JP2006345935A - Ball made of resin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve merchantability by forming patterns with a perspective sense and the sense of depth on a ball without changing the external shape of the ball. <P>SOLUTION: The ball 1 is constituted of a core spherical body 3 composed of a first ball constituting member 6 and a second ball constituting member 7 in a halved shape and a cover material 4 covering the core spherical body 3. The first ball constituting member 6, the second ball constituting member 7 and the cover material 4 are formed of a colorless transparent resin material. On the first recessed face 10 of the first ball constituting member 6, a first pattern formation part 8 for which a plurality of planes are combined is provided. On the second recessed face 16 of the second ball constituting member 7, a similar second pattern formation part 15 is provided. The first ball constituting member 6 and the second ball constituting member 7 are adhered with a resin material 23 for adhesion. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a resin ball used for, for example, park golf or ground golf.

In recent years, park golf and ground golf (hereinafter referred to as park golf, etc.) that can be performed on grass such as parks and riverbeds are becoming popular because they are easier than general golf performed at golf courses. In this park golf or the like, for example, as disclosed in Patent Document 1, resin balls formed of a high-strength hard resin material are used. The size and weight of the ball used in this park golf etc. are stipulated in the regulations, and when a solid ball of a regular size is molded using the high strength hard resin material as described above, The weight of the ball may become heavier than the weight determined by the rules. In this case, as in the ball of Patent Document 1, a hollow portion is provided in the center portion to reduce the weight.
JP 2005-27711 A

  However, as described above, the size of the ball is defined by a rule, and the surface of the ball can hardly be made uneven so as to deteriorate the rolling property. It becomes the same and poor merchandise. Therefore, it is conceivable to improve the merchantability by adding value by forming a pattern on the ball. However, as described above, the surface of the ball must be considered for rolling, so that no irregularities are generated. Only patterns composed of letters and figures can be formed, and it is difficult to improve the merchantability.

  The present invention has been made in view of such points, and the object of the present invention is to change the outer shape of the ball by utilizing a hollow portion provided when reducing the weight of the resin ball, The purpose is to improve the merchantability by forming a pattern with a sense of depth and depth on the ball.

  In order to achieve the above object, in the present invention, a resin ball is formed by combining a plurality of ball constituent members having concave surfaces for forming a hollow portion, and a pattern forming portion is provided on the concave surface. Can be seen from the outside of the ball.

  Specifically, the invention of claim 1 is directed to a resin ball provided with a cavity.

  And a plurality of ball constituent members each having a concave surface for forming the hollow portion, wherein each of the ball constituent members is formed of a translucent resin material, and the concave surface includes a concave surface of the ball constituent member. The pattern formation part which forms the pattern visible from the opposite side is provided.

  According to this configuration, since the pattern forming portion is formed on the concave surface of the ball constituent member, the pattern forming portion is located away from the surface of the ball toward the center. And since the ball constituent member is formed of a resin material having translucency, for example, when the user looks at the ball, the pattern forming portion is directed toward the inside of the ball through the resin material forming the ball constituent member. You will see. As a result, it is possible to form a pattern having a sense of depth or depth on the ball without creating an uneven shape on the surface of the ball.

  According to a second aspect of the present invention, in the first aspect of the present invention, the ball constituent member is covered with a skin material formed of a resin material having translucency.

  According to this configuration, the plurality of ball components are covered with the skin material and firmly integrated. And since a skin material is formed with the resin material which has translucency, a pattern formation part will be seen through a skin material, and the feeling of the depth of a pattern and a feeling of depth are emphasized more.

  According to a third aspect of the present invention, in the first aspect of the present invention, the concave surfaces of the ball constituent members are bonded to each other with a resin material having translucency in a state of being combined with each other.

  According to this configuration, the ball constituent members are bonded and integrated by the resin material having translucency. Thus, for example, when the user looks at the ball, the pattern forming portion is not hidden by the resin material for bonding the ball constituent members, and the pattern forming portion is viewed in the same way from any direction. Is possible.

  According to a fourth aspect of the present invention, in any one of the first to third aspects of the present invention, the ball constituent member is formed of an ionomer resin.

  According to this configuration, it is possible to ensure translucency while satisfying the toughness required for the ball.

