JP3046808B1 - Flat park golf ball and manufacturing method thereof - Google Patents

Abstract

Kind Code: A1 A flat park golf can be played on slippery floors such as indoor and outdoor wooden floors, tile floors, concrete floors, etc., and it is easy to handle by hand. Provided is a seamless flat golf ball having a feeling of impact and a method of manufacturing the same. Kind Code: A1 A spherical core ball portion made of nylon resin or rubber, a coating portion of a mixture of a pigment and rubber and enclosing the core ball portion and having no seam, and the same material as the coating portion. A projection group 3 having a plurality of projections sparsely arranged on the outer surface of the coating section 2, a mark coating section 4 as a coating section for a mark portion, and a mark projection group 5 as a projection group for a mark section are provided. About 1.4
Features formed between about 5 and 1.5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method of manufacturing a flat park golf ball for playing flat park golf on indoor and outdoor wooden floors, tile floors, concrete floors, and the like. And a flat park golf ball manufactured by the method.

[0002]

2. Description of the Related Art Conventionally, golf has been provided with green, fairways, and roughs covered with vents, koyo, wild grass, and the like, as well as cups, grass, trees, sand (bunkers), and ponds. And the like are arranged on a large-scale golf course that is arranged according to the degree of difficulty. Therefore, the player has to go to a golf course having a golf course and pay a large fee to play golf.

[0003] In addition, since golf courses are outdoor courses, in particular, natural phenomena such as bad weather such as rain, snow, wind and lightning, cold seasons such as winter, and cold regions, On the other hand, in the case of direct sunlight, in the case of a hot season such as summer, or in the case of a hot region, it becomes severe play,
There was a drawback that it was not possible to play in the event of a storm or snow.

[0004] Further, since the course itself is long distance and rugged, the amount of movement required for movement is large, and a two-seater or four-seater self-propelled cart must be used to reduce the amount of movement during movement. Also, when hitting a flying ball,
To hit a golf ball, which is a small-diameter hard ball, with the wood or iron club selected each time according to the flight distance, it is necessary to prepare a large number of wood clubs, iron clubs and putters, and it is expensive to prepare one set I have to be.

Further, since a golf ball hit with a wood or a long iron has a long flight distance, the hit golf ball tends to be lost if it is not properly inspected. The burden on the aspect is large.

[0006] The above-mentioned drawbacks particularly hinder children and the elderly from playing, and the current golf population is small for children and the elderly.

[0007] In order to solve such a problem,
There is putter golf. The putter golf involves playing around the putter golf course using only golf balls and putters on an outdoor or indoor putter golf course, which is a green course mainly covered with artificial turf.

[0008] The putter golf can be played outdoors and indoors, and since the putter golf course itself is small, the amount of movement during the movement is small, and all the golf balls are hit by rolling with the putter, so that the risk is low. The possibility of losing the golf ball is low. Therefore, it is widely played by children, the elderly and the like.

However, putter golf, as described above,
There is a problem in that it lacks the real pleasure of golf, and must be performed on a narrow putter golf course covered with artificial turf and the like because a golf ball is used.

Further, the weight of the golf ball is very light, and the golf ball does not feel much hitting. In addition, since the golf ball has a small diameter and a light weight, it is difficult to control the hit ball and is difficult to handle.

[0011]

As a sport that solves the drawbacks of putter golf balls, park golf smaller than golf has been developed. Park golf is a sport that is played outdoors on a park golf course on which the ground, logs and the like are mainly covered with grass.

Basically, on a park golf course, a player hits a plastic park golf ball having a diameter of 6 [cm] using one park golf stick which is a club dedicated to park golf. Then, the player competes to put the ball for outdoor park golf into the cup with a small number of hits.

The park golf course has, for example, a total of nine courses in the same manner as the golf half-course, with two short holes having a prescribed number of hits of two, two long holes having a prescribed number of strokes of two, and a prescribed number of hits. Are arranged so that there are five middle holes with four strokes.

However, to play park golf,
The park golf course has a problem that it is necessary to go to a park golf course created outdoors as in the case of the putter golf.

