JPWO2017109866A1 - Airtight container with inner lid - Google Patents

Abstract

It is an object of the present invention to provide an airtight container with an inner lid having a high function capable of preventing leakage of contents even under a reduced pressure environment while having a simple structure that can be manufactured at low cost.
An outer lid (3) that covers the opening (24) of the container body (2) so as to be openable and closable, and a frame (53) having a flange (52) at the upper end, and a dome-like shape that protrudes downward from the frame (53). And a partition wall portion (51) that is easily elastically deformed, and an inner lid (5a) in which the outer peripheral side surface (55) of the frame body is in close contact with the inner surface of the opening end side of the container body. It has a central region (12) consisting of a dome-shaped concave portion inside the surface portion (10) and a peripheral region (13) that circulates around the concave portion in an annular shape. When the region abuts on the flange portion and the inner surface of the central region is deformed so that the partition wall protrudes upward, the surface area of the partition wall in the deformed state is equal to or less than the surface area of the partition wall in the initial state. Airtight container with inner lid formed in a shape that regulates to ( Is set to a).

Description

  The present invention relates to an airtight container with an inner lid. Specifically, the present invention relates to an airtight container with an inner lid that is sealed in an airtight state by attaching an inner lid to the opening of the container body.

  The sealed container with an inner lid targeted by the present invention includes a container main body, an outer lid that covers the opening of the container main body and also functions as an exterior body of the container, and an attachment / detachment for sealing the opening of the container main body in an airtight state. It has a possible inner lid. In such a sealed container with an inner lid, the inner lid has a dish-like structure in which a partition wall portion serving as a bottom surface is integrally formed inside a frame body having a flange formed at the upper end. The inner lid is fitted in the opening of the container main body, and when the inner lid is fitted in the opening, the outer peripheral surface of the frame body in the inner lid is in close contact with the inner surface of the opening side end of the container main body, and the flange The lower surface of the container abuts on the upper peripheral surface around the opening of the container body.

  By the way, in this kind of sealed container with an inner lid, since the degree of sealing of the container main body by the inner lid is high, the container main body is shallow, or the container main body is filled with liquid or gel-like contents to the vicinity of the opening In some cases, when the inner lid is attached to the opening of the container body, the compression ratio of the air in the container body before and after the inner lid is attached is increased. That is, as the frame of the inner lid is inserted into the container main body, the pressure in the container main body increases, and the inner lid is urged upward by the internal pressure so that the inner lid can be easily attached to the container main body. Cannot be installed. Even if it can be mounted, the inner lid may come off due to impact or vibration because the internal pressure is still involved. Of course, if the inner lid is carefully attached while allowing air in the container body to escape, the inner lid may be securely attached. However, in this case, the inside lid cannot be easily removed because the inside of the container has a negative pressure.

  The following Patent Document 1 describes a compact container including an inner plate and a soft elastic material seal portion having a thin central deformation portion curved in a spherical arc shape. In the compact container, When this seal body is attached to the opening of the intermediate dish body, the central deformation portion is deformed as the internal pressure of the intermediate dish body increases, and the increased internal pressure is absorbed. That is, the central deformation part functions as a diaphragm.

JP-A-9-285336

  Also in the sealed container with an inner lid targeted by the present invention, the inner lid is made into a container body by providing a bottom surface that functions as a diaphragm on a dish-shaped inner lid having a flange like the compact container described in Patent Document 1. It is considered that the increase in the internal pressure at the time of mounting in the opening is absorbed, and attachment / detachment becomes easy. However, in the compact container described in Patent Document 1, the sealing body has a substantially disk shape, and a complex uneven structure is formed on both the upper and lower surfaces of the outer peripheral region of the central deformation portion. In addition, unevenness that engages with the uneven shape is also formed on the lower surface of the outer lid and the upper end surface of the opening periphery of the inner tray. Furthermore, a groove (engagement circumferential groove) is formed around the side surface in the peripheral region of the seal body. The compact container includes a main body, an outer lid that opens and closes by a hinge on the main body, and an assembly ring body that is a separate object from the inner tray, and the assembly ring body engages with an engagement circumferential groove of the seal body. The shape of the sealing body made of a soft elastic material is maintained. As described above, in the compact container described in Patent Document 1, the opening of the inner tray is sealed with the seal body by an extremely complicated structure, and it is difficult to provide it at a lower cost.

