WO2010146878A1

WO2010146878A1 - Double-layered container

Info

Publication number: WO2010146878A1
Application number: PCT/JP2010/004097
Authority: WO
Inventors: 松村泰治; 池田久太郎; 南真樹
Original assignee: 日清食品ホールディングス株式会社
Priority date: 2009-06-19
Filing date: 2010-06-18
Publication date: 2010-12-23
Also published as: JPWO2010146878A1

Abstract

Provided is a double-layered container which includes: an outer container made of paper which includes a tapered side wall part having an upper region and a lower region positioned below the upper region; an inner container made of synthetic resin which is disposed inside the outer container and has an upper side wall part that is in contact with the upper region, and a lower side wall part that is positioned below the upper side wall part and has an upper end part, central part, and lower end part; and an air layer which has a first layer thickness between the upper end part and the lower region, a second layer thickness greater than the first layer thickness and lying between the central part and the lower region, and a third layer thickness smaller than the second layer thickness and lying between the lower end part and the lower region.

Description

Double container

The present invention relates to a double container comprising an outer container made of paper and an inner container made of synthetic resin.
This application claims priority based on Japanese Patent Application No. 2009-146857 filed on Jun. 19, 2009, the contents of which are incorporated herein by reference.

Conventionally, various double containers in which a paper outer container and a synthetic resin inner container are combined have been developed. In particular, a certain degree of rigidity is required for a container such as an instant cup noodle in which instant food is stored in a container and distributed in the market with the food stored in the container. In addition, as a method of using such a container, for example, a method of cooking food by supplying hot water to a container in which food is stored, or a microwave oven is used in a state where the food is stored in the container. And how to cook food. Thus, after cooking the food accommodated in the container using hot water or a microwave oven, the eater eats the food in the container by holding the container by hand. Therefore, in order to enable the eater to hold the container by hand, in the container constituted by the outer container and the inner container, for example, a gap is formed between the outer container and the inner container. In addition, high thermal insulation is required.
As such a double container, for example, techniques such as Japanese Utility Model Laid-Open No. 57-183269 (Patent Document 1) or Japanese Patent Application Laid-Open No. 2007-290760 (Patent Document 2) are disclosed.

On the other hand, in recent years, from the viewpoint of effective utilization of resources and separation of garbage of consumers, a double container for food that is not disposable (Patent Document 3) has been demanded, and paper or synthetic resin used for disposable containers has been required. There is a need for an environment-friendly (small environmental load) container with reduced use of raw materials. Containers that reduce the amount of raw material used can realize weight reduction, which has the advantage of reducing transportation costs and the like.
Further, from the viewpoint of sorting wastes by consumers, there is also a need for a container that can easily separate paper and plastic after a eater eats instant food.

However, the conventional containers including Patent Document 1 and Patent Document 2 described above have sufficient rigidity, have excellent heat insulating properties due to the gap formed between the inner container and the outer container, and are made of paper. The outer container and the inner container made of synthetic resin can be easily separated, and the amount of paper or synthetic resin used is small, and an environmentally friendly double container has not been obtained.

Japanese Utility Model Publication No. 57-183269 JP 2007-290760 A JP 2008-239157 A

Therefore, the present inventors are a double container in which a paper outer container and a synthetic resin inner container are combined, and have sufficient rigidity, excellent heat insulation, and a paper outer container. And an inner container made of a synthetic resin can be easily separated, and furthermore, a container suitable for instant foods and the like with a small amount of paper or synthetic resin used has been studied. The present invention aims to provide such a double container.

In order to solve the above problems, the present invention employs the following means.
(1) The present invention is a double container, and is a paper outer container including an upper region and a lower region positioned below the upper region and including a tapered side wall portion; A synthetic resin disposed on the inner side of the outer container, having an upper side wall portion that contacts the upper region, and a lower side wall portion that is located below the upper side wall portion and has an upper end portion, a central portion, and a lower end portion. A first inner layer thickness between the upper end and the lower region, and a second layer larger than the first layer thickness between the central portion and the lower region. And an air layer having a layer thickness between the lower end portion and the lower region and having a third layer thickness smaller than the second layer thickness.
In the present invention, the “upper end” means a region above the lower side wall including the upper end of the lower side wall.
The “lower end” means a region below the lower side wall including the lower end of the lower side wall.
The “central portion” means a region located between the “upper end portion” and the “lower end portion” of the lower side wall portion, and includes a middle portion in the vertical direction of the lower side wall portion. .

(2) In the double container described in (1) above, the outer container and the inner container are formed as a rotating body having a common virtual axis, and the lower side wall portion is on the radially inner side of the inner container. You may employ | adopt the structure currently formed in the curved shape so that it may dent toward.

(3) In the double container described in (2) above, the upper side wall portion has a lower end edge, the lower side wall portion has an upper end edge, and the diameter of the upper side wall portion at the lower end edge is A configuration may be adopted in which the inner container has an upper step portion between the upper side wall portion and the lower side wall portion, which is larger than the diameter of the lower side wall portion at the upper end edge.

(4) In the double container described in (2) above, the inner container is provided between a bottom side wall located below the lower side wall, and between the lower side wall and the bottom side wall. You may employ | adopt the structure which has a lower level | step-difference part and the inner container lower part connected to the said bottom side wall part.

(5) In the double container described in (4) above, the thickness of the synthetic resin in the lower part of the inner container is greater than the thickness of the upper side wall, the lower side wall, and the bottom side wall. May be.

(6) In the double container according to the above (1) or (2), the outer container has an outer container bottom surface, and the inner container has an inner container lower surface in contact with the outer container bottom surface, The inner container is fixed to the outer container by adhering the lower surface of the inner container to the bottom surface of the outer container, and the outer container bottom surface has a strength capable of separating the bottom surface of the outer container from the lower surface of the inner container. You may employ | adopt the structure currently fixed to the said inner container lower surface.

(7) In the double container according to the above (1) or (2), the inner container is fixed to the outer container by bonding the upper side wall portion to the upper area, and the upper area is A configuration may be adopted in which the upper region is fixed to the upper side wall portion by a strength capable of separating the upper region from the upper side wall portion.

(8) In the double container described in (1) above, the outer container has an opening and a first flange provided on the periphery of the opening, and the inner container is the first container. You may employ | adopt the structure which has a 2nd flange part fitted to a flange part.

(9) In the double container according to (8), the outer container has a bottom surface of the outer container, and the inner container has a bottom surface of the inner container that does not contact the bottom surface of the outer container. Also good.

