JP2001145708A - Golf ball, and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a golf ball in which a part of resin cover material in a used golf ball or the like, and a unnecessary resin hardened and cut in a resin continuity groove of a mold generated when a gold ball is molded are reused, and a method of manufacturing for the ball. SOLUTION: In this golf ball comprising at least one layer of a resin cover applied around a core, the cover layer comprises original resin, and similar regenerated resin blended with it, and in this method of manufacturing for the golf ball, original resin and similar regenerated resin at a rate of 1-50% to total are blended to be injected into a cavity in a mold at high temperature and high pressure to mold the cover.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf ball using a recycled resin as a cover material and a method for manufacturing the ball.

[0002]

2. Description of the Related Art Solid balls, which are the mainstream of golf balls, have a structure in which a rubber core located at the center is mainly covered with a cover made of a thermoplastic resin such as an ionomer. Defective golf balls generated in the process, particularly the resin cover material, and unnecessary resin that is hardened and cut off during molding of the golf ball in the resin conductive groove (runner) of the mold is not reused. After being crushed and incinerated, landfill treatment had been performed.

[0003]

Since the resin cover is made of a high-calorie material, especially for incineration, which is performed prior to landfilling, the incinerator is severely damaged, so that the cost is large and the burning time and the burning time are high. The impact of the resulting ash on the environment after landfill could not be ignored. SUMMARY OF THE INVENTION The present invention has been made in view of such a problem, and a used golf ball, a defective portion of a golf ball generated in a manufacturing process, such as a resin cover material portion of an unnecessary golf ball, and a resin conductive groove of a mold are used. An object of the present invention is to provide a golf ball in which unnecessary resin hardened and cut off during molding of a golf ball is reused, and a method of manufacturing the same.

[0004]

According to the present invention, there is provided a golf ball having a core covered with at least one layer of a resin cover, wherein the cover layer comprises an original resin and a similar recycled resin blended therein. A golf ball, characterized in that:

A golf ball having a core covered with at least one layer of a thermoplastic resin cover is formed between a core disposed in the center of a spherical cavity in the mold and a cavity wall using a mold. In a method of manufacturing a golf ball in which the above resin is pressed into a void and molded, a recycled resin similar to the original resin is used in an amount of 1 to 50% of the total of the two.
And molding the cover by press-fitting at a high temperature and a high pressure into the cavity in the mold.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, the resin for the cover material is preferably a thermoplastic resin mainly composed of an ionomer. The proportion of the recycled resin is preferably 1 to 50% of the total of the original resin and the recycled resin, and 5 to 30%.
Is more preferable. According to experiments by the inventor, when a thermoplastic reclaimed resin such as an ionomer is used for a golf ball cover material, the releasability after in-mold molding is improved as compared with the case of using only the original resin, and the productivity is improved. It was found to be advantageous in terms of improvement.

In many cases, the cover separated from the ball used as the reclaimed resin has a white paint and / or a clear paint adhered thereto. It does not come about, and there is virtually no occurrence of surface roughness (lack of smoothness of the molding surface) due to moisture absorption, which is a concern for the use of recycled resin. And it turned out that there is no inferiority in the important flight performance. And for the above characteristics, the amount of recycled resin
It was found that the effect was better exhibited in the range of 30%.

[0008] In the resin conductive groove (runner) in the cover and the mold peeled off from the golf ball, when the resin or the like hardened and cut off at the time of molding the golf ball is used as a recycled resin, it is ground to a particle size of 5 mm or less. Although it is necessary to mix it with the original resin, according to the inventors' experiments,
It was found that the flowability of the runner, gate, mold cavity, and other molds in the mold was improved by using the recycled resin under the same temperature condition as compared with the case of using the original resin alone, and thus a good result was obtained with respect to the improvement in productivity. In addition, the particle diameter by resin pulverization means the diameter of a particle, or the maximum passing length.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. Figure 1 shows after molding
FIG. 2 is a plan view of the golf ball showing a state of being taken out of the mold, and FIG. 2 is a sectional view of the golf ball taken along line AA. In the figure, golf ball 1 (illustration of dimples) is
The resin 2 hardened in the mold runner and the resin 3 hardened in the gate are continuously linked together.These are cut off from the ball 1 and used from the used ball and the ball as a downgraded product generated in the manufacturing process. Stripped cover
Together with 5, it was pulverized to a particle size of 5 mm or less and used as a recycled resin. In the examples described below, the cured resin in the mold indicated by reference numeral 2 and the peeled cover 5 were almost half mixed, and used as a recycled resin.

In order to confirm the flight performance and durability of the golf ball according to the present invention and the workability in the method of manufacturing the ball, the recycled resin is used in an amount of 5%, 10%, 20%, 30%, 5% or less.
In addition to Examples 1 to 5 using 0% each,
A comparative test was conducted by making a prototype ball 1 of a two-piece solid type, using Comparative Example 1 using 00% and Comparative Example 2 using 100% of the original resin without using a recycled resin.

