 μm is formed on the surface immediately above the main body layer.
The golf club shaft according to claim 1, wherein a decorative seal constituting the decorative layer is attached to a surface of the protective layer.   The golf club shaft according to claim 1, wherein a protective layer having a thickness of 10 to 30 μm is formed on the surface of the decoration layer.   4. The golf club shaft according to claim 1, wherein a black or white base layer is provided between the main body layer and the shaft material. 5.

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