JP6887721B2 - Double container cap - Google Patents

Description

The present invention relates to a double container cap that is attached to the mouth of a double container and allows the contents to be poured out, and is particularly suitable for pouring out the contents containing a solid substance.

Conventionally, the container body has a configuration in which a discharge cap having a discharge port is attached to the mouth of the container body for storing the contents, and the contents stored in the container body are stored by pressing (squeezing) the body of the container body. There is known a discharge container capable of discharging a desired amount of an object from a discharge port.

Further, as such a discharge container, one having a configuration in which a check valve is provided to allow the contents to be discharged from the container body through the discharge port while to prevent the contents and the outside air from flowing into the container body. Are known.

For example, in Patent Document 1, the container body is configured as a double container containing a volume-reducing and deformable inner layer inside the outer layer, and between the discharge cap (cap body) and the inner plug (supporting inner plug). Describes a discharge container having a structure in which a check valve (discharge valve) having a slit valve structure is provided.

In a discharge container having such a configuration, when the body of the container body is pressed to discharge the contents and then the pressure on the body is released, the contents and the outside air directed from the discharge port to the container body by the check valve. In addition to blocking the inflow of air, the outside air can be introduced between the outer layer and the inner layer through the intake hole provided in the discharge cap to restore the outer layer to its original shape while reducing the volume of the inner layer. Therefore, the contents can be discharged without being replaced with the outside air, thereby making it difficult for the contents remaining inside the container body to come into contact with the air, and its deterioration and deterioration can be suppressed.

Japanese Unexamined Patent Publication No. 2013-95455

By the way, the above-mentioned discharge container is often used for storing liquid contents such as soy sauce and cosmetics, but for example, contents containing a small amount of solids such as sauce and miso, and contents such as miso, etc. There is also a desire to use it for the purpose of accommodating the contents containing ingredients.

However, since the conventional discharge container constitutes a check valve with a single slit valve structure, when the contents are discharged, the solid matter contained in the contents is caught in the slits constituting the slit valve. There is a risk that the slit valve will not close. If the slit remains open after discharge in this way, the outside air may invade the accommodation space side of the contents, leading to deterioration or deterioration of the contents.

An object of the present invention is to solve such a problem, and an object of the present invention is to suppress the invasion of outside air into a storage space even if a content containing a small amount of solid matter is contained. The purpose is to provide a cap for a double container that can be used.

The present invention is a double container cap to be attached to a double container body including an inner layer body for accommodating the contents and a squeezeable outer layer body for accommodating the inner layer body.
A cap body having a pouring hole for pouring out the contents from the inner layer and attached to the mouth of the double container body, and a cap body.
It is provided in the flow path between the inner layer body and the injection hole to block the outflow of the contents from the inner layer body in the closed state, while it is opened by the pressure increase in the inner layer body due to the squeeze of the outer layer body. Next, the first check valve that allows the contents from the inner layer to pass through,
It is provided in the flow path between the first check valve and the injection hole to block the outflow of the contents from the inner layer in a closed state, while the pressure in the inner layer rises due to the squeeze of the outer layer. A second check valve that is opened together with the first check valve and allows the contents from the inner layer to pass through is provided.
The first check valve has a slit valve and has a slit valve.
The second check valve has a check valve body whose outer peripheral end is supported by an elastic arm, and a valve seat on which the check valve body is seated in a closed state of the second check valve. And
The valve seat and the slit valve are integrally molded.
A content storage space is provided between the first check valve and the second check valve to store a part of the residual content after the content is discharged .
The slit valve has a dome shape that is convex upward, and the outer peripheral end of the slit valve is supported by a valve fixing portion that regulates displacement in the downward and outer peripheral directions. It is a cap for.

Further, it further has an inner plug sandwiched between the cap body and the upper end of the mouth portion.
The valve fixing portion is preferably integrally molded with the inner plug.

Further, the cap body is provided with an outside air introduction hole for introducing outside air into the space between the outer layer body and the inner layer body as the outer layer body is restored by releasing the squeeze.
It is preferable to further have an outside air introduction valve that communicates with the outside air introduction hole and is opened when the outer layer body is restored by releasing the squeeze.

Further, an annular wall surrounding the flow path of the contents from the inner layer body to the injection hole is further provided, and the second check valve is integrally provided on the inner peripheral surface of the annular wall, and the outside air introduction valve is provided. Is preferably provided integrally on the outer peripheral surface of the annular wall.

According to the double container cap of the present invention, it is possible to suppress the intrusion of outside air into the storage space even if the contents containing a small amount of solid matter are stored.

