JP2020050435A - Foamed resin container - Google Patents

Abstract

To provide a foamed resin container capable of exhibiting appropriate heat insulation properties when a temperature difference between an external environment and an internal space becomes large.SOLUTION: The foamed resin container includes a container body having an opening opened upward and a lid capable of closing the opening of the container body, in which an internal space capable of containing contents is formed in a closed state where the opening of the container body is closed with the lid, in which a plurality of through holes are formed communicating between the internal space and the external environment, a ratio (S/S×100[%]) of a total area of the through holes (S) to the total area of an outer surface of the container (S) is 0.7% or more and 3.0% or less in the closed state, and an area of the hole on a side of the internal space is greater than or equal to the area of the hole on the side of the external environment, for some or all of the through holes.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a foamed resin container.

  BACKGROUND ART Conventionally, as a container made of foamed resin, for example, a container made of styrene foam has been known. As this type of container, for example, a container body having a rectangular bottom plate and a peripheral side wall extending upward from the peripheral edge of the bottom plate and opening upward in a rectangular shape, and an opening of the container body, A device having a closing lid is known (Patent Document 1).

The foamed resin container described in Patent Literature 1 is configured such that a space is formed inside the container while the opening of the container body is closed. The foamed resin container described in Patent Literature 1 is used by storing foods such as fish and shellfish in an internal space. In the foamed resin container described in Patent Literature 1, a plurality of slits penetrating the peripheral side wall in the thickness direction and extending in the vertical direction are formed in the peripheral side wall of the container body.
When the container described in Patent Literature 1 is moved to an environment where the temperature is significantly different, the temperature of the internal space approaches the temperature of the external environment due to air entering the internal space from the external environment through the slits and the like. In the container described in Patent Literature 1, since a vertically extending slit is simply formed in the container body, the temperature of the internal space may rapidly approach the temperature of the external environment. On the other hand, it takes a very long time to bring the temperature of the internal space closer to the temperature of the external environment, and it may not be possible to cool or warm the contents in the internal space.

  As described above, the container described in Patent Literature 1 has insufficient heat insulation, so that the temperature of the internal space rapidly approaches the temperature of the external environment, or the heat insulation is excessively exhibited, and the internal space is not sufficiently exhibited. Temperature does not change so much that it is difficult to warm or cool the contents.

JP 2008-1389 A

  As described above, the container described in Patent Literature 1 has a problem in that when a temperature difference between the external environment and the internal space is relatively large, a suitable heat insulating property cannot be exhibited.

  An object of the present invention is to provide a foamed resin container having a suitable heat insulating property in view of the above-mentioned problems and the like.

In order to solve the above problems, a foamed resin container according to the present invention includes a container main body that is opened upward and a lid that can close an opening of the container main body. A foamed resin container in which an internal space capable of accommodating contents in a closed state closed with is formed,
A plurality of through holes communicating between the internal space and the external environment are formed,
In the closed state, the ratio (S ₁ / S ₀ × 100 [%]) of the total area (S ₁ ) of the through holes to the total area (S ₀ ) of the outer surface of the container is 0.7% or more and 3.0% or less. And
In some or all of the through holes, the hole area on the side of the internal space is equal to or larger than the hole area on the side of the external environment.

In the foamed resin container having the above configuration, the ratio of the total area (S ₁ ) of the through holes to the total area (S ₀ ) of the outer surface of the container is 0.7% or more and 3.0% or less. When a temperature difference from the internal space is large, a suitable heat insulating property can be exhibited. If the above ratio is less than 0.7%, it may take a very long time to relatively quickly bring the temperature of the internal space to the temperature of the external environment. Therefore, it may be difficult to warm or cool the contents. On the other hand, if the above ratio is larger than 3.0%, the temperature of the internal space rapidly approaches the temperature of the external environment, and there is a possibility that heat insulation may be lost.
In addition, in a part or the whole of the through hole, the hole area on the side of the internal space is equal to or larger than the hole area on the side of the external environment, so that movement of air from the external environment to the internal space through the through hole is suppressed. It goes smoothly without. Thereby, the temperature of the internal space can be relatively quickly brought close to the temperature of the external environment.
As described above, in the foamed resin container having the above configuration, when the temperature difference between the external environment and the internal space becomes large, the temperature of the internal space is reduced while maintaining the appropriate heat insulation. Relatively quickly.

In the foamed resin container of the present invention, it is preferable that a linear rib adjacent to the through-hole is provided, and the through-hole includes a linearly extending slit, and the rib extends in parallel with the slit. More preferably, it is present.
The periphery of the through-hole such as the slit is made of a foamed resin having relatively low strength. Further, although the strength may be further reduced by forming the through-hole, the strength can be secured by the rib.

  In the foamed resin container of the present invention, the container main body has a bottom plate, and a peripheral side wall extending upward from a peripheral edge of the bottom plate and defining the opening at an upper end portion, and the through-hole has a peripheral side wall. Preferably, the ribs extend vertically in the surface of the peripheral side wall.

