WO2005002681A1 - ゴルフボール及びその製造方法 - Google Patents
ゴルフボール及びその製造方法 Download PDFInfo
- Publication number
- WO2005002681A1 WO2005002681A1 PCT/JP2004/009893 JP2004009893W WO2005002681A1 WO 2005002681 A1 WO2005002681 A1 WO 2005002681A1 JP 2004009893 W JP2004009893 W JP 2004009893W WO 2005002681 A1 WO2005002681 A1 WO 2005002681A1
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- Prior art keywords
- core
- hardness
- groove
- main body
- golf ball
- Prior art date
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Classifications
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/0003—Golf balls
- A63B37/007—Characteristics of the ball as a whole
- A63B37/0077—Physical properties
- A63B37/0097—Layers interlocking by means of protrusions or inserts, lattices or the like
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/0003—Golf balls
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/02—Special cores
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/12—Special coverings, i.e. outer layer material
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B45/00—Apparatus or methods for manufacturing balls
Definitions
- the present invention relates to a golf ball having a spherical core and a force par covering the core.
- a conventional so-called "piece-piece” golf ball is disclosed, for example, in Japanese Patent Application Laid-Open No. 62-270178.
- the cover and the core are brought into close contact with each other through this concave / convex shape, so that the adhesion between the core and the force par is improved.
- the amount of transmitted energy can be reduced, and the resilience performance can be improved.
- the present invention has been made in order to solve the above problems, and has as its object to provide a golf ball having both high resilience and a soft feeling when hit.
- the present invention provides a golf ball comprising a spherical core and a force par covering the core, wherein the core has grooves on three large circles orthogonal to each other on the surface of the core. And a protrusion that fits into the groove is formed on the inner surface of the cover.
- the golf pole according to the present invention can have both high resilience and soft feel at the time of hitting.
- the grooves may be arranged so as to extend continuously along the great circle, or may be arranged at multiple positions on the great circle. It is preferable that the plurality of fins are arranged so as to be substantially at a point ⁇ ⁇ ⁇ ⁇ with respect to the center of the core. This makes it possible to obtain substantially uniform resilience performance and soft feel even when hit at any position on the pole surface.
- the core may include a spherical main body and an intermediate layer covering the surface of the main body, and the groove may be formed on the surface of the intermediate layer. Also in this case, the energy loss transmitted between the force par and the intermediate layer can be suppressed, so that the resilience performance can be improved.
- the intermediate layer when the intermediate layer is provided in this manner, the hardness of the main body portion and the hardness of the intermediate layer can be made different, so that desired characteristics according to various conditions such as a head speed can be easily obtained. become.
- the middle layer by making the hardness of the middle layer higher than the hardness of the main body and lowering the hardness of the force par than that of the middle layer, the middle layer maintains good resilience performance and improves flight distance, The feeling can be improved by the force par.
- the main body and the cover maintain good resilience performance and improve flight distance.
- the feeling can be improved by the intermediate layer.
- there are many irregularities on the surface of the core. ⁇ ⁇ ⁇ ⁇ If you did not use the taste, you could not remove the core and had the problem of low productivity. For this reason, in the present invention, even when a pair of molds that are divided into two are used, the groove is formed so that the core can be easily removed without catching the groove on the mold. .
- the cross section of the core has a sector shape, and while the arc portion of the sector matches the surface of the core, a band extending along three great circles drawn on the surface of the core and intersecting with each other is drawn on the core.
- a groove is formed on the surface of the core by partially drawing a portion of the band portion by drawing a virtual surface on the surface and perpendicular to a normal line of the core passing through a center between intersections of great circles.
- the force S is preferably such that the depth of the groove from the surface of the core is 1 to 2 mm. This is because if the depth of the groove is smaller than 1 mm, a gap occurs between the core and the force par, resulting in a large energy loss at the time of hitting and a reduction in the effort performance. On the other hand, if it is larger than 2 mm, the protruding portion is too tightly fitted into the groove, so that the hit feeling is deteriorated.
- the golf pole according to the present invention can be manufactured by various methods.
