JP7706399B2 - Packaging Structure - Google Patents

Description

The present invention relates to a packaging structure, and more particularly to a packaging structure including a plurality of thermal insulation containers each including a container body having an opening at the top.

In logistics, goods are transported in cardboard boxes or similar packaging. When transporting cargo such as cardboard boxes, in order to increase work efficiency, multiple boxes are stacked on a pallet or similar to create a single packaging structure so that they can be moved together.

When stacking multiple boxes on a pallet in multiple layers, a method called "bar stacking" or "row stacking" may be used, in which the arrangement of the boxes in the first layer is the same as the arrangement in the second layer and beyond, so that the boxes are stacked in a single vertical row. In addition to these methods, other loading methods such as "brick stacking," "alternate row stacking," and "pinhole stacking," in which the arrangement of the boxes in odd and even layers is different, are also widely used.

In "brick stacking" and similar methods, the boxes in the next layer are placed on top of the boundary between two adjacent boxes in the same layer, so the boundaries between the boxes are not continuous in the vertical direction. On the other hand, in the "stick stacking" method, the boundaries are continuous in the vertical direction, so if the stack is made taller, the boxes above will shake significantly due to vibrations during transportation. For example, if two rectangular boxes with left and right dimensions of about 1.5 times their front and back dimensions are lined up lengthwise, the length will be about three times the width of the boxes, so if three boxes are lined up next to these two lined up so that they are oriented 90 degrees apart, five boxes will be arranged in a rectangle. If this arrangement is done on the first layer, and then from the second layer onwards, the positions of the two boxes and the three boxes are reversed compared to the lower layer, a collection that is resistant to shaking will be formed.

On the other hand, if the arrangement of the first row is the same as that of the second row and beyond, the final assembly will be formed into five separate rows, and since the boxes that make up each row will no longer have the restraining force to prevent the movement of the boxes in the adjacent rows, the assembly will be vulnerable to lateral swaying and the like. For this reason, when forming a packaging structure using "bar stacking," the boxes are secured in place with bands or stretch film. However, "bar stacking" has the advantage that the boxes can be moved row by row, making loading and unloading easier.

Insulated containers with a container body made of foamed resin are widely used in the distribution of food and other products. Known examples of this type of insulated container include a container body that has a bottom wall on which food is placed and a peripheral side wall that rises from the peripheral edge of the bottom wall and has an opening at the top defined by the upper end of the peripheral side wall, and a container that further includes a lid that fits into the container body to close the opening.

Insulated containers with such lids use foamed bead moldings for the container body and lid, and are strong and have excellent heat insulation. In some cases, lids are attached to individual container bodies and stacked vertically, but in other cases, lids are only attached to the topmost container body, and the container bodies below that are stacked on top of them are used instead of the lids for the lower container bodies to reduce the overall stacking height.

As shown in Patent Document 1 below, in such thermal containers, a groove is provided on the outer periphery of the lower surface of the container body, and a convex portion on the upper end of the peripheral wall of the lower thermal container or on the lid of the lower thermal container is inserted into the groove to prevent lateral sliding between the upper and lower containers.

JP 2005-206246 A

The above-mentioned thermal insulation containers and packaging structures made using the thermal insulation containers are required to be lightweight and compact due to factors such as the amount of material that can be loaded onto trucks and storage space. However, if the container body is used in place of the lid of the lower container body, the thermal insulation performance is likely to decrease, and this demand has not been fully met. Therefore, the object of the present invention is to provide a thermal insulation container and packaging structure that can be easily made compact while suppressing the decrease in thermal insulation performance.

To solve the above problems, the present invention provides:
The container has a container body with an opening at the top and a lid body that is fitted onto the container body to close the opening,
The container body is a bead foam molding,
The heat-retaining container has a lid body which is a sheet-molded body made of a resin foam sheet.

The present invention also provides a method for producing a method for manufacturing a semiconductor device comprising the steps of:
A packaging structure including a container assembly in which a plurality of thermal insulation containers are assembled together,
The heat-retaining container includes a container body having an opening at an upper portion, and a lid body fitted to the container body to close the opening,
The container body is a bead foam molding,
In the container assembly, a plurality of stages each including a plurality of the thermal insulation containers arranged in a front-rear and left-right direction are stacked in a plurality of stages, and the container bodies and the lids are alternately arranged from bottom to top,
The lid body fitted to at least a part of the container body arranged below the uppermost container body is a sheet molded body made of a resin foam sheet, and
A packaging structure is provided in which a thick lid made of a bead foam molded body having a thickness greater than that of the sheet molded body is fitted onto the uppermost container body.

According to the present invention, a thin lid body, which is a sheet molded body, is used instead of a thick lid body such as a bead foam molded body, and since the lid body is made of a resin foam sheet, it is possible to make the thermal insulation container and packaging structure more compact while suppressing the deterioration of the thermal insulation performance.

FIG. 1 is a perspective view showing the configuration of the packaging structure. FIG. 2 is a perspective view showing an insulated container according to one embodiment. FIG. 3A is a perspective view showing the container body of the first embodiment as viewed from above. FIG. FIG. 3B is a perspective view showing the container body of the first embodiment as viewed from below. FIG. 4A is a cross-sectional view showing a cross section of the container body of the first embodiment when cut along a vertical plane in the longitudinal direction. FIG. 4B is an enlarged view of the portion indicated by the dashed line B in FIG. 4A. FIG. 5 is a cross-sectional view (cross-sectional view taken along line VV in FIG. 2) showing the state of a cross section when the container body of the first embodiment is cut in the longitudinal direction along a vertical plane. FIG. 6 is a cross-sectional view showing the loading state of the upper thermal insulation containers in the container row. FIG. 7A is a perspective view showing the cover of the first embodiment as viewed from above. FIG. FIG. 7B is a perspective view showing the cover of the first embodiment as viewed from below. FIG. 7C is a perspective view showing the cover body having projections and recesses according to the first embodiment as viewed from above. FIG. 7D is a perspective view showing the cover body having projections and recesses according to the first embodiment as viewed from below. FIG. 8 is a cross-sectional view showing the thermal insulation container of the second embodiment. FIG. 9A is a cross-sectional view showing a state in which a container body is doubly sealed with a thermal insulation container of the second embodiment. FIG. 9B is an enlarged view of the portion indicated by the dashed line IX in FIG. 9A. FIG. 10A is a perspective view showing another example of a thick cover as viewed from above. FIG. 10B is a perspective view showing another example of a thick cover as viewed from below.

One embodiment of the thermal insulation container and packaging structure according to the present invention will be described below with reference to the drawings. As shown in FIG. 1, the packaging structure 100 has a container assembly 110 in which a plurality of thermal insulation containers 1 are gathered together. The packaging structure 100 of this embodiment has a pallet 120 as a mounting device for mounting the container assembly 110. The packaging structure 100 of this embodiment may have a basket cart instead of the pallet 120 as the mounting device.

