Discharge cap

Abstract

The invention relates to a discharge cap. The purpose of the present invention is to suppress an external force applied to a container in order to discharge a content liquid (CLq) to a suitable level, to prevent the content liquid (CLq) discharged from a discharge nozzle (29) from becoming too thick, and to improve the cutting properties of the content liquid (CLq) after the discharge. A valve section (49) provided in a slit valve (7A) has: a slit section (49b) provided with a slit (55); and an outer peripheral portion (49a) coupled to the thin cylinder portion (51) (connection portion). The slit portion (49b) is more easily deformed than the outer peripheral portion (49a) due to a pressure change in the inner space of the container. When the content liquid (CLq) is discharged, the slit portion (49b) deforms in the discharge direction of the content liquid (CLq), and after the content liquid (CLq) is discharged, the slit portion (49b) deforms toward the nozzle flow path (29a).

Description

Technical Field

[0001] The invention relates to a discharge cap. Background Art

[0002] A viscous liquid such as a lubricant, a caulking agent, or honey is stored in an elastic container with a discharge cap installed at its mouth. The discharge cap is provided with a nozzle for discharging the liquid (content liquid) stored in the inner space of the container. The nozzle is a hollow cylindrical body with a liquid flow path (nozzle flow path) formed therein. When the discharge cap is installed at the mouth of the container, the nozzle flow path is connected to the inner space of the container. When the content liquid is discharged from the nozzle, an external force is applied to the container. For example, when the nozzle flow path is filled with the content liquid and then the container is squeezed, the pressure in the internal space of the container increases and the content liquid is discharged from the nozzle.

[0003] As such a discharge cap, for example, there is known a discharge cap described in Patent Document 1. In the discharge cap of Patent Document 1, a slit valve having a cross-shaped slit formed in a nozzle is provided. When the discharge cap of Patent Document 1 is mounted on the mouth of a container and external force is applied to the container after the nozzle flow path is filled with content liquid, as the pressure in the internal space of the container increases, the content liquid in the nozzle flow path is pressed toward the slit valve side, and the cross-shaped slit is opened by the content liquid. Thereafter, the content liquid is discharged to the outside through the gap (discharge port) of the slit. When the liquid content is discharged and the external force on the container is released, the container expands due to its elasticity, and the liquid content and air near the slit are sucked into the nozzle flow path (sucked back). When the container returns to its original shape, the slit closes.

[0004] For the container with the discharge cap installed, the external force required for discharging the content liquid does not need to be too large. For example, even if the content liquid is a high-viscosity liquid such as a lubricant or honey, it only needs to apply an external force of appropriate size to the container to discharge the content liquid. Among them, in order to suppress the magnitude of the external force applied to the container, the slit provided in the valve may be lengthened. However, simply increasing the length of the slit may lead to another problem, that is, the content liquid discharged from the nozzle becomes too thick. In addition, there may also be a problem that the cut-off property of the content liquid after discharge becomes poor. For example, after the external force on the container is released, there is a concern that the content liquid that cannot return to the nozzle flow path may extend into a rope shape and adhere to the outer surface of the cap. Prior art literature Patent Literature

[0005] Patent Document 1: Japanese Patent No. 6345040 Summary of the invention Problems to be solved by the invention

[0006] Thus, the conventional discharge cap has a problem in that when the slit is lengthened to suppress the external force applied to the container, the content liquid discharged from the nozzle becomes too thick. The present invention is completed in view of the above-mentioned problems, and its main purpose is to suppress the external force applied to the container to an appropriate level to discharge the content liquid, prevent the content liquid discharged from the nozzle from becoming too thick, and improve the shearing property of the content liquid after discharge. Means of solving problems

[0007] In order to solve the above-mentioned problems, the present invention is a discharge cap, which is installed on the mouth of a container having elasticity, and discharges the content liquid as the pressure of the internal space of the container increases due to the external force applied to the container, and is characterized in that it has: a nozzle, which forms a nozzle flow path with a cross-sectional area smaller than the opening area of ​​the mouth; a valve, which is arranged on the nozzle and is made of an elastic material softer than the nozzle; the valve includes: a valve part, through which the content liquid in the nozzle flow path is discharged; a cylindrical retained part, which is retained by a retaining body on the nozzle; a cylindrical connecting part, which connects the valve part and the retained part; the valve part includes: a slit part, which is provided with a slit that opens and closes according to the difference between the atmospheric pressure and the pressure of the internal space of the container; an outer peripheral part connected to the connecting part; the slit part is more easily deformed by the pressure change in the internal space than the outer peripheral part, and when the content liquid is discharged, the slit part is deformed in the discharge direction of the content liquid, and after the content liquid is discharged, the slit part is deformed to the nozzle flow path side. Effects of the Invention

[0008] According to the present invention, the external force applied to the container for discharging the content liquid can be suppressed to an appropriate level, the content liquid discharged from the nozzle does not become too thick, and the shearing property of the content liquid after discharge can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 1 is a cross-sectional view showing a portion of the discharge cap and the container according to the first embodiment, showing a closed state with the cover body on. Figure 2 1 is a cross-sectional view showing a portion of the discharge cap and the container according to the first embodiment, and shows an open state in which the cover body is removed. Figure 3 yes Figure 1 Enlarged view of part A. Figure 4 (a) is a top view of the slit valve. Figure 4 (b) is along Figure 4 (a) is a cross-sectional view taken along line BB. Figure 5 (a) is a diagram showing a state in which the nozzle flow path is filled with the content liquid and no external force is applied to the container, Figure 5 (b) is a diagram showing a state in which the slit portion of the slit valve is expanded by the content liquid in the nozzle flow path, Figure 5 (c) is a diagram showing a state where the content liquid is discharged from the slit portion to the outside. Figure 6 (a) is a diagram showing a state in which the liquid content in the nozzle flow path begins to return to the container side when the external force on the container is released. Figure 6 (b) is a diagram showing a state where air starts to flow into the nozzle flow path. Figure 6 (c) is a diagram showing a state where the inflow of air into the nozzle flow path is completed and the slit valve is closed. Figure 7 (a) is a top view of a slit valve according to a first modification example, Figure 7 (b) is along Figure 7 (a) is a cross-sectional view taken along line CC. Figure 8 is a cross-sectional view of a slit valve according to a second modification. Fig. 9 is a cross-sectional view of a slit valve according to a third modification. Fig.10 is a cross-sectional view of a slit valve according to a fourth modification. Fig.11 is a cross-sectional view of a slit valve according to a fifth modification. Fig.12 is a cross-sectional view of a discharge cap according to a modified example of the first embodiment. Fig.13 (a) is a plan view showing an open state of a discharge cap according to a modified example of the first embodiment, Fig.13 (b) is along Fig.13 (a) is a cross-sectional view taken along line DD. Fig.14 It is a cross-sectional view showing a closed state in which the cover body of the discharge cap according to the second embodiment is covered. Fig.15 yes Fig.14 An enlarged view of part E is shown in FIG. Fig.16 is a cross-sectional view of a discharge cap according to a modified example of the second embodiment. DETAILED DESCRIPTION

[0010] <First embodiment> However, the components, types, combinations, shapes, relative configurations, etc. described in each embodiment do not limit the scope of the present invention to the subject matter thereof unless otherwise specified, but are merely simple illustrative examples. Figure 1 and Figure 2FIG. 2 is a cross-sectional view showing a portion of the discharge cap 1A and the container 3 according to the first embodiment. Figure 1 and 2 As shown, the discharge cap 1A according to the first embodiment has a nozzle 29 and is detachably mounted to the mouth 15 of the elastic container (squeeze container) 3. The internal space of the container 3 contains liquid (content liquid) CLq. The pressure of the internal space of the container 3 rises due to the external force applied to the container 3, so the discharge cap 1A discharges the content liquid CLq from the nozzle 29.