- a golf pole having a core formed by drawing the above-mentioned band portion can be formed as follows. That is, the dividing line is formed on a plane having a projection corresponding to the groove on the inner wall surface and intersecting at right angles to one of the three great circles and intersecting the deviation of the other two great circles at an angle of 45 degrees.
- a first step of preparing a core mold that is divided into two parts having: a second step of filling a core mold material into the core mold and forming a core by compression molding; and It can be manufactured through a third step of coating the surface of the core formed by the two steps with the force par. This facilitates the removal of the core from the core mold.
- the second step after the spherical main body is accommodated in the core forming die, the hardness of the ttns main body is set in a gap between the key body and the core wing.
- the main body when the main body is accommodated in the core structure, the main body can be supported at the center of the core structure by the protrusions formed on the inner wall surface. (I.e., displacement between the center and the center of gravity) can be reliably prevented.
- FIG. 1 is a sectional view showing a first embodiment of a golf ball according to the present invention.
- FIG. 2 is a front view (a) and a plan view (b) of the core of the golf ball of FIG.
- FIG. 3 is a cross-sectional view showing a second embodiment of the golf pole according to the present invention.
- FIG. 4 is a front view (a) and a side view (b) of the core of the gonofole in FIG.
- FIG. 5 is a cross-sectional view of the core for describing a method of forming the groove of the core shown in FIG.
- FIG. 6 is a perspective view of the core for explaining a method of forming the groove of the core shown in FIG.
- FIG. 7 is a perspective view showing three cut-out portions for explaining a method of forming a groove of the core shown in FIG.
- FIG. 8 is an enlarged view of a groove of the core shown in FIG.
- FIG. 9 is a front view (a) and a rule view (b) showing a modification of the core shown in FIG.
- FIG. 10 is a sectional view showing a third embodiment of the golf pole according to the present invention.
- 11A and 11B are a side view (a) and a perspective view (b) for explaining a method of forming the core of the golf ball shown in FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- Figure 1 is a book 1 is a cross-sectional view of a golf bow nose according to the present invention.
- the golf pole of the present embodiment is a so-called two-piece golf pole including a core 1 and a force par 3 covering the core.
- the diameter of the golf ball must be at least 42.67 mm, as required by regulations (see R & A and USGA). However, in consideration of aerodynamic characteristics and the like, it is preferable that the pole diameter be as small as possible, for example, 42.7 mm.
- Fig. 2 (a) is a front view of the core
- Fig. 2 (b) is a plan view of the core.
- the core 1 is formed in a spherical shape and is made of a rubber composition.
- the core 1 preferably has a diameter of 37.5 to 40.7 mm, more preferably 38.1 to 39.5 mm. This is because if the diameter is smaller than 37.5 imn, the thickness of the copper layer becomes large and the feeling of fl3 ⁇ 4 becomes worse. On the other hand, if it is larger than 40.7 mm, it is necessary to reduce the thickness of canopy 3, so that the durability is reduced.
- the core 1 preferably has a Shore D hardness of 40 to 55.
- a groove 5 having a V-shaped cross section is formed on the surface of the core 1, and the groove 5 is formed along three great circles which are drawn on the surface of the core 1 and are orthogonal to each other. Then, on the surface of the core 1, eight regions 7 surrounded by the grooves 5 are formed.
- the depth D of the groove 5, that is, the length in the judgment direction from the surface of the core 1 to the deepest part of the groove 5 is preferably 1.0 to 2.0 mm, and 1.5 to 1.8 mm. Is more preferable. The reason will be described
- the core 3 can be manufactured from a known rubber composition containing a base rubber, a cross-linking material, a metal salt of an unsaturated carboxylic acid, a filler and the like.
- a base rubber natural rubber, polyisobrene rubber, styrene butadiene rubber, EPDM, etc. can be used, but high cis polybutadiene having at least 40% or more, preferably 80% or more of cis 1,4 bonds should be used. Is particularly preferred.
- an organic peroxide such as dicumyl peroxide-t-butyl peroxide can be used, but dicumyl peroxide is particularly preferred. Les ,.
