JP7516450B2 - container - Google Patents

Description

The present invention relates to a container.

Conventionally, a double-structure container configuration has been disclosed that combines a paper outer container with a synthetic resin inner container. The container holds, for example, food, which may be cooked by supplying hot water into the container or using a microwave oven or the like. After the food is cooked, the user eats the food while holding the container in their hands. For this reason, various technologies have been proposed to ensure high insulation for these containers.

For example, Patent Document 1 discloses a container configuration that includes a container body having a tapered cylindrical body with a diameter that decreases toward the bottom and a reverse tapered band-like portion formed at the upper step, where the diameter narrows, and a paper exterior body formed on the tapered cylindrical body that is wrapped around the container body. The upper part of the tapered cylindrical body is formed by folding inwardly into the cylinder and is pressed against the reverse tapered band-like portion. The lower part of the tapered cylindrical body is formed by folding inwardly into the cylinder and is extended downwardly from the bottom of the container body. According to the technology described in Patent Document 1, a heat insulating effect can be obtained by a simple configuration in which the paper exterior body is wrapped around the container body, and the container body and the paper exterior body can be firmly fixed without using adhesives.

JP 2019-23098 A

However, when eating food stored in these containers, the user may place his/her mouth against the rim (flange) of the container, and therefore, in order to improve the user experience, high thermal insulation is required not only for the body of the container that is held by hand, but also for the flange of the container.
In the technology described in Patent Document 1, the folded portion of the upper edge of the paper outer casing is pressed against the reverse tapered band-shaped portion of the container body, making it easy for the paper outer casing to come into contact with the container body, and there was a risk that a high level of insulation effect would not be obtained, particularly in the flange portion.

Therefore, the present invention aims to provide a container that has a simple structure, achieves high insulation effect, and improves the user's experience when using it.

In order to solve the above problems, the present invention employs the following means.
(1) An outer container having a cylindrical body portion that opens upward and is formed with an upper region and a lower region located below the upper region; an inner container having an engagement portion that engages with the upper region, an upper wall portion that faces the upper region, and a lower wall portion that is located below the upper wall portion and faces the lower region, and is disposed inside the outer container; and a spatial layer including: an upper spatial layer that is provided between an upper end portion of the outer container and the inner container and above the upper end portion of the outer container; and a side spatial layer that is provided between the body portion of the outer container and the inner container, wherein the inner container has a brim tip portion that is an upper end portion of the inner container, and the brim tip portion faces radially outward with respect to a central axis line of the inner container; the inner container has a circumferential contact portion between the upper wall portion and the lower wall portion, and the circumferential contact portion a first extension portion that is curved in an arc so as to be convex radially outwardly along the curled portion and extend radially outwardly from the upper end of the outer container , and a second extension portion that is curved in an arc so as to be convex radially inwardly from a lower end of the first extension portion, and the inner container has a chamfered portion between a flat portion provided at an upper end of the inner container and the upper wall portion.

( 2 ) In the container described in ( 1 ) above, the peripheral portion may be provided on the upper region side of the center portion in the height direction of the inner container, and the size of the second layer may be larger than the size of the first layer.

(3) In the container described in either one of (1) or (2) above , a configuration may be adopted in which the upper region of the outer container is sandwiched between the engagement portion and the circumferential contact portion.

( 4 ) In the container described in ( 3 ) above, a configuration may be adopted in which, when the outer container and the inner container are engaged, a portion of the engagement portion is located radially inward from an outer periphery of the curled portion.

( 5 ) In the container described in any one of (1) to ( 4 ) above, a configuration may be adopted in which the engagement portion has a flat portion that is above the upper wall portion and that fits along the opening surface.

( 6 ) In the container described in any one of (1) to ( 5 ) above, a configuration may be adopted in which the outer container and the inner container are formed in a cylindrical shape having a coaxial central axis, and the outer container and the inner container are arranged to be rotatable relative to each other about the central axis.

