JP2016030611A - Heat insulation container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce heat radiation from a contact zone of a container body part and a lid body part.SOLUTION: A heat insulation container includes: a container body part; a lid body part which covers the container body part; a first metal plate which is provided on the container body part and has a radiation prevention effect; and a second metal plate which is provided on the lid body part and has a radiation prevention effect. In a direction from a storage space CP which is formed of the container body part and the lid body part, toward an exterior, a cavity 31 is formed at least at one portion of the container body part and the lid body part in which neither the first metal plate nor the second metal plate is present.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a heat retaining container that retains and retains contents such as heated food in a housing space formed by a container body and a lid. Specifically, the present invention relates to a heat retaining container that is provided with a metal plate having a radiation preventing effect on the container main body and the lid body, respectively, and that keeps the heat by reflecting radiation from the heated contents.

  Conventionally, heat insulation containers having various configurations have been proposed as heat insulation containers having a container main body and a lid body. For example, the heat insulating container described in Patent Document 1 is composed of a container body and a lid, and the container body and lid are each composed of a box-shaped body and three layers. Specifically, the container main body includes a box-shaped main body that forms the innermost housing portion, an alumina ceramic layer attached outside the box-shaped main body, and a reflective metal plate attached outside the layer. It is comprised from the layer and the heat insulating material layer armored on the outer side of the metal plate layer. The box-shaped main body is formed from polypropylene, the metal plate layer is formed from aluminum foil, and the heat insulating material layer is formed from expanded polystyrene. Similarly to the container main body, the lid is also composed of a box-shaped main body, an alumina ceramic layer, a reflective metal plate layer, and a heat insulating material layer.

  The heat insulation container described in Patent Document 1 is more effective than the heat insulation container composed of only a box-shaped main body because of the action of the three layers of the alumina ceramic layer, the reflective metal plate layer, and the heat insulation material layer. The heat radiated through the box-shaped body can be reduced.

No. 7-54140

  In the cross-sectional structure of the heat insulating container illustrated in Patent Document 1, when the container main body is covered with the lid body, the alumina ceramic layer, the reflective metal plate layer, the heat insulating material layer of the container main body, and the lid body The alumina ceramic layer, the reflective metal plate layer, and the heat insulating material layer extend to the contact portions of the container main body and the lid body, respectively. However, in the case of using a thermal insulation container or cleaning, various chemical substances may enter between the three layers. Therefore, in the thermal insulation container that is actually commercialized, the container main body and the lid It is considered that the exposed portions of the three layers are covered by the box-shaped main body or other member at the contact portion of the body part. When the exposed portions of the three layers are covered, the heat from the contents stored in the heat insulating container may be released to the outside through the covering member, which may reduce the heat insulating effect of the heat insulating container. is there.

  Then, this invention is made in view of said situation, and it aims at providing the heat retention container which can reduce the thermal radiation from the contact location of a container main-body part and a cover body part.

  In order to achieve the above-described object, the invention according to claim 1 includes a container body, a lid that covers the container body, a first metal plate that is provided in the container body and has a radiation preventing effect. A second metal plate provided on the lid body and having a radiation preventing effect, and in the direction from the housing space formed by the container main body and the lid body to the outside, the first metal plate and the second metal plate In this configuration, a cavity is formed in at least one location of the container body portion or the lid portion where no metal plate exists.

  In the aspect of the present invention, the shape of the heat insulating container is not limited, and may be, for example, a cubic shape or a cylindrical shape. Moreover, the kind of the content accommodated in a heat insulation container is not limited, either, foodstuffs, such as rice, and liquids, such as coffee, may be sufficient.

  In the aspect of the present invention, the configuration of the heat retaining container is not limited as long as it is configured to include a container main body portion and a lid body portion. For example, the lid part may be configured to cover the opening part by being placed on the opening part of the container body part, or the opening part may be fitted into the opening part of the container body part. The form which covers may be sufficient.

  In the aspect of the present invention, if the first metal plate and the second metal plate have a radiation preventing effect of reflecting radiation from the contents, the surfaces thereof are subjected to special processing such as mirror surface processing and plating processing. It is not limited to what was done. The first metal plate and the second metal plate may be the same type of metal plate or different types of metal plates.

  In the aspect of the present invention, the configuration for holding the metal plate is not limited as long as the first metal plate and the second metal plate are provided in the container main body portion and the lid body portion. For example, if the container body is configured by assembling an inner member and an outer member, the first metal plate may be sandwiched and held between two members, It may be configured to be bonded and held on one of the members.

  In the aspect of the present invention, the location where the cavity is formed may be at least one location of the container main body portion or the lid portion where neither the first metal plate nor the second metal plate exists, but heat dissipation from the contents It is preferable that it is the location of the peripheral part of the opening part of the container main-body part considered that is large. Moreover, if the location where the cavity is formed exists in at least one location of the container main body portion or the lid portion where neither the first metal plate nor the second metal plate exists, the location where the cavity is formed In addition, the first metal plate and the second metal plate may be present at a location of the container main body portion or the lid body portion.

  In the aspect of the present invention, the method for forming the cavity inside the wall portion constituting the container main body portion or the lid body portion is not limited. For example, a method of injecting an inert gas into the wall portion by a gas assist molding method is used.

  In a specific aspect of the present invention, the container main body includes an inner main body and an outer main body assembled to the inner main body in a state where a first space is formed between the inner main body and the lid. The body portion includes an inner lid body portion and an outer lid body portion assembled to the inner lid body portion in a state in which a second space is formed between the inner lid body portion and the first metal plate is the first space. The first metal plate and the second metal are disposed in the second space, and the second metal plate is disposed in the second space and is directed outward from the housing space formed by the container main body portion and the lid body portion. A cavity is formed in at least one location of the inner body portion, the outer body portion, the inner lid portion, or the outer lid portion without any of the plates.

  In this specific aspect, the location where the cavity is formed is at least one of an inner body portion, an outer body portion, an inner lid portion, or an outer lid portion where neither the first metal plate nor the second metal plate exists. If present at the location, the location where the cavity is formed is the inner body portion, the outer body portion, the inner lid portion, or the outer lid portion where either the first metal plate or the second metal plate exists. It may exist in a place.

  In a specific aspect of the present invention, the inner body portion includes an inner body bottom portion and an inner body side portion extending up and extending from the inner body bottom portion, and the outer body portion includes an outer body bottom portion and an outer body bottom portion. The first metal plate includes a bottom plate portion disposed in a space formed between the inner main body bottom portion and the outer main body bottom portion, and the inner main body side portion and the outer main body side portion. And a side plate portion disposed in a space formed between the two.

  In this specific embodiment, the bottom plate portion and the side plate portion of the first metal plate may be configured integrally or may be configured separately.

  According to a specific aspect of the present invention, the gas is injected into the inner body portion, the outer body portion, the inner lid portion, or the outer lid portion where the cavity is formed. An injection part is provided.

  According to a specific aspect of the present invention, in order to regulate the direction in which the gas injected from the injection portion flows, an extension portion formed to be connected to the injection portion is provided.

  According to a specific aspect of the present invention, the plurality of main body injection portions are respectively formed on two opposing surfaces of the inner main body portion and the outer main body portion, and the inner main body portion and the outer main body portion extend in a direction that extends. Placed apart.

  In this specific aspect, the distance between the plurality of main body injection parts is a distance at which the adjacent main body injection parts do not interfere when the inner main body part and the outer main body part are assembled.

  According to a specific aspect of the present invention, the plurality of lid injecting portions are respectively formed on two opposing surfaces of the inner lid portion and the outer lid portion, and the inner lid portion and the outer lid portion are formed on the two surfaces. They are arranged away from each other in the direction of spreading and extending.

  In this specific aspect, the distance from which the plurality of lid injection parts are separated is a distance at which the adjacent lid injection parts do not interfere when the inner lid part and the outer lid part are assembled.

  According to a specific aspect of the present invention, the bottom plate portion of the first metal plate has a cutout portion into which each injection portion of the plurality of main body injection portions is fitted.

  In this specific aspect, in order to enhance the radiation prevention effect, it is preferable that the size of the notch is as small as possible.

  According to a specific aspect of the present invention, the second metal plate has a cutout portion into which each injection portion of the plurality of lid injection portions is fitted.

  In this specific aspect, in order to enhance the radiation prevention effect, it is preferable that the size of the notch is as small as possible.

  In the first aspect of the present invention, the container main body portion or the lid in which neither the first metal plate nor the second metal plate exists in the direction from the housing space formed by the container main body portion and the lid body portion to the outside. A cavity is formed in at least one location of the body part. As a result, the heat released from the container body portion or the lid portion where neither the first metal plate nor the second metal plate exists is reduced by the formation of the cavity.

