Cap and method for manufacturing the cap

Abstract

To provide a cap that allows for the easy and reliable formation of a through-hole in the bottom wall of a dispensing cylinder. [Solution] A cap 10 having a cap body 11 that is attached to a container and a dispensing tube 12 provided on the cap body 11, wherein the bottom of the dispensing tube 12 is closed by a bottom wall 33, and the bottom wall 33 is provided with a projection 35 and a penetration portion 36, the projection 35 protruding from the bottom wall 33 in the opening direction 20 of the mold, and the penetration portion 36 is breakable by the tensile force applied to the projection 35 from the mold that moves in the opening direction 20 during cap manufacturing, and when the penetration portion 36 breaks, a penetration portion that penetrates the bottom wall 33 in the thickness direction of the bottom wall 33 is formed.

Description

Technical Field

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

Background Art

[0002] Conventionally, as this type of cap, for example, as described in Patent Document 1 below, there is one having an attachment portion (cap body) attached to the mouth portion of a container and a cylindrical portion (dispensing cylinder) for dispensing the contents of the container to the outside. The cylindrical portion is provided on the top wall portion of the attachment portion. A valve portion is provided at the bottom inside the cylindrical portion. The valve portion has a wall portion arranged to block the hollow portion inside the cylindrical portion and a slit penetrating the wall portion.

[0003] According to this, by tilting and squeezing the container, the contents inside the container flow into the cylindrical portion through the slit of the valve portion and are dispensed to the outside from the tip of the cylindrical portion.

[0004] Also, Patent Document 2 below discloses a chemical solution container in which a nozzle for a chemical solution container is attached to the mouth portion of the chemical solution container. The nozzle for the chemical solution container has a through hole in the central portion. A minute hole having a smaller diameter than the through hole is formed at the lower end portion of the through hole. According to this, the chemical solution inside the chemical solution container passes through the minute hole of the nozzle for the chemical solution container, flows through the through hole, and is dropped from the tip of the nozzle for the chemical solution container.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the conventional type described in Patent Document 1, a slit is formed in the valve by cutting into the valve using a cutter, which presents a problem as it is time-consuming.

[0007] Furthermore, in the case described in Patent Document 2 above, when a nozzle for a liquid medicine container is manufactured by injection molding, for example, the position of the joint between the molds may be slightly misaligned, causing the minute holes in the nozzle for the liquid medicine container to be blocked by burrs. When such a defect occurs, it is necessary to pierce the burr with a needle to create a tiny hole, which is time-consuming and problematic. The present invention aims to provide a cap and a method for manufacturing the cap that can reliably and easily form a through-hole in the bottom wall of a dispensing cylinder. [Means for solving the problem]

[0008] To achieve the above objective, the present invention provides a cap having a cap body that is attached to a container and a dispensing cylinder for dispensing the contents of the container to the outside, The dispensing tube is located on the cap body. The bottom of the dispensing cylinder is sealed by the bottom wall. A projection and a planned penetration section are provided on the bottom wall. The projection protrudes from the bottom wall in the direction of the mold opening. The portion intended for penetration can be broken by the tensile force applied to the projection from the mold moving in the opening direction during cap manufacturing. The characteristic feature is that, when the intended penetration section breaks, a penetration section is formed in the bottom wall that penetrates in the thickness direction of the bottom wall.

[0009] According to this method, during the cap manufacturing process, when the mold moves in the opening direction, the projection is pulled in the opening direction by the mold. The tensile force applied to the projection at this time stretches and breaks the intended penetration point in the opening direction, forming the penetration point on the bottom wall of the dispensing cylinder. This eliminates the need for a processing step to form the penetration point on the bottom wall of the dispensing cylinder using a sharp cutting tool such as a cutter, and allows for the formation of the penetration point on the bottom wall of the dispensing cylinder easily and reliably.

[0010] The present invention relates to a cap having a cap body that is attached to a container and a dispensing cylinder for dispensing the contents of the container to the outside, The dispensing tube is located on the cap body. A bottom wall is formed at the bottom of the dispensing cylinder. The bottom wall is provided with a projection and a through-hole that penetrates in the thickness direction of the bottom wall. The projection protrudes from the bottom wall in the direction of the mold opening. The bottom wall is characterized by being deformable in the opening direction at the base of the projection due to the tensile force applied to the projection from the mold that moves in the opening direction during cap manufacturing.

