Cap and method of manufacturing cap

Abstract

To provide a cap that can suppressing an airbag from being generated and also can be made compact and lightweight.SOLUTION: The present invention relates to a cap 1 which has a cap body 21 fitted to a container, a pour-out cylinder 22 for pouring out a fluid contained in the container, and a lid 23 opening and closing the pour-out cylinder 22. The pour-out cylinder 22 is provided at the cap body 21, and also has a spout 32 at a tip part and a communication hole 33 in communication with the inside of the container at a based end part on the opposite side from the tip part, the pour-out cylinder 22 is provided with a plurality of projection pieces 44 projecting from the communication hole 33 into the pour-out cylinder 22, and a circulation path 45 which extends from the communication hole 33 to the spout 32 via space between the projection pieces 44 is formed in the pour-out cylinder 22.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a cap having a cap body attached to a container, a pouring cylinder for pouring out a fluid accommodated inside the container, and a lid for opening and closing the pouring cylinder, and a method for manufacturing the cap.

Background Art

[0002] Conventionally, as this type of cap, for example, Patent Document 1 below discloses a cap having a cap body attached to the mouth portion of a container, a pouring cylinder for pouring out the contents accommodated inside the container, and a lid for opening and closing the pouring cylinder. The contents are a paste-like viscous substance, such as ginger, garlic, or emulsified mayonnaise.

[0003] The pouring cylinder is provided on the cap body. The lid is connected to the cap body via a hinge. The cap body has an outer cylinder portion that fits over the mouth portion of the container and an inner cylinder portion that is inserted into the mouth portion of the container. The inside of the inner cylinder portion communicates with the inside of the pouring cylinder.

[0004] An inner stopper is fitted between the outer cylinder portion and the inner cylinder portion. The inner stopper can be inserted into the mouth portion of the container together with the inner cylinder portion, and has an inner outlet that communicates with the inside of the inner cylinder portion and a plurality of elastically deformable stopper pieces that open and close the inner outlet.

[0005] According to this, by opening the lid and pressing the container from the outside, the contents of the container are poured out from the inside of the inner cylinder portion through the inner outlet, through the inside of the pouring cylinder, and to the outside. At this time, since the stopper pieces are pushed by the contents and deformed in the opening direction, the inner outlet opens, and a part of the contents heads toward the retention space portion, and the retention space portion is filled with the contents.

[0006] After that, when the pressing of the container is released and the container is restored, the contents remaining in the retention space portion rest on the stopper pieces, and the stopper pieces can prevent the contents from flowing back, so that the contents are likely to stay in the retention space portion, and the effect of suppressing the generation of an air bag can be obtained.

[0007] Incidentally, an air back is a phenomenon in which, after the contents are poured out from the pouring cylinder, when the container is restored, external air is sucked into the pouring cylinder and flows into the container. When such an air back occurs, the contents in the container may be oxidized by the air flowing into the container, resulting in a deterioration in the quality of the contents.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0009] However, in the above conventional form, since the inner stopper is provided with a stopper piece for preventing the backflow of the contents, the cap requires an inner stopper as a separate member from the cap body and the lid. As a result, there is a problem that the number of parts constituting the cap increases, making it difficult to reduce the size and weight of the cap. An object of the present invention is to provide a cap and a method for manufacturing the cap that can suppress the occurrence of an air back and can be reduced in size and weight.

Means for Solving the Problems

[0010] In order to achieve the above object, the first invention is a cap having a cap body attached to a container, a pouring cylinder for pouring out a fluid accommodated inside the container, and a lid for opening and closing the pouring cylinder, the pouring cylinder is provided in the cap body, has a pouring port at its tip, and has a communication port communicating with the inside of the container at the base end portion opposite to the tip portion, a plurality of protruding pieces protruding into the pouring cylinder are provided on the pouring cylinder, and a flow passage passing through between the protruding pieces from the communication port and reaching the pouring port is formed inside the pouring cylinder.

[0011] According to this, by opening the lid and pressing the container from the outside to compress it, the fluid in the container passes between the protruding pieces, flows through the flow path, and is poured out from the pouring outlet to the outside. Then, when the pressing of the container is released and the container returns to its original state, the reverse flow of the fluid in the pouring cylinder is restricted by the protruding pieces. As a result, it is possible to suppress the fluid in the pouring cylinder from returning into the container through the communication port of the pouring cylinder, the fluid in the pouring cylinder remains in the pouring cylinder, and the pouring cylinder is blocked by the fluid. Therefore, it is possible to suppress the occurrence of an air backflow in which external air is sucked from the pouring cylinder and flows into the container.