There are park golf balls for outdoor use but not for indoor use.

When playing on a flat surface such as a wooden floor in an indoor gym or the like using an outdoor park golf ball, artificial turf or the like must be spread. The reason is that the ball for outdoor park golf has a low rotational friction resistance on the wooden floor and the roller is too accelerated, so that the ball is rolled too much. This is because a timid striking motion such as touching a swollen object is performed as compared with the striking motion, and a good striking sensation cannot be obtained and the sport lacks interest.

Therefore, in order to spread a mat or the like such as artificial turf on a flat surface such as a wooden floor or the like, there is a large burden in terms of time, labor and cost, and it is necessary to play outdoors.

Therefore, in the case of bad weather such as rain, snow, wind, and lightning, in the case of a cold season such as winter, in the case of a cold region, or conversely,
When direct sunlight is strong, in a hot season such as summer, or in a hot region, there is a problem that severe play is caused.

In addition, even when playing outdoors, when playing on asphalt, tiles, or concrete flat surfaces outdoors, etc., the ball for outdoor park golf is still too rolled.
Made it difficult to play.

Also, since the outside park golf ball has a larger outer diameter than the golf ball, it is easier to handle than the golf ball. However, the outdoor park golf ball is made of plastic, and the friction between the hand and the handling hand is reduced. There was a problem that it was slippery and difficult to handle because of its increased weight in that it was small.

As for the gate ball, a gate ball indoor sphere has already been considered, and the gate ball indoor sphere has a large outer diameter of about 7.5 [cm] and a smaller specific gravity. When the same material is applied to the ball, the weight is reduced, and similarly, there is a problem that the ball rolls too much and a good hit feeling cannot be obtained when hitting.

Here, the main objects to be solved by the present invention are as follows.

A first object of the present invention is to provide a flat park golf ball which does not roll too much on slippery floors indoors and outdoors, and a method of manufacturing the same.

A second object of the present invention is to provide a flat park golf ball which is easy to handle by hand and a method of manufacturing the same.

A third object of the present invention is to provide a flat park golf ball capable of obtaining a good rolling distance and a feeling of impact when hitting, and a method for manufacturing the same.

[0026] Other objects of the present invention are as follows:
In particular, it will be obvious from the description of each claim in the claims.

[0027]

In order to solve the above-mentioned problems, a ball according to the present invention comprises a spherical core sphere serving as a core, a coating covering the core sphere, a columnar shape, a conical shape, and a needle shape. And a projection group arranged on the outer surface of the covering portion with a projection having any shape among the projections and generating a frictional resistance with a flat surface.

The method of the present invention solves the above problems.
A spherical core ball portion, a covering material and a compounding material that is a material of the protrusion group on the outer surface of the covering portion, and an upper and lower half mold are prepared, and the compounding material is filled in the entire upper and lower half mold. Then, the core ball portion is disposed so as to be sandwiched by the upper and lower half molds, the upper and lower half molds are sealed, high pressure is applied, and the entire ball surface of the core ball portion is wrapped with the compounding material. By vulcanizing, after forming the coating portion, the column group, the conical shape, the projection group that is formed of any one of the projections of needle shape and generates a frictional resistance with the flat surface, Take a characteristic construction method of taking out from both upper and lower halves and quenching.

More specifically, in solving the above-mentioned problems, the present invention achieves the above object by adopting new characteristic constitution means or techniques ranging from a superordinate concept to a subordinate concept as listed below. Is done.

That is, the first feature of the method of the present invention is that, when manufacturing a flat park golf ball having a coating portion and a projection group on the outer surface of the coating portion and having no seams, a spherical core ball portion, A covering material and a compounding material that is a material of the projection group, and an upper and lower half mold for molding the flat park golf ball are prepared, and the compounding material is filled into the entire upper and lower half molds. The core ball portion is arranged so as to be sandwiched by the upper and lower half molds, the upper and lower half molds are sealed, high pressure is applied to the upper and lower half molds, and the entire ball surface of the core ball portion is mixed with the mixture. By wrapping with a material, the upper and lower halves are heated at the vulcanization temperature of the compounding material and vulcanized, so that the coating portion, a columnar shape, a conical shape, and a needle-like shape are formed. The projections, which are composed of projections and generate frictional resistance with a flat surface, are formed and formed. After taking out a flat Park golf balls finished to a predetermined specific gravity from the upper and lower mold halves,
The present invention resides in adopting a configuration of a flat park golf ball manufacturing method in which a shrinkage treatment is performed by rapidly cooling the coating portion, and finally, a deburring treatment is performed.