[0011] <Container 3> The container 3 is made of synthetic resin such as polyethylene (PE) and polyethylene terephthalate (PET), is easily deformed and has elasticity. When an external force is applied to the container 3 by pressing (extrusion) or the like, the container 3 is deformed to shrink the volume of the internal space, and when the external force is removed, the container 3 returns to its original shape due to its elasticity. The container 3 includes a body 13 for storing the content liquid CLq and a mouth 15 provided integrally with the body 13 and capable of taking the content liquid CLq in and out. The mouth 15 has an outer peripheral portion formed with an external thread 17 for attaching the discharge cap 1A. The shape of the main body 13 is not particularly limited as long as it shrinks the volume of the internal space when an external force is applied and returns to the original shape when the external force is removed. For example, the main body 13 can be formed in a bottomed cylindrical shape.

[0012] The content liquid CLq contained in the internal space of the container 3 is a viscous liquid such as a lubricant, a caulking agent, and honey. The viscosity of the lubricant is about 3100 mPa·s, and the viscosity of honey is about 12000 mPa·s. In the following description, the content liquid CLq is a liquid having a viscosity of, for example, 500 mPa·s to 12000 mPa·s.

[0013] <Discharge cap 1A according to first embodiment> The discharge cap 1A comprises: a cap body 5, which has a discharge nozzle 29 and can be detachably mounted on the mouth 15 of the container 3; a slit valve 7A (valve body) and a retaining body 9 (retaining portion), which are arranged at the front end of the discharge nozzle 29; and a cover body 11, which can be detachably mounted on the cap body 5 in a manner covering the discharge nozzle 29. The cap body 5 has a substantially disc-shaped top wall 21, a substantially cylindrical outer wall portion 23 extending from the inner surface of the top wall 21 toward the container 3, a cylindrical middle wall portion 25, and a cylindrical inner wall portion 27, and a substantially cylindrical discharge nozzle 29 extending from the center of the outer surface of the top wall 21 toward the side opposite to the container 3. In the present embodiment, the cap body 5 is formed of a hard synthetic resin that does not deform when discharging the content liquid CLq.

[0014] The cylindrical outer wall portion 23 extends from the outer edge of the top wall 21 to the vicinity of the main body portion 13. An annular extension portion 31 extending radially outward is formed on the outer wall surface of the end portion (the end portion on the side far from the top wall 21) of the cylindrical outer wall 23. The extension portion 31 is provided to support the opening edge of the cover body 11 mounted on the cap body 5. The cylindrical middle wall portion 25 is provided on the inner circumference of the cylindrical outer wall portion 23 concentrically with the cylindrical outer wall portion 23 at an appropriate interval. The end portion (the end portion on the side far from the top wall 21) of the cylindrical middle wall portion 25 extends to the vicinity of the bottom of the mouth portion 15. The inner wall surface of the cylindrical middle wall portion 25 is formed with an internal thread 33, and the external thread 17 of the mouth portion 15 is detachably fitted into the internal thread 33.

[0015] The cylindrical inner wall portion 27 is provided concentrically with the cylindrical intermediate wall portion 25 with a necessary interval therebetween so that the front end portion of the mouth portion 15 is fitted into the inner circumference of the cylindrical intermediate wall portion 25. Therefore, a space (groove) 35 is formed between the cylindrical intermediate wall portion 25 and the cylindrical inner wall portion 27 for inserting the mouth portion 15 of the container 3. The length of the cylindrical inner wall portion 27 is shorter than that of the cylindrical intermediate wall portion 25. A tapered portion whose diameter decreases as it moves away from the top wall 21 is provided on the outer peripheral surface of the cylindrical inner wall portion 27. When the mouth portion 15 is fitted into the cap body 5, the tapered portion guides the mouth portion 15. When the mouth portion 15 is fitted into the cap body 5, the outer peripheral surface of the top wall 21 side of the cylindrical inner wall portion 27 is in close contact with the inner peripheral surface of the mouth portion 15, thereby suppressing leakage of the content liquid CLq.

[0016] <Discharge nozzle 29> The discharge nozzle 29 is cylindrical in shape and extends from the base end on the top wall 21 side to the front end away from the top wall 21, and a nozzle flow path 29a through which the content liquid CLq flows is provided inside the discharge nozzle 29. In addition, an opening 43 is provided on the top wall 21 to connect the nozzle flow path 29a with the internal space of the container 3. Therefore, the content liquid CLq freely reciprocates between the internal space of the container 3 and the nozzle flow path 29a. Since the cross-sectional area SA29a of the nozzle flow path 29a is smaller than the opening area OP15 of the mouth 15, the thickness of the content liquid CLq discharged from the front end of the discharge nozzle 29 can be made thinner than the content liquid CLq directly flowing out from the mouth 15. In addition, since the discharge nozzle 29 has a predetermined length, it is easy to discharge the content liquid CLq to a desired location. In this embodiment, the discharge nozzle 29 has a cylindrical shape that tapers from the base end of the top wall 21 to the tip, but is not limited to this shape. For example, the cross-sectional shape of the nozzle flow path 29a may be constant from the base end to the tip of the discharge nozzle 29.

[0017] Figure 3 yes Figure 1 The enlarged view of section A is shown. Figure 2 and Figure 3 As shown, an annular protrusion 39 that protrudes radially inward is formed on the inner circumference of the front end portion of the discharge nozzle 29 . The inner peripheral surface of the protrusion 39 is a discharge opening 37, and the valve portion 49 and the thin-walled cylinder portion 51 of the slit valve 7A are arranged in the discharge opening 37. In addition, the inner surface of the protrusion 39 (an annular surface protruding radially inward in the nozzle flow path 29a) is a contact surface 38 that contacts the valve side wall portion 47 of the slit valve 7A to prevent the slit valve 7A from falling off.

[0018] An expanded diameter portion 45 that expands in diameter radially outward is formed on the outer peripheral surface of the front end portion of the discharge nozzle 29. The expanded diameter portion 45 is provided to detachably fix the cover body 11. like Figure 3 As shown, an annular recess 41 is formed on the inner peripheral surface of the discharge nozzle 29 at a position closer to the front end than the middle in the longitudinal direction of the discharge nozzle 29. The recess 41 is provided to prevent the holder 9 from falling off from the discharge nozzle 29.

[0019] <Slit valve 7A> Figure 4 (a) is a top view of the slit valve 7A, Figure 4 (b) is along Figure 4 (a) is a cross-sectional view taken along line BB. Figure 3 , Figure 4 (a) Figure 4 As shown in (b), the slit valve 7A has a cylindrical valve side wall portion 47 (retained portion), a roughly disc-shaped valve portion 49 for discharging the content liquid CLq in the nozzle flow path 29a, and a thin-walled cylindrical portion 51 (connecting portion) connecting the valve side wall portion 47 and the valve portion 49. The slit valve 7A is made of an elastic material softer than the discharge nozzle 29 (cap body 5). In the present embodiment, the slit valve 7A is integrally molded from a synthetic resin such as silicone having elasticity (hardness measured by a durometer type A) with a hardness of about A20° to about A50°. The slit valve 7A of the present embodiment is manufactured by integral molding, and therefore is easy to manufacture.