It is a partial cross-sectional view which shows the whole container in the state which the cap for the double container which concerns on 1st Embodiment of this invention is attached to the mouth part of the double container body. It is sectional drawing of the cap for a double container which concerns on 1st Embodiment of this invention. It is a bottom view which shows the 1st check valve (slit valve) which constitutes the cap for a double container which concerns on 1st Embodiment of this invention, and a valve fixing part. It is a top view which shows the 2nd check valve (three-point valve) which comprises the cap for a double container which concerns on 1st Embodiment of this invention. It is a half cross-sectional view which shows the structure of (a) a lid body and (b) a cap body (both after opening a lid body) constituting the cap for a double container which concerns on 1st Embodiment of this invention. FIG. 5 is a cross-sectional view showing a state in which the contents are stored in the contents storage space after the contents are discharged in the double container cap according to the first embodiment of the present invention. It is sectional drawing of the cap for a double container which concerns on 2nd Embodiment of this invention.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

FIG. 1 shows a state in which the double container cap 1 according to the first embodiment of the present invention is attached to a double container main body 2 compatible with the cap 1. The double container cap 1 is composed of a cap body 10, an inner plug 20, a check valve assembly 30, a coupling valve 40, and a lid 50. Further, the double container main body 2 is composed of an inner layer body 3 and an outer layer body 4. In the present specification, claims, abstract and drawings, the side where the lid 50, which will be described later, is located is the upper side (upper side in FIG. 1), and the side where the double container body 2 is located is the lower side (FIG. 1). (Lower side in).

First, the double container main body 2 will be described. In the present embodiment, the double container main body 2 forms a laminated peeling container by performing extrusion blow molding on a parison formed by laminating the synthetic resin material of the inner layer 3 and the synthetic resin material of the outer layer 4. I'm shaping. Ethylene-vinyl alcohol copolymer resin (EVOH) or nylon is used as the material of the inner layer 3 constituting the double container main body 2. Further, low density polyethylene (LDPE) or high density polyethylene resin (HDPE) is used as the material of the outer layer body 4, and high squeeze property can be imparted particularly when LDPE is used. However, the present invention is not limited to this aspect, and when a laminated peeling container is formed by, for example, biaxial stretching blow molding, polypropylene (PP) is used as the material of the inner layer body 3, and polypropylene (PP) is used as the material of the outer layer body 4. Polyethylene terephthalate (PET) may be used. Further, as the material of the inner layer body 3 and the outer layer body 4, other resins having low compatibility with each other can be used. Further, the double container main body 2 may be a container in which the outer layer body 4 and the inner layer body 3 are individually formed and assembled instead of the laminated peeling container. Further, although not shown, one or a plurality of adhesive bands extending in the vertical direction and partially joining the inner layer 3 and the outer layer 4 between the inner layer 3 and the outer layer 4. May be provided.

The inner layer body 3 is formed so as to be deformable in volume reduction, and in the present embodiment, it is obtained by peeling the double container main body 2 formed in a laminated state from the outer layer body 4. .. The inner layer 3 includes a storage space S for accommodating the contents inside the inner layer body 3 and an upper opening 3a (see FIG. 2) connected to the accommodation space S.

The outer layer body 4 is formed by connecting a body portion 6 having recoverable flexibility and a bottom portion 8 that closes the lower end of the body portion 6 to a cylindrical mouth peripheral wall 4a. A male screw portion 4b is provided on the outer peripheral surface of the mouth peripheral wall 4a. Further, the peripheral wall 4a of the mouth portion is provided with a through hole 4c for taking in air between the inner layer body 3, and further, a male screw portion 4b is provided in the vertical direction on the outer peripheral surface provided with the through hole 4c. A notched groove 4d is provided.

Next, the cap main body 10 constituting the double container cap 1 will be described with reference to FIG. The cap body 10 is provided with an outer peripheral wall 11 surrounding the mouth peripheral wall 4a, and a female screw portion 12a corresponding to the male screw portion 4b of the mouth peripheral wall 4a is formed on the inner peripheral surface of the outer peripheral wall 11. Further, on the upper portion of the outer peripheral wall 11, a three-row male screw portion 12b for screw engagement with the lid body 50 described later is provided. Further, the top wall 13 is integrally connected to the upper end of the outer peripheral wall 11. Further, a pouring cylinder 14 is provided in the center of the upper surface of the top wall 13, and a pouring hole 14a for pouring the contents is formed on the inner peripheral surface of the pouring cylinder 14. In the present embodiment, the top wall 13 is provided with two top wall step portions 13a and 13b so that the height decreases toward the outer peripheral direction. Further, on the lower surface of the top wall 13, a pair of upper fitting walls 15 having a concentric double arrangement are provided. Further, an outside air introduction hole 16 penetrating the top wall 13 is provided on the outer side in the radial direction from the upper fitting wall 15. In the present embodiment, the outside air introduction hole 16 is provided in the top wall step portion 13b so as to open outward in the radial direction. With this configuration, the contents overflowing on the top wall 13 are less likely to enter the outside air introduction hole 16. The lower end of the outer peripheral wall 11 is in airtight contact with the mouth peripheral wall 4a, and a ventilation path T leading to the through hole 4c is provided between the mouth peripheral wall 4a and the outer peripheral wall 11.

