JP4149236B2 - Golf ball and golf ball manufacturing method - Google Patents

Golf ball and golf ball manufacturing method Download PDF

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Publication number
JP4149236B2
JP4149236B2 JP2002315592A JP2002315592A JP4149236B2 JP 4149236 B2 JP4149236 B2 JP 4149236B2 JP 2002315592 A JP2002315592 A JP 2002315592A JP 2002315592 A JP2002315592 A JP 2002315592A JP 4149236 B2 JP4149236 B2 JP 4149236B2
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Japan
Prior art keywords
golf ball
mm
surface
less
coating layer
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JP2002315592A
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Japanese (ja)
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JP2004147836A (en
Inventor
健 朝倉
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Sriスポーツ株式会社
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a golf ball. Specifically, the present invention relates to an improvement in the aerodynamic characteristics of a golf ball.
[0002]
[Prior art]
The golf ball has a large number of dimples on its surface. The role of dimples is to promote turbulent flow transition in the boundary layer by disturbing the air flow around the golf ball during flight, thereby causing turbulent separation (hereinafter referred to as “dimple effect”). ). By promoting the turbulent transition, the separation point of air from the golf ball is shifted backward, the drag coefficient (Cd) is decreased, and the flight distance of the golf ball is increased. Various dimple improvements intended to improve flight performance have been proposed.
[0003]
[Patent Document 1]
[Patent Document 1] Japanese Patent Laid-Open No. 10-234885
[Problems to be solved by the invention]
A golfer's greatest concern with a golf ball is flight distance. The flight distance depends on the deformation behavior of the golf ball at the time of hitting and the aerodynamic characteristics at the time of flight. The dimple has the most influence on the aerodynamic characteristics. As described above, the dimples have been improved variously, but the golfer wants to further improve the flight distance. It is necessary to improve the aerodynamic characteristics from a viewpoint other than dimples. An object of the present invention is to improve the flight performance of a golf ball.
[0005]
[Means for Solving the Problems]
The golf ball according to the present invention includes a substantially spherical main body and a coating layer covering the main body. The 10-point average roughness Rz of the surface of this coating layer is 0.006 mm or more and 0.300 mm or less. The surface of the paint layer is rougher than the paint layer surface of a conventional golf ball. This coating layer contributes to the improvement of aerodynamic characteristics. This golf ball is excellent in flight performance. The reason why this golf ball is excellent in flight performance is unknown in detail, but it is presumed that minute concave portions formed on the surface of the coating layer reduce drag.
[0006]
Preferably, the total volume of the dimples is 270 mm 3 or more and 370 mm 3 or less. This golf ball has further excellent flight performance.
[0007]
A golf ball according to another invention includes a substantially spherical main body and a coating layer that covers the main body. The surface of the coating layer is divided into a high roughness region and a low roughness region. The 10-point average roughness Rz in the high roughness region is 0.006 mm or more and 0.300 mm or less. The 10-point average roughness Rz in the low roughness region is less than 0.006 mm. This paint layer can improve the aerodynamic symmetry of the golf ball.
[0008]
The golf ball manufacturing method according to the present invention includes the following steps.
(1) A step in which a coating layer is formed on the surface of a main body that is substantially a sphere.
And (2) a step of blasting the surface of the coating layer.
With this manufacturing method, a golf ball having excellent flight performance can be obtained.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.
[0010]
FIG. 1 is a partially cutaway sectional view showing a golf ball 1 according to an embodiment of the present invention. The golf ball 1 includes a spherical core 2, a cover 3, and a paint layer 4. A large number of dimples 5 are formed on the surface of the golf ball 1. A portion of the surface of the golf ball 1 other than the dimples 5 is a land 6. The core 2 and the cover 3 form a main body. The main body has dimples 5 on the surface, but is substantially a sphere. The coating layer 4 covers the main body.