[0012] In addition, since the cap has a cap body and a lid, and the pouring cylinder and the protruding pieces for restricting the reverse flow of the fluid are provided on the cap body, the number of components constituting the cap is reduced, and the cap can be made smaller and lighter.

[0013] In the cap according to the second invention, the protruding pieces are provided at a plurality of locations in the circumferential direction of the pouring cylinder and are arranged around the flow path. In the cap according to the third invention, a gap is formed between the adjacent protruding pieces in the circumferential direction.

[0014] In the cap according to the fourth invention, the tip of the protruding piece is inclined in the direction facing the pouring outlet.

[0015] According to this, the fluid easily flows in the pouring cylinder in the pouring direction from the communication port toward the pouring outlet, and conversely, it is difficult to flow in the return direction from the pouring outlet toward the communication port. Therefore, when the container is pressed, the fluid can be smoothly poured out from the pouring outlet, and when the pressing of the container is released, the fluid easily remains in the pouring cylinder.

[0016] In the cap according to the fifth invention, the protruding piece is elastically deformable around the attachment root in the pouring direction in which the fluid flows from the inside of the container toward the pouring outlet and in the return direction opposite to the pouring direction and returning from the pouring outlet to the container side.

[0017] According to this, by pressing and compressing the container from the outside, the fluid in the container flows through the flow passage and is poured out from the pouring outlet to the outside. At this time, since the protruding piece is pushed by the fluid and deformed in the pouring direction, the flow resistance that the fluid receives from the protruding piece decreases, and the fluid is smoothly poured out from the pouring outlet.

[0018] After that, when the pressing of the container is released and the container returns to its original shape, the protruding piece is deformed in the returning direction and returns to its original shape. Therefore, the backflow of the fluid in the pouring cylinder is restricted by the protruding piece, and the fluid in the pouring cylinder remains in the pouring cylinder.

[0019] The sixth invention is a cap having a cap body attached to the container, a pouring cylinder for pouring out the fluid accommodated inside the container, and a lid for opening and closing the pouring cylinder, The pouring cylinder is provided on the cap body, The cap body has an outer cylinder portion that is externally fitted to the container and an inner cylinder portion that is fitted into the container. The inside of the inner cylinder portion and the inside of the pouring cylinder communicate with each other through a communication port. The tip of the inner cylinder portion on the side opposite to the communication port is open. A plurality of protruding pieces protruding radially inward of the inner cylinder portion are provided on the inner cylinder portion. A flow passage is formed that passes between the protruding pieces and reaches the inside of the pouring cylinder from the inside of the inner cylinder portion through the communication port.

[0020] According to this, by opening the lid and pressing and compressing the container from the outside, the fluid in the container passes between the protruding pieces, flows through the flow passage, and is poured out from the pouring cylinder to the outside. After that, when the pressing of the container is released and the container returns to its original shape, the backflow of the fluid in the pouring cylinder and the inner cylinder portion is restricted by the protruding piece. As a result, it is possible to suppress the fluid inside the pouring cylinder and the inner cylinder portion from returning to the container, and the fluid remains inside the pouring cylinder and the inner cylinder portion, and the pouring cylinder is blocked by the fluid. For this reason, it is possible to suppress the occurrence of an air backflow in which external air is sucked into the pouring cylinder and flows into the container.

[0021] In addition, since the cap has a cap body and a lid, and the cap body is provided with a pouring cylinder and a protruding piece for restricting the backflow of the fluid, the number of components constituting the cap is reduced, and the cap can be made smaller and lighter.

[0022] In the cap according to the seventh invention, the protruding pieces are provided at a plurality of locations in the circumferential direction of the inner cylinder portion and are arranged around the flow passage. In the cap according to the eighth invention, a gap is formed between the adjacent protruding pieces in the circumferential direction. In the cap according to the ninth invention, the tip of the protruding piece is inclined in a direction facing away from the pouring cylinder.