  According to the first aspect of the present invention, since the ball constituent member having a concave surface is formed using a resin material having translucency, and the pattern forming portion is provided on the concave surface, the pattern having a sense of depth and depth on the ball. Can be formed and the merchantability can be improved.

  According to invention of Claim 2, a ball | bowl structural member can be covered with a skin material, can be integrated firmly, and it can suppress that it breaks at the time of use. In this case, since the pattern forming portion can be seen through the skin material, it is possible to further emphasize the sense of depth and depth of the pattern.

  According to invention of Claim 3, a some ball | bowl structural member can be integrated using the resin material which has translucency. In this case, since the pattern forming portion can be seen in the same way from any direction, the appearance of the ball can be improved.

  According to the invention of claim 4, since the ball constituent member is formed of an ionomer resin, while ensuring the toughness required for the ball, the translucency is ensured and the visibility of the pattern forming portion is improved. Can do.

  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.

  FIG. 1 shows a resin ball 1 according to an embodiment of the present invention. The ball 1 is used in competitions such as park golf, and has a size and weight according to the rules defined in the park golf. Specifically, the ball 1 has a diameter of about 60 mm and a weight of about 100 g.

  As shown in FIG. 2, the ball 1 includes a center sphere 3 having a hollow portion 2 inside, and a skin material 4 that covers the entire outer surface of the center sphere 3. The inner core sphere 3 is configured by combining a hemispherical first ball constituent member 6 and a second ball constituent member 7 divided by a plane passing through the center of the inner core sphere 3. The first ball constituent member 6 and the second ball constituent member 7 have the same shape, and are made of a resin material having both a toughness that does not break due to the striking force of the club and an appropriate elasticity and flexibility as the ball 1. It is formed by injection molding. Examples of the resin material for forming the first ball component member 6 and the second ball component member 7 include ionomer resin, and specifically, High Milan (registered trademark) manufactured by Mitsui DuPont Polychemical Co., Ltd. ) Etc. There are a number of brands in this high Milan, but a plurality of brands may be mixed and used, or a single brand may be used. In this embodiment, as a resin material for forming the ball constituent members 6 and 7, a resin material obtained by mixing high-Milan brands 1652 and 1706 in a volume ratio of 1: 1 is used, and this resin material is colorless and transparent. . The high hardness brand 1652 has a Shore hardness of 50 and the brand 1706 has a Shore hardness of 60. Accordingly, the Shore hardness of the ball constituent members 6 and 7 is about 55.

  As shown in FIGS. 3 to 5, a hemispherical first concave surface for forming the cavity 2 is formed at the center of the surface of the first ball component 6 facing the second ball component 7. 10 is provided. Moreover, the 1st level | step-difference part 11 extended continuously in cyclic | annular form is provided in the peripheral part of the surface facing the 2nd ball | bowl structural member 7 of the 1st ball | bowl structural member 6. FIG. The first step portion 11 includes a first outer surface 12 extending from the outer surface of the first ball component member 6 toward the inner side of the first ball component member 6, and a second portion from the inner end portion of the first outer surface 12. The first central surface 13 extends toward the ball constituent member 7. A first inner surface 14 is provided between the first central surface 13 and the first concave surface 10.

  A substantially entire first concave surface 10 is provided with a first pattern forming portion 8 that forms a visible pattern when viewed from the side opposite to the first concave surface 10 of the first ball component 6. The first pattern forming portion 8 is three-dimensionally configured by combining a large number of hexagonal flat surfaces and pentagonal flat surfaces, and the boundary between the hexagonal flat surface and the pentagonal flat surface. The line is visible.

  Further, as shown in FIG. 2, the second ball component member 7 also has a second concave surface 16, a second outer surface 18, a second central surface 19, a second inner surface 20, and the like, similarly to the first ball component member 6. A second pattern forming portion 15 is provided, and the second stepped portion 17 is configured by the second outer surface 18 and the second central surface 19. When the first ball constituent member 6 and the second ball constituent member 7 are combined, the first inner side surface 14 and the second inner side surface 20 overlap each other.

