JP5458423B2 - ball - Google Patents

Description

  The present invention relates to a ball used in, for example, ball games.

  Conventionally, for example, a soccer ball or the like includes a core portion made of a tube and a plurality of skin panels provided so as to cover the core portion (see, for example, Patent Document 1). Each skin panel has a resinous skin material constituting the outermost layer of the ball and a foam material provided on the back side of the skin material. The foam material is made of polyurethane foam.

  Patent Document 1 discloses a method for manufacturing a skin panel. That is, first, a skin material is previously molded, and this skin material is placed in a cavity of a molding die for foaming material molding. Then, a polyurethane foam material is injected into the cavity. The foamed material undergoes a chemical change in the cavity due to atmospheric environment such as heat and pressure, expands while foaming, and is integrated with the skin material, thereby obtaining a skin panel.

JP 2004-174256 A

  However, when the polyurethane foam material is foamed in the cavity when the foam material is molded as in Patent Document 1, the atmosphere environment to which the polyurethane foam material is exposed during the foaming process varies depending on the part. In addition, it is difficult to always keep the atmosphere environment constant. Therefore, it is difficult to uniformize the foamed state of the foamed material because the degree of progress of the chemical change of the polyurethane foam material varies depending on the part or differs for each molding cycle. If the foamed state is not nearly uniform, the ball is distorted and the hardness varies depending on the part of the ball. For this reason, the outer shape of the ball is not as designed and difficult to handle for the user, and when the user kicks, for example, the user feels uncomfortable with how to fly, roll, or bite into the leg, and rebound is not good. It becomes natural and the feeling of use of the ball gets worse.

  The present invention has been made in view of such a point, and an object of the present invention is to suppress distortion of the ball by bringing the foamed state of the foamed material between the core portion and the skin material close to uniform. At the same time, it is intended to make the hardness uniform and thereby obtain a ball having a good feeling of use.

To achieve the above object, the present onset Ming, a core portion, while having a foam material provided on the outside of the core portion, and a skin material which is provided on the outside of the foam material, the skin material The foamed material is divided into a plurality of sheets, and the foamed material has a closed cell structure in which a thermosetting elastomer foam material is mechanically foamed using air, and is integrally formed on each back surface of the skin material. Is a ball bonded to the core part, and the skin material protrudes from the peripheral part of the body part toward the core part as a part constituting the outermost layer of the ball and the peripheral part of the body part And having a protruding wall portion made of a resin, the resin of the protruding wall portion is made of a softer resin than the resin of the main body portion, or the thickness of the protruding wall portion is That it was made thinner than the thickness of the main body Or the foam material has an inner part located on the side of the central part of the body part of the skin material and an outer part located on both sides of the peripheral part of the body part and the protruding wall part of the skin material. The foam material is characterized in that the inner part and the outer part are formed separately, or the foam material is characterized in that a large number of beads are mixed, or the core part of the foam material Or a concave portion or a concave portion is provided on the back surface of the skin side, or the resin of the body portion of the skin material is translucent, while being located on the core side of the body portion of the skin material It is characterized in that a film printed with characters or patterns is provided on the back surface, or the protruding wall part is separated from the core part, or the protruding wall part is separated from the core part. A foam material that is separated from the above foam material is provided in a portion separated from the core portion of the protruding wall portion. To.

According to this invention, or a resin of the protruding wall portion is either constituted by a softer resin than the resin of the main body portion, or the thickness of the protruding wall portion is configured thinner than the thickness of the body portion, or, foam The material comprises an inner part located on the side of the central part of the body part of the skin material and an outer part located on both sides of the peripheral part of the body part and the protruding wall part of the skin material. Are formed separately, or a large number of beads are mixed in the foam material, or the back surface on the core side of the foam material is provided with irregularities or recesses, or the surface of the skin material While the resin of the main body part is translucent, a film on which characters or patterns are printed is provided on the back surface located on the core part side of the main body part of the skin material, or the protruding wall part extends from the core part. A part where the protruding wall part is separated from the core part and away from the core part of the protruding wall part. Since the above foamed material provided with foaming material separate, it is possible to suppress the distortion of the ball, can be avoided hardness by site of the ball differs from. As a result, when the ball is kicked, for example, how to fly, how to roll, and the feeling of biting into the legs become natural, rebound also becomes natural, and a ball with a good feeling of use can be obtained.

1 is an external view of a ball according to Embodiment 1. FIG. It is sectional drawing in the II-II line of FIG. It is sectional drawing of the shaping | molding die which shape | molds the main-body part of a skin material. FIG. 4 is a view corresponding to FIG. 3 in a state where a main body portion of a skin material is molded. FIG. 4 is a view corresponding to FIG. 3 in a state in which a body portion of the skin material is removed. It is sectional drawing of the shaping | molding die which shape | molds the protrusion wall part of a skin material. FIG. 7 is a view corresponding to FIG. 6 in a state where the main body portion of the skin material is held. FIG. 7 is a view corresponding to FIG. 6 in a state where a protruding wall portion of the skin material is formed. FIG. 7 is a view corresponding to FIG. 6 in a state where the skin material is removed. It is a block diagram of a foaming material supply apparatus. It is sectional drawing of the shaping | molding die which shape | molds a foam material. FIG. 12 is a view corresponding to FIG. 11 during the molding of the foam material. It is FIG. 11 equivalent figure of the state which shape | molded the foaming material. FIG. 3 is a diagram corresponding to FIG. 2 according to a first modification of the first embodiment. FIG. 3 is a diagram corresponding to FIG. 2 according to a second modification of the first embodiment. FIG. 9 is a view corresponding to FIG. 2 according to a third modification of the first embodiment. FIG. 6 is a view corresponding to FIG. 2 according to a fourth modification of the first embodiment. FIG. 9 is a view corresponding to FIG. 2 according to a fifth modification of the first embodiment. FIG. 9 is a view corresponding to FIG. 2 according to Modification 6 of Embodiment 1. FIG. 9 is a view corresponding to FIG. 2 according to Modification Example 7 of Embodiment 1. FIG. 9 is a diagram corresponding to FIG. 2 according to a modification 8 of the first embodiment. FIG. 10 is a view corresponding to FIG. 2 according to Modification 9 of Embodiment 1. It is a top view of the skin panel which concerns on the modification 10 of Embodiment 1. FIG. It is sectional drawing in the XXIV-XXIV line | wire of FIG. FIG. 3 is a diagram corresponding to FIG. 2 of the second embodiment. It is a figure explaining the state which has apply | coated the foaming material to the reinforcing material surface of a tube. It is a side view of the state which provided the foaming material on the reinforcing material surface of the tube.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

