Cap

Abstract

To provide a cap in which a slit valve can be easily attached to a cap body and an attached state of the slit valve can also be easily checked.SOLUTION: A cap 1 is attached to a mouth 5 of a squeeze container 3 and includes a cap body 11, a slit valve 13, and a lid body 15. The cap body 11 and the slit valve 13 are configured as separate bodies. When assembling the slit valve 13 to the cap body 11, a fitting cylindrical portion 59 of the slit valve 13 is fitted from above a space 43 formed between an outer cylindrical portion 37 and an inner cylindrical portion 41 of the cap body 11 without any circumferential restriction, so there are no obstacles when fitting, and an alignment of the fitting cylindrical portion 59 of the slit valve 13 with the space 43 is easy to see, making installation work easy.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a cap attached to a container containing contents. [Background technology]

[0002] It is known that a cap fitted to the mouth of a squeeze container containing contents is provided with a slit valve. For example, Patent Document 1 discloses a slit valve cap in which a slit valve is attached from above to a cap fitted to the mouth of a container body, and the container body is pressed (squeezed) to dispense the viscous contents through the slit valve. Also, Patent Document 2 discloses a cap with a slit valve in which a valve is attached from the inside below the cap body fitted to the mouth of the container body, and the container body is squeezed to dispense the contents inside the container body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6452493 [Patent Document 2] Japanese Patent Publication No. 2023-026812 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the slit valve cap described in Patent Document 1, when assembling the slit valve to the cap from above, the slit valve is positioned so that the locking protrusion of the slit valve fits into the upper recess of the cap, and then the slit valve is assembled to the cap by pushing it in. In this assembly, it is necessary to align the locking protrusion of the slit valve with the upper recess of the cap, which causes a problem that the installation work is time-consuming.

[0005] In the cap with a slit valve described in Patent Document 2, the valve is attached from the inside below the cap body, so it needs to be pressed into a recessed position in the cap, which makes it difficult to confirm whether the valve is properly (securely) attached to the cap body.

[0006] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a cap that allows a slit valve to be easily attached to the cap body and also makes it easy to check the attachment status of the slit valve. [Means for solving the problem]

[0007] As a means for solving the above problem, the invention described in claim 1 is a cap to be attached to the mouth of a container that stores contents, the cap body including: a mouth-closing wall that is attached to the mouth and closes the mouth; an outer tubular portion that has a discharge passage that penetrates the mouth-closing wall and protrudes upward integrally from the mouth-closing wall; an inner tubular portion that is provided concentrically inside the outer tubular portion; and a tubular support portion that extends radially inward from the lower inner circumferential surface of the outer tubular portion and has an annular connecting portion that connects the outer tubular portion and the inner tubular portion; The container is provided with an elastic valve body having a fitting cylindrical portion that is pressed into the space formed between the outer cylindrical portion and the inner cylindrical portion from above, and a valve portion with a slit that opens when the container is pressurized, wherein the inner cylindrical portion extends upward from the inner peripheral edge of the annular connecting portion to a position approximately equal to the tip of the outer cylindrical portion, and at least one of the inner peripheral surface of the outer cylindrical portion of the cylindrical support portion or the outer peripheral surface of the inner cylindrical portion has a plurality of protrusions that bite into the valve body at predetermined intervals around the circumferential direction of the cylindrical support portion. In the cap according to this aspect, the elastic valve is press-fitted (settled) from above into the space formed between the outer and inner tubular portions of the cap body without any circumferential restriction, resulting in no obstructions during press-fitting. Furthermore, the alignment of the elastic valve into the space is easily visible, facilitating installation. Furthermore, when the elastic valve is fitted into the space formed between the outer and inner tubular portions, multiple protrusions formed at predetermined intervals around the circumferential direction of the tubular support member on the inner circumferential surface of the outer tubular portion or the outer circumferential surface of the inner tubular portion bite into the elastic valve, preventing it from slipping out of the space. This configuration eliminates the need for a means (component) to secure the elastic valve within the space, thereby reducing costs. Furthermore, the inner tubular portion extends upward from the inner circumferential edge of the annular connecting portion to a position approximately equal to the tip of the outer tubular portion, thereby firmly holding the elastic valve when fitted into the space.