[0020] The valve side wall portion 47 is held by the retaining body 9 on the discharge nozzle 29. The front end surface 47a of the thin-walled cylinder portion 51 side of the valve side wall portion 47 (more specifically, the surface protruding radially outward from the thin-walled cylinder portion 51) abuts against the abutment surface 38 of the protrusion 39, thereby preventing the slit valve 7A from falling off from the discharge nozzle 29. Therefore, the thickness TH47 of the valve side wall portion 47 is set to a thickness required to prevent the valve side wall portion 47 from falling off from the discharge nozzle 29. In the present embodiment, the thickness TH47 of the valve side wall portion 47 is about 0.3 mm to about 1.0 mm. The thin-walled cylinder 51 connects the inner peripheral portion of the front end surface 47a side of the valve side wall portion 47 and the outer peripheral portion of the inner surface 54 side of the valve portion 49. Moreover, the outer diameter of the thin-walled cylinder 51 is substantially equal to the opening diameter of the discharge opening 37. Therefore, in a state where the slit valve 7A is held at the front end portion of the discharge nozzle 29, the outer peripheral surface of the thin-walled cylinder 51 abuts against the discharge opening 37. In other words, the thin-walled cylinder 51 is configured to fit into the discharge opening 37 of the discharge nozzle 29.

[0021] The thickness TH51 of the thin-walled tube portion 51 is sufficiently thinner than the thickness TH47 of the valve side wall portion 47. For example, the thickness TH51 of the thin-walled tube portion 51 is less than half (approximately 1 / 4 to 1 / 3) of the thickness TH47 of the valve side wall portion 47. In addition, the length L51 of the thin-walled tube portion 51 is approximately 0.3 mm to approximately 0.7 mm. Therefore, the area of ​​the front end surface 47a of the valve side wall portion 47 (in other words, the area of ​​the portion abutting against the abutment surface 38 of the discharge nozzle 29) can be ensured to be sufficient, and the slit valve 7A can be effectively prevented from falling off from the discharge nozzle 29.

[0022] Furthermore, the thin-walled tube portion 51 is more easily deformed than the valve-side wall portion 47. Since the thin-walled tube portion 51 is easily deformed, even if the valve-side wall portion 47 is deformed by the attachment of the slit valve 7A, the deformation of the valve-side wall portion 47 is absorbed. Specifically, Figure 3 As shown in FIG. 1 , the valve side wall portion 47 is sandwiched by the discharge nozzle 29 and the retaining body 9 from the outer peripheral side and the inner peripheral side. The slit valve 7A is mounted on the discharge nozzle 29 by, for example, relatively moving the retaining body 9 whose front end portion is covered by the slit valve 7A toward the front end of the discharge nozzle 29 through the inner cavity of the discharge nozzle 29 (i.e., the nozzle flow path 29a). Therefore, when the slit valve 7A is mounted, the valve side wall portion 47 may be deformed due to the friction between the inner peripheral surface of the discharge nozzle 29 and the outer peripheral surface of the retaining body 9. Even if the valve side wall portion 47 is deformed, the thin-walled cylindrical portion 51 itself is also deformed, so the valve portion 49 is not affected.

[0023] In addition, when discharging the content liquid CLq, the thin-walled tube portion 51 may be deformed. For example, when discharging a liquid CLq with a high viscosity such as a lubricant (viscosity: about 3100 mPa·s) or honey (viscosity: about 12000 mPa·s), the thin-walled tube portion 51 is extended when an external force in the discharge direction is applied to the valve portion 49, and contracts after the content liquid CLq is discharged. As described later, when the thin-walled tube portion 51 contracts, the outer peripheral portion 49a is pulled toward the nozzle flow path 29a side, thereby assisting the slit portion 49b to deform toward the nozzle flow path 29a side. As a result, the shutoff property of the content liquid CLq is improved after it is discharged.

[0024] <Valve part 49> The outer diameter of the valve portion 49 is substantially equal to the opening diameter of the discharge opening 37. Therefore, when the slit valve 7A is held at the front end of the discharge nozzle 29, the outer peripheral surface of the valve portion 49 contacts the discharge opening 37. In other words, the valve portion 49 is configured to fit into the discharge opening 37 of the discharge nozzle 29. In the present embodiment, the outer diameter Φ49 of the valve portion 49 is approximately 4 mm to approximately 7 mm. The outer surface 53 of the valve portion 49 is a spherically concave surface toward the nozzle flow path 29a side (the opposite side of the ejection direction of the content liquid CLq). On the other hand, the inner surface 54 of the valve portion 49 is a flat surface orthogonal to the central axis L of the cylinder of the valve side wall portion 47.

[0025] The valve portion 49 is formed with a slit 55 extending radially outward from the center point O. In the slit valve 7A, the slit 55 is in a cross shape. The slit 55 is configured to open and close according to the difference between the pressure in the internal space of the container 3 and the atmospheric pressure. In the present embodiment, the length L55 of the slit 55 is about 2 mm to about 5 mm. In addition, regarding the slits 55, the intersection angle between one slit and another slit is not limited to 90 degrees. For example, the intersection angle between one slit and another slit can be changed within a range of 60 degrees to 90 degrees. In addition, the length of one slit can also be different from the length of another slit.

[0026] The valve portion 49 includes an outer peripheral portion 49 a connected to the thin-walled cylindrical portion 51 , a slit portion 49 b provided with a slit 55 , and an intermediate portion 49 c provided between the slit portion 49 b and the outer peripheral portion 49 a . As described above, since the outer surface 53 of the valve portion 49 is a spherical concave surface and the inner surface 54 is a flat surface, the outer peripheral portion 49a, the middle portion 49c, and the slit portion 49b are formed so as to gradually become thinner as they go from the outer periphery of the valve portion 49 toward the center point O. Therefore, the middle portion 49c is formed so as to gradually become thinner as it goes from the outer peripheral portion 49a toward the slit portion 49b.

[0027] In the present embodiment, the thickness of the slit portion 49b is less than half the thickness of the outer peripheral portion 49a, and the slit portion 49b is provided closer to the nozzle flow path 29a than a middle position TC49 in the thickness direction of the outer peripheral portion 49a. For example, the maximum thickness TH49a of the outer peripheral portion 49a is about 0.6 mm to about 0.7 mm, and the maximum thickness TH49b of the slit portion 49b is about 0.3 mm to about 0.35 mm. In addition, the minimum thickness of the slit portion 49b at the center point O is about 0.15 mm to about 0.25 mm.

[0028] According to the above structure, when the content liquid CLq is discharged, due to the pressure change of the content liquid CLq (internal space of the container 3), the slit portion 49b is more easily deformed than the outer peripheral portion 49a, which helps to reduce the diameter of the front end side (downstream side) of the discharge nozzle 29. In addition, the outer peripheral portion 49a is thicker than the middle portion 49c and the slit portion 49b, and the middle portion 49c is thicker than the slit portion 49b. Therefore, after the content liquid CLq is discharged, the force (restoration force) that deforms the outer peripheral portion 49a in the return direction is greater than the force that deforms the middle portion 49c in the return direction, and the restoration force of the middle portion 49c is greater than the restoration force of the slit portion 49b. As a result, the slit portion 49b is rapidly deformed toward the nozzle flow path 29a side by the restoring forces from the outer peripheral portion 49a and the middle portion 49c in addition to its own restoring force, thereby improving the cutoff property of the content liquid CLq.