A second feature of the method of the present invention is that the joint has a covering portion, a group of protrusions on the outer surface of the covering portion, a mark covering portion as a mark portion, and a group of mark protrusions on the outer surface of the mark covering portion. In manufacturing a flat park golf ball without any defects, a spherical core ball portion, a first compounding material that is a material of the covering portion and the projection group, and a material of the mark covering portion and the mark projection group. A second compounding material and an upper and lower half mold for molding a flat park golf ball having the mark portion are prepared, and the second compounding material is filled into the molding portions of the mark portions of the upper and lower half molds. And then the first
Is filled in the whole of the upper and lower half molds, the core ball portion is arranged so as to be sandwiched by the upper and lower half molds, the upper and lower half molds are sealed, and the upper and lower half molds are sealed. High pressure to wrap the entire ball surface of the core ball portion with the first compounding material, and divide the upper and lower half molds at the vulcanization temperature of the first compounding material and the second compounding material. By heating and vulcanizing, the protrusions are formed of any one of a cylindrical shape, a conical shape, and a needle shape, and the protrusions which generate frictional resistance with a flat surface are formed. Forming a group and the mark projection group, and then taking out a flat park golf ball finished to a predetermined specific gravity from the upper and lower half molds, and shrinking the coating portion and the mark coating portion by quenching. Finally, a flat park golf made by deburring In the configuration adoption of the ball manufacturing method.

A third feature of the method of the present invention is that the high pressure in the first or second feature of the method of the present invention is about 15
The specific gravity of the core ball portion ranges from about 1.45 to about 0t.
The configuration of the method for manufacturing a flat park golf ball having a length of about 1.5 is adopted.

A fourth feature of the method of the present invention is that the vulcanization treatment according to the first, second or third feature of the method of the present invention is characterized in that the vulcanization treatment is performed at a predetermined vulcanization temperature of about 145 ° C. to about 150 ° C. The present invention is to adopt a configuration of a flat park golf ball manufacturing method which is a low-temperature heating vulcanization treatment.

A fifth feature of the method of the present invention is that the core sphere in the first, second, third or fourth feature of the method of the present invention has a heat resistant temperature of about 150 ° C. to 180 ° C. respectively. A flat park golf ball manufacturing method comprising one or a combination of a resin having a low shock absorption and a high resilience, and an elastic material having a super shock absorption and a super low resilience is employed.

According to a sixth aspect of the method of the present invention, there is provided a method of manufacturing a flat park golf ball, wherein the resin in the fifth aspect of the present invention includes a nylon resin and the elastic material includes a rubber. Configuration adoption.

A seventh feature of the method of the present invention is that the compounding material in the first, third, fourth, fifth or sixth feature of the method of the present invention is a material in which a pigment and an elastic material are mixed. The present invention resides in the configuration of a method for manufacturing a flat park golf ball.

An eighth feature of the method of the present invention is that the elastic material of the compounding material in the seventh feature of the method of the present invention is for a flat park golf in which at least one or a combination of natural rubber and synthetic rubber is used. It is in the configuration adoption of the ball manufacturing method.

A ninth feature of the method of the present invention is that the first compounding material in the second, third, fourth, fifth or sixth feature of the method of the present invention is a compound of a pigment and an elastic material. The method for manufacturing a flat park golf ball, wherein the material is at least one color in which the second compounding material is different from the first compounding material in vulcanization conditions and contains a pigment and an elastic material. In the configuration adoption.

A tenth feature of the method of the present invention is that the elastic material of the first compounded material and the second compounded material in the ninth feature of the method of the present invention is one of natural rubber and synthetic rubber. One or a combination of the methods for manufacturing a flat park golf ball.

