JP2005270383A - Tennis ball and method of manufacturing the same - Google Patents
Tennis ball and method of manufacturing the same Download PDFInfo
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- JP2005270383A JP2005270383A JP2004088958A JP2004088958A JP2005270383A JP 2005270383 A JP2005270383 A JP 2005270383A JP 2004088958 A JP2004088958 A JP 2004088958A JP 2004088958 A JP2004088958 A JP 2004088958A JP 2005270383 A JP2005270383 A JP 2005270383A
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本発明は、コア内部での化学反応により発生させたガスでコア内部の圧力を高めたテニスボールに関する。 The present invention relates to a tennis ball in which the pressure inside the core is increased by a gas generated by a chemical reaction inside the core.
テニスボールとして、コア内部での化学反応により発生させたガスでコア内部の圧力を大気圧より高くしたものがある（例えば、特許文献１参照）。このようなテニスボールは、例えば、下記（ａ）〜（ｃ）の手順で製造される。
（ａ）原料ゴム、充填剤、加硫剤、加硫促進剤などを混練したゴム組成物をシート状等に成形した後、押出成形を行って上記成形物をほぼコア半個分の量に切断する。次に、切断した押出成形物をハーフシェル用金型に入れて加硫成形し、加硫ゴムからなる半球形のハーフシェルを得る。
（ｂ）２個のハーフシェルを合わせ、両ハーフシェル間の中空部に塩化アンモニウムおよび亜硝酸ナトリウムを水溶液あるいは固体として入れた状態で、両ハーフシェルを加硫接着することにより、球形のコアを成形するとともに、塩化アンモニウムと亜硝酸ナトリウムとの下記反応により窒素ガスを発生させ、この窒素ガスでコア内部の圧力を大気圧の約２倍にしてボールの反発力を高める。
ＮＨ４Ｃｌ＋ＮａＮＯ２ → ＮａＣｌ＋Ｎ２＋２Ｈ２Ｏ
（ｃ）成形したコアの表面にフェルト状のメルトンを接着剤を用いて貼り合わせ、成形機に入れて加熱することによりテニスボールを完成させる。
Some tennis balls have a gas generated by a chemical reaction inside the core and the pressure inside the core is made higher than atmospheric pressure (see, for example, Patent Document 1). Such a tennis ball is manufactured, for example, by the following procedures (a) to (c).
(A) After forming a rubber composition kneaded with raw rubber, filler, vulcanizing agent, vulcanization accelerator, etc. into a sheet shape, etc., extrusion molding is carried out so that the amount of the molded product is approximately half of the core. Disconnect. Next, the cut extruded product is put into a half shell mold and vulcanized to obtain a hemispherical half shell made of vulcanized rubber.
(B) The two half shells are combined, and both the half shells are vulcanized and bonded together with ammonium chloride and sodium nitrite as an aqueous solution or solid in the hollow portion between the two half shells, thereby forming a spherical core. In addition to molding, nitrogen gas is generated by the following reaction between ammonium chloride and sodium nitrite, and the pressure inside the core is increased to about twice the atmospheric pressure with this nitrogen gas to increase the repulsive force of the ball.
NH 4 Cl + NaNO 2 → NaCl + N 2 + 2H 2 O
(C) A felt-like melton is bonded to the surface of the molded core using an adhesive, and the resultant is put into a molding machine and heated to complete a tennis ball.