[0011] According to this, during the cap manufacturing process, when the mold moves in the opening direction, the projection is pulled in the opening direction by the mold, and a tensile force is applied from the mold to the projection. This tensile force causes the bottom wall to deform in the opening direction at the base of the projection.

[0012] As a result, even if the penetration in the bottom wall of the dispensing cylinder is blocked by a burr, the bottom wall deforms in the opening direction at the base of the projection as described above, causing the burr to be stretched and broken in the opening direction. Therefore, the processing step of piercing the burr with a sharp instrument such as a needle to form a penetration in the bottom wall of the dispensing cylinder can be eliminated, and a penetration can be formed in the bottom wall of the dispensing cylinder easily and reliably.

[0013] According to the cap of the present invention, it is preferable that the projection is inclined radially with respect to the axis of the cap body.

[0014] According to this, in the manufacturing process of the cap, when the mold moves in the opening direction, the protruding piece is surely pulled in the opening direction by the mold. In this way, when the protruding piece is pulled in the opening direction by the mold to a certain extent, the protruding piece detaches from the mold, and only the mold moves in the opening direction.

[0015] According to the cap of the present invention, it is preferable that the planned penetration part has a thin-wall structure thinner than the wall thickness of the bottom wall.

[0016] According to this, in the manufacturing process of the cap, the planned penetration part is surely broken by the tensile force applied to the protruding piece.

[0017] According to the cap of the present invention, it is preferable that the planned penetration part is arranged at the attachment root of the protruding piece.

[0018] According to this, in the manufacturing process of the cap, since the tensile force applied to the protruding piece concentrates on the attachment root of the protruding piece, the planned penetration part is surely broken by the tensile force applied to the protruding piece.

[0019] According to the cap of the present invention, the pouring cylinder is eccentric in one direction with respect to the cap body, the protruding piece is inclined in one direction with respect to the axis of the cap body, it is preferable that the planned penetration part is arranged on one direction side at the attachment root of the protruding piece.

[0020] According to this, when the container is tilted in one direction, the content in the container flows in one direction with respect to the protruding piece. On the other hand, since the planned penetration part is arranged on one direction side at the attachment root of the protruding piece and the protruding piece is inclined in one direction, the protruding piece functions as a baffle plate against the one-direction flow of the content.

[0021] Thereby, the one-direction flow of the content in the container is blocked by the protruding piece, and it becomes difficult for the content to flow into the penetration part of the bottom wall of the pouring cylinder from the inside of the container. Even if the container is inadvertently tilted in one direction, it is possible to suppress the content from dripping outside from the tip opening of the pouring cylinder.

[0022] According to the cap of the present invention, it is preferable that the through portion is located at the base of the projection.

[0023] According to this, during the cap manufacturing process, the tensile force applied to the projection is concentrated at the base of the projection, so the bottom wall deforms reliably in the opening direction at the base of the projection. This ensures that the burrs at the penetration point are reliably broken.

[0024] According to the cap of the present invention, the dispensing cylinder is eccentric in one direction with respect to the cap body. The projection is inclined in one direction with respect to the axis of the cap body. It is preferable that the through portion is located on one side of the base of the projection.

[0025] According to this, when the container is tilted in one direction, the contents inside the container flow in one direction relative to the protrusion. However, since the penetrating portion is positioned on the one-direction side of the base of the protrusion, and the protrusion is inclined in one direction, the protrusion functions as a baffle against the unidirectional flow of the contents.

[0026] As a result, the unidirectional flow of the contents inside the container is obstructed by the protrusion, making it difficult for the contents to flow from inside the container into the penetration at the bottom wall of the dispensing cylinder. This also prevents the contents from dripping out of the tip opening of the dispensing cylinder even if the container is inadvertently tilted in one direction.

