JP2019119516A - Double container - Google Patents

Abstract

To provide a double container in which a thickness in the vicinity of a flange does not become thick and there is no intrusion of a beverage from a joint.SOLUTION: The double container consists of an outer container 1 and an inner container 2. The inner container 2 is inserted into the outer container 1 to form an adiabatic space 3. The double container includes a fitting structure 30 and an engagement structure 40. The fitting structure 30 is formed by fitting an inner container fitting portion (e.g., a wall surface formed by a taper 34) to an outer container fitting portion (e.g., an opening formed by a protrusion 32). The engagement structure 40 is formed by engaging a lower surface side of a flange portion 23 of the inner container with an upper surface side of a flange portion 13 of the outer container. Along with the fitting function of the fitting structure 30, the flange 23 functions as a leaf spring in the engagement structure 40.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a double container comprising an outer container and an inner container, in which a heat insulation space is formed.

  Containers may contain hot and cold beverages.

  Preferably, the hot beverage is maintained at a high temperature. Cold beverages are preferably maintained at low temperatures. Also, when holding a container with a hot beverage, it may be hot and uncomfortable. Also, when holding a container with a cold beverage, it may be cold and uncomfortable.

  From the viewpoint of heat retention of contents and suppression of heat transfer to the handle, a double container in which an adiabatic space is formed is used.

  A double container in which an inner container made of resin is stacked on an outer container made of resin is general (for example, Patent Document 1).

Patent No. 4612313

  When stacking the inner container on the outer container, a joint structure is important so that the inner container does not shake in the outer container. Patent Document 1 discloses an example in which a flange having a semicircular cross section of the inner container is fitted to a flange having a curled cross section of the outer container and an example in which the flange of the inner container is hooked on the upper end of the upper body of the outer container. It is done.

  In both examples, the flange of the inner container is configured to be outside and cover the junction so that there is no ingress of beverage from the junction.

  As a result, the thickness near the flange of the double container becomes thick. There is a restriction on the design of the container (in other words, the appearance looks dull), and the touch of the lips when drinking the beverage is bad, and it may be difficult to drink.

  An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a double container in which the thickness of the vicinity of the flange does not become thick and there is no intrusion of the beverage from the joint.

  To achieve the above object, the double container of the present invention comprises an outer container and an inner container inserted into the outer container. An adiabatic space is formed between the outer container and the inner container. A fitting structure for fitting an inner container fitting portion provided on the barrel of the inner container to an outer container fitting portion provided on the barrel of the outer container, and the contents on the upper surface side of the flange portion of the outer container And an engagement structure for engaging the lower surface side of the flange portion of the vessel.

  In the above invention, preferably, in the fitting structure, the outer container fitting portion is formed to push down the inner container fitting portion, and in the engagement structure, the inner container flange portion presses the outer container flange portion. It is formed to be.

  The engagement structure functions in conjunction with the fitting structure. When the inner container flange portion presses the outer container flange portion, the inner container flange portion and the outer container flange portion are integrated. As a result, the thickness near the flange of the double container does not become thick. Moreover, there is no penetration | invasion of a drink from between an inner container flange part and an outer container flange part.

  In the above invention, preferably, in the engagement structure, the inner container flange portion is formed to be inclined such that the outer edge is lower than the inner edge as compared with the outer container flange portion.

  Thus, a minute space is formed between the inner container flange portion and the outer container flange portion, and the inner container flange portion is deformed to function as a plate spring. As a result, the inner container flange portion presses the outer container flange portion.

  In the above invention, preferably, in the fitting structure, the outer container fitting portion has a taper expanding in diameter from the top to the bottom, and the inner container fitting portion tapers in diameter from the top to the bottom The taper of the outer container fitting portion is formed to be inclined as compared with the taper of the inner container fitting portion.

  Thereby, the outer container fitting portion pushes down the inner container fitting portion.

  In the above invention, preferably, the fitting structure is formed intermittently in the circumferential direction.

  This facilitates manufacture.

  In the above invention, preferably, the width of the flange portion of the outer container is formed wider than the width of the flange portion of the inner container, and a sealing projection is formed on the upper surface of the flange portion of the outer container.

  Thereby, the contents in the inner container can be sealed by sealing the outer container.

  In the above invention, preferably, a sealing projection is formed on the upper surface of the flange portion of the inner container.

  Thereby, the contents in the inner container can be sealed. Thereafter, the inner container is inserted into the outer container to form a double container.