In the present embodiment, the groove portion 4d that cuts out the male screw portion 4b in the vertical direction is used as the ventilation passage T, but the present embodiment is not limited to this embodiment. The groove portion 4d may not be provided, and the gap between the male screw portion 4b and the female screw portion 12a may be used as the ventilation path T.

Further, in the present embodiment, the outside air introduction hole 16 is provided in the top wall 13 of the cap body 10 and the through hole 4c is provided in the mouth peripheral wall 4a so that the outside air is introduced into the space between the outer layer body 4 and the inner layer body 3. However, the present invention is not limited to this aspect. For example, outside air may be introduced into the space between the outer layer body 4 and the inner layer body 3 from the slit of the pinch-off portion of the bottom portion 8 of the double container main body 2.

An injection plug 19 is provided on the inner peripheral side of the injection cylinder 14 to close the injection hole 14a in the unused state of the double container cap 1. The dispensing plug 19 has a recess 19e in the center of the upper surface, and the fitting column 55 hanging from the lid 50, which will be described later, is strongly undercut engaged with the protrusion 19a at the upper end of the recess 19e to dispense. The stopper 19 is configured so that it is difficult to pull it downward with respect to the lid 50. Further, an outer peripheral rib 19b is provided on the outer peripheral surface of the pouring plug 19, and the outer peripheral rib 19b is inserted between the ribs 54a intermittently provided in the circumferential direction on the inner peripheral surface of the inner seal cylinder 54b of the lid 50, which will be described later. As a result, the ejection plug 19 is constrained to be displaced in the circumferential direction. In the unused state, the pouring plug 19 is integrally connected to the pouring cylinder 14 via a broken portion 19d at the lower end of the outer peripheral surface.

An inner plug 20 is provided inside the cap body 10. The inner plug 20 is located between the injection hole 14a and the inner layer body 3, and includes a partition wall 21 that covers the upper opening 3a of the inner layer body 3.

A fitting wall 25 having a cylindrical shape is provided on the upper surface of the partition wall 21. An annular wall 41 of a coupling valve 40, which will be described later, is configured to be able to be fitted on the inner peripheral surface of the fitting wall 25. On the other hand, directly below the fitting wall 25 on the lower surface of the partition wall 21, a valve fixing portion 23 composed of an outer wall 23e, a horizontal wall 23d, an inner side wall 23c, and a bottom wall 23b is provided. A check valve assembly 30 in which the first check valve 31 and the valve seat 33, which will be described later, are integrally molded is arranged in the region formed by the valve fixing portion 23. Further, on the outer peripheral side of the outer wall 23e, an annular seal wall 26 for sandwiching the inner layer 3 with the outer layer 4 is provided. As shown in FIG. 2, at least one groove 27 is provided on the outer edge of the partition wall 21.

In the first check valve 31, a slit valve 31a having a cross-shaped slit in the center and a dome shape that is convex upward is connected to a cylindrical slit base 31c via a side wall 31b extending upward. .. The first check valve 31 is fixed to the valve fixing portion 23 by the lower end of the annular wall 41 pressing the slit base 31c against the horizontal wall 23d of the valve fixing portion 23. At this time, the bottom wall 23b and the inner side wall 23c of the valve fixing portion 23 come into contact with the outer peripheral end of the slit valve 31a to regulate the displacement in the downward and outer peripheral directions.

The bottom wall 23b of the valve fixing portion 23 is provided with a pressing portion 23a projecting upward via the arm 23f shown in FIG. The pressing portion 23a is provided to press the slit valve 31a from below to slightly open the slit. As a result, the slit of the slit valve 31a does not stick and cannot be opened.

A valve seat 33 extending upward while slightly reducing the diameter is provided at the inner peripheral end of the upper surface of the slit base 31c. The second check valve 43, which will be described later, is closed when the check valve body 43a elastically supported by the check valve arm 43b is seated on the upper surface of the valve seat 33. The inner peripheral surface of the valve seat 33 constitutes a communication port 33a that communicates the inside of the inner layer body 3 with the injection hole 14a.