  On the other hand, the inner lid of an airtight container with an inner lid has a simple structure with a partition wall inside the frame with a flange, and if the partition wall functioning as a diaphragm is provided, the opening periphery of the container body is special. It is not necessary to form in a shape, and cost reduction is easy. However, with the simple structure of the inner lid, there is a concern that the contents may leak if the inner lid is attached to the container body under atmospheric pressure and then placed in a decompressed environment such as an altitude or an aircraft luggage compartment. Is done. Specifically, when the atmospheric pressure around the container body in a sealed state decreases, the internal pressure relatively increases, and the diaphragm tends to bend further upward. And since the periphery of the diaphragm is integrated with the inner periphery of the frame, force is applied in the direction of reducing the diameter of the frame. The inner lid is sealed so that the outer peripheral side surface of the frame body is in close contact with the inner peripheral side surface of the container body, so that when the force in the diameter reducing direction is applied to the frame body, the frame body is bent so that the diameter of the frame body itself is reduced. Mu As a result, the adhesion between the outer peripheral surface of the frame and the inner surface of the container main body is lowered, and the contents leak out of the container main body as the relative internal pressure in the container main body increases. Of course, leakage may occur in the compact container described in Patent Document 1 for the same reason. However, in the case of a dish-shaped inner lid provided with a flat flange, the flange may be the end face of the opening edge of the container body or the outside. Since it is not formed so as to engage with the inner shape of the lid, it can be said that liquid leakage is more likely to occur than the compact container described in Patent Document 1.

  Accordingly, an object of the present invention is to provide an airtight container with an inner lid having a simple structure that can be manufactured at low cost and having a high function capable of preventing leakage of contents even under a reduced pressure environment.

The present invention for achieving the above object comprises a bottomed container body having an opening upward, an outer lid that covers the opening so as to be openable and closable, and an inner lid for sealing the container body in an airtight state. A sealed container with an inner lid provided,
In the inner lid, a partition wall portion that is easily elastically deformed with respect to the frame body is formed on the inner side of the frame body having a flange at an upper end, and the outer peripheral side surface of the frame body is in a state of being attached to the container body. Adhering closely to the inner surface of the container body on the open end side,
The partition wall is formed in a dome shape protruding downward in an initial state where the inner lid is not attached to the container body, and is formed to be deformable into a dome shape protruding upward,
The outer lid has a central area formed of a dome-shaped recess inside the top surface and a peripheral area that circulates around the recess annularly, and the outer lid is mounted on the container body while the outer lid is mounted on the container. In the closed state covering the opening of the main body, the central region faces the partition wall portion and the peripheral region abuts on the upper surface of the flange portion,
The inner surface of the central region is formed in a shape that regulates the surface area of the partition wall in the deformed state to be equal to or less than the surface area of the partition wall in the initial state when the partition wall is deformed so as to protrude upward. Yes,
It is set as the airtight container with an inner lid characterized by the above.

  The height difference between the peripheral edge position of the partition wall and the upper end of the central area in the closed state is not more than the height difference between the lower edge of the partition wall and the peripheral edge, and the surface area of the central area facing the partition wall Is not more than the surface area of the upper surface of the partition wall in the initial state.

  The inner lid is preferably a sealed container with an inner lid having a shape in which the peripheral edge of the partition wall portion is connected to the inner peripheral upper end of the flange portion.

  It is good also as an airtight container with an inner cover which has a vent which connects the inner surface side of the said center area | region, and external air. It is more preferable that the vent is a groove extending in the radially outward direction formed in at least one of the peripheral region or the upper surface of the flange.

  The sealed container with an inner lid according to any one of the above, wherein the outer lid has a mounting mechanism that engages with an upper end surface shape of the container body inward, and closes the opening at the top surface portion. When the container body is pressed from above to below, it can be configured to be mounted on the container body by the mounting mechanism.

  According to the sealed container with an inner lid according to the present invention, it can be manufactured at a low cost with a simple structure, and leakage of contents can be prevented even under a reduced pressure environment. Other effects will be clarified in the following description.

It is a figure which shows the external appearance of the airtight container with an inner cover which concerns on the 1st Example of this invention. It is a disassembled perspective view of the airtight container with an inner cover which concerns on the said 1st Example. It is a figure which shows the structure of the inner cover of the airtight container with an inner cover which concerns on the said 1st Example. It is a figure which shows operation | movement of the airtight container with an inner lid concerning the said 1st Example. It is a disassembled perspective view which shows the structure of the outer cover (cap) of the airtight container with an inner cover based on the 2nd Example of this invention. It is a figure which shows the modification of the inner lid which comprises the airtight container with an inner lid which concerns on the said 1st Example. It is a figure which shows the other modification of the inner lid which comprises the airtight container with an inner lid which concerns on the said 1st Example. It is a figure for demonstrating the problem of the inner cover which concerns on the said other modification. It is a figure which shows the solution of the problem of the inner cover which concerns on the said other modification.

Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that in the drawings used for the following description, the same or similar parts may be denoted by the same reference numerals and redundant description may be omitted. In some drawings, reference numerals may be assigned to parts that are not required in other drawings if unnecessary.
=== First Embodiment ===
<Structure of sealed container with inner lid>
FIG. 1 is an external view of an airtight container with an inner lid (hereinafter referred to as an airtight container 1a) according to a first embodiment of the present invention. As shown in FIG. 1, the airtight container 1a has a substantially cylindrical shape. And a container main body 2 for containing the contents therein, and a bottomed cylindrical outer lid (hereinafter referred to as a cap 3) mounted on the container main body 2 from above. Here, when the cylindrical shaft 100 of the cylindrical sealed container 1a is defined as the vertical direction, and the vertical direction is defined assuming that the cap 3 is mounted above the container body 2, the cap 3 is a bottomed cylinder whose lower end side is open. The top surface portion 10 serving as a canopy is bonded to the upper end side of the hollow cylindrical body portion 31 and the opening on the upper end side is closed. In addition, a mechanism for mounting the cap on the container body 2 (hereinafter referred to as mounting mechanism) is built in the cap 3. A rectangular hole 32 that communicates the inside and the outside is formed in the body portion 31, and a push button 41 that is a part of the mounting mechanism projects outwardly through the hole.

  FIG. 2 is an exploded perspective view of the sealed container 1a for each member. The container body 2 has a two-stage cylindrical outer shape in which a hollow cylindrical neck portion 22 having a reduced diameter is continuously provided above a diameter-enlarged bottomed cylindrical storage portion 21 that is a storage space for contents. The upper end of the neck portion 22 is an opening 24. The inner surface 23 of the container body 2 has a bottomed cylindrical shape that maintains the shape of the opening 24 and reaches the bottom surface 25, and the accommodating portion 21 is an expanded cylindrical portion that forms an outer peripheral portion regardless of whether it is hollow or bottomed. It has a double cylindrical shape in which a bottomed cylindrical portion having a reduced diameter continuous downward from the neck portion 22 is formed inside.

  Further, a projection 26 for engaging with the mounting mechanism 4 in the cap 3 is formed around the outer periphery of the neck portion 22, and this projection (hereinafter referred to as the circumferential projection 26) has a flat bottom surface and a tapered top surface. Is formed. In the cap 3, the body portion 31 and the disk-shaped top surface portion 10 are configured separately, and the top surface portion 10 is bonded to the upper end side of the body portion 31. In this example, a hollow cylindrical peripheral wall 14 is formed concentrically with the outer periphery of the top surface portion 10 on the lower surface of the top surface portion 10, and a part of the top surface wall portion 14 has a plurality of vertically extending portions. A slit 18 is formed, and between the adjacent adjacent slits in the top wall 14 is a tongue piece 17 that is bent radially outward with the upper end of the top wall 14 as a fulcrum. The operation of the top wall 14 will be described later.

  The mounting mechanism 4 built in the body 31 has a structure in which the above-described push buttons 41 are integrally projected at two locations on the outer surface of an elastic elliptical annular frame (hereinafter referred to as a mounting frame 42). doing. In addition to the hole 32 for leading out the push button 41 described above, a support piece 33 for supporting the mounting frame 42 is formed on the inner surface of the body portion 31 of the cap 3 so as to protrude inward. When the cap 3 having the above structure is assembled, the mounting mechanism 4 is inserted into the body 31 from above, and the lower end of the mounting frame 42 of the mounting mechanism 4 is pushed against the support piece 33 in the body 31. The button 41 may be led out from the hole 32 of the body part 31 and the top surface part 10 may be bonded to the upper end side of the body part 31 to close the opening on the upper end side of the body part 31.

