Cap and container

Abstract

To provide a cap capable of improving sealing performance while keeping a thickness of a sealing part thin.SOLUTION: A cap 3 has: a cap body 15 mounted on a mouth portion 5 of a container body 2; and a lid 17 for opening and closing an outlet 16 of the cap body 15. The cap body 15 has: an inner peripheral wall 20 fitted to an inner periphery of the mouth portion 5; an outer peripheral wall 21 fitted to an outer periphery of the mouth portion 5; and a top wall 22 formed between the inner peripheral wall 20 and the outer peripheral wall 21. An insertion portion 24 into which the mouth portion 5 can be inserted, is formed between the inner peripheral wall 20 and the outer peripheral wall 21 and below the top wall 22. The top wall 22 has a sealing portion 35 that contacts a tip of the mouth portion 5 inserted into the insertion portion 24. The sealing portion 35 is formed with a U-shaped cross-section, and is deformable in an axial direction 8 and a radial direction 9 of the cap body 15. The lid 17 has an insertion portion 41 that fits inside the inner peripheral wall 20 of the cap body 15 when the cap is closed.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a cap that is attached to the mouth of a container body, and a container equipped with a cap. [Background technology]

[0002] Conventionally, for example, the following patent document discloses a cap having a cap body that is attached to the mouth of a container body, a body top plate provided on the cap body, a dispensing tube provided on the body top plate, and an upper lid that opens and closes the dispensing tube.

[0003] A side wall of the main body extends downward from the periphery of the top plate of the main body. An insertion ring extends downward from the top plate of the main body, inward from the side wall of the main body. An insertion hole is formed between the side wall of the main body and the insertion ring and below the top plate of the main body, into which the mouth of the container body can be inserted.

[0004] A contact ring is formed on the underside of the top plate of the main body, which contacts the tip of the mouth of the container body inserted into the insertion part. The contact ring is a mountain-shaped ring with a downward-pointing lower end.

[0005] According to this, when the mouth of the container body is inserted into the insertion portion and the cap body is attached to the mouth of the container body, the contact ring comes into contact with the tip of the mouth of the container body, thereby sealing the gap between the cap body and the mouth of the container body. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication No. 2019-127269 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the above-mentioned conventional type, in order to improve the sealing performance of the contact ring, it is necessary to make the contact ring larger, which poses a problem of increasing the wall thickness of the contact ring. An object of the present invention is to provide a cap and a container that can improve sealing performance while maintaining a thin wall thickness of the sealing portion. [Means for solving the problem]

[0008] In order to achieve the above object, the first invention provides a cap having a cap body attached to the mouth of a container body, a pouring outlet formed in the cap body, and a lid for opening and closing the pouring outlet, The cap body has an inner peripheral wall fitted to the inner periphery of the mouth portion, an outer peripheral wall fitted to the outer periphery of the mouth portion, and a top wall formed between the inner peripheral wall and the outer peripheral wall, an insertion portion into which the mouth portion can be inserted is formed between the inner peripheral wall and the outer peripheral wall and below the top wall; the top wall has a seal portion that contacts the tip of the opening portion inserted into the insertion portion, The sealing portion has a U-shaped or V-shaped cross section and is deformable in the axial direction and the radial direction of the cap body, The lid has a fitting portion that fits inside the inner peripheral wall of the cap body when in the closed state.

[0009] By inserting the mouth of the container body into the insertion part of the cap body, the inner peripheral wall of the cap body fits into the inner periphery of the mouth, the outer peripheral wall fits into the outer periphery of the mouth, and the seal part comes into contact with the tip of the mouth, thereby attaching the cap body to the mouth of the container body and sealing the gap between the cap body and the mouth of the container body by the seal part.

[0010] Because the sealing portion has a U-shaped or V-shaped cross section, when the cap body is attached to the mouth of the container body, the sealing portion is compressed in the axial direction of the cap body, generating sufficient repulsive force while maintaining the thickness of the sealing portion thin, thereby improving sealing performance.