According to the double container of the present invention described in the above (1) and (2), even when a material having a small wall thickness and a reduced amount of paper or synthetic resin is used, it is suitable for the container. Stiffness can be obtained. Also, even when hot water is supplied into the inner container, or even when a double container is placed in a microwave oven to cook food, excellent heat insulation is obtained, and the contents in the double container are High ability to protect against impacts applied to double containers.
Specifically, in the double container of the present invention described in the above (1) and (2), the upper side of the inner container is located in the upper region located on the upper inner surface in the side wall of the tapered outer container made of paper. The upper side wall part located in is contact | abutted. This structure gives the double container strong rigidity, so that even if the thickness of each container is small, sufficient resistance to physical pressure applied from outside the upper part of the double container is provided. can get. In other words, by ensuring rigidity by this structure, it is possible to provide a double container in which the amount of raw materials used for the outer container and the inner container is reduced.
And in the double container of this invention as described in said (1), (2), since the air layer is formed between the lower side wall part of an inner container, and the side wall part (inner side surface) of an outer container, , Heat insulation can be obtained. In particular, when the double container of the present invention is applied to a cup container in which instant noodles are accommodated, such as a cup container to which hot water is supplied or a cup container disposed in a microwave oven, the side wall of the inner container is synthesized. When the resin is formed with a thin wall thickness, the inner container expands outward due to hot water in the container. However, in the double container of the present invention described in the above (1) and (2), an air layer is formed between the lower side wall part of the inner container and the side wall part (inner side surface) of the outer container. , Heat insulation can be maintained.
In this case, since an air layer is formed between the lower side wall portion of the inner container and the side wall portion of the outer container, a buffering action is generated by the air layer, and contents such as food contained in the inner container Is protected from the impact applied to the double container, and the contents can be prevented from being damaged.
In particular, in the configurations of (1) and (2) above, the thickness of the air layer between the outer container and the lower wall portion of the inner container is the central portion of the lower wall portion (the vertical direction of the double container). In the vicinity of the central region) (second layer thickness). For this reason, since the distance of a lower wall part and an outer container can fully be obtained, ensuring the capacity | capacitance of an inner container, the double container which has sufficient heat insulation is realizable. And even if hot water is supplied into the inner container made of synthetic resin and the inner container is thermally expanded, the layer thickness of the air layer is large in the vicinity of the central portion of the lower side wall part that is likely to expand, Even if the side wall of the vessel is thin, the thickness of the air layer (second layer thickness) can be easily secured and the heat insulation of the double container can be maintained.
Moreover, in the double container of this invention as described in said (1), (2), paper and plastic can be isolate | separated easily. In particular, as described in (2) above, if the lower wall portion is formed in a curved shape so as to be recessed toward the inner side in the radial direction of the inner container, the content can be obtained even when the thickness of the lower wall portion is smaller. Expansion of the vessel is suppressed and contact with the outer container can be prevented.

In the case of the above (3), the upper step portion formed between the upper wall portion and the lower wall portion can secure the rigidity of the inner container against the pressure applied in the radial direction to the upper wall portion. For this reason, the thickness of the material which comprises an inner container can be made small, and the usage-amount of the synthetic resin at the time of shape | molding an inner container can be reduced further.
Moreover, the thickness of the air layer in the lower side wall portion can be sufficiently secured, and the heat insulation can be secured. Furthermore, by partitioning the upper wall portion and the lower wall portion by the upper step portion, it is possible to suppress the amount of thermal expansion that causes the lower wall portion of the inner container to thermally expand due to the supply of hot water. Therefore, it is possible to easily provide an inner container that reliably prevents the outer container from coming into contact with the lower wall portion.

In the case of the above (4), the lower step portion formed between the lower side wall portion and the bottom side wall portion can secure the rigidity of the inner container against the pressure applied in the radial direction to the lower side wall portion. For this reason, the thickness of the material which comprises an inner container can be made small, and the usage-amount of the synthetic resin when shape | molding an inner container can be reduced.
Moreover, the amount of thermal expansion in which the lower wall portion of the inner container is thermally expanded by supplying hot water can be easily suppressed by partitioning the lower wall portion and the bottom wall portion by the lower step portion. Therefore, it is possible to easily provide an inner container that reliably prevents the lower wall portion from coming into contact with the outer container.
In particular, when the container content is a large hard lump such as instant noodle noodle lump, the thin inner wall of the container may be deformed and contact the outer container by the noodle lump being pushed in. Conceivable. However, by having the lower step portion, it is possible to prevent the noodle mass from being pushed in, and to prevent the deformation of the inner container and the contact of the inner container side wall with the outer container. Moreover, in the case of instant noodles, it is possible to have a suspended structure in which the noodle mass is caught by the lower step portion and does not contact the lower part (bottom) of the inner container. By having a suspended structure in the container, breakage of the noodle mass can be prevented.

In the case of (5) above, the rigidity of the inner container against the pressure applied in the radial direction to the bottom side wall portion can be secured. Moreover, since the inner container lower part and upper wall part which have high rigidity are located in the both sides of an inner container, the rigidity of an inner container can be improved synergistically by an inner container lower part and an upper wall part.

In the case of (6) above, the bottom surface of the outer container is fixed to the bottom surface of the inner container with a strength capable of separating the bottom surface of the outer container from the bottom surface of the inner container. In the case of (7) above, the upper region is fixed to the upper side wall portion with a strength capable of separating the upper region from the upper side wall portion. In this case, the inner container made of synthetic resin can be easily separated from the outer container made of paper, and the outer container and the inner container can be separated and discarded.

In the case of (8) above, the inner side surface of the outer container is in contact with the outer side surface (upper side wall part) of the inner container within a certain range, and the second flange part is fitted to the first flange part. According to this configuration, sufficient resistance to physical pressure applied from the outside in the vicinity of the first flange portion of the outer container can be obtained. Therefore, when the first flange portion is formed in the outer container, sufficient rigidity of the double container in the first flange portion and the upper side wall portion can be obtained, and the amount of raw materials used in the outer container and the inner container can be reduced. can do.

In the case of (9) above, the inner container is arranged inside the outer container so that the bottom surface of the outer container does not contact the lower surface of the inner container. According to this configuration, when hot water is supplied into the double container, or when the double container is placed in the microwave oven and cooking is performed, the bottom of the double container does not become hot. Further, according to this configuration, since the contents are suspended from the outer container, the ability to protect the contents from the impact applied to the double container is further enhanced.