According to the container of the present invention described in (1) above, in a double-structure container formed by combining an outer container and an inner container, an upper space layer is provided between the upper end of the outer container and the inner container. This allows an air insulation layer to be provided between the outer container and the inner container at the upper end corresponding to the flange of the container, thereby improving the insulation performance of the container. In particular, when a user uses the container by placing his/her mouth on the flange of the container, the improved insulation performance of the flange can improve the mouthfeel. In addition, a side space layer is provided between the body part of the outer container and the inner container. This allows the insulation performance of the body part of the container held by the user's hand to be improved. Since the inner container has an engagement part that engages with the upper region of the outer container, the inner container and the outer container can be easily combined, and the space layer can be easily provided by simply engaging the inner container and the outer container.
Therefore, a container can be provided that has a high heat insulating effect with a simple configuration and improves the user's usability.
In addition, a circumferential contact portion is provided between the upper wall portion and the lower wall portion, and the circumferential contact portion abuts against the outer container. In addition, a first layer is provided above the circumferential contact portion, and a second layer is provided below the circumferential contact portion. In this way, by providing the circumferential contact portion on the inner container, the rigidity of the inner container can be increased, and the side space layer can be divided into a first layer and a second layer. Since the first layer is provided in the upper region, an air insulation layer due to the first layer is provided in the upper region where the flange portion is provided, and the insulation performance of the container can be improved. This improves the insulation performance of the flange portion and improves the mouthfeel. Since the second layer is provided in the lower region, the insulation performance of the body portion of the container held by the user's hand can be improved.
Furthermore, since the circumferential contact portion abuts against the outer container from the inside, when an external force is applied from the outside of the container, for example, when a user holds the container in his/her hand, the inner container and the outer container can be prevented from coming close to each other. This prevents the thickness of the side space layer from decreasing. Therefore, the heat insulating effect can be maintained at a high level with a simple configuration, and the rigidity and stability of the container can be improved.

According to the container of the present invention described in ( 2 ) above, the circumferential contact portion is provided on the upper region side of the center in the height direction, and the size of the second layer is larger than the size of the first layer. By providing the circumferential contact portion on the upper region side, the circumferential contact portion and the engagement portion are disposed at positions close to each other in the height direction. This allows the circumferential contact portion and the engagement portion to sandwich the portion located in the upper region of the outer container from both sides in the thickness direction. Therefore, the engagement strength of the engagement portion can be improved. In addition, by providing the circumferential contact portion on the upper region side, the rigidity of the inner container near the upper region can be increased. Therefore, the thickness of the first layer can be prevented from decreasing due to deformation of the inner container, etc., and the mouthfeel of the user can be improved.

According to the container of the present invention described in ( 3 ) above, the outer container has a curled portion that engages with the engaging portion, and in a state before the outer container and the inner container are engaged by the engaging portion (hereinafter referred to as the intermediate product state), the body portion of the outer container is sandwiched between the engaging portion and the circumferential portion of the inner container. Since the outer container has a curled portion, the engagement strength of the engaging portion can be increased compared to a case in which the outer container is formed without a curled portion. Since the engaging portion is engaged along the curled portion, the mouthfeel at the flange portion can be improved. In addition, the rigidity of the upper region can be increased by forming the brim tip of the inner container along the curled portion. Furthermore, since an insulating layer of air is formed by the curled portion, the insulating performance of the flange portion of the container can be further improved.
In the intermediate product state, the body of the outer container is sandwiched between the engagement portion and the circumferential contact portion of the inner container. This allows the inner container and the outer container to be temporarily fixed when, for example, a flange portion is formed on the edge portion by an engagement operation during manufacturing. Therefore, the positions of the inner container and the outer container are unlikely to shift when they are engaged, which makes it possible to suppress the occurrence of product defects when the flange portion is formed.

According to the container of the present invention described in ( 4 ) above, it is possible to provide a container with improved usability for the user.

According to the container of the present invention described in ( 5 ) above, the engagement portion has a flat portion that fits along the opening surface. This increases the contact area with the lid and improves the sealing performance when a separate lid or the like is provided to close the opening of the container. In addition, the attachment strength of the lid can be improved, and the rigidity of the entire product including the lid and the container can be increased.

According to the container of the present invention described in ( 6 ) above, the outer container and the inner container are provided so as to be rotatable relative to each other without being completely fixed by, for example, adhesion or the like. In this way, since the outer container and the inner container are combined so as to be rotatable relative to each other, air can be circulated between the outer container and the inner container without being sealed between them by adhesion or the like. By increasing the air permeability, the insulation performance between the outer container and the inner container can be improved. In addition, since the outer container and the inner container can be prevented from being deformed by being adhered, the rigidity of the container can be improved and the mouthfeel can be improved. Furthermore, since the adhesion process is not required, the manufacturing process can be reduced. Therefore, a container that realizes high insulation effect and improved usability for the user can be obtained by a simple configuration.