In the foamed resin container of the present invention, the container body has a bottom plate and a peripheral side wall extending upward from a peripheral edge portion of the bottom plate and defining the opening at an upper end portion,
The lid has a lid plate for closing the opening, and a plurality of protruding pieces protruding from the lower surface side of the lid plate, and the container is closed so that the protruding pieces sandwich the upper end of the peripheral side wall from inside and outside. Preferably, it is attached to the body.
With such a configuration, in the closed state, the lid body can be prevented from moving relative to the container body in the horizontal direction (lateral direction).

In the foamed resin container of the present invention, it is preferable that the projecting piece of the lid is disposed at least at a position sandwiching the upper end portion of the peripheral side wall adjacent to the through hole in the circumferential direction from inside and outside in the closed state.
With such a configuration, in the closed state, the upper end portion of the peripheral side wall adjacent to the through hole in the circumferential direction can be prevented from wobbling in the inward and outward directions by the protrusion of the lid.

  In the foamed resin container of the present invention, it is preferable that the through hole penetrates the peripheral side wall, and the penetrating direction of the through hole is inclined with respect to the thickness direction of the peripheral side wall.

In the foamed resin container of the present invention, the air flow generated in the internal space when the air flows from the external environment into the internal space through the through-hole is parallel or separated from each other by two or more through-holes. It is preferable that the through-hole includes.
According to such a configuration, when air moves from the external environment to the internal space through the two or more through holes, it is possible to suppress the air that has entered the internal space from each through hole from colliding with each other. Thereby, the bias of the temperature distribution in the internal space of the air entering from the external environment can be suppressed.

In the foamed resin container of the present invention, the through hole includes a linearly extending slit, and the slit is a horizontal slit extending along a boundary between the lower surface of the lid and the upper end surface of the peripheral side wall of the container body. And, a vertical slit formed on the peripheral side wall so as to extend in the vertical direction,
The horizontal slit and the vertical slit are preferably connected to each other.
With such a configuration, the movement of air from the external environment to the internal space proceeds more smoothly, and the bias of the temperature distribution in the internal space can be suppressed.

In the foamed resin container of the present invention, the through hole includes a linearly extending slit, the slit includes a plurality of vertical slits formed on the peripheral side wall so as to extend in the up and down direction,
The plurality of vertical slits include two vertical slits extending parallel to each other to the upper edge of the peripheral side wall,
The peripheral side wall has, between the two vertical slits, a section-shaped portion having an upper end portion as a free end,
It is preferable that the lid has a pair of projections that sandwich the section in the closed state.
With such a configuration, a relatively low-strength section having a free upper end can be sandwiched between the pair of projecting pieces, so that the section can be prevented from being damaged in the closed state.

  As described above, the foamed resin container of the present invention has an effect that it can have appropriate heat insulating properties.

The perspective view which looked at the container main part of the container made of the foamed resin of 1st Embodiment from diagonally upward. The perspective view which looked at the lid of the container made of foamed resin of a 1st embodiment from diagonally below. The top view of the container main body of the container made of foamed resin of 1st Embodiment. The side view of the container main body of the container made of the foamed resin of the first embodiment. The figure which looked at the cover of the container made from foamed resin of a 1st embodiment from the lower part. The perspective view which looked at the container main body of the container made of the foamed resin of 2nd Embodiment from diagonally upward. The perspective view which looked at the lid of the container made of foamed resin of a 2nd embodiment from diagonally below. The top view of the container main body of the container made from a foamed resin of 2nd Embodiment. The side view of the container main body of the container made of the foamed resin of 2nd Embodiment. The figure which looked at the lid of the container made of foamed resin of a 2nd embodiment from the bottom. The top view of the container main body of the container made of foamed resin of 3rd Embodiment. The side view of the container main body of the container made from the foamed resin of 3rd Embodiment. The side view of an example of one side wall plate in the container main body used in the example. FIG. 9 is a side view of another example of the one side wall plate in the container body used in the embodiment. FIG. 9 is a side view of another example of the one side wall plate in the container body used in the embodiment. 4 is a graph showing the results of the evaluation test (the thickness of the side wall plate is 5 mm). 4 is a graph showing the results of the evaluation test (the thickness of the side wall plate is 5 mm). 4 is a graph showing the results of the evaluation test (sidewall plate thickness: 15 mm). 4 is a graph showing the results of the evaluation test (sidewall plate thickness: 15 mm). 4 is a graph showing the evaluation test results (sidewall plate thickness: 30 mm). 4 is a graph showing the evaluation test results (sidewall plate thickness: 30 mm).

  Hereinafter, an embodiment of a foamed resin container according to the present invention will be described with reference to the drawings.

1 to 5 show a container made of a foamed resin according to the first embodiment. The foamed resin container includes a container body 2 opened in one direction and a lid 3 capable of closing the opening of the container body 2. In the foamed resin container of the first embodiment, an internal space capable of storing contents is formed in a closed state in which the opening of the container body 2 is closed by a lid.
FIG. 1 is a perspective view when the container main body 2 of the foamed resin container of the first embodiment is viewed obliquely from above in a state of storing contents. FIG. 1 shows the container body 2 with the opening facing upward.
In this specification, the vertical direction and the vertical direction represent the vertical direction in such a state unless otherwise specified. The horizontal direction and the horizontal direction represent the horizontal direction in such a state unless otherwise specified.