前述したコア内部での化学反応により発生させたガスでコア内部の圧力を高めたテニスボールでは、コア内部における塩化アンモニウムと亜硝酸ナトリウムとの反応によって窒素ガスとともに塩化ナトリウムが生成する。この副生成物である塩化ナトリウムは、反応直後はコア内部に存在する水に溶解した状態となっているが、時間の経過とともに水分が蒸発し、コア内部の水分が減っていくと、塩化ナトリウムの結晶化が始まる。そして、この結晶が成長して大きくなると、テニスボールを動かしたときに大きくなった塩化ナトリウムの結晶がコア内部で転がり、カラカラという音がする現象が生じるようになり、テニスボールの商品価値やプレイヤーからの評価を低下させるものであった。 In a tennis ball in which the pressure inside the core is increased by the gas generated by the chemical reaction inside the core described above, sodium chloride is generated together with nitrogen gas by the reaction between ammonium chloride and sodium nitrite inside the core. This by-product sodium chloride is in a state dissolved in the water present in the core immediately after the reaction, but as time elapses, the water evaporates and the water in the core decreases. Begins to crystallize. When this crystal grows and grows, the sodium chloride crystal that grows when the tennis ball is moved rolls inside the core, causing a phenomenon that makes a sound of noise, and the product value of the tennis ball and the player The evaluation from was reduced.
本発明は、前述した事情に鑑みてなされたもので、化学反応により発生させたガスでコア内部の圧力を高めたテニスボールにおいて、前記化学反応に起因してコア内部に生成した固形物がテニスボールを動かしたときにコア内部で転がり、これによりコア内部から音が発生する現象を防止することが可能なテニスボールおよびその製造方法を提供することを目的とする。 The present invention has been made in view of the above-described circumstances. In a tennis ball in which the pressure inside the core is increased by a gas generated by a chemical reaction, the solid matter generated inside the core due to the chemical reaction is tennis. An object of the present invention is to provide a tennis ball that can be prevented from rolling inside the core when the ball is moved and thereby generating sound from the inside of the core, and a method for manufacturing the same.
本発明者は、前述した課題を解決すべく種々研究を行った結果、コア内部の固形物に粘着性を付与する粘着性付与物質をコア内部に封入した場合、コア内部の固形物の表面に上記粘着性付与物質が付着し、この粘着性付与物質の作用によって固形物がコアの内周壁に固着するようになり、そのためテニスボールを動かしたときでも固形物がコア内部で転がらなくなり、したがってコア内部から固形物による音が発生しなくなることを見出した。 As a result of conducting various studies to solve the above-described problems, the present inventors have found that when a tackifier that imparts tackiness to the solid matter inside the core is sealed inside the core, the surface of the solid matter inside the core The tackifier substance adheres, and the solid substance adheres to the inner peripheral wall of the core due to the action of the tackifier substance. Therefore, even when the tennis ball is moved, the solid substance does not roll inside the core. It was found that no sound due to solid matter was generated from the inside.
本発明は、上述した知見に基づいてなされたもので、コア内部での化学反応により発生させたガスでコア内部の圧力を大気圧より高くしたテニスボールにおいて、前記化学反応によってコア内部に生成した固形物に粘着性を付与する粘着性付与物質をコア内部に封入したことを特徴とするテニスボールを提供する。 The present invention has been made on the basis of the above-described knowledge, and in a tennis ball in which the pressure inside the core is made higher than the atmospheric pressure by the gas generated by the chemical reaction inside the core, the inside of the core is generated by the chemical reaction. There is provided a tennis ball characterized in that a tackifying substance for imparting tackiness to a solid is enclosed in a core.
また、本発明は、コア内部での化学反応により発生させたガスでコア内部の圧力を大気圧より高くしたテニスボールの製造方法において、前記化学反応の原料物質と、前記化学反応によってコア内部に生成した固形物に粘着性を付与する粘着性付与物質とをコア内部に封入した状態で前記化学反応を行わせることを特徴とするテニスボールの製造方法を提供する。 The present invention also provides a method for manufacturing a tennis ball in which the pressure inside the core is made higher than atmospheric pressure by a gas generated by a chemical reaction inside the core, and the raw material of the chemical reaction and the inside of the core by the chemical reaction. Provided is a method for producing a tennis ball, characterized in that the chemical reaction is carried out in a state in which a tackifier that imparts tackiness to the generated solid is enclosed in a core.