(Embodiment 1)
FIG. 1 shows a ball 1 according to Embodiment 1 of the present invention. This ball 1 is for ball games, and as shown in FIG. 2, a tube 2 as a core and a plurality of skin panels 3, 3,... Constituting a skin covering the outer peripheral surface of the tube 2 are provided. I have. In this embodiment, the number of the skin panels 3 is twelve. Therefore, the area of each skin panel 3 is 8% or more of the total surface area of the balls 1. The diameter of the ball 1 is set to 16 cm or more and 25 cm or less. The number of skin panels 3 and the diameter of the balls 1 are not limited to the above.

  The tube 2 is made of an air-impermeable elastic material such as butyl rubber or latex rubber, and has a rubber valve 4 having a known structure as shown in FIG. The valve 4 penetrates the skin panel 3 and is exposed on the outer surface of the ball 1. Compressed air is injected into the tube 2 through the valve 4. The structure of the valve 4 is not limited to the above.

  The tube 2 is provided with a reinforcing layer 5. The reinforcing layer 5 is in close contact with the outer peripheral surface of the tube 2. The reinforcing layer 5 is composed of a cloth or a thread bonded to the tube 2. Note that the reinforcing layer 5 may be omitted, or may be composed of a member other than cloth or yarn.

  The shape of the skin panel 3 is a pentagon or a hexagon. The skin panel 3 has a curved shape as a whole along the outer peripheral surface shape of the tube 2. The skin panel 3 has a two-layer structure including a skin material 10 constituting the outermost layer of the ball 2 and a foam material 11 provided on the back side of the skin material 10. That is, the ball 1 has a structure including a tube 2, a foam material 11 provided outside the tube 2, and a skin material 10 provided outside the foam material 11.

  The skin material 10 is an injection molded product formed by injection molding a resin material such as polyurethane, polycarbonate, polypropylene, polyamide, polyvinyl chloride, or the like. The skin material 10 is formed by integrating a curved plate-like main body portion 10a and a protruding wall portion 10b protruding from the peripheral edge portion of the main body portion 10a toward the back side. The thickness of the main body 10a is the same throughout, and is set in the range of 0.01 mm to 3.00 mm, for example. The protruding wall portion 10 b has an annular shape that is continuous over the entire circumference of the skin material 10. The thickness of the protruding wall portion 10b is set to be the same as the thickness of the main body portion 10a. The protruding end portion of the protruding wall portion 10 b is in contact with the reinforcing layer 5 of the tube 2. The main body 10a and the protruding wall 10b may be formed of the same resin material or different resin materials. In the case of forming with different resin materials, it is preferable to soften the resin material forming the protruding wall portion 10b. By doing so, the rigidity of the protruding wall portion 10b is reduced, and the hardness of the ball 1 can be made uniform throughout.

  The foam material 11 is obtained by mechanical foaming of a foam material containing urethane resin or the like. The foam material 11 is bonded to the back surface of the main body portion 10 a of the skin material 10 and the inner surface of the protruding wall portion 10 b and is integrated with the skin material 10. ing. The thickness of the foam material 11 is set to be substantially the same as the projecting height of the projecting wall portion 10b throughout, and the back surface of the foam material 11 has a curved shape similar to the shape of the main body portion 10a of the skin material 10. It has become. The mechanical foaming refers to foaming the raw material so that a cell-like structure is obtained by introducing gas into the raw material by physical means. The means for introducing gas into the raw material is as follows. In addition to the pressure unit, for example, there is a stirring unit.

  The back surface of the foam material 11 is bonded to the reinforcing layer 5 of the tube 2 with an adhesive (not shown). Further, of the skin panels 3 and 3 adjacent to each other on the tube 2, the outer surfaces of the protruding wall portions 10 b of the skin material 10 are bonded to each other with an adhesive (not shown).

  Next, a manufacturing apparatus for manufacturing the skin panel 3 will be described. This manufacturing apparatus includes a body part molding device that molds the body part 10a of the skin material 10, a protruding wall part molding device that molds the protruding wall part 10b of the skin material 10, and a foam material molding apparatus that molds the foam material 11. It consists of

  The main body molding apparatus includes an injection molding machine (not shown) and a molding die 20 (shown in FIG. 3). The injection molding machine is a well-known machine configured to knead a resin material into a molten state and inject it from a nozzle. On the other hand, the molding die 20 has an upper die 21 and a lower die 22 arranged so as to be opposed to each other vertically, and a die driving device (not shown) that moves the upper die 21 in the up-down direction to make contact with and away from the lower die 22. ). On the lower surface of the upper mold 21, a surface side molding surface 21a for molding the surface side of the main body 10a is formed. The surface side molding surface 21 a is curved upward to form the curved shape of the skin material 10. On the upper surface of the lower mold 22, a back side molding surface 22a for molding the back side of the main body 10a is formed. This back side molding surface 22a is similarly curved. When the upper mold 21 and the lower mold 22 are clamped, a cavity (not shown) is formed by the front side molding surface 21a and the back side molding surface 22a. Although not shown, the lower mold 22 is formed with a runner communicating with the nozzle of the injection molding machine. The downstream end of the runner is connected to a gate that opens into the cavity.