The push button 41 in the mounting mechanism 4 is formed facing the major axis direction of the elliptical annular mounting frame 42, and when the two push buttons 41 are pressed in the direction facing each other, the major axis of the elliptical annular mounting frame 42 is formed. Increases in the short axis direction as it is elastically deformed in the diameter reducing direction. Further, a projection (hereinafter referred to as an engagement projection 43) that protrudes in the form of a tongue piece is formed on the inner surface of the mounting frame 42 on the short axis side. The engagement projection 43 has a flat upper surface and a tapered lower surface. ing. When the assembled cap 3 is inserted into the neck portion 22 from above the container body 2, the lower surface of the tapered engagement projection 43 and the upper surface of the circumferential projection 26 of the neck portion 22 come into contact with each other. Urges the engaging protrusion 43 outward. As a result, the elliptical mounting frame 42 in the mounting mechanism 4 is elastically deformed in the diameter-expanding direction on the short axis side, and the engagement protrusion 43 gets over the circular protrusion 26. When the mounting frame 42 returns to the original elliptical ring shape, the flat upper surface of the engagement protrusion 43 and the lower surface of the circumferential protrusion 26 are engaged with each other. In this way, the cap 3 is attached to the neck portion 22. Further, when the push button 41 is pressed in a state where the cap 3 is mounted, the engagement projection 43 is urged outwardly by elastic deformation so that the short axis of the mounting frame 42 of the mounting mechanism 4 expands. As a result, the engagement state between the engagement protrusion 43 and the circumferential protrusion 26 is released, and the cap 3 can be removed. In the above-described engagement structure between the cap 3 and the container body 2, the opening 24 of the container body 2 cannot be sealed in an airtight state. Therefore, in the sealed container 1a according to the first embodiment, the container body 2 is sealed by attaching the inner lid 5a to the opening 24.
<Internal lid structure>
FIG. 3 shows the structure of the inner lid 5a. FIG. 3 is a cross-sectional view taken along the line aa in the inner lid 5a shown in FIG. 2, and is a longitudinal sectional view when the inner lid 5a is cut along a plane including the vertical direction. The inner lid 5a is an integrally molded product made of polypropylene, and as shown in FIG. 3, has a structure in which a partition wall 51 serving as a bottom surface is formed inside a frame body having a flange 52 formed at the upper end. Yes. Specifically, the inner lid 5 a is formed in a flat hollow cylindrical frame-like portion (hereinafter referred to as an outer peripheral portion 53), a flange 52 formed at the upper end of the outer peripheral portion 53, and an inner side of the outer peripheral portion 53. And a partition wall 51. In addition, the partition wall portion 51 has a peripheral edge 54 connected to the outer peripheral portion 53 at the upper end position of the flange 52, and in this example, the initial shape is a dome shape protruding downward to become a part of a spherical shell. The partition wall portion 51 is formed to be thin with respect to the outer peripheral portion 53 so as to be easily elastically deformed, and the peripheral edge 54 of the partition wall portion 51 is configured to be thinner than other regions of the partition wall portion 51. The partition wall 51 is configured to be deformed in the vertical direction with the thin peripheral edge 54 as a fulcrum. The material for the inner lid 5a may be any material that can be elastically deformed. For example, an appropriate material such as polyethylene, silicone, rubber, or the like can be used.

