Double container and its use

Abstract

To provide a double container that can improve thermal insulating properties.SOLUTION: A double container includes a resin-made inner container and resin-made outer container. The double container is provided in which the inner container has an inner container body, the container body is arranged inside of the outer container, and a space is formed between the outer surface of the container body and the inner surface of the outer container. The double container is structured so that the space can be decompressed additionally.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a double container.

Background Art

[0002] Patent Document 1 discloses a double container including a container body for containing contents, the container body having an inner container and an outer container. In the double container of Patent Document 1, a space as a heat insulating layer is formed between the inner container and the outer container, improving the heat insulation between the outside air and the contents.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the double container of Patent Document 1, although a space is formed as a heat insulating layer, there is a problem that since air exists in the space, the heat insulation is impaired accordingly.

[0005] The present invention has been made in view of such circumstances, and an object thereof is to provide a double container capable of improving heat insulation.

Means for Solving the Problems

[0006] [[ID=4�]] According to the present invention, there is provided a double container including a resin inner container and a resin outer container, the inner container having an inner container body, the inner container body being disposed inside the outer container, and a space being formed between the outer surface of the inner container body and the inner surface of the outer container, the double container being configured to be additionally depressurized in the space.

[0007] According to the present invention, since the double container is configured to be able to decompress the space between the outer surface of the inner container body and the inner surface of the outer container, the air existing in the space can be reduced, and the heat insulation performance can be improved. Further, although the inner container and the outer container are made of resin, when the constituent resins of the inner container and the outer container are made of a material that permeates gas, the air pressure in the space can increase little by little. However, in the present invention, since the space can be additionally decompressed, even under such conditions, the heat insulation performance can be improved.

[0008] Hereinafter, various embodiments of the present invention will be exemplified. The embodiments shown below can be combined with each other. Preferably, the inner container and the outer container are separate bodies, the inner container further has a protruding portion, the protruding portion is formed so as to protrude outward in the radial direction of the inner container, and is supported by the outer container, and a double container is provided. Preferably, it further includes an inner lid, the inner lid has an engaging lid portion and an insertion cylinder portion, the engaging lid portion is placed on the upper parts of the outer container and the inner container, and is configured to be engageable with the outer surface of the outer container, and the insertion cylinder portion is inserted into the inner container in a state where the outer surface of the outer container and the engaging lid portion are engaged, and a double container is provided. Preferably, the inner container further has an annular rib, and the annular rib is formed on the outer surface of the inner container body, and a double container is provided. Preferably, it further includes a valve member, the valve member is provided on the outer container, and a double container is provided that can additionally decompress the space by opening and closing.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Mode for Carrying Out the Invention

[0010] Hereinafter, embodiments will be described with reference to the drawings. In the drawings, the dashed-dotted line indicates a portion where the radius of curvature changes among various shapes. Various characteristic matters shown in the following embodiments can be combined with each other. Also, an invention can be established independently for each characteristic.

[0011] As shown in FIGS. 1 and 2, the double container 100 includes an inner container 1, an outer container 2, a middle lid 3, an outer lid 4, and a valve member 5. Further, in a state where the inner container 1 is disposed inside the outer container 2, a space Sp is formed between the inner container 1 and the outer container 2. The double container 100 is configured to be able to additionally decompress the space Sp.

[0012] "Additional depressurization possible" means that after forming the space Sp, which is a sealed space, the user can operate a depressurization means (for example, a suction pump) to discharge the air in the space Sp and maintain the air pressure in the space Sp in the discharged state. Specifically, the user assembles the inner container 1 and the outer container 2 (places the inner container 1 inside the outer container 2), and attaches the valve member 5 to the outer container 2 to form the space Sp, which is a sealed space. Then, the user opens the valve member 5 and exhausts the air in the space Sp, which is a sealed space, with a suction pump (not shown), and then closes the valve member 5. Thereby, the state in which the space Sp is depressurized can be maintained. Thus, the double container 100 is configured such that after forming the space Sp, which is a sealed space, the space Sp can be depressurized and additional depressurization is possible. In addition, if the user desires to further depressurize, the valve member 5 may be opened again and the air in the space Sp may be exhausted with a suction pump. Thereby, the user can appropriately adjust the degree of depressurization of the space Sp.