[0011]
The diameter of the golf ball 1 is usually 40 mm to 45 mm, and further 42 mm to 44 mm. From the viewpoint of reducing air resistance within a range that satisfies the standards of the US Golf Association (USGA), the diameter is particularly preferably 42.67 mm or greater and 42.80 mm or less. The weight of the golf ball 1 is usually 40 g or more and 50 g or less, and further 44 g or more and 47 g or less. From the viewpoint of increasing the inertia within a range that satisfies the standards of the American Golf Association, the mass is particularly preferably 45.00 g or more and 45.93 g or less.
[0012]
FIG. 2 is an enlarged cross-sectional view showing a part of the golf ball 1 of FIG. In this figure, a cross section along a plane passing through the deepest part of the dimple 5 and the center of the golf ball 1 is depicted. As is apparent from FIG. 2, the coating layer 4 has a large number of minute recesses 7 on the surface. The surface roughness is increased by the recess 7. The recess 7 is presumed to promote turbulent transition when the golf ball 1 flies and contribute to drag reduction. The aerodynamic characteristics are improved by the recess 7 and the flight distance of the golf ball 1 is increased.
[0013]
As described above, the recess 7 is present on the surface of the coating layer 4. The recess 7 exists in both the dimple 5 and the land 6. The recess 7 does not reach the cover 3. The recess 7 is clearly distinguished from the dimple 5 in which both the coating layer 4 and the cover 3 are recessed.
[0014]
The 10-point average roughness Rz of the surface of the coating layer 4 is 0.006 mm or more and 0.300 mm or less. When the 10-point average roughness Rz is less than the above range, the improvement of the aerodynamic characteristics by the recess 7 may be insufficient. From this viewpoint, the 10-point average roughness Rz is more preferably 0.008 mm or more. If the 10-point average roughness Rz exceeds the above range, the shape of the dimple 5 may be damaged by the recess 7 and the flight distance of the golf ball 1 may be insufficient. From this viewpoint, the 10-point average roughness Rz is more preferably 0.200 mm or less. The 10-point average roughness Rz is measured in accordance with the rules of “JIS B 0601”.
[0015]
In manufacturing the golf ball 1, the core 2 is first formed. Next, a cover 3 is formed around the core 2. Simultaneously with the molding of the cover 3, the dimple 5 is formed. Next, a paint is applied to the surface of the cover 3. The paint layer 4 is obtained by drying the paint. Next, blasting is performed on the surface of the coating layer 4. In the blast treatment, fine particles are sprayed on the coating layer 4. A concave portion 7 is formed in the coating layer 4 by blasting. Due to the recesses 7, the surface roughness of the coating layer 4 is increased.
[0016]
The material of the blasting particles is not particularly limited. Specific examples of the material include alumina (# 60 to # 180 of ABRAX-R) and glass (# 30 to # 200). The average diameter of the particles is preferably 10 μm to 700 μm. The air pressure in the blast treatment is preferably 490 kPa to 785 kPa.
[0017]
The formation of the recess 7 may be performed by a method other than blasting. Examples of methods other than blasting include polishing, cutting, and soldering.
[0018]
In FIG. 2, a tangent line common to both ends of the dimple 5 is indicated by a virtual line T. The volume of the portion surrounded by the imaginary line T and the surface of the dimple 5 is the volume of the dimple 5. The total volume of the dimples 5 is preferably 270 mm 3 or more and 370 mm 3 or less. If the total volume is less than the above range, a hopping trajectory may occur. In this respect, the total volume is particularly preferably 290 mm 3 or more. If the total volume exceeds the above range, the trajectory may drop. From this viewpoint, the total volume is particularly preferably 350 mm 3 or less.