  The protruding wall part molding apparatus includes an injection molding machine similar to the main body part molding apparatus and a molding die 25 (shown in FIG. 6). The molding die 25 includes an upper die 26 and a lower die 27, and a die driving device (not shown). A curved surface 26 a corresponding to the surface shape of the main body 10 a is formed on the lower surface of the upper mold 26. The peripheral portion of the curved surface 26a is formed to extend outward from the peripheral portion of the main body portion 10a, and a part of the protruding wall portion 10b is formed by the peripheral portion of the curved surface 26a. Yes. On the upper surface of the lower mold 27, a curved surface 27a corresponding to the back surface shape of the main body portion 10a is formed. The curved surface 27a is raised by one step compared to the outer peripheral portion of the upper surface of the lower mold 27, and the remaining portion of the protruding wall portion 10b is formed by this step portion. When the upper die 26 and the lower die 27 are clamped, the main body portion 10a is sandwiched between the curved surfaces 26a and 27a in the front and back direction, and further, for the protruding wall portion 10b so as to surround the main body portion 10a. A cavity is formed. The lower mold 27 is provided with a runner and a gate.

  In addition, you may comprise the said shaping | molding die 20 and 25 with the type | mold which contacts / separates in the left-right direction. Further, the runner and the gate may be provided in either type. Further, the position and shape of the gate and runner can be set arbitrarily.

  The foaming material forming apparatus includes a foaming material supply device 30 shown in FIG. 10 and a forming die 50 shown in FIG. The foam material supply device 30 includes a gas supply device 31, a material supply device 32, a gas introduction device 33, a control unit 34, a pressurization device 35, a dispersion device 36, and a discharge device 37.

The gas supply device 31 includes a connection pipe 31a connected to the compressor and the cylinder A, a known pressure regulating valve 31b, a gas flow meter 31c, and a gas supply pipe 31d. The compressed gas introduced into the connection pipe 31a is adjusted in pressure and then flows through the gas supply pipe 31d. The pressure of the gas supplied by the gas supply device 31 can be adjusted in a low pressure region of, for example, 0.1 to 5.0 kg / cm ² . In addition, in the gas-body supplies, it is air.

The material supply device 32 includes a follower plate type plunger pump 32a and a material supply pipe 32b connected to a discharge pipe of the plunger pump 32a. The suction pipe of the plunger pump 32a is inserted into a container B in which a thermosetting urethane foam material is stored. The thermosetting foamed urethane material in the container B is delivered to the material supply pipe 32b by the plunger pump 32a. The delivery pressure of this urethane material can be adjusted, for example, in a high pressure region of 100 to 300 kg / cm ² .

  The gas introduction device 33 includes a first piston pump 33a and a second piston pump 33b, valves 33c to 33h, and motors M1 and M2. The first and second piston pumps 33a and 33b are configured to perform a suction stroke and a discharge stroke by reciprocating the pistons by motors M1 and M2, respectively. The downstream side of the gas supply pipe 31d is branched into two, and each is connected to the suction pipes of the first and second piston pumps 33a and 33b. Further, the downstream side of the material supply pipe 32b is also branched into two, and each is connected to the suction pipes of the first and second piston pumps 33a and 33b. Accordingly, the gas flowing through the gas supply pipe 31d and the urethane material flowing through the material supply pipe 32b are introduced into the first and second piston pumps 33a and 33b. Valves 33c to 33f are provided on the downstream side of the branch portion of the gas supply pipe 31d and on the downstream side of the branch portion of the material supply pipe 32b, respectively. Further, valves 33g and 33h are provided in the discharge pipes of the first and second piston pumps 33a and 33b, respectively.

  The motors M1 and M2 and the valves 33c to 33h are controlled by the control unit 34. Specifically, gas is allowed to flow into the cylinders of the first and second piston pumps 33a and 33b during the suction stroke, and then the urethane material is allowed to flow after the suction stroke. Shifting to the discharge stroke, gas and urethane material are delivered to the discharge pipe.

  The pressurizing device 35 includes a first piston pump 35a and a second piston pump 35b, valves 35c to 35f, and motors M3 and M4. In the first and second piston pumps 35a and 35b, the pistons are reciprocated by motors M3 and M4, respectively, so that the suction stroke and the discharge stroke are performed. The valve 35c is provided in the suction pipe of the first piston pump 35a, and the valve 35d is provided in the suction pipe of the second piston pump 35b. The valve 35e is provided in the discharge pipe of the first piston pump 35a, and the valve 35f is provided in the discharge pipe of the second piston pump 35b.

The motors M3 and M4 and the valves 35c to 35f are controlled by the control unit 34. Specifically, when the first piston pump 35a is operated, first, with the valve 35c opened and the valve 35e closed, the piston is moved and the mixture sent from the gas introduction device 33 as an intake stroke is transferred into the cylinder. Inhale. In this state, with the valve 35c closed and the valve 35e opened, the piston is moved to deliver the mixture in the cylinder to the discharge pipe as a discharge stroke. The second piston pump 35b operates similarly. The discharge pressure of the mixture from the first and second piston pumps 35a and 35b is 150 kg / cm ² or more. The discharge pressure and flow rate of the mixture from the first and second piston pumps 35 a and 35 b can be changed by a signal from the control unit 34. The control unit 34 is provided with an operation panel (not shown) for performing various settings.

  The dispersion device 36 includes a dispersion pipe 36a connected to the discharge pipe, and a valve 36b that opens and closes the dispersion pipe 36a. The dispersion tube 36a is a thin tube having an inner diameter of 10 mm or less, and the length is set to about 10 m.

  The discharge device 37 includes a discharge tube 37a connected to the downstream side of the dispersion tube 36a of the dispersion device 36, and a valve built-in type nozzle 37b provided on the downstream side of the discharge tube 37a. In addition, the above-described foamed material supply device 30 is an example, and it is also possible to change each part.