[0008] The invention described in claim 2 is characterized in that, in the invention described in claim 1, the multiple protrusions are arranged alternately at predetermined intervals in the circumferential direction of the inner surface of the outer cylindrical portion and the outer surface of the inner cylindrical portion. In the cap according to this aspect, by arranging multiple protrusions alternately at predetermined intervals in the circumferential direction on the inner surface of the outer tube portion and the outer surface of the inner tube portion, the elastic valve body can be firmly fixed in the space, making it difficult for it to slip out of the space.

[0009] The invention described in claim 3 is characterized in that, in the invention described in claim 1, the multiple protrusions are arranged in steps so that adjacent protrusions have a height difference in the axial direction of the cylindrical support part. In the cap of this embodiment, adjacent protrusions of the multiple protrusions are arranged in steps to create a difference in height in the axial direction of the cylindrical support part. This causes a difference in the timing at which the elastic valve body overcomes the protrusions when fitting the elastic valve body into a space, and distributes the resistance when the elastic valve body overcomes the protrusions, making it easier to fit the elastic valve body into the space and facilitating the work.

[0010] The invention described in claim 4 is characterized in that, in the invention described in claim 1, the annular connecting portion is located below the multiple protrusions and has multiple holes formed therein, each having an opening area larger than the area of ​​the bottom surfaces of the multiple protrusions. In the cap according to this aspect, by forming a plurality of holes in the annular connecting portion, when the elastic valve body is fitted into a space, air in the space can escape through the plurality of holes, making it easier to fit the elastic valve body into the space. Also, by making the opening area of ​​the plurality of holes larger than the area of ​​the bases of the plurality of protrusions, the plurality of protrusions can be formed sharply during injection molding.

[0011] The invention described in claim 5 is the invention described in claim 1, characterized in that the multiple protrusions include an inclined portion that is molded by one of the mold members and that inclines radially inward from the upper end to the lower end of the inner tube portion, and an acute-angled corner portion that is formed at the bottom of the inclined portion and that is molded by joining the one mold member and the other mold member together. In the cap according to this aspect, the inclined portion formed by one of the mold members is formed so as to be inclined radially inward from the upper end to the lower end of the inner cylindrical portion, thereby facilitating insertion of the slit valve into the space. Furthermore, by forming the corners at an acute angle by combining the one mold member and the other mold member, the corners bite into the slit valve, making it difficult for the slit valve to slip out of the space. [Effects of the Invention]

[0012] According to the cap of the present invention, a slit valve can be easily attached to the cap body, and a cap can be provided that allows the attachment state of the slit valve to be easily checked. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a cross-sectional view of a closed state of a cap attached to the mouth of a squeeze container according to an embodiment of the present invention. [Figure 2]2(a) and 2(b) are diagrams showing the cap body shown in FIG. 1, where (a) is a plan view, (b) is a bottom view, and (c) is a cross-sectional view taken along line AA shown in FIG. 2(a). [Figure 3] 3(a) and 3(b) are enlarged views of the cap body shown in FIG. 2(b), (b) and (c) are enlarged views of the part B shown in FIG. 2(b), (c) and (d) are enlarged views of the part D shown in FIG. 3(b). [Figure 4] 4(a) and 4(b) are diagrams showing the slit valve shown in FIG. 1, where (a) is a plan view, (b) is a bottom view, and (c) is a cross-sectional view taken along line EE shown in FIG. 4(a). [Figure 5] 3(B) is a diagram showing the state of a mold when molding the protrusion of the cap body shown in FIG. 3(C). FIG. [Figure 6] 6(a) and 6(b) are views showing another embodiment of the cap body shown in FIG. 1, in which (a) is a plan view, (b) is a bottom view, and (c) is a cross-sectional view taken along line FF shown in FIG. 6(a). [Figure 7] 7A and 7B are partial enlarged views of the cap body shown in FIG. 6, where (a) is an enlarged view of part G shown in FIG. 6B, and (b) is an enlarged view of part H shown in FIG. 6C. [Figure 8] 8(a) and 8(b) are diagrams showing another form of the cap body shown in FIG. 1, where (a) is a plan view, (b) is a bottom view, and (c) is a cross-sectional view taken along line II shown in FIG. 8(a). [Figure 9] 9A and 9B are partial enlarged views of the cap body shown in FIG. 8, where (a) is an enlarged view of a portion J shown in FIG. 8B, and (b) is an enlarged view of a portion K shown in FIG. 8C. [Figure 10] 10(a) and 10(b) are views showing a state in which the position at which the protrusions are formed on the cap body shown in FIG. 2 has been changed, where (a) is a cross-sectional view and (b) is an enlarged view of part L in FIG. 10(a). DETAILED DESCRIPTION OF THE INVENTION