[0013] In addition, when separating the inner container 1 and the outer container 2, it is preferable that the pressure inside the space Sp is at atmospheric pressure. In this case, by the user opening the valve member 5, the air pressure inside the space Sp can be easily increased.

[0014] The inner container 1, the outer container 2, the middle lid 3, and the outer lid 4 can be manufactured by injection molding. Although the inner container 1 may be manufactured by injection blow molding, since a wall thickness difference is likely to occur, it is preferably manufactured by injection molding.

[0015] <Inner container 1> As shown in FIGS. 2, 3, 5A, and 5B, the inner container 1 is a solid cylindrical member configured to be able to store the contents and is made of a transparent resin. The content volume of the inner container 1 can be, for example, 200 to 300 ml, but is not particularly limited to this volume. The inner container 1 includes an inner container body 1A, a protruding portion 1B, and an annular rib 1C.

[0016] The inner container body 1A includes a cylindrical (circular cylindrical in the embodiment) body portion 1A1 and a bottom portion 1A2. An annular rib 1C is connected to the body portion 1A1. The body portion 1A1 is formed in a circular cylindrical shape and extends parallel to the vertical direction. The bottom portion 1A2 is connected to the lower end portion of the body portion 1A1. Further, the bottom portion 1A2 is formed in a bowl shape and faces the bottom portion 2A2 and the valve member 5 of the outer container 2 described later.

[0017] Note that the wall thickness of the inner container body 1A is, for example, 3 (mm), but it is not limited thereto. Specifically, the wall thickness (mm) of the inner container body 1A is, for example, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, and it may be within the range between any two of the numerical values exemplified here.

[0018] The protrusion 1B is formed so as to protrude outward of the inner container 1 in the radial direction of the inner container 1, and the protrusion 1B is formed in an annular shape (circular annular shape in the embodiment). Further, the protrusion 1B is a portion supported by the outer container 2. A packing 6B is placed on the upper surface of the protrusion 1B, and a packing 6A is provided on the lower surface of the protrusion 1B. In a state where the inner container 1 is housed in the outer container 2, only the portion of the inner container 1 where the protrusion 1B is located is supported by the outer container 2 via the packing 6A, and the other portions of the inner container 1 do not contact the outer container 2. In the embodiment, the protrusion 1B is connected to the upper end portion of the inner container body 1A (body portion 1A1).

[0019] The annular ribs 1C are each formed on the upper side and the lower side of the body portion 1A1. The annular ribs 1C are formed in an annular shape (circular annular shape in the embodiment) in the circumferential direction of the body portion 1A1. The annular ribs 1C are formed on the outer surface (outer circumferential surface) of the body portion 1A1. By forming the annular ribs 1C, breakage of the inner container 1 can be suppressed. Here, for example, it is assumed that the space Sp is used in a state where it is not depressurized. In such a case, the air pressure in the space Sp may be higher than the air pressure in the inner container 1. In such a case, pressure is applied to the inner container 1 in a direction in which it is recessed, and breakage of the inner container body 1A is likely to be induced. However, since the annular ribs 1C are formed on the inner container body 1A, breakage of the inner container body 1A can be effectively suppressed.

[0020] <Outer container 2> As shown in FIGS. 2 to 4B, the outer container 2 is a separate body from the inner container 1 and is configured to be separable from the inner container 1. For this reason, the cleaning performance of the double container 100 is improved. Further, since the outer container 2 is a separate body from the inner container 1, if one of the inner container 1 and the outer container 2 is damaged, only the damaged one needs to be replaced, and the convenience of the double container 100 is enhanced.