- the compounding amount is 0.3 to 5 parts by weight, preferably 0.5 to 2 parts by weight, based on 100 parts by weight of the base rubber.
- Metal salts of unsaturated carboxylic acids include carbons such as acrylic acid or methacrylic acid. It is preferable to use a metal salt of a monovalent or divalent unsaturated carboxylic acid having a prime number of 3 to 8, but it is particularly preferable to use zinc acrylate since the resilience performance of the ball can be improved.
- the amount is preferably 10 to 40 parts by weight based on 100 parts by weight of the base rubber.
- the filler those usually blended in the core can be used, and for example, zinc oxide, barium sulfate, calcium carbonate and the like can be used.
- the compounding amount is preferably 2 to 50 parts by weight based on 100 parts by weight of the base rubber. Further, an antioxidant or a peptizer may be added as needed.
- a known elastomer can be used in addition to the rubber composition.
- the force par 3 is made of an elastomer, and is covered on the surface of the core 1 as shown in FIG. A predetermined dimple force S (not shown) is formed on the surface.
- a projection 9 that fits into the above-described groove 5 is formed on an inner wall surface of the force par 3 that is infested with the core 1.
- the protrusion 9 has the same cross-sectional shape as the groove 5, and extends along the above three great circles so as to be filled over the entire groove 7.
- the hardness of the force par 3 is preferably 55 to 65 in Shore D hardness. Further, the thickness of the force par 3 is preferably from 1.0 to 2.6 mm, more preferably from 1.6 to 2.3 mm. This is because when the thickness 3 of the force par 3 is smaller than 1.0 mm, the durability of the force par 3 is remarkably reduced and molding becomes difficult. Because it gets worse.
- the thickness of the force par 3 is defined as the distance from any radially outermost point where no dimples are formed to any point where the protrusion 9 is not formed and which is in contact with the core. It is a value measured along
- styrene-butadiene-styrene block copolymer SBS
- SIS styrene-isoprene-styrene block copolymer
- SEBS styrene-ethylene-butylene-styrene block copolymer
- SEPS styrene-ethylene-propylene-styrene block copolymer
- Lastmer a thermoplastic thermoplastic elastomer with a hard segment of polyethylene or polypropylene and a soft segment of butadiene rubber or ethylene / propylene rubber
- a hard segment with crystalline polyvinyl chloride as a hard segment amorphous, polyvinyl chloride or acrylonitrile resin.
- a method for manufacturing the golf ball configured as described above will be described.
- a first coating (not shown) having an inner wall surface corresponding to the outer peripheral surface of the core 1 is prepared.
- the first growth smoke can be divided into a plurality of portions so that the core 1 can be removed from the mold without catching the groove 5.
- this mold is filled with the above-described core material, and compression-molded at about 140 to 170 ° C. for 5 to 30 minutes.
- the core can also be formed by injection molding.
- the core 1 molded as described above is placed in a second molding die, and the cover 3 is covered with a known injection molding method.
- the force par 3 can be formed by wrapping the core with a pair of force par materials previously formed in a hemispherical grain shape and compression-molding the core.
- the protrusions 9 formed on the inner surface of the force par 3 are fitted to the grooves 5 formed on the surface of the core 1, so that the cover 3 and the core 1 Adhesion is improved, and it becomes difficult for slip force to occur between the two when hitting. As a result, loss of energy transmitted from the cover 3 to the core 1 at the time of impact can be reduced, so that resilience performance can be improved.
- the groove 5 is not formed over the entire surface of the core 1, but the groove 5 and the protrusion 9 are fitted only at a portion along the great circle of the core 1. are doing.
- the grooves 5 and the projections 9 are provided on the entire spherical surface as in the conventional example, the force par 3 is so closely adhered to the core 1 that it is difficult to deform, so that the hit feeling is deteriorated
- the projections 9 are not formed, and the deformation of the power member is allowed to some extent in the region 7, it is possible to prevent the hit feeling from becoming hard. As a result, it is possible to combine high resilience with a soft feeling when hit.
