JP6375078B1 - Opening / closing mechanism, opening / closing method, and opening / closing structure - Google Patents

Abstract

An opening / closing operation of an opening / closing member is facilitated. An opening / closing mechanism that opens and closes an opening / closing member (6) of a container body (4) that is hermetically sealed by an elastic force of a sealing material (8) having a tube structure, and is a space formed inside the sealing material. A pressure reducing path (6b) for reducing the pressure in (8a) to a negative pressure is provided, and the opening and closing member is opened and closed in a state where the space is depressurized and the space is contracted via the pressure reducing path. [Selection] Figure 2

Description

  The present invention relates to an opening / closing mechanism for opening and closing a lid of a container, for example, an opening / closing method using the opening / closing mechanism, and an opening / closing structure constituting the opening / closing mechanism.

  Currently, in order to produce solid preparations such as tablets and powders in solid preparation factories such as pharmaceutical companies, it is essential to use containers for transporting and storing raw materials and intermediate products because the batch production method is fundamental. is there. In addition, the container is required to be airtight so that the solid preparation in the container does not deteriorate during storage.

  Here, in order to ensure the hermeticity of the container, the container is generally sealed by tightening the lid and the container main body with a clamp band via a packing (for example, see Patent Document 1). A robot that opens and closes a clamp band is known as a device that opens and closes the lid of a container sealed in this manner (see, for example, Non-Patent Document 1). In this robot, since the clamp band can be opened and closed without human intervention, the production line can be saved.

Utility Model Registration No. 31566962

OMC Corporation, “Robot Desorption System”, [online], [March 12, 2018 search], Internet <URL: http://omc.jpn.org/2012/product_medical/cross_mix/robotdesorptionsystem_medical.htm>

However, when the above-described general technique is used, there is a problem that at least three robots are required to automatically open and close the lid, which is too expensive.
In addition, manual operations are necessary to perform detailed operations when opening and closing the lid, but it is difficult to perform clamping tightening and releasing operations by a human because it is necessary to cope with the work of raising the clamp lever by the fingertips. It was.

  An object of the present invention is to provide an opening / closing mechanism, an opening / closing method, and an opening / closing structure that facilitate the opening / closing operation of the lid (opening / closing member) by simplifying the structure of sealing and releasing the container.

The present invention includes the following matters.
[1] An opening / closing mechanism that opens and closes an opening / closing member of a container body that is airtight by an elastic force of a sealing material having a tube structure,
A pressure reducing path for depressurizing the space formed inside the sealing material to obtain a negative pressure;
The opening / closing mechanism characterized in that the opening / closing member can be opened in a state in which the space is decompressed through the decompression path to become negative pressure and the space is contracted.
[2] A decompression unit that decompresses the space through the decompression path;
A moving part for moving the opening and closing member,
When opening the opening / closing member, the moving unit moves the opening / closing member from the opening of the container body in a state where the space is depressurized by the decompression unit to be a negative pressure ,
When the container body is closed, the moving unit moves the opening / closing member to close the opening, and the pressure reducing unit stops the pressure reduction after the opening is closed. The opening / closing mechanism described.
[3] The opening / closing mechanism according to [1] or [2], wherein the sealing material is detachably attached to one of the opening / closing member and the container body.
[4] The sealing material is
A contracted shape in which the fluid in the space is sucked through the decompression path and decompressed to become negative pressure ,
A fluid is sucked into the space through the decompression path and is formed to be elastically deformable to a restored shape restored from the contracted shape,
It is comprised so that the said container main body may be made into an airtight state by the said restored shape, and the said airtight state of the said container main body is cancelled | released by the said contraction shape, Any one of [1]-[3] characterized by the above-mentioned. Opening and closing mechanism.
[5] The sealant is attached to the container body, and is configured to engage the opening / closing member in the restored shape and to release the engagement in the contracted shape [4] ] The opening-and-closing mechanism as described in.
[6] The seal member is attached to the opening / closing member, and is configured to engage the container main body in the restored shape and to release the engagement in the contracted shape [4]. ] The opening-and-closing mechanism as described in.
[7] The opening / closing mechanism according to any one of [1] to [6], wherein the opening / closing member is a lid.
[8] The opening / closing mechanism according to any one of [1] to [7], wherein the sealing material includes a bending / extending portion that contracts and restores the space.
[9] An opening and closing method for opening and closing an opening and closing member of a container body that is airtight by an elastic force of a sealing material having a tube structure,
When opening the opening and closing member,
A depressurizing step of the negative pressure I vacuum lines formed inside the space of the sealing material,
An opening step of moving the opening and closing member in a state where the space is depressurized and becomes negative pressure, and the space is contracted,
When closing the opening and closing member,
A depressurizing step of the negative pressure followed by vacuum of the space,
In the state where the space is decompressed and becomes a negative pressure and contracted, a closing step of closing the opening of the container body with the opening and closing member,
A stopping step of stopping the decompression;
A sealing step in which the sealing material comes into close contact with the container body by restoring fluid from the space and the space is contracted, and the container body is hermetically sealed by the opening and closing member. How to open and close.
[10] An opening / closing structure for opening / closing an opening / closing member of the container body which is airtight by the elastic force of the sealing material having a tube structure,
A pressure reducing path for depressurizing the space formed inside the sealing material to obtain a negative pressure;
A holding portion for holding the sealing material is provided in either the container body or the opening / closing member,
An opening / closing structure in which the opening / closing member is opened and closed in a state where the space is decompressed and contracted to a negative pressure through the decompression path, and the seal member is held by the holding portion.