[0029] Furthermore, since the outer peripheral portion 49 a and the intermediate portion 49 c are thicker than the slit portion 49 b , both ends of the slit 55 can be made less likely to break. Furthermore, since the slit valve 7A is integrally molded of synthetic resin or the like, the flexibility of each of the portions 49 a , 49 b , 51 can be easily determined by determining the thicknesses TH49 a , TH49 b , TH51 of each of the portions 49 a , 49 b , 51 .

[0030] <Holding body 9> like Figure 3 As shown, the retainer 9 is a hollow cylinder fitted into the inner circumference of the front end side of the discharge nozzle 29, and is a substantially cylindrical member in this embodiment. The retainer 9 retains the valve side wall portion 47 together with the discharge nozzle 29 and prevents the slit valve 7A from falling off from the discharge nozzle 29. The holding body 9 includes a small diameter cylindrical portion 57 located at the front end side of the discharge nozzle 29, and a large diameter cylindrical portion 59 located at the base end side of the discharge nozzle 29 relative to the small diameter cylindrical portion 57. The base end of the small diameter cylindrical portion 57 is integrally connected to the front end of the large diameter cylindrical portion 59. The internal space 9a of the holding body 9 constitutes a part of the nozzle flow path 29a.

[0031] The outer diameter of the small diameter cylinder portion 57 is substantially the same as the inner diameter of the valve side wall portion 47. The outer diameter of the large diameter cylinder portion 59 is substantially the same as the inner diameter of the discharge nozzle 29. A flange portion 61 protruding radially outward is provided at a base end portion of the outer peripheral surface of the large-diameter cylindrical portion 59. The flange portion 61 is fitted into the annular recessed portion 41 of the discharge nozzle 29. The holding body 9 is positioned by fitting the flange portion 61 into the recessed portion 41 , and is fixed to the discharge nozzle 29 .

[0032] When the holder 9 is fixed to the discharge nozzle 29 , the valve side wall portion 47 of the slit valve 7A is arranged between the discharge nozzle 29 and the small-diameter cylindrical portion 57 . The front end surface 47a of the valve side wall portion 47 abuts against the abutment surface 38 of the protrusion 37, and the base end surface 47b of the valve side wall portion 47 abuts against the front end surface 60 of the large diameter cylinder portion 59 (the surface whose diameter increases radially outward from the small diameter cylinder portion 57). Thus, the valve side wall portion 47 is held in the space formed by the discharge nozzle 29 and the holder 9. As a result, the slit valve 7A is prevented from falling off from the discharge nozzle 29. In addition, the thin-walled cylinder portion 51 extends from the gap between the small-diameter cylinder portion 57 and the protrusion 37 toward the front end side of the discharge nozzle 29.

[0033] <Cover 11> like Figure 1 and Figure 3 As shown, the cover 11 is a bottomed cylindrical member having a cylindrical wall portion 65 and a disc-shaped top plate portion 67. A cylindrical locking portion 69 is protrudingly provided at the center of an inner surface 67a of the top plate portion 67. The front end of the discharge nozzle 29 is inserted into the inner space of the locking portion 69. The inner peripheral surface of the open end of the locking portion 69 is tapered to widen toward the open end. This taper is provided to guide the front end of the discharge nozzle 29. A contact portion 71 is provided on the inner circumferential side of the top plate portion 67 relative to the locking portion 69. The contact portion 71 is spherically protruding toward the open end of the locking portion 69. When the cover 11 is mounted on the cap body 5, the surface of the contact portion 71 contacts the outer surface 53 of the valve portion 49, thereby improving the sealing performance of the valve portion 49.

[0034] <Operation when discharging the content liquid CLq> Next, the operation when discharging the content liquid CLq will be described. Figure 5 (a) is a diagram showing a state 7A in which the nozzle flow path 29a is filled with the content liquid CLq and no external force is applied to the container 3. Figure 5 (b) is a diagram showing a state in which the slit portion 49b of the slit valve 7A is expanded by the content liquid CLq in the nozzle flow path 29a. Figure 5(c) is a diagram showing a state where the content liquid CLq is discharged from the slit portion 49b to the outside. Notice, Figure 5 (a) to 5(c) show the front end portion of the discharge nozzle 29. In these figures, the front end portion of the discharge nozzle 29 faces downward.

[0035] First, the action when external force is applied to the container 3 will be described. Figure 5 As shown in (a), when the nozzle flow path 29a is filled with the content liquid CLq and no external force is applied to the container 3, the slit portion 49b of the slit valve 7A is in a closed state. Therefore, since the slit valve 7A (valve portion 49) is in a closed state, the content liquid CLq in the nozzle flow path 29a stays in the nozzle flow path 29a.

[0036] like Figure 5 As shown in (b), when an external force is applied to the container 3 by squeezing or the like, the pressure of the internal space rises, and a force PR+ in the discharge direction is applied to the content liquid CLq in the nozzle flow path 29a. The force PR+ in the discharge direction is proportional to the difference between the pressure of the internal space of the container 3 and the atmospheric pressure. The force PR+ in the discharge direction is transmitted through the content liquid CLq and acts on the inner surface 54 of the valve portion 49. The slit portion 49b is deformed in the discharge direction by the content liquid CLq. Due to the deformation of the slit portion 49b, a gap (discharge port) is formed between the slits 55. Among them, the slit portion 49b is thinner than the outer peripheral portion 49a and the middle portion 49c, and thus deforms more than the outer peripheral portion 49a and the middle portion 49c. In addition, since the thickness of the middle portion 49c is thinner than the thickness of the outer peripheral portion 49a, it deforms more than the outer peripheral portion 49a. Therefore, the inner surface 54 of the valve portion 49 forms an inclined surface toward the discharge port, and smoothly guides the content liquid CLq.

[0037] Then, if Figure 5 As shown in (c), the content liquid CLq is continuously ejected from the gap (discharge port) between the slits 55. In this discharge cap 1A, the thickness of the slit portion 49b is thinner than the thickness of the outer peripheral portion 49a and the intermediate portion 49c. Therefore, the slit portion 49b deforms more greatly than the outer peripheral portion 49a and the intermediate portion 49c in response to the pressure change of the content liquid CLq (pressure change of the internal space of the container 3). As a result, the content liquid CLq can be discharged from the discharge nozzle 29 without excessively increasing the external force applied to the container 3. In addition, since the thickness of the content liquid CLq discharged from the discharge nozzle 29 can be limited by the size of the slit portion 49b (slit 55), the problem of the content liquid CLq becoming too thick can be suppressed.

[0038] Next, the operation when the content liquid CLq is sucked into the discharge nozzle 29 will be described. Figure 6 (a) is a diagram showing a state in which the content liquid CLq in the nozzle flow path 29a begins to return to the container 3 side when the external force on the container 3 is released. Figure 6 (b) is a diagram showing a state where the air AR starts to flow into the nozzle flow path 29a. Figure 6 (c) is a diagram showing a state in which the inflow of the air AR into the nozzle flow path 29a is completed and the slit valve 7A is closed. In addition, even in Figure 6 (a)~ Figure 6 (c) also Figure 5 (a)~ Figure 5 (c) Similarly, the front end of the discharge nozzle 29 faces downward.

