EP3025768B1 - Procédé de stockage de billes creuses - Google Patents

Procédé de stockage de billes creuses Download PDF

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Publication number
EP3025768B1
EP3025768B1 EP14837497.8A EP14837497A EP3025768B1 EP 3025768 B1 EP3025768 B1 EP 3025768B1 EP 14837497 A EP14837497 A EP 14837497A EP 3025768 B1 EP3025768 B1 EP 3025768B1
Authority
EP
European Patent Office
Prior art keywords
temperature
balls
ball
hollow
hollow ball
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP14837497.8A
Other languages
German (de)
English (en)
Other versions
EP3025768A1 (fr
EP3025768A4 (fr
Inventor
Hironori Takihara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Rubber Industries Ltd
Original Assignee
Sumitomo Rubber Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Rubber Industries Ltd filed Critical Sumitomo Rubber Industries Ltd
Publication of EP3025768A1 publication Critical patent/EP3025768A1/fr
Publication of EP3025768A4 publication Critical patent/EP3025768A4/fr
Application granted granted Critical
Publication of EP3025768B1 publication Critical patent/EP3025768B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B47/00—Devices for handling or treating balls, e.g. for holding or carrying balls
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B47/00—Devices for handling or treating balls, e.g. for holding or carrying balls
    • A63B47/005—Ball heating devices
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B71/00—Games or sports accessories not covered in groups A63B1/00 - A63B69/00
    • A63B71/0036—Accessories for stowing, putting away or transporting exercise apparatus or sports equipment
    • A63B71/0045—Accessories for stowing, putting away or transporting exercise apparatus or sports equipment specially adapted for games played with rackets or bats
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2102/00—Application of clubs, bats, rackets or the like to the sporting activity ; particular sports involving the use of balls and clubs, bats, rackets, or the like
    • A63B2102/02—Tennis
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2225/00—Miscellaneous features of sport apparatus, devices or equipment
    • A63B2225/64—Heated
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2225/00—Miscellaneous features of sport apparatus, devices or equipment
    • A63B2225/66—Cooled