[0014] The configuration of a cap according to one embodiment of the present invention will be described in detail below with reference to FIGS. As shown in FIG. 1, a cap 1 according to one embodiment of the present invention is attached to a mouth 5 of a squeeze container 3 (container), and comprises a cap body 11, a slit valve 13 (elastic valve body), and a lid body 15.

[0015] First, the squeeze container 3 to which the cap 1 is attached will be described with reference to FIG. The squeeze container 3 is a container molded from a synthetic resin such as polyethylene, polypropylene, or polyethylene terephthalate (PET), with a body that is easily deformed and restored, and is filled with a viscous content such as honey, dressing, ketchup, lubricant, or caulking agent. The squeeze container 3 has a body 7 and a mouth 5 that is integrally connected to the body 7. The mouth 5 has a male thread 9 formed on its outer periphery.

[0016] Next, the configuration of the cap 1 will be described. As shown in Figures 2 and 3, the cap body 11 of the cap 1 comprises: a substantially disk-shaped mouth closing wall 21 that closes the mouth 5 of the squeeze container 3; an upper cylindrical outer wall portion 23 that hangs down from the outer edge of the mouth closing wall 21; a lower cylindrical outer wall portion 27 that is connected to the lower end of the upper cylindrical outer wall portion 23 via an annular step portion 25 and has a larger diameter than the upper cylindrical outer wall portion 23; a cylindrical inner wall portion 29 that is concentrically provided inside the upper cylindrical outer wall portion 23 with an appropriate gap between them and hangs down from the mouth closing wall 21; and a cylindrical support portion 31 that supports the slit valve 13 and that protrudes upward (above the plane of Figure 1) integrally from the mouth closing wall 21.

[0017] Lower cylindrical outer wall portion 27 has an inner wall surface formed with a female thread portion 33 that screws onto male thread portion 9 of mouth portion 5 of squeeze container 3. A fitting space 35 for inserting mouth portion 5 of squeeze container 3 is formed between upper cylindrical outer wall portion 23 and cylindrical inner wall portion 29. The outer peripheral edge of cylindrical inner wall portion 29 on its lower end side is tapered to facilitate fitting with mouth portion 5 of squeeze container 3, and when mouth 5 is screwed onto cap body 11, the outer peripheral wall thereof is in close contact with the inner peripheral surface of mouth portion 5 of squeeze container 3.