本発明に係るテニスボールおよびその製造方法によれば、ガス発生の化学反応に起因して生成した固形物がコア内部で転がって音が発生する現象を防止することができ、したがって上記音の発生によるテニスボールの商品価値やプレイヤーからの評価の低下を防ぐことができる。 According to the tennis ball and the manufacturing method thereof according to the present invention, it is possible to prevent a phenomenon in which a solid generated due to a gas generation chemical reaction rolls inside the core to generate a sound, and thus the generation of the sound. It is possible to prevent a decline in the product value of the tennis ball and the evaluation from the player.
以下、本発明につきさらに詳しく説明する。本発明において、コア内部でガスを発生させる化学反応としては、前述した塩化アンモニウムと亜硝酸ナトリウムとの反応により窒素ガスを発生させる反応の他、例えば、硫酸アンモニウムと亜硝酸ナトリウムとの反応により窒素ガスを発生させる下記反応を挙げることができる。この反応では、硫酸ナトリウムが副生成し、水分の蒸発によってコア内部に硫酸ナトリウムの固形物が生じる。
（ＮＨ４）２ＳＯ４＋２ＮａＮＯ２ → Ｎａ２ＳＯ４＋２Ｎ２＋４Ｈ２Ｏ
Hereinafter, the present invention will be described in more detail. In the present invention, as the chemical reaction for generating gas inside the core, in addition to the reaction for generating nitrogen gas by the reaction of ammonium chloride and sodium nitrite as described above, for example, nitrogen gas by the reaction of ammonium sulfate and sodium nitrite. The following reactions can be mentioned. In this reaction, sodium sulfate is by-produced, and solid sodium sulfate is generated inside the core by evaporation of moisture.
(NH 4 ) 2 SO 4 + 2NaNO 2 → Na 2 SO 4 + 2N 2 + 4H 2 O
上記ガスを発生させる化学反応の原料物質（ガス発生剤）、すなわち塩化アンモニウム、硫酸アンモニウム、亜硝酸ナトリウムなどは、水溶液としてハーフシェル間の中空部に入れて反応を行わせてもよく、固体としてハーフシェル間の中空部に入れ、この中空部に水を注入して反応を行わせてもよい。 The chemical reaction raw material (gas generating agent) for generating the gas, that is, ammonium chloride, ammonium sulfate, sodium nitrite, etc., may be put into the hollow part between the half shells as an aqueous solution to carry out the reaction, and the half as a solid The reaction may be carried out by putting in a hollow portion between the shells and injecting water into the hollow portion.
また、本発明で用いる粘着性付与物質としては、コア内部で生成した固形物に付着して該固形物に粘着性を付与し、この固形物がコアの内周壁に接触したときにコアの内周壁に固着するようになるものであればいずれのものでも用いることができる。この場合、ガス発生の原料物質をコア内部に入れる際には水を使用するので、水に溶解または混合する粘着性付与物質あるいは水を吸収してゲル状になる粘着性付与物質は音の発生を抑制する効果が高く、またボール製造の生産性を維持できることから好適である。 Further, as the tackifier used in the present invention, it adheres to the solid generated inside the core to give the solid, and when the solid contacts the inner peripheral wall of the core, Any material can be used as long as it adheres to the peripheral wall. In this case, since water is used when the gas generating raw material is put into the core, a tackifier that dissolves or mixes in water or a tackifier that absorbs water and forms a gel will generate sound. This is preferable because it has a high effect of suppressing the production of the ball and can maintain the productivity of ball production.