FIG. 2 is a partial cross-sectional view of a container according to an embodiment. FIG. 2 is an enlarged view of part A in FIG. FIG. 2 is an enlarged view of part A in FIG. 1 in an intermediate product state.

The following describes an embodiment of the present invention with reference to the drawings. In the following description, components having the same or similar functions are given the same reference numerals. Duplicate descriptions of those components may be omitted. In the following description, up and down correspond to up and down in the vertical direction of gravity.

(container)
Fig. 1 is a partial cross-sectional view of a container 1 according to an embodiment of the present invention. Fig. 2 is an enlarged view of a portion A in Fig. 1.
As shown in Fig. 1, the container 1 is used as a packaging container for foods that are served at relatively high temperatures, such as various types of noodles, such as udon, soba, and ramen, as well as soups and side dishes. The container 1 is used, for example, as a packaging container for chilled foods. In addition, the container 1 is also used as a container for instant foods that are eaten by adding hot water, for example. A user supplies hot water into the container 1 or cooks the food using a microwave oven or the like, and then eats the food while holding the container 1 in his or her hand.

The container 1 is formed in a cup shape having an opening 6 that opens upward. The container 1 of this embodiment is formed in a cylindrical shape with a diameter that decreases from the top to the bottom in the vertical direction. The container 1 has a double container structure in which a paper outer container 2 and a synthetic resin inner container 3, which will be described in detail later, are stacked together. A flange portion 7 is provided at the upper end of the container 1 where the opening 6 is located. The flange portion 7 is the peripheral portion of the container 1 that comes into contact with the user's mouth when, for example, the user places his/her mouth directly on the container 1 to eat food in the container 1.
The container 1 has an outer container 2, an inner container 3, and a space layer 4.

(Outer container)
The outer container 2 is made of a paper material such as thick paper or cardboard. The outer container 2 is formed in a cup shape that opens upward. The outer container 2 has a body portion 20 and an outer bottom portion 21.
The body 20 is formed in a cylindrical shape centered on a central axis O along the vertical direction. The diameter of the body 20 gradually decreases from the upper portion, where the opening 6 is located, toward the lower portion. The body 20 has an upper region 22 provided at the upper portion in the vertical direction (the opening 6 side), and a lower region 23 provided below the upper region 22. In the following description, the direction perpendicular to the central axis O may be referred to as the radial direction, and the direction around the central axis O may be referred to as the circumferential direction.

The upper region 22 is the portion that is mainly in contact with the user's mouth when, for example, the user eats food from the container 1. The upper end of the upper region 22 forms an opening 6. As shown in FIG. 2, a curled portion 24 is provided at the upper end of the upper region 22. The curled portion 24 is formed in a tubular shape having a central axis along the periphery of the outer container 2 by winding the upper end of the body portion 20 (i.e., the upper end of the upper region 22) toward the outer diameter side of the outer container 2. The curled portion 24 is formed around the entire circumferential circumference of the outer container 2. The curled portion 24 constitutes the flange portion 7 of the container 1.

As shown in FIG. 1, the lower region 23 is a portion of the body 20 that is located below the upper region 22. The lower region 23 is a portion that is primarily held by a user with his or her hand when the user eats food in the container 1, for example. In this embodiment, the height dimension L2 of the lower region 23 in the vertical direction is greater than the height dimension L1 of the upper region 22 in the vertical direction.

The outer bottom 21 is provided at a position corresponding to the lower end of the body 20. When viewed from the top-bottom direction, the outer bottom 21 is formed in a circular shape centered on the central axis O. The outer periphery of the outer bottom 21 is connected to the lower region 23. As a result, the outer bottom 21 closes the lower opening of the body 20. In this embodiment, the outer bottom 21 is provided above the lowermost end 25, which is located at the bottommost position of the lower region 23, in the top-bottom direction. The outer bottom 21 may be provided at the same position as the lowermost end 25 of the lower region 23 in the top-bottom direction.