[0039] like Figure 6 As shown in (a), after the content liquid CLq is discharged, when the external force acting on the container 3 is released, a force PR- (hereinafter referred to as the force PR- in the return direction) is applied to the content liquid CLq in the nozzle flow path 29a to return to the container 3. The force PR- in the return direction is generated because the container 3 in the contracted state tries to expand to its original shape due to its own elasticity. In addition, the outer peripheral portion 49a, the middle portion 49c and the slit portion 49b will also return to their original shapes due to their own elasticity. Among them, the outer peripheral portion 49a has a greater thickness than the middle portion 49c and the slit portion 49b, and therefore has a stronger restoring force than the middle portion 49c and the slit portion 49b. Similarly, the middle portion 49c has a stronger restoring force than the slit portion 49b. As a result, after the content liquid CLq is discharged, the slit portion 49b is rapidly deformed toward the nozzle flow path 29a side by receiving the restoring force of the outer peripheral portion 49a and the intermediate portion 49c in addition to its own restoring force.

[0040] like Figure 6 As shown in (b), after the content liquid CLq passes through the valve portion 49, air AR to supplement the amount of the discharged content liquid CLq flows into the nozzle flow path 29a. When the air AR flows in, the slit portion 49b deforms toward the nozzle flow path 29a, and a gap is formed between the slits 55. The thickness of the slit portion 49b is smaller than the thickness of the outer peripheral portion 49a and the middle portion 49c. Therefore, the slit portion 49b is deformed more than the outer peripheral portion 49a and the middle portion 49c. The deformation of the slit portion 49b can make the gap between the slits 55 sufficiently large, and the air AR can be effectively introduced into the nozzle flow path 29a. In addition, the thin-walled cylinder 51 formed into a thin wall can be tilted in the inner peripheral direction of the thin-walled cylinder 51. For example, if the amount of air AR sucked into the nozzle flow path 29a is large enough, or the suction speed of the air AR is high enough, or the viscosity of the content liquid CLq is high, the thin-walled cylinder 51 can be tilted in the inner peripheral direction. When the thin-walled cylinder 51 is tilted, the slit portion 49b is greatly tilted toward the nozzle flow path 29a side by the tilt amount of the thin-walled cylinder 51. Therefore, the gap between the slits 55 becomes larger than when the slits 55 are not tilted. As a result, even by the tilt of the thin-walled cylinder 51, the air AR can be effectively introduced into the nozzle flow path 29a.

[0041] Afterwards, if Figure 6 As shown in (c), as the container 3 returns to its original shape, the return force PR- acting on the content liquid CLq disappears. When the return force PR- disappears, the slit portion 49b of the slit valve 7A is closed. Therefore, since the slit valve 7A (valve portion 49) is in a closed state, the content liquid CLq in the nozzle flow path 29a stays in the nozzle flow path 29a.

[0042] As can be seen from the above description, the slit portion 49b is deformed according to the pressure change of the content liquid CLq (pressure change of the internal space of the container 3). Therefore, the gap between the slits 55 can be made sufficiently large by the force PR- in the return direction. Thus, the required size for efficiently sucking the content liquid CLq and the air AR into the nozzle flow path 29a can be formed, and the cutoff property of the content liquid CLq can be improved. In the slit valve 7A, since the outer peripheral portion 49a can be made sufficiently thick, the restoring force of the outer peripheral portion 49a after the content liquid CLq is discharged can be increased. Similarly, the restoring force of the intermediate portion 49c can be increased compared to the slit portion 49b.

[0043] In addition, when the content liquid CLq is discharged, the force PR+ in the discharge direction received by the valve portion 49 (especially the inner surface 54 of the valve portion 49) increases as the viscosity of the content liquid CLq increases. Since the thin-walled cylinder portion 51 is thinner than the outer peripheral portion 49a of the valve portion 49 and is easily deformed, Figure 5 As shown by the arrow in (b), the thin-walled tube portion 51 may expand in the discharge direction due to the force PR+ in the discharge direction received by the outer peripheral portion 49a. When the external force applied to the container 3 is released while the thin-walled cylindrical portion 51 remains stretched, Figure 6 As shown by the arrow in (a), the thin-walled tube 51 begins to contract in the return direction due to its own elasticity. The contraction of the thin-walled tube 51 pulls the outer peripheral portion 49a toward the container 3. After the content liquid CLq is discharged, the contraction force of the thin-walled tube 51 helps the slit portion 49b to deform toward the nozzle flow path 29a. In this way, even by the expansion and contraction of the thin-walled tube portion 51 , it is possible to further improve the cutoff property of the content liquid CLq.

[0044] Furthermore, the discharge nozzle 29 of the discharge cap 1A is cylindrical and gradually becomes thinner from the base end (upstream side) to the front end (downstream side), so that the content liquid CLq can be easily discharged to a deep part. As a result, the content liquid CLq can be easily discharged to various parts.

[0045] <Modification of slit valve> Hereinafter, modified examples of the slit valve will be described. Figure 7 (a) is a top view of a slit valve 7B according to a first modification example, Figure 7 (b) is along Figure 7 (a) is a cross-sectional view taken along line CC, Figure 8 is a cross-sectional view of a slit valve 7C according to a second modification example, Fig. 9 is a cross-sectional view of a slit valve 7D according to a third modification example, Fig.10 is a cross-sectional view of a slit valve 7E according to a fourth modification example, Fig.11 It is a cross-sectional view of a slit valve 7F according to a fifth modification.

[0046] <Slit valve 7B according to first modified example> In accordance with Figure 7 (a) and Figure 7 The slit valve 7B of the first modified example shown in (b) is characterized in that the slit 55B is in a straight line shape, in other words, the slit 55B is formed by a single linear slit. The slit valve 7B is different from the above-mentioned slit valve 7A in that the slit 55B is formed by one linear slit, but the other structures are the same as those of the slit valve 7A. Therefore, even if the slit valve 7B is used in the discharge cap 1A, the slit portion 49b is deformed according to the pressure change of the content liquid CLq, so the external force applied to the container 3 to discharge the content liquid CLq can be suppressed to an appropriate size, and the content liquid CLq discharged from the discharge nozzle 29 does not become too thick.

[0047] In the slit valve 7B, the thickness of the slit portion 49b is less than half the thickness of the outer peripheral portion 49a, and the slit portion 49b is provided closer to the nozzle flow path 29a than the middle position TC49 in the thickness direction of the outer peripheral portion 49a. Therefore, even when the slit valve 7B is used in the discharge cap 1A, it is possible to increase the restoring force of the outer peripheral portion 49 a after the content liquid CLq is discharged. According to the above structure, after the content liquid CLq is discharged, the slit portion 49b is quickly deformed toward the nozzle flow path 29a side. As a result, the cutoff property of the content liquid CLq can be improved. In addition, in the slit valve 7B, when the viscosity of the content liquid CLq is sufficiently high, the outer peripheral portion 49a is pulled toward the container 3 side by the contraction of the thin-walled cylindrical portion 51, thereby also improving the cutoff property of the content liquid CLq.

[0048] <Slit valve 7C according to second modified example> In accordance with Figure 8 The slit valve 7C of the second modified example shown is characterized in that an outer surface 53C of the valve portion 49 is a flat surface, and an inner surface 54C is a concave surface that is spherically recessed toward the discharge direction of the content liquid CLq. Even if the slit valve 7C is used in the discharge cap 1A, the slit portion 49b is deformed according to the pressure change of the content liquid CLq, so the external force applied to the container 3 to discharge the content liquid CLq can be suppressed to an appropriate level, and the content liquid CLq discharged from the discharge nozzle 29 does not become too thick. In addition, after the content liquid CLq is discharged, the outer peripheral portion 49a and the middle portion 49c rapidly deform the slit portion 49b toward the nozzle flow path 29a side. As a result, the cut-off property of the content liquid CLq can be improved. In addition, when the viscosity of the content liquid CLq is sufficiently high, the cut-off property of the content liquid CLq can be improved by the expansion and contraction of the thin-walled tube portion 51.

