JP2015160634A - container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a container which has excellent strength and achieves space saving during storage or transportation.SOLUTION: A container includes a container body 20 which is composed of a bottom wall part and a side wall part 24 erected from a periphery of the bottom wall part and made of a foam resin, the container body 20 in which a storage chamber 25 is formed. The side wall part 24 is formed so that the storage chamber 25 narrows toward the bottom wall part. A protruding reinforcement part is formed on both of or one of an outer surface and an inner surface of the side wall part 24.

Description

  The present invention relates to a container.

A container made of foamed resin is used for a container for low-temperature distribution that distributes food or the like by refrigeration or freezing, or a container for distributing food or the like in a warm state because it is lightweight and has excellent heat insulation properties.
Such containers are often stacked and distributed in a state where the contents are accommodated in a container body made of foamed resin and closed (accommodated state). For this reason, in general, in order to improve the strength of the container, the container body has a bottomed rectangular tube shape having a side wall portion perpendicular to the bottom wall portion and is thick.
Such a container body is stored and transported in a stacked state even when the contents are not accommodated (empty state). The container bodies stacked in an empty state have a problem that a space equivalent to the accommodated state is required because the height of the container body is reflected as it is.
In response to these problems, a container has been proposed that saves space in the height direction when empty container bodies are stacked.
For example, the convex portion and the concave portion are alternately provided on the inner periphery of the upper half of the side wall so that both are in a point-symmetrical position with respect to the center line of the container, and the convex of the inner periphery of the upper half is provided on the outer periphery of the lower half of the side wall. A concave portion and a convex portion are provided in correspondence with the concave portion and the concave portion, and the lower half portion of the upper container is made by half-rotating one of the containers stacked in two upper and lower stages around the center line of the container. A laminated container characterized in that it can be selectively fitted and stacked on the upper half of the lower container has been proposed (for example, Patent Document 1).
Further, for example, a gradient is provided on the side wall of the container body so that the cross section increases from the bottom wall side to the opening side, the container body can be stacked, and the thickness of the side wall is 5 mm. As described above, the side wall gradient θ is set to 55 ° to 85 °, and the stacking efficiency Se of the container body is set to 50% <Se ≦ 1.667 × θ-41.685%. A foamed resin container has been proposed (for example, Patent Document 2).

Japanese Utility Model Publication No. 5-92138 JP 2007-176576 A

However, in the invention of Patent Document 1, the height of the upper container body among the stacked container bodies cannot be less than ½.
Moreover, in invention of patent document 2, it is necessary to thicken the thickness of a side wall part, so that the weight of the content becomes large, and thickness reduction of a side wall part cannot be achieved. For this reason, as the contents become heavier, the side wall becomes thicker, and the effect of space saving in the height direction when the container main bodies are stacked is reduced. In addition, when the side wall is thick, the amount of resin increases and the environmental load increases.
Accordingly, an object of the present invention is to provide a container that has excellent strength and can save more space during storage or transportation.

The container of the present invention comprises a bottom wall portion and a side wall portion erected from the periphery of the bottom wall portion, and includes a container body made of a foamed resin in which a storage chamber is formed. The storage chamber is formed so as to be narrowed toward the bottom wall portion, and a convex reinforcing portion is formed on both or one of the outer surface and the inner surface of the side wall portion.
The reinforcing portion is preferably a ridge extending in the vertical direction of the container main body, and the inner surface shape of the container main body can be fitted with the outer surface shape of the container main body when the container main bodies are stacked. It is preferable. The reinforcing portion may be formed on an outer surface of the side wall portion, and a concave portion that receives the reinforcing portion when the container main bodies are stacked may be formed on the inner surface of the side wall portion. The recess may be formed on the inner surface of the side wall, and the outer surface of the side wall may receive the reinforcing portion when the container main bodies are stacked. The said container main body is a bottomed square cylinder shape, The said side wall part may mutually approach as the opposing side wall parts go to the said bottom wall part.