  According to the present invention, it is possible to provide an opening / closing mechanism, an opening / closing method, and an opening / closing structure that facilitate the opening / closing operation of the lid (opening / closing member).

It is a general | schematic perspective view which shows the container which concerns on embodiment. It is principal part sectional drawing which shows the principal part of the opening / closing mechanism which concerns on embodiment. In the opening / closing mechanism which concerns on embodiment, it is a schematic diagram which shows the state which opens and closes the cover of a container with an opening / closing robot. In the opening / closing mechanism according to the embodiment, it is a diagram for explaining a procedure for opening and closing the lid of the container by the opening / closing robot. In the opening-closing mechanism which concerns on embodiment, it is a figure which shows the state by which a sealing material is pressure-reduced when opening the cover of a container. In the opening-closing mechanism which concerns on embodiment, it is a figure which shows the state by which a sealing material is pressure-reduced when closing the cover of a container. It is sectional drawing of the sealing material which concerns on other embodiment. It is principal part sectional drawing which shows the principal part of the opening-closing mechanism which concerns on other embodiment. It is sectional drawing of the sealing material which concerns on other embodiment. It is principal part sectional drawing which shows the principal part of the opening-closing mechanism which concerns on other embodiment. It is principal part sectional drawing which shows the principal part of the opening / closing structure which concerns on other embodiment. It is principal part sectional drawing which shows the principal part of the opening / closing structure which concerns on other embodiment. It is principal part sectional drawing which shows the principal part of the opening / closing structure which concerns on other embodiment.

  Hereinafter, with reference to the drawings, the opening / closing mechanism according to the embodiment of the present invention will be described by taking as an example the case of opening and closing the lid of a small can for storing solid preparations such as tablets and powders in a solid preparation factory such as a pharmaceutical company. To do. FIG. 1 is a schematic perspective view showing a container according to an embodiment, and FIG. 2 is a cross-sectional view showing a main part of the container according to the present invention. As shown in FIG. 1, the container 2 is made of metal and includes a bottomed cylindrical container body 4 and a disk-shaped lid 6 (opening / closing member).

  On the side of the opening 4 a of the container body 4, a protruding portion 4 b having a substantially circular cross section that protrudes radially outward from the outer peripheral surface of the container body 4 is formed. Further, as shown in FIG. 2, a sealing material having a tube structure is formed on the outer peripheral edge of the lid 6, extending downward (toward the container body 4) and bent outward in the radial direction of the lid 6. A holding portion 6 a having a C-shaped cross section is formed to hold 8 so as to be positioned immediately below the outer peripheral edge of the lid 6. And the decompression path 6b mentioned later is standingly arranged in the predetermined position of the outer peripheral top surface of the lid | cover 6. As shown in FIG.

  The sealing material 8 is an elastically deformable member provided to make the container body 4 and the lid 6 airtight, and a space 8a is formed inside. The sealing material 8 is formed in an annular shape including an inner peripheral portion and an outer peripheral portion, and includes an annular flat surface portion 8b extending radially inward from the inner peripheral portion.