A second check valve 43 is provided between the injection hole 14a and the first check valve 31. As shown in FIG. 2, the second check valve 43 is provided inside the cylindrical annular wall 41 in the radial direction as a part of the coupling valve 40. As shown in FIG. 4, the second check valve 43 is a so-called three-point valve having a structure in which three points on the outer peripheral edge of the disk-shaped check valve body 43a are supported by the check valve arm 43b. is there. Then, when the check valve body 43a comes into contact with the upper end of the valve seat 33, the second check valve 43 is closed. As shown in FIGS. 2 and 4, a protrusion 43d for restricting the upward displacement of the check valve valve body 43a is provided on the upper surface of the check valve valve body 43a.

When the pressure inside the inner layer 3 is increased by the squeeze of the outer layer 4, the slit valve 31a of the first check valve 31 is elastically deformed upward to open the slit, and the first check valve 31 and the second check valve 31 and the second check valve 31 first stop. The pressure in the content storage space L between the valve 43 and the valve 43 increases. Due to the pressure, the check valve body 43a is lifted upward in FIG. 2 against the elastic force of the check valve arm 43b, and the second check valve 43 is opened by being separated from the valve seat 33. (The state in which the check valve body 43a is displaced upward is shown by a two-dot chain line in FIG. 2). When the squeeze of the outer layer body 4 is released, the slit valve 31a is closed and no pressure is applied to the check valve body 43a. Therefore, the check valve body 43a has its own weight and the elasticity of the check valve arm 43b. The force causes the valve seat 33 to come into contact with the valve seat 33 again, and the second check valve 43 is closed.

The content storage space L provided between the first check valve 31 and the second check valve 43, which is shown in FIG. 2, serves as a flow path for the content when the content is discharged, and also serves as a flow path for the content. A part of the contents remaining after the discharge of the check valve 31 is stored in the contents storage space L to cover and seal the slit valve 31a of the first check valve 31. That is, the contents stored in the contents storage space L form a so-called liquid seal, and the invasion of outside air into the inner layer 3 can be suppressed.

The first check valve 31 can be made of a soft material such as silicon rubber or an elastomer. Further, the second check valve 43 can be made of a resin material such as low density polyethylene (LDPE).

In the present embodiment, the slit valve 31a has a dome shape having a convex shape upward, but is not limited to this embodiment, and may have a convex shape downward, for example, or may have a flat surface. It may be in shape. Further, the slits formed in the slit valve 31a may have a shape other than a cross shape, for example, a curved shape, and the number of slits may be one or three or more.

Further, in the present embodiment, the check valve body 43a constituting the second check valve 43 is composed of a disk-shaped member, but the present invention is not limited to this mode, and the member has a rectangular shape or the like. May be good. Further, the second check valve 43 does not necessarily have to be a three-point valve, and the valve body such as a one-point valve, a two-point valve, or a four-point valve is supported by an elastic arm and opened by a positive pressure in the inner layer body 3. Various valves can be used.

On the other hand, as shown in FIG. 2, an outside air introduction valve 45 is provided on the outer side of the annular wall 41 in the radial direction. The outside air introduction valve 45 is formed as an annular and thin-walled valve body 45a on the radial outer side of the annular wall 41. The valve body 45a closes the outside air introduction hole 16 by connecting the inner peripheral side end portion to the outer peripheral surface of the annular wall 41 and seating the outer peripheral side end portion on the lower surface of the top wall 13 of the cap body 10. As can be seen from FIG. 2, the annular valve body 45a is formed in a curved shape that is convex toward the inner layer body 3. By adopting this curved shape, the valve body 45a can surely maintain the outside air introduction valve 45 in the closed state until a predetermined negative pressure is applied.

In the present embodiment, the second check valve 43 and the outside air introduction valve 45 are configured to be integrally provided with the annular wall 41, but the present embodiment is not limited to this embodiment. For example, the second check valve 43 may be provided on the first annular wall, and the outside air introduction valve 45 may be provided on the second annular wall so that the two are separately configured. Further, the second check valve 43 and the outside air introduction valve 45 may be fixed to something other than the annular wall 41.

In the present embodiment, when the second check valve 43 is attached to the cap body 10 and the inner plug 20 as shown in FIG. 2, the lower portion of the annular wall 41 is fitted and held on the inner peripheral surface of the fitting wall 25. The upper part of the annular wall 41 is fitted and held by the pair of upper fitting walls 15. As a result, as shown in FIG. 2, an inner space K1 that communicates the communication port 33a and the injection hole 14a to form a flow path for the contents is formed inside the annular wall 41 in the radial direction, and is annular. On the radial outer side of the wall 41, an outer space K2 is formed in which the outside air introduction hole 16 and the groove 27 communicate with each other to form an air flow path.