The container assembly 110 of this embodiment has a plurality of container rows 111 in which the plurality of thermal insulation containers 1 are stacked in a row. The packaging structure 100 may have a sheet, board, net, belt, wrap film, etc. for bundling the container rows 111 to prevent the container assembly 110 from collapsing or for fixing the container assembly 110 to the mounting fixture.

In this embodiment, a container assembly 110 is illustrated that is composed of 48 thermal insulation containers 1 stacked vertically in eight tiers, each tier consisting of six thermal insulation containers 1 arranged front to back and left to right, but the thermal insulation containers 1 that make up one tier may be arranged in a line in the front to back or left to right direction, and the number of tiers stacked in the height direction may be seven or less, or nine or more. In the container assembly 110 of this embodiment, the thermal insulation containers 1 are stacked in rows, but the container assembly 110 may also be stacked in a different arrangement between even and odd tiers, such as in brickwork.

The thermal insulation container 1 of this embodiment has a rectangular parallelepiped shape. Therefore, the container row 111 of this embodiment is a rectangular column extending long in the vertical direction. The container assembly 110 is formed by assembling the rectangular column-shaped container rows 111 with their sides abutting against each other, and is a rectangular column that is thicker than each of the container rows 111.

The thermal insulation container 1 of this embodiment includes a container body 2 having an opening at the top, and a lid body 3 that is fitted to the container body 2 to close the opening 2a. The container body 2 of this embodiment is a bead foam molded body. The thermal insulation container 1x at the top of each container row 111 is configured in the same manner as a conventional thermal insulation container, and the lid body that is fitted to the container body 2x to close the opening 2a of the container body 2x is a bead foam molded body. In this conventional container (hereinafter also referred to as the "conventional container"), a thick lid 3x that is several times thicker than the lid body 3 in the thermal insulation container 1 of this embodiment is used as a lid to close the opening 2a of the container body 2x.

The second and subsequent thermal insulation containers 1 from the top have the lids 3 made of a sheet-formed body made of a resin foam sheet. In this embodiment, the lids of the topmost tier, which are likely to be subjected to force when a belt or net is hung, are made of thick lids 3x that are thicker and have higher bending rigidity than the sheet-formed bodies, making it easier to prevent the container assembly 110 from collapsing. In this embodiment, the topmost tier is a conventional container, but if necessary, the thermal insulation container in the topmost tier may also be provided with lids 3 that are sheet-formed bodies like the thermal insulation containers 1 from the second and subsequent tiers from the top.

In each row 111 of containers in this embodiment, the container bodies and lids are arranged alternately from bottom to top and are mounted on the pallet 120. That is, in the container assembly 110 of this embodiment, all of the thermal insulation containers 1, except for the thermal insulation container 1x arranged in the top row, which is similar to the conventional thermal insulation container 1x, are equipped with a lid 3 that is a sheet molded body.

A first embodiment of the thermal insulation container 1 according to the present invention will be described with reference to the drawings.
The thermal insulation container 1 of the present embodiment is formed in a box shape capable of storing products (e.g., fresh foods such as vegetables and seafood) as contents. The thermal insulation container 1 of the present embodiment is used for storing products together with ice such as crushed ice or a cooling agent such as dry ice.

In the following description, as shown in FIG. 2, the longitudinal direction X of the thermal container 1 is taken as the left-right direction, and the transverse direction Y of the thermal container is taken as the front-rear direction. Thus, the thermal container 1 of this embodiment has a horizontally elongated rectangular parallelepiped shape that is long in the left-right direction and short in the front-rear direction. In addition, the thermal container 1 will be described in detail below with the height direction of the thermal container 1 taken as the up-down direction Z. In this embodiment, the dimension Lx (length) in the longitudinal direction X and the dimension Ly (width) in the transverse direction Y of the thermal container 1 are, for example, 150 mm or more and 1200 mm or less. The dimension Lz (height) of the thermal container 1 in the up-down direction Z is, for example, 100 mm or more and 600 mm or less.

As described above, the thermal insulation container 1 of this embodiment has a rectangular parallelepiped shape. The thermal insulation container 1 of this embodiment comprises a container body 2 made of foamed resin with an opening 2a at the top, and a lid 3 that covers the opening of the container body. The container body 2 comprises a bottom wall 21 and a peripheral side wall (hereinafter also referred to as the "main body peripheral side wall 22") that extends cylindrically upward from the peripheral edge of the bottom wall 21 and defines the opening 2a at its upper end. The container body 2 of the thermal insulation container 1 of this embodiment has the same shape as the container body 2x of a conventional container.

The container body 2 of this embodiment is a bead foam molded body in which a plurality of foam beads are thermally fused together to form an integrated body. That is, the container body 2 is composed of foam beads obtained by foaming (primary foaming) foamable beads in which resin beads made of resins such as polyethylene resin, polypropylene resin, polystyrene resin, polyester resin, polycarbonate resin, and polyamide resin are impregnated with a foaming agent. More specifically, the container body 2 is formed by filling a mold having a molding space corresponding to the container body 2 with the foam beads, heating the mold with pressurized steam or the like to cause secondary foaming of the foam beads and thermally fusing the foam beads together.

The bottom wall 21 of the container body 2 is formed in a rectangular plate shape in a plan view with rounded corners. The shape of the bottom wall 21 may be a polygon other than a rectangle, a circle, or the like. The upper surface 21a of the bottom wall 21 corresponds to the bottom surface of the container body 2, and is the surface that supports the contents from below. The bottom wall 21 is in a protruding state so that the central portion is higher, as shown in Figures 3A, 3B, 4A, 5, etc. The upper surface 21a of the bottom wall 21 is higher in the vertical direction at the center and lower at the outer periphery. The upper surface 21a is a curved surface, with the center being the highest and the outer periphery close to the main body peripheral side wall 12 being the lowest.

The lower surface 21b of the bottom wall 21 is high in the center and low in the outer periphery, like the upper surface 11a. The upper surface 21a of the bottom wall is a convex curved surface, while the lower surface 21b of the bottom wall 21 is a concave curved surface. The bottom wall 21 has a dome shape with the upper surface protruding upward and the lower surface recessed upward. That is, the bottom wall 21 has a protruding portion 211 in the center that protrudes from the outer periphery. The protrusion of the protruding portion 211 starts slightly inside the inner periphery 22b of the main body peripheral side wall 22, and exists over most of the area of the bottom wall 21. The bottom wall 21 of this embodiment has a rounded dome shape, which allows the load of the contents to be distributed. In order to obtain this effect, the protruding shape of the bottom wall 21 may be another shape, such as a truncated cone shape.