[0023] In the cap according to the tenth invention, the protruding piece is elastically deformable about the attachment base in the pouring direction in which the fluid flows from the container into the pouring cylinder and the return direction in which the fluid returns from the pouring cylinder to the container side opposite to the pouring direction.

[0024] According to this, by pressing and compressing the container from the outside, the fluid in the container flows through the flow passage and is poured out from the pouring cylinder to the outside. At this time, since the protruding piece is pushed by the fluid and deformed in the pouring direction, the flow resistance received by the fluid from the protruding piece is reduced, and the fluid is smoothly poured out from the pouring cylinder.

[0025] After that, when the pressing of the container is released and the container is restored, the protruding piece is deformed in the return direction and returns to its original shape, so that the backflow of the fluid in the pouring cylinder is restricted by the protruding piece, and the fluid remains inside the pouring cylinder and the inner cylinder portion.

[0026] In the cap according to the eleventh invention, the cap body can be attached to the container via a screw. In the cap according to the twelfth invention, the lid is connected to the cap body via a hinge.

[0027] The thirteenth invention is a manufacturing method for manufacturing the cap according to the fourth invention by injection molding, In a mold release process of releasing a synthetic resin material solidified in a mold from the mold, a predetermined core forming the inside of a pouring cylinder is released in a release direction from a communication port of the pouring cylinder toward a pouring outlet.

[0028] According to this, in the mold release process, since the predetermined core moves and is released in the release direction from the communication port of the pouring cylinder toward the pouring outlet, the release direction and the inclination direction of the protruding piece are substantially in the same direction. As a result, the predetermined core is smoothly released in the release direction, and it is difficult for an excessive external force to act on the protruding piece from the predetermined core.

Advantages of the Invention

[0029] As described above, according to the present invention, it is possible to suppress the generation of an air bag, reduce the size and weight of the cap, and achieve cost reduction.

Brief Description of the Drawings

[0030]

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Mode for Carrying Out the Invention

[0031] Hereinafter, embodiments of the present invention will be described with reference to the drawings. (First Embodiment)

[0032] The first embodiment will be described with reference to FIGS. 1 to 9. As shown in FIGS. 1 to 3, 1 is a cap attached to the mouth portion 3 of the container 2. Here, the axial direction 6 of the cap 1 is defined as the vertical direction, the direction orthogonal to the axis 7 of the cap 1 is defined as the radial direction 8, and the circumferential direction centered on the axis 7 of the cap 1 is defined as the circumferential direction 9.

[0033] Inside the container 2, for example, a highly viscous fluid 14 such as shredded raw ginger or shredded raw garlic is accommodated. Incidentally, the fluid 14 may be a paste-like viscous substance, or may further be an emulsified viscous substance such as mayonnaise or ketchup.

[0034] The container 2 is a flexible and elastically deformable synthetic resin container, which can be in the shape of a bag, a tube or other shapes. An external male thread 16 is formed on the outer periphery of the mouth portion 3. The cap 1 has a cap body 21 attached to the mouth portion 3 of the container 2, a pouring cylinder 22 for pouring out the fluid 14, and a lid 23 for opening and closing the pouring cylinder 22.

[0035] The cap body 21 has an outer cylinder portion 25 externally fitted to the mouth portion 3 of the container 2, an inner cylinder portion 26 fitted into the inside of the mouth portion 3, and a disc-shaped partition wall portion 27 separating the inside of the mouth portion 3 from the outside of the pouring cylinder 22.

[0036] The outer cylinder portion 25 and the inner cylinder portion 26 extend downward from the partition wall portion 27. A mounting groove 28 is formed over the entire circumference between the outer cylinder portion 25 and the inner cylinder portion 26. The mounting groove 28 is a groove with an open lower part and a closed upper part by the partition wall portion 27.

[0037] An internal female thread 30 is formed on the inner circumference of the outer cylinder portion 25. As shown in FIG. 1, the male thread 16 of the mouth portion 3 of the container 2 and the female thread 30 of the outer cylinder portion 25 are screwed together, and the tip of the mouth portion 3 is inserted into the mounting groove 28, whereby the cap body 21 is attached to the container 2.