  The container made of a foamed resin of the first embodiment includes a container body 2 opened upward, and the container body 2 extends upward from a bottom plate 21 and a peripheral portion of the bottom plate 21 to define the opening at an upper end portion. And a peripheral side wall 22. Further, the foamed resin container of the first embodiment further includes a plate-shaped lid 3 that can close the opening of the container main body 2. The container body 2 and the lid 3 are made of a foamed resin, and are formed by molding foamed particles obtained by, for example, a bead foaming method in a mold.

  Examples of the material of the expanded beads include styrene resins such as polystyrene, and olefin resins such as polyethylene and polypropylene. As the material of the beads, a styrene-based resin is preferable in that it is more excellent in moldability.

  The polystyrene-based resin is obtained by polymerizing a styrene-based monomer. Examples of the polystyrene resin include general-purpose polystyrene resins such as styrene, methylstyrene, ethylstyrene, isopropylstyrene, dimethylstyrene, paramethylstyrene, chlorostyrene, bromostyrene, vinyltoluene, and vinylxylene. Examples include a homopolymer of one kind of monomer or a copolymer of plural kinds of these styrene monomers. Further, a styrene-butadiene copolymer or the like is exemplified.

  The container main body 2 is formed in a housing shape as shown in FIG. 1 and, as shown in FIG. 3, is rectangular in plan view. The opening of the container main body 2 is formed in a rectangular shape (rectangular shape) by an upper end portion inside the peripheral side wall 22.

  The container body 2 is formed so as to be able to store contents therein. Further, it is formed so that contents can be taken in and out through the opening.

  As shown in FIG. 3, the peripheral side wall 22 has a rectangular cylindrical shape formed by four rectangular side wall plates 221, and has a rectangular shape in plan view. In addition, it has a pair of short sides forming such a rectangular short side and a pair of long sides forming a long side.

  The boundary between the short side and the long side has a curved surface. That is, in a plan view of the peripheral side wall 22, the boundary portion of the peripheral side wall 22 is formed so as to draw a curved line. In other words, the peripheral wall 22 has a rectangular shape with four rounded corners in plan view.

  A through hole H is formed in the peripheral side wall 22 to communicate the internal space with the external environment. Specifically, the through hole H penetrates the peripheral side wall 22 (side wall plate 221). The through-hole H in the first embodiment is a horizontally elongated lateral slit Ha that extends linearly. The horizontal slit Ha extends along a boundary between the lower surface of the lid 3 and the upper end surface of the peripheral side wall 22 of the container body 2.

  The horizontal slit Ha is formed so as to cut out the upper end of the side wall plate 221. In other words, when the container main body 2 is not closed by the lid 3, the horizontal slit Ha is opened upward. In other words, the horizontal slit Ha is arranged above the side wall plate 221 such that an upper end lower than the uppermost end of the side wall plate 221 extending in the horizontal direction is formed.

A linear rib adjacent to the through hole (lateral slit Ha) is provided. Preferably, a rib 23 extending in the vertical direction is formed on the inner surface of the peripheral side wall 22 adjacent to the through hole (lateral slit Ha). The rib 23 protrudes inward from the flat inner surface of the container body 2. Specifically, the rib 23 is disposed at a position laterally adjacent to the horizontal slit Ha, and extends to the bottom plate 21 of the container body 2. In other words, the ribs 23 are vertically formed along both horizontal edges of the horizontal slit Ha, and extend to the bottom surface of the bottom plate 21.
The periphery of the slit is made of a foamed resin having relatively low strength. Further, although the strength may be further reduced by forming the slit, the strength can be secured by the ribs 23 described above. In addition, since the ribs 23 extend to the bottom surface, cold air entering from the external environment through the slits is easily guided along the ribs 23 to the container bottom surface.

  Note that the linear rib adjacent to the through hole (lateral slit Ha) may extend downward from just below the through hole (lateral slit Ha) (not shown).

In some or all of the through holes H, the hole area on the side of the internal space is equal to or larger than the hole area on the side of the external environment. In other words, in at least a part of the through hole H, the hole area on the side of the internal space is equal to or larger than the hole area on the side of the external environment.
With such a configuration, the movement of air from the external environment to the internal space via the through-hole H proceeds smoothly without being suppressed. Therefore, the temperature of the internal space can be relatively quickly brought close to the temperature of the external environment.
In the first embodiment, the hole area on the side of the internal space and the hole area on the side of the external environment are the same.

In the first embodiment, in the closed state in which the opening of the container body 2 is closed by the lid 3, the ratio (S ₁ / S) of the total area (S ₁ ) of the through holes H to the total area (S ₀ ) of the outer surface of the container. ₀ × 100 [%]) is 0.7% or more and 3.0% or less. Such a ratio may be 2.0% or less.
With such a configuration, if the above ratio is less than 0.7%, it may take an extremely long time to relatively quickly bring the temperature of the internal space closer to the temperature of the external environment. Therefore, it may be difficult to warm or cool the contents. On the other hand, if the above ratio is larger than 3.0%, the temperature of the internal space rapidly approaches the temperature of the external environment, and there is a possibility that heat insulation may be lost.