  The present invention for achieving the above object is a method of packaging contents in the above dual container. The contents are filled in the inner container, the sealing lid is welded to the sealing projection, the contents in the inner container are heat-sterilized, and the inner container and the outer container are stacked to form a double container.

  Thus, heat sterilization can be performed, and the integrity and design of the dual container can be maintained.

  The present invention to achieve the above object is a method of joining double containers. The double container is composed of an outer container and an inner container inserted into the outer container, forming a heat insulating space, and the outer container fitting portion provided on the trunk of the outer container forms a trunk of the inner container. And an engaging structure in which the lower surface side of the flange portion of the inner container is engaged with the upper surface side of the flange portion of the outer container. In the fitting structure, the outer container fitting portion pushes down the inner container fitting portion. In the engagement structure, the inner container is eliminated so as to eliminate a minute space formed between the lower surface of the inner container flange portion and the upper surface of the outer container flange portion in conjunction with the push-down operation of the fitting structure. The flange deforms, and the inner container flange portion presses the outer container flange portion.

  According to the double container of the present invention, the thickness near the flange does not become thick. As a result, there is no restriction on the design of the container (in other words, the stylish appearance can be maintained), and the lip feels good when drinking a beverage, making it easy to drink.

  Also, according to the double container of the present invention, there is no intrusion of the beverage from the joint.

Schematic configuration (embodiment) Schematic perspective view (embodiment) Operation explanatory drawing (embodiment) Fitting structure modification Fitting structure modification Fitting structure modification Engagement structure modification Engagement structure modification Outer container seal structure Inner container seal structure Content packaging operation explanatory drawing Before translucent container fitting Translucent container after fitting

~ Basic configuration ~
An embodiment according to the present invention will be described based on FIGS. FIG. 1 is a cross-sectional view. FIG. 2 is a perspective view. FIG. 3 is a diagram for explaining the operation, but the components of the main part are numbered.

  The outer container 1 includes a bottom 11, a body 12, and a flange 13. The inner container 2 includes a bottom 21, a body 22, and a flange 23.

  The body portions 12 and 22 are formed in a substantially inverted truncated cone shape as a schematic shape. That is, the diameter is reduced from the flanges 13 and 23 toward the bottoms 11 and 21.

  The flanges 13 and 23 protrude from the top of the body 12 and 22 in the substantially horizontal direction on the outer periphery.

  The inner container 2 is inserted into the outer container 1, and an adiabatic space 3 is formed between the outer container 1 and the inner container 2.

~ Characteristic configuration ~
FIG. 3 is a view for explaining the operation while showing each configuration of the main part.

  The dual container comprises a mating structure 30 and an engagement structure 40. Along with the fitting function of the fitting structure 30, the engagement structure 40 functions.

  Hereinafter, detailed configurations and operations of the lower fitting structure 30 and the upper fitting structure 40 will be described.

  The fitting structure 30 will be described. The fitting structure 30 is an inner container fitting portion (provided on the inner container trunk portion 22) in an outer container fitting portion (specifically, an opening formed by a protrusion 32 described later) provided on the outer container trunk portion 12 Specifically, it is formed by fitting a wall surface formed by a taper 34 described later. In the present embodiment, the upper fitting structure will be described as an example.

  In the upper part of the outer container body 12, a taper 31 is provided in the opposite direction to the taper of the body 12 so as to expand in diameter from the top to the bottom. The upper end of the taper 31 is continuous with the inner edge of the flange portion 13 and forms a projection 32 projecting to the inside of the container. The lower end of the taper 31 is continuous with the body of the body and forms a projection 33 projecting to the outside of the container.

  At the upper portion of the inner container body 22, a taper 34 is provided in the opposite direction to the taper of the body 22 so as to expand in diameter from the top to the bottom. The upper end of the taper 34 is continuous with the inner edge of the flange portion 23, and forms a projection 35 projecting to the inside of the container. The lower end of the taper 34 is continuous with the barrel body and forms a projection 36 projecting to the outside of the container.

  The outer container taper 31 is formed to be inclined relative to the inner container taper 34.

  The distance (R1) from the central axis of the outer container 1 to the projection 32 (taper upper end) is shorter than the distance (R2) from the central axis of the inner container 2 to the projection 36 (taper lower end).

  The distance (R1) from the central axis of the outer container 1 to the projection 32 is approximately the same as or slightly longer than the distance (R3) from the central axis of the inner container 2 to the projection 35 (the tapered upper end).