[0038] The pouring cylinder 22 is provided on the partition wall portion 27 of the cap body 21, has a pouring port 32 at its tip (upper end), and has a communication port 33 communicating with the inside of the mouth portion 3 at the base end portion (lower end) opposite to the tip. The base end portion (lower end) of the pouring cylinder 22 projects from the partition wall portion 27 toward the inside of the inner cylinder portion 26. An annular seal wall portion 34 protruding upward is provided on the partition wall portion 27. The seal wall portion 34 is formed so as to surround the outside of the pouring cylinder 22.

[0039] The lid 23 is connected to the cap body 21 via a hinge 36. The lid 23 has a circular top plate portion 38, a cylindrical skirt portion 39 hanging down from the outer peripheral edge of the top plate portion 38, a cylindrical first sealing cylinder 40, and a cylindrical second sealing cylinder 41. The second sealing cylinder 41 is provided between the skirt portion 39 and the first sealing cylinder 40.

[0040] As shown in FIG. 1, in the closed plug state where the lid 23 is closed, the tip of the first sealing cylinder 40 is inserted into the spout 32 of the spout cylinder 22, and the outer periphery of the tip of the first sealing cylinder 40 and the inner periphery of the spout 32 of the spout cylinder 22 are in close contact over the entire circumference, and the sealing wall portion 34 is fitted between the skirt portion 39 and the second sealing cylinder 41.

[0041] At the base end portion (lower end portion) of the spout cylinder 22, a plurality of fan-shaped protruding pieces 44 protruding into the spout cylinder 22 from the communication port 33 are provided. A flow passage 45 passing through between the protruding pieces 44 from the communication port 33 and reaching the spout 32 is formed in the spout cylinder 22.

[0042] The protruding pieces 44 are provided at a plurality of locations in the circumferential direction 9 of the spout cylinder 22 and are arranged around the flow passage 45. A gap 46 is formed between adjacent protruding pieces 44 in the circumferential direction 9. The tip of the protruding piece 44 is inclined in the direction (upward) facing the spout 32.

[0043] As shown in FIG. 4, the protruding piece 44 is elastically deformable about the attachment root portion in the pouring direction 48 (see the virtual line) in which the fluid 14 flows from the container 2 toward the spout 32 and the return direction 49 (see the solid line) returning from the spout 32 to the container 2 side opposite to the pouring direction 48. Hereinafter, the operation of the above configuration will be described.

[0044] By opening the lid 23 and pressing the container 2 from the outside to cause compressive deformation (squeeze), the fluid 14 inside the container 2 passes between the protruding pieces 44, flows through the flow passage 45, and is poured out from the pouring outlet 32 to the outside. At this time, since the tip of the protruding piece 44 is inclined in the direction facing the pouring outlet 32, the fluid 14 easily flows in the pouring direction 48 inside the pouring cylinder 22. Further, as shown by the phantom line in FIG. 4, when the protruding piece 44 is pushed by the fluid 14 and deformed in the pouring direction 48, the flow resistance that the fluid 14 receives from the protruding piece 44 decreases. As a result, the fluid 14 is smoothly poured out from the pouring outlet 32.

[0045] After that, when the pressing of the container 2 is released and the container 2 is restored, as shown by the solid line in FIG. 4, the protruding piece 44 is deformed in the return direction 49 and returns to its original shape, and the backflow of the fluid 14 in the pouring cylinder 22 is restricted by the protruding piece 44. As a result, as shown in FIG. 5, it is possible to suppress the fluid 14 in the pouring cylinder 22 from returning into the container 2 through the communication port 33 of the pouring cylinder 22, and the fluid 14 in the pouring cylinder 22 remains in the pouring cylinder 22, and the pouring cylinder 22 is blocked by the fluid 14. Therefore, it is possible to suppress the occurrence of an air backflow in which external air is sucked into the container 2 from the pouring cylinder 22.

[0046] At this time, since the tip of the protruding piece 44 is inclined in the direction facing the pouring outlet 32, the fluid 14 hardly flows in the return direction 49 inside the pouring cylinder 22, and the fluid 14 easily remains in the pouring cylinder 22.

[0047] Further, since the cap 1 has a cap body 21 and a lid 23, and the pouring cylinder 22 and the protruding piece 44 for restricting the backflow of the fluid 14 are provided on the cap body 21, the number of components constituting the cap 1 is reduced, and the cap 1 can be made smaller and lighter.