[0018] The cylindrical support portion 31 includes an outer cylindrical portion 37 integrally projecting upward from the opening closure wall 21, an inner cylindrical portion 41 concentrically disposed inside the outer cylindrical portion 37, and an annular connecting portion 39 extending radially inward from the lower inner circumferential surface of the outer cylindrical portion 37, connecting the outer cylindrical portion 37 and the inner cylindrical portion 41. A space 43 for fitting the slit valve 13 is formed between the outer cylindrical portion 37 and the inner cylindrical portion 41. The outer cylindrical portion 37 has a tapered outer circumferential edge on its distal end side to facilitate engagement with the sealing cylindrical portion 77 (see below) of the lid 15, and is formed with an annular ridge locking portion 47 that locks with the annular protrusion 77 of the sealing cylindrical portion 73 of the lid 15 (see FIG. 3(b)). The inner circumferential surface of the outer cylindrical portion 37 slopes radially inward from the distal end to the proximal end. Furthermore, outer cylindrical portion 37 has discharge passage 45 penetrating opening closure wall 21. Inner cylindrical portion 41 extends upward from the inner peripheral edge of annular connecting portion 39, specifically, to a position approximately equal to the tip of outer cylindrical portion 37. Inner cylindrical portion 41 has a flow path 49 that communicates with discharge passage 45 of outer cylindrical portion 37, and a plurality of protrusions 51 are formed on the outer peripheral surface of inner cylindrical portion 41 to prevent slit valve 13 from slipping out of space 43 of cylindrical support portion 31 when slit valve 13 is fitted (press-fitted) into space 43 of cylindrical support portion 31. The multiple protrusions 51 have an inclined portion 53 that slopes radially inward from the upper end to the lower end of the inner cylindrical portion 41 to facilitate insertion of the slit valve 13 deep into the space 43 between the outer cylindrical portion 37 and the inner cylindrical portion 41, and an acute corner 55 formed at the bottom of the inclined portion 53 to prevent the slit valve 13 from slipping out of the space 43. The multiple protrusions 51 are disposed closer to the base end than the tip of the inner cylindrical portion 41. The annular connecting portion 39 has multiple holes 57 that are formed at predetermined intervals in the circumferential direction during molding of the cap body 11 (specifically, molding of the multiple protrusions 51 of the inner cylindrical portion 41). As shown in FIG. 3 , the multiple holes 57 of the annular connecting portion 39 are formed below the multiple protrusions 51 of the inner cylindrical portion 41, respectively, and have an opening area larger than the area of ​​the bottom surface of the protrusions 51. As shown in FIG. 5, the plurality of protrusions 51 of the inner cylindrical part 41 of the cylindrical support part 31 are formed by an upper (one) mold part 40a and a lower (other) mold part 40b.That is, the upper mold part 40a forms the inclined portions 53 of the multiple protrusions 51, while the multiple holes 57 in the annular connecting part 39 allow the upper mold part 40a and the lower mold part 40b to be brought together during molding, thereby forming the sharp corners 55 of the multiple protrusions 51.

[0019] As shown in FIG. 4 , the slit valve 13 (elastic valve element) is formed from a flexible elastic material, specifically, rubber such as silicone or synthetic resin such as elastomer. The slit valve 13 is attached to the cylindrical support portion 31 and includes a fitting cylindrical portion 59, a valve portion 61, and an annular thin-walled portion 63 connecting the fitting cylindrical portion 59 and the valve portion 61. The outer peripheral wall of the fitting cylindrical portion 59 slopes radially inward from its upper end to its lower end. The valve portion 61 has a spherical recess 65 recessed on its upper surface toward the upstream side (squeeze container 3 side), and its thickness gradually decreases from the outer peripheral edge toward a center point O. The valve portion 61 is formed with a slit 67 extending radially outward from the center point O. The slit 67 is formed by two linear slits 67 that are formed approximately perpendicular to each other, and is configured to open and close depending on the difference between the pressure (internal pressure) in the squeeze container 3 and atmospheric pressure. Specifically, in operation of the slit valve 13, by squeezing the body 7 of the squeeze vessel 3 and applying pressure to the inside of the squeeze vessel 3, the pressure inside the squeeze vessel 3 (internal pressure) becomes higher than atmospheric pressure, the slit 67 of the valve portion 61 is displaced outward (downstream), and the slit 67 is pushed open (opened), and on the other hand, when squeezing the body 7 of the squeeze vessel 3 is stopped, the pressure decreases and the elasticity of the squeeze vessel 3 and the valve portion 61 causes them to return to their original shapes while sucking in outside air, thereby closing the slit 67, and the pressure inside the squeeze vessel 3 (internal pressure) becomes equal to atmospheric pressure, so that the slit 67 remains closed. The annular thin-walled portion 63 has an outer circumferential edge integrally connected to an upper inner circumferential surface of the fitting cylindrical portion 59, and an inner circumferential edge integrally connected to an outer circumferential upper surface of the valve portion 61.