The first feature of the ball of the present invention is that it is a ball for flat park golf, and has a spherical core ball portion serving as a core.
A coating group that covers the core ball portion, and a projection group that is formed on the outer surface of the coating portion by a projection having any one of a columnar shape, a conical shape, and a needle shape and generates frictional resistance with a flat surface. And a configuration of a flat park golf ball having:

A second feature of the ball according to the present invention is that the ball according to the first feature of the ball according to the present invention also has a mark portion for identifying a player, and the mark portion is a covering portion of the mark portion. The present invention resides in the adoption of a flat park golf ball constituted by a mark covering portion and a mark projection group which is the same as the projection group and is a projection group of a mark portion.

A third feature of the ball of the present invention is that the core sphere portion in the first or second feature of the above-mentioned ball of the present invention has a low shock absorbing property at a heat-resistant temperature of about 150 to 180 ° C. and rebounds. Another object of the present invention is to adopt a configuration of a flat park golf ball, which is a material having at least one of a high-resinity resin and an elastic material having a super shock absorbing property and a super low resilience.

A fourth feature of the ball of the present invention is that the resin in the third feature of the above-described ball of the present invention includes a nylon resin, and the elastic material includes a rubber. In hiring.

A fifth feature of the ball of the present invention is that the cover and the protrusion in the first, second, third or fourth feature of the above-mentioned ball of the present invention are made of a material containing a pigment and an elastic material. The configuration of the flat park golf ball is adopted.

A sixth feature of the ball according to the present invention is that the elastic material in the material of the covering portion and the protrusion in the fifth feature of the ball according to the present invention is one or a combination of natural rubber and synthetic rubber. The present invention resides in the adoption of a flat park golf ball comprising:

A seventh feature of the ball of the present invention is that the mark covering portion and the mark projection group in the second, third, fourth, fifth or sixth feature of the present invention ball are a pigment and an elastic material. , And is in the configuration of a flat park golf ball of at least one color.

According to an eighth feature of the ball of the present invention, the elastic material in the material of the mark covering portion and the mark protrusion in the seventh feature of the ball of the present invention is one of natural rubber and synthetic rubber. Alternatively, the present invention resides in adopting a configuration of a flat park golf ball composed of a combination.

A ninth feature of the ball of the present invention is that the specific gravity of the core sphere portion in the first, second, third, fourth, fifth, sixth, seventh or eighth feature of the above-described ball of the present invention. But about 1.45
The present invention lies in adopting a configuration of a flat park golf ball having a distance between about 1.5 and about 1.5.

[0049]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an example of a ball and an example of a manufacturing method according to an embodiment of the present invention will be described in order with reference to the accompanying drawings.

(Example of Ball) An example of this ball will be described with reference to FIGS. FIG.
1 is a front view of a flat park golf ball as an example of the present ball, and FIG. 2 is a cross-sectional view taken along line II-II in FIG.

The flat park golf ball α has a spherical core ball portion 1 disposed at the center, a seamless coating portion 2 wrapped around the core ball portion 1, and an outer surface of the coating portion 2. It has a projection group 3 having a plurality of projections sparsely arranged.

Usually, in order to distinguish the flat park golf balls α between the players, the flat park golf balls α of different colors are used between the players. However, if the color of the flat park golf ball α between the players is the same or similar, there is a possibility that it becomes impossible to distinguish who the flat park golf ball α is during play. Etc. may be inserted.

Therefore, when a mark is to be made, the flat park golf ball α has a mark covering portion 4 which is a covering portion of the mark portion, and a mark protrusion group 5 which is a protrusion group of the mark portion.

The size of the flat park golf ball α excluding the projections 3 and the mark projections 5 is 6 cm in outer diameter.
It is. This is a standard for outdoor balls. But,
Indoor standards have not yet been determined and are not limited to this.