[0027] The present invention comprises a cap body that is attached to a container and a dispensing cylinder for dispensing the contents of the container to the outside. The dispensing tube is located on the cap body. The bottom of the dispensing cylinder is sealed by the bottom wall. A manufacturing method for producing a cap having a projection and a planned penetration portion on its bottom wall by injection molding, In the mold release process, which involves releasing a synthetic resin material that has solidified in the mold from the mold, The core forming the bottom wall and projection of the dispensing cylinder is moved in the opening direction of the mold, thereby applying tensile force from the core to the projection, pulling the projection in the opening direction of the mold, causing the intended penetration portion to break, and thereby forming a penetration portion in the bottom wall that penetrates in the thickness direction of the bottom wall.

[0028] According to this method, the process of forming a through-hole in the bottom wall of the dispensing cylinder using a cutter or other blade can be eliminated, and the through-hole can be formed in the bottom wall of the dispensing cylinder easily and reliably. [Effects of the Invention]

[0029] As described above, according to the present invention, a through-hole can be formed in the bottom wall of the dispensing cylinder without requiring much effort and reliably. [Brief explanation of the drawing]

[0030] [Figure 1] This is a cross-sectional view of the cap in the first embodiment of the present invention, showing the closed state. [Figure 2] This is a cross-sectional view of the cap, showing it in the open state. [Figure 3] This is a view from the direction of arrow XX in Figure 2. [Figure 4] This is a view along the YY arrow in Figure 2. [Figure 5] This is a cross-sectional perspective view of the main part of the cap. [Figure 6] This is a magnified cross-sectional view of the main part of the cap. [Figure 7] This is a cross-sectional view of a portion of the mold used for injection molding of the cap, showing the mold in a closed state. [Figure 8] This is a cross-sectional view of the mold showing the filling process when injection molding the cap. [Figure 9] This is a cross-sectional view of the mold used to explain the manufacturing method of the cap, showing the process of demolding the first core downwards. [Figure 10] This is a cross-sectional view of the mold used to explain the manufacturing method of the cap, showing the process of demolding the first core downwards. [Figure 11] This is a cross-sectional view of the mold used to explain the manufacturing method of the cap, showing the process of demolding the first core downwards. [Figure 12] This is a cross-sectional view of the mold used to explain the manufacturing method of the cap, showing the process of releasing the third core upwards from the mold. [Figure 13] This is a partially enlarged cross-sectional view of a container equipped with the same cap, showing the cap being opened and the container being tilted to dispense the contents from the dispensing tube. [Figure 14] This is an enlarged cross-sectional view of the main part of the cap in the second embodiment of the present invention. [Figure 15] This is a magnified cross-sectional view of a part of the mold showing the filling process when injection molding the cap. [Figure 16] This is a cross-sectional view of the mold used to explain the manufacturing method of the cap, showing the process of demolding the first core downwards. [Figure 17] This is a magnified cross-sectional view of a part of the mold showing the filling process when injection molding the cap, illustrating how burrs are blocking the through-hole. [Modes for carrying out the invention]

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

[0032] In the first embodiment, as shown in Figure 1, 1 is a container that holds a liquid contents 2 (an example of contents) such as soy sauce or other seasonings. A cap 10 made of synthetic resin is attached to the container 1. The container 1 is deformed by being squeezed and has the function of pouring the liquid contents 2 out from the cap 10.

[0033] As shown in Figures 2 to 4, the cap 10 includes a cap body 11 attached to the mouth 3 of the container 1, a dispensing tube 12 for dispensing the liquid contents 2 to the outside, and a lid 13 for opening and closing the dispensing tube 12. The lid 13 is connected to the cap body 11 via a hinge 14 so as to be rotatable in the opening and closing directions 15 and 16. Although the cap body 11 is directly attached to the mouth 3 of the container 1, it may also be attached indirectly to the mouth 3 via an inner stopper or the like.

[0034] As shown in Figure 2, the direction of the axis 18 passing through the center of the cap body 11 is defined as the vertical direction 19, 20, the direction perpendicular to the axis 18 is defined as the radial direction 21, and as shown in Figures 3 and 4, the circumferential direction centered on the axis 18 is defined as the circumferential direction 22.

[0035] The cap body 11 includes a disc-shaped top wall 23 that seals the tip opening of the mouth portion 3, a cylindrical outer cylinder 24 extending downward from the outer peripheral edge of the top wall 23, and a cylindrical inner cylinder 25 extending downward from the top wall 23 inside the outer cylinder 24.