[0011] In the cap according to the second aspect of the present invention, the inner peripheral wall has a bent portion bent inward in the radial direction, and a first tapered portion formed above the bent portion and gradually increasing in diameter from the bent portion, The inner peripheral edge of the top wall is connected to the first tapered portion at a position above the contact point between the seal portion and the tip of the mouth portion.

[0012] According to this, when the cap body is attached to the mouth of the container body and the lid is attached to the cap body to close the spout, the fitting portion of the lid fits inside the inner peripheral wall of the cap body, and the first tapered portion of the inner peripheral wall is pressed radially outward by the fitting portion of the lid. In this state, because the inner peripheral edge of the top wall is connected to the first tapered portion, a downward pressing force is generated on the top wall from the first tapered portion, pressing the seal portion against the tip of the mouth of the container body. This ensures sufficient contact pressure between the seal portion and the tip of the mouth.

[0013] The third invention is a cap having a cap body attached to the mouth of a container body, a pouring outlet formed in the cap body, and a lid for opening and closing the pouring outlet, The cap body has an inner peripheral wall fitted to the inner periphery of the mouth portion, an outer peripheral wall fitted to the outer periphery of the mouth portion, and a top wall formed between the inner peripheral wall and the outer peripheral wall, an insertion portion into which the mouth portion can be inserted is formed between the inner peripheral wall and the outer peripheral wall and below the top wall; the inner circumferential wall has a bent portion bent radially inward, and a first tapered portion formed above the bent portion and gradually increasing in diameter from the bent portion; an inner peripheral edge of the top wall is connected to the first tapered portion at a position above the contact point between the sealing portion and the tip of the mouth portion; the top wall has a seal portion that contacts the tip of the opening portion inserted into the insertion portion, The lid has a fitting portion that fits inside the inner peripheral wall of the cap body when in the closed state.

[0014] By inserting the mouth of the container body into the insertion part of the cap body, the inner peripheral wall of the cap body fits into the inner periphery of the mouth, the outer peripheral wall fits into the outer periphery of the mouth, and the seal part comes into contact with the tip of the mouth, thereby attaching the cap body to the mouth of the container body and sealing the gap between the cap body and the mouth of the container body by the seal part.

[0015] When the lid is attached to the cap body to close the spout, the fitting portion of the lid fits inside the inner peripheral wall of the cap body, and the first tapered portion of the inner peripheral wall is pressed radially outward by the fitting portion of the lid. In this state, because the inner peripheral edge of the top wall is connected to the first tapered portion, a downward pressing force is generated from the first tapered portion on the top wall, pressing the seal portion against the tip of the mouth of the container body. This ensures sufficient contact pressure between the seal portion and the tip of the mouth.

[0016] In the cap according to the fourth aspect of the present invention, the seal portion has a U-shaped or V-shaped cross section and is deformable in the axial and radial directions of the cap body.

[0017] As a result, when the cap body is attached to the mouth of the container body and the sealing portion is compressed in the axial direction of the cap body, a sufficient repulsive force is generated while maintaining the thickness of the sealing portion thin, thereby improving sealing performance.

[0018] In the cap according to the fifth aspect of the present invention, the inner peripheral wall has a second tapered portion formed below the bent portion and gradually increasing in diameter from the bent portion, The second tapered portion is fitted into the mouth portion and is in contact with the inner periphery of the mouth portion.

[0019] As a result, in addition to the sealing portion contacting the tip of the mouth, the second tapered portion contacts the inner circumference of the mouth, so the space between the cap body and the mouth of the container body is sealed in two places, improving sealing performance.

[0020] In the cap according to the sixth aspect of the present invention, the fitting portion of the lid has a third tapered portion that fits into the inside of the second tapered portion of the inner peripheral wall, The third tapered portion extends along the inside of the second tapered portion and gradually increases in diameter downward.