In order to ensure the above-mentioned functions, it is preferable that the floating height (maximum height: Hb (mm) in FIG. 5) at the center of the lower surface 21b of the bottom wall 21 from the ground surface is a certain value or more. For example, the ratio of the floating height (Hb) to the left-right dimension (Lx) of the container body 2 may be 2% or more, 3% or more, or 5% or more. In addition, the ratio (Hb/Lz) of the floating height (Hb (mm)) to the height dimension (Lz (mm)) of the container body 2 can be 1% or more. The ratio (Hb/Lz) of the floating height (Hb) to the height dimension (Lz) of the container body 2 may be 2% or more, 10% or more, or 30% or more. These values are appropriately obtained depending on the magnitude of the force that causes the side walls to collapse inward due to the load and load distribution of the contents, and the number of stacked layers.

The ratio (Hb/Ly) of the floating height (Hb (mm)) to the dimension (Ly (mm)) in the short side direction (front-to-back) of the container body 2 can be 1% or more. The ratio of the floating height (Hb) to the dimension (Ly) in the front-to-back direction of the container body 2 can be 2% or more, 3% or more, or 7% or more. The ratio (Hb/Lx) of the floating height (Hb (mm)) to the dimension (Lx (mm)) in the long side direction (left-to-right) of the container body 2 can be 0.5% or more.

In order to ensure a large internal volume of the container body 2, the ratio of the floating height (Hb) to the front-to-back dimension (Ly) of the container body 2 can be, for example, 10% or less. The ratio of the floating height (Hb) to the front-to-back dimension (Ly) of the container body 2 may be 9% or less, or 8% or less. The ratio of the floating height (Hb) to the left-to-right dimension (Lx) of the container body 2 can be, for example, 10% or less. The ratio of the floating height (Hb) to the left-to-right dimension (Lx) of the container body 2 may be 9% or less, or 8% or less. The ratio (Hb/Lz) of the floating height (Hb) to the height dimension (Lz) of the container body 2 can be, for example, 50% or less. The ratio (Hb/Lz) of the floating height (Hb) to the height dimension (Lz) of the container body 2 may be 40% or less, or 35% or less. The specific dimension of the floating height (Hb) depends on the size of the container body 2 and the mass of the contents, but is usually 5 mm or more and 60 mm or less. It is preferable that the dimension is 15 mm or more and 50 mm or less.

The height of the bottom wall 21 raised in the container body 2 (maximum height: Ha (mm)) can be the same as the value exemplified as the floating height (Hb). That is, the floating height (Ha) of the center can be 5 mm or more and 60 mm or less, and preferably 15 mm or more and 50 mm or less. The specific values of the ratio (Ha/Ly) of the floating height (Ha) to the front-to-back dimension (Ly (mm)) of the container body 2, the ratio (Ha/Lx) to the left-to-right dimension (Lx (mm)), and the ratio (Ha/Lz) to the height dimension (Lz (mm)) can be the same as the values exemplified as the ratio (Hb/Ly, Hb/Lx, Hb/Lz) to the floating height (Hb). The specific dimensions of the floating height (Hb) and the floating height (Ha) and the values of the ratios do not need to be the same and may be different.

The portion of the lower surface 21b of the bottom wall 21 that is located below the circumferential side wall 22 becomes the contact surface 1b when the container body 2 is placed upright. On the other hand, in the region inside the inner circumferential surface 22b of the circumferential side wall 22 (towards the center of the container), only a small portion of the outermost periphery becomes the contact surface, and most of it is raised above the contact surface 1b.

The container body 2 has a bottom wall 21 with a higher center, which not only allows the load applied to the bottom wall 21 by the contents to be transmitted to the peripheral portion of the bottom wall 21, but also allows the water that is generated when ice is used for cooling to be moved toward the peripheral portion of the container, and the load of the water can also be applied to the peripheral portion. Furthermore, the thermal insulation container 1 in this embodiment prevents the contents from getting wet.

In the bottom wall 21 of this embodiment, as shown in FIG. 3A, multiple recesses are formed on the upper surface 21a side. In the bottom wall 21 of this embodiment, as shown in FIG. 3B, multiple recesses are formed on the lower surface 21b side. In this embodiment, the recesses on the upper surface 21a side (hereinafter also referred to as "upper recesses 212a") and the recesses on the lower surface 21b side (hereinafter also referred to as "lower recesses 212b") have the same shape. The upper recesses 212a and the lower recesses 212b may have different shapes.

The upper recess 212a and the lower recess 212b are provided over the entire area of the raised portion 211. The upper surface 21a of the raised portion 211 is not a generally horizontal plane, but is a gently curved surface that slopes downward toward the outside of the container, and the lower surface 21b is similar. The upper recess 212a does not recess in the direction normal to the curved surface, but recesses vertically downward. The lower recess 212b also recesses vertically upward.

The size of the upper recess 212a and the lower recess 212b is larger than a circle with a diameter of 5 mm and smaller than a circle with a diameter of 20 mm. That is, the opening shape of the upper recess 212a when viewed from above is within a circle with a diameter of 20 mm, and has a shape that fits a circle with a diameter of 5 mm inside it. The opening shape of the lower recess 212b when viewed from below is within a circle with a diameter of 20 mm, and has a shape that fits a circle with a diameter of 5 mm inside it. The recess depth of the upper recess 212a and the lower recess 212b is about several mm. The upper recess 212a and the lower recess 212b are arranged so that the center distance is 20 mm to 50 mm, and are arranged at equal intervals in the front, back, left and right directions.

The upper recess 212a functions to prevent the contents from slipping. The upper recess 212a also functions to store water produced by melting ice. In this embodiment, it is considered that the contents may slip and be biased toward the main body peripheral side wall 22 if the thermal insulation container 1 is tilted due to the raised bottom wall 21. If a lot of water accumulates in such a place, the contents will become wet, but in this embodiment, the upper recess 212a can also retain water, and the upper recess 212a functions to prevent the contents from slipping, thereby preventing the contents from getting wet.

The lower recess 212b has a function of preventing the lid 3 from coming off the container body 2 of the lower insulated container 1 that is being removed when the insulated containers 1 are removed one by one from the upper side of the container row 111. In this embodiment, as shown in Figures 4A, 4B, and 5, the lid 3 can be fitted to the container body 2 by a concave-convex fit. Also, in this embodiment, the lid 3 has a shape that corresponds to the lower surface 21b of the bottom wall 21, as shown in Figure 6.

