KR100329725B1 - Non-pressure Tennis Ball - Google Patents
Non-pressure Tennis Ball Download PDFInfo
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- KR100329725B1 KR100329725B1 KR1019990023063A KR19990023063A KR100329725B1 KR 100329725 B1 KR100329725 B1 KR 100329725B1 KR 1019990023063 A KR1019990023063 A KR 1019990023063A KR 19990023063 A KR19990023063 A KR 19990023063A KR 100329725 B1 KR100329725 B1 KR 100329725B1
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- Prior art keywords
- ball
- tennis
- tennis ball
- fast
- foam
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Links
- 239000006260 foam Substances 0.000 claims abstract description 13
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 9
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 9
- 230000005484 gravity Effects 0.000 claims description 3
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 2
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 claims description 2
- 239000011496 polyurethane foam Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000005187 foaming Methods 0.000 description 8
- 229920005989 resin Polymers 0.000 description 7
- 239000011347 resin Substances 0.000 description 7
- 238000000465 moulding Methods 0.000 description 6
- 229920001971 elastomer Polymers 0.000 description 5
- 239000005060 rubber Substances 0.000 description 5
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 4
- 239000000945 filler Substances 0.000 description 4
- 229920005749 polyurethane resin Polymers 0.000 description 4
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000012744 reinforcing agent Substances 0.000 description 3
- 239000003381 stabilizer Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- BYLSIPUARIZAHZ-UHFFFAOYSA-N 2,4,6-tris(1-phenylethyl)phenol Chemical compound C=1C(C(C)C=2C=CC=CC=2)=C(O)C(C(C)C=2C=CC=CC=2)=CC=1C(C)C1=CC=CC=C1 BYLSIPUARIZAHZ-UHFFFAOYSA-N 0.000 description 2
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 description 2
- OZAIFHULBGXAKX-VAWYXSNFSA-N AIBN Substances N#CC(C)(C)\N=N\C(C)(C)C#N OZAIFHULBGXAKX-VAWYXSNFSA-N 0.000 description 2
- 239000004604 Blowing Agent Substances 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical class [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- KWYHDKDOAIKMQN-UHFFFAOYSA-N N,N,N',N'-tetramethylethylenediamine Chemical compound CN(C)CCN(C)C KWYHDKDOAIKMQN-UHFFFAOYSA-N 0.000 description 2
- 235000021355 Stearic acid Nutrition 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- 230000003078 antioxidant effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000003431 cross linking reagent Substances 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000008117 stearic acid Substances 0.000 description 2
- 238000004148 unit process Methods 0.000 description 2
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 2
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 244000137852 Petrea volubilis Species 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000004902 Softening Agent Substances 0.000 description 1
- -1 accelerator Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 235000009508 confectionery Nutrition 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000006263 elastomeric foam Substances 0.000 description 1
- 210000000497 foam cell Anatomy 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000010068 moulding (rubber) Methods 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 229910017464 nitrogen compound Inorganic materials 0.000 description 1
- 150000002830 nitrogen compounds Chemical class 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000010058 rubber compounding Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B39/00—Hollow non-inflatable balls, i.e. having no valves
- A63B39/06—Special coverings
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/04—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres having existing or potential cohesive properties, e.g. natural fibres, prestretched or fibrillated artificial fibres
- D04H1/08—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres having existing or potential cohesive properties, e.g. natural fibres, prestretched or fibrillated artificial fibres and hardened by felting; Felts or felted products
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B2209/00—Characteristics of used materials
- A63B2209/02—Characteristics of used materials with reinforcing fibres, e.g. carbon, polyamide fibres
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
본 발명은 속공의 표면 전면에 휄트를 접착시켜서 된 테니스공에 있어서, 속공을 탄성발포체로 하는 무압 테니스공에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-pressure tennis ball in which a fast ball is used as an elastic foam in a tennis ball bonded to the front surface of the fast ball.