  Therefore, when the inner container 2 is inserted into the outer container 1, the projection 36 of the inner container 2 abuts against the projection 32 of the outer container 1 and the insertion is inhibited, but when pushed harder, the projection 32 follows the taper 34 It moves and is locked in the middle of the taper 34 and in the vicinity of the tapered upper end 35.

  At this time, a sufficient space is formed between the projection 33 of the outer container and the projection 36 of the inner container. The protrusions 33 and the protrusions 36 do not interfere with each other.

  The fitting structure 30 functions by fitting a cylinder (wall surface) formed by the taper 34 of the inner container 2 into the opening formed by the projection 32 of the outer container 1.

  In the mating structure 30, the projection 32 attempts to push the taper 34 horizontally. As a result, the inner container 2 is pushed down with respect to the outer container 1.

  The engagement structure 40 will be described. The engagement structure 40 is formed by engaging the lower surface side of the flange portion 23 of the inner container with the upper surface side of the flange portion 13 of the outer container.

  In the engagement structure 40, the inner container flange portion 23 is formed so as to be inclined such that the outer edge is lower than the inner edge in comparison with the outer container flange portion 13. In other words, the angle α between the line formed in the radial direction on the upper surface of the outer container flange portion 13 and the vertical downward line is the angle between the line formed in the radial direction on the lower surface of the inner container flange portion 23 and the vertical downward line It becomes larger than β (see FIG. 7).

  In the example of FIG. 3, while the center line of the outer container flange portion 13 is substantially horizontal, the center line of the inner container flange portion 23 is inclined downward from the inner edge to the outer edge (right to left in the figure). . As a result, the outer edge 41 of the inner container flange portion 23 contacts the corresponding position 42 on the upper surface of the outer container flange portion 13, and a minute space 43 is formed between the lower surface of the inner container flange portion 23 and the upper surface of the outer container flange portion 13. It is formed.

~ Interlocking ~
The interlocking between the fitting structure 30 and the engaging structure 40 will be described. FIG. 3 is an operation explanatory diagram.

  In the mating structure 30, the projection 32 attempts to push the taper 34 horizontally. As a result, the inner container 2 is pushed down with respect to the outer container 1 (described above).

  Naturally, the entire outer container 2 is pushed down, so that the flange outer edge 41 of the inner container 2 is also pushed down. As a result, the inner container flange outer edge 41 presses the outer container flange upper surface equivalent position 42.

  On the other hand, the displacement of the inner container flange portion outer edge end 41 is restrained to the position 42 corresponding to the upper surface of the outer container flange portion. As a result, the inner container flange portion 23 can be deformed in the minute space 43, and the lower surface of the inner container flange portion 23 approaches to be in contact with the upper surface of the outer container flange portion 13.

  That is, in the engagement structure 40, the inner container flange portion 23 functions as a leaf spring. By the leaf spring function, the inner container flange outer edge 41 further presses the outer container flange upper surface equivalent position 42.

~effect~
As described above, the engagement structure 40 functions in conjunction with the fitting structure 30. As a result, the following effects are achieved.

   By the joining by the fitting structure 30 and the joining by the engagement structure 40, the outer container 1 and the inner container 2 are reliably joined while forming the heat insulating space 3.

  In the engagement structure 40, the inner container flange outer edge 41 presses the outer container flange upper surface equivalent position 42. As a result, there is no gap between the outer container flange portion 13 and the inner container flange portion 23, and even if the flange 23 of the inner container 2 overhangs outside to cover the junction, there is no intrusion of the beverage from the junction.

  In the engagement structure 40, the inner container flange portion 23 closely contacts and is integrated with the upper surface of the outer container flange portion 13. As a result, the vicinity of the flange does not become thick. As a result, there are no restrictions on the design of the container, and the lip feels good when drinking a beverage, making it easy to drink.

  By the way, when the heat insulation effect is not required, each of the outer container 1 and the inner container 2 can be used as its own container. In particular, the design of the outer container 1 is considered, and the design can be maintained.

~ Modification Example of presence / absence of intermittence of fitting structure ~
In the above embodiment, the outer container trunk 12 is provided with a taper 31, a projection 32 and a projection 33. The inner container body 22 is provided with a taper 34, a projection 35 and a projection 36. The fitting structure 30 is formed by fitting a taper 34 to the projection 32 (see FIG. 3).

  The fitting structure 30 may be continuously formed in the circumferential direction, or may be intermittently formed in the circumferential direction.