[0021] The outer container 2 is a solid cylindrical member configured to be able to accommodate the inner container 1 and is made of a transparent resin. Since both the inner container 1 and the outer container 2 of the double container 100 are transparent, the user can confirm the contents from the outside of the double container 100. The outer container 2 includes an outer container body 2A, a support portion 2B, and an engaging portion 2C.

[0022] The outer container body 2A includes a cylindrical (circular cylindrical in the embodiment) body portion 2A1 and a bottom portion 2A2. An opening 2A3 (see FIG. 4B) for attaching the valve member 5 is formed in the bottom portion 2A2, and the opening is closed by the valve member 5. An engaging portion 2C is formed on the outer peripheral surface of the body portion 2A1. The body portion 2A1 is formed in a circular cylindrical shape and extends parallel to the vertical direction. Also, in the vicinity of the opening of the body portion 2A1 of the outer container 2 (the portion for inserting the inner container 1) and in the vicinity of the opening of the body portion 1A1 of the inner container 1 (the inlet for the contents), a reduced-diameter shape (shoulder portion) is not formed, and both the body portion 2A1 and the body portion 1A1 extend parallel to the vertical direction (extend linearly). Therefore, the user can easily insert and remove the inner container 1 from the outer container 2, and disassembly and assembly are easy. The bottom portion 2A2 is connected to the lower end portion of the body portion 2A1. The bottom portion 2A2 is formed to be convex upward and faces the bottom portion 1A2 of the inner container 1.

[0023] Note that the wall thickness of the outer container body 2A is, for example, 3 (mm), but it is not limited thereto. Specifically, the wall thickness (mm) of the outer container body 2A is, for example, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, and it may be within the range between any two of the values exemplified herein.

[0024] The space Sp shown in FIG. 3 is formed between the inner container 1 and the outer container 2. In a state where the inner container 1 is accommodated in the outer container 2, the gap between the protruding portion 1B, the support portion 2B, and the packing 6A disappears, and the space Sp becomes a sealed space (closed space). This space Sp is formed between the outer surface of the inner container body 1A and the inner surface of the outer container body 2A. More specifically, the space Sp is formed so as to be surrounded by the outer surface of the inner container body 1A, the lower surface of the protruding portion 1B, and the inner surface of the outer container body 2A. The air in the space Sp is discharged through the valve member 5.

[0025] The support portion 2B is formed so as to project outward of the outer container 2 in the radial direction of the outer container 2, and the support portion 2B is formed in an annular shape (circular annular shape in the embodiment). The support portion 2B is configured such that the packing 6A can be placed thereon, and supports the protruding portion 1B via the packing 6A. In the embodiment, the support portion 2B is connected to the upper end portion of the outer container main body 2A (barrel portion 2A1).

[0026] The engaging portion 2C is configured to be engageable with the middle lid 3. In the embodiment, the engaging portion 2C is formed in a spiral shape so as to be screwed with the middle lid 3.

[0027] <Middle lid 3> As shown in FIGS. 2, 3, 6A, and 6B, the middle lid 3 is separate from the inner container 1 and the outer container 2, and is configured to be separable from the inner container 1 and the outer container 2. The middle lid 3 is attached so as to cover the upper portions of the inner container 1 and the outer container 2. The middle lid 3 includes an engaging lid portion 3A and an insertion cylinder portion 3B.

[0028] As shown in FIG. 3, the engaging lid portion 3A is configured to cover the upper portions of the inner container 1 and the outer container 2 and to be engageable with the outer surface of the outer container 2. The engaging lid portion 3A includes an upper surface portion 3A1, a cylinder portion 3A2, and an engaging portion 3A3.