본 발명의 테니스공은 종래의 테니스공에 비하여 무게에는 차이가 없으면서 볼의 속도를 느리게 조절 가능하므로 노약자나 초보자도 테니스를 쉽게 즐기게 하여 줄수 있으며. 볼의 수명도 길고 안전하며 협소한 장소에서도 테니스를 즐길 수 있다는 이점이 있고 제조방법도 종래의 테니볼 제조방법보다 간단하다는 효과가 있다.The tennis ball of the present invention can be adjusted to slow the speed of the ball without any difference in weight compared to the conventional tennis ball, so that the elderly and beginners can easily enjoy tennis. The long life of the ball is safe and has the advantage that you can enjoy tennis in a narrow place, and the manufacturing method is also simpler than the conventional tennis ball manufacturing method.
Description
본 발명은 속공을 탄성발포체로 하는 무압(無壓) 테니스공에 관한 것이다.The present invention relates to a non-pressure tennis ball having a fast hole as an elastic foam.
종래의 테니스공은 약 0.7㎏/㎠ 의 내부 공기압을 갖고 있는 중공체(中空體)로 되어 있다.The conventional tennis ball is a hollow body having an internal air pressure of about 0.7 kg / cm 2.
이 중공체의 테니스공은 라켓(Racket)으로 타격시 반발력이 커서 공의 속도가 빠르고 바운드도 높아 테니스는 청·장년층이 즐기기에 적합한 운동이기는 하나 숙련되는데는 많은 훈련시간이 필요하게되어 노약자나 초보자 등 남녀노소가 모두 쉽게 배워서 즐길수 없다는 단점이 있다.The tennis ball of the hollow body has a high rebound force when it is hit by a racket, so the speed of the ball is high and the bound is high. Therefore, tennis is a sport suitable for the young and old, but it requires a lot of training time for the old and the elderly. Both young and old have a disadvantage that they can't learn easily.
일반적으로 테니스공의 속도는 100∼150㎞/hr이고 볼의 바운드는 254㎝ 높이에서 자유낙하시 135∼145㎝ 범위에 있다.In general, the speed of a tennis ball is 100-150 km / hr and the bound of the ball is in the range of 135-145 cm at free fall at 254 cm height.
따라서 공의 속도가 빠르기 때문에 초보자가 공을 라켓의 스위트포인트(Sweet Point)에 맞추어야 하는 시간이 짧게 되므로 볼을 컨트롤하기 어렵고 이를 숙련하는데는 장시간의 훈련이 필요하다.Therefore, because the speed of the ball is fast, the time for the beginner to adjust the ball to the sweet point of the racket is short, so it is difficult to control the ball and requires a long time to train the skill.
따라서 소년이나 노약자가 테니스를 배우기가 어려워 한 코트에서 가족단위로 남녀노소가 함께 즐기기가 어려운 운동이 되었다.As a result, it was difficult for boys and older children to enjoy tennis together as a family unit on a court where it was difficult for a boy or an elderly person to learn tennis.
중공체 테니스공의 제조공정은 천연고무나 합성고무에 가황제, 촉진제, 충진제, 유연제 등을 첨가하여 만든 혼합 고무편을 반구형 금형에 넣어 150℃에서 4~5분간 프레스 하여 반구(반쪽의 구)를 성형하고, 성형한 반구를 샌드페이퍼로 옆면을 연마하여, 다른 반구와 접착시켜 속공을 성형한다.The manufacturing process of the hollow tennis ball is made of natural rubber or synthetic rubber by adding vulcanizing agent, accelerator, filler, softening agent, etc. After molding, the formed hemisphere is ground by sand paper and bonded to other hemispheres to form a fast hole.
성형한 속공의 표면에 고무풀을 도포한 다음 아령형() 휄트 조각 2개를 속공 표면에 접착하여 테니스 볼을 성형한다.Apply rubber paste to the surface of the formed fast hole, and then ) Two tennis pieces are glued to the surface of the fast ball to form a tennis ball.