[0020] As shown in FIG. 1 , the lid 15 is formed separately from the cap body 11, has a bottomed cylindrical shape, and includes a disk portion 69, a cylindrical wall portion 71 depending from the outer edge of the disk portion 69, a sealing cylinder portion 73 concentrically disposed inside the cylindrical wall portion 71 and depending from the underside of the disk portion 69, and a pressing cylinder portion 75 concentrically disposed inside the sealing cylinder portion 73 and depending from the underside of the disk portion 69. The inner peripheral edge of the sealing cylinder portion 73 is tapered to facilitate engagement with the outer cylinder portion 37 of the cylindrical support portion 31, and an annular protrusion 77 is formed on the inner peripheral surface to engage with the annular ridge locking portion 47 of the outer cylinder portion 37. The pressing cylinder portion 75 prevents the slit 67 from sticking when the lid 15 is attached to the cap body 11.

[0021] Next, assembly of the cap 1 according to one embodiment of the present invention will be described. First, the cap body 11 and the slit valve 13, which are separate bodies, are positioned above the space 43 (above the paper in Figure 2(c)) so that the engaging cylindrical portion 59 of the slit valve 13 is fitted (pressed) into the space 43 formed between the outer cylindrical portion 37 and the inner cylindrical portion 41.

[0022] Then, by pressing the upper portion of fitting cylindrical portion 59 toward space 43, fitting cylindrical portion 59 is inserted into space 43. At this time, fitting cylindrical portion 59 climbs over the multiple protrusions 51 of inner cylindrical portion 41 and is inserted until the lower surface of fitting cylindrical portion 59 contacts connecting portion 39 of cylindrical support portion 31, thereby completing the assembly of cap body 11 and slit valve 13.

[0023] The cap 1 according to one embodiment can provide the following advantages. When assembling the slit valve 13 and the cap body 11, when the fitting cylindrical portion 59 of the slit valve 13 is fitted into the space 43 formed between the outer cylindrical portion 37 and the inner cylindrical portion 41, the corners 55 of the multiple protrusions 51 of the inner cylindrical portion 41 bite into the inner peripheral surface of the fitting cylindrical portion 59, making it difficult for the fitting cylindrical portion 59 to come out of the space 43. Furthermore, by having the multiple protrusions 51 bite into the fitting cylindrical portion 59, it is made difficult for the fitting cylindrical portion 59 to come out of the space 43, so there is no need to provide a means (component) for fixing the fitting cylindrical portion 59 to the space 43, thereby reducing costs.

[0024] The fitting cylindrical portion 59 of the slit valve 13 is fitted from above (above the page in Figure 3(b)) into the space 43 formed between the outer cylindrical portion 37 and the inner cylindrical portion 41 without any circumferential restriction, so there are no obstacles when fitting, and the alignment of the fitting cylindrical portion 59 into the space 43 is easy to see, making the installation work easy.

[0025] The inner peripheral surface of the outer tube portion 37 is configured to slope radially inward from the tip end to the base end, and the outer peripheral wall of the fitting tube portion 59 of the slit valve 13 is configured to slope radially inward from the upper end to the lower end, so that when fitting the fitting tube portion 59 into the space 43, the fitting tube portion 59 can be easily inserted into the space 43.

[0026] The inner cylindrical portion 41 extends outward from the inner peripheral edge of the annular connecting portion 39 to a position approximately equal to the tip of the outer cylindrical portion 37, so that when the slit valve 13 is fitted into the space 43, the fitting cylindrical portion 59 of the slit valve 13 can be firmly held in place.

