Cap and its production method

Abstract

To provide a cap capable of deterring deformation of protruding pieces after mold release.SOLUTION: A cap 1 has a cap body 11 that is attached to a container 2, a pouring cylinder 13 that pours out the fluid in the container 2, and a lid 14 that opens and closes the pouring cylinder 13. The pouring cylinder 13 is provided in the cap body 11 and has an outlet 37 at the tip and a connecting port 38 at the root end 13a that is connected to the inside of the container 2. A plurality of protruding pieces 50 protruding inwardly in the radial direction of the pouring cylinder 13 are provided at the root end 13a of the pouring cylinder 13, the protruding pieces 50 are connected to the root end 13a of the pouring cylinder 13 on the outside of the pouring cylinder 13, and a distribution channel 55 is formed in the pouring cylinder 13 that passes between the protruding pieces 50 and leads from the connecting port 38 to the outlet 37.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a cap attached to a container and a method for manufacturing the cap.

Background Art

[0002] Conventionally, as this type of cap, as described in Patent Document 1 below, there is a bottle cap having a mounting body adapted to be mounted on the mouth portion of a bottle and a lid body for closing the opening of the mounting body. Inside the mounting body of such a cap, a plurality of blades are provided to block a part of the passage through which the content flows, so that the flow rate of the content is restricted.

[0003] The mounting body has a cylindrical portion surrounding the outer peripheral surface of the mouth portion of the bottle and a spout formed inside the cylindrical portion. The spout has a double cylinder structure having an inner cylindrical portion and an outer cylindrical portion, the inner cylindrical portion protruding above the mouth portion of the bottle, and the lower end portion of the outer cylindrical portion being along the inner peripheral surface of the mouth portion of the bottle.

[0004] The passage through which the content flows is formed inside the inner cylindrical portion and the outer cylindrical portion of the spout. The blades are provided on the inner peripheral surface of the outer cylindrical portion between the upper and lower end portions of the outer cylindrical portion, and the tip portion on the central side of the passage is inclined so as to descend.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the above conventional form, when the cap is injection-molded, the core of the mold that forms the inside of the outer cylindrical portion of the sprue is separated downward from the outer cylindrical portion. At this time, since the root end portion of the blade is connected to the inner peripheral surface of the outer cylindrical portion, the core is caught by the root end portion of the blade while moving downward, increasing the release resistance of the core, and the root end portion of the blade is significantly deformed by the excessive force received from the core. As a result, even after demolding, the shape of the blade does not return to the shape assumed in the design, and deformation remains in the blade. For example, there is a risk that the actual inclination angle of the blade with respect to the horizontal plane after demolding becomes steeper than the inclination angle assumed in the design.

[0007] An object of the present invention is to provide a cap and a method for manufacturing the cap that can suppress deformation of the protruding piece after demolding.

Means for Solving the Problems

[0008] 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 on the cap body, has a pouring port at the tip, and has a communication port communicating with the inside of the container at the root end portion opposite to the tip, A plurality of protruding pieces protruding inward in the radial direction of the pouring cylinder are provided at the root end portion of the pouring cylinder, The protruding pieces are connected to the root end portion of the pouring cylinder outside the pouring cylinder, A flow passage passing through between the protruding pieces and leading from the communication port to the pouring port is formed inside the pouring cylinder.

[0009] According to this, the fluid in the container is poured out to the outside from the pouring port through the inside of the pouring cylinder from the communication port. At this time, since the protruding pieces serve as a resistance to the flow of the fluid and suppress the momentum of the fluid, it is possible to prevent the fluid from jumping out vigorously from the pouring port.

[0010] Also, when manufacturing the cap by injection molding, the core forming the inside of the injection cylinder is released in the release direction facing from the injection port of the injection cylinder to the communication port. At this time, since the protruding piece is connected to the base end portion of the injection cylinder on the outside of the injection cylinder, the core presses the protruding piece while moving in the release direction inside the injection cylinder, but it is difficult to catch on the base end portion of the protruding piece and smoothly moves in the release direction while sliding on the protruding piece. As a result, the release resistance of the core is reduced, and the force acting on the base end portion of the protruding piece from the core is decreased, so that it is possible to prevent deformation from remaining in the protruding piece after release.

[0011] The cap in the second invention has a protruding piece having an inclined portion inclined in a direction opposite to the injection port.