[0036] A mounting groove 26 is formed around the entire circumference between the outer cylinder 24 and the inner cylinder 25, with the upper part closed by the top wall 23 and the lower part open. As shown in Figure 1, the cap 10 is attached to the container 1 by fitting the mouth 3 of the container 1 into the mounting groove 26 from below.

[0037] As shown in Figures 2, 3, 5, and 6, an annular first fitting portion 29 is provided on the upper surface of the top wall 23. The first fitting portion 29 has a recessed portion 30 that extends inward in the radial direction 21 along its entire circumference.

[0038] The dispensing cylinder 12 is a circular cylinder erected upward on the top wall 23. As shown in Figures 2 and 3, it is positioned radially 21 inward from the first fitting portion 29 and is eccentric in one direction 32 with respect to the axis 18 of the cap body 11. The one direction 32 is the direction opposite to the hinge 14 (i.e., the direction away from the hinge 14).

[0039] The bottom of the dispensing cylinder 12 is closed by a circular bottom wall 33. As shown in Figures 2, 3, 5, and 6, the bottom wall 33 is provided with a projection 35 and a planned penetration portion 36 having a thin-walled structure that is thinner than the wall thickness T of the bottom wall 33.

[0040] The projection 35 protrudes downward 20 (an example of the mold opening direction) from the lower surface of the bottom wall 33 and is inclined in one direction 32 with respect to the axis 18 of the cap body 11. As a result, as shown in Figure 6, the lower tip portion 35a of the projection 35 is offset in one direction 32 relative to the base portion 35b attached to the bottom wall 33.

[0041] As shown in Figures 3 and 6, the planned penetration portion 36 has an arc-shaped groove 36a that is open at the top and bulges in one direction 32 in a plan view, and is located on the side of the base portion 35b of the projection 35 in the direction 32.

[0042] As shown in Figures 9 and 10, the planned penetration portion 36 can be fractured by the tensile force F applied to the projection 35 from the first core 65 (an example of a mold) which moves downward 20 during cap manufacturing. When the planned penetration portion 36 fractures, a minute slit-shaped penetration portion 38 is formed in the bottom wall 33 that penetrates in the vertical directions 19, 20 (an example of the thickness direction of the bottom wall 33).

[0043] As shown in Figures 2 to 4, the lid 13 has a circular lid plate 45, a cylindrical skirt 46 provided on the outer edge of the lid plate 45, and a cylindrical insertion member 47 provided inside the skirt 46. As shown in Figure 2, a second fitting portion 49 that protrudes inward in the radial direction 21 is formed around the entire circumference of the inner circumference of the skirt 46.

[0044] As shown in Figure 1, when the cap 10 is closed, the second fitting portion 49 of the lid 13 fits into the recessed portion 30 of the first fitting portion 29 of the cap body 11, so that the lid 13 does not open unintentionally due to vibration or the like.

[0045] As shown in Figure 2, the insertion member 47 is eccentric, similar to the dispensing cylinder 12. As shown in Figure 1, when the cap is closed, the insertion member 47 is inserted into the dispensing cylinder 12 through the spout 39 formed at the tip of the dispensing cylinder 12 and makes close contact with the inner surface of the dispensing cylinder 12 around its entire circumference. This seals the space between the dispensing cylinder 12 and the lid 13. The cap 10 described above is manufactured by injection molding. Next, the manufacturing method of the cap 10 will be explained.

[0046] As shown in Figure 7, 61 is a mold used when injection molding the cap 10 in the open state shown in Figure 2. The mold 61 has a lower mold 62 that forms the lower part of the cap body 11 and the outside of the lid 13, and an upper mold 63 that forms the upper part of the cap body 11 and the inside of the lid 13.

[0047] The lower mold 62 has a first core 65 that forms the lower surface of the bottom wall 33 of the dispensing cylinder 12, the projection 35, the lower surface of the top wall 23, and the inside of the inner cylinder 25, a second core 66 that forms the mounting groove 26, and several other cores (e.g., cores 83, 84, etc.). Furthermore, a groove-shaped recess 67 is formed at the upper end of the first core 65, sloping diagonally downward from the upper end surface. The recess 67 is for forming the projection 35.