[0049] <Slit valve 7D according to third modified example> In accordance with Fig. 9 The slit valve 7D according to the third modified example shown is characterized in that an outer surface 53D and an inner surface 54D of the valve portion 49 are respectively concave surfaces that are concave in a spherical shape. Even if the slit valve 7D is used in the discharge cap 1A, the slit portion 49b is deformed according to the pressure change of the content liquid CLq, so the external force applied to the container 3 to discharge the content liquid CLq can be suppressed to an appropriate level, and the content liquid CLq discharged from the discharge nozzle 29 does not become too thick. In addition, after the content liquid CLq is discharged, the outer peripheral portion 49a and the middle portion 49c rapidly deform the slit portion 49b toward the nozzle flow path 29a side. As a result, the cut-off property of the content liquid CLq can be improved. In addition, when the viscosity of the content liquid CLq is sufficiently high, the cut-off property of the content liquid CLq can be improved by the expansion and contraction of the thin-walled tube portion 51.

[0050] <Slit valve 7E according to fourth modified example> In accordance with Fig.10The slit valve 7E of the fourth variant shown is characterized in that the thickness of the middle portion 49c of the valve portion 49 gradually becomes thinner as it approaches the center of the valve portion 49, and the slit portion 49b is arranged at a position closer to the nozzle flow path 29a side than the middle position TC49 in the thickness direction of the outer peripheral portion 49a. Even if the slit valve 7E is used in the discharge cap 1A, the slit portion 49b is deformed according to the pressure change of the content liquid CLq, so the external force applied to the container 3 to discharge the content liquid CLq can be suppressed to an appropriate level, and the content liquid CLq discharged from the discharge nozzle 29 does not become too thick. In addition, the thickness of the slit portion 49b is less than half the thickness of the outer peripheral portion 49a, and the slit portion 49b is provided closer to the nozzle flow path 29a side than the intermediate position TC49. Therefore, after the content liquid CLq is discharged, the slit portion 49b is quickly deformed toward the nozzle flow path 29a side. As a result, after the content liquid CLq is discharged, the cutoff property of the content liquid CLq can be improved.

[0051] <Slit valve 7F according to fifth modified example> In accordance with Fig.11 In the slit valve 7F of the fifth variant shown, it is characterized in that the portion of the outer surface 53F of the valve portion 49 corresponding to the middle portion 49c and the portion of the inner surface 54F corresponding to the middle portion 49c are conical surfaces inclined toward the slit portion 49b, and the slit portion 49b is arranged at a position closer to the nozzle flow path 29a side than the middle position TC49 in the thickness direction of the outer peripheral portion 49a. Even if the slit valve 7F is used in the discharge cap 1A, the slit portion 49b is deformed according to the pressure change of the content liquid CLq, so the external force applied to the container 3 to discharge the content liquid CLq can be suppressed to an appropriate level, and the content liquid CLq discharged from the discharge nozzle 29 does not become too thick. In addition, the thickness of the slit portion 49b is less than half the thickness of the outer peripheral portion 49a, and the slit portion 49b is provided closer to the nozzle flow path 29a side than the intermediate position TC49. Therefore, after the content liquid CLq is discharged, the slit portion 49b is quickly deformed toward the nozzle flow path 29a side. As a result, after the content liquid CLq is discharged, the cutoff property of the content liquid CLq can be improved.

[0052] <Discharge cap 1B according to a modified example of the first embodiment> Fig.12 is a cross-sectional view of a discharge cap 1B according to a modified example of the first embodiment, Fig.13 (a) is a plan view showing an open state of a discharge cap 1B according to a modification of the first embodiment, Fig.13 (b) is along Fig.13 (a) is a cross-sectional view taken along line DD. like Fig.12 , Fig.13 (a) and Fig.13 (b) shows a discharge cap 1B according to a modification of the first embodiment, wherein the discharge nozzle 29 is shorter than that of the discharge cap 1A of the first embodiment. The same reference numerals are used for the same structures as those of the discharge cap 1A of the first embodiment, and their description is omitted.

[0053] The cover 11 is attached to the cap body 5 of the discharge cap 1B via the hinge 75. The protrusion 79 is provided on the side of the cover 11 opposite to the hinge 75. In addition, a recess 77 is provided on the side of the cap body 5 opposite to the hinge 75. The protrusion 79 is provided to close the cover 11 when the cover 11 is closed on the cap body 5 (see Fig.12 ) is provided to hook the user's finger or nail. The recess 77 is provided to make it easier for the user's finger etc. to hang on the protrusion 79.

[0054] Thus, even in the discharge cap 1B of the modified example having the short discharge nozzle 29, the content liquid CLq can be discharged from the discharge nozzle 29 without excessively increasing the external force applied to the container 3. In addition, even in the discharge cap 1B, the diameter of the front end portion of the discharge nozzle 29 can be reduced, and a small amount of content liquid CLq can be discharged.

[0055] <Discharge cap 1C according to second embodiment> Fig.14 is a cross-sectional view showing a closed state in which the discharge cap 1C according to the second embodiment is covered by the cover body 11, Fig.15 yes Fig.14 An enlarged view of part E is shown. like Fig.14 and Fig.15 As shown, the discharge cap 1C according to the second embodiment is characterized in that, compared with the discharge cap 1A according to the first embodiment, a retainer 9C is attached to the outer peripheral surface of the front end portion of the discharge nozzle 29C. In addition, the same reference numerals are attached to the same structures as the discharge cap 1A of the first embodiment, and their description is omitted.

[0056] The discharge nozzle 29C has, in order from the top wall 21 side to the front end side: a large diameter cylindrical wall 81 with the largest diameter, a middle diameter cylindrical wall 83 with a smaller diameter than the large diameter cylindrical wall 81, and a small diameter cylindrical wall 85 with a smaller diameter than the middle diameter cylindrical wall 83. In the present embodiment, the large diameter cylindrical wall 81 is the longest and occupies about 4 / 3 of the length of the discharge nozzle 29C. Moreover, the middle diameter cylindrical wall 83 is the second longest, and the small diameter cylindrical wall 85 is the shortest. Therefore, it can be said that the outer diameter of the discharge nozzle 29C is gradually reduced at the front end side portion. The outer diameter of the small diameter cylindrical wall 85 is substantially the same as the inner diameter of the valve side wall portion 47 of the slit valve 7A. An annular protrusion 87 is formed on the outer peripheral surface of the medium diameter cylindrical wall 83. The protrusion 87 is provided to prevent the retainer 9C from falling off.

[0057] The retaining body 9C is a substantially cylindrical member, and the inner diameter of the retaining body 9C is substantially the same as the outer diameter of the middle diameter cylindrical wall 83 except for the front end portion. In the present embodiment, the outer diameter of the middle diameter cylindrical wall 83 is substantially the same as the outer diameter of the cylindrical valve side wall portion 47 of the slit valve 7. The retaining body 9C is fitted with the middle diameter cylindrical wall 83 of the discharge nozzle 29C. In the state where the retaining body 9C is fitted, the small diameter cylindrical wall 85 is arranged in the internal space of the retaining body 9C. An annular protrusion 89 protruding radially inward is formed on the inner peripheral side of the front end of the retainer 9C. The purpose of the protrusion 89 is the same as that of the protrusion 39 of the discharge cap 1A of the first embodiment. An enlarged diameter portion 93 is provided on the outer peripheral surface of the front end of the retainer 9C to engage with the locking portion 69 of the cap 11. An annular recess 91 is formed on the inner peripheral surface of the holder 9C near the base end. The recess 91 fits with the protrusion 87 provided on the outer peripheral surface of the middle diameter cylindrical wall 83 to prevent the holder 9C from falling off from the discharge nozzle 29C.