  In a specific aspect according to claim 2, in the direction from the housing space formed by the container main body portion and the lid body portion toward the outside, neither the first metal plate nor the second metal plate exists, A cavity is formed in at least one location of the outer body portion, the inner lid portion, or the outer lid portion. As a result, the heat released from the inner body part, the outer body part, the inner lid part, or the outer lid part where neither the first metal plate nor the second metal plate exists is reduced by the formation of the cavity. The

  According to a specific aspect of the present invention, the bottom plate portion of the first metal plate is disposed in a space formed between the inner main body bottom portion and the outer main body bottom portion. The side plate portion of the first metal plate is disposed in a space formed between the inner main body side portion and the outer main body side portion. As a result, heat radiation from the bottom and side portions of the container main body can be reduced.

  According to a specific aspect of the present invention, the injection part into which the gas is injected is a part of the inner body part, the outer body part, the inner lid part, or the outer lid part, where the cavity is formed. Formed. As a result, when the inner body part, the outer body part, the inner lid part, or the outer lid part is molded, the cavity can be easily formed by injecting the gas from the injection part.

  According to a specific aspect of the present invention, the extension portion is formed in connection with the injection portion in order to regulate the direction in which the gas injected from the injection portion flows. As a result, the gas injected from the injection part flows along the extension part, so that the cavity can be formed at a desired position.

  In the specific aspect of Claim 6, a some main body injection | pouring part is arrange | positioned away in the direction where an inner side main-body part and an outer side main-body part spread and extend. As a result, when the inner body portion and the outer body portion are assembled, it is possible to avoid interference between the plurality of body injection portions, and the inner body portion and the outer body portion can be reliably assembled.

  According to a specific aspect of the present invention, the plurality of lid injecting portions are arranged apart from each other in a direction in which the inner lid portion and the outer lid portion extend and extend. As a result, when the inner lid body portion and the outer lid body portion are assembled, it is possible to avoid interference between the plurality of lid body injection portions, and the inner lid body portion and the outer lid body portion can be reliably assembled. it can.

  In a specific aspect of the present invention, each injection portion of the plurality of main body injection portions is fitted into a notch portion of the bottom plate portion of the first metal plate. As a result, since it is not necessary to form each injection portion at a position away from the first metal plate, the mold for forming the inner body portion and the outer body portion has a more complicated shape depending on the formation position of each injection portion. Can be avoided.

  In the specific aspect of the ninth aspect, each injection portion of the plurality of lid injection portions is fitted into the cutout portion of the second metal plate. As a result, since it is not necessary to form each injection portion at a position away from the second metal plate, the mold for forming the inner lid portion and the outer lid portion is more complicated depending on the formation position of each injection portion. It can avoid becoming a shape.

It is a longitudinal cross-sectional view which shows the inside of the container main-body part 2 and the cover body part 3 of the heat retention container 1 which concerns on embodiment of this invention. It is a cross-sectional view which shows the inside of the container main-body part 2 and the cover body part 3 of the heat retention container 1 cut | disconnected according to the L1-L1 line | wire shown in FIG. FIG. 3 is a front view showing the entire appearance of an inner body part 4 of the container body part 2. FIG. 6 is a bottom view of the inner body part 4 of the container body part 2. It is a longitudinal cross-sectional view of the inner side main-body part 4 which follows the L2-L2 line shown in FIG. It is a cross-sectional view of the inner body part 4 according to the L3-L3 line shown in FIG. It is an expanded sectional view of the inner body part 4 according to the L4-L4 line shown in FIG. FIG. 5 is an enlarged cross-sectional view of the inner body part 4 taken along line L5-L5 shown in FIG. 4. FIG. 3 is a front view showing the entire appearance of the outer body part 5 of the container body part 2. FIG. 6 is a top view of the outer main body 5 of the container main body 2. It is a longitudinal cross-sectional view of the outer side main-body part 5 which follows the L6-L6 line shown in FIG. It is a cross-sectional view of the outer body part 5 according to the L7-L7 line shown in FIG. FIG. 4 is a top view of a first metal plate 8 of the heat retaining container 1. FIG. 2 is a front view showing the entire appearance of an inner lid body portion 6 of the lid body portion 3. FIG. 6 is a top view of the inner lid body portion 6 of the lid body portion 3. It is a longitudinal cross-sectional view of the inner side cover part 6 which follows the L8-L8 line | wire shown in FIG. FIG. 16 is a transverse cross-sectional view of the inner lid part 6 taken along line L9-L9 shown in FIG. FIG. 3 is a front view showing the entire appearance of an outer lid body portion 7 of the lid body portion 3. FIG. 6 is a bottom view of the outer lid body portion 7 of the lid body portion 3. It is a longitudinal cross-sectional view of the outer side cover body part 7 which follows the L10-L10 line shown in FIG. FIG. 20 is a transverse cross-sectional view of the outer lid body portion 7 taken along line L11-L11 shown in FIG. 4 is a top view of a second metal plate 9 of the heat retaining container 1. FIG. It is an expanded sectional view which expands and shows area | region R1 shown in FIG. It is an expanded sectional view which expands and shows area | region R2 shown in FIG. It is an expanded sectional view which expands and shows area | region R3 shown in FIG. In the container main body 2, the inner body protrusions A1 to A16, the outer body protrusions C1 to C16, the inner body ribs B1 to B20, the outer body ribs D1 to D8, and the first metal plate 8 are described. FIG. In the lid part 3, it is explanatory drawing which shows the arrangement | positioning relationship between the inner side lid protrusions E1-E17, the outer side lid protrusions F1-F16, and the 2nd metal plate 9. FIG. It is explanatory drawing which shows the relationship between the temperature change of the content, and elapsed time about the heat retention container 1 of this embodiment, and the heat retention container of a comparative example.

<Embodiment>
Hereinafter, a heat insulating container according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view showing the inside of the heat insulating container 1 cut at the center position in the front-rear direction of the heat insulating container 1, and FIG. 2 shows the heat insulating container 1 cut along the line L1-L1 shown in FIG. It is a cross-sectional view showing the inside. In FIG. 1, a heat retaining container 1 is a container having a heat retaining effect over a long period of time, for example, a container used as an aircraft container. Note that the two directions indicated by arrows in FIG. 1 are the up-down direction and the left-right direction, and the directions orthogonal to both directions are the front-rear direction, and each direction is also shown in other drawings in FIG.

[Configuration of heat insulation container 1]
In FIG. 1 and FIG. 2, the heat insulating container 1 has a box shape whose length in the left-right direction is longer than the length in the front-rear direction, and includes a container body 2 and a lid 3. The container main body 2 includes an inner main body 4 and an outer main body 5. The lid body portion 3 includes an inner lid body portion 6 and an outer lid body portion 7. The first metal plate 8 is disposed in the first space S <b> 1 formed by the inner main body portion 4 and the outer main body portion 5. The second metal plate 9 is disposed in the second space S <b> 2 formed by the inner lid body portion 6 and the outer lid body portion 7.

(Detailed configuration of the container body 2)
The inner main body 4 of the container main body 2 is molded from a synthetic resin material. Further, the outer main body 5 of the container main body 2 is also molded from a synthetic resin material. As the synthetic resin material for the inner main body 4 and the outer main body 5, a synthetic resin material is used which ensures safety for food storage and is not easily damaged when the heat retaining container 1 is dropped. In the present embodiment, polypropylene or polyethylene is used as the synthetic resin material for the inner main body 4 and the outer main body 5. In the present embodiment, the length of the container body 2 in the left-right direction is set to 166.2 mm, the width in the front-rear direction is set to 117.0 mm, and the height in the vertical direction is set to 42.1 mm.

(Detailed configuration of the inner body 4)
A detailed configuration of the inner main body 4 will be described with reference to FIGS. 3 to 8. FIG. 3 is a front view showing the entire appearance of the inner main body 4, and FIG. 4 is a bottom view of the inner main body 4. 5 is a longitudinal sectional view taken along line L2-L2 shown in FIG. 4, FIG. 6 is a transverse sectional view taken along line L3-L3 shown in FIG. 4, and FIG. 7 is a sectional view taken along line L4-L4 shown in FIG. FIG. The inner body part 4 includes an inner body bottom part 10 and four inner body side parts 11 to 14. The four inner main body side portions 11 to 14 are formed to rise upward from the inner main body bottom portion 10. Four bent portions 15 to 18 are formed by bending in a state of being folded downward from the upper end portions of the four inner main body side portions 11 to 14. The inner main body 4 defines an accommodation space CP for accommodating contents such as heated food by the inner main body bottom portion 10 and the four inner main body side portions 11 to 14. In the present embodiment, the thickness of the inner main body bottom 10, the thickness of each inner main body side of the four inner main body side portions 11 to 14, and the thickness of each bent portion of the four bent portions 15 to 18 are: , Are set to approximately the same dimensions.