As shown in FIG. 2, the lid 50 is connected to the outer peripheral wall 11 of the cap body 10 and can cover the injection hole 14a and the outside air introduction hole 16. More specifically, the lid 50 includes a flat upper wall 52 and a lid peripheral wall 53 that is connected to the edge of the upper wall 52 and is connected to the outer peripheral wall 11. On the inner peripheral surface of the lid peripheral wall 53, a three-row female screw portion 53e configured to be screw-engageable with the three-row male screw portion 12b provided on the upper portion of the outer peripheral wall 11 of the cap body 10 is provided. Then, at the center of the lower surface of the upper wall 52, a fitting pillar 55 that undercuts and engages with the recess 19e of the dispensing plug 19 provided on the inner peripheral surface of the dispensing cylinder 14 hangs downward. Further, on the outer peripheral side of the fitting column 55 on the upper wall 52, a tubular outer seal cylinder 54 is provided which enters the inside of the injection cylinder 14 when the lid 50 is closed and seals the injection hole 14a. ing. Further, on the outer peripheral side of the outer seal cylinder 54, a contact wall 56 that comes into contact with the upper surface of the top wall 13 when the lid 50 is attached to the cap body 10 hangs downward.

The lid body 50 may be configured to be integrally molded with the cap body 10 via a hinge or the like without providing the three-row female screw portion 53e, or may be attached to the cap body 10 by undercutting. It may be configured.

Further, a fixing band 53a surrounding the outer peripheral wall 11 of the cap body 10 is connected to the lower end of the lid peripheral wall 53 of the lid 50 via a broken portion 53d. Ribs 53b are intermittently provided on the inner peripheral surface of the fixed band 53a in the circumferential direction, and the circumference of the fixed band 53a is provided by interposing between the ribs 12d intermittently provided on the outer peripheral surface of the outer peripheral wall 11. Directional movement is restricted. Further, a protrusion 53c protruding in the inner peripheral direction is provided at the lower end of the fixed band 53a, and the fixed band 53a is displaced upward by the undercut engagement of the protrusion 53c with the lower end of the rib 12d. Is regulated. As a result, the fixing band 53a is positioned in the vertical direction so that the protrusion 53c is located between the rib 12d and the step 11a.

When discharging the contents from the double container cap 1 configured as described above, the user rotates the lid 50 in the circumferential direction from the state shown in FIG. 2 to rotate the three-row male screw portion 12b and the three-row female screw portion. The screw engagement with 53e is released. As described above, the fixed band 53a is restrained from being displaced in the vertical direction and the circumferential direction with respect to the outer peripheral wall 11 by the rib 53b and the protrusion 53c. On the other hand, as the lid body peripheral wall 53 rotates in the circumferential direction of the lid body 50, the screw engagement is released and the lid body peripheral wall 53 moves upward. In this way, the fractured portion 53d is cut as the lid peripheral wall 53 moves relative to the fixing band 53a in the circumferential direction and the upward direction. Similarly, while the pouring cylinder 14 is integrated and fixed to the outer peripheral wall 11, the pouring plug 19 is vertically and peripherally relative to the lid 50 by the outer peripheral rib 19b and the protrusion 19a. Since the displacement is constrained in the direction, the lid 50 moves upward while rotating as the lid 50 rotates in the circumferential direction. In this way, the broken portion 19d is cut along with the relative movement of the pouring plug 19 with respect to the pouring cylinder 14 in the circumferential direction and the upward direction. The states of the lid 50 and the cap body 10 after the broken portions 53d and 19d are cut are shown in FIGS. 5 (a) and 5 (b), respectively.

When the lid 50 is opened from the unused state by the above procedure, as shown in FIG. 5A, the pouring plug 19 is on the lid 50 side with the fitting column 55 undercut engaged with the recess 19e. Accompanying. As a result, as shown in FIG. 5B, the injection plug 19 is removed from the injection hole 14a, and the contents can be discharged.