  On the other hand, as shown in FIG. 11, the mold 50 includes an upper mold 51 and a lower mold 52, a heating device 53, and a mold driving device (not shown). On the lower surface of the upper mold 51, a back surface molding surface 51a for molding the back surface of the foamed material 11 is formed. The back side molding surface 51 a is curved downward to form the curved shape of the foam material 11. A concave surface 52a extending along the surface of the main body portion 10a of the skin material 10 and the outer surface of the protruding wall portion 10b is formed on the upper surface of the lower mold 52, and the skin material 10 is held by the concave surface 52a. ing. The heating device 53 includes an upper mold heater 53a disposed in the upper mold 51, a lower mold heater 53b disposed in the lower mold 52, and a control unit 53c connected to the heaters 53a and 53b. It is configured. The upper die heater 53a is accommodated in a hole formed in the upper die 51, and is constituted by, for example, a heating wire heater. The same applies to the lower mold heater 53b. These heaters 53a and 53b are controlled by the control unit 53c to adjust the temperatures of the back surface 51a of the upper mold 51 and the concave surface 52a of the lower mold 52 within a predetermined range.

  Next, the point which manufactures the skin panel 3 with the manufacturing apparatus comprised as mentioned above is demonstrated. First, as shown in FIGS. 3 to 5, the main body 10 a of the skin material 10 is formed by the main body forming apparatus. That is, with the upper mold 21 and the lower mold 22 clamped, the molten resin material is injected into the cavity from the nozzle of the injection molding machine (see FIG. 4). When the mold is opened after the resin material in the cavity is solidified, the main body 10a of the skin material 10 is obtained (see FIG. 5).

  Next, as shown in FIG. 6, the main body 10a is placed on the curved surface 27a of the lower mold 27 of the protruding wall forming apparatus, and the upper mold 26 and the lower mold 27 are clamped as shown in FIG. Then, the molten resin material is injected into the cavity from the nozzle of the injection molding machine. Then, as shown in FIG. 8, the molten resin material is molded in a state of being welded to the peripheral portion of the main body 10 a, and as shown in FIG. 9, when the mold is opened after solidification, the main body 10 a and the protruding wall 10 b Can be obtained. As described above, when the main body 10a and the protruding wall 10b are injection-molded, the resin material necessary for the molding need only be supplied to the cavities of the molding dies 20 and 25, so that there is almost no waste of the resin material. . Further, by molding the molten resin material with the molding dies 20 and 25, it is difficult to generate residual stress, and it is possible to obtain the skin material 10 with high accuracy.

  After that, as shown in FIG. 11, the skin material 10 is fitted into the concave surface 52a of the lower mold 52 of the foam molding apparatus. At this time, the temperature of the upper mold 51 and the lower mold 52 is increased to a temperature at which a foam material C described later is thermally cured, and is about 80 ° C., for example.

  And the foaming material C is supplied to the back surface of the skin material 10 as follows.

  That is, as shown in FIG. 10, in the foam material supply device 30, the gas supply device 31 and the material supply device 32 cause gas and urethane material to flow into the first and second piston pumps 33 a and 33 b of the gas introduction device 33. Supplied. As the urethane material, for example, a paste-like freely-molded elastomer foam material (penguin foam) manufactured by Sunstar Giken Co., Ltd. can be used. This foam material is a fluid one-component type. The urethane material is not limited to those described above, and is not particularly limited as long as it is a material capable of mechanical foaming.

  The first and second piston pumps 33a and 33b of the gas introduction device 33 operate separately. First, after the valve 33c is opened and the valves 33d and 33g are closed, a predetermined amount of gas is introduced into the cylinder of the first piston pump 33a during the suction stroke. Thereafter, after closing the valve 33c and opening the valve 33d, the urethane material is allowed to flow after the suction stroke. When a predetermined amount of urethane material is introduced, the valve 33g is opened while the valves 33c and 33d are both closed, and the discharge process is started, and the gas and the urethane material are sent to the discharge pipe. If the 1st piston pump 33a transfers to a discharge stroke, after making gas and urethane material flow into the cylinder of the 2nd piston pump 33b similarly, gas and urethane material will be sent out to a discharge pipe. That is, the gas introducing device 33 operates in a batch manner, and the mixture of the gas and the urethane material is alternately discharged from the first and second piston pumps 33a and 33b. Further, the ratio of the gas flowing into the cylinders of the piston pumps 33a and 33b and the urethane material is arbitrarily adjusted by the supply pressure by the gas supply device 31 and the material supply device 32, the opening / closing timing and the opening / closing amount of the valves 33c to 33f. It is possible.

The mixture discharged from the first and second piston pumps 33 a and 33 b is sucked into the first and second piston pumps 35 a and 35 b of the pressurizing device 35. That is, when the first piston pump 35a enters the suction stroke with the valve 35c opened and the valves 35e and 35d closed, the mixture is sucked into the cylinder. And if the 1st piston pump 35a transfers to a discharge stroke in the state which opened the valve 35e and closed the valve 35c, a mixture will be discharged. The pressure at this time is set to 150 kg / cm ² or more, and the flow rate is set to about 100 to 1000 ml / min. Similarly, the second piston pump 35b sucks and discharges the mixture. The first and second piston pumps 35a and 35b operate alternately.

The mixture discharged from the first and second piston pumps 35 a and 35 b of the pressurizing device 35 flows into the dispersion pipe 36 a of the dispersion device 36. Since the pressure of the mixture flowing into the dispersion pipe 36a is 150 kg / cm ² or more and the flow rate is set to about 100 to 1000 ml / min, the gas is fine while the mixture flows through the dispersion pipe 36a. Bubbles are dispersed almost uniformly in the urethane material. Thereby, the foam material C of the present invention is obtained. The average particle diameter of the bubbles is as fine as about 0.01 mm to 0.03 mm.

  The foam material C delivered from the dispersion device 36 is discharged from the nozzle 37b through the discharge pipe 37a of the discharge device 37, and is supplied to the back surface of the skin material 10 as shown in FIG. The foam material C is released from the atmosphere by being discharged from the nozzle 37c. Therefore, the volume per unit mass after being ejected from the nozzle 37c is larger than the volume per unit mass before being ejected, but since this is not foaming due to chemical change, the volume immediately after being released to the atmosphere. Since then, there is almost no change in volume. The value obtained by dividing the volume per unit mass after being discharged from the nozzle 37b by the volume per unit mass before being discharged from the nozzle 37b is the foaming ratio. It can be set arbitrarily depending on the mixing ratio.