[0021] According to this, when the lid is attached to the cap body and the spout is closed, the third tapered portion of the fitting portion of the lid fits inside the second tapered portion of the inner peripheral wall of the cap body. In this closed state, if a force in the opening direction is inadvertently applied to the lid, the outer peripheral surface of the third tapered portion of the lid is pressed against the inner peripheral surface of the second tapered portion of the cap body, improving the sealing performance between the lid and the cap body.

[0022] In the seventh aspect of the present invention, the cap has a first engagement portion formed on an outer peripheral wall of the cap body, The first engaging portion engages with the second engaging portion formed in the mouth portion to prevent the cap body from being separated from the mouth portion.

[0023] According to this, by inserting the mouth of the container body into the insertion portion of the cap body, the inner peripheral wall of the cap body fits into the inner periphery of the mouth, the outer peripheral wall fits into the outer periphery of the mouth, and the seal portion contacts the tip of the mouth. In this way, the cap body is attached to the mouth of the container body. At this time, the first engaging portion engages with the second engaging portion, preventing the cap body from accidentally coming off the mouth.

[0024] The eighth invention is a container provided with the cap according to any one of the first, second and fourth inventions, The mouth of the container body is inserted into the insertion portion of the cap, and when the cap body is attached to the mouth of the container body, the seal portion is pressed against the tip of the mouth. This allows the thickness of the seal portion to be kept thin while still generating a sufficient repulsive force, thereby improving the sealing performance. [Effects of the Invention]

[0025] As described above, according to the present invention, it is possible to improve the sealing performance while maintaining a thin wall thickness of the seal portion. [Brief explanation of the drawings]

[0026] [Figure 1] 1 is a cross-sectional view of a mouth portion of a container equipped with a cap in a first embodiment of the present invention. [Figure 2] FIG. 2 is an enlarged cross-sectional view of a portion of the opening of the container. [Figure 3] FIG. [Figure 4] 10 is a cross-sectional view showing the process of attaching the cap to the container body. FIG. [Figure 5] 10 is a cross-sectional view showing the process of attaching the cap to the container body. FIG. [Figure 6] FIG. 10 is a cross-sectional view showing the state when the cap has been attached. [Figure 7] 10 is a graph showing the relationship between the elapsed time when the cap is attached to the container body and the contact pressure at the first to third contact points. [Figure 8] 10 is an enlarged cross-sectional view of a portion of the opening of the container in accordance with the first embodiment, showing the pressing force acting on the sealing portion. [Figure 9] FIG. 2 is a diagram of a reference example of the first embodiment of the present invention, showing an enlarged cross section of a part of the mouth of a container. [Figure 10] 10 is a graph showing the relationship between the elapsed time when the cap is attached to the container body and the contact pressure at the fourth to sixth contact points in the reference example. [Figure 11] 10 is a graph showing contact pressures at first to sixth contact points in the first embodiment of the present invention and a reference example. [Figure 12] FIG. 6 is a partially enlarged cross-sectional view of the opening of a container equipped with a cap in a second embodiment of the present invention. [Figure 13] 10 is a graph showing the relationship between the contact pressure at the first contact point and the elapsed time when the cap is attached to the container body by fastening it thereto. [Figure 14]10 is a graph showing contact pressures at the first to third contact points in the same example. [Figure 15] FIG. 10 is a partially enlarged cross-sectional view of the opening of a container equipped with a cap in a third embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0027] Hereinafter, embodiments of the present invention will be described with reference to the drawings. (First embodiment)

[0028] In the first embodiment, as shown in Fig. 1, reference numeral 1 denotes a container comprising a container body 2 and a cap 3. The container body 2 has a cylindrical opening 5 at its upper end. Here, the direction of an axis 7 passing through the center of the cap 3 is defined as the up-down direction 8, the direction perpendicular to the axis 7 as the radial direction 9, and the circumferential direction around the axis 7 as the circumferential direction 10. A flange 13 (an example of a second engaging portion) that projects outward in the radial direction 9 is formed around the entire outer periphery of the tip of the mouth portion 5.