The core ball portion 1 is made of nylon resin or rubber. In the case of nylon resin, the impact absorption is low and the resilience is high, so the hardness is large and hard spheres, and in the case of rubber, the rubber has super shock absorption and ultra low resilience, so the hardness is small. Become a soft sphere. Both have a specific gravity of 1.4.
It is about 5 to 1.5. For example, since the core ball portion of the large-diameter gate ball indoor ball has a specific gravity of about 1.1, the specific gravity is larger than the gate ball indoor ball.

Since the flat park golf ball α has a smaller diameter than the gate ball indoor ball, when the specific gravity is the same, the weight of the flat park golf ball α is smaller, so that a good rolling distance is obtained. This will increase the specific gravity because it will no longer provide a feeling of impact. The numerical value of the specific gravity described here is not limited to this, but has a weight that can obtain a good rolling distance and a hit feeling when hitting the flat park golf ball α according to the size of the flat park golf ball α. You may choose as follows.

When the core ball portion 1 is made of a nylon resin, it has a low shock absorbing property and a high resilience, so that it has a characteristic that the hitting sound at the time of hitting is large. And, since it has ultra-low resilience, the resilience is small and the hitting sound is small.

Therefore, depending on whether the core ball portion 1 is made of nylon resin or rubber, for example, the difference in how to hit men and women, the difference in how to hit children, young people, middle-aged and elderly people, and the hitting sound Depending on the preference, each individual can use it according to his / her preference, including the impact and ease of control.

The plurality of projections of the projection group 3 and the mark projection group 5 have a columnar shape in FIG. 1, but are not limited thereto, and may have a conical shape, a needle shape, a combination thereof, or the like.

When the flat park golf ball α is rolled, the protruding group 3 and the mark protruding group 5 have a rolling energy due to the elastic deformation of the protruding group 3 and the mark protruding group 5 without having to lay artificial turf or the like on the floor. To provide a braking force to the flat park golf ball α and increase the frictional force with the floor surface. Therefore, as compared with the case where the projection group 3 and the mark projection group 5 are not provided, even if the same impact is applied, the stopping distance until stopping is shortened, the impact can be performed with a certain amount of force, and a good impact feeling can be obtained. can get.

Therefore, it is possible to play even on slippery floors such as wooden floors, tile floors and concrete floors indoors and outdoors without paving with artificial grass mats or the like. Disappears. In the flat park golf course, the position of the first hit is determined, obstacles and cups are arranged, and in some cases, penalty zones such as valleys, streams, ponds, and OBs are drawn on the floor with white ink etc. each time. It can be easily made.

In particular, playing indoors in a closed room is performed in bad weather such as rain or snow, in a cold season such as winter, in a cold region, or conversely, when direct sunlight is strong, or in a hot season such as summer. In such a case, even in a hot region, it is possible to play with air conditioning such as cooling and heating without any problem.

The material of the covering portion 2 and the group of projections 3 is a mixture of pigment and rubber. The material of the mark covering portion 4 and the mark protrusion group 5 is a mixture of pigments and rubbers different in color from the covering portion 2 and the protrusion group 3. Of course, the mark portion may use a plurality of colors, and in that case, a pigment of the same color as the covering portion 2 and the protrusion group 3 may be used. Also,
The rubber is, for example, a rubber obtained by blending a natural rubber and a synthetic rubber, but is not limited to this, and may be either a natural rubber or a synthetic rubber, or another elastic material.

When the core ball portion 1 is made of nylon resin,
The surface hardness of the core ball portion 1 increases, the pressing force on the projection group 3 and the mark projection group 5 at the time of hitting also increases, and the projection group 3 and the mark projection group 5 wear out quickly, and the core ball portion 1 is made of rubber. In the case of, the surface of the core ball portion 1 is also elastically deformed at the time of impact, so that the pressure on the projection group 3 and the mark projection group 5 is reduced, and
And the consumption of the mark projection group 5 becomes slow. In this regard,
For example, a rental company of flat park golf equipment can use a flat park golf ball α having a rubber core ball portion 1 with little wear.

However, the core ball portion 1 is made of a nylon resin having a low impact absorption and a high resilience, or a rubber made of a super shock absorbing and an ultra low resilience, but is not limited thereto. You may use the compound of resin and rubber | gum, the resin of low impact absorption and high repulsion, the elastic material of super shock absorption and ultra low repulsion, or these compound etc.