[0058] Through the above structure, in the discharge cap 1C, by installing the retaining body 9C on the discharge nozzle 29C, the cylindrical valve side wall portion 47 of the slit valve 7A is retained between the inner peripheral surface of the retaining body 9C and the outer peripheral surface of the small diameter cylindrical wall 85 of the discharge nozzle 29C, and the valve portion 49 is retained on the inner peripheral portion of the annular protrusion 89. The discharge cap 1C according to the second embodiment also has the same operational effects as those of the discharge cap 1A according to the first embodiment.

[0059] <Discharge cap 1D according to a modified example of the second embodiment> Fig.16 1 is a cross-sectional view of a discharge cap 1D according to a modified example of the second embodiment. Fig.16 As shown, the discharge cap 1D according to the modified example of the second embodiment is different from the discharge cap 1B according to the modified example of the first embodiment (see Fig.12 Note that the same structures as the discharge cap 1B according to the modification of the first embodiment and the discharge cap 1C according to the second embodiment are given the same reference numerals, and description thereof will be omitted. The discharge cap 1D according to the modified example of the second embodiment also has the same operational effects as those of the discharge cap 1A according to the first embodiment.

[0060] <Other Modifications> Although the discharge caps 1A and 1C described above adopt a structure in which the cover body 11 is fitted into the cap body 5, they are not limited to this structure. For example, an external thread may be formed on the outer peripheral surface of the cylindrical outer wall portion 23 of the cap body 5, and an internal thread may be formed on the inner peripheral surface of the cylindrical wall portion 65 of the cover body 11. In addition, although the discharge caps 1B and 1D described above adopt a structure in which the cover 11 and the cap body 5 are connected by the hinge 75, the present invention is not limited to this structure. For example, the cover 11 and the cap body 5 may be fitted into the cover 11 without being connected. In the above-described discharge caps 1A, 1B, 1C, and 1D, the lengths of the discharge nozzles 29 and 29A can be appropriately determined.

[0061] [Summary of Embodiment Examples, Functions, and Effects of the Present Invention] <First embodiment> The present embodiment is a discharge cap 1A, 1B, 1C, 1D, which is installed at the mouth of the container 3 having elasticity, and discharges the content liquid CLq as the pressure of the internal space of the container 3 increases due to the external force applied to the container 3, and is characterized by having: a discharge nozzle 29, 29C, forming a nozzle flow path 29a with a cross-sectional area SA29a smaller than the opening area OP15 of the mouth 15; a slit valve 7A, 7B, 7C, 7D, 7E, 7F, which is provided at the discharge nozzle 29, 29C and is made of an elastic material softer than the discharge nozzle 29, 29C; the slit valve 7A, 7B, 7C, 7D, 7E, 7F includes: a valve portion 49 for supplying the content liquid CLq in the nozzle flow path 29a Discharge; a cylindrical valve side wall portion 47 (held portion) is held on the discharge nozzle 29, 29C by a retaining body 9, 9C; a cylindrical thin-walled cylinder portion 51 (connecting portion) connects the valve portion 49 and the valve side wall portion 47; the valve portion 49 includes: a slit portion 49b, which is provided with a slit 55, 55B which opens and closes according to the difference between the atmospheric pressure and the pressure of the internal space of the container 3; an outer peripheral portion 49a, which is connected to the thin-walled cylinder portion 51; the slit portion 49b is more easily deformed by the pressure change in the internal space than the outer peripheral portion 49a, and when the content liquid CLq is discharged, the slit portion 49b is deformed in the discharge direction of the content liquid CLq, and after the content liquid CLq is discharged, the slit portion 49b is deformed toward the nozzle flow path 29a side.

[0062] According to the discharge caps 1A, 1B, 1C and 1D of the present embodiment, the slit portion 49b is deformed due to the pressure change in the internal space, and the slits 55 and 55B are opened to form the CLq discharge port of the content liquid. The slit portion 49b is more easily deformed than the peripheral portion 49a, so the external force applied to the container 3 to discharge the content liquid CLq can be suppressed to an appropriate level, and the disadvantage that the content liquid CLq discharged from the discharge nozzles 29, 29C becomes too thick is suppressed. In addition, since the peripheral portion 49a is less likely to deform than the slit portion 49b, the restoring force after deformation is greater than that of the slit portion 49b. Therefore, the restoring force of the peripheral portion 49a after the content liquid CLq is discharged can be increased. The restoring force of the peripheral portion 49a assists the restoring force of the slit portion 49b to return to the closed state. As a result, the cutoff property of the discharged content liquid CLq can be improved.

[0063] <Second embodiment> In the discharge caps 1A, 1B, 1C and 1D according to the present embodiment, it is characterized in that the slit portion 49b of the slit valves 7A, 7B, 7C, 7D, 7E and 7F is integrally formed from the same elastic material as the outer peripheral portion 49a, and the thickness TH49b of the slit portion 49b and the thickness TH51 of the thin-walled cylinder portion 51 are thinner than the thickness TH49a of the outer peripheral portion 49a. According to the discharge caps 1A, 1B, 1C, and 1D of the present embodiment, the slit valves 7A, 7B, 7C, 7D, 7E, and 7F can be easily manufactured, and the softness can be managed by the thicknesses TH49a and TH49b of the portions 49a and 49b.

[0064] <Third Embodiment> In the discharge caps 1A, 1B, 1C and 1D according to the present embodiment, it is characterized in that the valve portion 49 of the slit valve 7A, 7B, 7C, 7D, 7E and 7F has an intermediate portion 49c between the slit portion 49b and the peripheral portion 49a, and the intermediate portion 49c gradually becomes thinner as it moves from the peripheral portion 49a toward the slit portion 49b. According to the discharge caps 1A, 1B, 1C, and 1D of the present embodiment, after the content liquid CLq is discharged, the outer peripheral portion 49a has a greater restoring force than the middle portion 49c, and the middle portion 49c has a greater restoring force than the slit portion 49b. As a result, the slit portion 49b is rapidly deformed toward the nozzle flow path 29a side by restoring forces from the outer peripheral portion 49a and the middle portion 49c in addition to its own restoring force, thereby improving the shutoff performance of the content liquid CLq.

[0065] <Fourth embodiment> In the discharge caps 1A, 1B, 1C and 1D according to the present embodiment, the valve portion 49 of the slit valves 7A and 7B is characterized in that the valve portion 49 has an outer surface 53 and an inner surface 54, wherein the outer surface 53 is a spherical concave surface recessed toward the nozzle flow path 29a side and the inner surface 54 is a flat surface. According to the discharge caps 1A, 1B, 1C, and 1D of the present embodiment, the deformation amount of the outer peripheral portion 49a caused by the pressure of the content liquid CLq applied to the inner surface 54 of the outer peripheral portion 49a can be increased. As a result, after the content liquid CLq is discharged, the force that deforms the outer peripheral portion 49a in the return direction can be increased, and the slit portion 49b can be quickly deformed toward the nozzle flow path 29a side. As a result, the shutoff property of the content liquid CLq can be improved.