It is a front view which shows the outer container in the 1st Embodiment of this invention. It is a front view which shows the inner container in the 1st Embodiment of this invention. It is a figure which shows the flange part (2nd flange part) of the inner container in the 1st Embodiment of this invention. It is a perspective view which shows typically the double container of the 1st Embodiment of this invention. It is a figure which shows the method of isolate | separating an inner container from an outer container. It is a figure which shows the method of integrating an outer container and an inner container by winding by heating a flange part. It is a perspective view which shows typically the double container by which the bottom part of the outer container is rounded. It is a perspective view which shows typically the double container in the 2nd Embodiment of this invention. It is a front view which shows the inner container in the 2nd Embodiment of this invention. It is a perspective view which shows typically the double container of the 3rd Embodiment of this invention, Comprising: It is a figure which shows the state by which the liquid was supplied in the inner container. It is a perspective view which shows typically the modification of the double container of the 1st Embodiment of this invention. It is a longitudinal cross-sectional view which shows the double container in the 4th Embodiment of this invention. It is a longitudinal cross-sectional view of the outer container in 4th Embodiment. It is a front view which shows the inner container in 4th Embodiment. It is a longitudinal cross-sectional view of the double container in the 5th Embodiment of this invention. It is a longitudinal cross-sectional view of the outer container in 5th Embodiment. It is a longitudinal cross-sectional view of the inner container in 5th Embodiment.

(First embodiment)
FIG. 1 is a front view showing an outer container 1 according to the first embodiment of the present invention.
The outer container 1 in the present embodiment has an opening 2 at the top, and a flange 3 (first flange) is formed around the opening 2. In FIG. 1, the flange portion 3 is formed in a curl shape, but the flange portion 3 has a flange portion 5 (second flange portion) of the inner container 4 to be described later and an upper portion (opening portion 2) of the outer container 1. Through the flange portion 3. The shape of the flange portion 3 is not limited to the curled shape, and may be another shape.

When the flange part 5 of the inner container 4 is fitted to the flange part 3 of the outer container 1, the rigidity of the outer container 1 and the inner container 4 increases with respect to the pressure applied from the outside of the flange part 5. The outer container 1 is made of paper, but has a higher strength than a normal paper container because a double container structure with the inner container 4 is used. Therefore, it is not necessary to use many paper materials in order to improve the strength, and the basis weight of the paper constituting the outer container 1 can be kept low.

FIG. 2 shows the structure of the inner container 4 constituting the double container in the first embodiment.
The inner container 4 in the present embodiment has an opening 6 at the top, and the flange 5 is formed around the opening 6. Further, in the flange portion 5, as shown in FIG. 3, the end surface located outside the flange portion 5 in the radial direction is curved so that its tangent line changes from the horizontal direction to the downward direction (curved end surface). ).
In the present embodiment, the flange portion 5 of the inner container 4 has a shape that is curved downward as described above. Moreover, the back side (back surface) of the curved end surface formed in the flange portion 5 is also curved, that is, has a curved surface. As will be described later, the curved surface is in contact with the flange portion 3 as shown in FIG. 4, whereby the flange portion 3 and the flange portion 5 are fitted. That is, the double container of the first embodiment has a flange structure in which the flange portion 3 and the flange portion 5 are integrated.
In such a structure, sufficient resistance to the pressure (arrow X1 in FIG. 3) applied in the substantially horizontal lateral direction of the flange portion 5 is obtained.

Specifically, when the flange portion 5 is provided with a structure having a curved end surface, that is, a structure in which the end surface is curved so that the tangent line at the end surface changes from the horizontal direction to the downward direction, the inner container is disposed in a substantially horizontal lateral direction. Even if pressure is applied from the outside (arrow X1), the flange portion 5 is not easily deformed. Furthermore, since the curved end surface is formed in the flange portion 5, the flange portion 3 of the outer container 1 described above can be reliably fitted to the flange portion 5. For this reason, the strength (flange rigidity) of the flange portion 3 can be ensured by the flange structure in which the flange portion 3 and the flange portion 5 are integrated.
Since the flange portion 3 and the flange portion 5 are integrated, the space formed by the combination of the outer container 1 and the inner container 4 is sealed by the flange portion 3 and the flange portion 5. That is, in the flange structure in which the flange portion 3 and the flange portion 5 are integrated, an air layer (described later) is sealed in the double container, thereby realizing a heat insulating structure by the air layer.

The inner container 4 has a tapered upper side wall portion 7 connected to the flange portion 5 so as to be continuous. The upper side wall portion 7 has a certain region (predetermined height) in the height direction. The upper side wall part 7 is formed in a tapered shape having the same angle as the taper angle of the side wall part of the outer container 1 so as to contact the inner side surface of the outer container 1 described above. Here, the taper angle means an angle between a vertical line extending in the vertical direction of the double container and a ridge line on the tapered surface.
Thus, the rigidity (upper contact rigidity) of the double container is improved by the contact between the inner side surface of the outer container 1 and the upper wall portion 7 of the inner container 4. Furthermore, in the double container of the first embodiment, such upper contact rigidity and the rigidity (flange rigidity) resulting from the flange structure including the

flange portions

3 and 5 described above are obtained synergistically. As a result, the rigidity against physical pressure applied from the outside of the double container is further improved.
The height of the upper side wall portion 7 of the inner container 4 that contacts the inner surface of the outer container 1 is less than half the height of the double container, preferably 1/3 to 1/12, particularly preferably 1 /. It is preferably about 4 to 1/8.

Furthermore, the inner container 4 has a lower side wall portion 9 connected so as to be continuous with the tapered upper side wall portion 7. The lower side wall portion 9 is connected to the upper side wall portion 7 on the radially inner side of the upper side wall portion 7, and as shown in FIG. 4, there is a gap (air layer) between the lower side wall portion 9 and the outer container 1. 8 is formed.
That is, in the case of the first embodiment, in the inner container 4, the lower wall part 9 connected to the lower end of the upper wall part 7 of the inner container 4 is bent inward in the radial direction of the inner container 4 from the lower end of the upper wall part 7. Has a structure. With this structure, a gap 8 is formed between the outer container 1 and the inner container 4.
The void 8 protects the contents such as food contained in the inner container 4 from the impact applied to the double container. That is, since air (air layer) exists outside the lower wall portion 9 of the inner container 4, the double container according to the first embodiment buffers an impact applied from the outside of the outer container 1. Have the ability.