  In FIG. 4, a large number of inner body protrusions A <b> 1 to A <b> 16 are formed protruding downward from the lower surface of the inner body bottom 10. The three inner body protrusions A1 to A3 are arranged close to the inner body side part 11, and the distance in the front-rear direction between each protrusion of the inner body protrusions A1 to A3 and the inner body side part 11 is: The inner main body protrusions A1 to A3 are set smaller than the interval between two adjacent protrusions. Similarly, the three inner main body projections A14 to A16 are also arranged in the vicinity of the inner main body side portion 14, and in the front-rear direction between the inner main body projections A14 to A16 and the inner main body side portion 14. The distance is set to be smaller than the interval between two adjacent protrusions of the inner body protrusions A14 to A16. Further, the three inner body protrusions A7, A9, A13 are arranged close to the inner body side part 12, and between the protrusions of the inner body protrusions A7, A9, A13 and the inner body side part 12. The distance in the left-right direction is set to be smaller than the interval between two adjacent protrusions of the inner main body protrusions A7, A9, A13. Similarly, the three inner body protrusions A4, A8, A10 are arranged close to the inner body side part 13, and between the inner body protrusions A4, A8, A10 and the inner body side part 13. The distance in the left-right direction is set smaller than the interval between two adjacent protrusions of the inner main body protrusions A4, A8, A10.

  Each protrusion of the large number of inner body protrusions A1 to A16 has a circular cross-sectional shape. The tip of each protrusion is formed in a curved shape such as a hemispherical shape. In this embodiment, the diameter of the circular cross section of each protrusion is set to a diameter that is substantially the same as the thickness of the inner body bottom 10 or smaller than the thickness of the inner body bottom 10, for example, Set to 1.5 mm.

  In FIG. 4, a large number of inner body ribs B1 to B20 are formed on two mutually opposed surfaces of four inner body side parts 11 to 14 and four bent parts 15 to 18. The inner body ribs formed on the side parts of the inner body are arranged at intervals so as not to face the inner body ribs formed on the bent parts. For example, the inner body ribs B1, B3, B5 formed on the inner body side part 11 are formed at intervals in a state where they do not face the inner body ribs B2, B4 formed on the bent part 15. Each of the inner body ribs of the large number of inner body ribs B1 to B20 includes a downward inclined portion that is largely inclined upward from below and an upward inclined portion that is continuously inclined downward from the downward inclined portion. . For example, in FIG. 8, the inner main body rib B <b> 11 formed on the inner main body side portion 13 includes a lower inclined portion B <b> 11-1 and an upper inclined portion B <b> 11-2. Further, the inner body rib B12 formed in the bent portion 17 has a downward inclined portion B12-1 and an upward inclined portion B12-2. The interval between the downward inclined portion B11-1 and the downward inclined portion B12-1 decreases upward. The interval between the upper inclined portion B11-2 and the upper inclined portion B12-2 is also slightly reduced upward, and the interval between the uppermost portions of both upper inclined portions is set to a predetermined interval.

  The distal end portion of the upward inclined portion of each of the large number of inner body ribs B1 to B20 has a curved cross-sectional shape. In the present embodiment, the thickness of each rib of the large number of inner body ribs B <b> 1 to B <b> 20 is set to a dimension equal to or less than the thickness of the inner body bottom portion 10.

  As shown in FIGS. 5 and 6, the four connecting bent portions 19 to 22 are formed by being bent downward from the side portions of the four bent portions 15 to 18. The four connecting bent portions 19 to 22 are arranged so as to form predetermined gaps 19A to 22A between the four bent portions 15 to 18.

  In FIG. 4, four gas injection portions 23 to 26 are formed on the lower surface of the inner main body bottom portion 10 in a state of being close to the four corner portions of the inner main body bottom portion 10. The four extending portions 27 to 30 are formed on the lower surface of the inner main body bottom portion 10 in a state of extending from the four gas injection portions 23 to 26 toward the four corners of the inner main body bottom portion 10. The four gas injection portions 23 to 26 include injection ports that open downward. FIG. 8 is an enlarged sectional view taken along line L5-L5 shown in FIG. For example, in FIG. 8, the gas injection part 23 includes an injection port 23A that opens downward.

  In this embodiment, the synthetic resin material melted to mold the inner body portion 4 is filled in the mold, and after the filling is completed, an inert gas such as nitrogen gas is supplied from the inlet of each gas injection portion. Injected. By this inert gas injection, cavities are formed extending from the gas injection portions to the peripheral regions CA11 to CA14 inside the inner main body bottom portion 10 and the inner main body side portions. For example, as shown in FIG. 8, the cavity 31 in the peripheral region CA11 is formed in the inner body bottom 10 so as to extend rightward from the injection port 23A. As shown in FIGS. 7 and 8, the cavity 31 extends upward in the inner main body side portions 11 and 13 from the injection port 23 </ b> A in the direction guided by the extending portion 27, and the bent portions 15 and 17. It is formed to the part located below the upper end part. Cavities similar to the cavities 31 are also formed in the peripheral regions CA12 to CA14 of the other gas injection parts 24 to 26.

(Detailed configuration of the outer body 5)
A detailed configuration of the outer main body 5 will be described with reference to FIGS. 9 to 12. FIG. 9 is a front view showing the entire appearance of the outer main body 5, and FIG. 10 is a top view of the outer main body 5 as viewed from above. 11 is a longitudinal sectional view taken along line L6-L6 shown in FIG. 10, and FIG. 12 is a transverse sectional view taken along line L7-L7 shown in FIG. The outer body part 5 includes an outer body bottom part 40 and four outer body side parts 41 to 44. The four outer body side portions 41 to 44 are formed to rise upward from the outer body bottom portion 40, respectively. In the present embodiment, the thickness of the outer main body bottom portion 40 and the thickness of each outer main body side portion of the four outer main body side portions 41 to 44 are set to substantially the same dimensions.

  In FIG. 10, a large number of outer body protrusions C <b> 1 to C <b> 16 are formed to protrude upward from the upper surface of the outer body bottom 40. The two outer body protrusions C1 and C2 are arranged close to the outer body side part 41, and the distance in the front-rear direction between each protrusion of the outer body protrusions C1 and C2 and the outer body side part 41 is It is set smaller than the interval between each protrusion of the outer body protrusions C1 and C2 and the adjacent protrusions. For example, the distance in the front-rear direction between the outer main body projection C1 and the outer main body side portion 41 is set to be smaller than the interval between the outer main body projection C1 and the adjacent outer main body projection C3. Similarly, the two outer main body projections C15 and C16 are also arranged in the vicinity of the outer main body side portion 44, and in the front-rear direction between the outer main body projection portions C15 and C16 and the outer main body side portion 44. The distance is set to be smaller than the interval between each protrusion of the outer body protrusions C15 and C16 and the adjacent protrusion. For example, the distance in the front-rear direction between the outer main body projection C15 and the outer main body side portion 44 is set to be smaller than the distance between the outer main body projection C15 and the adjacent outer main body projection C13. Further, the two outer body protrusions C7 and C12 are arranged close to the outer body side part 42, and the distance in the left-right direction between each protrusion of the outer body protrusions C7 and C12 and the outer body side part 42 Is set smaller than the interval between each of the protrusions of the outer body protrusions C7 and C12 and the adjacent protrusions. For example, the distance in the left-right direction between the outer body protrusion C7 and the outer body side part 42 is set to be smaller than the distance between the outer body protrusion C7 and the adjacent outer body protrusion C9. Similarly, the two outer main body protrusions C5 and C10 are disposed in the vicinity of the outer main body side part 43, and the right and left direction between the respective protrusions of the outer main body protrusions C5 and C10 and the outer main body side part 43 are arranged. The distance is set to be smaller than the interval between each protrusion of the outer body protrusions C5 and C10 and the adjacent protrusions. For example, the distance in the left-right direction between the outer main body projection C5 and the outer main body side portion 43 is set to be smaller than the interval between the outer main body projection C5 and the adjacent outer main body projection C8.

  Each protrusion of the multiple outer body protrusions C1 to C16 has a circular cross-sectional shape. The tip of each protrusion is formed in a curved shape such as a hemispherical shape. In the present embodiment, the diameter of the circular cross section of each protrusion is set to be approximately the same as the thickness of the outer body bottom 40 or smaller than the wall thickness of the outer body bottom 40. Set to 5 mm.

  In FIG. 10, many outer body ribs D1-D8 are formed in the inner surface of the four outer body side parts 41-44. Each of the outer body ribs of the large number of outer body ribs D1 to D8 includes a lower inclined portion that is slightly inclined upward from below and an upward inclined portion that is continuously inclined greatly upward from the lower inclined portion. . For example, in FIG. 12, the outer main body rib D1 formed in the outer main body side part 41 has the downward inclination part D1-1 and the upward inclination part D1-2. Further, the outer main body rib D7 formed on the outer main body side portion 44 includes a lower inclined portion D7-1 and an upper inclined portion D7-2.

  The distal end portion of the downwardly inclined portion of each of the large number of outer body ribs D1 to D8 has a curved cross-sectional shape. In the present embodiment, the thickness of each rib of the large number of outer body ribs D <b> 1 to D <b> 8 is set to a dimension equal to or smaller than the thickness of the outer body bottom portion 40.