Further, the projections 3 and the mark projections 5 increase the frictional force with the hand to be handled, reduce the possibility of dropping on the floor or the foot, and facilitate handling by hand. In particular, when held with bare hands, it stimulates the acupuncture point of the hand, giving a very good grip.

(Example of Manufacturing Method) This example of manufacturing method is an example of a manufacturing method applied to the above-described ball example, and will be described with reference to FIGS.

First, a manufacturing method in which no mark is formed on the flat park golf ball α will be described.

First, in both the case of nylon resin and rubber, the heat-resistant temperature is, for example, about 150 to 180 ° C.
A core ball portion 1 already formed into a sphere shape, a compounding material containing a pigment and rubber and having a vulcanization temperature of, for example, about 145 to 150 [° C.], and a not shown for forming a flat park golf ball α. Prepare both upper and lower halves. The core ball 1 is
It is made of nylon resin with high shock absorption and low resilience or rubber made of super shock absorption and ultra low resilience, but is not limited to this, a compound of nylon resin and rubber, and other, A resin having a low impact absorption and a high resilience, a super shock absorbing and an ultra low resilience elastic material, or a blend thereof may be used.

The heat-resistant temperature and the vulcanization temperature depend on the materials of the core ball portion 1, the coating portion 2, and the projection group 3, and are not limited to the above-mentioned numerical values of the heat-resistant temperature and the vulcanization temperature. Further, the rubber of the compounding material is, for example, natural rubber and partially synthetic rubber, but is not limited to this, either natural rubber, synthetic rubber, any other elastic material,
Alternatively, these compounds may be used.

Next, the compounding material is filled in the upper and lower half molds, and the core ball portion 1 is disposed so as to be sandwiched between the upper and lower molds. After sealing together, a high pressure of, for example, about 150 [t] is applied to the upper and lower half molds, and the core material portion 1 is wrapped over the entire surface of the sphere with the compounding material.

Next, at the same time as or immediately after the core ball portion 1 is wrapped with the compounding material, the upper and lower halves are heated at the vulcanization temperature and subjected to a low-temperature heat vulcanization for a predetermined short time.
This predetermined short-time low-temperature heating vulcanization treatment does not dissolve the core ball portion 1 when the heat-resistant temperature and the vulcanization temperature are the above values, since the heat-resistant temperature and the vulcanization temperature are close to each other. That's why. Therefore, if the heating is stopped and the vulcanization process is completed, the core ball portion 1 holds and solidifies the true sphere, and simultaneously forms the coating portion 2 and the projection group 3 on the core ball portion 1.

When the vulcanization temperature is higher than the heat-resistant temperature, the surface of the core ball portion 1 is melted by performing low-temperature heating vulcanization for a predetermined short time. If the vulcanization treatment is completed by stopping the heating while being enclosed inside the compounded material in the vulcanized state and not leaving the outside, and holding it inside as it is, the core ball portion 1 does not become distorted and retains the true sphere and solidifies. At the same time, the covering portion 2 and the projection group 3 are formed on the core ball portion 1.

Thereafter, the upper and lower mold halves are opened, quenched by taking out water and the like, quenched, the coating 2 is shrunk, the coating 2 is brought into close contact with the core ball 1 and solidified. A deburring process is performed to remove burrs, which are material portions protruding from the upper and lower half molds of the golf ball α. Thus, a seamless flat park golf ball α having a hardness of about 50 to 60 ° is formed.

Second, a description will be given of a manufacturing method in which a mark such as a numeral is formed on the flat park golf ball α.

First, the above-mentioned compounding material is used as a first compounding material, and the core ball portion 1, the first compounding material, and a pigment and rubber different in color from the first compounding material are compounded. A second compounding material having different conditions during vulcanization and an upper and lower half mold having a mark forming portion (not shown) are prepared. First
The compounding material and the rubber of the second compounding material are, for example, composed of natural rubber and partially synthetic rubber, but are not limited thereto, either natural rubber or synthetic rubber, any other elastic material, or any of these. It may be a compound or the like.