The decompression path 6b is inserted into the sealing material 8 from the top surface of the lid 6, and the decompression section 10c (see FIG. 3) to be described later and the space 8a of the sealing material 8 communicate with each other by the decompression path 6b.
The sealing material 8 has a contracted shape in which the fluid in the space 8a is sucked through the decompression path 6b and decompressed, and a restored shape in which the fluid is sucked into the space 8a through the decompression path 6b and restored from the contracted shape. It is formed to be elastically deformable. Further, the sealing material 8 is configured to make the container 2 in an airtight state in a restored shape and to release the airtight state of the container 2 in a contracted shape.

  In the present embodiment, the sealing material 8 is deformed into a contracted shape and a restored shape by bending and stretching the inner peripheral portion, so that the bending width is large, and a gap (between the protruding portion 4b and the sealing material 8 ( (Described later) can be reliably formed.

In the present embodiment, the sealing material 8 is disposed along the outer peripheral surface of the container body 4 when the lid 6 is closed, and the lid 6 is externally fitted to the container body 4. By disposing the sealing material 8 along the outer peripheral surface of the container main body 4, it is possible to prevent the preparation from collecting around the sealing material 8 when the container main body 4 is tilted to discharge the preparation.
The sealing material 8 is a rubber member formed of a rubber material such as silicone or ethylene / propylene / diene rubber (EPDM).

  FIG. 3 is a schematic diagram illustrating a state in which the lid 6 of the container 2 is opened and closed by the opening and closing robot 10 in the opening and closing mechanism according to the embodiment. As shown in FIG. 3, the lid 6 is opened and closed by placing the container 2 on the work table 12 by the opening and closing robot 10. The opening / closing robot 10 includes a holding part 10a for holding the container 2, an arm 10b for moving the container 2 held by the holding part 10a, a decompression part 10c and an opening / closing part 10d, and a guide 10e extending vertically. A vertical movement part 10f (moving part) that moves up and down on the lid 6 is provided.

  Here, the decompression unit 10c is attached to the decompression path 6b when the lid 6 is opened and closed, and decompresses the space 8a of the sealing material 8 through the decompression path 6b. Moreover, the opening / closing part 10d includes a suction cup or the like, and opens and closes the lid 6 by being attracted to the top surface of the lid 6.

  Next, a procedure for opening and closing the lid 6 of the container 2 by the opening / closing robot 10 will be described. First, as shown in FIG. 4, in the solid pharmaceutical factory, the opening / closing robot 10, the shelf 14 storing the containers 2, and the work table 12 are arranged at predetermined positions, respectively. Here, when the lid 6 of the container 2 is opened, as shown in FIG. 4A, the opening / closing robot 10 first moves the arm 10b, and the lid 6 displayed on the shelf 14 is closed by the grip portion 10a. Hold the container 2.

  Next, the open / close robot 10 moves the arm 10 b to transfer the container 2 onto the work table 12. At this time, the container 2 is sealed with a sealing material 8 as shown in FIG. Next, as shown in FIG. 4B, the open / close robot 10 lowers the vertical movement portion 10f along the guide 10e. Thereby, the opening / closing part 10d comes into contact with the top surface of the lid 6, and the decompression part 10c is mounted on the decompression path 6b.

  Next, as shown in FIG. 5B, the open / close robot 10 operates the decompression unit 10c to decompress the space 8a of the sealing material 8 (decompression process). Thereby, the air in the space 8a is sucked, the space 8a becomes negative pressure, the space 8a contracts, a gap is formed between the protruding portion 4b and the sealing material 8, and the close contact state between both is released. The lid 6 can be removed from the container body 4.

  In this state, the open / close robot 10 sucks the top surface of the lid 6 with the open / close section 10d, moves the vertical movement section 10f along the guide 10e, moves the lid 6 from the opening 4a of the container body 4, and moves the container 2 Open the lid 6 (opening step).

  On the other hand, when closing the lid 6 of the container 2, the open / close robot 10 transfers the container 2 with the lid 6 vacant, that is, the container main body 4, onto the work table 12, and places the top surface on the open / close unit 10 d directly above the container main body 4. The lid 6 that adsorbs is positioned. Next, the open / close robot 10 operates the decompression unit 10c in this state to decompress the space 8a of the sealing material 8 held by the holding unit 6a as shown in FIG. 6A (decompression step). . Thereby, the air in the space 8a is sucked, the space 8a becomes negative pressure, and the space 8a contracts.