[0019]
The ratio of the total area of the dimples 5 to the surface area of the phantom sphere is referred to as the surface area occupation ratio. The surface area occupation ratio is preferably 70% or more and 90% or less. If the surface area occupation ratio is less than the above range, the lift of the golf ball 1 in flight may be insufficient. In this respect, the surface area occupation ratio is more preferably 72% or more, and particularly preferably 75% or more. If the surface area occupancy exceeds the above range, a hopping trajectory may occur. In this respect, the surface area occupation ratio is more preferably 88% or less, and particularly preferably 86% or less. The area of the dimple 5 is an area of a region surrounded by the edge line (that is, an area of a planar shape) when the center of the golf ball 1 is viewed from infinity.
[0020]
The depth of each dimple 5 is preferably 0.1 mm or greater and 0.6 mm or less. If the depth is less than the above range, a hopping trajectory may occur. In this respect, the depth is more preferably equal to or greater than 0.12 mm, and particularly preferably equal to or greater than 0.14 mm. If the depth exceeds the above range, the trajectory may drop. In this respect, the depth is more preferably equal to or less than 0.55 mm, and particularly preferably equal to or less than 0.50 mm. The ratio of the number of dimples 5 whose depth is included in the above range to the total number of dimples 5 is preferably 50% or more, more preferably 65% or more, and particularly preferably 80% or more. The depth is a distance from the imaginary line T to the deepest part of the dimple 5.
[0021]
The total number of dimples 5 is preferably 200 or more and 500 or less. When the total number is less than the above range, it is difficult to obtain the dimple effect. In this respect, the total number is more preferably 230 or more, and particularly preferably 260 or more. When the total number exceeds the above range, it is difficult to obtain the dimple effect. In this respect, the total number is more preferably 470 or less, and particularly preferably 440 or less.
[0022]
The dimple 5 to be formed may be a single type or a plurality of types. Instead of the circular dimple 5 or together with the circular dimple 5, a non-circular dimple (a dimple whose planar shape is not a circle) may be formed.
[0023]
Although the golf ball 1 shown in FIG. 1 has a two-piece structure, it is preferable that the concave portion 7 is formed in the coating layer 4 also in a multi-piece golf ball, a thread wound golf ball, or a one-piece golf ball.
[0024]
FIG. 3 is a front view showing a golf ball 8 according to another embodiment of the present invention. Although not shown, this golf ball 8 also includes a main body and a paint layer. For molding the golf ball 8, a mold composed of an upper mold and a lower mold is used. Each of the upper mold and the lower mold includes a hemispherical cavity. At the time of molding, the cover material flows out from the parting line between the upper mold and the lower mold, and burrs are generated. The burrs are removed by means such as grinding. In FIG. 3, what is indicated by a virtual line S is a seam. The seam S corresponds to the parting line of the mold. From the viewpoint of easy removal of burrs, the dimple 9 is not provided in the seam S. What is indicated by a symbol P in FIG. 3 is a pole.
[0025]
Two imaginary lines indicated by reference sign B in FIG. 3 are lines that divide the surface of the coating layer into a high roughness region H and a low roughness region L. The high roughness region H extends in a strip shape along the seam S. A region other than the high roughness region H is the low roughness region L. The low roughness region L is divided into two. The low roughness region L includes a pole P. Although not shown, in the high roughness region H, a large number of minute recesses are formed. The 10-point average roughness Rz in the high roughness region H is 0.006 mm or more and 0.300 mm or less. The 10-point average roughness Rz in the low roughness region L is less than 0.006 mm. The golf ball 8 can be obtained by performing a blasting process in a state where masking is performed in the vicinity of the pole P. The golf ball 8 may be obtained by polishing only the vicinity of the seam S.
[0026]
The flight distance of the golf ball 8 greatly depends on the surface state in the vicinity of the great circle with the fastest peripheral speed of backspin. When the great circle with the fastest peripheral speed of backspin coincides with the seam S, the high roughness region H contributes to the flight distance improvement. As described above, since the dimple 9 does not exist in the seam S, the dimple effect when the seam S coincides with the great circle having the fastest peripheral speed is small, but this is compensated by the concave portion existing in the high roughness region H. . This golf ball 8 is excellent in aerodynamic symmetry.