- the depth D of the groove 5 is set as described above, but if the depth D is larger than 2 mm, the protrusion 9 is too tightly fitted into the groove 5 and is deformed. This is because ⁇ becomes harder as it becomes harder. On the other hand, if it is smaller than 1. O mm, the force par 3 is less likely to be displaced from the core 1, and the energy opening at the time of impact is increased, and the resilience performance is reduced.
- FIG. 3 is a cross-sectional view of the golf pole according to the present embodiment
- FIG. 4 is a front view (a) and a side view (b) of the core.
- the golf pole according to the present embodiment is a two-piece golf pole including a core 11 and a force par 13 covering the core.
- a groove 15 is formed on the surface of the core 11 of this golf pole, as in the first embodiment.
- each groove 15 extends along three great circles C drawn on the surface of the core 11 and orthogonal to each other, but may be formed over the entire length of the great circle C. Rather than being formed in part of it. That is, each of the grooves 15 is formed at a part of each of the arc portions between the intersection points P of the great circles C, and the grooves 15 are connected to each other.
- each groove 15 is formed as follows. This will be described with reference to FIGS.
- FIG. 5 and 6 are a cross-sectional view and a perspective view of the core for describing a method of forming a groove in the core.
- a pan B extending along the above three great circles C is virtually drawn on the surface of the core 11.
- Fig. 5 shows a band B drawn along one of the great circles C, and the three bands drawn in this way are partially cut away in Fig. 7 (a). This is shown in a perspective view.
- the band portion B is formed in a sector shape in cross section, and the circular arc portion B 1 coincides with the surface of the core 11. That is, the radius of curvature of the arc B 1 and the radius of the core 1 1 Are consistent.
- FIG. 7 (b) is an enlarged view of a portion where the band is cut off in FIG. 7 (a).
- each groove portion 15 is formed as shown in FIG. A boundary portion R1 between 15a and 15b and the adjacent inner wall surface is formed in an arc shape.
- the depth D of the groove is substantially the same as the radial height of the band B, and is preferably 1.0 to 2.0 mm for the same reason as in the first embodiment.
- the width W of the band portion B shown in FIG. 5 is preferably set to 3.8 to 8.5 mm in order to improve the resilience performance and the actual hit feeling as shown in the examples described later. More preferably, it is set to 7.0 to 8.0 mm.
- the band portion instead of defining the band portion B by the width W, the band portion may be defined by the fan-shaped apex angle ⁇ , and the apex angle ⁇ is preferably set to 90 to 150 degrees.
- the height of the band ⁇ that is, the depth D of the groove is set to 1.0 to 2.0 mm
- the circumferential length of the groove 15 is 12.4 to 17.3 mm.
- the diameter, material, and hardness of the core 11 are the same as those in the first embodiment, and therefore, detailed description is omitted.
- the groove portion 15 is formed by cutting out the band portion B by the plane S passing through the section B 2 of the fan-shaped cross section. This plane is formed by the center between the intersection points P of the great circle C. It need not necessarily pass through the top B 2 as long as it is perpendicular to the normal N of the core 11 through M. That is, as shown in FIG. 7 (b), the band portion is cut out on the plane S1 passing through the band portion B radially outward of the core 11 from the top portion B2 of the sectoral cross section. Thereby, the groove 15 can be formed.
- the shape of the groove 15 is such that, as shown in FIG.
- the boundary R1 between the pair of inner wall surfaces 15a and 15b and the adjacent inner wall surface is an arc shape
- FIG. The configuration is the same as that shown, except that a pair of inner walls 15a and 15b extending symmetrically in the left-right direction along the circumferential direction are formed with a space between the bottom ends. It is different from the configuration shown in FIG.
- the shank part 15 shown in FIG. 9 it is possible to mold using a two-sided split mold as in the case of the Tf shading part 15 shown in FIG. 8.
- the core can be molded by dividing the mold with L.
- the preferred depth and shape of the groove 15 shown in FIG. 9 are as described above for the groove 15 shown in FIG.
- the force par 13 is formed with the same layer thickness, material, and hardness as those of the first embodiment, and the inner wall surface thereof is fitted with the groove 15 as shown in FIG. Two protrusions 19 are formed.