The sealed container 1a according to the first embodiment shown in FIGS. 1 and 2 is characterized by the structure of the inner lid 5a and the shape of the inner surface 11 of the top surface 10 constituting the cap 3, and the container body The inner lid 5a can be easily attached to and detached from the container 2, and the contents are difficult to leak out even in the reduced pressure environment of the sealed container 1a with the container main body 2 sealed by the inner lid 5a. Below, the mounting structure of the cap 3 and the inner lid 5a and the container body 2 in the sealed container 1a and the operation of the inner lid 5a will be described.
<Mounting structure of cap and inner lid>
FIG. 4 shows the mounting structure of the cap 3 and the inner lid 5a on the container body 2 and the operation of the inner lid. 4 is an enlarged vertical cross-sectional view of the upper part of the sealed container 1a. FIG. 4 (A) shows a state in which the inner lid 5a is attached under an atmospheric pressure environment, and FIG. The deformation | transformation state of the partition part 51 when the internal pressure of the container main body 2 sealed with the lid | cover 5a becomes very large relatively with respect to the circumference | surroundings is shown. First, a mounting structure diagram of the cap 3 and the inner lid 5a to the container body 2 will be described with reference to FIG. When the inner lid 5 a is attached to the opening 24 of the container body 2, the outer surface 55 of the outer peripheral portion 53 comes into close contact with the inner surface 23 of the neck portion 22 of the container body 2, thereby sealing the inside of the container body. Further, in the inner surface 11 of the top surface portion 10, the region 12 facing the partition wall 51 is a concave dome shape that becomes a part of the spherical shell, and the region (hereinafter referred to as the central region 12) that surrounds the periphery of the region (hereinafter referred to as the central region 12) The peripheral region 13) is formed in a shape that contacts the upper surface of the flange 52 of the inner lid 5a. Further, a projection 19 projecting inward is formed on the inner surface on the upper end side of the tongue piece portion 17 formed in a part of the top wall portion 14, and the flange 52 of the inner lid 5 a is supported by the projection 19. ing. Thereby, the inner lid 5a is held inside the top wall 14 and is attached to the top 10. Further, the outer diameter of the flange 52 is smaller than the inner diameter of the top wall portion 14, and the inner lid 5a is held inside the top wall portion 14 with play. Thereby, even if the outer lid 10 and the inner lid 5a are not exactly coaxially arranged, the outer peripheral edge of the flange 52 is pressed against the inner surface of the top wall portion 14, and the plane of the flange 52 and the outer peripheral portion 53 continuous thereto. The shape does not deform. That is, the sealing degree of the container body 2 by the inner lid 5a does not decrease. A protrusion 15 that protrudes inward is also formed at the lower end of the tongue piece 17 of the top surface wall portion 14, and this protrusion 15 is engaged with the irregular shape of the neck portion 22 of the container body 2. As a result, the upper surface of the flange portion 52 of the inner lid 5 a comes into close contact with the peripheral region 13.
<Operation of inner lid>
Next, the operation of the inner lid 5a will be described. As shown in FIG. 4A, in the state where the cap 3 is mounted on the container body 2, the inner lid 5a has a flange 52 at the upper end surface 27 of the periphery of the opening 24 of the container body 2 and the peripheral region of the top surface portion 10. 13 and the outer surface 55 of the outer peripheral portion 53 is also in close contact with the inner surface 23 of the container body 2 as described above. Thereby, the opening 24 of the container body 2 is sealed in an airtight state. When the opening 24 is sealed, when the air between the upper surface 7 of the contents 6 and the lower surface 56 of the partition wall portion 51 is compressed and the internal pressure of the container body 2 increases, the partition wall portion 51 uses its peripheral edge 54 as a fulcrum. Elastically deforms. Specifically, the initial shape of the partition wall portion 51 is a dome shape with a deep bottom as shown by the chain line in the figure, but the lower surface 56 of the partition wall portion 51 is pushed upward by the increase in the internal pressure of the container body 2. And elastically deforms. In this example, the bottom is elastically deformed so as to have a shallow dome shape. That is, the increase in internal pressure is absorbed by expanding the volume of the closed space 8 formed by the upper surface 7 of the contents 6 and the lower surface 56 of the partition wall 51 in the container body 2.

  However, as shown in FIG. 4B, since the internal pressure of the container body 2 becomes extremely higher than the surrounding pressure in a reduced pressure environment, the partition wall portion 51 exceeds the upper end position of the outer peripheral portion 53 and protrudes upward. The upper surface 57 of the partition wall portion 51 comes into contact with the inner surface 11 of the top surface portion 10. Here, the height difference (hereinafter referred to as initial depth D) from the vertical position of the peripheral edge 54 of the partition wall 51 to the initial lower end of the partition wall 51 is the dome-shaped center of the top surface 10 from the upper end position of the peripheral edge 54 of the partition wall 51. When the difference in height to the highest point of the region 12 (hereinafter referred to as the top surface height H) is smaller, if the pressure difference between the inside and outside of the container body 2 is extremely large, the upper surface of the partition wall portion 51 after deformation from the upper end position of the peripheral edge 54 of the partition wall portion 51. There is a possibility that the difference in height (hereinafter referred to as deformation height h) up to the highest point of 57 exceeds the height of the same distance as the initial depth D and deforms. When the deformation height h is deformed beyond the same distance as the initial depth D, the partition wall portion 51 becomes larger than the initial surface area. However, since the peripheral edge 54 of the partition wall portion 51 is connected to the outer peripheral portion 53, a force in the direction of diameter reduction is applied to the flat cylindrical outer peripheral portion 53, and the outer surface 55 of the outer peripheral portion 53 and the inner surface 23 of the container body 2 May be reduced, and the contents 6 may leak due to a large pressure difference between the inside and outside of the container body 2.