(Inner container)
The inner container 3 is placed inside the outer container 2 and overlapped therewith. The inner container 3 is made of a synthetic resin material such as polyethylene, polypropylene, or polystyrene. The inner container 3 is formed in a cup shape that opens upward and has a central axis O that is coaxial with the outer container 2. When the outer container 2 and the inner container 3 are placed overlapping each other, the outer container 2 and the inner container 3 are rotatable about the central axis O. The inner container 3 has a side wall portion 30 and an inner bottom portion 31.
The side wall portion 30 is formed in a cylindrical shape centered on the central axis O. The diameter of the side wall portion 30 is smaller than the diameter of the body portion 20 of the outer container 2. The side wall portion 30 is provided along the body portion 20 of the outer container 2. The side wall portion 30 has an upper wall portion 32, a lower wall portion 33, a circumferential contact portion 35, and an engagement portion 34.

The upper wall portion 32 is provided at a position corresponding to the upper region 22 of the outer container 2 in the vertical direction. The upper wall portion 32 is formed in a cylindrical shape. The upper wall portion 32 is disposed opposite the upper region 22 of the outer container 2 with a predetermined gap on the inner diameter side. The diameter of the upper wall portion 32 gradually increases from the top to the bottom.

The lower wall portion 33 is provided at a position corresponding to the lower region 23 of the outer container 2 in the vertical direction. The lower wall portion 33 is formed in a cylindrical shape. The lower wall portion 33 is disposed opposite the lower region 23 of the outer container 2 with a predetermined gap on the inner diameter side. The diameter of the lower wall portion 33 gradually decreases from the top to the bottom.

The circumferential contact portion 35 is provided between the upper wall portion 32 and the lower wall portion 33. The circumferential contact portion 35 protrudes toward the outer diameter side of the container 1. The circumferential contact portion 35 abuts against the inner surface of the outer container 2. The circumferential contact portion 35 is formed around the entire circumference of the inner container 3. The upper wall portion 32 and the lower wall portion 33 are connected via the circumferential contact portion 35. The circumferential contact portion 35 is located closer to the upper region 22 of the outer container 2 (closer to the opening 6) than the center in the height direction (vertical direction) of the inner container 3. In other words, the boundary between the upper region 22 and the lower region 23 of the outer container 2 is located closer to the opening 6 than the center of the outer container 2.

2, the engagement portion 34 is connected to the upper end of the upper wall portion 32 and is integral with the upper wall portion 32. The engagement portion 34 engages with the upper region 22 of the outer container 2. Specifically, the engagement portion 34 engages with the curled portion 24 of the outer container 2 by being heat crimped along the curled portion 24. The engagement portion 34 constitutes the flange portion 7 of the container 1. The engagement portion 34 has a flat portion 37 connected to the upper end of the upper wall portion 32, a first extension portion 38 connected to the flat portion 37, and a second extension portion 39 connected to the first extension portion 38.

The flat portion 37 is provided above the upper wall portion 32. The flat portion 37 extends from the upper end of the upper wall portion 32 toward the outer diameter side of the inner container 3. The flat portion 37 is located above the curled portion 24 of the outer container 2. The outer diameter side end of the flat portion 37 extends to a position equivalent to the outer periphery 24a of the curled portion 24 in the radial direction. The flat portion 37 is the uppermost portion of the inner container 3, and its upper surface is formed in a flat shape that is approximately parallel to a plane perpendicular to the central axis O. The flat portion 37 is provided along the opening surface of the opening 6. For example, when a lid (not shown) is separately provided to close the opening 6 of the container 1, the flat portion 37 abuts against the lower surface of the lid.

The first extension portion 38 is connected to the end portion on the outer diameter side of the flat portion 37. The first extension portion 38 is curved downward from the end portion on the outer diameter side of the flat portion 37 so as to be convex toward the outer diameter side along the shape of the curled portion 24. The first extension portion 38 is provided on the outer diameter side of the curled portion 24. The first extension portion 38 is connected to the flat portion 37 without having a corner between them.

The second extension portion 39 is connected to the lower end of the first extension portion 38. The second extension portion 39 is curved from the lower end of the first extension portion 38 toward the inner diameter side along the lower end of the curled portion 24. The second extension portion 39 is provided below the curled portion 24. The second extension portion 39 is connected to the first extension portion 38 without having a corner between them.