Here, it is necessary to secure a predetermined gap as the size of the gap 8 between the outer container 1 and the inner container 4. That is, in the case of a double container that is used by supplying hot water or the like into the inner container 4, heat insulation is obtained by this gap, and the double container can be held by hand without transferring heat to the hand of the eater. . Therefore, it is necessary to sufficiently obtain the size of the gap from the viewpoint of ensuring heat insulation and protecting the hand of the eater.

As the material of the inner container 4, a synthetic resin material is used. Specific examples include polyethylene, polypropylene, and polystyrene, but the material of the inner container 4 is not limited to the above materials. As a method for forming the inner container 4, a molding method generally used using the above materials is used. Specifically, an injection molding method, a blow molding method, or a method of molding a thermoplastic synthetic resin sheet by vacuum molding, pressure molding, thermoforming, or the like is used. In particular, when a polypropylene sheet is used, a plug assist method which is one of vacuum forming methods is suitable.
In the double container of the first embodiment, the flange rigidity obtained by the flange structure including the

flange parts

3 and 5 is obtained by the contact between the inner side surface of the outer container 1 and the upper wall part 7 of the inner container 4. The upper abutment rigidity to act synergistically improves the container strength. For this reason, especially the thickness of the lower side wall part 9 which comprises some inner containers 4 may be very small, Therefore The usage-amount of a synthetic resin can be suppressed.

However, if the lower wall portion 9 is formed so as to reduce the thickness, the temperature of the inner container 4 is increased when the weight of the contents accommodated in the inner container 4 is increased, or by supplying hot water or heating with a microwave oven. When raised, the lower wall portion 9 of the inner container 4 expands radially outward. When the inner container 4 expands, the gap 8 between the lower side wall portion 9 of the inner container 4 and the inner side surface of the outer container 1 formed to obtain heat insulation becomes narrower. Further, when the inner container 4 comes into contact with the outer container 1, the heat insulating property is not maintained. Therefore, the thickness of the lower wall portion 9 made of synthetic resin, the inner side surface of the inner container 4 and the outer container so as not to contact the inner side surface of the outer container 1 even when the lower wall portion 9 of the inner container 4 expands. The container of the first embodiment is designed by adjusting the distance of the gap 8 between the first embodiment. Specifically, the lower wall portion 9 of the inner container 4 is set so that the layer thickness (distance between the inner container 4 and the outer container 1) of the central region of the gap 8 is larger than the upper and lower regions. Is formed.
When the inner container 4 is relatively rigid, a structure in which the inner container 4 is formed and the inner container 4 is fitted to the outer container 1 as shown in FIG. 4 may be used. However, when the inner container 4 is very easily deformed and the lower side wall portion 9 is formed in a bent shape, as shown in FIG. 11, the inner container 4 is formed so as to make the gap 8 as wide as possible. It is preferable to use a structure in which the inner container 4 is fitted to 1.

FIG. 4 shows a structure in which the inner container 4 is stacked on the outer container 1, but a method of integrating the outer container 1 and the inner container 4 is performed as follows, for example. That is, the inner container 4 is stacked on the outer container 1 so that the flange part 5 of the inner container 4 is fitted to the flange part 3 of the outer container 1. However, in general, both containers may be separated from each other only by overlapping the two containers. Therefore, a hot melt adhesive is attached to the inner surface side of the flange portion 5 of the inner container 4, or heat is applied through polyethylene or the like to partially bond the inner container 4 to the outer container 1. Is preferred. In addition, the position where hot melt or polyethylene or the like is bonded is arbitrarily selected, and is, for example, a portion where the inner container 4 contacts the outer container 1.

As a position (adhesion part) where hot melt or polyethylene is adhered, for example, the flange part 3 of the outer container 1 or the taber-shaped upper side wall part 7 of the inner container 4 can be mentioned. Further, by appropriately adjusting the size of the above-mentioned bonding portion, after the eater uses the double container, the outer container 1 and the inner container 4 can be easily separated as shown in FIG. Paper and synthetic resin (plastic) can be easily separated.
In addition, regarding the lower surface 10 (inner container lower surface) of the inner container 4 and the bottom 11 (outer container bottom surface) of the outer container 1, a structure in which both members do not contact and a structure in which both members contact each other are used. In the structure in which the lower surface 10 is in contact with the bottom portion 11, the bottom portion 11 and the lower surface 10 may be bonded. In addition, as a structure of the outer container 1, it can also be set as the structure which does not have the bottom part 11. FIG.

Further, as a method of integrating the outer container 1 and the inner container 4, as shown in FIG. 6, the inner container 4 is disposed in the outer container 1 so as to overlap the outer container 1, and the

flange portions

3 and 5 are brought into contact with each other. Then, the flange portion 5 of the inner container 4 may be heated to curl and wind the flange portion 5. Even in the structure obtained by this method, it is possible to prevent the inner container 4 from being separated from the outer container 1. In the present invention, a method for obtaining such a structure is also included in the term “fitting” in the present invention.

Further, the double container shown in FIG. 4 has a structure in which a base 11 a is formed on the periphery of the bottom 11 of the outer container 1. The base 11a is located at the lower end of the double container, and is a part that is placed on a table, for example, when the eater eats the contents stored in the inner container 4. The total weight of the weight of the double container including the inner container 4 and the outer container 1, the weight of the contents accommodated in the inner container 4, and the weight of hot water supplied to the inner container 4 is loaded on the base 11a. . When the contents stored in the inner container 4 are cooked using a microwave oven, a structure in which the bottom 11 of the outer container 1 is rounded in the vicinity of the grounding portion as shown in FIG. 7 may be used. In this structure, excessive heating at the base 11a of the outer container 1 can be prevented.

The above-described double container can be used in various ways, but as one method, it can be used as a container for instant food. That is, a container used for adding hot water to the inner container 4 containing instant food such as instant noodles, or for cooking the instant food by placing the inner container 4 containing the instant food in a microwave oven. As described above, the double container described above is particularly useful. By using this double container, the instant food can be restored in the double container, and the eater can easily eat the instant food.

(Second Embodiment)
Next, a second embodiment of the present invention will be described.
In the second embodiment, the same members as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified.
FIG. 8 is a perspective view schematically showing the double container of the second embodiment. The double container shown in FIG. 8 has a different structure from the double container shown in FIG. That is, in the inner container 4 shown in FIG. 4, the lower side wall portion 9 of the inner container 4 is formed in a bent shape that bends radially inward, but as shown in FIGS. The inner container 20 in the second embodiment has a lower side wall portion 21 that is curved radially inward.