Therefore, in the sealed container 1a according to the first embodiment, the top surface height H is the initial depth D or less (D ≧ H), and the deformation height h is always D or less. . Therefore, the original dome-shaped partition wall portion 51 protruding downward is deformed into a dome shape protruding upward, and the upper surface 57 of the partition wall portion 51 abuts against the inner surface 11 of the top surface portion 10 and conforms to the inner surface shape of the central region 12. Even if it is deformed, stress in the diameter reducing direction is not applied to the outer peripheral portion 53. That is, if the surface area of the upper surface 57 or the lower surface 56 of the partition wall portion 51 is small before and after the deformation, the outer peripheral portion 53 is applied with force only in the diameter increasing direction. Therefore, the outer surface 55 of the outer peripheral portion 53 tends to be in close contact with the inner surface 23 of the container body 2 as the partition wall portion 51 is deformed. Therefore, in the sealed container 1a according to the first embodiment, the structure for attaching the inner lid 5a and the inner lid 5a to the container body 2 is simple, but the leakage of the contents 6 is surely prevented even under a reduced pressure environment. can do. Of course, the partition part 51 which deform | transforms into an up-down direction is provided, and the opening 24 of the container main body 2 can be easily sealed in an airtight state by the inner lid 5a, or the attached inner lid 5a can be easily removed.
=== Second Embodiment ===
As shown in FIG. 4, in the sealed container 1a according to the first embodiment, when the cap 3 is in the closed state in which the cap body 3 is mounted, the peripheral region 13 of the top surface portion 10 of the cap 3 is the inner lid. Since it is in contact with the upper surface of the flange 52 of 5a, the dome-shaped central region 12 is sealed. In the closed state, the cap 3 in the first embodiment has a constant positional relationship with the container body 2 in the vertical direction, and the contact state between the lower surface 16 of the peripheral region 13 and the flange 52 is kept constant. . When the partition wall portion 51 is suddenly deformed upward and the air in the central region 12 is compressed, the air in the central region 12 escapes outward from the contact region between the flange 52 and the peripheral region 13, and the partition wall portion The deformation of 51 is rarely disturbed. Even when the pressure suddenly increases from the state in which the partition wall 51 is deformed upward, the air (outside air) outside the sealed container 1a flows into the central region 12 from the contact region between the flange 52 and the peripheral region 13. Thus, the downward deformation of the partition wall is hardly inhibited. In other words, the space between the central region 12 and the partition wall 51 and the outside air of the container body 2 can communicate with each other via the upper surface of the flange 52.

  However, if the cap 3 is pressed downward or the like, and the peripheral region 13 and the flange 52 are in a tight contact state, the air in the central region 12 may be difficult to escape outward. The same applies when the cap is a screw cap. In the screw cap, the contact state changes depending on the depth of screwing, and when the cap is tightened strongly, the screw cap strongly contacts and the communication path between the central region 12 and the outside air is blocked. When the communication path between the central region 12 and the outside air is interrupted, the partition wall 51 is difficult to deform. For example, when the sealed container 1a is placed in a reduced pressure environment after the partition wall 51 is deformed and the cap 3 is strongly pressed downward, the space formed by the central region 12 and the partition wall 51 is negative pressure. Is maintained. And even if the airtight container 1a returns to the atmospheric pressure environment as it is, outside air is not introduced into the central region, and the partition wall portion 51 cannot return to a dome-like state below. Therefore, as a second embodiment of the present invention, even when the peripheral region and the flange are in close contact, or even if the cap is firmly attached to the container body, such as a screw cap, An airtight container in which the partition wall can be smoothly deformed along with pressure fluctuation will be given.

  FIG. 5 shows the structure of the cap 103 of the sealed container according to the second embodiment. FIG. 5 shows an exploded perspective view of the cap 103 as viewed from below. The sealed container according to the second embodiment is the same as the sealed container of the first embodiment except for a part of the structure of the top surface portion 110. The structure and operation of the top surface portion 110 in the second embodiment will be described below.

As shown in FIG. 5, the cap 103 is configured by the top surface portion 110, the body portion 31, and the mounting mechanism 4, as in the first embodiment, but the cap 103 has a dome-shaped central region 12 and A vent 111 for communicating with outside air is formed. In this example, a groove 111 extending from the outer peripheral side of the central region 12 in the radial outward direction and crossing the peripheral region 13 to reach the outside of the top wall 14 is formed as a vent. In the cap 103, the outer side of the top wall portion 14 is the inner surface of the barrel portion 31, and communicates with the outside by a lower end opening of the barrel portion 31 and a hole 32 through which the push button 41 of the mounting mechanism 4 is led out. As described above, in the sealed container according to the second embodiment, air can enter and exit from the central region 12 through the vent 111, and the partition wall 51 can be smoothly deformed.
=== Other Embodiments ===
The container body may have any external shape or internal structure as long as the inner surface is in close contact with the outer surface of the outer peripheral portion in the region where the outer peripheral portion of the inner lid is inserted from the opening.