[0029] The cap 3 is thinner and lighter than conventional caps, and has a cap body 15 attached to the mouth 5 of the container body 2, a spout 16 formed in the cap body 15, and a lid 17 that can be attached and detached to the cap body 15 and that opens and closes the spout 16.

[0030] As shown in Figures 1 to 3, the cap body 15 has a cylindrical inner wall 20 that is fitted into the inner circumference of the mouth portion 5, a cylindrical outer wall 21 that is fitted into the outer circumference of the mouth portion 5, and a top wall 22 that is formed around the entire circumference between the inner wall 20 and the outer wall 21.

[0031] The spout 16 is formed on the inside of the inner peripheral wall 20 in the radial direction 9. Between the inner peripheral wall 20 and the outer peripheral wall 21 and below the top wall 22, an insertion portion 24 into which the spout 5 can be inserted is formed around the entire periphery.

[0032] The inner peripheral wall 20 has, around the entire circumference, a bent portion 26 that is bent inward in the radial direction 9, a first tapered portion 27 that is formed above the bent portion 26 and gradually increases in diameter from the bent portion 26, and a second tapered portion 28 that is formed below the bent portion 26 and gradually increases in diameter from the bent portion 26.

[0033] The upper end of first tapered portion 27 is formed as a dripping portion 30 that curves outward in radial direction 9. Second tapered portion 28 is fitted into mouth portion 5 and contacts the inner periphery of mouth portion 5 over the entire circumference.

[0034] The outer peripheral wall 21 extends downward further than the inner peripheral wall 20. An engaging protrusion 32 (an example of a first engaging portion) that protrudes inward in the radial direction 9 is formed around the entire circumference at the lower end of the outer peripheral wall 21. The engaging protrusion 32 can engage with the flange 13 from below, thereby preventing the cap body 15 from coming off the mouth portion 5 upward.

[0035] The top wall 22 has a seal portion 35 around the entire periphery that contacts the tip of the opening portion 5 inserted into the insertion portion 24. The seal portion 35 has a U-shaped cross section and is elastically deformable in the vertical direction 8 (an example of the axial direction) and the radial direction 9.

[0036] If the point where the seal portion 35 contacts the tip of the mouth portion 5 is defined as a first contact point 37 (an example of a contact point), the inner peripheral end 22a of the top wall 22 is connected to the first tapered portion 27 at a position above the first contact point 37. Moreover, the outer peripheral end 22b of the top wall 22 is connected to the upper end of the outer peripheral wall 21 at a position above the contact point 37. When the cap body 15 is attached to the mouth 5 of the container body 2, the seal portion 35 is pressed against the tip of the mouth 5.

[0037] 1, the lid 17 is connected to the cap body 15 via a hinge 38 so as to be rotatable in opening and closing directions 46 and 47. The hinge 38 is connected to a portion of the lid 17 in the circumferential direction 10 and a portion of the cap body 15 in the circumferential direction 10. As shown in FIGS. 1 to 3, the lid 17 has a disk-shaped lid body 40 and a fitting portion 41 that fits inside the inner circumferential wall 20 in the closed state.

[0038] The fitting portion 41 of the lid 17 is formed around the entire periphery of the lid body 40, and has a third tapered portion 43 that fits inside the second tapered portion 28 of the inner wall 20, and a fourth tapered portion 44 that fits inside the first tapered portion 27 around the entire periphery.

[0039] The third tapered portion 43 gradually increases in diameter downward along the inside of the second tapered portion 28. The fourth tapered portion 44 gradually increases in diameter upward along the inside of the first tapered portion 27 and curves outward in the radial direction 9 in an arc shape. The operation of the above configuration will now be described.