In this embodiment, the upper surface 3a of the lid 3 has a shape corresponding to the lower surface 21b of the bottom wall 21 of the container body 2 so as to reduce dead space and fully utilize the volume of the container assembly 110. That is, in this embodiment, when two thermal insulation containers 1 are stacked vertically, no large gap is generated between the lid 3 of the lower thermal insulation container 1 and the lower surface 21b of the bottom wall 21 of the upper thermal insulation container 1. Therefore, for example, when trying to lift and lower a conventional thermal insulation container 1x from the top of a container row 111 as shown in FIG. 6, the lid 3 of the lower thermal insulation container 1 may come into close contact with the container body 2x of the conventional container, and the lid 3 of the thermal insulation container 1 may come off from the container body 2. The lid 3 may come off not only when lowering the conventional thermal insulation container 1x at the top, but also when lowering thermal insulation containers 1 from the second tier onwards. For this reason, in this embodiment, the lower recess 212b is provided to prevent excessive adhesion between the container body 2 of the upper thermal insulation container 1 and the lid body 3 of the lower thermal insulation container 1.

Instead of providing multiple recesses such as the upper recess 212a, the bottom wall 21 may be provided with multiple protrusions (hereinafter also referred to as "upper protrusions"). These multiple protrusions (upper protrusions) also function effectively to prevent the contents from slipping and getting wet. The size of the upper protrusions in a plan view and the spacing between adjacent upper recesses can be the same as those of the upper recess 212a. Similarly, instead of providing multiple recesses such as the lower recess 212b, the bottom wall 21 may be provided with multiple protrusions (hereinafter also referred to as "lower protrusions"). These multiple protrusions (lower protrusions) are also effective in preventing adhesion with the lid body 3. The size of the lower protrusions in a plan view and the spacing between adjacent upper recesses can be the same as those of the lower recess 212b.

In the thermal insulation container 1 of this embodiment, the lid 3 and the container body 2 are fitted together in a concave-convex manner as described above to prevent the lid 3 from being accidentally removed and to increase the container's airtightness, thereby improving thermal insulation performance and preventing the intrusion of foreign matter.

The shape of the main body peripheral side wall 22 in this embodiment when viewed from above is a rectangular frame, and has rounded corners like the bottom wall 21. The cross-sectional shape of the main body peripheral side wall 22 in a plane perpendicular to the circumferential direction of the main body peripheral side wall 22 is a shape in which the outer half is cut out at the upper end. That is, at the upper end of the main body peripheral side wall 22, the outer circumferential side is one step lower than the inner circumferential side. Therefore, the upper end surface 22c of the main body peripheral side wall 22 in the container body 2 of this embodiment is provided with a high step portion 22c1 provided at a position one step higher and a low step portion 22c2 provided at a position one step lower than the high step portion, and the low step portion 22c2 is provided on the outer circumferential side and the high step portion 22c1 is provided on the inner circumferential side of the low step portion 22c2. Therefore, the main body peripheral side wall 22 of the main body peripheral side wall 22 is thinner at the upper end, and the thickness at the upper end is about half the thickness of the other parts. This thin portion extends in the circumferential direction of the main body side wall 22 and forms a protruding ridge 221 that is used for recessed and protruding engagement with the lid 3.

In this embodiment, the shape of the protrusion 221 when viewed from above is also a rectangular frame with rounded corners, like the main body peripheral side wall 22. The protrusion 221 has a top surface 221a which is a high step on the upper end surface of the main body peripheral side wall 22. In this embodiment, the top surface 221a is a horizontal surface. The protrusion 221 has an inner peripheral surface 221b that hangs down from the inner peripheral edge of the top surface 221a, and an outer peripheral surface 221c that hangs down from the outer peripheral edge of the top surface 221a. The outline of the opening 2a in the container body 2 in this embodiment is defined by the inner peripheral surface 221b of the protrusion 221.

The convex rib 221 protrudes upward so that its cross-sectional shape is rectangular. The thickness of the convex rib 221 is not constant in the inward and outward directions from the lower end to the upper end, and there is a thick portion in the middle. The convex rib 221 is provided with a bulging portion 2211 that bulges inward or outward at any point in the height direction. In this embodiment, the bulging portion 2211 bulges inward so that its cross-sectional shape is a gentle arc. That is, the outer peripheral surface 221c of the convex rib 221 is a vertical surface, and the inner peripheral surface 221b has a portion that is a vertical surface and a portion that bulges inward with a rounded shape. The convex rib 221 extends along the periphery of the opening 2a and is provided continuously so as to go around the opening 2a. The bulging portion 2211 is also provided continuously so as to go around the inner peripheral surface 221b.

The lid body 3 is formed with a groove (hereinafter also referred to as "lid groove 321") that is recessed into a shape that allows the protrusion 221 to enter. The lid groove 321 is recessed upward so that its cross-sectional shape is rectangular. The lid groove 321 has a bottom surface 321a that faces the top surface 221a of the protrusion 221 when the protrusion 221 enters, an inner peripheral surface 321b that hangs down from the inner peripheral edge of the bottom surface 321a, and an outer peripheral surface 321c that hangs down from the outer peripheral edge of the bottom surface 321a. The lid groove 321 of the lid body 3 is formed so that the protrusion 221 is sandwiched between the inner peripheral surface 321b and the outer peripheral surface 321c when the protrusion 221 enters.

As described above, the inner peripheral surface 321b of the lid groove 321 in this embodiment is a portion that comes into contact with the inner peripheral surface 221b of the convex streak 221 when the lid groove 321 and the convex streak 221 are engaged with each other. The outer peripheral surface 321c of the lid groove 321 is a portion that comes into contact with the outer peripheral surface 221c of the convex streak 221 when the lid groove 321 and the convex streak 221 are engaged with each other. On the other hand, the lid groove 321 is formed so that even when the convex streak 221 is inserted to its deepest extent, a small gap is formed between the top surface 221a and the bottom surface 321a. That is, the recess depth of the lid groove 321 in this embodiment is slightly deeper than the protruding height of the convex streak 221.

In this embodiment, the lid groove 321 is configured to have a depth that allows the portion in which the bulge 2211 is formed to enter. Therefore, when the convex strip 221 is inserted into the lid groove 321, the bulge 2211 strongly abuts the convex strip 221 and the inner peripheral surface 321b of the lid groove 321. In this embodiment, the lid body 3 is configured to abut against the inner peripheral surface of the main body peripheral side wall 22 so that it can be fitted into the container body 2, so that when fruits and vegetables and ice packs are stored in the container body 2, the space containing these contents can be made into a closed space with excellent airtightness. Moreover, in this embodiment, the lid body 3 abuts against the inner peripheral surface of the main body peripheral side wall 22 and the bulge 2211 is formed, so that the space containing the contents can be made into a state with excellent airtightness. In addition, in this embodiment, not only can a storage space with excellent airtightness be formed, but also, since the lid body 3 is made of a resin foam sheet, excellent heat retention performance is exhibited.