  The central region of the partition and the top surface of the inner lid may be a dome shape and need not be part of a spherical shell. For example, as in the case of the inner lid 5b shown in FIG. 6, the cross-sectional shape of the partition wall 51 may be corrugated, such as a shape in which the vicinity of the center of the partition wall 51 protrudes upward. Moreover, the peripheral edge 54 of the partition part 51 may be connected to the inner surface of the outer peripheral part 53 below the flange part like the inner lid 5c shown in FIG. In this example, the peripheral edge 54 of the partition wall portion 51 is connected to the lower end of the outer peripheral portion 53. In such an inner lid 5c, even if the height H of the top surface portion 10 is set to be equal to or less than the initial depth D of the partition wall portion 51, it is in an extremely severe environment in which the pressure in the container body rises rapidly and greatly. When an airtight container is placed, the partition wall is elastically deformed, and the speed cannot keep up with the rising speed of the internal pressure, and the degree of adhesion between the outer surface of the outer peripheral portion of the inner lid and the inner surface of the container body decreases, resulting in the contents being There is a possibility of leakage.

  FIG. 8 is a view showing a mechanism by which contents in the container main body leak due to the shape of the inner lid 5c shown in FIG. In the sealed container 1b shown here, the constituent members of the cap other than the top surface portion 210 are omitted. As shown in FIG. 8A, the pressure in the container body 2 rises and the partition wall 51 protrudes upward as shown in FIG. 8B, whereas the partition wall 51 protrudes downward. When deformed in this manner and brought into contact with the inner surface 11 of the top surface portion 210, even if D ≧ H, the peripheral edge 54 of the partition wall portion 51 is moved toward the lower end side of the outer peripheral portion 53 by the pressure indicated by the white arrow 101 in the figure. As shown by an arrow 102 in the figure, a force is applied in the direction of diameter reduction. When the increase in the internal pressure of the container body 2 is extreme, the deformation speed of the partition wall 51 cannot catch up with the increase in pressure, and the force in the direction of diameter reduction cannot be ignored. Then, as shown in FIG. 8C in which the inside of the circle 200 in FIG. 8B is enlarged, the lower end side of the outer peripheral portion 53 bends inward, and the outer surface 55 of the outer peripheral portion 53 and the inner surface 23 of the container body 2. The degree of adhesion decreases. 9, the peripheral portion of the dome-shaped central region 12 in the top surface portion 310 is formed so as to contact the upper surface of the peripheral portion 54 of the partition wall portion 51, as in the sealed container 1 c in which a part of the cap configuration shown in FIG. 9 is omitted. If this is the case, the entire area of the upper surface 57 of the partition wall 51 abuts against the inner surface 11 of the top surface 310 when the partition wall 51 is deformed into an upwardly convex shape. (FIG. 8, reference numeral 101) is not generated. In the case where the peripheral edge 54 of the partition wall portion 51 is connected to the peripheral surface of the outer peripheral portion 53 below the flange 52 as in the inner lid 5 c shown here, the top surface portion 310 is the peripheral portion of the central region 12. Therefore, the thickness of the top surface portion 310 differs greatly between the central region 12 and the peripheral region 13 that abuts against the upper surface of the flange 52. Therefore, when the top surface portion 310 is manufactured as an integrally molded product by injection molding, if the molding conditions are not strictly controlled, the so-called “sinking” in which the thickness of the portion where the thickness changes is reduced, and the aesthetic appearance may be impaired. There is sex. Therefore, ideally, the peripheral edge 54 of the partition wall portion 51 is desirably connected to the outer peripheral portion 53 at the upper end position of the flange 52.

  The inner surface shape of the central region is not limited to a simple spherical shell-shaped dome shape, and a flat cylindrical dome shape that opens downward is also conceivable. Moreover, it is good also as a dome shape with an unevenness | corrugation in an inner surface, such as the shape which passed the beam to the inner surface of the spherical shell. Even if the partition wall is deformed so as to follow the uneven shape, in principle, if the surface area of the deformed partition wall is equal to or less than the surface area of the upper surface or the lower surface of the partition wall in the initial state, the outer periphery is reduced. No force is applied to the diameter. Of course, unless the partition wall is made of a very soft material, even if it is deformed to the maximum extent, the surface shape of the upper surface cannot follow the uneven shape, and generally has a dome shape. Therefore, if the surface area of the central region facing the partition wall portion is equal to or less than the initial surface area of the partition wall portion, the diameter reduction of the outer peripheral portion of the inner lid due to the action shown in FIG. 8 can be prevented. If the inner surface of the central region has a shape that crosses the inner surface of the spherical shell, the surface area of the central region facing the partition wall is the area of the lower end surface of the beam and the sphere exposed between adjacent beams. If the total surface area is equal to or less than the initial surface area of the partition wall portion, the diameter of the outer peripheral portion can be prevented from being reduced.