  In FIG. 10, four gas injection portions 45 to 48 are formed on the upper surface of the outer main body bottom portion 40 in a state of being close to the four corners of the outer main body bottom portion 40. Four extending portions 49 to 52 are formed on the upper surface of the outer body bottom 40 in a state of extending from the four gas injection portions 45 to 48 toward the four corners of the outer body bottom 40. The four gas injection portions 45 to 48 include injection ports that open upward. For example, in FIG. 11, the gas injection unit 47 includes an injection port 47A that opens upward, and the gas injection unit 48 includes an injection port 48A that opens upward.

  In this embodiment, the synthetic resin material melted to mold the outer body portion 5 is filled in the mold, and after the filling is completed, an inert gas such as nitrogen gas is supplied from the inlet of each gas injection portion. Injected. By this inert gas injection, cavities are formed extending from the gas injection portions to the peripheral regions CA21 to CA24 inside the outer main body bottom portion 40 and the outer main body side portions. For example, as shown in FIG. 11, the cavity 53 in the peripheral area CA23 is formed in the outer body bottom 10 so as to extend rightward from the injection port 47A. Further, the cavity 53 extends upward from the injection port 47 </ b> A through the inside of the outer main body side portion 43 in the direction guided by the extending portion 51, and is formed to a position close to the upper end portion of the outer main body side portion 43. Further, a cavity 54 in the peripheral area CA24 is formed in the outer main body bottom 10 so as to extend leftward from the injection port 48A. Further, the cavity 54 extends upward from the injection port 48 </ b> A through the inside of the outer body side part 42 in the direction guided by the extending part 52, and is formed to a position near the upper end part of the outer body side part 42. Cavities similar to the cavities 53 and 54 are also formed in the peripheral regions CA21 and CA22 of the other dregs injection portions 45 and 46.

  The upper end portions of the four outer body side portions 41 to 44 are formed in a tapered shape that becomes narrower upward, and are formed between the four bent portions 15 to 18 and the four connecting bent portions 19 to 22. It can be fitted to 19A to 22A. Four locking projections 55 to 58 are formed to protrude from the outer surfaces of the four outer body side portions 41 to 44. When the upper end portions of the outer body side portions 41 to 44 are fitted into the gaps 19A to 22A, the lower end portions of the connecting bent portions 19 to 22 are locked by the locking protrusions 55 to 58.

(Detailed configuration of the first metal plate 8)
The detailed configuration of the first metal plate 8 will be described with reference to FIG. FIG. 13 is a top view of the first metal plate 8 as viewed from above. The first metal plate 8 is formed by pressing a metal flat plate having a radiation preventing effect into a box shape by press working. As the metal material of the first metal plate 8, an aluminum plate, a copper plate, a stainless steel plate, or the like can be used. In the present embodiment, the first metal plate 8 is formed from an aluminum plate having a plate thickness of 0.3 mm. The length of the first metal plate 8 in the left-right direction is set to 152.2 mm, the width in the front-rear direction is set to 103.2 mm, and the height in the vertical direction is set to 34.6 mm.

  The first metal plate 8 includes a bottom plate portion 60 and four side plate portions 61 to 64. The four side plate portions 61 to 64 rise from the bottom plate portion 60 and are formed respectively. Four notches 65 to 68 are formed at the four corners of the bottom plate 60. Each notch portion of the four notch portions 65 to 68 includes a portion in which the corner portions of the two side plate portions adjacent to the respective corner portions of the four corner portions of the bottom plate portion 60 are notched. For example, the cutout portion 65 includes a portion that cuts out the lower left corner portion of the side plate portion 61 and a portion that cuts out the front lower corner portion of the side plate portion 63. The four notches 65 to 68 have similar shapes, and each notch is formed in a shape that does not interfere with each gas injection part of the inner body part 4 and each gas injection part of the outer body part 5. For example, the notch portion 65 is formed in a shape that does not interfere with the gas injection portion 23 of the inner main body portion 4 and the gas injection portion 45 of the outer main body portion 5.

  The first metal plate 8 is disposed in the first space S <b> 1 formed by the inner main body 4 and the outer main body 5. For this reason, about the 1st metal plate 8, the height of an up-down direction, the width | variety of the front-back direction, and the length of the left-right direction are set so that it may match the dimension of 1st space S1.

(Detailed configuration of the lid 3)
The inner lid portion 6 of the lid portion 3 is molded from a synthetic resin material. Further, the outer lid portion 7 of the lid portion 3 is also molded from a synthetic resin material. As the synthetic resin material for the inner lid portion 6 and the outer lid portion 7, a synthetic resin material is used that ensures safety for food storage and is not easily damaged when the heat retaining container 1 is dropped. In the present embodiment, polypropylene or polyethylene is used as the synthetic resin material for the inner lid portion 6 and the outer lid portion 7. In the present embodiment, the length of the lid 3 in the left-right direction is set to 167.3 mm, the width in the front-rear direction is set to 118.0 mm, and the height in the vertical direction is set to 16.0 mm.

(Detailed configuration of the inner lid portion 6)
A detailed configuration of the inner lid portion 6 will be described with reference to FIGS. 14 to 17. FIG. 14 is a front view showing the entire appearance of the inner lid body portion 6, and FIG. 15 is a top view of the inner lid body portion 6 as viewed from above. 16 is a longitudinal sectional view taken along line L8-L8 shown in FIG. 15, and FIG. 17 is a transverse sectional view taken along line L9-L9 shown in FIG. The inner lid body portion 6 includes an inner lid base portion 70, four inner lid upper portions 71 to 74, and four inner lid lower portions 75 to 78. The four inner lid upper portions 71 to 74 are formed by rising upward from the inner lid base 70, respectively. The four inner lid lower portions 75 to 78 are respectively formed by hanging downward from the inner lid base 70. The inner lid base 70 has stepped portions 70A to 70D whose upper surfaces are slightly higher in the peripheral area close to the four inner lid upper portions 71 to 74. The lower surfaces of the stepped portions 70A to 70D are also slightly higher upward and form a recess in a state of opening downward. As shown in FIGS. 1 and 2, the inner lid base portion 70 of the inner lid body portion 6 covers the accommodation space CP defined by the inner main body bottom portion 10 and the four inner main body side portions 11 to 14 from above. . In the present embodiment, the thickness of the inner lid base portion 70 and the thickness of each inner lid lower portion excluding the lower ends of the four inner lid lower portions 75 to 78 are set to substantially the same dimensions. The The four inner lid upper portions 71 to 74 have a thickness slightly smaller than the thickness of the inner lid base 70 and are formed in a tapered shape that becomes thinner upward.

  In FIG. 15, a large number of inner lid protrusions E <b> 1 to E <b> 17 are formed protruding upward from the upper surface of the inner lid base 70. The three inner lid protrusions E1 to E3 are arranged on the upper surface of the stepped portion 70A close to the inner lid upper part 71, and each of the inner lid protrusions E1 to E3 and the inner lid upper part 71 The distance in the front-rear direction is set smaller than the interval between two adjacent protrusions of the inner lid protrusions E1 to E3. Similarly, the three inner lid protrusions E15 to E17 are also arranged on the upper surface of the stepped portion 70D close to the inner lid upper portion 74, and the respective protrusions of the inner lid protrusions E15 to E17 and the inner lid upper portion are arranged. The distance in the front-rear direction between the portions 74 is set to be smaller than the interval between two adjacent protrusions of the inner lid protrusions E15 to E17. The two inner lid protrusions E7 and E14 are arranged in a stepped portion 70B adjacent to the inner lid upper part 72, and each of the inner lid protrusions E7 and E14 and the inner lid upper part 72 The distance in the left-right direction is set smaller than the distance between each protrusion of the inner lid protrusions E7 and E14 and the adjacent protrusion. For example, the distance in the left-right direction between the inner lid protrusion E7 and the inner lid upper portion 72 is set to be smaller than the interval between the inner lid protrusion E7 and the adjacent inner lid protrusion E10. Is done. Similarly, the two inner lid protrusions E4 and E11 are arranged in a stepped portion 70C close to the inner lid upper part 73, and each of the inner lid protrusions E4 and E11 and the inner lid upper part 73 are disposed. The distance in the left-right direction is set smaller than the distance between each protrusion of the inner lid protrusions E4 and E11 and the adjacent protrusion. For example, the distance in the left-right direction between the inner lid protrusion E4 and the inner lid upper portion 72 is set to be smaller than the interval between the inner lid protrusion E4 and the adjacent inner lid protrusion E8. Is done.

  Each protrusion of the large number of inner lid protrusions E1 to E17 has a circular cross-sectional shape. The tip of each protrusion is formed in a curved shape such as a hemispherical shape. In the present embodiment, the diameter of the circular cross section of each protrusion is set to be approximately the same as the thickness of the inner lid base 70 or smaller than the thickness of the inner lid base 70, for example, Set to 1.5 mm.