  Next, as shown in FIG. 6 (b), the open / close robot 10 keeps the vertical movement portion 10f lowered along the guide 10e and covers the opening 6a of the container body 4 with the lid 6 (blocking step). In this case, since the space 8a contracts and the sealing material 8 is deformed, the operation of closing the lid 6 by the sealing material 8 hitting the overhanging portion 4b is not hindered. When the lid 6 is closed, the flat portion 8b is sandwiched between the lid 6 and the container body 4, so that contact between metals is avoided and generation of metal powder is suppressed. Mixing of powder can be prevented. When the lid 6 is put on the opening 4a of the container body 4 and the opening 4a is closed by the lid 6, the open / close robot 10 stops the decompression by the decompression unit 10c (stopping process). When the decompression by the decompression unit 10c is stopped, the fluid (outside air) flows into the space 8a via the decompression path 6b, whereby the space 8a is decompressed from the negative pressure state, and the cross-sectional shape of the sealing material 8 is restored. Restored to the state. For this reason, the overhang | projection part 4b and the sealing material 8 closely_contact | adhere, and the container main body 4 obstruct | occluded with the lid | cover 6 with the sealing material 8 will be in an airtight state (airtight process).

In this case, the sealing material 8 may be in close contact with the container body 4 by tightening the outer peripheral surface of the container body 4 with an elastic force.
According to the opening / closing mechanism of this embodiment, the structure for sealing and releasing the container 2 can be simplified by reducing the pressure of the space 8a of the sealing material 8 when the lid 6 is opened and closed. Can be made easier. Further, since no clamp band is used, the lid 6 can be opened and closed by a single opening / closing robot 10, and the cost of the robot placed in the solid sawmill can be reduced.

  Further, since the sealing material 8 is held by the holding portion 6a, it is possible to prevent the sealing material 8 from dropping from the lid 6 during the opening / closing operation. Furthermore, in this embodiment, since the sealing material 8 is detachably attached to the lid 6, it can be removed from the sealing material 8 and cleaned, and the cleaned sealing material 8 can be reused. it can.

  Moreover, since the lid 6 and the container body 4 do not directly contact each other, there is no contact between metals, and metal powder generation can be suppressed. In the above-described embodiment, the sealing material 8 does not necessarily have a substantially circular cross section. For example, as shown in FIG. 7, the sealing material 8 includes a first seal portion 20 having a substantially semicircular cross section that is held on the holding portion 6 a side, the first seal portion 20, and a space 8 a inside the first seal portion 20. The sealing material 18 comprised from the 2nd seal | sticker part 22 in which was formed may be sufficient.

  Here, the first seal portion 20 has a main body portion 20a having a substantially semicircular cross section and a protruding portion 20b protruding toward the second seal portion 22, and a constricted portion 20c is formed between the two. . In addition, the second seal portion 22 has an engagement portion 22a that engages with the constricted portion 20c at the outer peripheral portion located on the first seal portion 20 side, and a substantially half on the inner peripheral portion (the opposite side of the first seal portion 20). A recess 22b that is recessed in a circular shape, an inner protrusion 22c that protrudes toward the space 8a at the lower end, an outer protrusion 22d that protrudes outward from the space 8a, and a tension when the lid 6 is closed at the lower end of the recess 22b. The contact part 22e which closely_contact | adheres to the protrusion part 4b is provided.

  The first seal portion 20 is held by the holding portion 6 a, and the second seal portion 22 has a side surface of the outer peripheral portion in contact with the first seal portion 20 and an upper surface in contact with the lower surface of the outer peripheral edge of the lid 6. Therefore, the sealing material 18 is in a state in which the concave portion 22b, the close contact portion 22e, the inner protruding portion 22c, and the outer protruding portion 22d are released from the lid 6, and other portions are placed on the lid 6 and the holding portion 6a. It is in a restrained state.

  Here, the sealing material 18 is configured such that the inner projecting portion 22c and the outer projecting portion 22d can bend and stretch (bending and stretching portion), and by bending and stretching the inner projecting portion 22c and the outer projecting portion 22d that are the bending and stretching portions, The space 8a (seal material 18) contracts and restores.

  For example, when the space 8a is depressurized, as shown in FIG. 8A, the sealing member 18 moves the inner projecting portion 22c and the outer projecting portion 22d toward the space 8a so that the space 8a has a substantially triangular shape. Become. For this reason, a gap is formed between the close contact portion 22e and the overhang portion 4b, and the lid 6 can be attached to and detached from the container body 4.