The lower side wall portion 21 is a region located below the upper side wall portion 7, and is located below the upper end portion 21 a and the upper end portion 21 a that are regions above the lower side wall portion 21 including the upper end of the lower side wall portion 21. The center part 21b and the area | region located under the center part 21b, Comprising: It has the lower end part 21c which is an area | region below the lower side wall part 21 including the lower end of the lower side wall part 21. FIG. The central portion 21b is a region located between the upper end portion 21a and the lower end portion 21c, and indicates a region including an intermediate portion in the vertical direction of the lower side wall portion 21.
As shown in FIG. 8, in the structure in which the inner container 20 is fitted in the outer container 1, a gap 8 is formed between the lower wall portion 21 and the outer container 1, and the gap 8 is doubled by the

flange portions

3 and 5. Sealed in a container. The layer thickness of the void 8 changes in the direction from the upper end 21a to the lower end 21c. Specifically, the layer thickness (second layer thickness) of the gap 8 between the central portion 21 b and the outer container 1 is the layer thickness (first layer thickness) of the gap 8 between the upper end portion 21 a and the outer container 1. Bigger than). Further, the layer thickness (third layer thickness) of the gap 8 between the lower end portion 21c and the outer container 1 is smaller than the layer thickness (second layer thickness) of the gap 8 between the central portion 21b and the outer container 1. .
Since the lower wall portion 21 is formed in a curved shape so as to set the layer thickness of the gap 8 as described above, when the food in the inner container 20 is cooked by supplying liquid (hot water) to the inner container 20. Or, when the food in the inner container 20 is cooked using a microwave oven, even if the inner container 20 expands and deforms radially outward, the inner container 20 does not come into contact with the outer container 1 and doubles. The heat insulating property of the container can be maintained.

As shown in FIG. 8, in the double container of the second embodiment, there is a large gap between the inner bottom surface (outer container bottom surface) of the outer container 1 and the lower surface of the inner container 20 (lower surface of the inner container). Is formed. Thus, since the suspended structure in which the lower surface of the inner container 20 does not touch the inner bottom surface of the outer container 1 is used in the double container, cooking is performed when hot water is supplied to the inner container 20 or using a microwave oven. When this is done, the inner bottom surface of the outer container 1 does not become hot even if the contents become high temperature. That is, the contents can be cooked in the double container while maintaining high heat insulation. Further, since the inner container 20 is arranged in the double container by the suspended structure, a double container having a higher buffering capacity against the impact applied to the outer container 1 is realized, and the contents 20 are prevented from being damaged. can do. Specifically, an expansion amount by which the inner container 20 expands by heating with hot water or a microwave oven is taken into consideration, and the interval between the lower surface of the inner container 20 and the inner bottom surface of the outer container 1 is set appropriately. For example, this interval may be an interval of several mm or more.

(Third embodiment)
Next, a third embodiment of the present invention will be described.
In the third embodiment, the same members as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified.
FIG. 10 is a perspective view schematically showing the double container of the third embodiment, and shows a state where hot water is supplied into the inner container.
The double container of the third embodiment includes an inner container 30 that is very thin (small) (thickness between an inner surface and an outer surface). In the inner container 30, when a liquid such as hot water is supplied into the inner container 30, the lower wall portion 31 of the inner container 30 expands and the outer container 1 is contacted at the contact portion P below the lower wall portion 31. It is in contact with the inner surface. When the lower side wall portion 31 of the inner container 30 and the inner side surface of the outer container 1 come into contact, the heat energy in the inner container 30 is transmitted to the outer container 1 at the contact portion P. For this reason, in the contact part P, heat insulation is not acquired. For this reason, it becomes difficult for the eater to grasp a portion located outside the double container corresponding to the contact portion P. However, even if such a structure is used, the necessary heat insulation in the double container is ensured by limiting the location of the contact portion P and generating the contact portion P only in a part of the region. be able to. Specifically, by designing the inner container 30 so that the contact portion P is generated at the lower part of the side wall of the double container that is not gripped by the eater, the inner container 30 and the outer container 1 are located near the center of the side surface of the double container. The gap 8 formed therebetween is maintained. This makes it possible to obtain necessary heat insulating properties even when the eater grips the double container at the time of eating.

Thus, the contact area where the contact portion P is located is at least 1/2 or less, preferably 1/3 or less of the height from the bottom surface of the double container in the direction from the bottom surface of the double container toward the flange portion. It is preferable that the region is from the lower surface of the double container to ¼ or less of the height thereof. As a method for forming the inner container 30 having such a structure, a vacuum molding method for molding a synthetic resin sheet or a molding method by pressure molding or the like is used. According to this method, the inner container 30 can be formed so that the thickness of the side wall of the inner container 30 in the contact area is minimized, and the inner container 30 can be easily manufactured. Further, when the inner container 30 expands and comes into contact with the outer container 1 at the lower part of the double container in this way, the effect of increasing the rigidity of the entire double container is also obtained.

Also in the third embodiment, the lower wall portion 31 is curved radially inward as in the second embodiment. In this case as well, as in the second embodiment, the layer thickness of the gap 8 formed between the lower wall portion 31 and the outer container 1 changes. In short, the gap 8 near the center of the side wall is the largest. Thereby, in 3rd Embodiment, even if the inner container 30 expand | swells by supplying hot water, and the lower side wall part 31 of the inner container 30 contacts the side wall part (lower inner side surface) of the outer container 1, The area of the contact region can be reduced, and in other regions, the container can be made out of contact with the outer container 1.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIGS.

The double container 40 in the fourth embodiment has a paper outer container 41 and a synthetic resin inner container 42.
The outer container 41 has an outer container side wall portion 43 (side wall portion), an outer container opening portion 44 (opening portion), and an outer container bottom portion 45. The outer container side wall 43 is formed in a tapered shape so that its diameter gradually decreases at a constant rate in the direction from the outer container opening 44 toward the outer container bottom 45. The outer container opening 44 is open at the large diameter side end of the outer container side wall 43. The outer container bottom 45 closes the small diameter side end of the outer container side wall 43.

The inner container 42 has an inner container side wall 46, an inner container opening 47, and an inner container bottom 48 (lower inner container). The inner container side wall 46 is formed in a cylindrical shape, and has a circular cross section. An inner container opening 47 is formed at one end of the inner container side wall 46, and an inner container bottom 48 is formed at the other end. The inner container opening 47 opens the inner container side wall 46, and the inner container bottom 48 closes the inner container side wall 46.