  In FIG. 15, four gas injection portions 79 to 82 are formed on the upper surface of the inner lid base portion 70 in a state of being close to the four corners of the inner lid base portion 70. Four extending portions 83 to 86 are formed on the upper surface of the inner lid base portion 70 in a state of extending from the four gas injection portions 79 to 82 toward the four corners of the inner lid base portion 70. The four gas injection portions 79 to 82 have injection ports that open upward. For example, in FIG. 16, the gas injection unit 81 includes an injection port 81A that opens upward, and the gas injection unit 82 includes an injection port 82A that opens upward.

  In this embodiment, the synthetic resin material melted to mold the inner lid portion 6 is filled in the mold, and after the filling is completed, an inert gas such as nitrogen gas is injected into each gas injection portion. Injected from. By injecting the inert gas, the cavity is formed inside the inner lid base 70, inside the four inner lid upper portions 71 to 74, and inside the four inner lid lower portions 75 to 78. It is formed extending from each gas injection part to the peripheral areas CA31 to CA34. For example, as shown in FIG. 16, a cavity 87 in the peripheral region CA33 is formed in the inner lid base 70 so as to extend rightward from the injection port 81A. Further, the cavity 87 extends upward in the inner lid upper portion 73 in the direction guided by the extending portion 85 from the injection port 81A, and is formed to a position close to the upper end portion of the inner lid upper portion 73. At the same time, the inside of the inner lid lower portion 77 extends downward and is formed to a position close to the lower end of the inner lid lower portion 77. Similarly, a cavity 88 in the peripheral area CA34 is formed in the inner lid base portion 70 so as to extend leftward from the inlet 82A. In addition, the cavity 88 extends upward from the inlet 82A in the direction guided by the extending portion 86 and extends to the position close to the upper end of the inner lid upper portion 72. At the same time, it extends downward in the inner lid lower part 76 and is formed to a position close to the lower end of the inner lid lower part 76. Cavities similar to the cavities 87 and 88 are also formed in the peripheral regions CA31 and CA32 of the other dregs injection portions 79 and 80.

(Detailed configuration of the outer lid portion 7)
A detailed configuration of the outer lid portion 7 will be described with reference to FIGS. FIG. 18 is a front view showing the entire appearance of the outer lid portion 7, and FIG. 19 is a bottom view of the outer lid portion 6 as viewed from below. 20 is a longitudinal sectional view taken along line L10-L10 shown in FIG. 19, and FIG. 21 is a transverse sectional view taken along line L11-L11 shown in FIG. The outer lid body portion 7 includes an outer lid body base portion 90 and four outer lid body side portions 91 to 94. The four outer lid side portions 91 to 94 are formed to hang downward from the outer lid base portion 90. Four connecting bent portions 95 to 98 are formed by being bent downward from the upper end portions of the four outer lid body side portions 91 to 94. In the present embodiment, the thickness of the outer lid base 90, the thickness of the outer lid sides of the four outer lid sides 91 to 94, and the thickness of the connected bent portions of the four connected bent portions 95 to 98 are as follows. The thickness is set to approximately the same dimension.

  The four connecting bent portions 95 to 98 are arranged such that gaps 95A to 98A are formed between the four outer lid side portions 91 to 94. The four inner lid upper portions 71 to 74 of the inner lid portion 8 are formed so as to be able to fit into the gaps 95A to 98A.

  In FIG. 19, a large number of outer lid protrusions F <b> 1 to F <b> 16 are formed protruding downward from the lower surface of the outer lid base 90. The three outer lid protrusions F1 to F3 are arranged in the vicinity of the outer lid side portion 91, and the distance in the front-rear direction between the respective projections of the outer lid projections F1 to F3 and the outer lid side portion 91. Is set smaller than the interval between two adjacent protrusions of the outer lid protrusions F1 to F3. Similarly, the three outer lid protrusions F14 to F16 are also arranged in the vicinity of the outer lid side portion 94, and the front and rear between each projection of the outer lid projections F14 to F16 and the outer lid side portion 94. The distance in the direction is set to be smaller than the interval between two adjacent protrusions of the outer lid protrusions F14 to F16. Further, the two outer lid protrusions F7 and F13 are disposed in the vicinity of the outer lid side portion 92, and the left and right directions between the respective projections of the outer lid projections F7 and F13 and the outer lid side portion 92 are provided. Is set to be smaller than the interval between each protrusion of the outer lid protrusions F7 and F13 and the adjacent outer lid protrusion. For example, the distance in the left-right direction between the outer lid protrusion F7 and the outer lid side 92 is set to be smaller than the distance between the outer lid protrusion F7 and the adjacent outer lid protrusion F9. The Similarly, the two outer lid protrusions F4 and F10 are disposed in the vicinity of the outer lid side portion 93, and the left and right sides between the respective projections of the outer lid projections F4 and F10 and the outer lid side portion 93. The distance in the direction is set to be smaller than the distance between each protrusion of the outer body protrusions F4 and F10 and the adjacent outer lid protrusion. For example, the distance in the left-right direction between the outer lid projection F4 and the outer lid side portion 93 is set to be smaller than the interval between the outer lid projection F4 and the adjacent outer lid projection F8. The

  Each protrusion of the large number of outer lid protrusions F1 to F16 has a circular cross-sectional shape. The tip of each protrusion is formed in a curved shape such as a hemispherical shape. In the present embodiment, the diameter of the circular cross section of each protrusion is substantially the same as the thickness of the central portion of the outer lid base 90 shown in FIG. 21 or the thickness of the central portion of the outer lid base 10. The diameter is set smaller than the thickness, for example, 1.5 mm.

  In FIG. 19, four gas injection portions 99 to 102 are formed on the lower surface of the outer lid base 90 in a state of being close to the four corners of the outer lid base 90. Four extending portions 103 to 106 are formed on the lower surface of the outer lid base 90 in a state of extending from the four gas injection portions 99 to 102 toward the four corners of the outer lid base 90. The four gas injection units 99 to 102 include injection ports that open downward. For example, in FIG. 20, the gas injection unit 99 includes an injection port 99A that opens downward, and the gas injection unit 100 includes an injection port 100A that opens downward.

  In this embodiment, a synthetic resin material melted to mold the outer lid body portion 7 is filled in a mold, and after the filling is completed, an inert gas such as nitrogen gas is injected into each gas injection portion. Injected from. Due to the injection of the inert gas, cavities are formed in the inside of the outer lid base portion 90 and the insides of the four outer lid side portions 91 to 94 so as to extend from the respective gas injection portions to the peripheral areas CA41 to CA44. . For example, as shown in FIG. 20, the cavity 107 in the peripheral area CA41 is formed in the outer lid base 90 so as to extend rightward from the injection port 99A. Further, the cavity 107 extends downward from the inlet 99A in the direction guided by the extending portion 103 through the inside of the outer lid side portion 93 and the inside of the connecting bent portion 97, and the lower end portion of the outer lid side portion 93. Is formed up to a position close to the lower end of the connecting bent portion 97. Similarly, a cavity 108 in the peripheral area CA42 is formed in the outer lid base 90 by extending leftward from the injection port 100A. The cavity 108 extends downward from the inlet 100 </ b> A through the inside of the outer lid side portion 104 and the inside of the connecting bent portion 96 in the direction guided by the extending portion 104, and the lower end portion of the outer lid side portion 104. And a position close to the lower end portion of the connecting bent portion 96. Cavities similar to the cavities 107 and 108 are also formed in the peripheral regions CA43 and CA44 of the other cusp injection portions 101 and 102.

(Detailed configuration of the second metal plate 9)
The detailed configuration of the second metal plate 9 will be described with reference to FIG. FIG. 22 is a top view of the second metal plate 8 as viewed from above. The second metal plate 9 has a flat plate shape, and is configured by forming a metal flat plate having a radiation preventing effect by pressing. As with the first metal plate 8, an aluminum plate, a copper plate, a stainless steel plate, or the like can be used as the metal material of the second metal plate 9. In the present embodiment, the second metal plate 9 is formed from an aluminum plate having a plate thickness of 0.3 mm. The length of the second metal plate 9 in the left-right direction is set to 154.0 mm, and the width in the front-rear direction is set to 104.6 mm.

  Four notches 110 to 113 are formed at the four corners of the second metal plate 9. The four notches 110 to 113 have the same shape, and each notch is formed in a shape that does not interfere with each gas injection part of the inner lid part 6 and each gas injection part of the outer lid part 7. For example, the notch 110 is formed in a shape that does not interfere with the gas injection part 79 of the inner lid part 6 and the gas injection part 99 of the outer lid part 7.

  The second metal plate 9 is disposed in the second space S <b> 2 formed by the inner lid body portion 6 and the outer lid body portion 7. For this reason, about the 2nd metal plate 9, the width | variety of the front-back direction and the length of the left-right direction are set so that it may match the dimension of 2nd space S2.