The end of the second extension 39 opposite to the end connected to the first extension 38 is the flange tip 36, which is also the end on the opening 6 side of the inner container 3. The flange tip 36 faces the inner diameter side of the inner container 3. The flange tip 36 is located at least on the inner diameter side of the outer periphery 24a of the curled portion 24. In this embodiment, the flange tip 36 abuts against the outer periphery of the body portion 20 of the outer container 2. This prevents the flange tip 36 of the inner container 3 from protruding outside the container 1.

The engagement portion 34 thus formed surrounds the curled portion 24 of the outer container 2 with the flat portion 37, the first extension portion 38, and the second extension portion 39, and sandwiches the upper region 22 of the outer container 2 between itself and the upper wall portion 32. This causes the curled portion 24 and the engagement portion 34 to be thermally crimped, and the inner container 3 and the outer container 2 are engaged with each other so that they cannot be separated. When the outer container 2 and the inner container 3 are engaged with each other by the engagement portion 34 (hereinafter referred to as the final product state), the outer container 2 and the inner container 3 are capable of rotating around the central axis O of each other.

Returning to FIG. 1, the inner bottom 31 is connected to the lower end of the side wall 30. The inner bottom 31 is disposed facing the outer bottom 21 with a gap therebetween above the outer bottom 21. When viewed from the top-bottom direction, the inner bottom 31 is formed in a circular shape centered on the central axis O. The inner bottom 31 and the side wall 30 are integrally formed, for example, by injection molding, blow molding, compression molding, or the like.

(Spatial layer)
The space layer 4 is provided between the outer container 2 and the inner container 3. In this embodiment, the space layer 4 is filled with air. The space layer 4 forms an insulating layer of air, thereby suppressing heat transfer between the outer container 2 and the inner container 3.
The space layer 4 includes a top space layer 9 , a side space layer 10 , and a bottom space layer 8 .

As shown in FIG. 2, the upper space layer 9 is provided between the upper end of the outer container 2 and the inner container 3. Specifically, the upper space layer 9 is provided above the curled portion 24 of the outer container 2 and below the flat portion 37 of the inner container 3, between the curled portion 24 and the engagement portion 34. Therefore, the curled portion 24 and the flat portion 37 are arranged opposite each other with a gap of a predetermined size (i.e., the upper space layer 9) between them that allows air to flow between them.

1 and 2 , the side space layer 10 is provided between the body portion 20 of the outer container 2 and the side wall portion 30 of the inner container 3. The side space layer 10 has a first layer 11 and a second layer 12.
The first layer 11 is located above the peripheral contact portion 35. The first layer 11 is provided between the upper region 22 of the body portion 20 and the upper wall portion 32 of the inner container 3. The height dimension of the first layer 11 in the vertical direction is equal to the height dimension L1 of the upper region 22 in the vertical direction.
The second layer 12 is located below the circumferential contact portion 35. The second layer 12 is provided between the lower region 23 of the body 20 and the lower wall portion 33 of the inner container 3. The height dimension of the second layer 12 in the vertical direction is equal to the height dimension L2 of the lower region 23 in the vertical direction. In this embodiment, the size of the second layer 12 is larger than the size of the first layer 11. Here, the sizes of the first layer 11 and the second layer 12 refer to the height dimensions and volumes of each layer 11, 12 in the vertical direction. In other words, the height dimension L2 of the second layer 12 in the vertical direction is larger than the height dimension L1 of the first layer 11 in the vertical direction, and the volume of the second layer 12 is larger than the volume of the first layer 11.

As shown in FIG. 1, the bottom space layer 8 is provided between the outer bottom 21 of the outer container and the inner bottom 31 of the inner container 3. The bottom space layer 8 is connected to the side space layer 10. The bottom space layer 8 is provided in the entire area where the outer bottom 21 and the inner bottom 31 face each other. In other words, the outer bottom 21 and the inner bottom 31 are arranged facing each other without contacting each other.