[0027] The inclined portions 53 of the multiple protrusions 51 of the inner cylindrical portion 41 are inclined radially inward from the upper end to the lower end of the inner cylindrical portion 41, making it easier for the fitting cylindrical portion 59 of the slit valve 13 to fit deeply into the space 43. Furthermore, the corners 55 of the multiple protrusions 51 are formed at acute angles, so that when the slit valve 13 is fitted into the space 43, they bite into the fitting cylindrical portion 59 of the slit valve 13, making it difficult for the slit valve 13 to come out of the space 43.

[0028] Since a plurality of holes 57 are formed in the annular connecting portion 39 of the cylindrical support portion 31, when the fitting cylindrical portion 59 is fitted into the space 43, air within the space 43 escapes through the plurality of holes 57, making it easier to fit (press-fit) the fitting cylindrical portion 59 into the space 43. Furthermore, since the plurality of holes 57 are blocked by the fitting cylindrical portion 59 and the fitting cylindrical portion 59 is in close contact with the inner wall surface of the space 43, i.e., the inner circumferential surface of the outer cylindrical portion 37 and the outer circumferential surface of the inner cylindrical portion 41, leakage of the contents from the squeeze container 3 can be prevented when the contents are dispensed.

[0029] In the cap 1 according to the embodiment, in the example described above, the multiple protrusions 51 are formed on the outer peripheral surface of the inner tube portion 41, but as shown in Figures 6 and 7, the protrusions 51 may be formed on the inner peripheral surface of the outer tube portion 37, or as shown in Figures 8 and 9, the protrusions 51 may be formed alternately on the inner peripheral surface of the outer tube portion 37 and the outer peripheral surface of the inner tube portion 41. In this case, the positions of the multiple protrusions 51 and the multiple holes 57 differ from the configuration of the cap body 11 described above, but the other configurations are the same. Specifically, in the cap body 11 shown in FIGS. 6 and 7 , multiple protrusions 51 are formed at predetermined intervals in the circumferential direction on the inner circumferential surface of the outer tube portion 37. The multiple protrusions 51 are provided closer to the base end than the tip of the inner tube portion 41. The multiple holes 57 in the annular connecting portion 39 are formed at predetermined intervals in the circumferential direction near the connection between the outer tube portion 37 and the annular connecting portion 39. In addition, in the cap body 11 shown in FIGS. 8 and 9 , the protrusions 51 are formed alternately at predetermined intervals on the inner circumferential surface of the outer tube portion 37 and the outer circumferential surface of the inner tube portion 41. The multiple protrusions 51 are provided closer to the base end than the tip of the inner tube portion 41. The multiple holes 57 in the annular connecting portion 39 are formed alternately at predetermined intervals in the circumferential direction near the connection between the outer tube portion 37 and the annular connecting portion 39 and near the connection between the inner tube portion 41 and the annular connecting portion 39.

[0030] In this way, even in the cap 1 having the cap body 11 shown in Figures 6 to 9, when the slit valve 13 is fitted into the space 43, the corners 55 of the multiple protrusions 51 bite into the fitting cylindrical portion 59, making it difficult for the fitting cylindrical portion 59 to come out of the space 43, and also making it easy to attach the slit valve 13 to the cap body 11, thereby achieving the same effects as the cap 1 of one embodiment.

[0031] 6 to 9, slit 67 of slit valve 13 is formed as two linear slits that intersect at right angles, but may be a single linear slit. Furthermore, valve portion 61 of slit valve 13 is configured so that, when pressure is applied to the squeeze vessel 3, the pressure (internal pressure) within the squeeze vessel 3 becomes higher than atmospheric pressure, causing valve portion 61 of slit valve 13 to displace downstream; however, valve portion 61 of slit valve 13 may be configured so that it does not displace due to changes in pressure.