[0029] As shown in FIGS. 6A and 6B, the upper surface portion 3A1 is formed in a flat plate shape. The inner edge of the upper surface portion 3A1 is connected to the insertion cylinder portion 3B, and the outer edge of the upper surface portion 3A1 is connected to the cylinder portion 3A2. A packing 6B is provided on the lower surface of the upper surface portion 3A1. Below the upper surface portion 3A1, a packing 6B, a protruding portion 1B, a packing 6A, and a support portion 2B are arranged. Therefore, when the engaging portion 3A3 of the middle lid 3 is engaged with the engaging portion 2C of the outer container 2, the upper surface portion 3A1 presses the packing 6B, the protruding portion 1B, and the packing 6A against the support portion 2B. As a result, the packing 6A is deformed so as to be crushed, ensuring the airtightness of the space Sp, and the packing 6B is deformed so as to be crushed, improving the airtightness of the space inside the inner container 1. That is, when the user attaches the middle lid 3 to the outer container 2, both the airtightness of the space Sp and the airtightness of the space inside the inner container 1 are ensured.

[0030] As shown in FIGS. 3 and 6B, the cylinder portion 3A2 is formed in a cylindrical shape. Then, when the user grips the outer peripheral surface of the cylinder portion 3A2 and applies a rotational force, the engagement between the middle lid 3 (engaging portion 3A3) and the outer container 2 (engaging portion 2C) is released, and the middle lid 3 is removed from the outer container 2. The engaging portion 3A3 is formed on the inner peripheral surface of the cylinder portion 3A2. The engaging portion 3A3 is configured to be engageable with the engaging portion 2C of the outer container 2. The engaging portion 3A3 is formed in a spiral shape so as to be screwed with the outer container 2.

[0031] As shown in FIG. 3, the insertion cylinder portion 3B is inserted into the inner container 1 in a state where the engaging portion 2C of the outer container 2 and the engaging portion 3A3 of the engaging lid portion 3A are engaged. The insertion cylinder portion 3B is formed in a cylindrical shape (cylindrical shape in the embodiment) and is provided so as to communicate with the inside of the inner container 1. The insertion cylinder portion 3B includes an upper cylinder portion 3B1, an engaging portion 3B2, and a lower cylinder portion 3B3.

[0032] As shown in FIG. 6A, the upper cylinder portion 3B1 is provided so as to protrude upward from the upper surface portion 3A1, and an engaging portion 3B2 is formed on the outer peripheral surface of the upper cylinder portion 3B1. The engaging portion 3B2 is configured to be engageable with the outer lid 4. In the embodiment, the engaging portion 3B2 is formed in a spiral shape so as to be screwed with the outer lid 4. As shown in FIG. 3, the lower cylindrical portion 3B3 is provided so as to protrude downward from the upper surface portion 3A1, and the lower cylindrical portion 3B3 is configured to be insertable into the upper portion of the body portion 1A1 of the inner container 1. In a state where the lower cylindrical portion 3B3 is inserted into the body portion 1A1, preferably, the inner peripheral surface of the body portion 1A1 and the outer peripheral surface of the lower cylindrical portion 3B3 are in contact with each other. Thereby, the airtightness of the space composed of the inside of the inner container 1 and the inside of the insertion cylindrical portion 3B is improved. The lower cylindrical portion 3B3 may be in contact with the inner peripheral surface of the body portion 1A1 over the entire circumference of the outer peripheral surface, but is not limited thereto. For example, a gap may be formed in part so that the lower cylindrical portion 3B3 can be easily inserted into and removed from the body portion 1A1.

[0033] In the embodiment, the wall thickness of the lower cylindrical portion 3B3 is thinner than the wall thickness of the upper cylindrical portion 3B1. The wall thickness of the upper cylindrical portion 3B1 is, for example, 3 (mm), but is not limited thereto. Specifically, the wall thickness (mm) of the upper cylindrical portion 3B1 is, for example, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, and may be within the range between any two of the values exemplified here. The wall thickness of the lower cylindrical portion 3B3 is, for example, 1.5 (mm), but is not limited thereto. Specifically, the wall thickness (mm) of the lower cylindrical portion 3B3 is, for example, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, and may be within the range between any two of the values exemplified here.

[0034] <Outer lid 4> As shown in FIGS. 2 and 3, the outer lid 4 is configured to close the opening of the insertion cylinder portion 3B. The outer lid 4 is formed in a bowl shape, and an engaging portion 4A is provided on the inner peripheral surface of the outer lid 4. The engaging portion 4A is formed in a spiral shape so as to be screwed with the engaging portion 3B2 of the upper cylinder portion 3B1. Further, a packing 6C is detachably attached to the outer lid 4.