Definitions

  • the present invention relates to methods for storing hollow balls such as regulation tennis balls, soft tennis balls, and the like.
  • the internal pressures of the balls are kept higher than the atmospheric pressure.
  • the internal pressure of a regulation tennis ball is set to be about 1.8 times of the atmospheric pressure. If a ball has an internal pressure higher than this, a user feels that the ball is too hard or flies too far. If a ball has an internal pressure lower than this, the user feels that the ball is too soft or does not fly well.
  • a hollow ball needs to be manufactured such that the internal pressure thereof has an appropriate value, and the internal pressure of the manufactured ball needs to be kept in an appropriate range.
  • the ball includes a core which is a hollow sphere made of rubber; and two felt portions (also referred to as "melton") which cover the surface of the core.
  • the core is obtained by attaching together two half shells.
  • a tablet of ammonium chloride, a tablet of sodium nitrite, and water (or aqueous solutions thereof) are put into the core.
  • they are heated, so that ammonium chloride and sodium nitrite cause a chemical reaction.
  • Nitrogen gas is generated by the chemical reaction.
  • the internal pressure of the core is increased by the nitrogen gas.
  • the gas within the ball passes through an outer shell to come out of the ball due to the difference between the internal pressure and the atmospheric pressure. That is, even when a ball is manufactured so as to have an appropriate internal pressure, the internal pressure decreases over time. For example, when a regulation tennis ball is left in the atmospheric pressure for about two months, the internal pressure thereof decreases by 10% to 15% thereby to begin to affect playing such as "not bouncing well, poor feel at impact", or the like.
  • JP7-155406 JP7-187252 , and JP8-89600 .
  • These storage containers are all airtight containers. After tennis balls are housed in these containers, the air pressures within the containers are increased to a pressure higher than the atmospheric pressure. By decreasing the difference between the internal pressure of each tennis ball and the air pressure of each container outside the tennis ball, a speed at which the gas within the ball passes through an outer shell can be decreased. By eliminating the difference between the internal pressure of each tennis ball and the air pressure of the container, the gas within the ball does not come out. In other words, the internal pressure of the tennis ball does not decrease.
  • the air pressure within the container is increased to a pressure higher than the atmospheric pressure as described above.
  • the storage container is required to have strength to withstand the difference between the pressure within the container and the atmospheric pressure. For example, when the pressure within the container is made higher than the atmospheric pressure by 1.0 kgf/cm 2 , if the size of an inlet of the container is set at 300 mm for easily putting balls into the container, a force of about 700 kgf is applied to the inlet portion. The container that can withstand the force is increased in size, and the weight thereof is also increased. It is difficult to handle the container. The container is expensive. A method for storing a hollow ball easily at low cost is desired. US 2013/0098936 A1 describes a refrigerating cabinet for the automatic dispensing of sports balls stored in a uniform environment.
  • An object of the present invention is to provide a method for storing a hollow ball easily at low cost.
  • Such a method for storing a hollow ball according to the present invention includes the steps of:
  • the temperature of the hollow ball is increased after the step (3).
  • the temperature of the hollow ball is increased to a temperature exceeding a dew point of the external air.
  • the temperature of the hollow ball is equal to or lower than 10°C.
  • the temperature of the hollow ball is equal to or lower than 0°C.
  • the temperature of the hollow ball is equal to or lower than -10°C.
  • the temperature of the hollow ball is decreased to the temperature lower than the temperature of the external air.
  • the hollow ball is stored in a state of being cooled. Under the low temperature, the permeability of gas relative to the outer shell of the hollow ball decreases. Thus, the speed at which the gas within the ball comes out of the ball is lower than that at normal temperature. Therefore, the internal pressure of the hollow ball can be maintained for a long period of time as compared to a conventional method for storing the ball at normal temperature. According to this method, it is possible to easily store the hollow ball without using a pressure container.
  • FIG. 1 shows an apparatus for a method for storing a hollow ball according to an exemplary embodiment.
  • the apparatus is a refrigerator 2.
  • the interior of the refrigerator 2 is a housing portion 6 which houses hollow balls 4 each of which includes an outer shell and a space surrounded by the outer shell.
  • the refrigerator 2 includes a main body 8 and a lid 10.
  • the main body 8 has, at an upper portion thereof, an input port for putting in the hollow balls 4 therethrough.
  • the refrigerator 2 keeps the internal temperature thereof low.
  • the refrigerator 2 typically cools the interior thereof by electric power.
  • the refrigerator 2 may cool the interior thereof by having ice therein.
  • the hollow balls 4 are put into the housing portion 6 of the refrigerator 2.
  • the lid 10 of the refrigerator 2 is opened, the hollow balls 4 are put into the main body 8 through the input port of the main body 8, and the lid 10 is closed.
  • the hollow balls 4 are cooled in the housing portion 6 of the refrigerator 2 to a temperature lower than the temperature of the external air.
  • the hollow balls 4 are stored in a state where the hollow balls 4 are cooled to the temperature lower than the temperature of the external air.