In this paper, we evaluate the space saving in the height direction when stacking container bodies by the “stack rate”. The “stack rate” is a relationship between the height h1 of the container main body and the total height h2 when an arbitrary number of container main bodies are stacked by the following equation (1). It can be evaluated that the smaller the stack rate, the more space saving is achieved in the height direction.
Stack rate (%) = h2 ÷ (h1 × number of stacked) × 100 (1)

  According to the container of the present invention, it is possible to save space during storage or transportation while having excellent strength.

It is a perspective view of the container concerning a first embodiment of the present invention. It is a top view of the container main body of FIG. It is a bottom view of the container main body of FIG. It is IV-IV sectional drawing of FIG. It is sectional drawing of the state which laminated | stacked container main bodies. It is the elements on larger scale of FIG. It is a perspective view of the container concerning a second embodiment of the present invention. It is VIII-VIII sectional drawing of FIG. It is sectional drawing of the container concerning 3rd embodiment of this invention. It is sectional drawing explaining the usage method of the container concerning 4th embodiment of this invention. It is sectional drawing explaining an example of the usage method of the container of this invention.

(First embodiment)
A container according to a first embodiment of the present invention will be described below with reference to the drawings.
The container 1 in FIG. 1 includes a lid 10 and a container body 20.

As shown in FIGS. 1 to 4, the container body 20 includes a bottom wall portion 22 that is rectangular in plan view, and a side wall portion 24 that is erected from the periphery of the bottom wall portion 22, and has a bottomed rectangular tube shape. Yes. An opening 21 is formed at the upper end of the container body 20, and the inside (that is, the space surrounded by the bottom wall portion 22 and the side wall portion 24) is a storage chamber 25.
The opposing side wall portions 24 approach each other as they go from the opening 21 to the bottom wall portion 22. That is, the side wall portion 24 is formed so as to narrow as the storage chamber 25 approaches the bottom wall portion 22.

A flange portion 26 is formed at the upper end of the side wall portion 24 so as to project outward. The flange portion 26 goes around the opening 21.
The flange portion 26 is formed with a main body fitting portion 28 that is a protruding protrusion protruding upward. The body fitting portion 28 circulates around the opening 21.
A fitting groove 27 that is a concave line is formed on the lower surface of the flange portion 26 at the position of the main body fitting portion 28.

On each of the four outer surfaces of the side wall portion 24, a plurality of ridges 30 extending from the lower end of the flange portion 26 toward the bottom wall portion 22 are formed. On each outer surface of the side wall 24, the plurality of ridges 30 are arranged adjacent to each other in the width direction of the ridges 30.
In the present embodiment, the reinforcing portion is composed of a plurality of ridges 30 formed on the outer surface of the side wall portion 24.

  On each of the four inner surfaces of the side wall portion 24, a plurality of concave stripes 32 extending in the vertical direction are formed at the positions of the convex stripes 30. The recess 32 extends from the vicinity of the lower end of the main body fitting portion 28 toward the bottom wall portion 22. On each inner surface of the side wall portion 24, the plurality of recesses 32 are arranged adjacent to each other in the width direction of the recess 32.

  As shown in FIG. 2, on the inner surface of the bottom wall portion 22, there are formed a rib 23 that is a protrusion protruding upward, and a hexagonal recess in plan view that is defined in a honeycomb shape by the rib 23.

The container body 20 is made of a foamed resin. Examples of the foamed resin constituting the container body 20 include polystyrene resins such as polystyrene, high impact polystyrene, styrene-ethylene copolymer, styrene-maleic anhydride copolymer, styrene-acrylonitrile copolymer, and styrene modified. Polyolefin resins, polyolefin resins such as polyethylene, polypropylene, and ethylene-vinyl acetate copolymer, and foams of various synthetic resins such as polyester resins such as polyethylene terephthalate can be used. Among these, an in-mold foam molded article made of expandable particles of polystyrene resin or styrene modified polyolefin resin is preferably used. Of the polystyrene resins, polystyrene is preferred. The styrene-modified polyolefin resin is obtained by impregnating and polymerizing polyolefin resin particles with a styrene monomer. Among the styrene-modified polyolefin resins, styrene-modified polyethylene resins are preferable, for example, those having a styrene component of 40 to 90 mass% are preferable, those having a styrene component of 50 to 85 mass% are more preferable, and styrene components are 55 to 75 mass%. % Is more preferable. Further, the expansion ratio of the foamed resin is preferably 10 to 70 times.
The container body 20 may have a non-foamed layer formed on the surface. Since the non-foamed layer is formed on the surface, the strength of the container body 20 can be further improved.