The inner container 42 is inserted into the outer container 41 through the outer container opening 44 of the outer container 41 and is disposed inside the outer container 41. In the double container 40, the outer container 41 and the inner container 42 are formed as a rotating body having a common virtual axis L1.
Hereinafter, in the double container 40, the orientation of the container is expressed with the positions of the outer container opening 44 and the inner container opening 47 being above the container and the positions of the outer container bottom 45 and the inner container bottom 48 being below the container. .

The inner container side wall portion 46 includes an upper wall portion 49 that comes into contact with a predetermined region (upper region A1) set on the upper inner surface of the outer container side wall portion 43, a lower wall portion 50 that is positioned below the upper wall portion 49, And a bottom side wall 51 located below the lower side wall 50. The upper side wall portion 49 is formed in a tapered shape so that its diameter gradually decreases, has the same taper angle as the outer container side wall portion 43, and is in contact with the entire upper region A1 of the outer container side wall portion 43. . Thus, the rigidity with respect to the physical pressure applied from the outside of the double container 40 is ensured by contacting the upper wall part 49 and the outer container wall part 43 so as to overlap each other.

In the inner container side wall portion 46, the diameter of the lower end edge 49 A of the upper side wall portion 49 is larger than the diameter of the upper end edge 50 A of the lower side wall portion 50. An upper step portion 52 is formed between the upper wall portion 49 and the lower wall portion 50. Since the upper stepped portion 52 is formed, it is possible to ensure rigidity (rigidity for retaining the shape) against pressure applied in the radial direction to the upper side wall portion 49, and further, physical strength applied from the outside of the double container 40. It is possible to secure rigidity against a certain pressure or the like. In addition, since such rigidity is ensured, the thickness of the inner container 42 can be reduced, the amount of resin used when molding the inner container 42 can be reduced, and an environmentally friendly container can be provided. It becomes.

The diameter in the cross section of the lower side wall part 50 is smaller than the diameter of the outer peripheral surface of the outer container 41 in the range from the upper end edge 50A to the lower end edge 50B. Further, the lower end edge 50B of the lower wall portion 50 is close to the lower region A2 located below the upper region A1 of the outer container side wall portion 43. The lower side wall portion 50 is formed in a curved shape that is recessed toward the radially inner side of the inner container 42 in a longitudinal section including the virtual axis L1.

The lower wall portion 50 has an upper end portion 50C, a central portion 50D, and a lower end portion 50E. The upper end portion 50C is a region located below the upper side wall portion 49 and is an upper region of the lower side wall portion 50 including the upper end edge 50A. The lower end part 50E is an area located below the central part 50D, and is an area below the lower side wall part 50 including the lower end edge 50B. The central portion 50D is a region located between the upper end portion 50C and the lower end portion 50D, and includes a middle portion in the vertical direction of the lower side wall portion 50.

A first air layer 53 is formed between the lower side wall part 50 and the lower region A2 of the outer container side wall part 43. The first air layer 53 is a first layer thickness LT1 between the upper end portion 50C and the lower region A2, and a layer thickness between the central portion 50D and the lower region A2, which is larger than the first layer thickness LT1. It has a two-layer thickness LT2, and a third layer thickness LT3 that is between the lower end portion 50E and the lower region A2 and is smaller than the second layer thickness LT2.

The first air layer 53 prevents the impact applied to the outer container 41 in the double container 40 from being transmitted to the inner container 42. Further, the first air layer 53 ensures heat insulation between the outer container 41 and the inner container 42 when hot water or the like is supplied into the inner container 42. Here, in the inner container 42 of the double container 40, the lower wall portion 50 is formed in a curved shape that is recessed inward in the radial direction, and the first air layer 53 is between the lower wall portion 50 and the outer container 41. The second layer thickness LT2 having the largest thickness is provided. Thereby, the double container 40 ensures a sufficient distance between the lower wall portion 50 and the outer container 41 while ensuring the capacity of the inner container 42, and sufficiently secures the volume of the first air layer 53. Good thermal insulation is obtained.
And the thickness of the 1st air layer 53 is large in central part 50D vicinity of the lower side wall part 50 which is easy to expand | swell. For this reason, even when hot water is supplied to the inner container 42 made of synthetic resin and the inner container 42 is thermally expanded, an air layer can be secured between the outer container 41 and the inner container 42, Sex can be maintained. Moreover, since the volume of the 1st air layer 53 becomes large, heat insulation can be improved.
Furthermore, when the inner wall 42 is formed in a curved shape that is recessed toward the inner side in the radial direction, even when the thickness of the lower wall portion 50 is small, the lower wall portion 50 is less likely to thermally expand. There is also an effect. Here, the upper side wall portion 49 and the lower side wall portion 50 are partitioned by the upper step portion 52. In this case, the thermal expansion amount at which the lower side wall portion 50 is thermally expanded by supplying hot water can also be suppressed.

The height (width) of the upper side wall portion 49 in the inner container 42 is less than half the height of the double container 40, preferably 1/3 to 1/12. Further, from the viewpoint of securing the thickness of the first air layer 53 and securing the rigidity of the upper side wall portion 49, the height is particularly preferably ¼ to ６.
The height (width) of the lower wall portion 50 in the inner container 42 is preferably 1/2 or more with respect to the height of the double container 40 from the viewpoint of heat insulation.
The lower end edge 50B of the lower wall portion 50 may abut on the lower region A2 in the outer container side wall portion 43. In this case, the abutting portion is located at an intermediate position in the vertical direction of the outer container 41. Further, it is preferable to be located in a lower region, preferably up to ¼ or less of the height of the double container 40.

In the inner container 42, the diameter of the upper end edge 51 A of the bottom side wall part 51 located below the lower wall part 50 is smaller than the diameter of the lower end edge 50 B of the lower wall part 50. A lower stepped portion 54 is formed between the lower sidewall portion 50 and the bottom sidewall portion 51. Since the lower stepped portion 54 is formed, it is possible to ensure rigidity (rigidity for retaining the shape) against pressure applied from the radial direction around the lower end edge 50B that contacts the inner surface of the outer container 41. By ensuring rigidity in this way, the inner container 42 can be formed so as to reduce the thickness, the amount of synthetic resin used when the inner container 42 is molded can be reduced, and an environment-friendly container can be provided. Become.
In particular, when the container content is a large hard lump like instant noodle noodle lump, if the thickness of the lower side wall portion 50 of the inner container 42 is small, the noodle lump is pushed in and the inner container 42 It is conceivable that the lower wall portion 50 is deformed and comes into contact with the outer container 41. However, by having the lower step portion 54 in this way, the noodle mass is prevented from being pushed in, and the deformation of the inner container 42 and the contact of the lower wall portion 50 with the outer container 42 due to the deformation can be prevented. Further, in the case of instant noodles, the noodle mass can be hung on the lower step portion 54 so as not to come into contact with the inner container bottom 48, and the noodle mass can be prevented from being broken by forming a suspended structure in the container.
Moreover, since the lower side wall part 50 and the bottom side wall part are partitioned by the lower step part 54, it is possible to suppress the thermal expansion amount at which the lower side wall part 50 is thermally expanded by supplying hot water. Further, the formation of the lower stepped portion 54 prevents stacking when it is overlapped with the inner container 42 and facilitates removal.