즉, 종래 테니스공은 첨부도면 도 3에 도시된 바와같이, 두께 3.3~4.5mm의 고무로 반구를 형성하고 이 반구 2개를 접착시켜 외부직경 61~63mm의 크기를 갖는 속공을 이용하여 약 0.7kg/cm2의 내부공기압을 갖는 중공체로 이루어지며, 그 제조공정은 고무배합→고무편성형→반구성형→연마→옆면풀칠→속공성형→표면풀칠→휄트접착→볼성형→마킹→포장의 11개의 단위공정으로 되어 있어, 설비투자가 많이 들고 생산성이 낮다는 어려움이 있다.That is, the conventional tennis ball is formed as a hemisphere with a rubber of 3.3 ~ 4.5mm thick, and bonded two hemispheres by using a fast ball having a size of an outer diameter of 61 ~ 63mm as shown in Figure 3 attached to the drawing It consists of a hollow body with an internal air pressure of kg / cm 2 , and the manufacturing process is made of rubber compounding → rubber molding → semi-component molding → polishing → side coating → fast molding → surface coating → bolt bonding → ball molding → marking → packaging It has two unit processes, which requires a lot of equipment investment and low productivity.
본 발명의 목적은 종래의 중공체 테니스공이 반발력이 크고 바운드가 높으며 공의 속도가 빨라서 노약자나 초보자가 테니스를 쉽게 배워 즐길 수 없는 점에 착안하여 공의 무게에는 차이가 없으면서 볼의 속도를 느리게 조절 가능하게 하므로서 노약자나 초보자도 쉽게 테니스를 즐길수 있도록 하여 줄수 있는 발포탄성체를 속공으로 하는 무압테니스공을 제공하는데 있다.The object of the present invention is to focus on the slow ball of the ball without the difference in the weight of the ball by paying attention to the conventional resilient tennis ball has a high rebound force, high bound and fast ball speed, the elderly or beginners can not easily learn tennis By making it possible, the elderly and beginners can easily enjoy playing tennis, and it is to provide a pressureless tennis ball with a foam elastic body which can give.
도 1a는 본 발명에 따른 무압 테니스공을 나타내는 단면도,Figure 1a is a cross-sectional view showing a pressureless tennis ball according to the present invention,
도 1b는 정면도,1b is a front view,
도 1c는 평면도,1c is a plan view,
도 1d는 측면도이다.1D is a side view.
도2는 본 발명에 따른 속공을 나타내는 단면도,2 is a cross-sectional view showing a fast speed in accordance with the present invention;
도3은 종래의 속공을 나타내는 단면도이다.3 is a cross-sectional view showing a conventional fast hole.
- 도면의 주요부분에 대한 부호의 설명 --Explanation of symbols for the main parts of the drawings-
1, A, A' : 휄트 2 : 고무접착제 3 : 속공 B : 이음고무1, A, A ': Bolt 2: Rubber adhesive 3: Fastening B: Joint rubber
본 발명은 발포 탄성체를 속공으로 하는 중공체가 아닌 무압테니스공에 관한 것이다.The present invention relates to a pressureless tennis ball, not a hollow body having a foamed elastic body as a fast hole.
본 발명의 테니스공은 도1에 도시한 바와 같이 외관은 종래의 테니스공과 같다.The tennis ball of the present invention has the same appearance as a conventional tennis ball as shown in FIG.
도 2는 본 발명에 따른 속공을 나타내는 단면도로서, 테니스공의 속공 3은 균일하게 발포시킨 합성수지로 된 구형(球形) 탄성발포체이다. 이탄성 발포체의 발포도에 따라 테니스볼의 반발력과 속도를 조절하여 줄수 있다.Figure 2 is a cross-sectional view showing a fast hole according to the present invention, the fast ball 3 of the tennis ball is a spherical elastic foam of a synthetic resin foamed uniformly. The resilience and speed of the tennis ball can be adjusted according to the degree of foaming of the elastic foam.