[0040] As shown by the solid line in Fig. 1, the cap 3 is attached by being screwed onto the container body 2 with the lid 17 closed. That is, as shown in Figs. 4 to 6, by screwing the cap 3 from above onto the container body 2 downward using a screwing plate 51 that is movable in the vertical direction 8, the mouth portion 5 of the container body 2 is inserted from below into the insertion portion 24 of the cap body 15, and the cap body 15 is attached to the mouth portion 5.

[0041] As a result, as shown in Figures 1 and 2, the second tapered portion 28 of the inner wall 20 of the cap body 15 is fitted into the inner circumference of the mouth portion 5 and is in contact with it around the entire circumference, and the outer wall 21 is fitted into the outer circumference of the mouth portion 5, the engaging protrusion 32 engages with the flange 13 from below, and further, the sealing portion 35 is pressed against the tip of the mouth portion 5.

[0042] As shown in Figure 2, the point where the second tapered portion 28 of the inner wall 20 is fitted into the inner circumference of the mouth 5 and makes contact around the entire circumference is defined as the second contact point 52, and the point where the inner wall 20 of the cap body 15 and the fitting portion 41 of the lid 17 make contact around the entire circumference is defined as the third contact point 53.When the cap 3 is closed, the inside and outside of the mouth 5 of the container body 2 are sealed at the first, second and third contact points 37, 52 and 53.

[0043] 7 is a graph showing the relationship between the elapsed time T and the contact pressure P acting on the first to third contact points 37, 52, 53 (see FIG. 2) when the cap 3 is attached to the container body 2 (see FIGS. 4 to 6) as described above. Of these, graph G1 shows the relationship between the elapsed time T and the contact pressure P acting on the first contact point 37, graph G2 shows the relationship between the elapsed time T and the contact pressure P acting on the second contact point 52, and graph G3 shows the relationship between the elapsed time T and the contact pressure P acting on the third contact point 53.

[0044] In graph G1, before elapsed time t1, as shown in FIG. 4, the seal portion 35 does not reach the tip of the mouth portion 5 and is separated from the tip of the mouth portion 5, so the contact pressure P is 0.

[0045] Then, when the elapsed time t1 is reached, as shown in FIG. 5, the seal portion 35 comes into contact with the tip of the mouth portion 5 and is compressed in the vertical direction 8, so that the contact pressure P increases suddenly to a maximum value P1.

[0046] 6, after the elapse of the elapsed time t1, the stoppering plate 51 rises and separates from the cap 3. As the time T passes, the seal portion 35 attempts to return to its original shape from its compressed state, and the contact pressure P gradually decreases from the maximum value P1. In this case, even after stoppering is complete, the seal portion 35 does not completely return to its original shape, and remains in pressure contact with the tip of the mouth portion 5. Therefore, in graph G1, the contact pressure P does not become 0, but decreases to a predetermined value P2.

[0047] In graph G2, before elapsed time t2, as shown in Figure 4, the second tapered portion 28 of the inner wall 20 does not reach the inner circumference of the mouth portion 5 and is separated from the inner circumference of the mouth portion 5, so the contact pressure P becomes 0. After that, when the elapsed time reaches t2, the second tapered portion 28 of the inner peripheral wall 20 comes into contact with the inner periphery of the mouth portion 5, and a contact pressure P is generated and increases.

[0048] The seal portion 35 of the cap 3 attached to the container body 2 as described above has a U-shaped cross section, so that a sufficient repulsive force is generated while maintaining a thin thickness of the seal portion 35, thereby improving the sealing performance at the first contact point 37 (see Figure 2).