  In the state where the first inner side surface 14 and the second inner side surface 20 are overlapped by combining the first ball constituent member 6 and the second ball constituent member 7, the first step portion 11 and the second step portion 17 serve as the center. An annular groove 22 (shown in FIG. 9) that goes around the outer surface of the sphere 3 is formed. The annular groove 22 is filled with an adhesive resin material 23 for bonding the first ball constituent member 6 and the second ball constituent member 7. The ball constituent members 6 and 7 are welded together by the adhesive resin material 23. The adhesive resin material 23 is the same as the resin material forming the ball constituent members 6 and 7.

  The skin material 4 is formed by injection molding a colorless and transparent ionomer resin, and is integrated with the core sphere 3. As the resin material for forming the skin material 4, high Milan can be cited as in the resin material for forming the ball constituent members 6 and 7. The resin material forming the ball constituent members 6 and 7 is set to be softer than the resin material forming the skin material 4. Specifically, in this embodiment, as the resin material for forming the skin material 4, a resin material in which high-Milan brands 1555 and 1706 are mixed at a volume ratio of 2: 1 is used. The Shore hardness of High Milan brand 1555 is 57 and the Shore hardness of brand 1706 is 60 as described above. Therefore, the shore hardness of the skin material 4 is about 58.

  The thickness of the skin material 4 is set to be thinner than the thickness of each of the ball constituent members 6 and 7. Further, as shown in FIGS. 1 and 17, the skin material 4 includes an annular first skin portion 25 that extends across the adhesive resin material 23 on the outer surface of the core sphere 3, and the first core sphere 3. The second skin portion 26 covers a portion other than the portion covered with the first skin portion 25. The crossing angle between the first skin portion 25 and the adhesive resin material 23 is approximately 90 °.

  Next, the structure of the manufacturing apparatus 30 used when manufacturing the ball 1 configured as described above will be described. The manufacturing apparatus 30 includes a primary molding device 31 for molding the core sphere 3 of the ball 1 and a secondary molding for integrally molding the skin material 4 on the core sphere 3 molded by the primary molding device 31. Device 32.

  As shown in FIG. 6, the primary molding apparatus 31 includes a molding die 33 for molding a core sphere and a primary injection machine 34 for injecting a resin material. The molding die 33 includes a movable die 35, a fixed die 36, and a slide die 37 that slides between the movable die 35 and the fixed die 36 along the dividing surface of the movable die 35 and the fixed die 36. After the first ball constituent member 6 and the second ball constituent member 7 are molded, the first ball constituent member 6 and the second ball constituent member 7 are combined and welded together by the adhesive resin material 23 to be integrated. It is configured as follows.

  The primary molding device 31 includes a moving device (not shown) for moving the movable die 35, so that the movable die 35 is moved in the horizontal direction by this moving device so as to contact and separate from the slide die 37. It has become. The state in which the movable mold 35 is in contact with the slide mold 37 is a mold closed state. In this mold closed state, the movable mold 35 and the fixed mold 36 are clamped by a mold clamping device (not shown). . Further, the primary molding device 31 includes a moving device 38 as a slide type moving means for moving the slide die 37 in the vertical direction. The slide type moving device 38 is composed of a fluid pressure cylinder that expands and contracts in the vertical direction. Further, the core molding die 33 is provided with an eject pin (not shown).

  The primary injection machine 34 has a known structure including a cylinder 40 and a screw (not shown) for kneading a resin material. An injection nozzle 40 a is provided at the tip of the cylinder 40. On the other hand, the fixed mold 36 is formed with a sprue 41 to which the injection nozzle 40a of the primary injection machine 34 is connected.

  A first cavity 43 for molding the first ball component 6 is formed below the movable die 35 and the slide die 37, and a second ball component 7 is molded on the upper side. A second cavity 44 is formed. Further, a runner 47, a first gate 48, and a second gate 49 are formed in the vicinity of the center of the movable die 35 in the vertical direction along with the slide die 27. The runner 47 communicates with the sprue 41 via a first sub sprue 57 or a second sub sprue 58 described later, the first gate 48 communicates with the first cavity 43, and the second gate 49 communicates with the second cavity 44. It communicates. On the surface of the movable die 35 facing the slide die 37, the runner recess 50, the first gate recess 51 and the second gate recess constituting the runner 47, the first gate 48 and the second gate 49, respectively. A portion 52 is formed. The cross-sectional shapes of the first gate 48 and the second gate 49 can be, for example, circular or square.