[0048] As shown in FIG. 1, by closing the lid 23, the tip of the first sealing cylinder 40 is inserted into the pouring outlet 32 of the pouring cylinder 22, and the outer periphery of the tip of the first sealing cylinder 40 and the inner periphery of the pouring outlet 32 of the pouring cylinder 22 are in close contact over the entire circumference, and the sealing wall portion 34 is fitted between the skirt portion 39 and the second sealing cylinder 41. Thereby, the inside of the pouring cylinder 22 and the outside of the lid 23 are surely sealed.

[0049] Next, a manufacturing method for manufacturing the cap 1 by injection molding will be described. As shown in FIG. 10, reference numeral 71 denotes a mold used when injection molding the cap 1 in the opened state shown in FIG. 2. The mold 71 has a lower mold 72 that forms the lower side of the cap body 21 and the outer side of the lid 23, and an upper mold 73 that forms the upper side of the cap body 21 and the inner side of the lid 23.

[0050] The lower mold 72 has a center core 75, a screw core 76, and the like. The upper mold 73 has a nozzle inner core 78 (an example of a predetermined core) that forms the inside of the pouring cylinder 22, a nozzle outer core 79 that forms the outside of the pouring cylinder 22, and the like.

[0051] The manufacturing method of the cap 1 includes a filling step of filling the molding product space inside the mold 71 with the molten synthetic resin material 82 as shown by the solid line in FIG. 10, a cooling step of cooling and solidifying the filled synthetic resin material 82, and a mold release step of releasing the synthetic resin material 82 cooled and solidified in the mold 71 from the mold 71.

[0052] According to this, first, the filling step is performed, then the cooling step is performed, and then the mold release step is performed. In the mold release step, first, as shown by the virtual line in FIG. 10, the nozzle inner core 78 is moved upward 83 (an example of the release direction facing from the communication port 33 of the pouring cylinder 22 to the pouring outlet 32) to release the mold. At this time, since the release direction (in this case, the upward direction 83) and the inclination direction of the protruding piece 44 are substantially the same direction, the nozzle inner core 78 is smoothly released upward 83, and thus it is difficult for an excessive external force to act on the protruding piece 44 from the nozzle inner core 78.

[0053] After that, the outer core 79 of the nozzle is moved upward in the direction 83 to release the mold, and further, the center core 75, the screw core 76, etc. are sequentially moved downward in the direction 84 to release the mold, whereby the synthetic resin cap 1 shown in FIG. 2 is manufactured.

[0054] (Second Embodiment) The second embodiment will be described below with reference to FIGS. 11 to 16. The same members as those in the first embodiment described above are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0055] As shown in FIGS. 11 to 13, the inside of the inner cylinder portion 26 and the inside of the pouring cylinder 22 communicate with each other through the communication port 33. The inner cylinder portion 26 has an opening at the tip (lower end) on the side opposite to the communication port 33.

[0056] The inner cylinder portion 26 is provided with a plurality of fan-shaped protruding pieces 61 protruding radially inward from the tip (lower end). A flow path 62 is formed that passes between the protruding pieces 61 and reaches the inside of the pouring cylinder 22 from the inside of the inner cylinder portion 26 through the communication port 33.

[0057] The protruding pieces 61 are provided at a plurality of positions in the circumferential direction 9 of the inner cylinder portion 26 and are arranged around the flow path 62. A gap 63 is formed between the adjacent protruding pieces 61 in the circumferential direction 9.

[0058] The tip of the protruding piece 61 is inclined in the direction (downward) facing away from the pouring cylinder 22. As shown in FIG. 14, the protruding piece 61 is elastically deformable about the base portion in the pouring direction 48 (see the virtual line) in which the fluid 14 flows from the container 2 toward the pouring cylinder 22 and the return direction 49 (see the solid line) from the pouring cylinder 22 back to the container 2 side opposite to the pouring direction 48. The operation of the above configuration will be described below.

[0059] By opening the lid 23 and pressing the container 2 from the outside to cause compressive deformation (squeeze), the fluid 14 inside the container 2 passes between the protruding pieces 61, flows through the flow passage 62, and is poured out from the spout 32 to the outside. At this time, as shown by the phantom line in FIG. 9, since the protruding pieces 61 are pushed by the fluid 14 and deformed in the pouring direction 48, the flow resistance that the fluid 14 receives from the protruding pieces 61 decreases, and the fluid 14 is smoothly poured out from the spout 32.