The bottom side wall 51 extends substantially parallel to the virtual axis L1 of the inner container 42, and the lower edge 51B is close to the inner surface of the outer container 41. The bottom side wall 51 is connected integrally with the inner container bottom 48. The inner container lower surface 55 of the inner container bottom 48 is formed in a curved shape so as to protrude downward, and contacts the outer container bottom surface 56 of the outer container bottom 45. The thickness of the inner container bottom 48 is larger than the thickness of the upper side wall 49, the lower side wall 50, and the bottom side wall 51 in the inner container 42. As described above, when the thickness of the inner container bottom 48 is larger than the thickness of the upper side wall 49, the lower side wall 50 and the bottom side wall 51 in the inner container 42, the inner container 42 has a radial direction toward the bottom side wall 51. The rigidity with respect to the pressure applied to can be ensured. Further, since the inner container bottom 48 and the upper wall part 49 having high rigidity are located on both sides of the inner container 42, the inner container 42 can be synergistically improved in rigidity by the inner container bottom part 48 and the upper wall part 49. .

Further, as in the first embodiment, the inner container lower surface 55 is partially bonded to the outer container bottom surface 56 by using a hot melt adhesive or by applying heat through polyethylene or the like. . Further, by adjusting the size of the adhesion portion between the inner container lower surface 55 and the outer container bottom surface 56, the inner container 42 is easily separated from the outer container 41 after the eater uses the double container 40. be able to.

Further, in the double container 40, in addition to the first air layer 53, a second air layer 57 is formed between the lower step part 54, the bottom side wall part 51, and the outer container side wall part 43, and the inner container bottom part A third air layer 58 is formed between the outer container side wall part 43 and the outer container bottom part 45. The second air layer 57 communicates with the lower side of the first air layer 53, and the third air layer 58 communicates with the second air layer 58. These second air layer 57 and third air layer 58 also provide heat insulation to the double container 40. Here, in particular, in the double container 40, the position of the first air layer 53 corresponds to a position where the frequency of gripping by the eater is high on the side surface of the double container 40, in other words, It corresponds to a position where the frequency of contact with the side surface of the double container 40 is high. Since such an air layer is formed, it is possible to provide a good container that can be gripped by the eater and can be easily handled by the eater and that has high heat insulation.

Further, in this double container 40, the rigidity of the inner container 42 can be ensured by the upper side wall portion 49, the upper step portion 52 and the lower step portion 54, and the inner container 42 can be formed thin. When the container 40 is used as a cup container for storing instant noodles disposed in a microwave oven, the wall thickness of the lower side wall portion 50 in the inner container 42 can be changed to polypropylene while ensuring sufficient rigidity for normal use. In the case of the product, it was confirmed that it was molded very thinly to about 0.1 mm to 0.6 mm.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described with reference to FIGS.

The double container 60 in the fifth embodiment includes a paper outer container 61 and a synthetic resin inner container 62.
The outer container 61 has an outer container side wall part 63 (side wall part), an outer container opening part 64 (opening part), an outer container bottom part 65, and a flange part 66 (first flange part). The outer container side wall 63 is formed in a tapered shape so that its diameter gradually decreases at a constant rate in the direction from the outer container opening 64 toward the outer container bottom 65. The outer container opening 64 opens at the large-diameter end of the outer container side wall 63. The outer container bottom 65 closes the small-diameter end of the outer container side wall 63. The flange portion 66 projects radially outward from the outer peripheral edge of the outer container opening 64. The flange portion 66 is formed by rounding the upper edge of the outer container opening 64 so as to be disposed on the outside.

The inner container 62 includes an inner container side wall 67, an inner container opening 68, an inner container bottom 69 (lower inner container), and a flange 70 (second flange). The inner container side wall 67 is formed in a cylindrical shape, and has a circular cross section. An inner container opening 68 is formed at one end of the inner container side wall 67, and an inner container bottom 69 is formed at the other end. The inner container opening 68 opens the inner container side wall 67, and the inner container bottom 69 closes the inner container side wall 67. The flange portion 70 projects radially outward from the outer peripheral edge of the inner container opening 68.

The inner container 62 is inserted into the outer container 61 through the outer container opening 64 of the outer container 61 and is disposed inside the outer container 61. In the double container 60, the outer container 61 and the inner container 62 are formed as a rotating body having a common virtual axis L1.

The flange portion 70 of the inner container 62 has a base portion 71 and an arch portion 72 connected to the base portion 71. The base 71 extends radially outward from the outer peripheral edge of the inner container opening 68. The arch portion 72 is formed on the outer edge portion of the base portion 71, and has a bent end portion that extends downward from the outer end portion of the base portion 71, and a radially inner side of the inner container 62 while extending downward from the lower end portion of the bent end portion. And a curved portion that curves. The flange portion 70 is fitted to the flange portion 66 so that the flange portion 66 of the outer container 61 is accommodated in a space surrounded by the base portion 71 and the arch portion 72.
Hereinafter, in the double container 60, the direction of the container is expressed with the positions of the outer container opening 64 and the inner container opening 68 above the container and the positions of the outer container bottom 65 and the inner container bottom 69 below the container. .

The inner container side wall 67 includes an upper side wall 73 that contacts a predetermined region (upper region A1) set on the upper inner surface of the outer container side wall 63, a lower side wall 74 located below the upper side wall 73, And a bottom side wall portion 75 located below the lower side wall portion 74. The upper side wall 73 is tapered so that its diameter gradually decreases at a constant rate, has the same taper angle as the outer container side wall 63, and hits the upper region A 1 of the outer container side wall 63. It is touched.

The diameter of the lower end edge 73A of the upper wall portion 73 is larger than the diameter of the upper end edge 74A of the lower wall portion 74. An upper stepped portion 76 is formed between the upper wall portion 73 and the lower wall portion 74. The diameter in the cross section of the lower wall portion 74 is smaller than the diameter of the outer peripheral surface of the outer container 61 in the range from the upper end edge 74A to the lower end edge 74B. And the lower side wall part 74 is formed in the curved shape dented toward the radial inside of the inner container 62 in the longitudinal cross section containing the virtual axis L1.