The total area (S ₀ ) of the outer surface of the container is the surface area of the entire container body 2 including the hole area of the through hole H. In the present embodiment, the total area (S ₀ ) of the outer surface of the container is the surface area of the entire foamed resin container (including the hole area of the through-hole H) in the closed state in which the opening of the container body 2 is closed by the lid 3. It is.
On the other hand, the hole area of each through-hole H for obtaining the total area (S ₁ ) of the through-holes H depends on the side wall plate 221 (peripheral side wall 22) when the cover 3 closes the opening of the container body 2. This is the hole area when viewed from the outside in the thickness direction. However, when there is a through-hole H whose hole area on the side of the internal space is smaller than the hole area on the side of the external environment, the hole area with the minimum inner diameter (inner hole area) is adopted.

As shown in FIGS. 1, 3, and 4, the container main body 2 has an upper end protruding at the upper end of the peripheral side wall 22 and sandwiched by a plurality of (two) protruding pieces 32 (described later in detail) of the lid 3. Section (high step section) 222. Then, the lid 3 is attached to the container body 2 so that the upper end of the peripheral side wall 22 is sandwiched from inside and outside by a plurality of (two) protruding pieces 32 to be in a closed state.
With such a configuration, in the closed state, the lid 3 can be prevented from moving relative to the container body 2 in the horizontal direction (lateral direction).

  Specifically, a part of the upper end portion of the peripheral side wall 22 has an inner upper end protruding portion (high step portion) 222 formed one step higher and an outer lower step lower than the upper end protruding portion (high step portion) 222. A step is formed by the portion 223. The step between the high step portion 222 and the low step portion 223 is formed in a portion horizontally adjacent to the horizontal slit Ha as shown in FIG. The low step portion 223 formed lower than the high step portion 222 is in a state in which the outside of the upper end of the peripheral side wall 22 is cut out.

  The thickness of the peripheral side wall 22 (side wall plate 221) is not particularly limited, but is usually 3 mm or more and 50 mm or less. The thickness of the peripheral side wall 22 is preferably 5 mm or more and 30 mm or less from the viewpoint that a suitable heat insulating property can be exhibited.

  The bottom plate 21 of the container body 2 is formed to have a rectangular shape when viewed from below.

The bottom plate 21 has a bottom protrusion that fits into a recess formed in the upper part of the lid 3 of another foamed resin container. The bottom protrusion is formed by projecting a central portion of the lower surface of the bottom plate 21 into a rectangular shape slightly smaller than the recess.
By fitting the bottom protrusion of the bottom plate 21 of one container body 2 vertically stacked into the depression of the other lid 3, the plurality of vertically stacked foamed resin containers stabilize the stacked state. Can be maintained.

  The thickness of the bottom plate 21 is not particularly limited, but is usually 5 mm or more and 30 mm or less.

The lid 3 of the first embodiment is formed in a rectangular plate shape so as to close the rectangular opening of the container body 2. The lid 3 has a rectangular lid plate 31 for closing the opening of the container body 2, and a plurality of protruding pieces 32 protruding on the lower surface side of the lid plate 31. The lid 3 has a pair of protruding pieces 32 that sandwich the upper end of the peripheral side wall 22 of the container body 2 in the closed state described above. In other words, the lid 3 is attached to the container main body 2 such that the upper end portion (for example, the above-described upper end convex portion 222) of the peripheral side wall 22 is sandwiched from inside and outside by the plurality of projecting pieces 32 so that the container is closed. .
Specifically, as shown in FIG. 5 and the like, the protruding piece 32 is formed with a plurality of outer fitting protruding pieces 32a arranged along the peripheral edge of the lid 3 and a space between the outer fitting protruding pieces 32a. And a plurality of inner fitting protrusions 32b arranged inside the outer fitting protrusions 32a. The one outer fitting projection 32a and the one inner fitting projection 32b are arranged as a pair so as to sandwich the upper end of the peripheral side wall 22 from inside and outside.
With such a configuration, in the closed state, the lid 3 can be prevented from moving relative to the container body 2 in the horizontal direction (lateral direction).

  The shape of the protruding piece 32 is not particularly limited. When the lid 3 is viewed from below, the shape of the protruding piece 32 is, for example, rectangular, L-shaped, trapezoidal, parallelogram, irregular, or the like.

The protruding piece 32 is disposed at least at a position where the upper end portion (for example, the above-described upper end convex portion (high step portion) 222) of the peripheral side wall adjacent to the through hole H in the circumferential direction is sandwiched from inside and outside in the closed state.
With such a configuration, in the closed state, the protrusion 32 can prevent the upper end of the peripheral side wall adjacent to the through hole H in the circumferential direction from wobbling inward and outward in an unstable manner.

Specifically, in the closed state, the protruding piece 32 is arranged, for example, at a position that fills the above-described cutout portion formed by the low step portion 223 of the container body 2. In addition, for example, they are arranged in an L shape along the edge of the opening including the corner (one of the four corners) of the opening of the container body 2.
The projecting pieces 32 arranged at such two positions can sandwich the above-described upper end convex part (high step part) 222 of the container body 2 inward and outward. With such a configuration, in the closed state, the lid 3 can be prevented from moving relative to the container body 2 in the horizontal direction (lateral direction).