  A first inner molding surface 45 for molding the first concave surface 10 side of the first ball constituting member 6 is formed on the lower side of the surface of the movable die 35 facing the slide die 37, and the second ball is formed on the upper side. A second outer molding surface 46 for molding the side opposite to the second concave surface 16 of the component member 7 is formed. The first inner molding surface 45 includes a convex surface portion 45a corresponding to the shape of the first concave surface 10 of the first ball constituting member 6 and an annular ridge portion 45b corresponding to the shape of the first step portion 11. ing. A hexagonal flat surface and a pentagonal flat surface for forming the first pattern forming portion 8 are formed on the convex surface portion 45a. In addition, a notch 45c is formed in a portion of the protrusion 45b facing the first gate 48 so that the resin material flowing from the first gate 48 can smoothly reach the first cavity 43. Yes.

  On the lower side of the surface of the slide mold 37 facing the movable mold 35, a first outer molding surface 54 for molding the side opposite to the first concave surface 10 of the first ball constituting member 6 is formed. A second inner molding surface 55 for molding the second concave surface 16 side of the two-ball component member 7 is formed. The second inner molding surface 55 includes a convex surface portion 55a corresponding to the shape of the second concave surface 16 of the second ball constituting member 7 and an annular ridge portion 55b corresponding to the shape of the second stepped portion 17. Yes. A hexagonal flat surface and a pentagonal flat surface for forming the second pattern forming portion 15 are formed on the convex surface portion 55a. A cutout portion 55c is formed in a portion of the protruding portion 55b facing the second gate 49. The first outer molding surface 54 and the second outer molding surface 46 are formed so as to hold the first ball component member 6 and the second ball component member 7, respectively.

  As shown in FIG. 6, when the slide mold 37 is moved to the lowered end position by the moving device 38, the first outer molding surface 54 of the slide mold 37 faces the first inner molding surface 45 of the movable mold 35, and The second inner molding surface 55 of the slide mold 37 faces the second outer molding surface 46 of the movable mold 35. In this state, when the movable mold 35 and the fixed mold 36 are closed, the first cavity 43 is formed by the first outer molding surface 54 of the slide mold 37 and the first inner molding surface 45 of the movable mold 35, A second cavity 44 is formed by the second inner molding surface 55 of the slide mold 37 and the second outer molding surface 46 of the movable mold 35.

  On the other hand, as shown in FIG. 9, when the slide mold 37 is moved to the rising end position by the moving device 38, the first outer molding surface 54 of the slide mold 37 faces the second outer molding surface 46 of the movable mold 35. It is like that. At this time, when the mold is closed with the first ball component 6 held on the first outer molding surface 54 and the second ball component 7 held on the second outer molding surface 46, the first ball component 6 The first concave surface 10 side and the second concave surface 16 side of the second ball constituting member 7 are combined. The shape of the first outer molding surface 54 and the second outer molding surface 46 is such that the bonding cavity 56 is formed on the outer peripheral side of the mating portion between the first ball component member 6 and the second ball component member 7 in the above-described mold closed state. The shape is formed.

  As shown in FIG. 6, the slide mold 37 communicates with the sprue 41 between the first outer molding surface 54 and the second inner molding surface 55 when the slide mold 37 is in the lowered end position. One sub sprue 57 is formed. Further, as shown in FIG. 9, a second sub sprue 58 that communicates with the sprue 41 when the slide die 37 is at the rising end position is provided below the first outer molding surface 54 of the slide die 37. Is formed. The downstream ends of the first sub sprue 57 and the second sub sprue 58 are in communication with the runner 47.

  The secondary molding device 32 includes a first skin part molding die 60 (shown in FIG. 12) for molding the first skin part 25 and a second skin part for molding the second skin part 26. A molding die 61 (shown in FIG. 15) and a secondary injection machine (not shown) for injecting a resin material are provided. The first skin part molding die 60 includes an upper die 62 and a lower die 63. Further, the secondary molding device 32 includes a moving device (not shown) for moving the upper die 62, and the upper die 62 moves in the vertical direction by this moving device so as to contact the lower die 63. To come apart. The state in which the upper mold 62 is in contact with the lower mold 63 is a mold closed state, and the upper mold 62 and the lower mold 63 are clamped by a mold clamping device (not shown) in this mold closed state. . The secondary injection machine is configured similarly to the primary injection machine 34 described above. The upper die 62 is formed with a sprue 64 to which the injection nozzle of the secondary injection machine is connected.