After opening the lid 50, the double container body 2 shown in FIG. 6 is changed from the standing posture to the tilted posture, and the body portion 6 (see FIG. 1) of the outer layer body 4 is pressed (squeezed). As a result, the inside of the inner layer 3 is pressurized through the air between the inner layer 3 and the outer layer 4. When the body 6 of the outer layer body 4 is pressed, pressure is also applied to the valve body 45a from below through the through hole 4c, the ventilation passage T, and the groove 27, so that the outside air introduction valve 45 is maintained in the closed state. Will be done. Therefore, even if the outer layer 4 is pressed, the air between the inner layer 3 and the outer layer 4 does not leak from the outside air introduction hole 16, and the pressurization into the inner layer 3 is not hindered. .. Then, the positive pressure in the inner layer body 3 deforms the slit valve 31a of the first check valve 31 to open the slit, so that the positive pressure between the first check valve 31 and the second check valve 43 The pressure in the content storage space L also increases. The check valve body 43a of the second check valve 43 is lifted from the valve seat 33 by the positive pressure in the content storage space L, and the second check valve 43 is also opened. The contents enter the contents storage space L through the open slit of the slit valve 31a, pass through the gap between the check valve body 43a and the valve seat 33, and then note via the inner space K1. It is poured out from the exit hole 14a.

After pouring out the required amount of contents, the user releases the pressure on the body 6 of the outer layer 4. As a result, the positive pressure in the inner layer 3 returns to the outside air pressure, and the pressure in the content storage space L also decreases in conjunction with the decrease in the pressure in the inner layer 3. As a result, the slit valve 31a of the first check valve 31 is closed, and the check valve body 43a of the second check valve 43 also comes into contact with the valve seat 33 and is closed. The first check valve 31 and the second check valve 43 are closed almost at the same time, but it is considered that the timing of closing each valve changes depending on the rigidity of each valve body and the like. When the first check valve 31 and the second check valve 43 are closed, as shown in FIG. 6, a part of the contents remaining without being discharged is stored in the contents storage space L, so that the liquid is liquid. The seal is constructed. That is, even when the solid matter contained in the contents is sandwiched between the check valve valve body 43a and the valve seat 33 and the second check valve 43 is not completely blocked, the contents storage space L The contents stored therein serve as a sealing material and cover the slit valve 31a of the first check valve 31. Therefore, the outside air from the injection hole 14a does not pass through the content storage space L and enter the inner layer 3. Further, even when a solid substance is sandwiched between the slit valve 31a of the first check valve 31 and a gap is formed in the slit, if the content has a certain viscosity or more, it is stored in the content storage space L. The contents do not return to the accommodation space S through the gap. Therefore, since the contents are maintained in the contents storage space L, the liquid seal can be maintained.

Further, when the pressure on the body portion 6 is released, the outer layer body 4 tries to return to the original shape by its own restoring force, so that the space between the inner layer body 3 and the outer layer body 4 becomes a negative pressure. As a result, the pressure below the outside air introduction valve 45 also becomes negative through the through hole 4c, the ventilation passage T, and the groove 27, so that the valve body 45a is pulled downward and the outside air introduction valve 45 is opened. With the opening of the outside air introduction valve 45, air flows in from the outside air introduction hole 16, passes through the outer space K2, the groove 27, and the ventilation passage T, and is the space between the outer layer 4 and the inner layer 3 through the through hole 4c. Air is introduced into. As a result, the outer layer 4 can be restored while the inner layer 3 is reduced in volume and deformed.

In the present embodiment, since the slit valve 31a has a dome shape that is convex toward the injection hole 14a, tensile stress acts on the slit valve 31a when the pressure inside the inner layer 3 becomes positive. A force acts in the direction of opening the slit. On the other hand, when the positive pressure in the inner layer body 3 is released, the slit valve 31a restores to the original shape by its own rigidity and closes the slit. Moreover, as described above, the outer peripheral end of the slit valve 31a is restricted from being displaced downward and outward by the valve fixing portion 23, so that the slit is prevented from opening downward. That is, the first check valve 31 is easy to open in the direction in which the contents are directed from the inner layer 3 toward the injection hole 14a, and is difficult to open in the direction in which the contents are going to flow back from the injection hole 14a toward the inner layer 3. It is configured as follows. Therefore, the force applied to squeeze the body portion 6 can be reduced, and the contents in the content storage space L can be made difficult to move into the inner layer body 3, and the effect of the liquid seal can be enhanced.