- a core mold (not shown) for molding the core 11 is prepared.
- the core mold is formed such that its inner wall surface corresponds to the outer peripheral surface of the core 11. That is, 12 protrusions for forming the groove 15 of the core 11 are formed.
- the adult wing is composed of two types, upper and lower, and is divided into two. At this time, the dividing line between the upper mold and the lower mold is perpendicular to any one of the three great circles C as shown by a line L in FIGS. 4 (a) and 4 (b), for example. It is sufficient if both of the two great circles C are on a plane that intersects at an angle of 45 degrees.
- the upper mold and the lower mold are brought into contact with each other, and the core is molded by compression molding.
- the upper mold and the lower mold are separated, and the molded core is taken out from the inside.
- the protrusion of the molding die is formed in the shape as described above, the core can be easily removed without being caught by the core molding die.
- the taken out core is inserted into a molding die for force par molding, and the cover is covered by injection molding or compression molding as in the first embodiment.
- the protrusion 19 of the force par 13 is fitted into the groove 15 formed on the surface of the core 11, the same as in the first embodiment. , Power par 1 3 And the core 11 tightly adhere to each other, so that the resilience performance can be improved. Still, as described above, since the groove 15 is formed so that the core 11 can be formed by a mold that is divided into two parts, the productivity is improved, and the manufacturing time of the core 11 is reduced. This makes it possible to reduce the cost of the mold and the cost, and mass production of the core 11 can be realized at low cost.
- the groove 15 described above is not formed on the entire surface of the core 1 but is formed along the great circle C, as in the first embodiment. Therefore, in the portion other than the groove portion 15, the force par 3 and the core 1 are not tightly adhered, and a certain degree of deformation is allowed when hit. As a result, the feeling can be softened.
- the power s described in the embodiment of the present invention is not limited to each of the above embodiments, and various changes can be made without departing from the gist of the present invention.
- the cross-sectional shape of the groove in the first embodiment is, the shape may be another shape, such as an arc-shaped cross-section or a rectangular cross-section.
- the core may have a shape other than that of the second embodiment, and the surface forming the groove may be formed in a direction in which the upper die and the lower die separate from each other. The hem may expand radially outward as it approaches the force or the dividing line formed in the circle.
- Example 1 the golf pole of the second embodiment (Examples 1 to 15) is compared with a conventional gonolev Bonore without a groove (Comparative Example 1).
- Examples 1 to 15 and Comparative Example 1 are composed of the same components as shown in Table 1, and all have a ball diameter of 42.7 mm and a force bar thickness of 1.7 mm. [table 1 ]
- Table 2 shows the size of each golf ball.
- the shape of the groove is formed as shown in FIGS.
- Each Gosolev Benole was manufactured by press molding to have the above-mentioned components, amounts and dimensions.
- the hardness of the core in each golf pole is set to 50 Shore D hardness, and the hardness of the kano is set to 59 Shore D hardness.
- Example:! 9 show good flight distance (carry) and actual hit feeling.
- the flight distance was shorter than in Example 1-9, but this was due to the fact that the force par was likely to shift due to the shallow depth of the groove, which resulted in the resilience performance This is probably due to the decrease in
- the actual hit feeling was harder than in Examples 1 to 9, but this was because the groove was deep! This is considered to be because the force par and the core tend to firmly adhere to each other.
- Example 12 the flight distance was reduced as compared with Examples 1 to 9, but this was because the area of the fitting portion between the force par and the core was reduced due to the narrow width of the groove. It is considered that the force par tends to shift.
- Example 13 the actual hit feeling is harder than in Examples:! To 9, but this is due to the fact that the area of the fitting part between the force and the core is increased due to the wide width of the groove. This is considered to be due to V ⁇ becoming wider and the movable range of the force par being easily restricted.
- Example 14 the flight distance was shorter than in Examples 1 to 9, but this was because the width of the groove became narrower because the apex angle ⁇ of the sector was small. Probably for the same reason.