  The protruding piece 32 of the lid 3 and the rib 23 of the container body 2 are arranged at positions where they do not abut on each other in the thickness direction of the peripheral side wall 22 (side wall plate 221) in the closed state.

  In the rectangular parallelepiped foamed resin container of the first embodiment, the length of each side may be, for example, 15 cm or more and 70 cm or less. The size of the horizontal slit Ha may be, for example, 2 cm or more and 10 cm or less × 5 cm or more and 20 cm or less.

  The contents to be stored in the container body 2 are not particularly limited, and include, for example, foods such as fish and shellfish and vegetables, and industrial products.

  Next, a foamed resin container according to a second embodiment will be described with reference to the drawings.

  The foamed resin container of the second embodiment has the same configuration as the foamed resin container of the first embodiment, unless otherwise specified.

6 to 10 show a foamed resin container according to the second embodiment.
FIG. 6 is a perspective view of a container body 2 ′ of the foamed resin container according to the second embodiment as viewed obliquely from above in a state where the contents are stored. FIG. 6 shows the container body 2 ′ with the opening facing upward.
FIG. 7 is a perspective view of the lid 3 ′ of the foamed resin container of the second embodiment when viewed obliquely from below.

  A plurality of through holes H penetrating through the side wall plate 221 are formed in the side wall plate 221 of the peripheral side wall 22. The through-hole H in the second embodiment is a vertically elongated slit Hb extending linearly. The vertical slit Hb extends in the up-down direction and reaches the upper end edge of the peripheral side wall 22.

  The plurality of vertical slits Hb include at least two vertical slits Hb reaching the upper end of the peripheral side wall 22 in parallel with each other. Between the adjacent vertical slits Hb, a section 224 having an upper end as a free end is formed.

  As in the first embodiment, a part of the upper end portion of the section 224 is formed by an inner upper end convex portion (high step portion) 222 formed one step higher, and the upper end convex portion (high step portion) 222. A step is formed by the outer low step portion 223 that is also lower. As shown in FIG. 6 and the like, a step between the high step portion 222 and the low step portion 223 is formed at a portion horizontally adjacent to the upper portion of the vertical slit Hb. The low step part 223 formed lower than the high step part 222 is in a state where the outer side of the upper end part of the peripheral side wall 22 (section-shaped part 224) is cut.

  The lid 3 ′ has a pair of protrusions 32 that sandwich the section 224 in the closed state, as in the first embodiment. The lid 3 ′ is attached to the container main body 2 ′ such that the upper end portion (for example, the above-described upper convex portion 222) of the peripheral side wall 22 is sandwiched from inside and outside by the plurality of projecting pieces 32 so that the container is closed.

The plurality of projecting pieces 32 of the lid 3 ′ are arranged at positions that sandwich the section 224 of the peripheral side wall 22 (side wall plate 221) of the container body 2 ′ in the closed state.
The lid 3 ′ has three or more protruding pieces 32. One piece 32 is brought into contact with either the outside or the inside of the section 224 on the lid 3 ′, and two or more pieces 32 are brought into contact with the other, so that the section 224 is placed inside and outside. Three or more protruding pieces 32 are arranged so as to be sandwiched between them. The two or more protruding pieces 32 on the other side include a pair of protruding pieces 32 which are arranged at positions spaced apart in the circumferential direction of the peripheral side wall 22 and sandwich the section 224 in the circumferential direction.
Specifically, for example, a pair of protruding pieces 32 (two outer fitting protruding pieces 32a) arranged at intervals in the circumferential direction of the lid body 3 ′, when in the closed state, form the peripheral side wall 22 (sidewall plate 221). The section 224 is sandwiched in the circumferential direction. Further, a pair of protrusions 32 (outer fitting protrusions 32a and inner fitting protrusions 32b) arranged at intervals in the inner and outer directions of the lid 3 ′ form the section-shaped portion 224 in the inner and outer directions of the peripheral side wall 22. It is sandwiched. The section-shaped portion 224 is sandwiched between the pair of projecting pieces 32 at, for example, the above-described upper end convex portion (high step portion) 222.
With such a configuration, the section 224 having a relatively low strength whose upper end is a free end can be sandwiched by the pair of projecting pieces 32. Therefore, in the above-described closed state, the section 224 is prevented from being damaged. it can.
In addition, in the closed state, the pair of protrusions 32 sandwich the section 224, so that the lid 3 'can be prevented from moving relative to the container body 2' in the horizontal direction (lateral direction).

On the surface of the peripheral side wall 22, a rib 23 extending in the vertical direction is formed. The rib 23 protrudes inward from the flat inner surface of the container body 2 '. The rib 23 extends in parallel with the vertical slit Hb. The rib 23 extends to the bottom plate 21 of the container body 2 '.
The periphery of the slit is made of a foamed resin having relatively low strength. Further, although the strength may be further reduced by forming the slit, the strength can be secured by the ribs 23 described above.

  The rib 23 is formed on the inner surface of the section 224 so as to be along the vertical slit Hb defining the side edge of the section 224. In the closed state, the rib 23 is arranged so as to engage in the circumferential direction with one or more of the protruding pieces 32 sandwiching the piece-shaped portion 224 from inside and outside. The ribs 23 formed on the inner surface of the section 224 and the projections 32 of the lid 3 ′ are arranged so as to engage in the circumferential direction. The deformation of the section 224, which makes the vertical slit Hb wider and the other vertical slit Hb narrower, can be suppressed.