[0027]
The high roughness region H does not need to extend along the seam S, and the low roughness region L does not need to include the pole P. The positions of the high roughness region H and the low roughness region L are determined in consideration of dimple patterns, manufacturing errors, and the like.
[0028]
The ratio of the high roughness region H to the phantom spherical surface of the golf ball 8 is preferably 5% to 70%, and particularly preferably 10% to 40%. The ratio of the high roughness region H to the phantom spherical surface of the golf ball 8 is preferably 30% to 95%, particularly preferably 60% to 90%.
[0029]
【Example】
Hereinafter, although the effect of the present invention will be clarified based on examples, the present invention should not be construed limitedly based on the description of the examples.
[0030]
[Example 1]
A core made of solid rubber and having a diameter of 38.4 mm was put into a mold, and an ionomer resin composition was injected around the core to form a cover layer. The surface of the cover layer was painted and the paint was dried to obtain a painted layer. The surface of this paint layer was blasted to obtain a golf ball of Example 1. The air pressure for blasting was 640 kPa. For blasting, particles made of alumina were used. The average diameter of the particles was 330 μm. The 10-point average roughness of the paint layer in this golf ball was 0.020 mm, and the total volume of the dimples was 320 mm 3 .
[0031]
[Examples 2, 3, 6 and 7]
Golf of Examples 2, 3, 6 and 7 in the same manner as in Example 1 except that the air pressure and particle diameter of the blast treatment were changed so that the 10-point average roughness Rz was as shown in Table 1 below. I got the ball.
[0032]
[Examples 4 and 5]
Golf balls of Examples 4 and 5 were obtained in the same manner as in Example 1 except that the mold was changed so that the total volume of the dimples was as shown in Table 1 below.
[0033]
[Comparative Example 1]
A golf ball of Comparative Example 1 was obtained in the same manner as in Example 1 except that the blast treatment was not performed.
[0034]
[Flight distance test]
A No. 5 iron (“XXIO I # 5” from Sumitomo Rubber Industries, loft angle: 26 °, shaft hardness: S) was attached to a swing machine (manufactured by Golf Laboratory). A golf ball was hit under conditions where the head speed was 41 m / sec, and the ballistic elevation angle and flight distance (distance from the launch point to the drop point) were measured. The ballistic elevation angle is an angle between a straight line connecting the highest point of the ballistics and the launch point and a horizontal line. The average value of 20 measurement data is shown in Table 1 below.
[0035]
[Table 1]
[0036]
As shown in Table 1, the golf ball of the example has a greater flight distance than the golf ball of the comparative example. From this evaluation result, the superiority of the present invention is clear.
[0037]
【The invention's effect】
As described above, the golf ball of the present invention has excellent flight performance. This golf ball gives a refreshing feeling to a golfer who hits the golf ball and contributes to an improvement in score.
[Brief description of the drawings]
FIG. 1 is a partially cutaway sectional view showing a golf ball according to an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view showing a part of the golf ball 1 of FIG.
FIG. 3 is a front view showing a golf ball according to another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 8 ... Golf ball 2 ... Core 3 ... Cover 4 ... Paint layer 5, 9 ... Dimple 6 ... Land 7 ... Concave S ... Seam P ... Pole H ・ ・ ・ High roughness area L ・ ・ ・ Low roughness area

Claims (4)

  1. A golf ball comprising a substantially spherical main body and a coating layer covering the main body, and having a 10-point average roughness Rz of 0.020 mm to 0.100 mm on the surface of the coating layer.
  2. 2. The golf ball according to claim 1, wherein dimples are provided on a surface thereof, and a total volume of the dimples is 270 mm 3 or more and 370 mm 3 or less.