  • the hollow balls 4 are stored in a state of being cooled. Under the low temperature, the permeability of gas relative to the outer shell of each hollow ball 4 decreases. The speed at which the gas within the ball 4 comes out of the ball 4 is lower than that at normal temperature. Thus, the internal pressure of each hollow ball 4 can be maintained for a long period of time as compared to a conventional method for storing the balls 4 at normal temperature. According to this method, it is possible to easily store the hollow balls 4 without using a pressure container.
  • regulation tennis balls 4 are taken as an example, and the case of storing the balls 4 at normal temperature of 25°C and the case of storing the balls 4 while cooling the balls 4 to 10°C are compared as to the speed at which gas comes out of the interior of each ball 4.
  • the outer shell of each regulation tennis ball 4 is generally made from natural rubber.
  • the gas within each regulation tennis ball 4 is generally composed of nitrogen gas (N 2 ) and oxygen gas (O 2 ) , similarly to the atmosphere.
  • Carbon dioxide gas (CO 2 ) is also present in the interior of each regulation tennis ball 4 and the atmosphere, but the amount thereof is negligibly small.
  • the speed V at which the gas passes through the film is proportional to the permeability coefficient Cp of the gas for the film.
  • the permeability coefficient Cp of each of nitrogen gas and oxygen gas for the outer shell at a temperature of 10°C is substantially 1/2 of the permeability coefficient Cp thereof at a temperature of 25°C.
  • the partial pressure difference P also decreases as the temperature decreases, but the effect of the partial pressure difference P on the speed V is less than that of the permeability coefficient.
  • the thickness W of the film does not change in response to the temperature. Therefore, by cooling the balls 4 at 25°C to 10°C, the speed V at which each of nitrogen gas and oxygen gas passes through the outer shell of each ball 4 becomes substantially 1/2 due to the effect of the temperature dependency of the permeability coefficient Cp.
  • the speed at which the gas within the tennis ball 4 comes out of the tennis ball 4 is lower than the speed at which the gas within the tennis ball 4 at normal temperature comes out of the tennis ball 4.
  • the internal pressure of each of the tennis balls 4 can be maintained for a long period of time as compared to storing the balls 4 at normal temperature. In this method, a decrease in the internal pressure of each tennis ball 4 can be controlled without using a pressure container.
  • the gas of which the permeability coefficient for a film such as rubber or the like decreases as the temperature decreases is not limited to nitrogen gas and oxygen gas.
  • the permeability coefficient of a gas passing through a film decreases as the temperature decreases.
  • the present method is effective also for hollow balls 4 filled with a gas other than nitrogen gas and oxygen gas.
  • the storage temperature for the hollow balls 4 is preferably equal to or lower than 10°C. From this standpoint, the storage temperature for the hollow balls 4 is more preferably equal to or lower than 0°C and further preferably equal to or lower than -10°C.
  • FIG. 2 shows an apparatus for a method for storing hollow balls according to the present invention.
  • the apparatus includes a refrigerator 11 and a bag 12.
  • the bag 12 houses hollow balls 14.
  • the bag 12 is typically made from a resin composition.
  • the bag 12 has an input port for putting in the hollow balls 14 therethrough.
  • the input port is provided with a zipper 16. By closing the zipper 16, the bag 12 is kept airtight.
  • the interior of the refrigerator 11 is a housing portion 18 which houses the bag 12 in which the hollow balls 14 are put.
  • the refrigerator 11 includes a main body 20 and a lid 22.
  • the main body 20 has, at an upper portion thereof, an input port for putting in the hollow balls 14 therethrough.
  • the refrigerator 11 keeps the internal temperature thereof low.
  • the refrigerator 11 typically cools the interior thereof by electric power.
  • the refrigerator 11 may cool the interior thereof by having ice therein.
  • the hollow balls 14 are housed in the housing portion 18 of the refrigerator 11.
  • the hollow balls 14 are put into the bag 12.
  • the zipper 16 of the bag 12 is closed.
  • the bag 12 is put into the refrigerator 11.
  • the lid 22 of the refrigerator 11 is opened, the bag 12 is put into the main body 20 through the input port of the main body 20, and the lid 22 is closed.
  • the hollow balls 14 are cooled in the interior of the refrigerator 11 to a temperature lower than the temperature of the external air.
  • the hollow balls 14 are stored in a state where the hollow balls 14 are cooled to the temperature lower than the temperature of the external air.
  • the bag 12 in which the hollow balls 14 have been put is taken out from the refrigerator 11, so that the temperature of each hollow ball 14 is increased. Thereafter, the hollow balls 14 are taken out from the bag 12 and used.
  • the hollow balls 14 are stored in a state of being cooled. Under the low temperature, the permeability of gas relative to the outer shell of each hollow ball 14 decreases. The speed at which the gas comes out of the interior of the ball 14 is lower than that at normal temperature. Thus, the internal pressure of each hollow ball 14 can be maintained for a long period of time as compared to a conventional method for storing the balls 14 at normal temperature. According to this method, it is possible to easily store the hollow balls 14 without using a pressure container.
  • each ball 14 When the hollow balls 14 that have been stored at the low temperature are exposed directly to the atmosphere, dew condensation may occur on the surface of each ball 14.
  • felt portions cover the surface. If each ball 14 is used in a state where the felt portions contain water generated due to dew condensation, yarns that form the felt portions are twisted, so that irregularities can occur on the surface. The tennis ball 14 can be no longer used.