The upper and lower half-shaped mark forming portions having the mark forming portion are filled with the second compounding material, and thereafter the first compounding material is replaced with the mark by the same procedure as when no mark is formed. The filling and core sphere portion 1 is disposed over the entire upper and lower half molds having the molded part, the upper and lower mold half having the mark molded part is sealed, and pressure is applied to the upper and lower half molds having the mark molded part. The split mold is heated to the vulcanization temperature and subjected to a low-temperature heat vulcanization treatment for a predetermined short time to form the coating portion 2, the projection group 3, the mark coating portion 4, and the mark projection group 5, and the upper and lower portions having the mark forming portion later. The flat park golf ball α is taken out from both half molds, quenched, subjected to a shrinkage treatment, subjected to a deburring treatment, and has a seamless portion having a coating portion 2, a projection group 3, a mark coating portion 4, and a mark projection group 5. Of flat park golf ball α
Is molded.

Of course, the mark portion formed by the mark covering portion 4 and the mark protrusion group 5 is not limited to one color, but may be a plurality of colors. In this case, the second compounding material may be used by the number of colors, and the same color as the first compounding material may be used.

According to the example of the present manufacturing method, the shrink coating process is applied to the core ball portion 1 regardless of whether the mark is to be inserted or not. There is no space between them, and there is no sliding displacement between them.

Although the embodiments of the present invention have been described above, the present invention is not necessarily limited to the above-described means and methods, but achieves the object of the present invention and achieves the effects of the present invention. Changes can be made as appropriate within the scope of the above.

[0081]

As described above, according to the present invention,
Flat park golf can be played on slippery floors such as wooden floors, tile floors, concrete floors and the like regardless of whether indoors or outdoors, without laying artificial grass or the like. Further, a desired rolling distance can be obtained by applying a certain degree of adjustment hit to the flat park golf ball, and a good hit feeling can be obtained.

The flat park golf ball according to the present invention is easy to handle by hand. Also, the difference in how to hit,
The type of flat park golf ball can be freely selected according to the preference of the hitting sound. Also, by selecting the addition of a mark, a seamless flat park golf ball can be manufactured.

[Brief description of the drawings]

FIG. 1 is a front view of a flat park golf ball according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG.

[Explanation of symbols]

 α: Flat park golf ball 1… Core ball portion 2… Coating portion 3… Protrusion group 4… Mark covering portion 5… Mark projection group

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁷ identification code FI // B29K 21:00 77:00 B29L 31:54 (58) Field surveyed (Int.Cl. ⁷ , DB name) A63B 37 / 00 A63B 37/12 A63B 69/36

Claims (19)