In the trial production, the following parts were commonly used for the core 4 part. That is, 1.4-cis-polybutadiene was used as the rubber material, the outer diameter and the mass of the core 4 were 38.6 mm and 35.1 g, respectively, and the hardness [on a flat plate, a force of 980.67 N (100 kgf) was applied. The amount of deformation that occurs when this occurs is 3.7 mm.

Table 1 shows details and test results of each example and comparative example. Table 1 For the cover material shown in Table 1, the ionomer resin Himilan 1705 was used for both the original and the recycled. The thickness of the cover 5 was 2 mm for all the test samples. The value of the initial speed in the performance column of Table 1 is a value when a hit is performed at a head speed of 45 m / s by a swing robot using a # 1 wood club. The numerical values shown in the hitting crack column in Table 1 indicate that ten balls 1 of various types were hit continuously under the same conditions as in the above-mentioned initial velocity value measurement, and cracks were generated for each type of test ball first. The number of hits to the ball is indicated as the start of a hitting crack, and the average value of the number of hits at the start of each hitting of 10 types is indicated as the average of the hitting cracks.

The releasability shown in Table 1 was excellent in each of the examples including the recycled resin and Comparative Example 1 using only the recycled resin as compared with Comparative Example 2 using only the original resin. Although not shown in Table 1, in Comparative Example 1, surface roughness of the cover 5 due to moisture absorption was remarkable. on the other hand,
As a result of the impact test, in each of the examples, a numerical value comparable to that of Comparative Example 2 in which the initial resin and the durability were 100% was obtained. The pass range for the number of hits at the start of cracking was 200
These are all numerical values with sufficient margin.

[0014]

As described above, the golf ball of the present invention in which a predetermined amount of the recycled resin is mixed with the original resin as the cover material is not inferior in performance to a ball made of 100% of the original resin, and the production of the ball is excellent. In (2), the releasability after molding is superior to that of the 100% original resin ball, which is advantageous in terms of productivity. Since the resin after use for golf balls that have been disposed of with fear of pollution in the past can be utilized as a golf ball cover material again by practicing the present invention without sacrificing the essential performance of the ball. It can also contribute to environmental conservation.

[Brief description of the drawings]

FIG. 1 is a plan view of a golf ball showing a state after being removed from a mold after molding.

FIG. 2 is a sectional view of the golf ball taken along line AA in FIG. 1;

[Explanation of symbols]

 Reference Signs List 1 golf ball 2 resin cured in mold runner 4 core 5 cover

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[Procedure amendment]

[Submission date] April 11, 2000 (2004.1.
1)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction contents]

Table 1 shows details and test results of each example and comparative example.

[Table 1] For the cover material shown in Table 1, the ionomer resin Himilan 1705 was used for both the original and the recycled. The thickness of the cover 5 was 2 mm for all the test samples. The value of the initial speed in the performance column of Table 1 is a value obtained by the R & A initial speed measuring method. Also, the numerical values shown in the hit cracking column in Table 1 are as follows: A swing robot using a # 1 wood club hits 10 balls 1 continuously at a head speed of 45 m / s, and cracks the fastest for each type of test ball. The number of hits to the ball that led to the occurrence of is displayed as the start of hitting cracks, and the average value of the number of hittings at the start of hitting for each type is displayed as the average hitting cracks.

Claims (6)

[Claims] 1. A golf ball comprising a core and at least one layer of a resin cover surrounding the core, wherein the cover layer comprises an original resin and a similar recycled resin blended therein. 2. The golf ball according to claim 1, wherein the mixing ratio of the recycled resin is 1 to 50% of the total of the original resin and the recycled resin. 3. The golf ball according to claim 2, wherein the compounding ratio of the recycled resin is 5 to 30% of the total of the original resin and the recycled resin. 4. The golf ball according to claim 1, wherein said cover is made of a thermoplastic resin mainly composed of an ionomer. 5. A golf ball having a core and a cover covered with at least one layer of a thermoplastic resin, using a mold,
In a method of manufacturing a golf ball in which the above resin is pressed into a cavity formed between a core disposed in the center of a spherical cavity in a mold and a cavity wall and molded, a recycled resin similar to the original resin is used. A method of manufacturing a golf ball, comprising mixing at a ratio of 1 to 50% of the total of the above and press-fitting the cover with high temperature and high pressure into the cavity in the mold to form a cover. 6. A resin and the like which is hardened and cut at the time of molding a golf ball in a resin conducting groove in a cover and a mold which is peeled off from a golf ball and is cut off to a particle size of 5 mm or less and mixed with the original resin. 6. The method for producing a golf ball according to claim 5, wherein