[Operation and Action of Embodiment]
(Method of forming container body 2 and lid 3)
A method for forming the inner body part 4 and the outer body part 5 of the container body part 2 and the inner lid part 6 and the outer lid part 7 of the lid body part 3 will be briefly described. Generally, the injection molding method includes a melting step for melting a synthetic resin material, an injection step for injecting the molten synthetic resin material into a mold, and filling the cavity space of the mold with the synthetic resin material injected by the injection step. A filling step, a pressure holding step for applying a predetermined holding pressure after the filling step is completed, and a cooling step for cooling the mold. After the cooling step is completed, the mold is opened and the molded product is taken out. The inner body part 4, the outer body part 5, the inner lid part 6, and the outer lid part 7 are molded articles.

  The amount of the synthetic resin material necessary for molding each molded article is determined according to a value obtained by subtracting the volume of the cavity formed inside each molded article from the volume of each molded article. In the present embodiment, the molten synthetic resin material is simultaneously injected into the mold from four gas injection portions formed in each molded product.

  A general injection molding method includes a pressure holding step, but the molding method according to the present embodiment includes a gas injection step of injecting an inert gas from each gas injection unit instead of the pressure holding step. The gas injection step in the present embodiment is the same process as the inert gas injection step in the gas assist molding method. Since the gas assist molding method is known from Japanese Patent Publication No. 48-41264, Japanese Patent Publication No. 3-47171, etc., its detailed description is omitted. The inert gas injection pressure and the injection time are determined according to the volume of the cavity formed inside each molded article.

(Assembly method of heat insulation container 1)
First, a method for assembling the heat retaining container 1 according to the present embodiment will be described with reference to FIGS. As described above, the inner main body 4 and the outer main body 5 of the container main body 2 are prepared by molding with a synthetic resin material. Further, as described above, the inner lid portion 6 and the outer lid portion 7 of the lid portion 3 are also prepared by being molded from a synthetic resin material. The first metal plate 8 and the second metal plate 9 are prepared by being pressed.

  In order to assemble the container body 2, the first metal plate 8 is disposed inside the outer body 5. In this case, the bottom plate portion 60 of the first metal plate 8 is horizontally held at a distance from the upper surface of the outer body bottom portion 40 of the outer body portion 5 by the multiple outer body protrusions C1 to C16 of the outer body portion 5. The The four side plate portions 61 to 64 of the first metal plate 8 are in contact with the downward inclined portions of the many outer body ribs D1 to D8 of the outer body portion 5 from the side surfaces of the four outer body side portions 41 to 44. Hold vertically at intervals.

  The outer main body 4 holds the first metal plate 8 by fitting the upper ends of the four outer main body side portions 41 to 44 of the outer main body portion 5 into the gaps 19A to 22A of the inner main body portion 4. It is assembled to part 5. In this case, the bottom plate portion 60 of the first metal plate 8 is held at a distance from the lower surface of the inner main body bottom portion 10 of the inner main body portion 4 by the numerous inner main body protrusions A1 to A16 of the inner main body portion 4. The upper end portions of the four side plate portions 61 to 64 of the first metal plate 8 are formed by the four inner body side portions 11 to 14 and the four inner body side portions 11 to 14 of the inner body portion 4 by the numerous inner body ribs B1 to B20 of the inner body portion 4. It is held at an interval from the two surfaces facing the bent portions 15 to 18. The upper end portions of the four side plate portions 61 to 64 are sandwiched and held between two adjacent ribs among the numerous inner body ribs B1 to B20. For example, as shown in FIG. 1, the upper end portion of the side plate portion 62 is sandwiched and held between two adjacent inner body ribs B8 and B9.

  23 is an enlarged view of the region R1 shown in FIG. 1, FIG. 24 is an enlarged view of the region R2 shown in FIG. 1, and FIG. 25 is an enlarged view of the region R3 shown in FIG. In FIG. 23, the inner main body protrusion A11 of the inner main body bottom 10 and the outer main body protrusion C13 of the outer main body bottom 40 are arranged at positions close to each other, and the bottom plate portion 60 of the first metal plate 8 includes two pieces. It is sandwiched and held in the vertical direction by the protrusions A11 and C13 arranged close to each other. In the present embodiment, the vertical height HA of the protrusion A11 and the vertical height HC of the protrusion C13 are substantially the same height, and the first height S1 from the vertical height SH1 of the first space S1. This corresponds to half of the value obtained by subtracting the thickness of 0.3 mm for one metal plate 8. In FIG. 25, the inner body ribs B17 and B18 of the inner body part 4 are arranged so as to face each other, and the upper end part of the side plate part 62 of the first metal plate 8 is sandwiched between the two facing ribs B17 and B18 in the left-right direction. Held. The gap G1 between the two facing inner body ribs is set to a gap larger than the plate thickness of the first metal plate 8 of 0.3 mm. In the present embodiment, the gap G1 is set to 0.55 mm. The vertical height SH1 of the first space S1 is set to 6.0 mm.

  After the upper end portions of the four outer body side portions 41 to 44 of the outer body portion 5 are fitted in the gaps 19A to 22A of the inner body portion 4, the upper end portions of the four outer body side portions 41 to 44 are at atmospheric pressure. In the manufacturing process, the four bent portions 15 to 18 and the four connected bent portions 19 to 22 of the inner body portion 4 are welded by ultrasonic waves. Thereby, the container main-body part 2 is assembled. FIG. 26 shows an arrangement relationship between the inner metal body projections A1 to A16 and the outer body projections C1 to C16 and the first metal plate 8 in the assembled container body 2. In FIG. 26, each gas injection part and each extension part of the inner body part 4 and each gas injection part and each extension part of the outer body part 5 are four cutout parts 65 to 68 of the first metal plate 8. It is arrange | positioned inside each notch part. For example, the gas injection parts 23 and 45 and the extension parts 27 and 49 are disposed inside the notch part 65 and do not interfere with the first metal plate 8. Further, in order to prevent the four corner regions of the bottom plate portion 60 of the first metal plate 8, that is, the peripheral regions of the four notches 65 to 68 from being bent in the vertical direction, the inner main body protrusion and the outer main body protrusion. The parts are arranged at relatively narrow intervals. For example, in the peripheral region of the notch 65, the inner main body protrusions A1 and A4 and the outer main body protrusions C1 and C5 are arranged at a relatively narrow interval.

  In order to assemble the lid 3, the second metal plate 9 is disposed inside the inner lid 6. In this case, the second metal plate 9 is horizontally held at a distance from the upper surface of the inner lid base 70 of the inner lid 6 by the numerous inner lid protrusions E1 to E17 of the inner lid 6. The

  The upper end portions of the four inner lid upper portions 71 to 74 of the inner lid portion 6 are fitted into the gaps 95A to 98A of the outer lid portion 7, so that the outer lid portion 7 attaches the second metal plate 9. The inner lid body portion 6 to be held is assembled. In this case, the second metal plate 9 is held at a distance from the lower surface of the outer lid base portion 90 of the outer lid portion 7 by the numerous outer lid protrusions F <b> 1 to F <b> 16 of the outer lid portion 7.

  In FIG. 24, the inner lid protrusion E15 of the inner lid base 70 and the outer lid protrusion F14 of the outer lid base 90 are arranged at positions close to each other, and the second metal plate 9 includes two pieces. It is sandwiched and held in the vertical direction by the protrusions E15 and F14 arranged close to each other. In the present embodiment, the vertical height HE of the protrusion E15 from the inner lid base 70 and the vertical height HF of the protrusion F15 are substantially the same, and the vertical height of the second space S2 This corresponds to half the value obtained by subtracting the thickness 0.3 mm of the second metal plate 9 from the height SH2 in the direction. The peripheral edge portion of the second metal plate 9 is arranged at a distance from each outer lid side portion of the outer lid side portions 91 to 94 of the outer lid portion 7. For example, in FIG. 25, the rear edge portion of the second metal plate 9 is disposed with a gap G2 from the outer lid side portion 94. In the present embodiment, the gap G2 is set to 0.29 mm. The vertical height SH2 of the second space S2 is set to 6.0 mm.

  After the upper end portions of the four inner lid upper portions 71 to 74 of the inner lid portion 6 are fitted in the gaps 95A to 98A of the outer lid portion 7, the upper ends of the four inner lid upper portions 71 to 74 are In the manufacturing process at atmospheric pressure, the four outer lid side portions 91 to 94 and the four connecting bent portions 95 to 98 of the outer lid portion 7 are welded by ultrasonic waves. Thereby, the cover part 3 is assembled. FIG. 27 shows the positional relationship between the inner lid protrusions E1 to E17 and the outer lid protrusions F1 to F16 and the second metal plate 9 in the assembled lid part 3. In FIG. 27, each gas injection part and each extension part of the inner lid part 6 and each gas injection part and each extension part of the outer lid part 7 are four cutout parts 110 of the second metal plate 9. It arrange | positions inside each notch part of -113. For example, the gas injection parts 79 and 99 and the extension parts 83 and 103 are arranged inside the notch part 110 and do not interfere with the second metal plate 9. Further, in order to prevent the regions of the four corners of the second metal plate 9, that is, the peripheral regions of the four notches 110 to 113 from being bent in the vertical direction, the inner lid protrusion and the outer lid protrusion are They are arranged at relatively narrow intervals. For example, in the peripheral region of the notch 110, the inner lid protrusions E1 and E4 and the outer lid protrusions F1 and F4 are arranged at a relatively narrow interval.