예를들면 보강제, 안정제, 산화방지제 등의 첨가제가 첨가된 폴리우레탄수지 100g에 발포제로 프레온가스 2∼5㎖을 충진 발포시켜서 된 비중 0.3~0.5g/cm3인 폴리우레탄폼(Poly Urethane foam)을 속공으로 하는 경우 테니스공의 반발력은 종래의 테니스공에 비하여 약 30∼50% 정도 감소하게 되며 이때 볼의 속도는 70∼100㎞/hr 바운드는 254㎝ 높이에서 자유낙하시 110∼120㎝ 정도이다.For example, Polyurethane foam having a specific gravity of 0.3 to 0.5 g / cm 3 obtained by filling and foaming 2-5 ml of freon gas with 100 g of a polyurethane resin containing additives such as a reinforcing agent, stabilizer, and antioxidant. In the case of a fast ball, the repulsive force of the tennis ball is reduced by about 30 to 50% compared to the conventional tennis ball. At this time, the speed of the ball is about 70 to 100 km / hr. to be.
본 발명에서 속공은 폴리우레탄 수지(Polyurethane Resins) 또는 에틸렌비닐아세테이트코포리머(Ethylene-Vinyl Acetate Copolymer)에 산화방지제, 충진제, 가교제, 발포제, 안정제, 분산제 등을 혼합시킨 후 금형에 넣고 상온(25~30℃)에서 7~10분간 또는 140~150℃에서 5~7분간 수지를 발포제로 물과 프레온 가스 또는 질소 화합물을 사용하여 발포시켜 속공을 성형한다.In the present invention, the fast hole is a mixture of an antioxidant, a filler, a crosslinking agent, a foaming agent, a stabilizer, a dispersant, and the like in a polyurethane resin or an ethylene vinyl acetate copolymer, and then placed in a mold. 30 ° C.) for 7 to 10 minutes or 140 to 150 ° C. for 5 to 7 minutes to form a fast hole by foaming the resin with a blowing agent using water, a freon gas, or a nitrogen compound.
이하 실시예를 들어 본발명은 구체적으로 설명한다.The present invention will be described in detail with reference to the following Examples.
실시예 1Example 1
<폴리우레탄 수지를 속공의 원료로 하는 경우><When a polyurethane resin is used as a raw material of a fast hole>
액상 폴리우레탄(Poly Urethane) 수지 100g과 활성탄산칼슘 10g, 물 3g, 스테아린산아연 1g, 테트라메틸에틸렌디아민 0.5g, 실리콘오일 0.5g을 균일하게 혼합한 후 여기에 프레온 가스 5ml을 주입한 후 이 혼합물을 사출(Injection) 방법으로 속공금형에 넣어 금형온도 30~35℃에서 7~10분간 발포시켜 연속기포를 갖는 우레탄폼(Urethane foam) 속공을 성형한다.100 g of a liquid polyurethane resin, 10 g of activated calcium carbonate, 3 g of water, 1 g of zinc stearate, 0.5 g of tetramethylethylenediamine, and 0.5 g of silicon oil are mixed uniformly, and then 5 ml of freon gas is injected into the mixture. It is put into a fast hole mold by the injection method to foam for 7-10 minutes at a mold temperature of 30 ~ 35 ℃ to form a urethane foam (urethane foam) has a continuous bubble.
여기에서 활성탄산칼슘은 충진제겸 보강제로 사용되며 무수규산이나 염기성 마그네슘을 사용할 수도 있다. 물은 발포조제로, 프레온은 발포조제로, 스테아린산 아연은 안정제로 사용되는 것이며 테트라메틸에틸렌디아민은 촉매로, 실리콘 오일은 분산제로 사용되는 것이다.Here, activated calcium carbonate is used as a filler and reinforcing agent, and silicic anhydride or basic magnesium may be used. Water is used as foaming aid, Freon is used as foaming aid, zinc stearate is used as stabilizer, tetramethylethylenediamine is used as catalyst and silicone oil is used as dispersant.