[0049] 1 and 2, when the cap body 15 is attached to the mouth 5 of the container body 2 and the lid 17 is rotated in the closing direction 47 to close the spout 16, the fitting portion 41 of the lid 17 fits inside the inner circumferential wall 20 of the cap body 15, as shown in FIG. 8, and the first tapered portion 27 of the inner circumferential wall 20 is pressed outward in the radial direction 9 by the fitting portion 41 of the lid 17. In this state, because the inner circumferential end 22a of the top wall 22 is connected to the first tapered portion 27, a downward pressing force F1 is generated from the first tapered portion 27 to the top wall 22, and the seal portion 35 is pressed against the tip of the mouth 5 of the container body 2. This ensures a sufficient contact pressure P when the seal portion 35 comes into contact with the tip of the mouth 5.

[0050] In addition, since the sealing portion 35 contacts the tip of the mouth portion 5 around the entire circumference, and the second tapered portion 28 contacts the inner circumference of the mouth portion 5 around the entire circumference, the space between the cap body 15 and the mouth portion 5 is sealed at two points, the first and second contact points 37, 52, thereby improving sealing performance.

[0051] 1 and 8, when lid 17 is rotated in closing direction 47 to close spout 16, third tapered portion 43 of fitting portion 41 of lid 17 fits inside second tapered portion 28 of inner peripheral wall 20 of cap body 15. In this closed state, if force F2 in opening direction 46 is inadvertently applied to lid 17, the outer peripheral surface of third tapered portion 43 of lid 17 will be pressed against the inner peripheral surface of second tapered portion 28 of cap body 15, improving the sealing performance between cap body 15 and lid 17.

[0052] Furthermore, when the cap body 15 is attached to the mouth 5 of the container body 2, the engaging protrusion 32 engages with the flange 13 from below, thereby preventing the cap body 15 from accidentally coming off upward from the mouth 5.

[0053] 9 shows a reference example to the first embodiment of the present invention, in which the inner peripheral end 22a of the top wall 22 is connected to the upper end of the second tapered portion 28 of the inner peripheral wall 20. A seal portion 60 that contacts the tip of the mouth portion 5 is formed around the entire periphery of the top wall 22. The seal portion 60 has an arc-shaped cross section and protrudes downward from the top wall 22.

[0054] If the point where the sealing portion 60 contacts the tip of the mouth portion 5 is designated as the fourth contact point 62, the point where the second tapered portion 28 of the inner wall 20 is fitted into the inner circumference of the mouth portion 5 and contacts it around the entire circumference is designated as the fifth contact point 63, and the point where the inner wall 20 of the cap body 15 and the fitting portion 41 of the lid 17 contact it around the entire circumference is designated as the sixth contact point 64, when the cap 3 is closed, the inside and outside of the mouth portion 5 of the container body 2 are sealed at the fourth, fifth and sixth contact points 62, 63, 64.

[0055] 8 in the first embodiment is hardly generated on the top wall 22, and therefore the sealing portion 60 is unlikely to be pressed against the tip of the mouth portion 5 of the container body 2. As a result, the contact pressure P at which the sealing portion 60 comes into contact with the tip of the mouth portion 5 cannot be sufficiently ensured, and there is a risk that the sealing performance at the fourth contact point 62 will be reduced.

[0056] 10 is a graph showing the relationship between the elapsed time T when the cap 3 is attached to the container body 2 and the contact pressure P acting on the fourth to sixth contact points 62 to 64. Of these, graph G4 shows the relationship between the elapsed time T and the contact pressure P acting on the fourth contact point 62, graph G5 shows the relationship between the elapsed time T and the contact pressure P acting on the fifth contact point 63, and graph G6 shows the relationship between the elapsed time T and the contact pressure P acting on the sixth contact point 64. In graph G4, before elapsed time t1, the seal portion 60 has not reached the tip of the mouth portion 5 and is separated from the tip of the mouth portion 5, so the contact pressure P is zero.

[0057] Then, when the elapsed time t1 is reached, the seal portion 60 comes into contact with the tip of the mouth portion 5 and is slightly compressed in the vertical direction 8, so that the contact pressure P increases rapidly to a maximum value P3. Note that the maximum value P3 in the reference example is greater than the maximum value P1 (see FIG. 7) in the first embodiment described above.