粘着性付与物質の具体例としては、一般的に増粘剤として使用される物質、例えばポリエチレングリコール、ポリプロピレングリコール、グリセリン、ジプロピレングリコール、ブチレングリコール等；化粧品において増粘剤として使用される物質、例えばアラビアガム、カルボキシビニルポリマー、アルギン酸ナトリウム、ポリアクリル酸ナトリウム、カルボキシメチルセルロースナトリウム等；化粧品において保湿剤として使用される物質、例えば乳酸ナトリウム、ゼラチン等が挙げられるが、これらに限定されるものではない。これらの中で特に好ましいのは、ポリエチレングリコール、ポリプロピレングリコール、グリセリンであり、中でもポリエチレングリコールである。ポリエチレングリコールとしては、平均分子量が２００〜６００程度のものが好ましく、特に２００〜３００程度のものがよい。 Specific examples of tackifiers include substances generally used as thickeners, such as polyethylene glycol, polypropylene glycol, glycerin, dipropylene glycol, butylene glycol, and the like; substances used as thickeners in cosmetics, Examples include gum arabic, carboxyvinyl polymer, sodium alginate, sodium polyacrylate, sodium carboxymethyl cellulose, etc .; substances used as a moisturizer in cosmetics, such as sodium lactate, gelatin, etc., but are not limited thereto. . Among these, polyethylene glycol, polypropylene glycol, and glycerin are particularly preferable, and polyethylene glycol is particularly preferable. The polyethylene glycol preferably has an average molecular weight of about 200 to 600, and particularly preferably about 200 to 300.
コア内部への粘着性付与物質の封入量は、粘着性付与物質の種類等に応じて適宜設定することができるが、通常、ガス発生の化学反応によってコア内部に生成した固形物（塩化ナトリウム、硫酸ナトリウムの結晶など）の質量の０．２〜２倍、特に０．３〜０．８倍の質量とすることが適当である。 The amount of the tackifier substance enclosed in the core can be appropriately set according to the type of the tackifier substance, etc., but usually solids (sodium chloride, It is appropriate that the mass is 0.2 to 2 times, especially 0.3 to 0.8 times the mass of the sodium sulfate crystals.
粘着性付与物質をコア内部に封入する方法に限定はないが、ガス発生剤、すなわち塩化アンモニウム、硫酸アンモニウム、亜硝酸ナトリウムなどを水溶液としてハーフシェル間の中空部に入れる場合には、ガス発生剤の水溶液のいずれかに粘着性付与物質を予め溶解しておく方法や、ガス発生剤の水溶液とは別に粘着性付与物質の水溶液をハーフシェル間の中空部に入れる方法を採ることができる。また、ガス発生剤を固体としてハーフシェル間の中空部に入れる場合には、ガス発生剤の固体とは別に粘着性付与物質の水溶液をハーフシェル間の中空部に入れる方法を採ることができる。 There is no limitation on the method of enclosing the tackifier inside the core, but when the gas generating agent, that is, ammonium chloride, ammonium sulfate, sodium nitrite, etc. is put in the hollow part between the half shells as an aqueous solution, the gas generating agent A method of previously dissolving the tackifier in any of the aqueous solutions, or a method of putting an aqueous solution of the tackifier in the hollow portion between the half shells separately from the aqueous solution of the gas generating agent can be employed. In addition, when the gas generating agent is put in the hollow portion between the half shells as a solid, a method in which an aqueous solution of a tackifier is put into the hollow portion between the half shells separately from the solid of the gas generating agent can be employed.
天然ゴム８０質量部、ポリブタジエンゴム２０質量部、酸化亜鉛１０質量部、充填剤５５質量部、加硫促進剤２．５質量部および硫黄５質量部をニーダーで混練りしてゴム組成物を作製した後、このゴム組成物をシート状に成形した。その後、押出成形を行って上記シート状成形物をほぼコア半個分の量に切断した。この切断した押出成形物をハーフシェル用金型に入れて加硫成形し、加硫ゴムからなる半球形のハーフシェルを得た。 A rubber composition is prepared by kneading 80 parts by mass of natural rubber, 20 parts by mass of polybutadiene rubber, 10 parts by mass of zinc oxide, 55 parts by mass of a filler, 2.5 parts by mass of a vulcanization accelerator and 5 parts by mass of sulfur. Then, this rubber composition was formed into a sheet shape. Thereafter, extrusion molding was performed, and the sheet-like molded product was cut into an amount approximately equivalent to a half core. The cut extruded product was put in a half shell mold and vulcanized to obtain a hemispherical half shell made of vulcanized rubber.