(Assembly of container)
Next, a procedure for assembling the container 1 by combining the outer container 2 and the inner container 3 will be described. Fig. 3 is an enlarged view of part A in Fig. 1 in a state before the outer container 2 and the inner container 3 are engaged with each other by the engaging portion 34 (hereinafter, referred to as an intermediate product state).
In the procedure for assembling the container 1, first, the outer container 2 and the inner container 3, each formed into a cup shape, are prepared. Next, the inner container 3 is placed inside the outer container 2. This state is the intermediate product state. In the intermediate product state, the inner container 3 and the outer container 2 are detachable from each other. Finally, the outer container 2 and the inner container 3 are engaged (thermally crimped) by the engaging portion 34. This completes the container 1 in a state (final product state) in which the inner container 3 and the outer container 2 are inseparably engaged with each other.

As shown in FIG. 3, the outer container 2 and the inner container 3 are stacked on top of each other, and in the intermediate product state before the engagement by the engagement portion 34, the inner container 3 is temporarily fixed to the outer container 2. The container 1 has different shapes and positions (orientations) of the second extension portion 39 and the flange tip portion 36 of the engagement portion 34 between the intermediate product state and the final product state. Specifically, in the intermediate product state, the second extension portion 39 is curved in a semicircular cross section from the lower end of the first extension portion 38 so as to be convex toward the inner diameter side. In the intermediate product state, the flange tip portion 36 is located on the outer diameter side of the outer periphery 24a of the curled portion 24 and faces the outer diameter side of the container 1. At this time, at least a part of the second extension portion 39 is located on the inner diameter side of the outer periphery 24a of the curled portion 24.

In the intermediate product state, the upper region 22 of the outer container 2 is radially sandwiched between a portion of the second extension portion 39 located radially inward from the outer periphery 24a of the curled portion 24 and the circumferential contact portion 35. Thus, the upper region 22 and the curled portion 24 provided thereon are caught between the engagement portion 34 and the circumferential contact portion 35, thereby preventing the upper region 22 and the curled portion 24 from easily coming off.
On the other hand, in the intermediate product state, for example, when a predetermined force is applied in a direction to remove or attach the inner container 3 to the outer container 2, the second extension portion 39 is pushed outwardly by the curled portion 24. This widens the gap between the second extension portion 39 and the circumferential contact portion 35, making it possible to remove or attach the upper region 22 and the curled portion 24 to the engagement portion 34. In other words, the outer container 2 and the inner container 3 are temporarily fixed in a detachable manner.

To change the intermediate product state described above into the final product state, the second extension portion 39 in the intermediate product state is deformed by heat and crimped so that the flange tip portion 36 faces the inner diameter side (state shown in Figure 2). This causes the engagement portion 34 to firmly engage with the curled portion 24, resulting in the final product state in which the inner container 3 and the outer container 2 are inseparably engaged.

(Action, Effect)
According to the above-mentioned container 1, in the double-structure container 1 formed by combining the outer container 2 and the inner container 3, an upper space layer 9 is provided between the upper end of the outer container 2 and the inner container 3. This allows an air insulation layer to be provided between the outer container 2 and the inner container 3 at the upper end corresponding to the peripheral portion (flange portion 7) of the container 1, thereby improving the insulation performance of the container 1. In particular, when a user uses the container 1 by placing his/her mouth against the flange portion 7 of the container 1, the improved insulation performance of the flange portion 7 can improve the mouthfeel. In addition, a side space layer 10 is provided between the body portion 20 of the outer container 2 and the inner container 3. This allows the insulation performance of the body portion 20 of the container 1 held by the user's hand to be improved. The inner container 3 has an engagement portion 34 that engages with the upper region 22 of the outer container 2, so that the inner container 3 and the outer container 2 can be easily combined, and the space layer 4 can be easily provided by simply engaging the inner container 3 and the outer container 2.
The flange tip 36 of the engagement portion 34 faces the inside of the inner container 3. This provides a better mouthfeel when the user places his/her mouth on the flange portion 7 of the container 1, as compared to the conventional technology in which the flange tip 36 faces outward at the flange portion 7 of the container 1.
Therefore, a container 1 can be provided that has a high heat insulating effect with a simple configuration and improves the user's usability.