  The amount of the foam material C supplied to the back surface of each skin material 10 is substantially the same as the volume of the foam material 11 since the volume of the foam material C hardly changes after discharge as described above.

  After the foam material C is supplied to the back surface of the skin material 10 as described above, when the upper mold 51 and the lower mold 52 are clamped as shown in FIG. While being molded by the surface 51a, it is heated and cured by the upper mold 51 and the lower mold 52 to obtain the foamed material 11 as shown in FIG. When the foam material 11 is molded, the foam material 11 is bonded to the skin material 10. Since the foam material 11 is obtained by mechanically foaming the foam material C in this way, it is not easily affected by the atmospheric environment as in the case of conventional chemical foaming. It becomes a state that is almost uniform when viewed as. In addition, since the gas is present as fine bubbles dispersed in the foam material C, the foam material 11 has a so-called closed cell structure in which the bubbles are separated by a wall and are not connected. It will have.

  Then, when the upper mold 51 and the lower mold 52 are opened, the skin panel 3 is obtained. The above is the skin panel manufacturing process.

  In addition, when supplying the foam material C to the back surface of the skin material 10, you may supply so that a spiral may be drawn from the back surface center vicinity of the skin material 10 toward an outer peripheral part, for example. By doing so, it becomes difficult for air to enter the foamed material C, and the foamed material 11 can be in a more uniform foamed state. The foam material C may be supplied so as to draw a spiral from the outer periphery of the back surface of the skin material 10 toward the center. The supply method of the foam material C is not limited to the above.

  Then, it moves to a skin panel joining process, and while adhering the skin panel 3 to the reinforcement layer 5 of the tube 2, the protruding wall parts 10b and 10b of the adjacent skin panels 3 and 3 are adhere | attached. The ball 1 can be obtained as described above.

  As described above, according to the first embodiment, since the foamed material 11 between the tube 2 and the skin material 10 is mechanically foamed, the foamed state of the foamed material 11 is almost uniform as a whole. State. Thereby, while being able to suppress distortion of ball 1, it can avoid that hardness changes with parts of ball 1. Therefore, when the ball is kicked, for example, the way to fly, the way to roll, and the feeling of biting into the leg become natural, and the rebound also becomes natural, so that the ball 1 having a good feeling of use can be obtained.

  In addition, since the foamed material 11 has a closed cell structure, it is possible to suppress the ball 1 from absorbing water and becoming heavy when it rains, for example, and the usability can be improved regardless of the weather. Moreover, it can also suppress that dust etc. enter the inside of the foam material 11. In addition, the life of the ball 1 can be extended by these things.

  In addition, the bubbles in the foamed material 11 are independent and small compared to those having an open-cell structure. Thereby, for example, even when the foamed material 11 receives an impact by kicking and the bubble wall is broken and adjacent bubbles communicate with each other, it is possible to make the space smaller than that of the open cell structure. As a result, the strength reduction of the foam material 11 is suppressed. Further, since the bubbles are small, it is possible to secure a wide bonding area to the tube 2 and the skin material 10, and a strong adhesive force can be obtained. As a result, the durability of the ball 1 is improved.

  Further, since small bubbles are independently formed in the foam material 11, it is possible to make the hardness of the foam material 11 uniform, and the specific gravity of each part also approaches uniformly, and the weight of the ball 1 Can be easily set to the specified weight. By making the hardness due to the portion of the foamed material 11 close to uniform as described above, for example, when the player kicks, the direction in which the ball 1 flies and the feeling of biting into the legs are not felt.

Moreover, since so as to mix the air in the foam material C, and the manufacturing process, high safety, no adverse effects on the human body and the environment. Also, the foamed material 11 can be obtained with high safety and no adverse effects on the human body and the environment.

  Further, since the skin material 10 is an injection-molded product, for example, the yield can be improved and the dimensional accuracy can be increased as compared with the case where the skin material is molded by punching from a film-like material.

  Further, since the skin material 10 is formed by injection molding, almost no waste material is generated, the yield can be improved, the dimensional accuracy of the skin material 10 can be improved, and the easy-to-handle ball 1 is obtained. Can do.

  Further, since the resin of the protruding wall portion 10b of the skin material 10 is made softer than the resin of the main body portion 10a, the protruding wall portion 10b becomes difficult to be stretched during use, and thus the ball 1 having a nearly uniform surface hardness is obtained. Can do. Thereby, the way to fly, the way to roll, and the feeling of biting into the legs become natural, the rebound characteristics become natural, and the feeling of use of the ball 1 can be improved.

  The main body 10a and the protruding wall 10b of the skin material 10 may be integrally formed. In this case, as in the first modification shown in FIG. 14, the thickness of the protruding wall portion 10b can be made thinner than the thickness of the main body portion 10a. The thickness of the protruding wall portion 10b is preferably set in the range of 1/2 to 1/3 of the main body portion 10a. Thereby, the rigidity of the protruding wall portion 10b is lowered, the protruding wall portion 10b becomes difficult to be stretched, and the hardness of the ball 1 comes to approach uniformly throughout. In the first modification, the main body 10a and the protruding wall 10b may be molded separately.

  Further, as in Modification 2 shown in FIG. 15, the protruding height of the protruding wall portion 10 b of the skin material 10 is lowered so that the distal end portion of the protruding wall portion 10 b is separated from the reinforcing layer 5 of the tube 2. Good. In the second modification, the foamed material 11 is interposed between the tip of the protruding wall portion 10b and the reinforcing layer 5, so that the hardness of the ball 1 approaches uniformly throughout. In the second modification, the thickness of the protruding wall portion 10b may be thinner than the thickness of the main body portion 10a, or the main body portion 10a and the protruding wall portion 10b may be formed separately.