  FIG. 4 is an example in which the fitting structure 30 is intermittently formed in the circumferential direction. The AA cross section and the BB cross section shown in FIG. 4 correspond to the AA cut line and the BB cut line shown in FIG. 2, respectively. The AA cross section and the BB cross section are repeatedly formed in the circumferential direction.

  In the AA cross section, the taper 31 is inclined as compared to the taper 34, and the projection 32 abuts on the taper 34 to form the fitting structure 30. As a result, the projections 33 project to the outside of the container, whereas the projections 32 project significantly to the inside of the container (see FIG. 3).

  In the BB cross section, the taper 31 and the taper 34 have substantially the same slope (the taper 34 is slightly inclined), the protrusion 32 is separated from the taper 34, and the fitting structure 30 is not formed. Also, the protrusions 32 do not significantly protrude inside the container.

  On the other hand, the taper 34, the projection 35 and the projection 36 of the inner container are the same between the cross section AA and the cross section BB.

  By the way, in the case where the protrusions 32 projecting remarkably to the inside of the container are continuously formed in the circumferential direction (all AA cross section), the protrusions 32 become an obstacle at the time of forming the outer container, and it may be difficult to remove from the mold. .

  By forming the projections 32 projecting remarkably to the inside of the container intermittently in the circumferential direction, the projections 32 are less likely to become an obstacle at the time of molding the outer container, and it becomes easy to remove from the mold.

~ Modification Example Mating structure ~
In the said embodiment, although the fitting structure 30 is formed in the outer container trunk | drum 12 upper part and the inner container trunk | drum 22 upper part, it is not limited to this. FIG. 5 shows a modification of the position of the fitting structure 30. As shown in FIG.

  The outer container body 12 is formed with a taper 31 in the opposite direction to the outer container body 12, the inner container body 22 is formed with a taper 34 in the opposite direction to the inner and outer container body 22, and the taper 31 is tapered It is inclined compared to 34 (numbering is common to Figure 3).

  5 (A) and 5 (B) are diagrams showing a middle part fitting structure. A fitting structure 30 is formed in the middle of the trunks 12 and 22. In FIG. 5A, the projection 33 protrudes to the outside of the container to form a taper 31. In FIG. 5 (B), the projection 32 protrudes to the inside of the container to form a taper 31.

  FIG. 5C is a view showing the lower fitting structure. The fitting structure 30 is formed in the lower part (position near the bottoms 11 and 21) of the trunks 12 and 22.

  In the above embodiment and the modification according to FIG. 5, the outer container body 12 is formed with the taper 31, the inner container body 22 is formed with the taper 34, and the fitting structure 30 is formed. It is not limited. FIG. 6 is a modification of the fitting structure 30 in which the tapers 31 and 34 are not formed.

  The outer container body 12 is formed with a hemispherical projection 37 intermittently projecting inward in the circumferential direction and the inner container body 22 is formed with a semicircular projection 38 continuous in the circumferential direction and projecting outward from the container ing.

  The semicircular projection 38 is moved past the hemispherical projection 37 and locked, whereby the fitting structure 30 functions.

  In any of the modifications, the inner container 2 is pushed down with respect to the outer container 1 by the fitting structure 30, and the engagement structure 40 functions in conjunction with this.

~ Modification Example Engaging structure ~
FIG. 7 shows a modification of the engagement structure 40. As shown in FIG.

  FIG. 7A is a modification of the pressing position. In the above embodiment, the inner container flange outer edge 41 presses the outer container flange upper surface equivalent position 42. That is, the pressing position is an arbitrary position on the upper surface of the outer container flange portion 13.

  The inner container flange portion outer edge end 41 may be at the same position as the outer container flange portion outer edge end 44 as in the modification according to FIG. 7A.

  In the above embodiment and the modification according to FIG. 7A, the upper surface of the outer container flange portion 13 is substantially horizontal, while the lower surface of the inner container flange portion 23 is inclined so as to be lowered from the inner edge to the outer edge But it is not limited to this. FIG. 7B and FIG. 7C show a modification of the flange inclination.

  In FIG. 7B, the upper surface of the outer container flange portion 13 is inclined so as to rise from the inner edge toward the outer edge, whereas the lower surface of the inner container flange portion 23 is substantially horizontal.

  In FIG. 7C, the upper surface of the outer container flange portion 13 is inclined downward from the inner edge to the outer edge, and the upper surface of the inner container flange portion 23 is inclined downward from the inner edge to the outer edge.