The lid body 3 in this embodiment is a sheet molded body made of a resin foam sheet as described above. The thickness of the resin foam sheet constituting the lid body 3 is 1 to 4 mm. The expansion ratio of the resin foam sheet is 1.5 to 10 times. The resin constituting the lid body 3 may be the same as or different from the resin constituting the container body 2, and examples of the resin include polyethylene-based resin, polypropylene-based resin, polystyrene-based resin, polyester-based resin, polycarbonate-based resin, polyamide-based resin, and acrylic-based resin.

As shown in Figures 7A and 7B, the lid body 3 of this embodiment includes a main body portion (hereinafter also referred to as "lid main body portion 31") that closes the opening 2a of the container main body 2, and a frame portion 32 provided on the outside of the lid main body portion 31. The shape of the frame portion 32 when viewed from above is a rectangular frame shape similar to the main body peripheral side wall 22, and the lid groove 321 is provided on the lower surface side of the frame portion 32. In other words, the frame portion 32 is provided with a rectangular rib portion 322 that has a rectangular cross-sectional shape that protrudes upward and constitutes the lid groove 321. In this embodiment, the lower surface side of the rectangular rib portion 322 forms the lid groove 321.

The frame 32 is further provided with a flange 323 that extends outward from the lower end of the outer circumferential surface 321c of the lid groove 321. The flange 323 is provided on the outside of the lid groove 321 with a length that reaches the outer circumferential surface of the main body side wall 22. The flange 323 is a part that abuts against the lower step of the upper end surface of the main body side wall 22 when the protrusion 221 and the lid groove 321 are engaged with each other. That is, in the thermal insulation container 1 of this embodiment, the penetration depth of the protrusion 221 is determined by the relative movement distance of the lid body 3 with respect to the main body side wall 22 from when the tip of the protrusion 221 begins to enter the lid groove 321 until the flange 323 abuts against the lower step.

The shape of the opening 2a in the container body 2 in this embodiment is rectangular in plan view. More specifically, the shape of the opening 2a is a rectangle that is long in the left-right direction. The lid body portion 31 has a rectangular outline shape in plan view that corresponds to the shape of the opening 2a so that the opening 2a can be closed without any gaps. The lid body portion 31 in this embodiment has a rectangular shape in plan view, and a dome shape that bulges upward in front view. The shape of the lid body portion 31 has a dome shape that corresponds to the underside 21b of the bottom wall 21 of the container body 2.

The lid body 31 of the lid body 3 does not bulge upward over the entire area, but has quarter-circular (fan-shaped) flat parts at the four corners. That is, the lid body 31 of the lid body 3 of this embodiment has a bulging part 311 that bulges out in a dome shape and a quarter-circular flat part 312 that is not bulged out and is in a flat state.

In the lid body 3 of this embodiment, the flat portion 312 is provided so as to enter the bulge portion 311 from all sides from the outer periphery of the lid main body portion 31 toward the center of the lid main body portion 31, a step is formed between the flat portion 312 and the bulge portion 311 provided at a higher position than the flat portion 312, and an upright wall 313 is formed along the boundary between the flat portion 312 and the bulge portion 311 to connect the flat portion 312 and the bulge portion 311. In other words, the lid main body portion 31 has upright walls that are erected to surround the four corners from the inside in a circular manner.

The flat portion 312 is located at the four corners of the bulge portion 311, and is formed so that the quarter-circular arc 312a is at the center of the lid body 31. The step between the flat portion 312 and the bulge portion 311 has the largest height difference at the arc 312a. The upright wall 313 stands along the arc 312a to connect the arc 312a and the bulge portion 311. The lid body 3 of this embodiment has the upright wall 313 standing along the arc, and therefore exhibits excellent strength against stress applied in the vertical direction at the corners.

The flat portion 312 is also provided at a position that is the midpoint of the long side of the lid body 31, which has a rectangular shape in a plan view. The flat portion 312 provided at the midpoint of the long side of the lid body 31 has a semicircular shape in a plan view. The semicircular flat portion 312 is the same as the quarter-circular flat portions 312 located at the four corners of the lid body 31 in that the arc-shaped portion is toward the center of the lid body 31. The semicircular flat portion 312 is also common to the quarter-circular flat portions 312 at the four corners in that it has a standing wall 313 along the arc.

The lid 3 may be removed from the container body 2, for example, from a corner. That is, the flange 323 may be pulled upward at a corner of the lid 3 fitted to the container body 2, making the corner the starting point for releasing the uneven engagement. Even in such a case, the flat portion 312 and the standing wall 313 are provided on the inside of the corner, reinforcing the corner, so that the uneven engagement can be released smoothly.

The lid body 3 in this embodiment is provided with a gripping portion 34 for lifting the lid body 3 fitted to the container body 2 and removing it from the container body 2. The gripping portion 34 is formed so that the lid body 3 can be gripped from the top side, and is provided at a position that is the center of the lid body portion 31. Therefore, in the operation of removing the lid body 3, not only the operation starting from the corner portion as described above, but also an operation of lifting the center of the lid body portion 31 upward can be performed. In such an operation, an upward stress is applied to the center of the lid body portion 31, but in this embodiment, the upright wall 313 prevents the lid body portion 31 from being significantly deformed and absorbing the stress, and most of the stress can be transmitted to the frame portion 32. The stress transmitted to the frame portion 32 acts as a force that pulls the lower end of the inner peripheral surface 321b of the lid groove 321 inward and diagonally upward. In the thermal insulation container 1 of this embodiment, the application of such a force releases the contact between the bulge 2211 of the protrusion 221 and the inner circumferential surface 321b of the lid groove 321, allowing the lid 3 to be smoothly removed from the container body 2.

In the center of the lid body 31 of the lid body 3, two recesses 314 are arranged side by side, recessed from the top to the bottom of the lid body 3, and the gripping portion 34 is provided between the recesses 314. The two recesses 314 are arranged side by side in the longitudinal direction X in the center of the lid body 31 of the lid body 3. The recesses 314 have a half-moon opening shape in a plan view. The two recesses 314 are arranged so that their opening shapes are line-symmetrical with respect to a line segment parallel to the short direction Y. The recesses 314 are arranged line-symmetrically so that the part that corresponds to the chord of the half-moon shape is on the inside and the part that corresponds to the arc is on the outside. In the inner wall surface of the recess 314, the inner wall surface at the part that corresponds to the chord sags down to reach the deepest part of the recess 314. On the other hand, the inner wall surface extending downward from the part that corresponds to the arc is an inclined surface toward the deepest part. That is, in this embodiment, the recess 314 for making it possible to grasp the grip portion 34 is recessed in a shape that widens the opening area to make it easier to grasp the grip portion 34 and does not reduce the storage space more than necessary.