The plurality of through holes H (longitudinal slits Hb) of the second embodiment have a relationship in which airflows generated in the internal space when air flows from the external environment to the internal space through the through holes H are parallel to or separated from each other. Includes two or more through holes H (vertical slits Hb).
In other words, the penetration direction of the plurality of through-holes H (vertical slits Hb) is inclined (in an oblique direction) with respect to the thickness direction of the side wall plate 221 in one side wall plate 221 of the peripheral side wall 22. ), And both directions are parallel or separated from the outside to the inside of the side wall plate 221.
Specifically, when the side wall plate 221 is viewed from the outside, the through hole on one side and the through hole on the other side of the imaginary axis passing through the center of the container in the vertical direction are separated from the outside toward the inside. Penetrating in the direction.
More specifically, as shown in FIG. 8, in one side wall plate 221, the direction of the through hole H arranged in the right half and the direction of the through hole H arranged in the left half when viewed from the outside. May be a direction in which the side wall plate 221 separates from the outside toward the inside.
According to such a configuration, when air moves from the external environment to the internal space through the two or more through holes H, it is possible to suppress the air that has entered the internal space from each through hole H from colliding with each other. With such a configuration, it is possible to suppress a bias in the temperature distribution in the internal space of the air entering from the external environment.

  It is preferable that the inclination of the through hole H in the penetration direction be 45 ° or less with respect to the thickness direction of the side wall plate 221 when the side wall plate 221 is viewed from above. With such a configuration, cracking of the side wall plate 221 can be suppressed.

  In the rectangular parallelepiped foamed resin container of the second embodiment, the length of each side may be, for example, 15 cm or more and 70 cm or less. The size of the vertical slit Hb may be, for example, 5 cm or more and 20 cm or less × 0.5 cm or more and 5 cm or less. In the vertical slit Hb, the ratio of the vertical / horizontal length is preferably 30 or less.

  Next, a foamed resin container according to a third embodiment will be described with reference to the drawings.

  The foamed resin container of the third embodiment has the same configuration as the foamed resin container of the first embodiment or the second embodiment, unless otherwise specified.

  FIG. 11 and FIG. 12 show a container main body 2 ″ of the foamed resin container of the third embodiment.

In the third embodiment, the through hole H is formed in the peripheral side wall 22. The through hole H includes a slit that extends linearly when the peripheral side wall 22 is viewed from one side in the thickness direction. The slit includes a horizontally long horizontal slit Ha and a vertically long vertical slit Hb.
More specifically, the slit is formed in the lateral slit Ha extending along the boundary between the lower surface of the lid 3 ″ and the upper end surface of the peripheral side wall 22 of the container body 2 ″, and in the peripheral side wall 22 so as to extend in the vertical direction. And the formed vertical slit Hb. The horizontal slit Ha and the vertical slit Hb are connected to each other, and are arranged, for example, to cross each other.
Specifically, one horizontal slit Ha is arranged so as to cut off a part of the upper end of the peripheral side wall 22, and another horizontal slit Ha is located immediately below the above-described horizontal slit Ha and is formed in the peripheral side wall 22. It is located at the bottom. The vertical slits Hb are arranged so as to connect the upper and lower horizontal slits Ha. Thereby, two horizontal slits Ha and one vertical slit Hb are arranged in a horizontal H-shape.
Since the horizontal slit Ha and the vertical slit Hb are connected to each other, the movement of the air from the external environment to the internal space proceeds more smoothly, and the bias of the temperature distribution in the internal space can be suppressed.

In the third embodiment, in some or all of the through holes H (slits), the hole area on the side of the internal space is larger than the hole area on the side of the external environment, as shown in FIG.
With such a configuration, the movement of air from the external environment to the internal space via the through-hole H proceeds more smoothly than when the hole area is the same. With such a configuration, the temperature of the internal space can be brought closer to the temperature of the external environment more quickly.

The foamed resin container can be manufactured by a general method.
Specifically, the container body 2 and the lid 3 of the container made of a foamed resin can be manufactured, for example, by adopting an in-mold foam molding method using a mold.

In the in-mold foam molding method using a mold, raw material beads (pre-expanded beads) are filled in a molding die, and the raw material beads can be expanded by heating the raw material beads by steam. By expanding the raw material beads in a molding die having a limited space volume to a predetermined amount, voids between the expanded beads can be filled, and the beads can be fused and integrated. After the cooling, the mold is removed, and finally the container body 2 and the lid 3 having a predetermined shape can be manufactured.
As the raw material beads, commercially available beads can be used. Examples of the material of the raw material beads include those described above as the material of the foam beads.

  The through hole H may be formed by using a molding die that forms the through hole H during molding. On the other hand, the through hole H may be made by making a hole in the molded container body 2 or the like.

  The foamed resin container may be manufactured by combining, for example, six plate members and assembling them.

The foamed resin container of the present embodiment is as described above, but the present invention is not limited to the above-described foamed resin container.
Further, various modes used in a general foamed resin container can be adopted as long as the effects of the present invention are not impaired.