As described above, according to the present embodiment, the first check valve 31 having a slit valve 31a and the check valve body 43a having a three-point valve configuration are provided between the inner layer body 3 and the injection hole 14a. A second check valve 43 to be provided is provided, and a content storage space L is provided between the first check valve 31 and the second check valve 43. With this configuration, the liquid seal is formed by the contents remaining in the contents storage space L, so that the second check valve 43 is clogged with the solids using, for example, the contents including the solids such as ingredients. However, it is possible to prevent the residual contents in the contents storage space L from entering the storage space S by blocking the outside air. In particular, in the present embodiment, the slit valve 31a of the first check valve 31 and the valve seat 33 of the second check valve 43 are integrally molded, so that the number of parts is reduced and the cap for the double container is capped. The assembly man-hours of 1 can be reduced. Then, even if the first check valve 31 is clogged with solid matter and a gap is formed in the slit, the content does not flow in through the gap if the content has a certain viscosity or more, so that the liquid seal is maintained. Can be done. In particular, by forming the first check valve 31 close to the accommodation space S with the slit valve 31a, the first check valve 31 can be reliably closed and the outside air can be shut off by releasing the pressing of the body portion 6. Further, by forming the second check valve 43 not with a slit valve but with a three-point valve or the like that is easy to open, it is possible to reduce the pressing force of the body portion 6 required for ejecting the contents. The present invention includes, for example, sauces such as pasta sauce, pizza sauce, Worcestershire sauce, and tonkatsu sauce, and liquid seasonings containing ingredients such as ketchup, mayonnaise, dressing, and liquid miso. It can be used for containment. Especially when the contents having a relatively high viscosity are stored, the liquid sealing property is enhanced and a remarkable effect is exhibited.

Further, according to the present embodiment, the slit valve 31a of the first check valve 31 has a dome shape that is convex upward, and the outer peripheral end of the slit valve 31a regulates displacement in the downward and outer peripheral directions. It is supported by the fixing portion 23. With this configuration, the first check valve 31 is easily opened by the positive pressure in the inner layer body 3, while when the positive pressure in the inner layer body 3 is released, the contents are injected from the inner layer body 3. It can be made difficult to open in the direction toward 14a.

Further, according to the present embodiment, the inner plug 20 sandwiched between the cap body 10 and the upper end of the peripheral wall 4a of the mouth portion is provided, and the valve fixing portion 23 supporting the slit valve 31a is integrally molded with the inner plug 20. I tried to do it. As a result, the number of parts can be reduced, and the man-hours for assembling the double container cap 1 can be reduced.

Further, according to the present embodiment, the outside air introduction valve 45 is configured to communicate with the outside air introduction hole 16 and be opened when the outer layer body 4 is restored by releasing the squeeze. As a result, when the body portion 6 is squeezed, pressure is also applied to the valve body 45a from below, so that the outside air introduction valve 45 is maintained in a closed state, and the air between the inner layer body 3 and the outer layer body 4 does not leak. No, the pressurization into the inner layer 3 is not hindered. On the other hand, when the pressing of the body portion 6 is released, the space between the inner layer body 3 and the outer layer body 4 becomes a negative pressure due to the restoring force of the outer layer body 4. As a result, since the outside air introduction valve 45 is opened, air easily flows in from the outside air introduction hole 16, and the outer layer body 4 can be restored while the inner layer body 3 is volume-reduced and deformed.

Further, according to the present embodiment, since the second check valve 43 and the outside air introduction valve 45 are integrally provided with the annular wall 41, the number of parts is reduced and the man-hours for assembling the double container cap 1 are reduced. can do.

Further, according to the present embodiment, the valve body 45a of the outside air introduction valve 45 is configured to have a curved shape that is convex toward the inner layer body 3. As a result, the outside air introduction valve 45 can be maintained in the closed state until a predetermined negative pressure is applied.

The double container cap 1 according to the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims. For example, the outer layer body 4 and the inner layer body 3 are not limited to those formed by blow molding a parison having a laminated structure, and the outer layer body 4 and the inner layer body 3 are individually formed, and then the inner layer body 3 is formed into an outer layer body. It may be installed in 4.

FIG. 7 shows a state in which the double container cap 100 according to the second embodiment of the present invention is attached to a double container main body 2 compatible with the cap 100. The double container cap 100 is composed of a cap body 10, an inner plug 120, a check valve assembly 130, a coupling valve 40, and a lid 50. The double container cap 100 according to the present embodiment has the shape of the valve fixing portion 123 constituting the inner plug 120 and the shapes of the first check valve 131 and the valve seat 133 constituting the check valve assembly 130. However, there is no difference from the first embodiment except that the check valve 31 and the valve seat 33 of the first embodiment are different. Therefore, here, the description will be focused on the differences from the first embodiment.

The check valve assembly 130 of the present embodiment has a first check valve 131 having a narrower radial width as compared with the first embodiment. Further, due to the narrow width of the first check valve 131, the width of the content storage space L provided between the first check valve 131 and the second check valve 43 in the radial direction is also the same. It is narrowly constructed. Further, the shape of the valve seat 133 does not reduce the diameter upward as in the first embodiment, but has a substantially cylindrical shape having a constant radius.