(Insulation action of the insulation container 1)
Next, the heat retaining action of the heat retaining container 1 will be described with reference to FIG. FIG. 28 shows the relationship between the temperature of the contents stored in the heat retaining container and the elapsed time. In FIG. 28, the vertical axis represents the temperature of the contents (° C.), and the horizontal axis represents the elapsed time (hours). ).

  The example has the same structure as the heat insulating container 1 of the present embodiment, and has a structure in which an aluminum plate having a plate thickness of 0.3 mm is held inside the container main body portion and the lid body portion by protrusions and ribs. It is. Comparative Example 1 is a heat retaining container having a structure in which an aluminum plate having a thickness of 0.3 mm is sandwiched from both sides by a hard foamed urethane material. Comparative Example 2 is a heat insulating container having a structure in which an aluminum plate having a thickness of 0.3 mm is sandwiched from both sides by a polystyrene foam material. The length in the left-right direction, the width in the front-rear direction, and the height in the up-down direction of each of the heat insulation containers of Examples and Comparative Examples 1 and 2 are set to be substantially the same, and the wall thickness of each heat insulation container is also substantially the same. Is set.

  As a measurement condition, the contents stored in each heat insulation container are a certain amount of hot water heated to 92 ° C. The room temperature where each heat insulating container is placed is set within a range of 26 ° C to 27 ° C. The temperature of the contents is measured with a thermocouple.

  As a measurement result, the temperature of the contents accommodated in each heat insulating container decreases as shown in FIG. The temperature of the contents after 5 hours from the start of measurement is 37.3 ° C. in the examples, and 36.5 ° C. in both comparative examples 1 and 2. As a result, it was confirmed that the example had a heat retention effect equivalent to or higher than that of Comparative Examples 1 and 2.

[Effect of the embodiment]
In this embodiment, the 1st metal plate 8 is the top and bottom, right and left, front and back by many protrusions A1-A16, C1-C16, and many ribs B1-B20, D1-D8 inside the container main-body part 2. FIG. Is held from both sides. Moreover, the 2nd metal plate 9 is hold | maintained from the up-and-down both sides by many protrusion part E1-E17, F1-F16 in the inside of the cover body part 3. FIG. As a result, the container main body portion and the lid body portion have a simple structure that is integrally formed with the protrusions and the ribs. And the 1st metal plate 8 and the 2nd metal plate 9 reflect the radiation from the content accommodated in the accommodation space CP of the heat retention container 1, and exhibit a heat retention effect | action. As shown in FIG. 28 as an example, the heat retaining container 1 of the present embodiment exhibits a heat retaining action equivalent to or higher than that of Comparative Examples 1 and 2.

  In the present embodiment, as shown in FIG. 8, the cavity 31 is formed to extend from the gas injection portions 23 to 26 to the bent portions 15 to 18 beyond the upper ends of the inner main body side portions 11 to 14. As shown in FIG. 11, the cavities 53 and 54 are formed to extend from the gas injection portions 45 to 48 to the upper end portions of the outer body side portions 41 to 44. As shown in FIG. 16, the cavities 87 and 88 are formed to extend from the gas injection portions 79 to 82 to the upper ends of the inner lid upper portions 71 to 74 and the lower ends of the inner lid lower portions 75 to 78. Is done. As shown in FIG. 20, the cavities 107 and 108 are formed to extend from the gas injection portions 99 to 102 to the lower end portions of the outer lid side portions 91 to 94 and the lower end portions of the connecting bent portions 95 to 98. As a result, the cavities formed in the respective portions are regions where the first metal plate 8 and the second metal plate 9 are not disposed, and regions where the notches 65 to 68 and 110 to 113 of both the metal plates 8 and 9 are present. Through this, it is possible to reduce the emission of radiation from the contents.

  Usually, the gas injection part is preferably arranged at a position close to a region where the first metal plate 8 and the second metal plate 9 are not arranged. For example, the upper end portions of the inner main body side portions 11 to 14 of the inner main body portion 4 and the upper end portions of the bent portions 15 to 18 are part of the region where the side plate portions 61 to 64 of the first metal plate 8 are not disposed. It is considered that the gas injection parts 25 to 28 are preferably arranged close to the upper end parts of the inner main body side parts 11 to 14 and the upper end parts of the bent parts 15 to 18. However, when the gas injection parts 25 to 28 are arranged close to the upper ends of the inner body side parts 11 to 14 and the upper ends of the bent parts 15 to 18, the gas injection parts 25 to 28 are the first metal plate. It is necessary to form a relatively large cutout portion so as not to interfere with the side plate portions 61 to 64 of the eighth plate, and the radiation preventing action of the first metal plate 8 may be impaired. Therefore, in the present embodiment, the gas injection parts 25 to 28 are arranged at positions close to the corners of the inner body bottom part 10 close to the inner body side parts 11 to 14. As a result, a cavity can be formed in a region where the first metal plate 8 is not disposed without impairing the radiation preventing action of the first metal plate 8. Further, the gas injection parts 45 to 48 are arranged at positions near the corners of the outer main body bottom 40 of the outer main body part 5, so that the radiation preventing action of the first metal plate 8 is not impaired, and the outer main body side part is reduced. A cavity can be formed at a position close to the upper end portions of 41 to 44.

  In this embodiment, the 1st metal plate 8 is the upper and lower sides, right and left, front and back by many protrusions A1-A16, C1-C16, and many ribs B1-B20, D1-D8 in the container main-body part 2. FIG. Hold from both sides. Moreover, the 2nd metal plate 9 is hold | maintained from the up-and-down both sides by many protrusion E1-E17, F1-F16 in the inside of the cover part 3. FIG. As a result, even if the posture of the heat retaining container 1 changes drastically due to cleaning or the like, the first metal plate 8 and the second metal plate 9 are surely kept in a constant state inside the container body 2 and the lid 3. Retained.

  In the present embodiment, the distance between the inner main body protrusions and the inner main body side parts that are arranged close to the inner main body side parts 11 to 14 among the many inner main body protrusions A1 to A16 of the inner main body bottom 10. Is set to be smaller than the distance between each of the inner main body protrusions arranged close to each other and the adjacent inner main body protrusion. For example, the distance in the front-rear direction between the inner body protrusion A1 or the inner body protrusion A2 and the inner body side part 11 is the distance between the inner body protrusion A1 and the adjacent inner body protrusion A4, Alternatively, the distance is set to be smaller than the distance between the inner main body protrusion A2 and the adjacent inner main body protrusion A5. The distance between the outer body protrusions and the outer body side parts arranged in the vicinity of the outer body side parts 41 to 44 among the many outer body protrusions C1 to C16 of the outer body bottom part 40 is as follows. The distance is set to be smaller than the distance between each outer body protrusion that is disposed close to the protrusion and the outer body protrusion adjacent to the protrusion. For example, the distance in the front-rear direction between the outer body protrusion C1 or the outer body protrusion C2 and the outer body side part 41 is the distance between the outer body protrusion C1 and the adjacent outer body protrusion C3, Alternatively, the distance is set smaller than the distance between the outer main body protrusion C2 and the adjacent outer main body protrusion C4. As a result, the peripheral edge portion of the bottom plate portion 60 of the first metal plate 8 can be reduced from being curved toward the inner main body bottom portion 10 or the outer main body bottom portion 40. By reducing the curvature of the peripheral edge portion of the bottom plate portion 60 of the first metal plate 8, the radiation preventing effect of the bottom plate portion 60 of the first metal plate 8 can be maintained constant.

  In the present embodiment, among the many inner lid protrusions E1 to E17 of the inner lid base portion 70, the inner lid protrusion and the inner lid upper portion that are disposed in the vicinity of the inner lid upper portions 71 to 74. Is set to be smaller than the distance between the inner lid protrusions arranged close to each other and the inner lid protrusion adjacent to the protrusions. For example, the distance in the front-rear direction between the inner lid projection E1 or the inner lid projection E2 and the inner lid side portion 71 is the distance between the inner lid projection E1 and the adjacent inner lid projection E4. Or a distance between the inner lid protrusion E2 and the adjacent inner lid protrusion E5. The distance between the outer lid projecting portion and the outer lid body side portion that are arranged close to the inner lid side portions 91 to 94 among the many outer lid projecting portions F1 to F16 of the outer lid base portion 90. Is set to be smaller than the distance between the outer lid protrusions arranged close to each other and the outer lid protrusions adjacent to the protrusions. For example, the distance in the front-rear direction between the outer lid projection F1 or the outer lid projection F2 and the outer lid side 91 is such that the outer lid projection F1 and the adjacent outer lid projection F4 are adjacent to each other. Or a distance between the outer lid protrusion F2 and the adjacent outer lid protrusion F5. As a result, it can reduce that the peripheral part of the 2nd metal plate 9 curves toward the inner side main body base 70 or the outer side main body base 90. FIG. By reducing the curvature of the peripheral edge of the second metal plate 9, the radiation preventing effect of the second metal plate 9 can be kept constant.