  In the above embodiment, a rectangular parallelepiped foamed resin container has been described. However, the shape of the foamed resin container of the present invention is not limited to a rectangular parallelepiped, and may be, for example, a columnar shape.

  In the above-described embodiment, the description has been given of the foamed resin container in which the through hole H is formed in the container body 2. However, in the foamed resin container of the present invention, the through hole H is formed in, for example, the lid 3. You may.

  In the above embodiment, the description has been made of the foamed resin container in which the slit is formed as the through hole H. However, in the foamed resin container of the present invention, the shape of the through hole H is, for example, a circle, an ellipse, or a half moon. Shape, triangular shape, trapezoidal shape, parallelogram shape, or irregular shape.

  In the above embodiment, the description has been given of the foamed resin container provided with the ribs 23 on the inner surface of the container body 2. However, in the foamed resin container of the present invention, the ribs 23 It may be provided.

  In the above embodiment, the through hole H (horizontal slit Ha or vertical slit Hb) extending along the boundary between the lower surface of the lid 3 and the upper end surface of the peripheral side wall 22 of the container body has been described. H (horizontal slit Ha or vertical slit Hb) does not need to extend along the boundary between the lower surface of lid 3 and the upper end surface of peripheral side wall 22 of the container body. In other words, the through holes H (horizontal slits Ha, vertical slits Hb) need not be open upward. For example, the through hole H (horizontal slit Ha or vertical slit Hb) may be formed such that the peripheral side wall 22 is hollow when viewed from one side in the thickness direction of the peripheral side wall 22.

  Next, the present invention will be described in more detail by way of examples, but the present invention is not limited thereto.

A foamed resin container was manufactured by assembling a foamed resin side wall plate as follows.
・ Sidewall: Styrofoam
(Size -200 x 200 x 200mm, thickness-5mm)
A container made of foamed resin was assembled using six side wall plates. Specifically, a cubic container body having an internal space was assembled using five side wall plates. Another side wall plate was used as a lid. However, at least in the embodiments, of the two sets of side walls facing each other, the through holes (horizontal slits, vertical slits) shown in Tables 1 and 2 are provided in each set of side walls (two side walls). Was formed.

(Example 1)
・ Two horizontal slits Horizontal slits (notches) Vertical 20 mm × horizontal 40 mm Upper side wall plate Horizontal slit Vertical 10 mm × horizontal 40 mm Lower side wall plate One of the two side wall plates with slits formed (before assembly) is thickened FIG. 13 is a schematic diagram viewed from one side of the direction.

(Example 2)
・ Only one vertical slit Vertical slit 100mm x 10mm
FIG. 14 shows a schematic view of one of the two side wall plates having slits (before assembly) as viewed from one side in the thickness direction.

(Example 3)
・ Two horizontal slits and one vertical slit Horizontal slits (notches) Vertical 20 mm × horizontal 40 mm Upper side wall plate Vertical slits Vertical 100 mm × horizontal 10 mm
Lateral slit 10 mm long × 40 mm wide Lower part of side wall plate FIG. 15 shows a schematic view of one of the two side wall plates provided with slits (before assembly) as viewed from one side in the thickness direction.

(Example 4)
A container was manufactured in the same manner as in Example 1, except that the thickness of the used side wall plate was changed from 5 mm to 15 mm.

(Example 5)
A container was manufactured in the same manner as in Example 2, except that the thickness of the used side wall plate was changed from 5 mm to 15 mm.

  A container was manufactured in the same manner as in Example 1 except that the thickness of the used side wall plate was changed from 5 mm to 30 mm.

(Example 7)
A container was manufactured in the same manner as in Example 2, except that the thickness of the used side wall plate was changed from 5 mm to 30 mm.

(Comparative Example 1)
A container was manufactured in the same manner as in Example 1, except that no through-hole was provided in any of the side wall plates used.

(Comparative Example 2)
As shown in Table 1, a container was manufactured in the same manner as in Example 1 except that the size of the upper horizontal slit was larger and the lower horizontal slit was not formed.

(Comparative Example 3)
As shown in Table 1, a container was manufactured in the same manner as in Example 1 except that the size of the upper horizontal slit was smaller and the lower horizontal slit was not formed.

(Comparative Example 4)
A container was manufactured in the same manner as in Comparative Example 1, except that the thickness of the used side wall plate was changed from 5 mm to 15 mm.

(Comparative Example 5)
A container was manufactured in the same manner as in Comparative Example 1 except that the thickness of the used side wall plate was changed from 5 mm to 30 mm.

<Measurement of temperature change in the inner space of the container>
With respect to each of the containers manufactured as described above, the temperature change in the internal space was measured over time by the following method.
1. When the temperature of the external environment is higher than that of the internal space (heating condition)
A 130 mL glass bottle containing 120 mL of water was prepared, and a thermometer was attached to the surface of the glass bottle. After the glass bottle was placed in the internal space of the container, the container was put into a thermostat, and was left until the temperature of the internal space (the temperature of the thermometer attached to the glass bottle) reached 5 ° C.
Next, the container was placed in another thermostat at 30 ° C., and the temperature of the surface of the glass bottle was measured over time with the thermometer.
In other words, the container in which the temperature of the internal space was 5 ° C. was left still in an external environment where the temperature was 30 ° C.
2. When the temperature of the external environment is lower than that of the internal space (cooling conditions)
The temperature of the surface of the glass bottle was measured over time with the thermometer in the same manner as described above, except that the container in which the temperature of the internal space was 30 ° C. was allowed to stand in an external environment at a temperature of 5 ° C.