[0012] According to this, when manufacturing the cap by injection molding, it is possible to prevent deformation from remaining in the protruding piece after release, so that it is possible to prevent the actual inclination angle of the inclined portion of the protruding piece after release from deviating significantly from the inclination angle assumed in the design.

[0013] The cap in the third invention has a protruding piece having a straight extension portion extending in a direction opposite to the injection port from the base end portion of the injection cylinder, and the inclined portion is provided at the end of the straight extension portion.

[0014] According to this, since the straight extension portion is formed on the protruding piece, when manufacturing the cap by injection molding, the core moves more smoothly in the release direction while sliding on the protruding piece, the release resistance of the core becomes even smaller, and it is possible to prevent deformation from remaining in the protruding piece after release.

[0015] The cap in the fourth invention has a sealing protrusion provided inside the lid, the injection cylinder has a cylinder main body provided on the cap main body and an annular extension piece extending radially inward from the tip of the cylinder main body and in the direction of the base end portion of the injection cylinder, a gap portion is formed between the inner circumference of the cylinder main body and the outer circumference of the extension piece, In the closed state, the sealing protrusion of the closed lid is inserted into the inside of the pouring cylinder from the pouring outlet, and the outer periphery of the sealing protrusion is in close contact with the inner periphery of the extending piece.

[0016] According to this, in the closed state, since the outer periphery of the sealing protrusion of the lid is in close contact with the inner periphery of the extending piece of the pouring cylinder, the tip of the pouring cylinder and the lid are sealed in a closed state.

[0017] In addition, since a gap is formed between the inner periphery of the cylinder body of the pouring cylinder and the outer periphery of the extending piece, the extending piece is likely to deform outward in the radial direction of the pouring cylinder. Therefore, when closing and sealing the lid, the force required to insert the sealing protrusion into the inside of the pouring cylinder from the pouring outlet (hereinafter referred to as the closing force) is reduced.

[0018] In addition, when opening and unsealing the lid, the extending piece easily deforms outward in the radial direction of the pouring cylinder, so that the frictional resistance is reduced, and the force required to remove the sealing protrusion from the pouring outlet to the outside of the pouring cylinder is reduced. As a result, the lid can be opened and closed lightly and smoothly to perform unsealing and sealing.

[0019] The fifth invention is a manufacturing method for manufacturing the cap described in the first invention 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 facing from the pouring outlet of the pouring cylinder to the communication port.

[0020] According to this, when the predetermined core is released in the release direction, the predetermined core presses the protruding piece while moving in the release direction inside the pouring cylinder. However, since the protruding piece is connected to the root end portion of the pouring cylinder outside the pouring cylinder, the predetermined core is difficult to be caught by the root end portion of the protruding piece and smoothly moves in the release direction while sliding in contact with the protruding piece. As a result, the mold release resistance of the predetermined core is reduced, the force acting on the root end portion of the protruding piece from the predetermined core is reduced, and it is possible to prevent deformation from remaining in the protruding piece after mold release.

Effects of the Invention

[0021] According to the present invention as described above, when the cap is injection-molded, it is possible to prevent deformation from remaining in the protruding piece after demolding. Therefore, it is possible to prevent the actual inclination angle of the inclined portion of the protruding piece after demolding from deviating significantly from the inclination angle assumed in the design.

Brief Description of the Drawings

[0022]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Embodiments for Carrying Out the Invention

[0023] Hereinafter, embodiments of the present invention will be described with reference to the drawings. (First Embodiment)

[0024] In the first embodiment, as shown in FIGS. 1 to 4, 1 is a hinged cap attached to the mouth portion 3 of the container 2. Here, the axial direction 6 of the cap 1 is the vertical direction, the direction orthogonal to the axis 7 passing through the center of the cap 1 is the radial direction 8, and the circumferential direction centered on the axis 7 of the cap 1 is defined as the circumferential direction 9.

[0025] The cap 1 is made of synthetic resin and has a cap body 11 attached to the mouth portion 3 of the container 2, a pouring cylinder 13 for pouring out a liquid seasoning such as soy sauce (an example of a fluid) accommodated inside the container 2, and a lid 14 for opening and closing the pouring cylinder 13. The lid 14 is connected to the cap body 11 via a hinge 15.