  An upper concave surface 65 is formed on the lower surface of the upper mold 62, and a lower concave surface 66 is formed on the upper surface of the lower mold 63. The upper concave surface 65 and the lower concave surface 66 are formed in a shape corresponding to the outer surface shape of the core sphere 3. As shown in FIG. 13, the center sphere 3 is held by the upper mold 62 and the lower mold 63 in contact with the upper concave surface 65 and the lower concave surface 66. Further, on the upper concave surface 65 and the lower concave surface 66, concave strip portions 65a and 66a having shapes corresponding to the first skin portion 25 are formed, respectively. When the upper die 62 and the lower die 63 are closed with the central sphere 3 placed on the lower concave surface 66, the concave portions 65a and 66a are continuous on the outer surface of the central sphere 3, and the first surface is connected to the outer surface. A skin part forming cavity 67 is formed.

  As shown in FIG. 15, the second skin part molding die 61 includes an upper mold 70, a lower mold 71, and the upper mold 70 is a lower mold like the first skin part molding die 60. It comes in contact with and away from 71. An upper molding surface 72 is formed on the lower surface of the upper mold 70, and a lower molding surface 73 is formed on the upper surface of the lower mold 71. The upper molding surface 72 and the lower molding surface 73 are formed in a concave shape corresponding to the outer surface shape of the skin material 4. Accordingly, as will be described in detail later, when the core sphere 3 integrally molded with the first skin portion 45 is placed on the lower molding surface 73 and the upper die 70 and the lower die 71 are closed, the first skin portion 45 Is in contact with the molding surfaces 72 and 73 so that the center sphere 3 is held by the upper die 70 and the lower die 71. At this time, as shown in FIG. 17, the second skin portion forming cavity 74 is formed on the outer peripheral side of the core sphere 3. The first skin part forming cavity 67 and the second skin part forming cavity 74 are skin material cavities.

  The second skin part forming die 61 is formed with a sprue 75 to which the injection nozzle of the secondary injection machine is connected. Further, as shown in FIG. 15, a runner 76 that communicates with the downstream end of the sprue 75 and four gates 77 that communicate with the runner 76 are formed between the upper mold 70 and the lower mold 71. It has become so. The runner 76 extends so as to surround a joint portion between the upper molding surface 72 and the lower molding surface 73. The gates 77 are arranged at intervals in the direction in which the runner 76 extends. As shown in FIG. 16, a runner recess 78 and a gate recess 79 are respectively formed on the lower surface of the upper mold 70 and the upper surface of the lower mold 71, and the runner 76 and the gate 77 are in the mold closed state. Is to be formed. The gate 77 has a sectional area of 1 square millimeter or more, and the sectional shape can be, for example, a circle or a square.

  Next, a procedure for manufacturing the ball 1 using the manufacturing apparatus 30 configured as described above will be described. First, as shown in FIG. 6, with the slide mold 37 of the primary molding apparatus 31 in the lowered end position, the movable mold 35 is brought close to the slide mold 37 to be in the mold closed state. As a result, the first cavity 43 and the second cavity 44 are formed on the lower side and the upper side of the mold 33, respectively, and the runner 47, the first gate 48, and the second gate 49 are provided between the cavities 43, 44. It is formed. On the other hand, in the primary injection machine 34, high-Milan brands 1652 and 1706 are introduced into the cylinder 40 at a volume ratio of 1: 1 and heated and kneaded to be in a molten state.

  After the mold is closed, as shown in FIG. 7, when the resin material is injected from the injection nozzle 40a of the primary injection machine 34, the resin material passes through the sprue 41 of the fixed mold 36 and the first sub sprue 57 of the slide mold 37, and the runner. 47. The resin material flowing into the runner 47 flows into the first cavity 43 from the first gate 48 and flows into the second cavity 44 from the second gate 49. When the resin material that has flowed into the first cavity 43 and the second cavity 44 is solidified, the movable die 35 is separated from the slide die 37 to be in an open state as shown in FIG. This step is a step of forming the first ball constituent member 6 and the second ball constituent member 7 with the forming die 33 for forming the core sphere.