[0048] The upper mold 63 has a third core 69 that forms the inside of the dispensing cylinder 12, the upper surface of the bottom wall 33, the planned penetration portion 36, and the groove 36a, etc., a fourth core 70 that forms the outside of the dispensing cylinder 12 and the upper surface of the top wall 23, and several other cores (e.g., cores 85, 86, etc.). Furthermore, the lower end surface of the third core 69 is provided with a protrusion 71 that forms the planned through-hole 36 and the groove 36a. These first to fourth cores, 65, 66, 69, and 70, are movable vertically by 19 and 20 degrees, respectively.

[0049] The method for manufacturing the cap 10 includes a filling step of filling the molded product space 72 inside the closed mold 61 with molten synthetic resin material 73 (see Figure 8), a cooling step of cooling and solidifying the filled synthetic resin material 73, and a release step of releasing the synthetic resin material 73 that has cooled and solidified inside the mold 61 from the mold 61. According to this, first, as shown in Figure 8, the mold 61 is closed and the filling process is performed, then the cooling process is performed, and then the demolding process is performed.

[0050] In the demolding process, first, as shown in Figure 9, the first core 65 is moved downward 20 (an example of the mold opening direction) to demold it. This forms the lower surface of the bottom wall 33 of the dispensing cylinder 12, the projection 35, the lower surface of the top wall 23, and the inside of the inner cylinder 25, etc.

[0051] At this time, the projection 35 is pulled downward 20 by the first core 65 of the lower mold 62, and the tensile force F applied to the projection 35 causes the bottom wall 33 to be pulled downward 20 and deformed, as shown in Figure 10, the intended penetration portion 36 is stretched downward 20 and breaks, and a minute slit-shaped penetration portion 38 that penetrates in the vertical directions 19, 20 is formed in the bottom wall 33 of the dispensing cylinder 12.

[0052] Immediately afterward, the first core 65 continues to move downward 20, and when the amount of deformation of the bottom wall 33 downward 20 reaches a certain amount, as shown in Figure 11, the projection 35 detaches from the recess 67 of the first core 65. As a result, the tensile force F of the first core 65 is no longer applied to the projection 35, and the bottom wall 33, which had been deformed downward 20, returns to its original shape (or nearly original shape) by elasticity.

[0053] This eliminates the processing step of forming a through-hole in the bottom wall 33 of the dispensing cylinder 12 using a sharp blade such as a cutter, and allows for the formation of a minute slit-shaped through-hole 38 in the bottom wall 33 of the dispensing cylinder 12 easily and reliably.

[0054] Furthermore, as shown in Figure 6, since the intended penetration portion 36 is located on one side 32 of the base portion 35b of the projection 35, the tensile force F applied to the projection 35 is concentrated at the base portion 35b of the projection 35, as shown in Figures 9 and 10. As a result, the intended penetration portion 36 is reliably fractured by the tensile force F applied to the projection 35.

[0055] Subsequently, the second core 66 (see Figure 8) is moved downward 20 to release it from the mold, thereby forming the mounting groove 26 (see Figure 2). Furthermore, the other cores 83, 84, etc. are sequentially released from the mold.

[0056] Subsequently, as shown in Figure 12, the third core 69 is moved upward 19 and released, thereby forming the inside of the dispensing cylinder 12 and the upper surface of the bottom wall 33. Furthermore, the fourth core 70 is moved upward 19 and released, thereby forming the outside of the dispensing cylinder 12 and the upper surface of the top wall 23. After that, the other cores 85, 86, etc. are released sequentially.

[0057] After manufacturing the cap 10 by injection molding as described above, the cap 10 is pressed into the container 1 with the lid 13 closed (sealed) as shown in Figure 1. This causes the opening 3 of the container 1 to fit into the mounting groove 26 (see Figure 2) from below, and the cap 10 is attached to the container 1.

[0058] Subsequently, as shown in Figure 13, by opening the lid 13 (unplugging), the insertion member 47 is detached from the spout 39 to the outside of the dispensing cylinder 12. Then, by tilting and squeezing the container 1, the liquid pressure of the contents 2 inside the container 1 increases, and the contents 2 inside the container 1 flow into the inside of the dispensing cylinder 12 through the penetration 38 in the bottom wall 33 of the dispensing cylinder 12, and are dispensed to the outside from the spout 39.