(57) [Claims] In producing a seamless flat park golf ball having a projection and a projection group on an outer surface of the coating section and the coating section, a spherical core ball section and materials of the coating section and the projection group. A compounding material and an upper and lower half mold for molding the flat park golf ball are prepared, and the compounding material is filled into the entire upper and lower half mold, and the mixture is sandwiched between the upper and lower half molds. A core ball portion is arranged, the upper and lower half molds are sealed, high pressure is applied to the upper and lower half molds, and the entire ball surface of the core ball portion is wrapped with the compounding material. By heating the mold at the vulcanization temperature of the compounding material and vulcanizing, the frictional resistance between the coating portion and a flat surface formed of any of cylindrical, conical, and needle-shaped protrusions Then, the projections and the projections are formed. Taking out a flat park golf ball the finished density, and shrinkage treatment by rapidly cooling the covering section, and finally, deburring process, flat park golf ball manufacturing method characterized by. 2. A coating, and a group of projections on the outer surface of the coating,
In producing a seamless flat park golf ball having a mark covering portion as a mark portion and a mark protrusion group on the outer surface of the mark covering portion, a spherical core ball portion, the covering portion and the protrusion group A first compounding material, a second compounding material that is a material of the mark covering portion and the mark protrusion group, and an upper and lower half mold for forming a flat park golf ball having the mark portion. After filling the second compounding material into the molding portion of the mark portion of the upper and lower half mold, the first compounding material is filled into the entire upper and lower half mold, and the upper and lower half molds are filled. The core ball portion is arranged so as to be sandwiched by split molds, the upper and lower half molds are sealed, high pressure is applied to the upper and lower half molds, and the entire ball surface of the core ball portion is subjected to the first blending. Wrap it with the material By heating and vulcanizing the composite material and the second compounding material at the vulcanization temperature, the coating portion and the mark coating portion can be formed into any one of a columnar shape, a conical shape, and a needle shape. Forming the projection group and the mark projection group that generate frictional resistance with a flat surface, and then take out a flat park golf ball finished to a predetermined specific gravity from the upper and lower half molds, A shrinking process by rapidly cooling the portion and the mark covering portion, and finally performing a deburring process. 3. The method according to claim 1, wherein the high pressure is about 150 tons, and a specific gravity of the core ball is about 1.45 to 1.5. Of manufacturing a flat park golf ball. 4. The vulcanization treatment according to claim 1, 2 or 3, wherein the vulcanization treatment is a low-temperature heating vulcanization treatment for a predetermined short time at a vulcanization temperature of about 145 ° C. to about 150 ° C. A method of manufacturing a flat park golf ball. 5. The core ball portion is made of a resin having a low shock absorption and a high resilience at a heat resistance temperature of about 150 ° C. to 180 ° C., and an elastic material having a super shock absorption and an ultra low resilience. The method for manufacturing a flat park golf ball according to claim 1, wherein the method comprises one or a combination. 6. The method according to claim 5, wherein the resin includes a nylon resin, and the elastic material includes a rubber. 7. The method for manufacturing a flat park golf ball according to claim 1, wherein the compounding material is a material in which a pigment and an elastic material are compounded. 8. The method for manufacturing a flat park golf ball according to claim 7, wherein the elastic material of the compounding material is at least one or a combination of natural rubber and synthetic rubber. 9. The first compounding material is a material in which a pigment and an elastic material are compounded, and the second compounding material is different from the first compounding material in vulcanization conditions, and includes a pigment and an elastic material. 7. A method for manufacturing a flat park golf ball, wherein the material is at least one color material containing an elastic material. 10. The flatness according to claim 9, wherein the elastic material of the first compounding material and the second compounding material is one or a combination of natural rubber and synthetic rubber. Park golf ball manufacturing method. 11. A ball for flat park golf, comprising: a spherical core sphere serving as a core; a covering portion enclosing the core sphere; and one of a columnar shape, a conical shape, and a needle shape. And a projection group arranged on the outer surface of the covering portion with projections having a shape and configured to generate frictional resistance with a flat surface. 12. The ball also has a mark portion for identifying a player, the mark portion being a mark covering portion which is a covering portion of the mark portion, and a mark covering portion similar to the above-mentioned protrusion group. The flat park golf ball according to claim 11, comprising a group of mark projections. 13. The core ball portion is preferably made of a resin having a low shock absorption and a high resilience at a heat-resistant temperature of about 150 ° C. to 180 ° C., and an elastic material having a super shock absorption and a very low resilience. The flat park golf ball according to claim 11, wherein the ball is a material having at least one. 14. The flat park golf ball according to claim 13, wherein the resin includes a nylon resin, and the elastic material includes a rubber. 15. The flat park golf ball according to claim 11, wherein the covering portion and the protrusion are made of a material containing a pigment and an elastic material. 16. The flat park golf according to claim 15, wherein the elastic material in the material of the covering portion and the protruding portion is made of one or a combination of natural rubber and synthetic rubber. ball. 17. The mark covering portion and the mark protrusion group are made of a material containing a pigment and an elastic material, and are made of at least one color.
7. The flat park golf ball according to 6. 18. The flat park according to claim 17, wherein the elastic material in the material of the mark covering portion and the mark protrusion is made of one or a combination of natural rubber and synthetic rubber. Golf ball. 19. The method according to claim 11, wherein the specific gravity of the core ball portion is between about 1.45 and about 1.5.
19. The flat park golf ball according to 5, 16, 17 or 18.