실시예 2Example 2
에틸렌 비닐 아세티이트 코포리머(EVA)를 속공의 원료로 하는 경우When using ethylene vinyl acetate copolymer (EVA) as a raw material
고상 에틸렌비닐아세테이트수지(이하 EVA수지라 한다.) 100g과 무수규산 10g, 스테아린산 2g, 디큐밀퍼옥사이드(dicumyl peroxide) 2g, 스티레네이티드 페놀(styrenated phenol) 5g, 아조비스이소부티로니트릴(이하 AIBN이라 한다) 10g을 50~70℃의 혼합로울러(Mixing Roller)를 이용하여 균일하게 혼합한후 시트상으로 성형한 다음 약 1일간 숙성시킨다.100 g of solid ethylene vinyl acetate resin (hereinafter referred to as EVA resin), 10 g of silicic anhydride, 2 g of stearic acid, 2 g of dicumyl peroxide, 5 g of styrenated phenol, azobisisobutyronitrile (hereinafter AIBN) 10g is uniformly mixed by using a mixing roller (Mixing Roller) of 50 ~ 70 ℃ and molded into a sheet and then aged for about 1 day.
여기에서 무수규산은 충진제겸 보강제로 사용되는 것이며 디큐밀퍼옥사이드는 가교제로, 스테아린산은 연화제로, 스티레네이티드페놀은 노화방지제로, AIBN은 발포제로 사용되는 것이다.Here, silicic anhydride is used as a filler and reinforcing agent, dicumylperoxide is used as a crosslinking agent, stearic acid is used as a softener, styrenated phenol is used as an anti-aging agent, and AIBN is used as a blowing agent.
숙성된 시트를 로울러로 다시 혼련시켜 금형에 비슷한 타원형 형태의 고무편을 만들어 금형에 넣고 140~150℃에서 5~7분간 열에 의한 가교 시키는 발포 작업으로 EVA수지에 독립기포(closed cell)를 형성하며 속공 금형을 충만 성형시켜 EVA수지 폼(form)의 속공을 성형한다. 이 속공표면에 종래의 테니스볼과 같이 휄트를 접착시켜 본 발명의 테니스공을 제조한다.속공의 발포정도는 비중이 0.3~0.5g/cm3로 정해지며 이와같은 발포정도를 갖는 탄성발포체가 폴리우레탄 속공인 경우 70~90km/hr의 속력을 가지는 테니스 볼로 만들어 질수 있으며 종전의 테니스공에 가까운 물성으로 훈련용 또는 연습용으로도 사용 가능하다. 탄성발포체가 에틸렌비닐아세테이트코포리머의 속공은 50~70km/hr 속력을 가진 테니스볼로 만들 수 있어 초보자 노약자들이 보다 쉽게 사용할 수 있으며 어린이 경식 야구공을 대치할 수도 있다.The aged sheet is kneaded again with a roller to make an oval-shaped rubber piece similar to the mold, and put into a mold to form a closed cell in the EVA resin by foaming to crosslink by heat at 140-150 ° C for 5-7 minutes. A fast hole mold is filled to form a fast hole of an EVA resin foam. The tennis ball of the present invention is manufactured by adhering a bolt to the surface of the fastball as in the conventional tennis ball. The foaming degree of the fastball is determined by a specific gravity of 0.3 to 0.5 g / cm 3 and the elastic foam having such a foaming degree is made of poly In the case of urethane fastballs, it can be made of tennis balls with a speed of 70 ~ 90km / hr, and can be used for training or practice as the physical properties close to the previous tennis balls. Elastomeric foam can be made of ethylene vinyl acetate copolymer fasteners can be used as a tennis ball with a speed of 50 ~ 70km / hr can be easily used by beginners and seniors, and can replace the children's hard baseballs.