[0059] In this process, the amount of liquid content 2 dispensed from the dispensing cylinder 12 can be adjusted by changing the amount of compression (squeeze) of container 1. For example, it is possible to dispense the liquid content 2 drop by drop from the dispensing cylinder 12.

[0060] Furthermore, when the container 1 is tilted in the open state, unless the container 1 is squeezed, the contents 2 will have difficulty passing through the penetration 38 in the bottom wall 33 of the dispensing cylinder 12, thus preventing the contents 2 from dripping out of the spout 39 of the dispensing cylinder 12.

[0061] In particular, when the container 1 is tilted in the open state so that the hinge 14 is at the top and the dispensing tube 12 is at the bottom (or when the container 1 is accidentally tipped over so that the hinge 14 is at the top and the dispensing tube 12 is at the bottom), the liquid contents 2 inside the container 1 flow in one direction 32 relative to the projection 35. In contrast, since the through-hole 38 is positioned on the side of the base 35b of the projection 35 that is in the one direction 32, and the projection 35 is inclined in the one direction 32, the projection 35 functions as a baffle plate against the flow of the liquid contents 2 in the one direction 32.

[0062] As a result, the flow of the liquid contents 2 in one direction 32 is obstructed by the protrusion 35, making it difficult for the liquid contents 2 to flow from inside the container 1 into the penetration 38 of the bottom wall 33 of the dispensing cylinder 12. This further suppresses the leakage of the liquid contents 2 from the spout 39 of the dispensing cylinder 12 to the outside, even if the container 1 is tilted unintentionally (or accidentally tipped over). (Second Embodiment)

[0063] In the first embodiment described above, when the cap 10 is manufactured by injection molding, a breakable penetration portion 36 is formed in the bottom wall 33 of the dispensing cylinder 12, as shown in Figure 6. However, in the second embodiment described below, as shown in Figure 14, when the cap 10 is manufactured by injection molding, the penetration portion 36 is not formed in the bottom wall 33 of the dispensing cylinder 12, and instead a penetration opening 78 (an example of a penetration portion) is formed. Furthermore, for components that are the same as those shown in the first embodiment described above, the same reference numerals are used, and detailed descriptions are omitted.

[0064] The bottom wall 33 of the dispensing cylinder 12 has an arc-shaped groove 36a that is open at the top and bulges in one direction 32 when viewed from above. The through-hole 78 is a minute slit-shaped opening that penetrates in the vertical direction 19, 20 (an example of the thickness direction of the bottom wall 33), is formed on the side of the base portion 35b of the projection 35 in one direction 32, and communicates with the lower part of the groove 36a.

[0065] As shown in Figure 16, the bottom wall 33 of the dispensing cylinder 12 is deformable downward 20 at the base 35b of the projection 35 due to the tensile force F applied to the projection 35 from the first core 65 (an example of a mold) which moves downward 20 during cap manufacturing. The cap 10 described above is manufactured by injection molding. Next, the manufacturing method of the cap 10 will be explained.

[0066] As shown in Figures 7 and 15, the lower mold 62 has a first core 65 that forms the lower surface of the bottom wall 33 of the dispensing cylinder 12, the projection 35, the lower surface of the top wall 23, and the inside of the inner cylinder 25, a second core 66 that forms the mounting groove 26, and several other cores (e.g., cores 83, 84, etc.).

[0067] The upper mold 63 has a third core 69 that forms the inside of the dispensing cylinder 12, the upper surface of the bottom wall 33, the groove 36a, and the through-hole 78, etc., a fourth core 70 that forms the outside of the dispensing cylinder 12 and the upper surface of the top wall 23, and several other cores (e.g., cores 85, 86, etc.). Furthermore, as shown in Figure 15, the lower end surface of the third core 69 is provided with a protrusion 71 that forms a groove 36a and a through-hole 78.

[0068] According to this, first, in the filling process, as shown in Figure 15, molten synthetic resin material 73 is filled into the molded product space 72 inside the closed mold 61, and then, in the cooling process, the synthetic resin material 73 is cooled and solidified.