As described above, in the double container cap 100 according to the present embodiment, since the valve seat 133 has a substantially cylindrical shape, the check valve assembly 130 is molded as compared with the first embodiment. There is no need to forcibly remove the mold when removing it from the mold. Therefore, the check valve assembly 130 can be easily molded and the moldability is improved.

Further, in the double container cap 100 according to the present embodiment, the width of the first check valve 131 in the radial direction is narrower than that of the first embodiment, so that the slit is slit against the pressing force of the same body portion 6. The force received by the valve 131a is small. Therefore, when the body 6 is pressed more firmly, the first check valve 131 is in the open state, so that the first check valve 131 is in the open state and the contents leak out against the will of the user. Never. Further, when the pressing of the body portion 6 is stopped, the first check valve 131 returns to the closed state more quickly, so that the contents do not leak to the outside after the pressing is stopped.

According to the present invention, it is possible to provide a double container cap 1 capable of suppressing the intrusion of outside air into the storage space S even if the contents containing a small amount of solid matter are stored.

1,100 Double container cap 2 Double container body 3 Inner layer 3a Upper opening 4 Outer layer 4a Mouth peripheral wall (mouth)
4b Male thread 4c Through hole 4d Groove 6 Body 8 Bottom 10 Cap body 11 Outer wall 11a Step 12a Female thread 12b Three-row male thread 12d Rib 13 Top wall 13a, 13b Top wall Step 14 Injection tube 14a Upper fitting wall 16 Outside air introduction hole 19 Injection plug 19a Protrusion 19b Outer rib 19d Break 19e Recess 20, 120 Inner plug 21,121 Partition wall 23,123 Valve fixing part 23a, 123a Pressing part 23b, 123b Bottom wall 23c, 123c Inner side wall 23d, 123d Horizontal wall 23e, 123e Outer side wall 23f Arm 25 Fitting wall 26 Seal wall 27 Groove 30, 130 Check valve assembly 31,131 First check valve 31a, 131a Slit valve 31b, 131b Side wall 31c , 131c Slit base 33, 133 Valve seat 33a, 133a Communication port 40 Coupling valve 41 Circular wall 43 Second check valve 43a Check valve valve body 43b Check valve arm 43d Protruding part 45 Outside air introduction valve 45a Valve body 47 Circumferential wall 50 Lid 52 Upper wall 53 Lid peripheral wall 53a Fixed band 53b Rib 53c Protrusion 53d Break 53e Sanjo female thread 54 Outer seal cylinder 54a Rib 54b Inner seal cylinder 55 Fitting pillar 55a Protruding part 56 Contact wall K1 Inner space Space L Contents storage space S Storage space T Ventilation channel

Claims (4)

A double container cap to be attached to a double container body including an inner layer body for accommodating the contents and a squeeze outer layer body for accommodating the inner layer body.
A cap body having a pouring hole for pouring out the contents from the inner layer and attached to the mouth of the double container body, and a cap body.
It is provided in the flow path between the inner layer body and the injection hole to block the outflow of the contents from the inner layer body in the closed state, while it is opened by the pressure increase in the inner layer body due to the squeeze of the outer layer body. Next, the first check valve that allows the contents from the inner layer to pass through,
It is provided in the flow path between the first check valve and the injection hole to block the outflow of the contents from the inner layer in a closed state, while the pressure in the inner layer rises due to the squeeze of the outer layer. A second check valve that is opened together with the first check valve and allows the contents from the inner layer to pass through is provided.
The first check valve has a slit valve and has a slit valve.
The second check valve has a check valve body whose outer peripheral end is supported by an elastic arm, and a valve seat on which the check valve body is seated in a closed state of the second check valve. And
The valve seat and the slit valve are integrally molded.
A content storage space is provided between the first check valve and the second check valve to store a part of the residual content after the content is discharged .
The slit valve has a dome shape that is convex upward, and the outer peripheral end of the slit valve is supported by a valve fixing portion that regulates displacement in the downward and outer peripheral directions. For cap. Further having an inner plug sandwiched between the cap body and the upper end of the mouth portion,
The double container cap according to claim 1 , wherein the valve fixing portion is integrally molded with the inner plug. The cap body is provided with an outside air introduction hole for introducing outside air into the space between the outer layer body and the inner layer body as the outer layer body is restored by releasing the squeeze.
The double container cap according to claim 1 or 2 , further comprising an outside air introduction valve that communicates with the outside air introduction hole and is opened when the outer layer body is restored by releasing the squeeze play. An annular wall surrounding the flow path of the contents from the inner layer body to the injection hole is further provided, the second check valve is integrally provided on the inner peripheral surface of the annular wall, and the outside air introduction valve is provided. The double container cap according to claim 3 , which is integrally provided on the outer peripheral surface of the annular wall.

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