[0058] After the elapsed time t1, the stoppering plate 51 rises and separates from the cap 3. As the time T passes, the seal portion 60 returns to its original shape from the compressed state, and the contact pressure P gradually decreases from the maximum value P3. In this case, after stoppering is completed, the seal portion 60 completely returns to its original shape, and the contact pressure P decreases to 0 in graph G4.

[0059] Figure 11 is a graph showing the contact pressure P at the first to sixth contact points 37, 52, 53, 62, 63, 64 when an elapsed time t3 (for example, t3 = 2 seconds in the graphs of Figures 7 and 10) has elapsed since the start of stoppering, the stoppering plate 51 has moved away from the cap 3, and stoppering is completed, and the seal portions 35, 60 have restored to their original shape from the compressed state, as shown in Figures 8 and 9.

[0060] According to this, when comparing the first embodiment with the reference example, there is not much difference between the second contact point 52 and the fifth contact point 63, and between the third contact point 53 and the sixth contact point 64. In contrast, for the first contact point 37 and the fourth contact point 62, the contact pressure P at the first contact point 37 is significantly greater than the contact pressure P at the fourth contact point 62. (Second embodiment)

[0061] In the second embodiment, the seal portion 35 has a protrusion 71 that protrudes downward, as shown in Fig. 12. The protrusion 71 is formed around the entire periphery of the lower end of the seal portion 35.

[0062] 13 is a graph showing the relationship between the elapsed time T when the cap 3 is attached to the container body 2 and the contact pressure P acting on the first contact point 37. Before the elapsed time t1, the seal portion 35 has not reached the tip of the mouth portion 5 and is separated from the tip of the mouth portion 5, so the contact pressure P is 0.

[0063] Then, when the elapsed time t1 is reached, the seal portion 35 comes into contact with the tip of the mouth portion 5 and is compressed in the vertical direction 8, so that the contact pressure P increases rapidly to a maximum value P4. At this time, because the seal portion 35 has the protrusion 71, the maximum value P4 becomes larger than the maximum value P1 (see FIG. 7) in the first embodiment described above.

[0064] After the elapsed time t1, the stoppering plate 51 rises and separates from the cap 3. As the time T passes, the seal portion 35 returns to its original shape from its compressed state, and the contact pressure P gradually decreases from the maximum value P4. In this case, even after stoppering is complete, the seal portion 35 does not completely return to its original shape, but remains slightly compressed in the vertical direction 8. Therefore, the contact pressure P does not become 0, but decreases to a predetermined value P5. At this time, because the seal portion 35 has the protrusion 71, the predetermined value P5 is greater than the predetermined value P2 (see FIG. 7) in the first embodiment described above.

[0065] Furthermore, Figure 14 is a graph showing the contact pressure P at the first to third contact points 37, 52, 53 when an elapsed time t3 (for example, t3 = 2 seconds in the graph of Figure 13) has elapsed since the start of stoppering, the stoppering plate 51 has separated from the cap 3, stoppering is completed, and the seal portion 35 having the protrusion 71 has restored to its original shape from the compressed state.

[0066] As a result, because the sealing portion 35 has the protrusion 71, when the cap 3 is attached to the container body 2, a high contact pressure P is generated at the first contact point 37 where the sealing portion 35 comes into contact with the tip of the mouth portion 5. This makes it possible to further improve the sealing performance at the first contact point 37. (Third embodiment)

[0067] In the first and second embodiments described above, the cross section of the seal portion 35 is U-shaped as shown in Figures 2 and 12, but this is not limited to a U-shape, and in a third embodiment, the cross section of the seal portion 35 may be V-shaped as shown in Figure 15.