[0069] Subsequently, in the demolding process, the first core 65 is first moved downward 20 (an example of the mold opening direction) to demold it. This forms the lower surface of the bottom wall 33 of the dispensing cylinder 12, the projection 35, the lower surface of the top wall 23, and the inside of the inner cylinder 25, etc.

[0070] In this process, as shown in Figure 16, the projection 35 is pulled downward 20 by the first core 65 of the lower mold 62, and the tensile force F applied to the projection 35 at this time causes the bottom wall 33 to be pulled downward 20 and deformed at the base 35b of the projection 35.

[0071] Subsequently, the first core 65 moves further downward 20, and when the amount of deformation of the bottom wall 33 downward 20 reaches a certain amount, the projection 35 detaches from the recess 67 of the first core 65. As a result, the tensile force F of the first core 65 is no longer applied to the projection 35, and the bottom wall 33, which had been deformed downward 20, returns to its original shape (or nearly original shape) by elasticity. Subsequently, the mounting groove 26 is formed by moving the second core 66 downward 20 and releasing it from the mold.

[0072] Subsequently, the third core 69 is moved upward 19 and released, thereby forming the inside of the dispensing cylinder 12, the upper surface of the bottom wall 33, the groove 36a, and the through-hole 78. Furthermore, the fourth core 70 is moved upward 19 and released, thereby forming the outside of the dispensing cylinder 12 and the upper surface of the top wall 23.

[0073] In the above filling process, when filling the molded product space 72 of the mold 61 with molten synthetic resin material 73, if the position of the joint between the upper end surface of the first core 65 and the lower end of the protrusion 71 of the third core 69 is slightly misaligned, the synthetic resin material 73 may leak out and solidify at the joint between the first core 65 and the third core 69 where the through-hole 78 should be formed, and as shown in Figure 17, the through-hole 78 may not open but be blocked by a burr 81 made of thin synthetic resin material 73.

[0074] Even if the through-hole 78 is blocked by the burr 81 in this way, during the demolding process, as shown in Figure 16, the bottom wall 33 is pulled downward 20 and deformed at the base 35b of the projection 35 by the tensile force F applied to the projection 35, so that the burr 81 is stretched downward 20 and broken.

[0075] Therefore, the processing step of piercing the burr 81 with a sharp tool such as a needle to form a through-hole 78 in the bottom wall 33 of the dispensing cylinder 12 can be eliminated, and as shown in Figure 14, the through-hole 78 can be formed in the bottom wall 33 easily and reliably.

[0076] Furthermore, since the through-hole 78 is located on one side 32 of the base 35b of the projection 35, the tensile force F applied to the projection 35 is concentrated at the base 35b of the projection 35. As a result, the bottom wall 33 is reliably deformed downward 20 at the base 35b of the projection 35, and the burr 81 of the through-hole 78 can be reliably broken.

[0077] After manufacturing the cap 10 by injection molding as described above, the cap 10 is attached to the container 1. Then, by opening the lid 13 and tilting the container 1 to squeeze it, the liquid pressure of the contents 2 inside the container 1 increases, and the contents 2 inside the container 1 flow into the inside of the dispensing cylinder 12 through the through-hole 78 in the bottom wall 33 of the dispensing cylinder 12, and are dispensed to the outside from the spout 39 as shown in Figure 13.

[0078] Furthermore, when the container 1 is tilted while open, unless the container 1 is squeezed, the contents 2 will have difficulty passing through the through-hole 78 in the bottom wall 33 of the dispensing cylinder 12, thus preventing the contents 2 from dripping out of the spout 39 of the dispensing cylinder 12.

[0079] In particular, when the container 1 is tilted in one direction 32 while open, the liquid contents 2 inside the container 1 flow in one direction 32 relative to the projection 35. In contrast, since the through-hole 78 is located on the side of the base 35b of the projection 35 that is in the direction 32, and the projection 35 is inclined in one direction 32, the projection 35 functions as a baffle plate against the flow of the liquid contents 2 in one direction 32.