[0026] The cap body 11 has a pouring cylinder 13 and a pedestal portion 16 fitted to the mouth portion 3 of the container 2. The pedestal portion 16 has an outer cylinder 18, an inner cylinder 19, and a partition wall 20 separating the inside of the container 2 from the outside of the pouring cylinder 13.

[0027] The partition wall 20 is formed in a disk shape in plan view. The outer cylinder 18 and the inner cylinder 19 extend downward from the outer peripheral edge of the partition wall 20. A mounting groove 21 is formed over the entire circumference between the outer cylinder 18 and the inner cylinder 19. The mounting groove 21 is a groove with an open lower part and a closed upper part by the partition wall 20. The cap body 11 is attached to the container 2 by fitting the mouth portion 3 into the mounting groove 21 from below.

[0028] A projecting piece 23 projecting upward is formed over the entire circumference on the outer peripheral edge of the partition wall 20. A concave portion 24 recessed inward in the radial direction 8 is formed over the entire circumference on the outer periphery of the projecting piece 23.

[0029] The pouring cylinder 13 has a pouring outlet 37 at its tip (upper end), and a communication port 38 that communicates with the inside of the container 2 at the root end portion 13a (lower end) on the side opposite to the tip. Further, the pouring cylinder 13 has a cylindrical cylinder body 26 erected on the partition wall 20, and an annular extension piece 28 that extends radially inward from the tip of the cylinder body 26 and in the direction of the root end portion 13a of the pouring cylinder 13 (i.e., downward). The extension piece 28 has a pointed tip (lower end) and a cross-sectional shape in which the thickness gradually decreases toward the tip. A gap portion 29 (see FIG. 4) is formed over the entire circumference between the inner circumference of the cylinder body 26 and the outer circumference of the extension piece 28. Due to the presence of the gap portion 29, the extension piece 28 is elastically deformable in the radial direction of the cylinder body 26.

[0030] A first sealing surface 33 is formed over the entire circumference at the tip of the pouring cylinder 13. The axis 32 passing through the center of the pouring cylinder 13 is eccentric to the axis 7 of the cap 1 on the side far from the hinge 15.

[0031] At the root end portion 13a of the pouring cylinder 13 (i.e., the root end portion of the cylinder body 26), a plurality of protruding pieces 50 protruding inward in the radial direction of the pouring cylinder 13 are provided. As shown in FIG. 3, the protruding pieces 50 are formed in a fan shape in a bottom view and are provided at a plurality of locations in the circumferential direction of the pouring cylinder 13. A gap 54 is formed between adjacent protruding pieces 50 in the circumferential direction of the pouring cylinder 13.

[0032] As shown in FIGS. 4 and 5, the protruding piece 50 has a straight extension portion 51 (straight portion) that extends straight downward from the root end portion 13a of the pouring cylinder 13 in the direction opposite to the pouring outlet 37 (i.e., downward), and an inclined portion 52 that is inclined in the direction opposite to the pouring outlet 37. The inclined portion 52 is provided at the lower end of the straight extension portion 51 and is inclined at an inclination angle A of, for example, 60° with respect to the horizontal plane 53. Note that the inclination angle A is not limited to 60°, and may be an angle other than 60°, such as 45°. Further, the horizontal plane 53 is an example of a plane orthogonal to the axis 32 of the pouring cylinder 13.

[0033] The root end portion 50a of the protruding piece 50 (i.e., the root end portion of the straight extension portion 51) is connected to the root end portion 13a of the pouring cylinder 13 on the outside of the pouring cylinder 13. As a result, the protruding piece 50 extends downward from the root end portion 13a of the pouring cylinder 13 to below the communication port 38 on the outside of the pouring cylinder 13 without entering the inside of the pouring cylinder 13. A flow passage 55 that passes between the protruding pieces 50 and leads from the communication port 38 to the pouring port 37 is formed in the pouring cylinder 13.

[0034] In the closed state shown in FIG. 4, the lid 14 has a circular top plate portion 41, a cylindrical skirt portion 42 that hangs down from the outer peripheral edge of the top plate portion 41, a cylindrical intermediate cylinder 43, a cylindrical sealing cylinder 44 (an example of a sealing projection), an annular projection portion 45, and a second sealing surface 46. The intermediate cylinder 43, the sealing cylinder 44, and the projection portion 45 are each provided inside the lid 14 and project downward from the top plate portion 41.