[0068] In each of the above embodiments, as shown in FIG. 1, the cap 3 is shown in which the cap body 15 and the lid 17 are connected via a hinge 38, but the cap may not have a hinge 38 and the cap body 15 and the lid 17 may be separate. [Explanation of symbols]

[0069] 1 container 2 Container body 3 Cap 5 Mouth 8 Vertical direction (axial direction) 9 Radial 13. Flange (second engagement portion) 15 Cap body 16 spout 17 Lid 20 Inner wall 21 Outer wall 22 Ceiling wall 22a Inner edge of ceiling wall 24 Insertion section 26 Bend 27 First tapered section 28 Second tapered section 32 Engagement protrusion (first engagement part) 35 Seal part 37 First contact point (contact point) 41 Inset part 43 Third taper section

Claims

1. A cap having a cap body attached to the mouth of a container body, a pouring outlet formed in the cap body, and a lid for opening and closing the pouring outlet, The cap body has an inner peripheral wall fitted to the inner periphery of the mouth portion, an outer peripheral wall fitted to the outer periphery of the mouth portion, and a top wall formed between the inner peripheral wall and the outer peripheral wall, an insertion portion into which the mouth portion can be inserted is formed between the inner peripheral wall and the outer peripheral wall and below the top wall; the top wall has a seal portion that contacts the tip of the opening portion inserted into the insertion portion, The sealing portion has a U-shaped or V-shaped cross section and is deformable in the axial direction and the radial direction of the cap body, A cap characterized in that the lid has a fitting portion that fits inside the inner peripheral wall of the cap body when in a closed state.

2. the inner circumferential wall has a bent portion bent radially inward, and a first tapered portion formed above the bent portion and gradually increasing in diameter from the bent portion; 2. The cap according to claim 1, wherein the inner peripheral edge of the top wall is connected to the first tapered portion at a position above the contact point between the sealing portion and the tip of the opening portion.

3. A cap having a cap body attached to the mouth of a container body, a pouring outlet formed in the cap body, and a lid for opening and closing the pouring outlet, The cap body has an inner peripheral wall fitted to the inner periphery of the mouth portion, an outer peripheral wall fitted to the outer periphery of the mouth portion, and a top wall formed between the inner peripheral wall and the outer peripheral wall, an insertion portion into which the mouth portion can be inserted is formed between the inner peripheral wall and the outer peripheral wall and below the top wall; the inner circumferential wall has a bent portion bent radially inward, and a first tapered portion formed above the bent portion and gradually increasing in diameter from the bent portion; an inner peripheral edge of the top wall is connected to the first tapered portion at a position above a contact point between the sealing portion and the tip of the mouth portion; the top wall has a seal portion that contacts the tip of the opening portion inserted into the insertion portion, A cap characterized in that the lid has a fitting portion that fits inside the inner peripheral wall of the cap body when in a closed state.

4. 4. The cap according to claim 3, wherein the seal portion has a U-shaped or V-shaped cross section and is deformable in the axial and radial directions of the cap body.

5. the inner peripheral wall has a second tapered portion formed below the bent portion and gradually increasing in diameter from the bent portion; 5. The cap according to claim 1, wherein the second tapered portion is fitted into the mouth portion and contacts the inner periphery of the mouth portion.

6. the fitting portion of the lid has a third tapered portion that fits inside the second tapered portion of the inner peripheral wall, 6. The cap according to claim 5, wherein the third tapered portion gradually widens in diameter downward along the inside of the second tapered portion.

7. A first engagement portion is formed on the outer peripheral wall of the cap body, 4. The cap according to claim 1, wherein the first engaging portion engages with a second engaging portion formed in the opening portion to prevent the cap body from being separated from the opening portion.

8. A container provided with the cap according to claim 1 or claim 4, A container characterized in that the mouth of the container body is inserted into the insertion part of the cap, and when the cap body is attached to the mouth of the container body, the seal part is pressed against the tip of the mouth.

Images