In this embodiment, a groove (hereinafter, "main body groove 213") is formed on the underside 21b of the bottom wall 21 of the container main body 2 so that the rectangular rib portion 322 fitted into the protruding strip 221 of the lower thermal container 1 can be inserted to prevent the upper thermal container 1 from sliding sideways when the thermal containers 1 are stacked one on top of the other. The main body groove 213 is provided on the outside of the raised portion 211, and is formed so that its shape in a plan view is a rectangular ring shape that surrounds the raised portion 211.

The lid 3 of this embodiment protrudes upward beyond the upper end surface of the main body peripheral side wall 22. Therefore, when stacking the thermal insulation containers 1 or when lowering the upper thermal insulation container 1 of two stacked thermal insulation containers 1, the protruding portion of the lid 3 on the lower thermal insulation container 1 may get caught. In this embodiment, the lid 3 is a sheet molded body, which is more easily deformed than a rigid body such as a bead foam, so even if it gets caught, it is unlikely to be a problem. The resin foam sheet constituting the lid 3 of this embodiment may not be a sheet of a single foam layer, but may be a laminated foam sheet with a non-foamed layer (resin film layer) or the like, and may be a sheet molded so that the upper surface 3a of the lid 3 is composed of the non-foamed layer.

The lid 3, which is constructed using a laminated foam sheet so that the upper surface 3a is the non-foamed layer, exhibits good slipperiness and excellent strength. Therefore, such a lid 3 contributes to improving the work efficiency of the worker who handles the thermal insulation container 1. When the lid 3 is provided with a non-foamed layer, the tip of the flange 323 may be corrugated to prevent the tip of the flange 323 from cutting the fingertips of the worker. In other words, the non-foamed layer may be corrugated to have repeated unevenness in the circumferential direction along the outer periphery of the lid 3, thereby improving the handling of the thermal insulation container 1.

This lid body 3 may have small projections and recesses on one side, as shown in Figures 7C and 7D. In the lid body 3 illustrated in these figures, in addition to a large recess 314 into which a hand can be inserted to enable gripping of the gripping portion 34, small recesses 35a smaller than the recess 314 are arranged side by side on the front, back, left and right sides of the lid body 3. The small recesses 35a open on the top surface 3a of the lid body 3 and are formed to recess vertically downward.

The cover 3 of this embodiment is a sheet molded body, so the shape of the lower surface 3b side is the opposite of the shape of the upper surface 3a side. Therefore, a plurality of small protrusions 35b corresponding to the small recesses 35a are arranged side by side in the front, rear, left and right directions on the lower surface 3b side of the cover 3. The cover 3 of this embodiment may be formed such that the small protrusions 35b are formed on the upper surface 3a side and the small recesses 35a are formed on the lower surface 3b side, as opposed to the form shown in Figures 7C and 7D. The size of the small recesses 35a and the small protrusions 35b in a plan view and the spacing between adjacent small recesses 35a and the like can be made equivalent to the upper recesses 212a and the lower recesses 212b on the bottom wall 21.

In this embodiment, crushed ice or dry ice is used as the ice pack as described above. The ice pack is placed directly on top of the object to be kept warm, such as vegetables, fruits, and seafood, or via a resin film or the like. The lid 3 shown in Figures 7C and 7D reduces the adhesion between the ice pack and the lower surface 3b of the lid 3, and an air layer can be formed between them, which is suitable for achieving high heat retention. In addition, the lid 3 shown in Figures 7C and 7D is also excellent in that it makes it easier for the cold air emitted upward from the ice pack to spread throughout the entire area. The lid 3 of this embodiment is not only made of a material with excellent thermal insulation, such as a resin foam sheet, but also has excellent heat retention performance due to its shape characteristics.

In this embodiment, the strength of the gripping portion 34 is improved by forming small recesses 35a and small protrusions 35b on the resin foam sheet that constitutes the gripping portion 34. That is, in the embodiment illustrated in FIG. 7C and FIG. 7D, in which the resin foam sheet that horizontally connects between the large recesses 314 arranged side by side to enable gripping of the gripping portion 34 has small recesses smaller than the recesses 314, when a force is applied in a direction that draws the recesses 314 together to grip the gripping portion 34, the small recesses 35a and small protrusions 35b are provided, so that deformation of the gripping portion 34 due to the force applied at this time is suppressed, and the gripping portion 34 can be firmly gripped.

The resin foam sheet may be formed, for example, by an extrusion foaming method. A resin foam sheet called a laminated foam sheet may be produced, for example, by a co-extrusion method in which a foam layer and a non-foam layer are co-extruded. The laminated foam sheet may be produced by heat laminating a resin film constituting a non-foam layer onto a resin foam sheet once formed into a single foam layer, or by extrusion lamination. The non-foam layer may be formed on only one side or both sides of the foam layer.

The lid 3 can be a sheet-formed body obtained by thermoforming such a resin foam sheet. The thermoforming can be a conventional method such as press molding (match mold molding), vacuum molding, pressure molding, and vacuum pressure molding.

The thermal insulation container 1 of this embodiment has a lid 3 made of a resin foam sheet, which provides excellent thermal insulation performance and can be made more compact than conventional containers, which is effective in reducing the volume of the packaging structure 100. Note that the thermal insulation container 1 illustrated above has a lid 3 that is fitted to the container body 2 by a concave-convex fit, but the lid of the thermal insulation container 1 may be one that fits either externally or internally to the container body.

The following describes a thermal insulation container according to a second embodiment, which is equipped with a lid that fits inside the container body. The lid 3' provided on the thermal insulation container 1' of the second embodiment has a shape that allows it to be pushed into the container body 2', as shown in Figures 8 and 9. In addition, the thermal insulation container 1' is configured so that a thick lid 30', which is a bead foam molded body, can be further fitted into the thermal insulation container 1' when the lid 3' is fitted inside.

The container body 2' in the thermal insulation container 1' of the second embodiment has a structure similar to that of the container body 2 of the first embodiment. Therefore, the outline shape of the container body 2' in a plan view defined by the outer peripheral surface 22a' of the main body peripheral side wall 22' is a rectangle with rounded corners, and the shape of the upward opening 2a' of the container body 2' defined by the inner peripheral surface 22b' of the main body peripheral side wall 22' is a rectangle smaller than the outline shape of the container body 2' by the thickness of the main body peripheral side wall 22'. The thermal insulation container 1' of the second embodiment is also common to the thermal insulation container 1 of the first embodiment in that the bottom wall 21' is dome-shaped.

The container body 2' has a ridge 221' at the upper end of the body peripheral side wall 22', similar to the container body 2 of the first embodiment. On the other hand, the thick lid 30' has a groove (hereinafter also referred to as "thick lid groove 301'") on the underside that can be fitted with the protrusion 221'. In other words, the thick lid 30' can be fitted to the container body 2' by fitting the protrusions.