[0035] <Valve member 5> As shown in FIGS. 3 and 7, the valve member 5 is constituted by a check valve. That is, the valve member 5 has a function of preventing the air outside the double container 100 (the high-pressure side space) from flowing into the space Sp (the low-pressure side space). When the user attaches a suction pump (not shown) to the valve member 5 and performs a suction operation, the valve member 5 is in an open state, and the air in the space Sp is exhausted. In the embodiment, the valve member 5 has the following configuration.

[0036] As shown in FIG. 7, the valve member 5 includes a body 5A, a valve body 5B, and a spring 5C. The body 5A is attached to the outer container 2 by being inserted into the opening 2A3. In the embodiment, the body 5A is attached to the outer container 2 by being press-fitted into the opening 2A3, and the valve member 5 is configured to be separable from the outer container 2. Note that the body 5A may be attached to the outer container 2 by, for example, screwing with the inner peripheral surface of the opening 2A3. The body 5A has a suction hole 5A1, a placement surface portion 5A2, and a valve seat 5A3. The suction hole 5A1 is formed so as to penetrate the body 5A in the vertical direction. The lower end portion of the spring 5C is disposed on the placement surface portion 5A2. The valve seat 5A3 is where the valve body 5B is disposed. When a suction pump is attached to the suction hole 5A1 and a suction operation is performed, the valve body 5B moves downward from the position of the valve seat 5A3, a gap is formed between the outer side surface of the valve body 5B and the valve seat 5A3, and the air in the space Sp is exhausted.

[0037] The valve body 5B is provided inside the body 5A and is movably provided in the vertical direction. The valve body 5B has a function of closing the suction hole 5A1 of the body 5A. An engaging portion 5B1 is formed at the tip of the valve body 5B. The upper end of the spring 5C is disposed at the engaging portion 5B1. The lower end of the spring 5C is provided at the placement surface portion 5A2, and the upper end is provided at the engaging portion 5B1. The spring 5C has a function of urging the valve body 5B upward. Due to the action of the spring 5C, the valve body 5B closes the suction hole 5A1.

[0038] In this way, the double container 100 is configured to be able to decompress the space Sp by including the valve member 5. Therefore, the double container 100 can reduce the air existing in the space Sp and improve the heat insulation performance of the double container 100. Further, although the inner container 1 and the outer container 2 are made of resin, when the constituent resins of the inner container 1 and the outer container 2 are made of a material that permeates gas, the air pressure in the space Sp can increase little by little. However, since the double container 100 can additionally decompress the space Sp, even if the air pressure in the space Sp rises and the heat insulation performance is impaired, the heat insulation performance can be improved again.

[0039] Here, it will be described because it has been confirmed that there is a difference in the temperature of the contents in the inner container 1 between the case where the space Sp is at atmospheric pressure (the following case 1) and the case where the space Sp is decompressed (the following case 2). The contents common to both case 1 and case 2 are as follows. That is, 150 g of water at 0 °C was put into the inner container 1 as the contents. Also, 100 g of cubic ice with a size of about 30 mm to 40 mm was put into the inner container 1. Then, the outer lid 4 was closed. At the stage when the outer lid 4 was closed, the measurement of the temperature of the contents was started. In case 1, the space Sp was set at atmospheric pressure (1 atm), and in case 2, the space Sp was decompressed to 0.05 atm. In Case 1, the temperature starts to rise around 2 hours after the start of measurement, while in Case 2, it was confirmed that the temperature starts to rise around 2 hours and 40 minutes after the start. Then, in Case 1, the temperature rises to about 8°C after 3.5 hours, while in Case 2, it takes 4.5 hours for the temperature to rise to the same about 8°C, and it was confirmed that the difference between the two expands to about 1 hour. This difference further expands as time passes. Thus, the double container 100 according to the embodiment is configured to be able to decompress the space Sp, and the cold insulation performance can be improved.