[0060] After that, when the pressing of the container 2 is released and the container 2 is restored, as shown by the solid line in FIG. 14, the protruding pieces 61 are deformed in the return direction 49 and return to their original shape, and the backflow of the fluid 14 inside the spout cylinder 22 and the inner cylinder portion 26 is restricted by the protruding pieces 61. As a result, as shown in FIG. 15, it is possible to suppress the fluid 14 inside the spout cylinder 22 and the inner cylinder portion 26 from returning into the container 2, and the fluid 14 remains inside the spout cylinder 22 and the inner cylinder portion 26, and the spout cylinder 22 is blocked by the fluid 14. For this reason, it is possible to suppress the occurrence of an air bag in which external air is sucked from the spout cylinder 22 and flows into the container 2.

[0061] Further, since the cap 1 has a cap body 21 and a lid 23, and the spout cylinder 22 and the protruding pieces 61 for restricting the backflow of the fluid 14 are provided on the cap body 21, the number of components constituting the cap 1 is reduced, and the cap 1 can be made smaller and lighter.

[0062] As shown in FIG. 11, by closing the lid 23, the tip of the first sealing cylinder 40 is inserted into the spout 32 of the spout cylinder 22, and the outer periphery of the tip of the first sealing cylinder 40 and the inner periphery of the spout 32 of the spout cylinder 22 are in close contact over the entire circumference, and the seal wall portion 34 is fitted between the skirt portion 39 and the second sealing cylinder 41. Thereby, the inside of the spout cylinder 22 and the outside of the lid 23 are reliably sealed.

[0063] In the above first embodiment, as shown in FIG. 3, six protruding pieces 44 are provided, but the number is not limited to six, and a plurality of pieces other than six may be provided. In the above-described first embodiment, as shown in FIG. 1, although the protruding piece 44 is inclined in the direction in which the tip portion faces the pouring outlet 32 (upward), it may be inclined in the direction in which the tip portion faces the side opposite to the pouring outlet 32 (downward). Further, the protruding piece 44 may protrude in the horizontal direction without being inclined.

[0064] In the above-described second embodiment, as shown in FIG. 13, although ten protruding pieces 61 are provided, the number is not limited to ten, and a plurality of pieces other than ten may be provided. In the above-described second embodiment, as shown in FIG. 11, although the protruding piece 61 is inclined in the direction in which the tip portion faces the side opposite to the pouring cylinder 22 (downward), it may be inclined in the direction in which the tip portion faces the pouring cylinder 22 (upward). Further, the protruding piece 61 may protrude in the horizontal direction without being inclined.

[0065] (Third to Tenth Embodiments) The third to tenth embodiments, which are modifications of the above-described first embodiment, are shown in FIGS. 17A to 24C. In these third to tenth embodiments, the number, inclination direction, inclination angle, etc. of the protruding pieces 44 are changed.

[0066] Incidentally, FIGS. 17A to 17C show the cap 1 of the third embodiment. FIGS. 18A to 18C show the cap 1 of the fourth embodiment. FIGS. 19A to 19C show the cap 1 of the fifth embodiment. FIGS. 20A to 20C show the cap 1 of the sixth embodiment. FIGS. 21A to 21C show the cap 1 of the seventh embodiment. FIGS. 22A to 22C show the cap 1 of the eighth embodiment. FIGS. 23A to 23C show the cap 1 of the ninth embodiment. FIGS. 24A to 24C show the cap 1 of the tenth embodiment.

[0067] (Eleventh to Eighteenth Embodiments) The eleventh to eighteenth embodiments, which are modifications of the above-described second embodiment, are shown in FIGS. 25A to 32C. In these eleventh to eighteenth embodiments, the number, inclination direction, inclination angle, etc. of the protruding pieces 44 are changed.

[0068] Incidentally, FIGS. 25A to 25C show the cap 1 of the eleventh embodiment. FIGS. 26A to 26C show the cap 1 of the twelfth embodiment. FIGS. 27A to 27C show the cap 1 of the thirteenth embodiment. FIGS. 28A to 28C show the cap 1 of the fourteenth embodiment. FIGS. 29A to 29C show the cap 1 of the fifteenth embodiment. FIGS. 30A to 30C show the cap 1 of the sixteenth embodiment. FIGS. 31A to 31C show the cap 1 of the seventeenth embodiment. FIGS. 32A to 32C show the cap 1 of the eighteenth embodiment.