  Further, the thickness of the main body portion 10a of the skin material 10 may be changed depending on the portion, and the thickness of the protruding wall portion 10b may be changed depending on the portion.

  Further, as in the third modification shown in FIG. 16, the foam material 11 may be separately formed by the inner portion 11a and the outer portion 11b on the protruding wall portion 10b side. In this case, it is preferable to make the outer side part 11b softer than the inner side part 11a. Specifically, the expansion ratio of the outer part 11b of the foam material 11 can be made larger than the expansion ratio of the inner part 11a, or the urethane material of the outer part 11b can be made softer than the urethane material of the inner part 11a. Become. In the case of forming the foamed material 11 of the modified example 3, although not shown, a mold for molding the outer part 11b and a mold for molding the inner part 11a are prepared, and the outer part 11b and the inner part 11a are prepared. And are molded separately. Moreover, the outer side part 11b and the inner side part 11a may be adhere | attached, and may be heat-welded. Moreover, you may comprise the outer side part 11b and the inner side part 11a with materials other than a urethane material. Moreover, the outer side part 11b and the inner side part 11a may be comprised with a different material, and hardness can also be set arbitrarily.

  Further, as in Modification 4 shown in FIG. 17, the foam material 11 may have a large number of beads 55. The beads 55 can be dispersed in the foamed material 11 by mixing with the foamed material C before molding. By making the specific gravity of the beads 55 smaller than the specific gravity of the foam material 11, the weight of the ball 1 can be reduced. Conversely, by making the specific gravity of the beads 55 larger than the specific gravity of the foam material 11, The weight of the ball 1 can be increased. The beads 55 can be made of various resin materials, for example. The number, size, and material of the beads 55 can be arbitrarily set. For example, when the beads 55 are formed of a material having higher resilience than the foam material 11, the resilience of the ball 1 can be improved, and when the beads 55 are formed of a material having low resilience, The resilience can be reduced. Moreover, it is preferable to set the diameter of the bead 55 within the range of 0.01 mm-3.00 mm, for example. Further, the shape of the beads 55 may be other than a sphere.

  Further, as in Modification 5 shown in FIG. 18, when the protruding wall portion 10 b of the skin material 10 is shortened, a separate foam material 12 is provided so as to correspond to the peripheral edge portion of the adjacent skin material 10. It may be. It is preferable to make the foam material 12 at the peripheral edge softer than the foam material 11. By doing so, the hardness of the portion corresponding to the protruding wall portion 11b of the ball 1 can be brought close to the hardness of other portions.

  Moreover, you may provide the uneven | corrugated | grooved part 11c in the back surface of the foam material 11 like the modification 6 shown in FIG. Thereby, the contact area with the reinforcement layer 5 of the tube 2 increases, and peeling and the float of the foaming material 11 can be suppressed. The uneven portion 11c may be provided on a part of the back surface of the foam material 11, or may be provided on the entire surface.

  Moreover, you may form in a corrugated sheet shape by providing an uneven | corrugated | grooved part in the main-body part 10a of the skin material 10 like the modification 7 shown in FIG. This corrugated plate shape is formed by the mold 20 during the injection molding of the skin material 10. Thus, a concave part and a convex part can be easily formed by injection molding the skin material 10. Further, the main body 10a may be provided with ridges (convex portions) or concave ridges (concave portions) extending in the circumferential direction of the ball 1 without providing a corrugated plate shape, or with dimple-shaped portions (concave portions). Good. Depending on the shape of the concave and convex portions of the skin material 10, it is possible to make the ball 1 that is easily curved or the ball 1 that is easy to fly. In addition, by forming the concave portion or the convex portion on the front side of the main body portion 10a as described above, a shape corresponding to them is formed on the back side of the main body portion 10a, but the main body portion 10a is injection-molded. Therefore, the shape on the back side and the shape on the front side can be different.

  Moreover, you may form several recessed part 11c in the back surface of the foam material 11 like the modification 8 shown in FIG. This makes it possible to change the feeling of use of the ball 1 such as the feeling of biting into the leg when the ball 1 is kicked, the rebound characteristics, and the impact applied to the head and legs by the foam material 11. Further, as in Modification 9 shown in FIG. 22, when the recess 11 d is provided in the foam material 11, the bottom of the recess 11 d (on the surface side of the skin panel 3) may be enlarged in a spherical shape. . In this modified example 8, while forming the concave part 11d in the foam material 11 and softening it, a sufficient adhesion area with the reinforcing layer 5 can be secured, and peeling and floating can be suppressed. Moreover, it is also possible to adjust the rebound property of the ball | bowl 1 with the recessed part 11d.

  23, for example, a film 56 on which a school name is printed may be provided on the main body 10a of the skin material 10. In this case, the material forming the skin material 10 is a light-transmitting material. The film 56 can be covered with a resin material by holding (insert-molding) the film 56 on the rear surface side molding surface 22a of the molding die 20 when the skin material 10 is molded. Thereby, the surface of the film 56 can be protected and it can suppress that a character lose | disappears by use of the ball | bowl 1. FIG. Not only the school name but also the team name, club name, sports association certification mark, tournament name, and various characters and patterns such as the manufacturer name of the ball 1 can be printed on the film 56 to be inserted. is there. In addition, since the surface of the film 56 is covered with a translucent resin material, the characters and patterns on the film 56 can be seen behind the surface of the ball 1, so that the design of the ball 1 is high-class. A feeling can be given and the appearance of the ball 1 can be improved. Further, a plurality of films 56 may be insert-molded on one skin material 10. The size and shape of the film 56 can be arbitrarily set. Further, the film 56 may be insert-molded on the front side of the skin material 10, or may be insert-molded on an intermediate portion in the thickness direction of the skin material 56. Moreover, you may make it affix on the surface and the back surface of the skin material 10, without insert-molding the film 56. FIG.

  The structures exemplified as the modified examples 1 to 10 can be arbitrarily combined.