The thermal insulation container 1' of the second embodiment is configured so that the lid 3' can be fitted inside the container body 2', and the thick lid 30' can be fitted to the container body 2' into which the lid 3' is fitted, so that the lid 3' and the thick lid 30' can doubly close the opening 2a' of the container body 2'. That is, the lid 3' functions as an inner lid in the thermal insulation container 1', and the thick lid 30' functions as an outer lid.

The lid body 3' in this embodiment has a shape that is slightly larger than the opening 2a' in its natural state, and has elastic deformability so that it can be pushed into the opening 2a'. While the lid body 3 in the first embodiment is configured to cover the upper end of the main body side wall 22 from above with a frame portion 32, the lid body 3' in the second embodiment is configured so that its outer periphery abuts against the inner periphery 22b of the main body side wall 22 and is fixed to the container body 2' by the elastic restoring force of the lid body 3'. Therefore, while the lid body 3 in the first embodiment has a frame portion 32 used to fix the lid body portion 31 to the container body 2 in addition to the lid body portion 31 used to close the opening 2a, the lid body 3' in the second embodiment is configured only with the lid body portion 31'.

In this embodiment, the lid 3' has a groove (hereinafter also referred to as "lid groove 315'") on the periphery to exhibit the above-mentioned elastic deformation. The lid groove 315' is recessed from above toward below, extends in a circumferential direction along the outer periphery of the lid 3', and has a rectangular ring shape in a plan view. The lid groove 315' is provided in such a way that the resin foam sheet constituting the lid 3' is first folded downward at the outer periphery, and then folded back upward on the outside.

The lid body 3' has a lid groove 315', which allows the dimensions in the planar direction to be changed (expanded or contracted) to a certain extent. When the lid body 3' is pushed into the container body 2', the lid groove 315' elastically deforms to narrow the width, and the outer wall portion 315a' of the lid groove 315' abuts against the inner peripheral surface 22b' of the main body peripheral side wall 22' with a restoring force that resists the elastic deformation, and is configured to be engaged with the container body 2' by the frictional force between the inner peripheral surface 22b' and the outer wall portion 315a'. Therefore, the height position of the lid body 3' in this embodiment within the container body 2' is changeable.

The lid 3' of this embodiment is formed so that the dimension from the center to the outer periphery is 2 mm to 6 mm larger than the dimension of the opening 2a' at the top of the container body 2'. In other words, the lid 3' of this embodiment has elastic deformability that allows it to return to its original shape even if it is reduced by 4 mm or more in the left-right or front-back direction. The lid 3' may be able to return to its original shape after being reduced by 6 mm or more, or may be able to return to its original shape after being reduced by 8 mm or more.

The area of the lid 3' inside the lid groove 315' has a dome-shaped bulge 311' like the lid 3' of the first embodiment. The thermal insulation container 1' of the second embodiment is also common to the thermal insulation container 1 of the first embodiment in that two recesses 314' recessed from top to bottom are arranged side by side in the center of the lid main body 31', and the space between the recesses 314' serves as the gripping portion 34'.

Both the lid body 3 of the first embodiment and the lid body 3' of the second embodiment have a dome shape, which has the effect of gathering the crushed ice in the center, for example, when crushed ice is placed on top of the contents after the contents have been placed in the container body 2, 2'. This allows the thermal container 1, 1' to extend the time it takes for the crushed ice to melt completely. In particular, the lid body 3' of the second embodiment can be pushed in to a certain degree of freedom, so it can be lowered, for example, until the bottom surface comes into contact with the crushed ice, and by lowering it further, the crushed ice can be stacked higher in the dome-shaped portion.

The lid 3' of this embodiment may also be formed with the irregularities illustrated in Figures 7C and 7D. In this case, the crushed ice can be prevented from scattering from the center to the outer periphery by engaging with the irregularities on the underside of the lid 3'.

In this embodiment, the thick lid 30', which is a bead foam molded body, can be further fitted in a state where the lid 3' is fitted inside. In addition, the thermal insulation container 1' of this embodiment can attach both the lid 3' and the thick lid 30' to the container body 2' by providing a space between them, so that ice packs such as crushed ice can also be stored in this space. In that case, if the lid 3' is provided with unevenness such as the unevenness illustrated in Figures 7C and 7D, the ice packs can be prevented from moving when the thermal insulation container 1' is tilted, and the ice packs can be prevented from solidifying in one place.

The thick lid 30' in this embodiment has a rectangular shape in plan view similar to that of the container body 2', and has a ceiling wall 302' and a peripheral side wall (hereinafter also referred to as "thick lid peripheral side wall 303'") that hangs down from the peripheral portion of the ceiling wall 302'. The radial thickness of the thick lid peripheral side wall 303' is thicker than the thickness of the protrusion 221'. The thick lid 30' has the thick lid groove 301' in the thick lid peripheral side wall 303' into which the protrusion 221' at the upper end of the main body peripheral side wall 22' can enter. That is, the thick lid groove 301' is provided in the thick lid peripheral side wall 303' by recessing the lower end surface of the thick lid peripheral side wall 303' upward.

The thick lid groove 301' is recessed upward so that its cross-sectional shape is rectangular. The thick lid groove 301' has a bottom surface 301a' that faces the top surface 221a' of the convex rib 221' when the convex rib 221' enters as shown in FIG. 9B, an inner peripheral surface 301b' that hangs down from the inner peripheral edge of the bottom surface 301a, and an outer peripheral surface 301c' that hangs down from the outer peripheral edge of the bottom surface 301a'. The thick lid 30' is formed so that the convex rib 221' is sandwiched between the inner peripheral surface 31b' and the outer peripheral surface 301c' of the thick lid groove 301' when the convex rib 221 enters the thick lid groove 301' and engages with the container body 2'.

In this embodiment, the inner peripheral surface 301b' of the thick lid groove 301' is a portion that contacts the inner peripheral surface 221b' of the convex streak 221' when the thick lid groove 301' and the convex streak 221' are engaged with each other. The outer peripheral surface 301c' of the thick lid groove 301' is a portion that contacts the outer peripheral surface 221c' of the convex streak 221' when the thick lid groove 301' and the convex streak 221' are engaged with each other. On the other hand, the thick lid groove 301' is formed so that even when the convex streak 221' is inserted to the deepest extent, a small gap is formed between the top surface 221a' and the bottom surface 301a'. That is, the recess depth of the thick lid groove 301' in this embodiment is slightly deeper than the protruding height of the convex streak 221'.

The thick cover 30' has a recessed portion 3011' that is recessed in the inner peripheral surface 301b' and can engage with the bulge portion 2211' of the protrusion 221'.