[0066] <Fifth Embodiment> In the discharge caps 1A, 1B, 1C and 1D according to the present embodiment, it is characterized in that the thickness of the slit portion 49b of the valve portion 49 of the slit valves 7A, 7B, 7E and 7F is less than half the thickness of the peripheral portion 49a, and the slit portion 49b is arranged at a position closer to the nozzle flow path 29a side than the middle position TC49 in the thickness direction of the peripheral portion 49a. According to the discharge caps 1A, 1B, 1C, and 1D of the present embodiment, the slit portion 49b is provided on the nozzle flow path 29a side relative to the intermediate position TC49, so that the deformation amount when discharging the content liquid CLq can be increased compared to the structure provided on the discharge side relative to the intermediate position TC49. Therefore, the restoring force of the slit portion 49b after discharging the content liquid CLq is increased. As a result, the slit portion 49b can be deformed quickly toward the nozzle flow path 29a side, and the cutoff property of the content liquid CLq can be improved.

[0067] <Sixth embodiment> In the discharge caps 1A, 1B, 1C and 1D according to the present embodiment, it is characterized in that the thin-walled cylinder portion 51 (connecting portion) of the slit valves 7A, 7B, 7C, 7D, 7E and 7F is more easily deformed than the outer peripheral portion 49a due to the pressure change in the internal space of the container 3, and when the content liquid CLq is discharged, the thin-walled cylinder portion 51 extends in the discharge direction, and after the content liquid CLq is discharged, the thin-walled cylinder portion 51 contracts in the return direction. According to the discharge caps 1A, 1B, 1C, and 1D of the present embodiment, after the content liquid CLq is discharged, the outer peripheral portion 49a can be pulled toward the nozzle flow path 29a by the contraction force of the thin-walled tube portion 51, so that the slit portion 49b can be quickly deformed toward the nozzle flow path 29a. As a result, the shutoff property of the content liquid CLq can be improved.

[0068] <Seventh embodiment> In the discharge caps 1A, 1B, 1C and 1D according to the present embodiment, it is characterized in that the thin-walled cylinder portion 51 (connecting portion) of the slit valves 7A, 7B7C, 7D, 7E and 7F is more easily deformed than the outer peripheral portion 49a due to changes in the internal space pressure of the container 3, and after the content liquid CLq is discharged, the thin-walled cylinder portion 51 tilts toward the inner peripheral direction of the thin-walled cylinder portion 51. According to the discharge caps 1A, 1B, 1C, and 1D of the present embodiment, the gap between the slits 55 can be increased after the content liquid CLq is discharged, and the air AR can be efficiently taken into the nozzle flow path 29a. Description of Reference Numerals

[0069] 1A: discharge cap according to the first embodiment; 1B: discharge cap according to the modified example of the first embodiment; 1C: discharge cap according to the second embodiment; 1D: discharge cap according to the modified example of the second embodiment; 3: container; 5: cap body; 7A: slit valve; 7B: slit valve according to the first modified example; 7C: slit valve according to the second modified example; 7D: slit valve according to the third modified example; 7E: slit valve according to the fourth modified example; 7F: slit valve according to the fifth modified example; 9: retaining body; 9C: retaining body; 9a: internal space of the retaining body; 11: cover body; 13: main body; 15: mouth; 17: external thread; 21: top wall; 2 3: cylindrical outer wall; 25: cylindrical middle wall; 27: cylindrical inner wall; 29: discharge nozzle; 29C: discharge nozzle; 29a: nozzle flow path; 31: extension; 33: internal thread; 35: space (groove); 37: discharge opening; 38: abutment surface; 39: protrusion; 41: recess; 43: opening; 45: enlarged diameter portion; 47: valve side wall; 47a: front end surface of valve side wall; 49: valve; 49a: outer peripheral portion of valve; 49b: slit portion of valve; 49c: middle portion of valve; 51: thin-walled cylinder; 53: outer surface of valve; 53C: outer surface of valve; 53D: outer surface of valve; 54: Inner surface of valve portion; 54C: Inner surface of valve portion; 54D: Inner surface of valve portion; 55: Cross-shaped slit; 55B: I-shaped slit; 57: Small-diameter cylinder portion of retaining body; 59: Large-diameter cylinder portion of retaining body; 60: Front end surface of large-diameter cylinder portion; 61: Flange portion of retaining body; 65: Cylindrical wall portion of cover body; 67: Top plate portion of cover body; 67a: Inner surface of top plate portion; 69: Stopper portion of cover body; 71: Abutment portion of cover body; 75: Hinge; 77: Concave portion of cap body; 79: Protrusion of cover body; 81: Large-diameter cylindrical wall of discharge nozzle; 83: Medium-diameter cylindrical wall of discharge nozzle; 85: Small-diameter cylindrical wall of discharge nozzle; 87: Protrusion of the medium-diameter cylindrical wall; 89: protrusion of the retaining body; 91: recess of the retaining body; CLq: content liquid; OP15: opening area of ​​the mouth; SA29a: cross-sectional area of ​​the nozzle flow path; TH47: thickness of the valve side wall; Φ49: outer diameter of the valve part; TC49: middle position in the thickness direction of the outer periphery; TH49a: maximum thickness of the outer periphery; TH49b: maximum thickness of the slit part; TH51: thickness of the thin-walled cylinder; L51: length of the thin-walled cylinder; L55: length of the slit; ○: center point of the valve part; L: center axis of the valve side wall; PR+: force in the discharge direction; PR-: force in the return direction; AR: air.

Claims

1. A discharge cap, which is mounted on the mouth of an elastic container and discharges the content liquid as the pressure of the internal space of the container increases due to the external force applied to the container, characterized in that: have: a nozzle forming a nozzle flow path having a cross-sectional area smaller than an opening area of ​​the mouth; a valve, disposed at the nozzle and made of an elastic material softer than the nozzle; The valve comprises: a valve portion for discharging the content liquid in the nozzle flow path; a cylindrical held portion held by a holding body on the nozzle; and a connecting portion for connecting the valve portion and the held portion; The valve portion comprises: a slit portion provided with a slit that opens and closes according to the difference between the atmospheric pressure and the pressure of the internal space of the container; and an outer peripheral portion connected to the connecting portion; The slit portion is more easily deformed by pressure changes in the internal space than the outer peripheral portion, and when the content liquid is discharged, the slit portion is deformed in a discharge direction of the content liquid, and after the content liquid is discharged, the slit portion is deformed toward the nozzle flow path side.

2. The discharge cap according to claim 1, characterized in that: The slit portion is integrally formed of the same elastic material as the outer peripheral portion and is thinner than the outer peripheral portion.

3. The discharge cap according to claim 2, characterized in that: The valve portion has an intermediate portion between the slit portion and the outer peripheral portion, The intermediate portion gradually becomes thinner as it goes from the outer peripheral portion toward the slit portion.

4. The discharge cap according to claim 3, characterized in that: The valve portion has an outer surface and an inner surface, the outer surface is a spherical concave surface recessed toward the nozzle flow path side, and the inner surface is a flat surface.

5. The discharge cap according to claim 1, characterized in that: The thickness of the slit portion is less than half of the thickness of the outer peripheral portion, The slit portion is provided at a position closer to the nozzle flow path than a middle position in the thickness direction of the outer peripheral portion.

6. The discharge cap according to claim 1, characterized in that: The connection portion is more easily deformed by pressure changes in the internal space than the outer peripheral portion, and when the content liquid is discharged, the connection portion is extended in the discharge direction, and after the content liquid is discharged, the connection portion is contracted in the return direction.

7. The discharge cap according to claim 1, characterized in that: The connection portion is more easily deformed by a pressure change in the internal space than the outer peripheral portion, and after the content liquid is discharged, the connection portion is inclined toward an inner peripheral direction of the connection portion.

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