  Moreover, in the said embodiment, although the foam material 11 is shape | molded integrally with the skin material 10, it is not restricted to this, For example, the foam material 11 is previously made into the shape corresponding to the shape of the back surface of the skin material 10. The foam material 11 may be bonded to the skin material 10 in advance. That is, the foam material is made into a sheet material, and the foam material 11 having a shape that matches the shape of the back surface of the skin material 10 is cut out from the sheet material by using a mold, thereby corresponding to the shape of the back surface of the skin material 10. The foam material 11 to be obtained can be obtained.

  In this case, it is preferable that the foam material 11 has a curved shape along the shape of the outer peripheral surface of the tube 2. Alternatively, the skin material 10 may be bonded to the foam material 11 after the foam material 11 is bonded to the reinforcing layer 5 of the tube 2.

  Moreover, in the said embodiment, although the several skin panel 3 is comprised with the foam material 11 of the same hardness, only one sheet is made harder than the other skin panels 3 among these skin panels 3, for example. Or it may be softened. Thereby, for example, in the case of a soccer ball, the ball can be easily controlled, for example, when a corner kick or a free kick can be easily applied. The number of the skin panels 3 whose hardness is different from that of the other skin panels 3 may be two or three. Further, it is preferable to change the color and pattern of the skin panel 3 from those of other skin panels 3.

  Moreover, in the said embodiment, although the main-body part 10a and the protrusion wall part 10b of the skin material 10 are shape | molded with a separate apparatus, the main-body part 10a, a shaping | molding die, and the shaping | molding die of the protrusion wall part 10b are comprised. You may make it shape | mold using the integrated apparatus.

(Embodiment 2)
FIG. 25 is a cross-sectional view of the ball 1 according to the second embodiment of the present invention. The ball 1 according to the second embodiment is different from that of the first embodiment in that the foam material 57 provided on the reinforcing layer 5 of the tube 2 is not divided as in the first embodiment. Hereinafter, with respect to the ball 1 according to the second embodiment, the same portions as those of the first embodiment are denoted by the same reference numerals, description thereof is omitted, and different portions are described in detail.

  The foam material 57 is formed by mechanical foaming of a foam material, and is continuously provided with a uniform thickness over the entire reinforcing layer 5 of the tube 2 and is integrally formed. Each skin material 10 does not have the protruding wall portion as in the first embodiment, and the entire back surface is attached to the surface of the foam material 57.

  The ball 1 of the second embodiment is manufactured as follows. That is, first, as shown in FIG. 26, the foam material C is applied to the entire surface of the reinforcement layer 5 of the tube 2 using the foam material supply device 30 of Embodiment 1, and the reinforcement layer 5 is made of the foam material C. Leave coated. Thereafter, although not shown, a foam material 57 is obtained as shown in FIG. 27 by putting the foam material in a heating furnace heated to about 80 ° C. to cure the foam material. This is the foam material forming step.

  Thereafter, the skin material 10 is bonded to the surface of the foam material 57. At this time, the peripheral portions of the adjacent skin materials 10 and 10 are also bonded together. This is the skin material joining step. The skin material 10 can be obtained by an apparatus similar to the main body wall forming apparatus of the first embodiment.

  Even in the second embodiment, the foam material 57 between the tube 2 and the skin material 10 is mechanically foamed, so that when the ball is kicked, for example, the way of flying, rolling, and biting into the legs The feeling becomes natural and the rebound becomes natural, and the ball 1 having a good feeling of use can be obtained.

  In the second embodiment, the foam material 57 may have beads as in the fourth modification of the first embodiment. In the second embodiment, the skin material 10 may be provided with a corrugated plate shape, a ridge, a recess, or a dimple shape. In the second embodiment, a film may be insert-molded on the skin material 10.

  In the first and second embodiments, the case where the skin material 10 has a single-layer structure has been described. However, the skin material 10 may have a multilayer structure.

  In the first and second embodiments, the skin material 10 may be formed of a light-transmitting resin material. Thereby, the color of the foam materials 11 and 57 can be seen through from the surface of the ball 1, and the ball 1 can be designed with a depth. In this case, the foam materials 11 and 57 can be used as a part of the design by arbitrarily setting the colors of the foam materials 11 and 57. Further, by making the skin material 10 colored and transparent, the colors of the foam materials 11 and 57 and the color of the skin material 10 appear to be mixed, and the degree of freedom in design is improved. Further, when printing is performed on the skin material 10, it is possible to reduce the printing color by using the colors of the foam materials 11 and 57. Moreover, the see-through design ball 1 can be obtained by making the skin material 10 colorless and transparent. Further, the color of the skin material 10 may be a marble pattern in which multiple colors are mixed imperfectly, or the colors of the foam materials 11 and 57 may be a similar marble pattern. Further, the resin material forming the skin material 11 and the material of the foam material 11 may be mixed with a phosphorescent material, a reflective material that reflects light, a fluorescent material, and the like.

  In the first and second embodiments, the case where the skin material 10 of the ball 1 is a pentagon or a hexagon has been described. However, the shape is not limited to this, and the shape of the skin material 10 can be arbitrarily set. For example, the skin material 10 may be hemispherical and the two may be combined, or the spheres may be ¼ or １ ／ in shape, and a plurality of these may be combined.

  Moreover, although the said Embodiment 1 and 2 demonstrated the case where the skin material 10 was a curved shape, this skin material 10 may be flat plate shape. Similarly, the foam material 11 may have a flat plate shape.

  Further, by changing the expansion ratio of the foamed materials 11 and 57, it is possible to easily change the weight of the ball 1 and change the resilience (rebound property).

  Moreover, the thickness of the foam materials 11 and 57 and the thickness of the skin material 10 can be set arbitrarily.

  Moreover, you may make it form the printing layer in the skin material 10 by pad printing, screen printing, and inkjet printing. In this case, the printing layer may be formed on a part of the skin material 10 or on the entire surface.

  Further, the material and color of the skin material 10 may be changed from each other. Further, the skin material 10 may be obtained by punching from a resin sheet material, for example.