A circumferential contact portion 35 is provided between the upper wall portion 32 and the lower wall portion 33, and the circumferential contact portion 35 abuts against the outer container 2. In addition, a first layer 11 is provided above the circumferential contact portion 35, and a second layer 12 is provided below the circumferential contact portion 35. In this way, by providing the circumferential contact portion 35 on the inner container 3, the rigidity of the inner container 3 can be increased, and the side space layer 10 can be divided into the first layer 11 and the second layer 12. Since the first layer 11 is provided in the upper region 22, an air insulation layer is provided by the first layer 11 in the upper region 22 where the flange portion 7 is provided, and the insulation performance of the container 1 can be improved. This improves the insulation performance of the flange portion 7 and improves the mouthfeel. Since the second layer 12 is provided in the lower region 23, the insulation performance of the body portion 20 of the container 1 held by the user's hand can be improved.
Furthermore, since the peripheral contact portion 35 abuts against the outer container 2 from the inside, when an external force is applied from the outside of the container 1, for example when a user holds the container 1 with his/her hand, the inner container 3 and the outer container 2 can be prevented from coming close to each other. This prevents the thickness of the side space layer 10 from decreasing. Therefore, the simple configuration can maintain a high heat insulating effect, improve the rigidity of the container 1, and increase its stability.

The circumferential contact portion 35 is provided closer to the upper region 22 than the center in the height direction, and the size of the second layer 12 is larger than the size of the first layer 11. By providing the circumferential contact portion 35 on the upper region 22 side, the circumferential contact portion 35 and the engagement portion 34 are positioned close to each other in the height direction. This allows the circumferential contact portion 35 and the engagement portion 34 to sandwich the portion of the outer container 2 located in the upper region 22 from both sides in the thickness direction. This improves the engagement strength of the engagement portion 34. In addition, by providing the circumferential contact portion 35 on the upper region 22 side, the rigidity of the inner container 3 near the upper region 22 can be increased. This prevents the thickness of the first layer 11 from decreasing due to deformation of the inner container 3, etc., and improves the feel in the mouth of the user.

The outer container 2 has a curled portion 24 that engages with the engagement portion 34, and in a state before the outer container 2 and the inner container 3 are engaged by the engagement portion 34 (intermediate product state), the body portion 20 of the outer container 2 is sandwiched between the engagement portion 34 and the circumferential portion 35 of the inner container 3. Since the outer container 2 has the curled portion 24, the engagement strength by the engagement portion 34 can be increased compared to when the outer container 2 is formed without the curled portion 24. By engaging the engagement portion 34 along the curled portion 24, the flange tip portion 36 of the inner container 3 is prevented from protruding outward, and the mouthfeel at the flange portion 7 can be improved. In addition, by forming the flange tip portion 36 of the inner container 3 along the curled portion 24, the rigidity of the upper region 22 can be increased. Furthermore, since an insulating layer of air is formed by the curled portion 24, the insulating performance at the flange portion 7 of the container 1 can be further improved.

In the intermediate product state, the body 20 of the outer container 2 is sandwiched between the engagement portion 34 and the peripheral contact portion 35 of the inner container 3. This allows the inner container 3 and the outer container 2 to be temporarily fixed together, for example, when forming the flange portion 7 on the peripheral portion by an engagement operation during manufacturing. This makes it difficult for the inner container 3 and the outer container 2 to shift positions when engaging, thereby suppressing the occurrence of product defects when forming the flange portion 7.

When the outer container 2 and the inner container 3 are engaged, the flange tip 36 of the inner container 3 is located inside the inner container 3 relative to the outer periphery 24a of the curled portion 24. This provides a better mouthfeel at the flange 7 of the container 1 compared to the prior art in which the flange tip 36 protrudes outward from the curled portion 24 (i.e., the upper end of the outer container 2).
Therefore, the container 1 can be made to have an improved usability for the user.

The engagement portion 34 has a flat portion 37 that fits along the opening surface. This increases the contact area with the lid and improves sealing performance, for example when a separate lid is provided to close the opening of the container 1. It also improves the attachment strength of the lid, increasing the rigidity of the entire product, including the lid and container 1.

The outer container 2 and the inner container 3 are provided so as to be rotatable relative to each other, without being completely fixed, for example, by adhesion. In this way, the outer container 2 and the inner container 3 are combined so as to be rotatable relative to each other, so that the outer container 2 and the inner container 3 are not sealed by adhesion or the like, and air can circulate between them. By increasing the air permeability, the insulation performance between the outer container 2 and the inner container 3 can be improved. In addition, by bonding, deformation of the outer container 2 and the inner container 3 can be suppressed, so the rigidity of the container 1 can be improved and the mouthfeel can be improved. Furthermore, since the bonding process is unnecessary, the manufacturing process can be reduced. Therefore, a container 1 can be made that has a high insulation effect and an improved usability for the user due to its simple configuration.