  If the inner surface of the central region is shaped so that the surface area ratio before and after deformation of the partition wall is 1 or less, in principle, a force for reducing the diameter of the outer periphery of the inner lid is unlikely to be generated. However, for example, when the central region has a flat cylindrical dome shape that opens downward, there is a difference in height between the peripheral edge of the partition wall and the peripheral edge of the central region, and the outer peripheral portion is similar to the operation shown in FIG. There is also a possibility that the force in the direction of reducing the diameter cannot be ignored. Therefore, it is better to deform the partition wall so that it smoothly continues from the periphery to the inner surface shape of the central region. That is, it is desirable that the partition wall and the central region have a dome shape that smoothly goes from the center of the plane toward the periphery.

  In the second embodiment, a hole communicating with the central region may be formed in the top surface portion as a vent. In addition, when a vent is made into a hole, it can be said that it is more preferable to use a groove formed radially outward from the central region as a vent because there is a possibility that the hole is closed by hand when the cap is attached. . Note that the vent is not limited to the outer lid, but may be formed in the inner lid. For example, a groove extending radially outward can be formed on the upper surface of the flange portion, and the groove can be used as a vent. Of course, vents can be formed on both the outer lid and the upper surface of the flange portion.

The structure for engaging the cap with the container main body is not limited to the above embodiment, and for example, a screw cap method or the like is also conceivable. Of course, the outer lid does not need to be configured as a cylindrical cap or detachable, and may be a hinged outer lid such as a compact container. In any case, the difference in height between the peripheral position of the partition wall portion when the cap is closed and the upper end of the central region is equal to or lower than the difference in height between the lower end of the partition wall portion of the inner lid in the initial state and the peripheral position of the partition wall portion. The surface area of the central region may be equal to or less than the surface area of the upper surface of the partition wall in the initial state.

1a-1c Sealed container with inner lid, 2 container body, 3 outer lid (cap), 4 mounting mechanism, 5a-5c inner lid, 10, 110, 210, 310 top surface part, 11 inner surface of top surface part,
12 central region of the top surface portion, 13 peripheral portion of the top surface portion, 21 storage portion of the container body,
22 neck of the container body, 23 inner surface of the container body, 51 partition wall of the inner lid,
52 flange of the inner lid, 53 outer periphery of the inner lid, 54 peripheral edge of the partition wall,
55 outer surface of outer peripheral part, 56 lower surface of partition part, 57 upper surface of partition part,
111 Vent (groove)

Claims (6)

A sealed container with an inner lid comprising a bottomed container body having an opening on the upper side, an outer lid that covers the opening so as to be opened and closed, and an inner lid for sealing the container body in an airtight state,
In the inner lid, a partition wall portion that is easily elastically deformed with respect to the frame body is formed on the inner side of the frame body having a flange at an upper end. Adhering closely to the inner surface of the container body on the open end side,
The partition wall is formed in a dome shape protruding downward in an initial state where the inner lid is not attached to the container body, and is formed to be deformable into a dome shape protruding upward,
The outer lid has a central area formed of a dome-shaped recess inside the top surface and a peripheral area that circulates around the recess annularly, and the outer lid is mounted on the container body while the outer lid is mounted on the container. In the closed state covering the opening of the main body, the central region faces the partition wall portion and the peripheral region abuts on the upper surface of the flange portion,
The inner surface of the central region is formed in a shape that regulates the surface area of the partition wall in the deformed state to be equal to or less than the surface area of the partition wall in the initial state when the partition wall is deformed so as to protrude upward. Yes,
An airtight container with an inner lid characterized by the above.   The height difference between the peripheral position of the partition wall in the closed state and the upper end of the central region is not more than a height difference between the lower end of the partition wall and the peripheral position, and faces the partition wall. A sealed container with an inner lid, wherein a surface area of a central region is equal to or less than a surface area of an upper surface of the partition wall in the initial state.   3. The airtight container with an inner lid according to claim 1, wherein the inner lid has a shape in which a peripheral edge of the partition wall portion is connected to an inner peripheral upper end of the flange portion.   The airtight container with an inner lid according to any one of claims 1 to 3, further comprising a vent hole that communicates the central region with outside air.   5. The sealed container with an inner lid according to claim 4, wherein the vent is a radially extending groove formed in at least one of the peripheral region or the upper surface of the flange portion.   6. The container body according to claim 1, wherein the outer lid has a mounting mechanism that engages with an upper end surface shape of the container body on an inner side, and closes the opening at the top surface portion. An airtight container with an inner lid, which is attached to the container body by the attachment mechanism when pressed downward from above.

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