  In any of the modifications, as in the above embodiment, the angle α between the line formed in the radial direction on the upper surface of the outer container flange portion 13 and the vertical downward line is formed in the radial direction on the lower surface of the inner container flange portion 23 Is formed to be larger than an angle .beta. Between the vertical line and the vertical line. As a result, in the engagement structure 40, a minute space 43 is formed, and the inner container flange portion 23 functions as a leaf spring.

  FIG. 8 shows a modification of the outer container flange portion 13.

  In FIG. 8A, the outer edge of the outer container flange portion 13 is raised one step, and the upper surface of the outer container flange portion 13 and the upper surface of the inner container flange portion 23 are flush with each other at the corresponding portion.

  In FIG. 8B, the outer container flange portion 13 is provided with a substantially semicircular protrusion 14, the end surface of the inner container flange portion 23 opposes the side surface of the protrusion 14, and the upper surface of the protrusion 14 and the upper surface of the inner container flange portion 23 It becomes the same plane.

  In FIG. 8C, the outer container flange portion 13 is provided with a substantially trapezoidal protrusion 14, the end surface of the inner container flange portion 23 opposes the side surface of the protrusion 14, and the upper surface of the protrusion 14 and the upper surface of the inner container flange portion 23 are identical. It becomes a plane.

  In the modification according to FIG. 8, the end face of the inner container flange portion 23 is not exposed, and the feeling of the lip when drinking a drink is further improved.

~ Modification Seal structure ~
The above embodiment may further include a seal structure 50.

  FIG. 9 is a structural view and an operation explanatory view in the case of sealing the outer container 1.

  The width of the outer container flange portion 13 is formed wider than the width of the inner container flange portion 23. A sealing projection 15 is formed on the upper surface of the outer container flange portion 13. The upper surface of the sealing projection 15 is slightly higher than the upper surface of the inner container flange portion 23.

  The seal lid 5 is welded to the upper surface of the sealing projection 15. In the above embodiment, the outer container 1 and the inner container 2 are securely joined by the fitting structure 30 and the engagement structure 40, and by sealing the outer container 1, the contents in the inner container 2 can be sealed. .

    FIG. 10 is a block diagram and an operation explanatory view in the case of sealing the inner container 2.

  A sealing protrusion 25 is formed on the upper surface of the inner container flange portion 23.

  The seal lid 5 is welded to the upper surface of the sealing projection 25. Thereby, the contents in the inner container 2 can be sealed. In the above embodiment, the outer container 1 and the inner container 2 are reliably joined and integrated by the fitting structure 30 and the engagement structure 40.

Content packaging method
FIG. 11 is an operation explanatory view according to the content packaging in the case of sealing the inner container 2. The inner container 2 shown in FIG. 10 is used.

  Prepare the inner container 2. The contents are filled in the inner container 2 (FIG. 11A). The contents are, for example, chopsticks.

  With the contents filled in the inner container 2, the seal lid 5 is welded to the upper surface of the sealing protrusion 25 (FIG. 11B). The contents in the inner container 2 are thereby sealed.

  With the contents sealed, the contents in the inner container 2 are heat-sterilized (FIG. 11C). Since the contents are in a sealed state, once heat sterilization is performed, there is no risk of propagation of bacteria.

  The outer container 1 is prepared (FIG. 11D). The inner container 2 and the outer container 1 are stacked and integrated to form a double container (FIG. 11E).

  By the way, when heat sterilization is carried out after forming the double container, the resin is thermally deformed. There is also a possibility of thermal expansion of the heat insulation space 3. As a result, the fitting structure 30 and the engagement structure 40 may not function, and the integration of the outer container 1 and the inner container 2 may be impaired.

  Even if the integrity can be maintained, the influence of thermal deformation also affects the outer container 1 and the design of the outer container 1 is lost.

  On the other hand, as in the above operation, if only the inner container 2 is heated, and then the inner container 2 and the outer container 1 are stacked, the inner container 2 is sealed in a state where the contents are filled, The vessel 2 exhibits rigidity, and the influence of thermal deformation on the inner vessel 2 is limited.

  The outer container 1 is not thermally deformed, the fitting structure 30 and the engagement structure 40 function, and the outer container 1 and the inner container 2 are surely integrated.

  Even if the influence of thermal deformation on the inner container 2 slightly appears, the outer container 1 is not thermally deformed, and the design of the outer container 1 may not be impaired.