즉, 본 발명의 테니스공 제조공정은 배합→속공성형→표면풀칠→휄트접착→볼성형→마킹→포장의 7개의 단위공정으로 구성되므로 종래 테니볼 제조공정의 11개 단위공정보다 4개공정을 줄여 줄수 있어 생산성이 크게 증대된다.In other words, the tennis ball manufacturing process of the present invention is composed of seven unit processes of compounding → fast molding → surface coating → bolt bonding → ball molding → marking → packaging. It can reduce the productivity, greatly increases.
또한, 종래의 방법에서와 같이 반구와 반구를 접착하여 속공을 제조할 때 종종 발생되는 접착 불량도 일어날 수 없으며 그로 인한 테니스공 표면의 휄트는 마모가 얼마 되지 않았는데도 반구 접착부위가 터져 사용할 수 없게 되는 경우도 일어나지 않는다. 본 발명에서는 속공에 수지의 혼합물과 기포가 꽉 차 있으므로 절대로 터지지 않아 테니스공 표면의 휄트가 수명이 다 할 때까지 사용할 수 있으므로 매우 경제적이다.In addition, as in the conventional method, the adhesion failure that often occurs when manufacturing the fastball by adhering the hemisphere and the hemisphere may not occur, and the resultant bolt on the tennis ball surface may be unusable due to the hemisphere adhesive site bursting. The case does not happen either. In the present invention, since the mixture and the bubble of the resin is filled in the fast hole, it never breaks, so the bolt on the surface of the tennis ball can be used until the end of its life, which is very economical.
본 발명에서는 수지 발포의 셀의 크기, 경도를 조정하여 테니스공의 바운드와 속력을 조절하여 테니스를 처음 시작하는 초보자나 노약자들이 편하게 쉽게 배울 수 있고 즐겁게 경기를 할 수 있는 효과를 줄 수 있다.In the present invention, by adjusting the size and hardness of the resin foam cells, it is possible to adjust the bounds and speed of the tennis ball for beginners or the elderly who start tennis for the first time, and can easily learn and enjoy the game.
그러므로 부담없이 가족들(부모, 부부, 자녀) 3대가 쉽게 한 코트에서 용이하게 즐길 수 있다.Therefore, three families (parents, couples, children) can easily enjoy on one court easily.
또한, 어린이들의 경식 야구공으로도 대체할 수 있으며, 여기에 적합한 다음과 같은 특징이 있다.In addition, it can be replaced with a children's hard baseball, and has the following characteristics suitable for this.
- 볼이 깨지지 않는다.-The ball does not break.
- 볼이 소프트하여 몸에 맞아도 부상당할 염려가 없다.-The ball is soft, so you don't have to worry about getting injured.
- 반발력이 적어 타구 시 멀리 가지도 않고 그러므로 캐치할 때 튕겨 나갈 염려 없으므로 협소한 놀이터에서도 즐길 수 있다.-Because of low repulsion, you don't go far when hitting and therefore you don't have to worry about throwing it away when you catch it.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019990023063A KR100329725B1 (en) | 1999-06-18 | 1999-06-18 | Non-pressure Tennis Ball |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019990023063A KR100329725B1 (en) | 1999-06-18 | 1999-06-18 | Non-pressure Tennis Ball |
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| Publication Number | Publication Date |
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| KR20010002975A KR20010002975A (en) | 2001-01-15 |
| KR100329725B1 true KR100329725B1 (en) | 2002-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| KR1019990023063A KR100329725B1 (en) | 1999-06-18 | 1999-06-18 | Non-pressure Tennis Ball |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7985779B2 (en) | 2007-07-20 | 2011-07-26 | Invista North America S.A.R.L. | Manufacture of polyurethane foam ball |
| US10286259B2 (en) | 2015-08-31 | 2019-05-14 | Mark Hartelius | Play ball with foam filling |
| US11192001B2 (en) * | 2020-02-11 | 2021-12-07 | Wilson Sporting Goods Co. | Tennis ball having a thermoplastic core |
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- 1999-06-18 KR KR1019990023063A patent/KR100329725B1/en not_active IP Right Cessation
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