  When the movable mold 35 is in the mold open state, the first ball constituting member 6 formed by the first cavity 43 is held by the first outer molding surface 54 of the slide mold 37 and the second cavity 44 is formed by the second cavity 44. The two-ball component member 7 is held on the second outer molding surface 46 of the movable die 35. At this time, the resin material X solidified by the sprue 41, the first sub sprue 57, the runner 47, the first gate 48 and the second gate 49 is removed from the mold.

  Thereafter, the slide die 37 is moved to the rising end position by the moving device 38. Thus, the first ball constituent member 6 and the second ball constituent member 7 face each other, and the sprue 41 and the second sub sprue 58 communicate with each other. Then, as shown in FIG. 9, when the movable die 35 is brought close to the slide die 37 and the die is closed, the first inner side surface 14 of the first ball component member 6 and the second inner side surface of the second ball component member 7. 20 overlaps. At this time, a bonding cavity 56 is formed by the first outer molding surface 54 and the second outer molding surface 46, and a runner 47 and a second gate 49 are formed by the runner recess 50 and the second gate recess 52. Is done. The second gate 49 communicates with the bonding cavity 56. This step is a step of forming the bonding cavity 56.

  Thereafter, as shown in FIG. 10, the resin material in the cylinder 40 is injected from the injection nozzle 40a. This resin material is the adhesive resin material 23 and flows into the runner 47 through the sprue 41 of the fixed die 36 and the second sub sprue 58 of the slide die 37. The adhesive resin material that has flowed into the runner 47 flows from the second gate 49 into the bonding cavity 56 and is solidified.

  In the process of solidifying the bonding resin material 23 that has flowed into the bonding cavity 56, the first ball component member 6 and the second ball component member 7 are welded and integrated by the bonding resin material 23, and the core sphere 3 It becomes. After the adhesive resin material 23 is solidified, as shown in FIG. 11, the movable die 35 is separated from the slide die 37 to be in the mold open state, and the core sphere 3 is removed from the movable die 35 by the eject pin. Resin material X is demolded. This step is a step of obtaining the core sphere 3.

  Next, high-Milan brands 1555 and 1706 are introduced into the cylinder of the secondary injection machine at a volume ratio of 2: 1 and heated and kneaded to obtain a molten state. On the other hand, the upper die 62 of the first skin part forming die 60 is moved upward to open the die, and the core sphere 3 is placed on the lower concave surface 66 of the lower die 63. At this time, the mating portion of the first ball constituent member 6 and the second ball constituent member 7 is made to substantially coincide with the mating portions of the upper die 62 and the lower die 63.

  After that, when the upper mold 62 is moved downward to close the mold, as shown in FIG. 13, the center sphere 3 comes into contact with both the upper molding surface 65 and the lower molding surface 66 and the upper mold 62 and the lower mold While being held by the mold 63, a first skin part forming cavity 67 is formed on the outer surface of the core sphere 3. Then, when the resin material is injected from the injection nozzle of the secondary injection machine, as shown in FIG. 14, the resin material flows from the sprue 64 into the first skin portion forming cavity 67 and is solidified. Become. The first skin portion 25 is welded to and integrated with the outer surface of the core sphere 3. Thereafter, the upper mold 62 is moved upward to make the mold open, and the core sphere 3 integrally molded with the first skin portion 25 is removed from the lower mold 63. The resin material solidified in the sprue 64 is detached from the core sphere 3 when the core sphere 3 is removed from the lower mold 63.

  After the first skin portion 25 is molded, the upper die 70 of the second skin portion molding die 61 is moved upward to open the mold, and the core sphere 3 is mounted on the lower molding surface 73 of the lower die 71. Put. After that, when the upper die 70 is moved downward to close the die, a second skin part forming cavity 74 is formed as shown in FIG. At this time, the first skin portion 25 comes into contact with the upper molding surface 72 and the lower molding surface 73.