[0035] As shown in FIG. 1, an inwardly protruding convex portion 47 is formed over the entire circumference on the inner periphery of the opening edge of the skirt portion 42 in the radial direction 8. As shown in FIG. 4, the intermediate cylinder 43 is provided on the top plate portion 41 and is arranged concentrically about the axis 7 of the cap 1 in the closed state where the cap 1 is closed. Further, the convex portion 47 of the skirt portion 42 of the closed lid 14 fits into the concave portion 24 of the protruding piece 23 of the cap body 11, and the tip of the intermediate cylinder 43 of the lid 14 abuts against the upper surface of the partition wall 20 of the cap body 11.

[0036] The sealing cylinder 44 and the projection portion 45 are each provided on the top plate portion 41 and are arranged concentrically about the axis 32 of the pouring cylinder 13. The projection portion 45 is formed over the entire circumference around the outer periphery of the root end portion of the sealing cylinder 44. The second sealing surface 46 constitutes a part of the inner surface (back surface) of the top plate portion 41 and is formed between the sealing cylinder 44 and the projection portion 45.

[0037] Also, in the closed state, the sealing cylinder 44 of the closed lid 14 is inserted into the inside of the pouring cylinder 13 from the pouring outlet 37, the outer periphery of the sealing cylinder 44 is in close contact with the inner periphery of the extending piece 28, the tip of the pouring cylinder 13 is sandwiched between the sealing cylinder 44 and the protruding portion 45, and the second sealing surface 46 is in close contact with the first sealing surface 33 over the entire circumference. Next, the operation of the above configuration will be described.

[0038] As shown in FIG. 1, when the cap 1 is opened to the open state and the container 2 is tilted, the fluid in the container 2 is poured out from the pouring outlet 37 through the inside of the pouring cylinder 13 from the communication port 38. At this time, since the protruding piece 50 serves as a resistance to the flow of the fluid and suppresses the momentum of the fluid, it is possible to prevent the fluid from jumping out vigorously from the pouring outlet 3.

[0039] Also, as shown in FIG. 4, in the closed state, the second sealing surface 46 of the lid 14 is in close contact with the first sealing surface 33 of the pouring cylinder 13, and the outer periphery of the sealing cylinder 44 of the lid 14 is in close contact with the inner periphery of the extending piece 28 of the pouring cylinder 13. Therefore, the tip of the pouring cylinder 13 and the lid 14 are sealed in a closed state.

[0040] In addition, since a gap 29 is formed between the inner periphery of the cylinder body 26 and the outer periphery of the extending piece 28, the extending piece 28 is easily deformed outward in the radial direction of the pouring cylinder 13. Therefore, as shown in FIG. 4, when closing and sealing the lid 14, the force required to insert the sealing cylinder 44 from the pouring outlet 37 into the inside of the pouring cylinder 13 (hereinafter referred to as the closing force) is reduced.

[0041] Also, as shown in FIG. 1, when opening and unsealing the lid 14, the extending piece 28 is easily deformed outward in the radial direction of the pouring cylinder 13, so that the frictional resistance between the pouring cylinder 13 and the sealing cylinder 44 is reduced, and the force required to remove the sealing cylinder 44 from the pouring outlet 37 to the outside of the pouring cylinder 13 is reduced. As a result, the lid 14 can be opened and closed lightly and smoothly to perform unsealing and sealing. Next, a manufacturing method for manufacturing the cap 1 by injection molding will be described.

[0042] As shown in Fig. 6, 71 is a mold used for injection molding the cap 1 in the open state shown in Fig. 1. The mold 71 has a lower mold 72 that forms the lower side of the cap body 11 and the outside of the lid 14 (not shown), and an upper mold 73 that forms the upper side of the cap body 11 and the inside of the lid 14 (not shown).

[0043] The lower mold 72 has a first core 75 (an example of a predetermined core) that forms the inner peripheral surface of the cylinder body 26 of the pouring cylinder 13 and the inner surface of the protruding piece 50, a second core 76 that forms the inner peripheral surface of the inner cylinder 19, the lower surface of the partition wall 20, and the outer surface of the protruding piece 50, and a third core 77 that forms the mounting groove 21 and the like. The first core 75 is disposed so as to penetrate the second core 76. The third core 77 is disposed around the second core 76.