The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
In the above embodiment, the circumferential contact portion 35 is configured to be provided around the entire circumference in the circumferential direction, but this is not limited to the above. For example, the circumferential contact portion 35 may be provided at multiple locations spaced apart from each other along the circumferential direction.
Furthermore, the height position of the circumferential contact portion 35 in the up-down direction is not limited to that in the above-described embodiment.

The inner container 3 may be formed without having a peripheral contact portion 35. In other words, the side space layer 10 may have only the first layer 11. However, the configuration of this embodiment having a peripheral contact portion 35 is advantageous in that the upper region 22 of the body portion 20 can be temporarily fixed in an intermediate product state by sandwiching it between the peripheral contact portion 35 and the engagement portion 34, and in that the rigidity of the container 1 can be improved.

The materials of the outer container 2 and the inner container 3 are not limited to those in the above-described embodiment.
The shape of the container 1 does not have to be cylindrical. In other words, in a cross-sectional view perpendicular to the central axis O, the outer shape of the container 1 may be formed to have a shape other than a circle, such as a rectangle, a polygon, or an ellipse.

In addition, the components in the above-described embodiments may be replaced with well-known components as appropriate without departing from the spirit of the present invention, and the above-described embodiments and variations may be combined as appropriate.

1: container, 2: outer container, 3: inner container, 4: space layer, 9: upper space layer, 10: side space layer, 11: first layer, 12: second layer, 20: body part, 22: upper region, 23: lower region, 24: curled part, 24a: outer periphery (of curled part), 32: upper wall part, 33: lower wall part, 34: engagement part, 35: circumferential contact part, 36: flange tip part, 37: flat part, O: central axis

Claims (6)

an outer container having a cylindrical body portion that opens upward and has an upper region and a lower region located below the upper region;
an inner container disposed inside the outer container, the inner container having an engagement portion that engages with the upper region, an upper wall portion that faces the upper region, and a lower wall portion that is located below the upper wall portion and faces the lower region;
a space layer including an upper space layer provided between an upper end of the outer container and the inner container and above the upper end of the outer container, and a side space layer provided between the body portion of the outer container and the inner container;
Equipped with
The inner container has a flange tip portion which is an upper end portion of the inner container,
The flange tip portion faces radially outward with respect to the central axis of the inner container,
The inner container has a periphery between the upper wall portion and the lower wall portion,
The peripheral contact portion abuts against the outer container,
The side space layer comprises:
a first layer located above the circumferential portion and between the upper region of the body portion and the upper wall portion;
a second layer located below the circumferential portion and between the lower region of the body portion and the lower wall portion;
having
The circumferential contact portion protrudes radially outward ,
the outer container has a curled portion at an upper end of the upper region, the curled portion being engaged with the engaging portion and having a central axis along a periphery of the outer container;
The engagement portion has a first extension portion curved in an arc shape so as to be convex radially outward along the curled portion, and a second extension portion curved in an arc shape so as to be convex radially inward from a lower end of the first extension portion,
The container according to claim 1, wherein the inner container has a chamfered portion between a flat portion provided at an upper end of the inner container and the upper wall portion . 2. The container of claim 1,
The peripheral portion is provided on the upper region side of the center portion in the height direction of the inner container,
A container, wherein the second layer is larger in size than the first layer. 3. The container according to claim 1 or 2 ,
A container characterized in that the upper region of the outer container is sandwiched between the engaging portion and the peripheral contact portion. 4. The container of claim 3,
In a state in which the outer container and the inner container are engaged with each other,
A container, characterized in that a portion of the engagement portion is located radially inward from an outer periphery of the curled portion. A container according to any one of claims 1 to 4,
A container characterized in that the engagement portion has a flat portion along an opening surface above the upper wall portion. A container according to any one of claims 1 to 5,
The outer container and the inner container are formed into a cylindrical shape having a coaxial central axis,
A container characterized in that the outer container and the inner container are arranged to be rotatable relative to each other about the central axis.