  When the first skin portion 25 abuts on the upper molding surface 72 and the lower molding surface 73, the center sphere 3 is held by the upper die 70 and the lower die 71, and the central portion of the second skin portion molding cavity 74. It becomes difficult to shift the position. When the resin material is injected from the injection nozzle of the secondary injection machine, the resin material flows into the runner 76 through the sprue 75. The resin material that has flowed into the runner 76 flows from the four gates 77 into the second skin portion forming cavity 74. The pressure of the resin material flowing into the second skin part forming cavity 74 acts on the outer surface by the opening of the gate 77 facing the outer surface of the core sphere 3. At this time, since the four gates 77 are separated in the circumferential direction of the central sphere 3 so as to surround the central sphere 3, the pressure of the resin material acts on the central sphere 3 from four directions separated in the circumferential direction. Will do. Accordingly, the force received by the core sphere 3 due to the pressure of the resin material is partially offset. Thereby, compared with the case where only one gate is provided, for example, the center sphere 3 is less likely to be displaced in the second skin portion forming cavity 74. Note that the number of gates 77 is not limited to four, and any number of gates 77 may be used.

  The resin material that has flowed into the second skin part forming cavity 74 is solidified to form the second skin part 26 as shown in FIG. The second skin portion 26 is welded to and integrated with the outer surface of the core sphere 3. After the second skin portion 26 is formed, the upper mold 70 is moved upward to open the mold, and the ball 1 is removed from the lower mold 71. The resin material solidified by the sprue 75, the runner 76 and the gate 77 is detached from the ball 1 when the ball 1 is removed from the lower die 71.

  Therefore, according to this embodiment, the first pattern forming portion 8 is provided on the first concave surface 10 of the first ball constituting member 6, and the second pattern forming portion 15 is provided on the second concave surface 16 of the second ball constituting member 7. Therefore, the pattern forming portions 8 and 15 can be positioned away from the surface of the ball 1 toward the center. And since the 1st ball constituent member 6 and the 2nd ball constituent member 7 are formed with a transparent resin material, for example, when a user looks at ball 1, the 1st pattern formation part 8 and the 2nd pattern formation part 15 can be seen in the ball 1 through the resin material forming the ball constituent members 6 and 7. As a result, a pattern with a sense of depth or depth can be formed on the ball 1 without making the surface of the ball 1 uneven, and the merchantability of the ball 1 can be improved.

  In addition, since the first ball component member 6 and the second ball component member 7 are covered with the skin material 4, it is possible to firmly integrate both the ball component members 6 and 7 so as to prevent cracking during use. it can. In this case, since the skin material 4 is formed of a transparent resin material, the pattern forming portions 8 and 15 can be seen through the skin material 4. Thereby, the depth feeling and depth feeling of a pattern can be emphasized more, and merchantability can be improved further.

  In addition, since the first ball constituent member 6 and the second ball constituent member 7 are welded together by the transparent adhesive resin material 23, both the ball constituent members 6 and 7 can be integrated more firmly. Since the adhesive resin material 23 is transparent, the pattern forming portions 8 and 15 are not hidden by the adhesive resin material 23, and the pattern forming portions 8 and 15 can be viewed in the same manner from any direction. Thus, the appearance of the ball 1 can be improved.

  In addition, since the ball constituent members 6 and 7 are made of ionomer resin, the transparency of the pattern forming portions 8 and 15 is improved while ensuring the translucency while satisfying the toughness required for the resin balls. be able to.

  In this embodiment, the first pattern forming unit 8 and the second pattern forming unit 15 have the same shape, but the pattern forming units 8 and 15 may have different shapes. Moreover, you may comprise the shape of the 1st pattern formation part 8 and the 2nd pattern formation part 15 with a curve, a circle | round | yen, and an unevenness | corrugation other than the shape which combines the above-mentioned polygonal surface. Moreover, the 1st pattern formation part 8 and the 2nd pattern formation part 15 can also be comprised with the combination of a color, a character, a figure, etc.

  Further, the resin material forming the first ball constituent member 6, the second ball constituent member 7 and the skin material 4 does not have to be completely colorless and transparent, and has a light-transmitting property capable of visually recognizing the pattern. If you do. Specifically, examples of the color of the resin material include translucent milky white.