[0044] The upper mold 73 has a fourth core 79 that forms the inner peripheral surface of the extension piece 28 of the pouring cylinder 13, and a fifth core 80 that forms the outer peripheral surface of the pouring cylinder 13 and the upper surface of the partition wall 20. The fourth core 79 is disposed so as to penetrate the fifth core 80.

[0045] 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 D as shown in Fig. 6, a cooling step of cooling and solidifying the filled synthetic resin material D, and a demolding step of demolding the synthetic resin material D cooled and solidified in the mold 71 from the mold 71.

[0046] According to this, first, the filling step is performed, then the cooling step is performed, and then the demolding step is performed. In the demolding step, first, as shown in Fig. 7, the second core 76 is moved downward in the B direction (an example of the detachment direction facing from the pouring port 37 of the pouring cylinder 13 to the communication port 38) for demolding. Thereby, a space 82 is formed below the partition wall 20 and the protruding piece 50.

[0047] Next, as shown in FIG. 8, the first core 75 is moved downward in the B direction to be released. At this time, while the first core 75 moves downward in the B direction inside the casting cylinder 13, it presses the protruding piece 50. However, since the protruding piece 50 is connected to the root end portion 13a of the casting cylinder 13 on the outside of the casting cylinder 13, it is difficult for the first core 75 to be caught by the root end portion 50a of the protruding piece 50, and the first core 75 smoothly moves downward in the B direction while slidingly contacting the protruding piece 50, reducing the release resistance of the first core 75.

[0048] As a result, the force acting on the root end portion 50a of the protruding piece 50 from the first core 75 is reduced, and it is possible to prevent deformation from remaining in the protruding piece 50 after release, and to prevent the actual inclination angle A of the protruding piece 50 after release from deviating significantly from the inclination angle assumed in the design.

[0049] Thereafter, the fourth core 79 is moved upward in the C direction (the direction from the communication port 38 of the casting cylinder 13 toward the casting port 37) to be released, and further, the fifth core 80 is moved upward in the C direction to be released. By thus releasing the synthetic resin material D cooled and solidified in the mold 71 from the mold 71, the synthetic resin cap 1 shown in FIG. 1 is manufactured. (Comparative Example) A comparative example with respect to the first embodiment will be described below.

[0050] In the comparative example, as shown in FIG. 9, the root end portion 50a of the protruding piece 50 is connected to the inner peripheral surface 13b at the lower part of the casting cylinder 13 instead of the root end portion 13a of the casting cylinder 13. As a result, the root end portion 50a of the protruding piece 50 enters inside the casting cylinder 13.

[0051] In such a comparative example, in the mold release process, after moving the second core 76 downward in the B direction to release the mold, as shown in FIG. 10, when moving the first core 75 downward in the B direction to release the mold, the protruding piece 50 is pressed against the first core 75, and the inclination angle A of the protruding piece 50 temporarily expands to a steeper angle than the inclination angle assumed in the design. However, since the root end portion 50a of the protruding piece 50 is connected to the inner peripheral surface 13b at the lower part of the pouring cylinder 13 (see FIG. 9), the first core 75 gets caught on the root end portion 50a of the protruding piece 50, and the mold release resistance of the first core 75 increases.

[0052] As a result, an excessive force acts on the root end portion 50a of the protruding piece 50 from the first core 75. Even after the first core 75 moves away below the protruding piece 50 after mold release, deformation remains in the protruding piece 50, and the actual inclination angle A of the protruding piece 50 after mold release does not return to the inclination angle assumed in the design, but remains expanded to a steeper angle than the design inclination angle.

[0053] Also, as shown in FIG. 10, when moving the first core 75 downward in the B direction to release the mold, if the first core 75 gets caught on the root end portion 50a of the protruding piece 50 and the mold release resistance of the first core 75 increases, there is also a risk that the pouring cylinder 13 and the partition wall 20 will be pulled downward in the B direction by the first core 75 and deformed. (Second Embodiment)

[0054] In the first embodiment described above, as shown in FIGS. 4 and 5, the protruding piece 50 has a straight extension portion 51 and an inclined portion 52. However, in the second embodiment described below, as shown in FIGS. 11 and 12, the protruding piece 50 has no straight extension portion 51 and has only the inclined portion 52. In this case, the root end portion 50a of the protruding piece 50 (that is, the root end portion of the inclined portion 52) is connected to the root end portion 13a of the pouring cylinder 13 outside the pouring cylinder 13. That is, the protruding piece 50 extends downward from the root end portion 13a of the pouring cylinder 13 to below the communication port 38 outside the pouring cylinder 13 without entering the inside of the pouring cylinder 13.