[0040] <Packings 6A to 6C> The packings 6A to 6C shown in FIGS. 2 and 3 are resin-made annular members. The packing 6A is provided so as to be interposed between the protruding portion 1B and the support portion 2B. The packing 6A improves the airtightness of the space Sp. The packing 6B is provided so as to be interposed between the lower surface of the upper surface portion 3A1 of the middle lid 3 and the upper surface of the protruding portion 1B of the inner container 1. The packing 6B prevents the contents in the inner container 1 from flowing out through the gap between the middle lid 3 and the inner container 1. The packing 6C is provided so as to be interposed between the upper end portion of the insertion cylinder portion 3B of the middle lid 3 and the lower surface of the outer lid 4. The packing 6C prevents the contents in the inner container 1 from flowing out through the gap between the middle lid 3 and the outer lid 4.

[0041] <Regarding the constituent resin, etc. of each member> The inner container 1 and the outer container 2 can be made of, for example, PET resin so as to be easily recyclable. Also, the inner container 1 and the outer container 2 can be made of Tritan (TRITAN: registered trademark) resin.

[0042] <Other embodiments> In the embodiment, the valve member 5 has been described as having the configuration shown in FIG. 7, but the present invention is not limited thereto, and the valve member 5 may have the configuration shown in FIG. 8. In FIG. 8, the body 5A of the valve member 5 includes two parts (the first part 51 and the second part 52). The first part 51 is press-fitted into the opening 2A3 and attached to the outer container 2. Inside the first part 51, a spherical valve body 5B and a spring 5C are arranged. The second part 52 is detachably engaged with the first part 51, and an arrangement surface portion 5A2 is provided on the upper surface of the second part 52. The suction hole 5A1 is formed so as to communicate the central part of the first part 51 and the central part of the second part 52. The spring 5C is provided on the arrangement surface portion 5A2 of the second part 52 and biases the spherical valve body 5B.

[0043] In the embodiment, the valve member 5 has been described as including an elastic member (spring 5C), but the present invention is not limited thereto, and the valve member 5 may not include an elastic member. The valve member 5 may have, for example, a gripable cock, and may include a mechanism in which the valve body opens and closes when the user turns the cock by hand. Even in such a form, the double container 100 can be additionally depressurized. That is, the user assembles the inner container 1 and the outer container 2, attaches the valve member 5 to the outer container 2, turns the valve member 5 to a closed state, and makes the space Sp a sealed space. Then, a suction pump is attached to the valve member 5, the cock of the valve member 5 is opened to an open state, and the air in the space Sp can be discharged by operating the suction pump. After the decompression of the space Sp is completed to the extent desired by the user, the user turns the cock of the valve member 5 to a closed state. Thereby, the space Sp becomes a sealed state again, and the depressurized state of the space Sp is maintained.

[0044] A gas barrier layer is formed on at least one of the inner and outer surfaces of the inner container 1, and a gas barrier layer may also be formed on at least one of the inner and outer surfaces of the outer container 2. This gas barrier layer is made of a material with higher gas barrier properties than the resin constituting the inner container 1 or the outer container 2, and can be formed, for example, by a DLC coating layer. By forming the gas barrier layer on the inner container 1 and the outer container 2, it is possible to suppress the permeation of gas through the inner container 1 and the outer container 2 themselves, and to suppress the increase in the air pressure in the space Sp and the impairment of the heat insulation performance.

[0045] Although the protruding portion 1B has been described as being connected to the upper end portion of the inner container body 1A, it is not limited thereto. The protruding portion 1B may be connected below the upper end portion of the inner container body 1A. Also, although the support portion 2B has been described as being connected to the upper end portion of the outer container body 2A, it is not limited thereto. The support portion 2B may be formed in an annular shape at a position below the upper end portion of the inner peripheral surface of the body portion 2A1 of the outer container body 2A.

[0046] The engaging portion 2C, the engaging portion 3A3, the engaging portion 3B2, and the engaging portion 4A have been described as having a screwing structure, but are not limited thereto. For example, they may be engaged in a claw structure form.