  • the hollow balls 14 are exposed to the atmosphere while being housed in the bag 12 before being used. Thus, dew condensation occurs on the surface of the bag 12. Since the airtightness of the bag 12 is ensured, water does not adhere to the surface of each ball 14. Then, after the temperature of each hollow ball 14 is increased, the hollow balls 14 are taken out from the bag 12. Thus, the amount of dew condensation occurring on the surface of each hollow ball 14 can be decreased. In this method, occurrence of twist of the felt is suppressed.
  • the temperature of each hollow ball 14 is preferably increased to a temperature exceeding the dew point of the external air.
  • the principal component of the base resin of the resin composition of the bag 12 is preferably nylon or polyethylene.
  • the bag 12 is housed in the refrigerator 11.
  • the hollow balls 14 may not be housed in the bag 12.
  • the hollow balls 14 may be housed directly in the refrigerator 11. In this case, before the hollow balls 14 are used, for example, by increasing the temperature within the refrigerator 11, the temperature of each hollow ball 14 is increased. After the temperature of each hollow ball 14 is increased, the hollow balls 14 are taken out, whereby dew condensation can be prevented from occurring on the surface of each hollow ball 14. According to this method, occurrence of twist of the felt can be suppressed even without using the bag 12.
  • the present method is used when hollow balls are transported.
  • the hollow balls are housed in the interior of a freezing container which is a housing portion.
  • the hollow balls are cooled in the interior of the freezing container to a temperature lower than the temperature of the external air.
  • the hollow balls are stored and transported in a state where the hollow balls are cooled to the temperature lower than the temperature of the external air.
  • the hollow balls produced in a factory are shipped to a remote place such as a foreign country or the like, the hollow balls may be transported over several weeks.
  • sets of several balls are generally put in pressurized containers, such as steel cans and the like, and transported, in order to suppress a decrease in the internal pressure of each ball.
  • pressurized containers are opened and discarded immediately after the pressurized containers are delivered.
  • a manufacturer opens pressurized containers immediately before delivery of the pressurized containers to a user and then delivers only balls to the user in some cases.
  • the hollow balls are stored in the interior of the freezing container in a state where the hollow balls are cooled. Under the low temperature, the permeability of gas relative to the outer shell of each hollow ball decreases. The speed at which the gas comes out of the interior of each ball is lower than that at normal temperature. Thus, the internal pressure of each hollow ball can be maintained for a long period of time as compared to a conventional method for storing the balls at normal temperature. According to this method, no pressurized container is needed. According to this method, at the time of transportation, it is not necessary to put balls into a pressurized container in a sealed manner. In addition, it is also not necessary to open a pressurized container before delivery of balls to a user. In this method, the transportation cost can be reduced. In this method, waste matters which are pressurized containers are also not generated. In this method, consumption of resources is reduced.
  • Embodiments of the present invention are not limited to the three types described here.
  • the kind of apparatus for cooling hollow balls and whether to use the bag, and the like can be determined and combined as appropriate according to a use purpose of the present method.
  • Example 1 the apparatus shown in FIG. 1 was prepared, and a method for storing hollow balls was executed under the conditions shown in Table 1.
  • the hollow balls commercially-available regulation tennis balls were used.
  • the initial internal pressure of each of the regulation tennis balls is 1.8 kgf/cm 2 .
  • the outer shell of each of the tennis balls is made from natural rubber. These balls were put into a refrigerator of which the internal temperature can be adjusted.
  • "average external air temperature” is the average temperature of the external air during a period when the balls were stored.
  • “Playing temperature” is the temperature of the external air when tennis is played by using the balls after end of the storage period.
  • Ball temperature increasing treatment indicates whether a treatment for increasing the temperature of each ball to a temperature exceeding the dew point of the atmosphere was performed before taking out the balls from the refrigerator after the end of the storage period. “No” indicates that the treatment was not performed, and “Yes” indicates that the treatment was performed. In Example 1, the ball temperature increasing treatment was not performed.
  • Comparative Example 1 is the same as Example 1, except the storage temperature for the balls was not adjusted and the balls were stored at the same temperature as the temperature of the external air.
  • Examples 2 and 3 are the same as Example 1, except the storage temperature for the balls was as shown in Table 1.
  • Examples 4 to 6 are the same as Example 1, except the storage temperature for the balls was as shown in Table 1 and the ball temperature increasing treatment was performed.
  • Example 1 Example 2
  • Example 3 Example 4
  • Example 5 Example 6 Average external air temperature [°C] 23 23 23 23 23 23 23 23 23 23 23 23 Storage temperature [°C] 23 10 0 -10 10 0 -10 Playing temperature [°C] 25 25 25 25 25 25 25 25 25 25 25
  • Ball temperature increasing treatment No No No No Yes Yes Yes Yes
  • Internal pressure decrease [kgf / cm 2 ] 0.12 0.06 0.04 0.03 0.06 0.04 0.03 Felt twist A
  • the method described above can be used for storing various hollow balls.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Packages (AREA)
  • Packaging Of Annular Or Rod-Shaped Articles, Wearing Apparel, Cassettes, Or The Like (AREA)