The lower side wall part 74 has an upper end part 74C, a central part 74D, and a lower end part 74E. The upper end portion 74C is a region located below the upper side wall portion 73 and is an upper region of the lower side wall portion 74 including the upper end edge 74A. The lower end portion 74E is a region located below the central portion 74D and is a region below the lower side wall portion 74 including the lower end edge 74B. The central portion 74D is a region located between the upper end portion 74C and the lower end portion 74E, and is an intermediate portion in the vertical direction of the lower side wall portion 74.

An air layer 77 is formed between the lower wall portion 74 and the lower region A2 of the outer container side wall portion 63. The air layer 77 includes a first layer thickness LT1 between the upper end portion 74C and the lower region A2, and a second layer having a layer thickness between the central portion 74D and the lower region A2 that is larger than the first layer thickness LT1. It has a thickness LT2, and a third layer thickness LT3 that is between the lower end 74E and the lower region A2 and is smaller than the second layer thickness LT2. The air layer 77 prevents the impact applied to the outer container 61 in the double container 60 from being transmitted to the inner container 62. In addition, the air layer 77 ensures heat insulation between the outer container 61 and the inner container 62 when hot water or the like is supplied into the inner container 62.

The height (width) of the upper side wall portion 73 in the inner container 62 is less than half the height of the double container 60, preferably 1/3 to 1/12. Further, from the viewpoint of ensuring the thickness of the air layer 77 and ensuring the rigidity of the upper side wall 73, the height is particularly preferably ¼ to ８.
Moreover, it is preferable that the height (width) of the lower side wall part 74 in the inner container 62 is 1/2 or more with respect to the height of the double container 60 from a heat insulating viewpoint.

In the inner container 62, the diameter of the upper end edge 75A of the bottom side wall part 75 located below the lower wall part 74 is smaller than the diameter of the lower end edge 74B of the lower wall part 74. A lower stepped portion 78 is formed between the lower side wall portion 74 and the bottom side wall portion 75. The bottom side wall 75 extends substantially parallel to the virtual axis L 1 of the inner container 62, and the lower end edge 75 B is integrally connected to the inner container bottom 69. The inner container lower surface 79 of the inner container bottom 69 is formed in a curved shape so as to protrude downward, and is separated from the outer container bottom surface 80 of the outer container bottom 65. That is, the inner container 62 is supported by the outer container 61 in a suspended state.

In this double container 60, since the flange portion 66 is fitted to the flange portion 70, the air layer 77 is hermetically sealed between the inner container 62 and the outer container 61. In addition, since the air layer 77 is formed in a series of spaces surrounded by the outer container 61, the inner container side wall 67, and the inner container bottom 69, when hot water or the like is supplied to the inner container 62, the outer layer 77 The heat insulation between the container 61 and the inner container 62 is sufficiently ensured.

The present invention is useful for an environment-friendly container having rigidity, excellent heat insulation, and small amount of paper or synthetic resin, particularly a container for storing instant food such as instant noodles.

1,41,61

Outer container

3,66 Flange (first flange)
4, 20, 30, 42, 62

Inner container

5,70 Flange (second flange)
7 Upper side wall 8 Air gap (air layer)
9 Lower side wall 11a Base 21a Upper end 21b Center 21c Lower end 40 Double container 43 Outer container side wall 48 Inner container bottom (lower inner container)
49 Upper side wall portion 49A Lower end edge 50 Lower side wall portion 50A Upper end edge 51 Bottom side wall portion 51C Upper end portion 51D Center portion 51E Lower end portion 52 Upper step portion 53 First air layer (air layer)
54 Lower step portion 55 Inner container lower surface 74C Upper end portion 74D Center portion 74E Lower end portion 77 Air layer A1 Upper region A2 Lower region L1 Virtual axis TH1 First layer thickness TH2 Second layer thickness TH3 Third layer thickness

Claims

A double container,
A paper outer container including an upper region and a lower region located below the upper region and including a tapered side wall portion;
An upper wall portion that contacts the upper region, and a lower wall portion that is located below the upper wall portion and has an upper end portion, a central portion, and a lower end portion, and is disposed inside the outer container An inner container made of resin;
A first layer thickness between the upper end portion and the lower region; a second layer thickness between the central portion and the lower region and greater than the first layer thickness; and the lower end portion An air layer having a layer thickness between the lower region and a third layer thickness that is less than the second layer thickness;
A double container characterized by containing.
The double container according to claim 1,
The outer container and the inner container are formed as a rotating body having a common virtual axis,
The double-sided container is characterized in that the lower wall part is formed in a curved shape so as to be recessed toward the radially inner side of the inner container.
The double container according to claim 2,
The upper side wall has a lower edge,
The lower wall portion has an upper edge;
The diameter of the upper wall portion at the lower edge is larger than the diameter of the lower wall portion at the upper edge,
The said inner container has an upper level | step-difference part between the said upper wall part and the said lower wall part. The double container characterized by the above-mentioned.
The double container according to claim 2,
The inner container is connected to the bottom side wall, a bottom side wall located below the bottom side wall, a lower step provided between the lower side wall and the bottom side wall, and the bottom side wall. A double container characterized by having a lower part.
The double container according to claim 4,
The thickness of the synthetic resin of the said inner container lower part is larger than the thickness of the said upper side wall part, the said lower side wall part, and the said bottom side wall part. The double container characterized by the above-mentioned.
The double container according to claim 1 or 2,
The outer container has a bottom surface of the outer container,
The inner container has an inner container lower surface that contacts the bottom surface of the outer container,
The inner container is fixed to the outer container by bonding the lower surface of the inner container to the bottom surface of the outer container,
The double-container, wherein the bottom surface of the outer container is fixed to the bottom surface of the inner container with a strength capable of separating the bottom surface of the outer container from the bottom surface of the inner container.
The double container according to claim 1 or 2,
The inner container is fixed to the outer container by adhering the upper side wall to the upper region,
The double container according to claim 2, wherein the upper region is fixed to the upper wall portion by a strength capable of separating the upper region from the upper wall portion.
The double container according to claim 1,
The outer container has an opening, and a first flange provided on the periphery of the opening,
The inner container has a second flange portion that fits into the first flange portion.
A double container according to claim 8,
The outer container has a bottom surface of the outer container,
The inner container has an inner container lower surface that does not contact the bottom surface of the outer container.