  On the other hand, when the space 8a is not decompressed, as shown in FIG. 8B, the inner projecting portion 22c and the outer projecting portion 22d move downward so that the space 8a has a substantially rectangular shape. For this reason, if the sealing material 18 is changed from the contracted shape to the restored shape while the lid 6 is placed on the container body 4, the close contact portion 22 e comes into close contact with the overhang portion 4 b and the inside of the container main body 4 is sealed by the lid 6. Is done.

  Thus, when the sealing material 18 includes the inner projecting portion 22c and the outer projecting portion 22d as bending and extending portions, the outer projecting portion 22d rotates inwardly around the recess 22b when contracting. Then, it is drawn toward the decompression path 6b. Further, when the outer projecting portion 22d is restored, the outer projecting portion 22d rotates outwardly around the vicinity of the concave portion 22b and is separated from the decompression path 6b.

  The sealing material 18 is configured to be restored from the contracted state and at the same time accommodate the overhanging portion 4b in the recess 22b, and hold the overhanging portion 4b by the close contact portion 22e being in close contact with the overhanging portion 4b. Has been. With this configuration, the sealing material 18 and the container body 4 are firmly adhered by the restoration of the sealing material 18, and the airtightness of the container 2 can be improved. Further, when the seal member 18 is restored, the recess 22b approaches the overhanging portion 4b obliquely from above by the rotation of the outer protruding portion 22d so that the overhanging portion 4b is held, and the overhanging portion 4b is easily gripped. ing.

  Moreover, as shown in FIG. 9, the 1st seal | sticker part 20 and the 2nd seal | sticker part may not be divided | segmented, and may be integral. The sealing material 18 ′ has a cross-sectional shape similar to that of the sealing material 18, but includes a rectangular portion 24 having a substantially rectangular cross section instead of the first sealing portion 20, and is cut at a lower end portion of the rectangular portion 24. A notch 24a is provided. Further, an engagement portion 22f that closes the space 8a by being engaged with the notch portion 24a is provided on the rectangular portion 24 side of the inner protruding portion 22c. As shown in FIGS. 10A and 10B, the sealing material 18 ′ may be installed in a holding portion 6 a ′ having a U-shaped cross section corresponding to the shape of the rectangular portion 24.

  Further, in the opening / closing structure of the above-described embodiment, the sealing material 8 may be mounted on the container body 4 side. For example, as shown in FIG. 11, a projecting portion 6x having a substantially circular cross section projecting downward is formed on the outer peripheral edge of the lid 6 '. On the other hand, an overhanging portion 4x that protrudes greatly to the outside of the opening 4a of the container body 4 is formed, extends upward further to the outside of the overhanging portion 4x, and bends outward in the radial direction of the container body 4 And the holding | maintenance part 4y holding the annular | circular shaped sealing material 8 is formed. In this case, since the lower end side supports the sealing material 18 ′, the holding portion 4y can reliably hold the sealing material 8 so that the sealing material 8 does not fall off.

  In the above-described embodiment, the sealing material 8 may not be attached to either the lid 6 or the container body 4. For example, as shown in FIG. 12, a sealing material 8 may be sandwiched between the lid 6 ′ and the container body 4.

  Moreover, in the above-mentioned embodiment, although the case where a lid | cover is attached to the container main body 4 as an opening / closing member was demonstrated to the example, a lid | cover does not necessarily need to be an opening / closing member. For example, as shown in FIG. 13, a funnel 26 may be attached to the container body 4 instead of the lid. In this case, a holding portion 6a for holding the sealing material 8 is formed on the outer periphery of the opening having the larger diameter.

  In the above-described embodiment, the case where the lid 6 is opened and closed by the opening and closing robot 10 has been described, but the present invention is not limited to this. For example, the lid 6 may be manually opened and closed by an operator. In this case, the nozzle of the hose connected to a predetermined decompression (suction) means as the decompression unit 10c may be the decompression unit 10c. Then, the pressure reducing part 10c may be manually connected to the pressure reducing path 6b, and the sealing material 8 may be contracted by sucking the fluid in the sealing material 8.

  In the above-described embodiment, the case where the sealing material 8 is disposed along the outer peripheral surface of the container body 4 when the lid 6 is closed has been described, but the present invention is not limited to this. The sealing material 8 may be disposed along the inner peripheral surface of the container body 4 when the lid 6 is closed.