[0032] In the cap 1 according to one embodiment and the cap 1 including the cap body 11 shown in Figures 6 to 9, the multiple protrusions 51 formed alternately on the outer peripheral surface of the inner cylindrical portion 41, the inner peripheral surface of the outer cylindrical portion 37, or the inner peripheral surface of the outer cylindrical portion 37 and the outer peripheral surface of the inner cylindrical portion 41 are formed at the same position in the axial direction of the outer cylindrical portion 37 and the inner cylindrical portion 41. However, for example, as shown in Figure 10, adjacent protrusions 51 formed on the outer peripheral surface of the inner cylindrical portion 41 may be formed at different positions in the axial direction of the inner cylindrical portion 41, i.e., in staggered steps to provide a height difference, or may be formed in staggered steps like a spiral staircase from the base end to the tip end in the axial direction of the inner cylindrical portion 41. With this configuration, when the slit valve 13 is fitted into the space 43, there is a difference in the timing at which the slit valve 13 climbs over the protrusions 51, and the resistance when the protrusions 51 climb over them is dispersed, making it easier to fit the slit valve 13 into the space 43 and facilitating the operation. In addition, the present invention can also be applied to adjacent protrusions 51 formed on the inner surface of the outer tube portion 37, and adjacent protrusions 51 formed alternately on the inner surface of the outer tube portion 37 and the outer surface of the inner tube portion 41.

[0033] In one embodiment of the cap 1, the lid body 15 is separate from the cap body 11, but the lid body 15 may be connected to the cap body 11 via a hinge, or a male threaded portion may be formed on the upper cylindrical outer wall portion 23 of the cap body 11 and a female threaded portion may be formed on the cylindrical wall portion 71 of the lid body 15 so that the lid body 15 is screwed onto the cap body 11.

[0034] In one embodiment of the cap 1, a female thread portion 33 is formed on the lower cylindrical outer wall portion 25 of the cap body 11, and a male thread portion 9 is formed on the mouth portion 5 of the squeeze container 3, so that the cap body 11 is screwed onto the mouth portion 5, but the cap body 11 may also be configured to be fitted into the mouth portion 5. [Explanation of symbols]

[0035] 1...cap, 3...squeeze container (container), 5...mouth portion, 11...cap body, 13...slit valve (elastic valve body), 21...mouth portion closing wall, 31...cylindrical support portion, 37...outer cylinder portion, 39...annular connecting portion, 41...inner cylinder portion, 43...space, 45...discharge path, 51...plurality of protrusions, 67...slit

Claims

1. A cap to be attached to the mouth of a container that contains contents, a cap body including: a mouth-closing wall attached to the mouth and closing the mouth; an outer tube portion having a discharge passage penetrating the mouth-closing wall and projecting upward integrally from the mouth-closing wall; an inner tube portion provided concentrically inside the outer tube portion; and a cylindrical support portion extending radially inward from a lower inner peripheral surface of the outer tube portion and having an annular connecting portion connecting the outer tube portion and the inner tube portion; a fitting cylindrical portion that is press-fitted from above into a space formed between the outer cylindrical portion and the inner cylindrical portion, and an elastic valve body having a valve portion with a slit that opens when the container is pressurized, the inner cylindrical portion extends outward from the inner peripheral edge of the annular connecting portion to a position substantially equal to the tip of the outer cylindrical portion, A cap characterized in that a plurality of protrusions that bite into the valve body are formed at a predetermined interval around the circumferential direction of the cylindrical support part on at least one of the inner surface of the outer cylindrical part or the outer surface of the inner cylindrical part of the cylindrical support part.

2. 2. The cap according to claim 1, wherein the plurality of protrusions are provided alternately at predetermined intervals in the circumferential direction on the inner circumferential surface of the outer cylindrical portion and the outer circumferential surface of the inner cylindrical portion.

3. The cap according to claim 1 , wherein the plurality of protrusions are arranged in a stepped manner so that adjacent protrusions have a difference in height in the axial direction of the cylindrical support portion.

4. The cap according to claim 1 , wherein the annular connecting portion is located below the plurality of protrusions and has a plurality of holes formed therein, the holes having an opening area larger than the area of ​​the bottom surfaces of the plurality of protrusions.

5. The cap described in claim 1, characterized in that the multiple protrusions include an inclined portion that slopes radially inward from the upper end to the lower end of the inner tube portion, which is molded by one of the mold members, and a sharp corner portion formed at the bottom of the inclined portion, which is molded by joining the one mold member and the other mold member.

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