Claims (5)

  1. Procédé pour stocker une bille creuse (14), le procédé comprenant les étapes consistant à :
    (1) placer une bille creuse (14) incluant une coque extérieure et un espace entouré par la coque extérieure, jusque dans d'une portion de boîtier (18), dans lequel la bille creuse (14) est logée dans un sac (12) dans la portion de boîtier (18) ;
    (2) diminuer une température de la bille creuse (14) jusqu'à une température plus basse qu'une température de l'air extérieur ; et
    (3) stocker la bille creuse (14) dans un état dans lequel la température de la bille creuse (14) est rendue plus basse que la température de l'air extérieur ;
    (4) augmenter la température de la bille creuse (14) après l'étape (3) ; et
    (5) ensuite, enlever la bille creuse (14) hors du sac (12).
  2. Procédé selon la revendication 1, dans lequel, dans l'étape (4), la température de la bille creuse (14) est augmentée jusqu'à une température qui dépasse un point de rosée de l'air extérieur.
  3. Procédé selon la revendication 1 ou la revendication 2, dans lequel, dans l'étape (3), la température de la bille creuse (14) est égale ou inférieure à 10°C.
  4. Procédé selon la revendication 3, dans lequel, dans l'étape (3), la température de la bille creuse (14) est égale ou inférieure à 0°C.
  5. Procédé selon la revendication 4, dans lequel, dans l'étape (3), la température de la bille creuse (14) est égale ou inférieure à -10°C.
EP14837497.8A 2013-08-20 2014-05-20 Procédé de stockage de billes creuses Not-in-force EP3025768B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013170012A JP6257025B2 (ja) 2013-08-20 2013-08-20 中空ボールの保存方法
PCT/JP2014/063314 WO2015025567A1 (fr) 2013-08-20 2014-05-20 Procédé de stockage de billes creuses

Publications (3)

Publication Number Publication Date
EP3025768A1 EP3025768A1 (fr) 2016-06-01
EP3025768A4 EP3025768A4 (fr) 2017-04-05
EP3025768B1 true EP3025768B1 (fr) 2020-10-07

Family

ID=52483352

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14837497.8A Not-in-force EP3025768B1 (fr) 2013-08-20 2014-05-20 Procédé de stockage de billes creuses

Country Status (4)

Country Link
EP (1) EP3025768B1 (fr)
JP (1) JP6257025B2 (fr)
CN (1) CN105473195A (fr)
WO (1) WO2015025567A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE8815709U1 (de) * 1988-12-19 1989-02-16 Wagner, Manfred Koffer, insbesondere für Minigolfbälle
JP2906956B2 (ja) 1993-12-10 1999-06-21 ブリヂストンスポーツ株式会社 テニスボール容器
JP3474909B2 (ja) 1993-12-24 2003-12-08 株式会社クラレ 加圧体容器
JPH07195371A (ja) * 1993-12-29 1995-08-01 Sumitomo Rubber Ind Ltd ゴム成形物の製造方法
JPH0889600A (ja) 1994-09-26 1996-04-09 Ee:Kk テニスボール用保存容器
JP3580401B2 (ja) * 1998-03-30 2004-10-20 住友ゴム工業株式会社 硬質テニスボールの包装方法
JP2006255549A (ja) * 2005-03-16 2006-09-28 Hitachi Koki Co Ltd 遠心分離機
DE202007001913U1 (de) * 2007-02-09 2007-05-16 Sack, Norbert Wärmekoffer mit Temperaturregelung und eigener Stromversorgung zum Transport von Minigolfbällen/Gegenständen
FR2959336B1 (fr) * 2010-04-22 2012-06-29 Gerard Kuma Armoire de distribution automatique de balles de tennis refrigerante
CN102918621B (zh) * 2010-05-28 2015-11-25 艾克塞利斯科技公司 主动露点感测和载荷锁定排气以避免在工件上凝结
JP5740923B2 (ja) * 2010-11-10 2015-07-01 凸版印刷株式会社 包装袋に気体を封入する方法
US20130043158A1 (en) * 2011-08-17 2013-02-21 Cobra Golf Incorporated Modular golf club case
US8616270B2 (en) * 2012-03-03 2013-12-31 Ralph Samuel Granchelli, JR. Tennis ball conditioner

Non-Patent Citations (1)

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Title
None *

Also Published As

Publication number Publication date
JP2015037510A (ja) 2015-02-26
WO2015025567A1 (fr) 2015-02-26
CN105473195A (zh) 2016-04-06
JP6257025B2 (ja) 2018-01-10
EP3025768A1 (fr) 2016-06-01
EP3025768A4 (fr) 2017-04-05

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