- Example 15 the actual hit feeling was harder than in Examples 1 to 9, but this was because the apex angle CK was large and the width of the groove was large. Probably for the same reason.
- each of the above-described embodiments has a long distance, a flight distance, and good filling, and is superior to the comparative example.
- FIG. 10 is a cross-sectional view showing a golf pole according to the present embodiment.
- the golf ball of the present embodiment includes a spherical core 21 having a groove 25 formed on the surface thereof, and a cover 23 covering the core 21, similarly to the golf balls of the above embodiments.
- a projection 29 fitted into the groove 25 is formed on the inner surface of the force member 23.
- the golf ball of this embodiment has the same diameter and appearance as the golf ball of the second embodiment, and is characterized in that the core 21 has a two-layer structure.
- the core 21 includes a spherical main body 2 11 and an intermediate layer 2 12 covering the surface of the main body 2 1 1, and the spherical intermediate layer 2 1 2
- a groove 25 is provided on the surface of the.
- the grooves 25 have the same shape as the grooves 15 of the second embodiment shown in FIG. 3, and are arranged 12 like the grooves 15 of the second embodiment.
- the material and hardness of the main body portion 211 those exemplified as the material and hardness of the core 1 in the first embodiment can be preferably used.
- the material and hardness of the force pars 23 those exemplified as the material range of the cover 1 in the first embodiment can be preferably used.
- the thickness of the cover 23 is the same as that of the force par 1 of the first embodiment.
- the mid layer 2 12 is composed of a rubber composition or an elastomer. When it is made of a rubber composition, the same material as that of the core 21 can be used, and for the material of the elastomer, the same material as that of the force par 23 can be used.
- the thickness of the intermediate layer 21 is substantially equal to the depth of the groove 25, and is preferably 1.0 to 2.0 mm as shown by V in the first embodiment, More preferably, it is 1.5 to 1.8 mm.
- the core 21 is formed by fitting the groove 25 formed in the core 21 with the protrusion 29 formed on the inner peripheral surface of the cover 23. This improves the adhesion between the cover 23 and the cover 23, and reduces the amount of energy transmitted to the core 21 from the force par 23 at the time of impact, thereby improving the repulsion performance.
- the core 21 has the two-layer structure of the main body portion 211 and the intermediate layer 211 as described above, the hardness of the main body portion 211 and the intermediate layer 212 is appropriately set. According to various conditions, such as head speed, high resilience and raw and soft feeling can be easily combined. For example, by making the hardness of the mid layer 2 12 higher than the hardness of the main body 2 11 and making the hardness of the force par 23 lower than that of the mid layer 2 12, the resilience performance of the mid layer 2 12 The feeling can be improved by the cover 23 while maintaining a good flight distance and improving the flight distance.
- the hardness of the intermediate layer 2 12 is lower than the hardness of the main body 2 11, and the hardness of the cover 23 is higher than that of the intermediate layer 2 1 2, so that the main body 2 1 1 and the cover 2 3 Thereby, while maintaining good resilience performance and improving the flight distance, the feeling can be improved by the intermediate layer 2 12.
- the core 21 since the core 21 has a two-layer structure, the degree of freedom in design can be increased, and desired characteristics can be easily obtained.
- the hardness of the main body 2 1 1, the middle layer 2 1 2 and the cover 2 3 can be set as appropriate.
- the main body 2 11 or the intermediate layer 2 12 is composed of a rubber composition:
- the hardness of ⁇ is increased by increasing the amount of unsaturated carboxylic acid and organic peroxide. it can.
- the rubber composition is pressed in a molding die (not shown), for example, at 130 to 130 ° C. for 5 to 25 minutes to form a spherical main body 2 11.
- the main body portion 211 may be made of an elastomer as described above. In this case, the main body portion 211 can be formed by injection molding in addition to press molding.
- FIG. 11 shows a state in which the main body 21 1 is arranged on the lower mold 40 of the core awakening.
- FIG. 11 (a) is a force law diagram
- FIG. 11 (b) is a diagram.