[0047] In the embodiment, the annular rib 1C does not contact the outer container 2 (the inner surface of the outer container body 2A to be described later), but is not limited thereto. Although the heat insulation performance between the outside air and the contents is impaired, for example, a part or the whole of the periphery of the annular rib 1C may contact the outer container 2. When the whole periphery of the annular rib 1C contacts the outer container 2, it is preferable that an opening is formed in the annular rib 1C. Thereby, even if the space Sp is divided vertically, the upper and lower spaces Sp communicate with each other, so that the space Sp can be smoothly decompressed.

[0048] In the embodiment, the double container 100 provided with the packings 6A to 6C has been described as an example, but the present invention is not limited thereto. For example, if the adhesion between members can be ensured, the packings 6A to 6C may not be provided.

Explanation of Signs

[0049] 1: Inner container 1A: Inner container body 1A1: Barrel part 1A2: Bottom part 1B: Protrusion 1C: Annular rib 2: Outer container 2A: Outer container body 2A1: Barrel part 2A2: Bottom part 2A3: Opening 2B: Support part 2C: Engaging part 3: Middle lid 3A: Engaging lid part 3A1: Upper surface part 3A2: Cylindrical part 3A3: Engaging part 3B: Insertion cylindrical part 3B1: Upper cylindrical part 3B2: Engaging part 3B3: Lower cylindrical part 4: Outer lid 4A: Engaging part 5: Valve member 5A: Body 5A1: Suction hole 5A2: Arrangement surface part 5A3: Valve seat 51: First component 52: Second component 5B: Valve body 5B1: Engaging part 5C: Spring 6A: Packing 6B: Packing 6C: Packing 100: Double container Sp: Space

Claims

1. A double container comprising a resin inner container, a resin outer container, and an inner lid, wherein the inner container has an inner container body, the inner container body is disposed inside the outer container, and a space is formed between the outer surface of the inner container body and the inner surface of the outer container, the double container is configured to be able to additionally decompress the space, the inner container and the outer container are separate and separable, the inner container further has a protruding portion, the outer container is provided with a support portion, the protruding portion is formed so as to protrude outward in the radial direction of the inner container and is supported by the support portion via a packing, the inner lid has an engaging lid portion and an insertion cylinder portion, the engaging lid portion is placed on the upper parts of the outer container and the inner container and is configured to be engageable with the outer surface of the outer container, the insertion cylinder portion is inserted into the inner container when the outer surface of the outer container and the engaging lid portion are engaged, below the upper surface portion of the engaging lid portion, the protruding portion, the packing, and the support portion are arranged in this order, When the engaging portion of the inner lid is engaged with the engaging portion of the outer container, the upper surface portion presses the protruding portion and the packing against the support portion, whereby the packing is configured to deform so as to be crushed. A double container.

2. The double container according to claim 1, wherein when the packing is a first packing, the double container includes a second packing disposed between the upper surface portion and the protruding portion, When the engaging portion of the inner lid is engaged with the engaging portion of the outer container, the second packing is configured to deform so as to be crushed. A double container.

3. The double container according to claim 1 or claim 2, wherein the space is decompressed to a pressure lower than atmospheric pressure. A double container.

4. The double container according to any one of claims 1 to 3, wherein the inner container further has an annular rib, the annular rib is formed on the outer surface of the inner container body, and the upper space and the lower space of the space above the annular rib communicate with each other. A double container.

5. The double container according to any one of claims 1 to 4, wherein it further includes a valve member, the valve member is provided on the outer container and can additionally decompress the space by opening and closing. A double container.

6. A method of using the double container according to any one of claims 1 to 5, wherein A method comprising an exhaust step of exhausting air in the space using a suction pump. **Claim 7**: A method of using the double container according to claim 6, comprising an assembly step of forming the space by assembling the inner container and the outer container after separating the inner container and the outer container, wherein the exhaust step is performed after the assembly step.

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