[0080] As a result, the flow of the liquid contents 2 in one direction 32 is obstructed by the protruding piece 35, making it difficult for the liquid contents 2 to flow from inside the container 1 into the through-hole 78 in the bottom wall 33 of the dispensing cylinder 12. This further suppresses the leakage of the liquid contents 2 from the dispensing outlet 39 of the dispensing cylinder 12 to the outside, even if the container 1 is inadvertently tilted in one direction 32.

[0081] In each of the above embodiments, as shown in Figure 6, the projection 35 is inclined such that the lower tip portion 35a is offset in one direction 32 relative to the base portion 35b. However, the lower tip portion 35a may be inclined such that it is offset in the opposite direction to the one direction 32 relative to the base portion 35b. Alternatively, the projection 35 may be inclined such that the lower tip portion 35a is offset radially 21 relative to the base portion 35b.

[0082] In each of the above embodiments, as shown in Figure 6, the projection 35 is formed in the shape of an inclined flat plate. However, if the applied tensile force F exceeds the tensile force required to break the intended penetration portion 36 or the burr 81 (see Figure 17), the projection 35 may also be formed with an L-shaped cross-section, provided that it can be detached from the first core 65. [Explanation of Symbols]

[0083] 1 container 2 Contents liquid (contents) 10 caps 11 Cap body 12 Pour tube 18 axis 20 Downward direction (mold opening direction) 21 Radial direction 32 one direction 33 Bottom wall 35 Projection piece 35b Base of the projection 36 Planned penetration section 38 Penetration section 61 molds 65 The first core 73 Synthetic resin materials 78 Through-hole (penetration section) T Thickness of the bottom wall F Tensile force

Claims

1. A cap having a cap body that is attached to a container and a dispensing cylinder for dispensing the contents of the container to the outside, The dispensing tube is located on the cap body. The bottom of the dispensing cylinder is sealed by the bottom wall. A projection and a planned penetration section are provided on the bottom wall. The projection protrudes from the bottom wall in the direction of the mold opening. The portion intended for penetration can be broken by the tensile force applied to the projection from the mold moving in the opening direction during cap manufacturing. A cap characterized in that a penetration portion is formed in the bottom wall in the thickness direction of the bottom wall when the intended penetration portion breaks.

2. A cap having a cap body that is attached to a container and a dispensing cylinder for dispensing the contents of the container to the outside, The dispensing tube is located on the cap body. A bottom wall is formed at the bottom of the dispensing cylinder. The bottom wall is provided with a projection and a through-hole that penetrates in the thickness direction of the bottom wall. The projection protrudes from the bottom wall in the direction of the mold opening. A cap characterized in that the bottom wall can be deformed in the opening direction at the base of the projection by the tensile force applied to the projection from a mold that moves in the opening direction during cap manufacturing.

3. The cap according to claim 1 or 2, characterized in that the projection is inclined radially with respect to the axis of the cap body.

4. The cap according to claim 1, characterized in that the portion intended to penetrate has a thin-walled structure that is thinner than the thickness of the bottom wall.

5. The cap according to claim 1, characterized in that the portion intended to penetrate is located at the base of the projection.

6. The dispensing cylinder is offset in one direction relative to the cap body. The projection is inclined in one direction with respect to the axis of the cap body. The cap according to claim 1, characterized in that the portion intended to penetrate is located on one side of the base of the projection.

7. The cap according to claim 2, characterized in that the through portion is located at the base of the projection.

8. The dispensing cylinder is offset in one direction relative to the cap body. The projection is inclined in one direction with respect to the axis of the cap body. The cap according to claim 2, characterized in that the through portion is located on one side of the base of the projection.

9. It has a cap body that is attached to the container and a dispensing cylinder for dispensing the contents of the container to the outside. The dispensing tube is located on the cap body. The bottom of the dispensing cylinder is sealed by the bottom wall. A manufacturing method for producing a cap having a projection and a planned penetration portion on its bottom wall by injection molding, In the mold release process, which involves releasing a synthetic resin material that has solidified in the mold from the mold, A method for manufacturing a cap, characterized in that a core forming the bottom wall and projection of the dispensing cylinder is moved in the opening direction of the mold, thereby applying tensile force from the core to the projection, pulling the projection in the opening direction of the mold, causing the intended penetration portion to break, and thereby forming a penetration portion in the bottom wall that penetrates in the thickness direction of the bottom wall.

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