次いで、２個のハーフシェルを合わせ、両ハーフシェル間の中空部に塩化アンモニウム水溶液および亜硝酸ナトリウム水溶液を入れた状態で、両ハーフシェルにゴム糊を付けて加硫することにより、球形のコアを成形するとともに、塩化アンモニウムと亜硝酸ナトリウムとの反応により窒素ガスを発生させ、この窒素ガスでコア内部の圧力を大気圧の約２倍にした。さらに、接着剤を付着させたメルトンをコア表面に貼り合わせ、成形機に入れて加熱することによりテニスボールを製造した。 Next, the two half shells are put together, and in a state where an aqueous solution of ammonium chloride and an aqueous solution of sodium nitrite are put in the hollow part between the two half shells, rubber shells are attached to both half shells and vulcanized to form a spherical core. In addition, nitrogen gas was generated by the reaction of ammonium chloride and sodium nitrite, and the pressure inside the core was increased to about twice the atmospheric pressure with this nitrogen gas. Furthermore, a tennis ball was manufactured by laminating the melton to which the adhesive was attached to the core surface, placing it in a molding machine and heating.
このとき、前記塩化アンモニウム水溶液として下記表１に示す塩化アンモニウム水溶液（１）、（２）を製造し、前記亜硝酸ナトリウム水溶液として下記表２に示す亜硝酸ナトリウム水溶液（１）〜（４）を製造するとともに、これら塩化アンモニウム水溶液および亜硝酸ナトリウム水溶液を表３に示す組み合わせで両ハーフシェル間の中空部に入れて反応を行わせることにより、表３に示す実施例１〜４および比較例のテニスボールを得た。なお、表１および表２におけるポリエチレングリコールとしては、平均分子量２００のものを用いた。 At this time, ammonium chloride aqueous solutions (1) and (2) shown in Table 1 below were prepared as the ammonium chloride aqueous solution, and sodium nitrite aqueous solutions (1) to (4) shown in Table 2 below as the sodium nitrite aqueous solution. While producing these ammonium chloride aqueous solution and sodium nitrite aqueous solution in the hollow portion between both half shells in the combinations shown in Table 3, the reaction of Examples 1 to 4 and Comparative Example shown in Table 3 was performed. I got a tennis ball. In addition, as the polyethylene glycol in Table 1 and Table 2, those having an average molecular weight of 200 were used.
実施例１〜４および比較例のテニスボール各１０個にそれぞれ直径３ｍｍの孔を３個形成し、このテニスボールを４０℃の恒温槽に３週間静置した後、各テニスボールを振り、音の発生具体を調べることにより、ガラ鳴りの評価を行った。結果を表３に示す。表３の結果より、本発明によれば、ガス発生の化学反応に起因して生成した固形物（塩化ナトリウムの結晶）がコア内部で転がって音が発生する現象を防止できることが確認された。
Three holes each having a diameter of 3 mm were formed in each of the ten tennis balls of Examples 1 to 4 and the comparative example, and the tennis balls were left in a constant temperature bath at 40 ° C. for 3 weeks. By examining the specifics of the occurrence of noise, we evaluated the noise. The results are shown in Table 3. From the results shown in Table 3, it was confirmed that according to the present invention, it was possible to prevent a phenomenon in which solids (crystals of sodium chloride) produced due to a gas generation chemical reaction roll inside the core and generate sound.
Claims (6)
The method for producing a tennis ball according to claim 4 or 5, wherein the tackifier is at least one selected from polyethylene glycol, polypropylene glycol and glycerin.
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| JP2004088958A JP4387849B2 (en) | 2004-03-25 | 2004-03-25 | Tennis ball and manufacturing method thereof |
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| JP2005270383A true JP2005270383A (en) | 2005-10-06 |
| JP4387849B2 JP4387849B2 (en) | 2009-12-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7318477B2 (en) | 2019-10-15 | 2023-08-01 | ブリヂストンスポーツ株式会社 | multi-piece solid golf ball |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP7318477B2 (en) | 2019-10-15 | 2023-08-01 | ブリヂストンスポーツ株式会社 | multi-piece solid golf ball |
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