[0055] According to this, in the second embodiment, the same operations and effects as those of the above-described first embodiment can be obtained. However, the protruding piece 50 having the straight extension portion 51 shown in the first embodiment (see FIG. 5) can further reduce the release resistance of the first core 75 compared to the protruding piece 50 without the straight extension portion 51 (see FIG. 12).

[0056] In the above-described first embodiment, as shown in FIG. 5, the protruding piece 50 has a straight extension portion 51 and an inclined portion 52 inclined at a predetermined inclination angle A from the lower end of the straight extension portion 51. However, instead of the inclined portion 52, it may have a bent portion bent at a right angle from the lower end of the straight extension portion 51. In this case, the inclination angle A of the bent portion is 0°.

[0057] In the above-described second embodiment, as shown in FIG. 12, the protruding piece 50 is inclined at a predetermined inclination angle A, but it may be a protruding piece 50 that is not inclined (i.e., the inclination angle A = 0°).

[0058] In each of the above embodiments, as shown in FIG. 6, when manufacturing the cap 1 by injection molding, the injection port 37 of the injection cylinder 13 is directed upward and the communication port 38 is directed downward, but the up and down may be reversed. In this case, the mold 71 may also be arranged with the up and down reversed. In each of the above embodiments, as shown in FIG. 3, eight protruding pieces 50 are provided, but a plurality of pieces other than eight may be provided.

[0059] In each of the above embodiments, as shown in FIGS. 1 and 11, as an example of the sealing protrusion, a cylindrical sealing cylinder 44 is provided, but it is not limited to such a cylinder, and for example, a columnar protrusion may be used.

[0060] In each of the above embodiments, as shown in FIGS. 1 and 11, a hinged cap 1 in which the lid 14 is connected to the cap body 11 via a hinge 15 is illustrated. However, instead of the hinge 15, a screw-type cap in which either a male screw or a female screw is formed on the cap body 11 and the other screw is formed on the lid 14 may be used.

Explanation of Reference Numerals

[0061] 1 Cap 2 Container 11 Cap body 13 Pouring tube 13a Root end part 14 Lid 26 Tube body 28 Extending piece 29 Gap part 37 Pouring outlet 38 Communication port 44 Sealing tube (sealing protrusion) 50 Protruding piece 51 Straight extension part 52 Inclined part 55 Flow path 71 Mold 75 First core (predetermined core) B Downward (removal direction) D Synthetic resin material

Claims

1. 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, wherein the pouring cylinder is provided on the cap body, has a pouring port at its tip, and has a communication port communicating with the inside of the container at the root end portion opposite to the tip portion, a plurality of protruding pieces protruding inward in the radial direction of the pouring cylinder are provided at the root end portion of the pouring cylinder, the protruding pieces are connected to the root end portion of the pouring cylinder outside the pouring cylinder, a flow passage passing between the protruding pieces and reaching the pouring port from the communication port is formed inside the pouring cylinder. The cap is characterized by this.

2. The cap according to claim 1, wherein the protruding piece has an inclined portion inclined in a direction opposite to the pouring port.

3. The protruding piece has a straight extension portion extending from the root end portion of the pouring cylinder in a direction opposite to the pouring port, The cap according to claim 2, wherein the inclined portion is provided at the end of the straight extension portion.

4. A sealing protrusion is provided inside the lid, the pouring cylinder has a cylinder body provided on the cap body and an annular extension piece extending radially inward from the tip of the cylinder body and in the direction of the root end portion of the pouring cylinder, a gap portion is formed between the inner circumference of the cylinder body and the outer circumference of the extension piece, In the closed state, the sealing protrusion of the closed lid is inserted into the inside of the pouring cylinder from the pouring port, and the outer circumference of the sealing protrusion is in close contact with the inner circumference of the extension piece. The cap according to claim 1 is characterized by this.

5. A manufacturing method for manufacturing the cap according to claim 1 by injection molding, wherein in a mold release step of releasing a synthetic resin material solidified in a mold from the mold, a predetermined core forming the inside of the pouring cylinder is released in a release direction facing from the pouring port of the pouring cylinder to the communication port. The manufacturing method of the cap is characterized by this.

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