  3. A substantially spherical main body and a coating layer that covers the main body are provided, and the surface of the coating layer has a high roughness region in which many minute concave portions are formed, and a region other than the high roughness region. The 10-point average roughness Rz in the high roughness area is 0.020 mm or more and 0.100 mm or less , and the 10-point average roughness Rz in the low roughness area is 0. 0 or less . A golf ball that is less than 006 mm.
  4. A main body having a core and a cover, and a paint layer covering the main body;
    It has a large number of dimples and a large number of minute recesses on its surface,
    This dimple is formed on the cover,
    This recess is formed in the paint layer, and this recess does not reach the cover,
    A golf ball having a 10-point average roughness Rz of 0.020 mm to 0.100 mm on the surface of the coating layer.
JP2002315592A 2002-10-30 2002-10-30 Golf ball and golf ball manufacturing method Active JP4149236B2 (en)

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Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4754350B2 (en) * 2005-12-28 2011-08-24 Sriスポーツ株式会社 Golf ball
JP4663568B2 (en) * 2006-03-30 2011-04-06 Sriスポーツ株式会社 Golf ball
JP4756485B2 (en) * 2006-04-13 2011-08-24 Sriスポーツ株式会社 Golf ball
JP4756486B2 (en) * 2006-05-17 2011-08-24 Sriスポーツ株式会社 Golf ball
US20110077106A1 (en) * 2009-09-30 2011-03-31 Nike, Inc. Golf Ball Having An Aerodynamic Coating
US9409064B2 (en) 2009-09-30 2016-08-09 Nike, Inc. Golf ball having an aerodynamic coating including micro surface roughness
US9259623B2 (en) * 2009-09-30 2016-02-16 Nike International, Ltd. Golf ball having an aerodynamic coating including micro surface roughness
WO2013012796A2 (en) * 2011-07-15 2013-01-24 Nike International Ltd. Golf ball having an aerodynamic coating including micro surface roughness
US9381404B2 (en) 2009-09-30 2016-07-05 Nike, Inc. Golf ball having an increased moment of inertia
US9186558B2 (en) 2009-09-30 2015-11-17 Nike, Inc. Golf ball having an aerodynamic coating including micro surface roughness
US9199133B2 (en) 2009-09-30 2015-12-01 Nike, Inc. Golf ball having an aerodynamic coating including micro surface roughness
US9033825B2 (en) 2009-09-30 2015-05-19 Nike, Inc. Golf ball having an aerodynamic coating including micro surface roughness
US9033826B2 (en) 2009-09-30 2015-05-19 Nike, Inc. Golf ball having an aerodynamic coating including micro surface roughness
US9186557B2 (en) 2009-09-30 2015-11-17 Nike, Inc. Golf ball having an aerodynamic coating including micro surface roughness
US9108085B2 (en) 2009-09-30 2015-08-18 Nike, Inc. Golf ball having an aerodynamic coating including micro surface roughness
US9320942B2 (en) 2010-01-20 2016-04-26 Nike, Inc. Golf ball with cover layer having zones of differing materials
US8529375B2 (en) * 2010-01-20 2013-09-10 Nike, Inc. Golf ball having increased moment of inertia
US8602915B2 (en) * 2010-11-01 2013-12-10 Nike, Inc. Golf ball with changeable dimples
JP6533364B2 (en) * 2013-12-27 2019-06-19 住友ゴム工業株式会社 Golf ball and method of manufacturing the same
JP2015142600A (en) * 2013-12-27 2015-08-06 ダンロップスポーツ株式会社 Golf ball and production method thereof
JP6239405B2 (en) * 2014-02-25 2017-11-29 美津濃株式会社 Golf ball
JP6478629B2 (en) 2014-12-26 2019-03-06 住友ゴム工業株式会社 Golf ball and method of manufacturing the same
JP6478628B2 (en) 2014-12-26 2019-03-06 住友ゴム工業株式会社 Golf ball and manufacturing method thereof.

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