  Moreover, you may shape | mold the 1st ball structural member 6, the 2nd ball structural member 7, and the skin material 4 using resin other than ionomer resin.

  Further, in this embodiment, the structure of the mold 33 for forming the core sphere is configured such that the movable mold 35 moves in the horizontal direction, but the movable mold may be structured to move in the vertical direction. The structure of the first skin part mold 60 and the second skin part mold 61 may be a structure in which the movable mold moves in the horizontal direction. In this embodiment, the first skin portion 25 is molded by the first skin portion molding die 60 and the second skin portion 26 is molded by the second skin portion molding die 61. You may make it shape | mold the part 25 and the 2nd skin part 26 with one shaping | molding die.

  Further, the inner core sphere 3 and the skin material 4 may be made of the same resin material. By doing so, the core sphere 3 and the skin material 4 are easily welded.

  In this embodiment, the first ball constituent member 6 and the second ball constituent member 7 are welded together with the adhesive resin material 23. However, the present invention is not limited to this, and the first ball constituent member 6 and the second ball constituent member are not limited thereto. The constituent members 7 may be simply combined without being welded to each other, and may be integrated with the skin material 4. The first ball constituent member 6 and the second ball constituent member 7 may be integrated with an adhesive or the like.

  Moreover, although this embodiment demonstrated the case where the ball | bowl 1 was the 2 layer structure which consists of the center sphere 3 and the skin material 4, this invention is applied also to the ball | bowl of a 1 layer structure or a 3 layer structure. Can do.

  As described above, the resin ball according to the present invention can be used for, for example, park golf.

It is an external view of the resin balls according to the embodiment of the present invention. It is sectional drawing of a ball | bowl. It is the perspective view which looked at the 1st ball constituent member from the 1st concave side. It is the front view which looked at the 1st ball component from the 1st concave side. It is the sectional view on the AA line in FIG. It is sectional drawing which shows schematic structure of a primary shaping | molding apparatus. FIG. 7 is a view corresponding to FIG. 6 in a state where the slide mold is closed at the lowered end position and the resin material is allowed to flow into the cavity. FIG. 7 is a view corresponding to FIG. 6 in a state where the mold is opened after forming the first core constituent member and the second core constituent member. FIG. 7 is a view corresponding to FIG. 6 in a state where the slide mold is closed at the rising end position and the mold is closed to form a joining cavity. FIG. 7 is a view corresponding to FIG. 6 in a state in which a bonding resin material is caused to flow into the bonding cavity. FIG. 7 is a view corresponding to FIG. 6 in a state where the center sphere is removed. It is sectional drawing which shows schematic structure of the shaping | molding die for 1st skin parts. FIG. 13 is a view corresponding to FIG. 12 in a state where the center sphere is held. FIG. 13 is a view corresponding to FIG. 12 immediately after forming the first skin portion. FIG. 17 is a cross-sectional view illustrating a schematic structure of a second skin part forming die and corresponding to the line BB in FIG. 16. It is a top view of the lower mold | type of the shaping | molding die for 2nd skin parts. FIG. 17 is a view corresponding to FIG. 16 in a state where the center sphere is held. FIG. 17 is a view corresponding to FIG. 16 immediately after forming the second skin portion.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Resin ball 2 Cavity part 3 Core sphere 4 Skin material 6 1st ball structural member 7 2nd ball structural member 8 1st pattern formation part 10 1st concave surface 15 2nd pattern formation part 16 2nd concave surface 23 Adhesive resin Material

Claims (4)

A resin ball provided with a cavity,
Comprising a plurality of ball components having concave surfaces for forming the cavity,
Each of the ball constituent members is formed of a resin material having translucency,
A resin ball, wherein the concave surface is provided with a pattern forming portion for forming a pattern visible from the opposite side of the concave surface of the ball constituent member. The resin ball according to claim 1,
The ball component member is covered with a skin material formed of a translucent resin material. The resin ball according to claim 1,
A resin ball characterized in that the concave surfaces of the ball constituent members are bonded to each other with a resin material having translucency in a state of being combined with each other. In the resin balls according to any one of claims 1 to 3,
A resin ball, wherein the ball constituent member is formed of an ionomer resin.

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