  Thus, according to the content packaging method, the integrity and design of the double container can be maintained.

~ Remarks ~
In the double container in the prior art, the flange of the inner container is outside so as to cover the joint so that the beverage does not enter from the joint.

  Therefore, there was no idea of making the flange 23 of the inner container 2 function as a leaf spring.

  The inventor of the present application has conceived that the flange 23 functions as a plate spring in the engagement structure 40 by interlocking with the fitting structure 30. Through the above thinking process, the present invention is completed.

  Therefore, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the above technical idea.

  ~ Other ~

  Although the material etc. of the outer container 1 and the inner container 2 are not particularly limited, for example, transparent or translucent resin may be used.

  FIG. 12 shows the double container before fitting, and FIG. 13 shows the double container after fitting.

  For example, the logo or character design of a beverage provider may be attached to the inner container 2. By making the outer container 1 visible, it is possible to produce an appearance different from that in the case where a logo or the like is attached to the outer container 1. For example, it looks different depending on the amount of light. This improves the designability.

  Further, by attaching a logo or the like to the inner container 2, there is no risk of the logo being peeled off due to friction or the like. This can maintain the design.

DESCRIPTION OF SYMBOLS 1 outer container 2 inner container 3 heat insulation space 5 seal lid 11 outer container bottom 12 outer container body 13 outer container flange 14 protrusion 15 seal projection 21 inner container bottom 22 inner container body 23 inner container flange 25 seal protrusion Reference Signs List 30 fitting structure 31 taper 32 protrusion 33 protrusion 34 taper 35 protrusion 36 protrusion 37 hemispherical protrusion 38 semicircular protrusion 40 engagement structure 41 inner container flange outer edge 42 outer container flange upper surface equivalent position 43 minute space 44 outer container flange Outer edge 50 seal structure

Claims (9)

A double container comprising an outer container and an inner container inserted into the outer container, wherein an insulating space is formed,
A fitting structure in which an inner container fitting portion provided in the barrel of the inner container is fitted to an outer container fitting portion provided in the barrel of the outer container;
An engagement structure for engaging the lower surface side of the flange portion of the inner container with the upper surface side of the flange portion of the outer container;
The double container characterized by having. In the fitting structure, the outer container fitting portion is formed to push down the inner container fitting portion,
The double container according to claim 1, wherein in the engagement structure, the inner container flange portion is formed to press the outer container flange portion. In the engagement structure,
The angle α between the line formed in the radial direction on the upper surface of the outer container flange portion and the vertical downward line is
From the angle β between the line formed in the radial direction on the lower surface of the inner container flange portion and the vertical downward line,
The double container according to claim 1 or 2, which is formed to be large. In the fitting structure, the outer container fitting portion has a taper expanding in diameter from the top to the bottom, and the inner container fitting portion has a taper expanding in diameter from the top to the lower,
The double container according to any one of claims 1 to 3, wherein the taper of the outer container fitting portion is formed to be inclined as compared with the taper of the inner container fitting portion. The double container according to claim 4, wherein the fitting structure is intermittently formed in the circumferential direction. The width of the flange portion of the outer container is formed wider than the width of the flange portion of the inner container,
The protrusion for sealing is formed in the upper surface of the flange part of the said outer container. The double container in any one of the Claims 1-5 characterized by the above-mentioned. The protrusion for sealing is formed in the upper surface of the flange part of the said inner container. The double container in any one of the Claims 1-5 characterized by the above-mentioned. Filling the contents into the inner container according to claim 7;
Welding a sealing lid to the sealing projection;
Heat sterilization of the contents in the inner container,
A method of packaging contents, comprising stacking the inner container and the outer container to form a double container. An outer container and an inner container inserted into the outer container to form an adiabatic space;
A fitting structure in which an inner container fitting portion provided in the barrel of the inner container is fitted to an outer container fitting portion provided in the barrel of the outer container;
An engagement structure for engaging the lower surface side of the flange portion of the inner container with the upper surface side of the flange portion of the outer container;
A method of joining double containers comprising
In the fitting structure, the outer container fitting portion pushes down the inner container fitting portion;
In the engagement structure, the inner container is eliminated so as to eliminate a minute space formed between the lower surface of the inner container flange portion and the upper surface of the outer container flange portion in conjunction with the push-down operation of the fitting structure. The flange is deformed, and the inner container flange portion presses the outer container flange portion.