  Further, the present invention can be applied to toy balls as well as ball balls such as soccer balls, futsal balls, handballs, basketballs and volleyballs. Moreover, in the said embodiment, although the core part of this invention is comprised with the tube 2, the core part may be the thing of the solid structure which consists of sponge, gel, etc. besides the thing of a hollow structure. . Moreover, the material of the core part is not limited to the above, and various kinds of materials can be used. In addition to the spherical shape, the core portion may have a shape such as a rugby ball. Further, the core part may have a multilayer structure.

  In addition, in the futsal ball, it is necessary to reduce the rebound property compared to a soccer ball or the like. In this case, the foam material 11 is made to have a low repulsion, so that the desired material can be obtained without stuffing inside. Rebound can be obtained. Thereby, since the inside is light and the outer peripheral part is heavy, a controllability can be improved.

  As described above, the present invention can be applied to, for example, a soccer ball.

1 Ball 2 Tube (Core)
3 Skin panel 10 Skin material 11, 57 Foam material 11d Recess 55 Bead

Claims (8)

A core portion, and a foam disposed outside of the core portion, while the Ru and a skin material which is provided on the outside of the foam material, the skin material is divided into a plurality, the foam thermoset elastomeric foam material is integrally molded on the rear surface of each of the upper Symbol skin material together to have a closed cell structure formed by mechanically foaming with air, the ball which the foam is bonded to the core The skin material includes a body portion made of a curved plate-like resin as a portion constituting the outermost layer of the ball, and a projecting wall portion made of a resin projecting from the peripheral portion of the body portion toward the core portion. A ball characterized in that the resin of the protruding wall portion is made of a softer resin than the resin of the main body portion .   While comprising a core part, a foam material provided on the outside of the core part, and a skin material provided on the outside of the foam material, the skin material is divided into a plurality of sheets, and the foam material is heated. The cured elastomer foam material has a closed cell structure formed by mechanical foaming using air and is integrally formed on each back surface of the skin material, and the foam is a ball bonded to the core, The skin is provided with a main body portion made of a plate-like resin that is curved as a portion constituting the outermost layer of the ball, and a projecting wall portion made of a resin projecting from the peripheral portion of the main body portion toward the core portion, A ball characterized in that the thickness of the portion is configured to be thinner than the thickness of the main body portion.   While comprising a core part, a foam material provided on the outside of the core part, and a skin material provided on the outside of the foam material, the skin material is divided into a plurality of sheets, and the foam material is heated. The cured elastomer foam material has a closed cell structure formed by mechanical foaming using air and is integrally formed on each back surface of the skin material, and the foam is a ball bonded to the core, A foam material comprising a body portion made of a curved plate-like resin and a projecting wall portion made of a resin projecting from the peripheral portion of the body portion toward the core portion as a portion constituting the outermost layer of the ball. Comprises an inner part located on the side of the central part of the body part of the skin material and an outer part located on both sides of the peripheral part of the body part and the protruding wall part of the skin material, and the inner part and the outer part of the foam material And a ball formed separately.   While comprising a core part, a foam material provided on the outside of the core part, and a skin material provided on the outside of the foam material, the skin material is divided into a plurality of sheets, and the foam material is heated. The cured elastomer foam material has a closed cell structure formed by mechanical foaming using air and is integrally formed on each back surface of the skin material, and the foam is a ball bonded to the core, A foam material comprising a body portion made of a curved plate-like resin and a projecting wall portion made of a resin projecting from the peripheral portion of the body portion toward the core portion as a portion constituting the outermost layer of the ball. The ball is characterized by a large number of beads.   While comprising a core part, a foam material provided on the outside of the core part, and a skin material provided on the outside of the foam material, the skin material is divided into a plurality of sheets, and the foam material is heated. The cured elastomer foam material has a closed cell structure formed by mechanical foaming using air and is integrally formed on each back surface of the skin material, and the foam is a ball bonded to the core, A foam material comprising a body portion made of a curved plate-like resin and a projecting wall portion made of a resin projecting from the peripheral portion of the body portion toward the core portion as a portion constituting the outermost layer of the ball. A ball characterized in that a concavo-convex portion or a concave portion is provided on the back surface on the core side.   While comprising a core part, a foam material provided on the outside of the core part, and a skin material provided on the outside of the foam material, the skin material is divided into a plurality of sheets, and the foam material is heated. The cured elastomer foam material has a closed cell structure formed by mechanical foaming using air and is integrally formed on each back surface of the skin material, and the foam is a ball bonded to the core, The skin material comprises a body portion made of a curved plate-like resin as a portion constituting the outermost layer of the ball, and a projecting wall portion made of a resin projecting from the peripheral portion of the body portion toward the core portion, The resin of the main body part has translucency, and a film on which a character or a pattern is printed is provided on the back surface located on the core part side of the main body part of the skin material.   While comprising a core part, a foam material provided on the outside of the core part, and a skin material provided on the outside of the foam material, the skin material is divided into a plurality of sheets, and the foam material is heated. The cured elastomer foam material has a closed cell structure formed by mechanical foaming using air and is integrally formed on each back surface of the skin material, and the foam is a ball bonded to the core, The skin is provided with a main body portion made of a plate-like resin that is curved as a portion constituting the outermost layer of the ball, and a projecting wall portion made of a resin projecting from the peripheral portion of the main body portion toward the core portion, A ball characterized in that the part is separated from the core part.   While comprising a core part, a foam material provided on the outside of the core part, and a skin material provided on the outside of the foam material, the skin material is divided into a plurality of sheets, and the foam material is heated. The cured elastomer foam material has a closed cell structure formed by mechanical foaming using air and is integrally formed on each back surface of the skin material, and the foam is a ball bonded to the core, The skin is provided with a main body portion made of a plate-like resin that is curved as a portion constituting the outermost layer of the ball, and a projecting wall portion made of a resin projecting from the peripheral portion of the main body portion toward the core portion, A ball having a portion separated from the core portion and a foam material separate from the foam material provided at a portion of the protruding wall portion away from the core portion.

Images