  In the above-described embodiment, the sealing material 8 has been described with respect to the case where the inner peripheral portion bends and stretches, but is not limited thereto. For example, when the sealing material 8 is disposed along the inner peripheral surface of the container body 4 (that is, in the case of internal fitting), the outer peripheral portion may be configured to bend and stretch. In this case, as in the case where the inner peripheral portion bends and stretches, a gap can be reliably formed between the protruding portion 4b and the sealing material 8. Moreover, the sealing material 8 may be comprised so that both an inner peripheral part and an outer peripheral part may bend and stretch.

2 Container 4 Container body 4a Opening 4b Overhanging portion 6 Lid 6a Holding portion 6b Pressure reducing path 8 Sealing material 8a Space 8b Planar portion 10 Opening and closing robot 10a Holding portion 10b Arm 10c Pressure reducing portion 10d Opening and closing portion 10e Guide 10f Vertical moving portion 12 Work table 14 Shelf 18 Sealing material 20 First seal portion 20a Main body portion 20b Protruding portion 20c Constricted portion 22 Second seal portion 22a Engaging portion 22b Recessing portion 22c Inner protruding portion 22d Outer protruding portion 22e Adhering portion 22f Engaging portion 24 Rectangular portion 24a Cutting Notch 26 funnel

Claims (10)

An opening / closing mechanism for opening / closing an opening / closing member of the container body which is airtight by an elastic force of a sealing material having a tube structure,
A pressure reducing path for depressurizing the space formed inside the sealing material to obtain a negative pressure;
The opening / closing mechanism characterized in that the opening / closing member can be opened in a state in which the space is decompressed through the decompression path to become negative pressure and the space is contracted. A decompression section for decompressing the space via the decompression path;
A moving part for moving the opening and closing member,
When opening the opening / closing member, the moving unit moves the opening / closing member from the opening of the container body in a state where the space is depressurized by the decompression unit to be a negative pressure ,
The said moving part moves the said opening-and-closing member, and closes the said opening when closing the said container main body, The said pressure reduction part stops pressure reduction, after the said opening is closed. The opening / closing mechanism described.   The opening / closing mechanism according to claim 1, wherein the sealing material is detachably attached to one of the opening / closing member and the container body. The sealing material is
A contracted shape in which the fluid in the space is sucked through the decompression path and decompressed to become negative pressure ,
A fluid is sucked into the space through the decompression path and is formed to be elastically deformable to a restored shape restored from the contracted shape,
The container body is airtight with the restored shape, and the container body is configured to release the airtight state of the container body with the contracted shape. Opening and closing mechanism.   The said sealing material is attached to the said container main body, It is comprised so that it may engage with the said opening-and-closing member in the said restored shape, and the said engagement may be cancelled | released by the said contraction shape. Opening and closing mechanism.   The said sealing material is attached to the said opening-and-closing member, It is comprised so that it may engage with the said container main body by the said restored shape, and the said engagement will be cancelled | released by the said contraction shape. Opening and closing mechanism.   The opening / closing mechanism according to claim 1, wherein the opening / closing member is a lid.   The opening / closing mechanism according to any one of claims 1 to 7, wherein the sealing material includes a bending / extending portion that contracts and restores the space. An opening and closing method for opening and closing an opening and closing member of a container body that is airtight by an elastic force of a sealing material having a tube structure,
When opening the opening and closing member,
A depressurizing step of the negative pressure I vacuum lines formed inside the space of the sealing material,
An opening step of moving the opening and closing member in a state where the space is depressurized and becomes negative pressure, and the space is contracted,
When closing the opening and closing member,
A depressurizing step of the negative pressure followed by vacuum of the space,
In the state where the space is decompressed and becomes a negative pressure and contracted, a closing step of closing the opening of the container body with the opening and closing member,
A stopping step of stopping the decompression;
A sealing step in which the sealing material comes into close contact with the container body by restoring fluid from the space and the space is contracted, and the container body is hermetically sealed by the opening and closing member. How to open and close. An opening and closing structure for opening and closing the opening and closing member of the container body which is airtight by the elastic force of the sealing material having a tube structure,
A pressure reducing path for depressurizing the space formed inside the sealing material to obtain a negative pressure;
A holding portion for holding the sealing material is provided in either the container body or the opening / closing member,
An opening / closing structure in which the opening / closing member is opened and closed in a state where the space is decompressed and contracted to a negative pressure through the decompression path, and the seal member is held by the holding portion.

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