  In this embodiment, as shown in FIG. 26, many protrusions A1-A16 and many protrusions C1-C16 are arrange | positioned in the mutually different position in the front-back direction and the left-right direction. Many ribs B1-B20 are arrange | positioned in a mutually different position in the front-back direction and the left-right direction, as shown in FIG. Many protrusions E1-E17 and many protrusions F1-F16 are arrange | positioned in a mutually different position in the front-back direction and the left-right direction. As a result, even when the first metal plate 8 and the second metal plate 9 expand and contract due to a temperature change, the first metal plate 8 and the second metal are between the two protrusions and between the two ribs. The expansion and contraction of the plate 9 is not hindered.

<Correspondence of configuration>
The heat insulating container 1 is an example of the heat insulating container of the present invention. The container main body 2, the inner main body 4, and the outer main body 5 are examples of the container main body, the inner main body, and the outer main body of the present invention. The lid body part 3, the inner lid body part 6, and the outer lid body part 7 are examples of the lid body part, the inner lid body part, and the outer lid body part of the present invention. The first space S1, the second space S2, and the accommodation space CP are examples of the first space, the second space, and the accommodation space of the present invention. The first metal plate 8 and the second metal plate 9 are examples of the first metal plate and the second metal plate of the present invention. The gas injection units 23 to 26, 45 to 48, 79 to 82, and 99 to 102 are examples of the injection unit, the main body injection unit, and the lid injection unit of the present invention. The extending parts 27 to 30, 49 to 52, 83 to 86, and 103 to 106 are examples of the extending part of the present invention. The cutout portions 65 to 68 of the first metal plate 8 are an example of the injection portion into which the main body injection portion of the present invention is fitted, and the cutout portions 110 to 113 of the second metal plate 9 are the lid injection portion of the present invention. It is an example of the injection | pouring part which fits. The cavities 31, 53, 54, 87, 88, 107, and 108 are examples of the cavities of the present invention.

<Modification>
The present invention is not limited to this embodiment, and various modifications can be made without departing from the spirit of the present invention. An example of the modification will be described below.

(1) In this embodiment, the heat insulation container 1 has a box shape such as a rectangular parallelepiped, but is not limited to this shape. For example, the heat insulating container may have a cylindrical shape or a polygonal cylindrical shape.

(2) In this embodiment, the 1st metal plate 8 is hold | maintained by many protrusion part A1-A16, C1-C16, and many rib B1-B20, D1-D8 inside the container main-body part 2. FIG. . In addition, the second metal plate 9 is held by a large number of protrusions E1 to E17 and F1 to F16 inside the lid portion 3. However, the configuration for holding each metal plate is not limited to the protrusions and the ribs. For example, the structure by which each metal plate is pinched | interposed and hold | maintained from heat insulation materials, such as hard foaming urethane material, may be sufficient.

(3) In this embodiment, each gas injection part of gas injection part 23-26, 45-48, 79-82, 99-102 is used in order to inject the molten synthetic resin material into a metal mold | die. At the same time, it is used to inject an inert gas into the mold, but is not limited to this configuration. For example, the structure in which the injection | pouring part into which the fuse | melted synthetic resin material is inject | poured into a metal mold | die may be provided separately from each gas injection | pouring part may be sufficient.

(4) In this embodiment, the cross-sectional shape of each of the protrusions A1 to A16, C1 to C16, E1 to E17, and F1 to F16 is a circular cross-sectional shape, but is not limited to this shape. . For example, the cross-sectional shape of each protrusion may be a cross-sectional shape such as an ellipse or a polygon. In the present embodiment, the diameters of the multiple protrusions are all the same, but the cross-sectional areas of the multiple protrusions may be different, such as the diameters of the multiple protrusions being different.

(5) In this embodiment, the 1st metal plate 8 is hold | maintained in the approximate center position of 1st space S1 of the container main-body part 2. FIG. The second metal plate 9 is held at a substantially central position of the second space S2 of the lid portion 3. However, the holding position of each metal plate is not limited to the center position of each space. In addition, the bottom plate portion 60 of the first metal plate 8 is held horizontally inside the first space S1, and the second metal plate 9 is held horizontally inside the second space S2. However, the holding posture of each metal plate is not limited to the horizontal posture. For example, the holding posture of each metal plate may be a curved posture.

(6) In the present embodiment, each of the protrusions A1 to A16, C1 to C16, E1 to E17, and F1 to F16 is connected to the bottom plate portion 60 of the first metal plate 8 or the second metal plate 9. In order to reduce the contact area, the diameter of each protrusion is set to 1.5 mm, and the tip of each protrusion is formed in a curved surface shape such as a hemisphere, but is not limited to this configuration. . It is preferable that the dimension in the left-right direction or the front-rear direction of the cross section of each protrusion is a dimension equal to or less than the height of the protrusion in the vertical direction. The curved surface shape of each protrusion may be a shape that does not hinder expansion and contraction of each metal plate according to a temperature change.

DESCRIPTION OF SYMBOLS 1 Thermal insulation container 2 Container main-body part 3 Lid body part 4 Inner main-body part 5 Outer main-body part 6 Inner lid-body part 7 Outer lid-body part 8 1st metal plate 9 2nd metal plate 23-26, 45-48, 79-82 99-102 Gas injection part 27-30, 49-52, 83-86, 103-106 Extension part 65-68, 110-113 Notch part 31, 53, 54, 87, 88, 107, 108 Cavity S1 1st 1 space S2 2nd space CP accommodation space A1-A16 inner side body protrusion B1-B20 inner side body rib C1-C16 outer side body protrusion D1-D8 outer side body rib E1-E17 inner side cover protrusion F1-F16 outer side cover protrusion Part

Claims (9)

A container body,
A lid that covers the container body,
A first metal plate provided in the container body and having a radiation preventing effect;
A second metal plate provided on the lid portion and having a radiation preventing effect,
In the direction from the housing space formed by the container main body and the lid body to the outside, there is a cavity in at least one location of the container main body or the lid body where neither the first metal plate nor the second metal plate is present. A heat insulating container in which is formed. The container main body includes an inner main body and an outer main body assembled to the inner main body in a state of forming a first space between the inner main body and
The lid body part includes an inner lid body part and an outer lid body part assembled to the inner lid body part in a state of forming a second space between the inner lid body part,
A first metal plate is disposed inside the first space;
A second metal plate is disposed inside the second space;
An inner main body portion, an outer main body portion, an inner lid body portion, or an outer side in which neither the first metal plate nor the second metal plate exists in the direction from the housing space formed by the container main body portion and the lid body portion to the outside. The heat insulating container according to claim 1, wherein a cavity is formed in at least one location of the lid portion. The inner body part includes an inner body bottom part, and an inner body side part extending up from the inner body bottom part,
The outer body part includes an outer body bottom part and an outer body side part extending up from the outer body bottom part,
The first metal plate is disposed in a bottom plate portion disposed in a space formed between the inner main body bottom portion and the outer main body bottom portion, and in a space formed between the inner main body side portion and the outer main body side portion. The heat insulating container according to claim 2, comprising a side plate portion.   The heat retaining member according to claim 3, further comprising an injection part that is formed at a position where the cavity is formed at the inner body part, the outer body part, the inner lid part, or the outer lid part, and into which gas is injected. container.   The heat insulating container according to claim 4, further comprising an extending part formed to be connected to the injection part in order to regulate a direction in which the gas injected from the injection part flows.   The plurality of main body injection parts are respectively formed on two opposing surfaces of the inner main body part and the outer main body part, and are arranged apart from each other in a direction in which the inner main body part and the outer main body part extend and extend. 5. A heat insulating container according to 5.   The plurality of lid injecting portions are respectively formed on two opposing surfaces of the inner lid portion and the outer lid portion, and are arranged apart from each other in a direction in which the inner lid portion and the outer lid portion expand and extend. The heat insulation container in any one of Claim 4 thru | or 6.   The heat insulating container according to claim 6, wherein the bottom plate portion of the first metal plate has a cutout portion into which each injection portion of the plurality of main body injection portions is fitted.   The heat retention container according to claim 7, wherein the second metal plate has a cutout portion into which each injection portion of the plurality of lid injection portions is fitted.

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