The thick lid may be as shown in Figures 10A and 10B. The thick lid 30" illustrated in these figures has a central portion of the upper surface 30a" raised higher than the peripheral portion. That is, the ceiling wall 302" of this thick lid 30" has a dome shape similar to the lid body 3' of the second embodiment. The thick lid 30" is common to the thick lid 30' illustrated in Figure 9A in that it has a thick lid groove 301" below the thick lid peripheral side wall 303" that extends downward from the outer periphery of the ceiling wall 302".

The ceiling wall 302" in the thick lid 30" shown in Figures 10A and 10B has a curved upper surface that protrudes upward and is convex, while the lower surface is a curved concave surface that recesses upward. More specifically, the ceiling wall 302" has a horizontal portion 3021" whose upper surface is a substantially horizontal plane provided on the periphery, and a bulging portion 3022" that bulges upward inside the horizontal portion 3021". In other words, the bulging portion 3022" in the ceiling wall 302" of this embodiment is surrounded on all sides by the horizontal portion 3021".

The thick lid 30" of this embodiment has an annular rib (hereinafter also referred to as "annular rib 309a") that protrudes downward from the lower surface 30b" side and also protrudes downward from the center of the thick lid 30". The annular rib 309a" has a circular ring shape in a plan view. The annular rib 309a" is provided on the bulge 3022".

The thick lid 30" further includes a rib (hereinafter also referred to as "strip rib 309b") that protrudes downward from the lower surface 30b" and extends in a strip-like shape from each of the four corners of the thick lid 30" toward the center of the thick lid 30". The strip rib 309b" extends from the horizontal portion 3021" beyond the boundary with the bulging portion 3022" toward the center of the thick lid 30". In other words, the strip rib 309b" is provided so as to straddle the horizontal portion 3021" and the bulging portion 3022". The end of the strip rib 309b" on the center side is connected to the annular rib 309a".

In this embodiment, the annular rib 309a" and the strip-shaped rib 309b" have a width of 20 mm or more and a protruding height of 1 mm or more. The width of the annular rib 309a" and the strip-shaped rib 309b" may be 30 mm or more. The protruding height of the annular rib 309a" and the strip-shaped rib 309b" may be 2 mm or more.

In this embodiment, the thick lid 30" can be made thinner because the thick lid 30" has high strength due to the presence of such ribs. Furthermore, the thick lid 30" shown in Figures 10A and 10B has a bulge 3022" which allows the load applied to the upper surface to be distributed toward the peripheral edge, making it possible to make the lid thinner by a synergistic effect with the ribs. The thinning effect achieved by providing ribs can also be achieved with a flat thick lid 30' as shown in Figure 9A.

In this embodiment, the lid 3' has a bulge 311' as described above. The lid 3' is formed so that the center is the highest in the vertical direction. In this embodiment, the strip rib 309a'' does not reach the center of the thick lid 30'', and the center of the thick lid 30'' is located inside the annular rib 309a'', and is recessed further than the annular rib 309a''. Therefore, in this embodiment, the lower surface 30b'' of the thick lid 30'' and the upper surface 3a' of the lid 3' are less likely to interfere with each other. This allows the thermal container 1, 1' of this embodiment to have a compact overall shape while ensuring a large volume for accommodating contents.

As described above, the thermal containers 1, 1' have excellent thermal insulation properties due to the lids 3, 3' as described above, and furthermore, because they hold crushed ice well, they can exhibit thermal insulation performance equivalent to that of conventional containers even if the volume is reduced and the amount of crushed ice stored is reduced. In addition, the lids 3, 3' of this embodiment can form a highly airtight closed space in the container body 2, 2', so that even when a cooling agent such as dry ice is used, cold air is unlikely to leak to the outside, and the thermal containers 1, 1' can exhibit excellent thermal insulation performance. Note that the thermal containers 1, 1' can be used not only for the purpose of cold storage, but also for the purpose of keeping warm contents warm.

We will not go into further detail here, but the thermal container and packaging structure are not limited to the above examples and can be modified in various ways. In other words, the present invention is not limited to the above examples in any way.

1, 1': Heat insulation container, 2, 2': Container main body, 2a, 2a': Opening, 3, 3': Lid body 21: Bottom wall, 22: Main body circumferential side wall, 221: Convex strip,
31: Lid main body, 32: Frame, 321: Lid groove, 322: Rectangular rib, 323: Flange, 34: Grip,
100: Packing structure, 110: Container assembly, 111: Container row

Claims (11)

A packaging structure including a container assembly in which a plurality of thermal insulation containers are assembled together,
The heat-retaining container includes a container body having an opening at an upper portion, and a lid body fitted to the container body to close the opening,
The container body is a bead foam molding,
In the container assembly, a plurality of stages each including a plurality of the thermal insulation containers arranged in a front-rear and left-right direction are stacked in a plurality of stages, and the container bodies and the lids are alternately arranged from bottom to top,
The lid body fitted to at least a part of the container body arranged below the uppermost container body is a sheet molded body made of a resin foam sheet , and
A packaging structure in which a thick lid made of a bead foam molding that is thicker than the sheet molding is fitted onto the uppermost container body . The thermal insulation container is
The container body has a bottom wall and a peripheral side wall extending upward from a peripheral edge of the bottom wall and defining the opening at an upper end thereof;
2. The packaging structure according to claim 1, wherein the lid body which is the sheet molded body is configured so as to be abutted against an inner peripheral surface of the peripheral side wall so as to be fitted to the container body. The upper end of the peripheral side wall is provided with a protruding strip that protrudes upward,
3. The packaging structure according to claim 2, wherein a groove capable of fitting with the ridge is provided on the outer periphery of the lid. 4. The packaging structure according to claim 3, wherein the protruding strip is provided with a bulging portion bulging at least inward or outward at any point in the height direction. The outer peripheral surface of the convex strip is a vertical surface,
5. The packaging structure according to claim 4, wherein the bulge is provided on an inner peripheral surface side of the protrusion. The packaging structure according to claim 2 , wherein the bottom wall of the container body has a plurality of recesses or a plurality of protrusions formed on an upper surface side thereof. The packaging structure according to claim 2 , wherein the bottom wall of the container body has a plurality of recesses or a plurality of protrusions formed on a lower surface side thereof. The packaging structure according to claim 1 , wherein the lid body, which is the sheet molded body , has a plurality of recesses or a plurality of protrusions formed on an upper surface side thereof. The packaging structure according to claim 1 , wherein the lid body which is the sheet molded body has a dome shape. The packaging structure according to claim 1 , wherein the lid body, which is the sheet molded body , is provided with a gripping portion formed so that the lid body can be gripped from an upper surface side. The thermal insulation container is
A packaging structure as described in any one of claims 1 to 10 , wherein the lid body, which is the sheet-formed body, is configured so that it can be fitted internally into the container body, the thick lid can be fitted into the container body into which the lid body is fitted, and the lid body and the thick lid are configured so that the opening of the container body can be doubly sealed.