- the lower mold 40 has a hemispherical receiving portion 41, and a plurality of protrusions 42 for forming the groove portion 25 of the core 21 are formed by the receiving portion 4. 1 is formed on the inner wall surface.
- the upper mold of the core mold is not shown, it is configured similarly to the lower mold 40.
- each projection 4 2 contacts the surface of the main body 2 1 1 to support the main body 2 1 1 and receive the main body 2 1 1
- a gap S is formed between the inner wall surface of the part 41 and the inner wall surface. Thereafter, the gap S is filled with a material having a hardness different from that of the main body portion 211 to form a core 21 in which the main body portion 211 is covered with the intermediate layer 212. Grooves 25 are formed on the surface of the core 21 at positions corresponding to the respective protrusions 42.
- the core 21 that has been separated and taken out of the core mold is placed in a cover mold in the same manner as in the first and second embodiments, and the cover 23 is covered by injection molding or compression molding. Thereby, the groove 25 formed in the core 21 is fitted to the protrusion 29 of the force member 23.
- the golf ball of the present embodiment is completed.
- productivity can be improved.
- the core 21 having a two-layer structure with different hardnesses can be easily manufactured, and the eccentricity of the core 21 can be reliably prevented, so that the yield can be improved.
- the golf pole of the third embodiment (Examples 16 and 17) is compared with a conventional type golf pole without a groove (Comparative Examples 2 and 3).
- Examples 16 and 17 and Comparative Examples 2 and 3 have the same configuration except for the presence or absence of the groove, and have a body diameter of 39.3 mm and an intermediate layer thickness of 1. 7mm, force par thickness is 1.7mm.
- each of the grooves in Examples 16 and 17 had a depth of 1.7 mm, a width of 3.8 mm, a length of 16, Omm, and an apex angle ⁇ (see FIG. 5) with a force of 100 °.
- Example 16 and Comparative Examples 2 and 3 the hardness of the main body and the hardness of the intermediate layer were different.
- Example 16 and Comparative Example 2 are cases where the hardness of the intermediate layer is higher than the hardness of the main body portion and the hardness of the cover is lower than the hardness of the intermediate layer.
- Example 17 and Comparative Example 3 the hardness of the intermediate layer was lower than the hardness of the main body, and the hardness of the cover was higher than the hardness of the intermediate layer.
- Table 4 shows materials and hardnesses of the core, the intermediate layer and the cover in the examples and the comparative examples.
- Himilan is a registered trademark of Mitsui Dupont Polychemicals Co., Ltd.
- the hit test and the actual feel test were performed under the same conditions as in the example of the second embodiment. Table 7 shows the results.
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Abstract
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JP2005511439A JP4066001B2 (ja) | 2003-07-08 | 2004-07-06 | ゴルフボール及びその製造方法 |
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PCT/JP2004/009893 WO2005002681A1 (ja) | 2003-07-08 | 2004-07-06 | ゴルフボール及びその製造方法 |
Country Status (4)
Country | Link |
---|---|
US (1) | US7041010B2 (ja) |
JP (1) | JP4066001B2 (ja) |
TW (1) | TW200507908A (ja) |
WO (1) | WO2005002681A1 (ja) |
Cited By (1)
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JP2010522014A (ja) * | 2007-03-21 | 2010-07-01 | ダータ エフ.ソシエタ ア レスポンサビリタ リミタータ | 色付き遊技用ボール |