FIGS. 16 and 17 are graphs showing the change with time in temperature when the thickness of the side wall plate is 5 mm in Table 1.
FIGS. 18 and 19 show graphs in Table 2 showing the change over time in temperature when the thickness of the side wall plate is 15 mm.
20 and 21 show graphs in Table 2 showing the change over time in temperature when the thickness of the side wall plate is 30 mm.

As understood from FIGS. 16 and 17, in the closed state, the ratio of the total area (S ₁ ) of the through holes to the total area (S ₀ ) of the outer surface of the container (S ₁ / S ₀ × 100 [%]). However, in Examples in which the difference was 0.7% or more and 3.0% or less, when a temperature difference between the external environment and the internal space was large, appropriate heat insulating properties could be exhibited. Specifically, the container of the example showed a moderate heat-insulating property of a relative value of about 55 to about 75% based on the index of the above-described evaluation method with respect to the container of the comparative example having no through hole.
On the other hand, if the above ratio is less than 0.7%, it takes a relatively long time to bring the temperature of the internal space closer to the temperature of the external environment, and the above ratio is higher than 3.0%. When it was large, the temperature of the internal space quickly approached the temperature of the external environment, and the heat insulation was low.
Further, as can be understood from FIGS. 18 to 21, the same result as described above was obtained even when the thickness of the peripheral side wall was different.

2,2 ′, 2 ″: container body,
21: bottom plate,
22: peripheral wall,
221: side wall plate, 222: upper end convex portion (high step portion),
223: low step portion, 224: section-shaped portion,
23: rib,
3,3 ′, 3 ″: lid,
31: lid plate,
32: protruding piece, 32a: outer fitting protruding piece, 32b: inner fitting protruding piece,
H: through hole,
Ha: horizontal slit (slit), Hb: vertical slit (slit).

Claims (10)

An internal space that includes a container main body that opens upward and a lid that can close the opening of the container main body, and that can store contents in a closed state in which the opening of the container main body is closed with the lid. Is a foamed resin container in which is formed,
A plurality of through holes communicating the internal space and the external environment are formed,
In the closed state, the ratio (S ₁ / S ₀ × 100 [%]) of the total area (S ₁ ) of the through holes to the total area (S ₀ ) of the outer surface of the container is 0.7% or more and 3.0% or more. % Or less,
In a part or the whole of the through hole, a hole area on the side of the internal space is equal to or larger than a hole area on a side of the external environment.   The foamed resin container according to claim 1, wherein a straight rib adjacent to the through hole is provided. The through hole includes a slit extending linearly,
The foamed resin container according to claim 2, wherein the rib extends in parallel with the slit. The container body has a bottom plate, and a peripheral side wall extending upward from a peripheral edge portion of the bottom plate and defining the opening at an upper end portion,
The through hole penetrates the peripheral side wall,
The foamed resin container according to claim 2, wherein the rib extends in a vertical direction on a surface of the peripheral side wall. The container body has a bottom plate, and a peripheral side wall extending upward from a peripheral edge portion of the bottom plate and defining the opening at an upper end portion,
The lid has a lid plate that closes the opening, and a plurality of protruding pieces protruding from the lower surface side of the lid plate, and the upper and lower ends of the peripheral side wall are sandwiched by the protruding pieces from the inside and the outside. The foamed resin container according to any one of claims 1 to 4, wherein the container is attached to the container main body so as to be formed.   6. The foamed resin according to claim 5, wherein the projecting piece of the lid is disposed at least at a position sandwiching an upper end portion of the peripheral side wall which is circumferentially adjacent to the through hole in the closed state from inside and outside. container. The through hole penetrates the peripheral side wall,
The foamed resin container according to any one of claims 4 to 6, wherein a penetration direction of the through hole is inclined with respect to a thickness direction of the peripheral side wall.   The through-hole includes two or more through-holes in which airflows generated on the side of the internal space are parallel or separated from each other when air flows from the external environment to the internal space through the through-hole through the through-hole. The container made of a foamed resin according to any one of claims 1 to 7. The through hole includes a slit extending linearly,
The slit includes a horizontal slit extending along a boundary between a lower surface of the lid and an upper end surface of the peripheral wall of the container body, and a vertical slit formed in the peripheral wall so as to extend in a vertical direction. And
The foamed resin container according to any one of claims 4 to 8, wherein the horizontal slit and the vertical slit are connected to each other. The through hole includes a slit extending linearly,
The slit includes a plurality of vertical slits formed on the peripheral side wall so as to extend in a vertical direction,
The plurality of vertical slits include two vertical slits extending parallel to each other and reaching the upper edge of the peripheral side wall,
The peripheral side wall has, between the two vertical slits, a section-shaped portion having an upper end portion as a free end,
The foamed resin container according to any one of claims 4 to 9, wherein the lid has a pair of the protruding pieces that sandwich the section in the closed state.