[0069] In addition, in the first to eighteenth embodiments described above, the shapes of the cap 1 and the protruding pieces 44 and 61 all create a sense of beauty through vision. Also, in the first to eighteenth embodiments, although there are a plurality of the protruding pieces 44 and 61 respectively, they are integrally created because they function together to regulate the backflow of the fluid 14. Therefore, the plurality of protruding pieces 44 and 61 in each of the above embodiments have functional integrity.

Explanation of Reference Numerals

[0070] 1 Cap 2 Container 9 Circumferential direction 14 Fluid 16 Male thread 21 Cap body 22 Pouring cylinder 23 Lid 25 Outer cylinder part 26 Inner cylinder part 30 Female thread 32 Pouring outlet 33 Communication port 36 Hinge 44 Protruding piece 45 Flow path 46 Gap 48 Pouring direction 49 Return direction 61 Protruding piece 62 Flow path 63 Gap 71 Mold 78 Nozzle inner core (predetermined core) 82 Synthetic resin material 83 Upward (detachment direction)

Claims

1. A cap having a cap body attached to a container, a spout tube for pouring out a fluid accommodated inside the container, and a lid for opening and closing the spout tube, wherein the spout tube is provided on the cap body, has a spout opening at its tip, and has a communication port communicating with the inside of the container at a base end portion opposite to the tip portion, a plurality of protruding pieces protruding into the spout tube are provided on the spout tube, a flow passage passing through between the protruding pieces from the communication port and reaching the spout opening is formed inside the spout tube, and the cap is characterized by this.

2. The protruding pieces are provided at a plurality of locations in the circumferential direction of the spout tube and are arranged around the flow passage, and the cap according to claim 1 is characterized by this.

3. A gap is formed between adjacent protruding pieces in the circumferential direction, and the cap according to claim 2 is characterized by this.

4. The tip of the protruding piece is inclined in the direction facing the spout opening, and the cap according to claim 1 is characterized by this.

5. The protruding piece is elastically deformable around its base portion in the pouring direction in which the fluid flows from the inside of the container toward the spout opening and in the return direction in which the fluid returns from the spout opening to the container side, which is opposite to the pouring direction, and the cap according to claim 1 is characterized by this.

6. A cap having a cap body attached to a container, a spout tube for pouring out a fluid accommodated inside the container, and a lid for opening and closing the spout tube, wherein the spout tube is provided on the cap body, the cap body has an outer cylinder portion externally fitted to the container and an inner cylinder portion fitted into the container, the inside of the inner cylinder portion and the inside of the spout tube communicate with each other through a communication port, the tip portion of the inner cylinder portion on the side opposite to the communication port is open, a plurality of protruding pieces protruding radially inward of the inner cylinder portion are provided on the inner cylinder portion, a flow passage passing through between the protruding pieces and reaching the inside of the spout tube through the communication port from the inside of the inner cylinder portion is formed, and the cap is characterized by this.

7. The protruding pieces are provided at a plurality of locations in the circumferential direction of the inner cylinder portion and are arranged around the flow passage, and the cap according to claim 6 is characterized by this.

8. A gap is formed between adjacent protruding pieces in the circumferential direction, and the cap according to claim 7 is characterized by this.

9. The tip of the protruding piece is inclined in the direction facing away from the spout tube, and the cap according to claim 6 is characterized by this.

10. The protruding piece is characterized in that it can be elastically deformed around the attachment base in the pouring direction in which the fluid flows from the container into the pouring cylinder and in the return direction from the pouring cylinder back to the container side opposite to the pouring direction, according to claim 6 of the cap.

11. The cap according to claim 1 or claim 6, characterized in that the cap body can be attached to the container via a screw.

12. The cap according to claim 1 or claim 6, characterized in that the lid is connected to the cap body via a hinge.

13. A manufacturing method for manufacturing the cap according to claim 4 by injection molding, In the mold release step of releasing the synthetic resin material solidified in the mold from the mold, a predetermined core forming the inside of the pouring cylinder is released in the release direction from the communication port of the pouring cylinder toward the pouring outlet, which is a manufacturing method of the cap.

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