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US6004225A (en) * | 1997-01-21 | 1999-12-21 | Owens; Timothy M. | Golf ball |
US20070161434A1 (en) * | 2005-06-03 | 2007-07-12 | Dufaux Douglas | Golf ball |
US20080057332A1 (en) * | 2006-06-26 | 2008-03-06 | Nanodynamics, Inc. | Methods for making hollow metal spheres |
US8568250B2 (en) * | 2010-07-07 | 2013-10-29 | Nike, Inc. | Golf ball with cover having zones of hardness |
US10155137B2 (en) | 2013-07-05 | 2018-12-18 | Feng Tay Enterprises Co., Ltd | Golf ball core |
US20150007932A1 (en) * | 2013-07-05 | 2015-01-08 | Nike, Inc. | Method of manufacturing a multi-layer golf ball |
US9573023B2 (en) | 2013-07-05 | 2017-02-21 | Nike, Inc. | Multi-layer golf ball |
US20150007931A1 (en) * | 2013-07-05 | 2015-01-08 | Nike, Inc. | Method of manufacturing a multi-layer golf ball |
US9586096B2 (en) | 2013-07-05 | 2017-03-07 | Nike, Inc. | Multi-layer golf ball |
US9468814B2 (en) | 2013-07-05 | 2016-10-18 | Nike, Inc. | Multi-layer golf ball |
US9492716B2 (en) | 2013-07-05 | 2016-11-15 | Nike, Inc. | Multi-layer golf ball |
US9283440B2 (en) | 2013-11-08 | 2016-03-15 | Nike, Inc. | Multi-layer golf ball |
US9289656B2 (en) | 2013-11-21 | 2016-03-22 | Nike, Inc. | Multi-layer golf ball |
JP6239405B2 (ja) * | 2014-02-25 | 2017-11-29 | 美津濃株式会社 | ゴルフボール |
US9675847B2 (en) * | 2014-11-21 | 2017-06-13 | One World Play Project LLC | Sports ball and method of manufacture |
US20200197750A1 (en) * | 2018-12-20 | 2020-06-25 | Acushnet Company | Minimal surface golf ball components |
Citations (3)
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JPS49136364U (ja) * | 1973-03-22 | 1974-11-22 | ||
JPS62270178A (ja) * | 1986-05-20 | 1987-11-24 | ヤマハ株式会社 | ゴルフボ−ルおよびその製法 |
JP2003024472A (ja) * | 2001-07-11 | 2003-01-28 | Shigenori Yoshikawa | マルチピースゴルフボール及びその製造方法 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US698516A (en) | 1902-03-26 | 1902-04-29 | Kempshall Mfg Co | Playing-ball. |
US4173345A (en) | 1978-06-26 | 1979-11-06 | Colgate-Palmolive Company | Golf ball |
US4229401A (en) | 1979-05-29 | 1980-10-21 | Colgate-Palmolive Company | Method of making golf balls |
JP3453024B2 (ja) * | 1996-04-24 | 2003-10-06 | ブリヂストンスポーツ株式会社 | ゴルフボール |
JP3930934B2 (ja) * | 1997-02-03 | 2007-06-13 | Sriスポーツ株式会社 | ソリッドゴルフボール |
US5984807A (en) | 1998-08-20 | 1999-11-16 | Callaway Golf Company | Golf ball |
US6743123B2 (en) * | 2001-03-23 | 2004-06-01 | Acushnet Company | Golf ball having a high moment of inertia and low driver spin rate |
-
2004
- 2004-07-06 JP JP2005511439A patent/JP4066001B2/ja not_active Expired - Fee Related
- 2004-07-06 WO PCT/JP2004/009893 patent/WO2005002681A1/ja active Application Filing
- 2004-07-07 TW TW093120333A patent/TW200507908A/zh not_active IP Right Cessation
- 2004-07-07 US US10/885,043 patent/US7041010B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS49136364U (ja) * | 1973-03-22 | 1974-11-22 | ||
JPS62270178A (ja) * | 1986-05-20 | 1987-11-24 | ヤマハ株式会社 | ゴルフボ−ルおよびその製法 |
JP2003024472A (ja) * | 2001-07-11 | 2003-01-28 | Shigenori Yoshikawa | マルチピースゴルフボール及びその製造方法 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010522014A (ja) * | 2007-03-21 | 2010-07-01 | ダータ エフ.ソシエタ ア レスポンサビリタ リミタータ | 色付き遊技用ボール |
Also Published As
Publication number | Publication date |
---|---|
JPWO2005002681A1 (ja) | 2006-08-10 |
US20050037867A1 (en) | 2005-02-17 |
TW200507908A (en) | 2005-03-01 |
TWI335828B (ja) | 2011-01-11 |
US7041010B2 (en) | 2006-05-09 |
JP4066001B2 (ja) | 2008-03-26 |
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