The magnitude | size of the container main body 20 is suitably determined according to the magnitude | size, quantity, etc. of the content to be accommodated, for example, is made into width 10-50 cm x length 20-150 cm x height 5-50 cm.
The thickness T1 (FIG. 4) of the side wall part 24 is appropriately determined in consideration of the weight of the contents, and is appropriately determined in the range of 5 to 20 mm, for example. The thickness T1 is a distance from the reference surface of the inner surface of the side wall portion 24 to the protruding end of the ridge 30.
The thickness T2 of the bottom wall portion 22 is the same as the thickness T1 of the side wall portion 24. The thickness T2 of the bottom wall portion 22 and the thickness T1 of the side wall portion 24 may be the same or different.

  The angle (inclination angle θ) of the outer surface of the side wall portion 24 with respect to the bottom surface is determined in consideration of the material of the container body 20, the thickness T1 of the side wall portion 24, and the like, and is preferably 50 to 80 °, for example, 60 to 70 °. Is more preferable. If it is less than the lower limit, the strength of the side wall 24 may be reduced, and if it exceeds the upper limit, the stack rate may be increased.

In the present embodiment, the protruding line 30 has a protruding end surface in an arc shape.
The height H1 of the ridge 30 is determined in consideration of the material of the container main body 20, the thickness T2, and the like, and is preferably 1 to 10 mm, and more preferably 3 to 6 mm. If it is less than the lower limit, the strength of the container body 20 may be reduced, and if it exceeds the upper limit, the stack rate may be increased.
The length of the ridge 30 is determined in consideration of the size and material of the container body 20. For example, as shown in FIG. 4, the ratio (h3 / h1 ratio) between the height h1 of the container body 20 and the height h3 of the ridge 30 is preferably 60/100 to 80/100, and 65/100 to 75. / 100 is more preferable. If it is more than the said lower limit, the further improvement of the intensity | strength of the container main body 20 can be aimed at, and if it is below the said upper limit, it will be easy to make the magnitude | size of the flange part 26 sufficient.
50% or more is preferable with respect to the area of the outer surface of the side wall part 24, and 50 to 80% is more preferable. If it is more than the said lower limit, the further improvement of the intensity | strength of a container main body can be aimed at, and if it is below the said upper limit, the increase in the amount of resin usage by excessive reinforcement can be prevented.

  The depth D1 of the recess 32 is determined in consideration of the material of the container body 20, the thickness T1, the height H1 of the protrusion 30, and the like, and is preferably 1 to 10 mm, and more preferably 3 to 6 mm. In addition, the depth D1 is preferably the same as the height H1 of the ridges 30 or larger than the height H1. If the depth D1 is the same as the height H1 or larger than the height H1, when the container bodies 20 are stacked, the ridges 30 of the upper container body 20 are in the ridges 32 of the lower container body 20. The stack ratio can be further reduced.

The main body fitting part 28 becomes wider as it goes to the tip.
The height H2 of the main body fitting portion 28 is determined in consideration of the material of the container main body 20 and the like, and is preferably 5 to 15 mm, for example. If it is less than the said lower limit, there exists a possibility that the effect which forms the main body fitting part 28 may fall. If the value exceeds the upper limit, the strength of the main body fitting portion 28 may be reduced.
The width W1 of the main body fitting portion 28 is determined in consideration of the material of the container main body 20 and is preferably 5 to 15 mm, for example. If it is less than the said lower limit, there exists a possibility that the intensity | strength of the main body fitting part 28 may fall. If it exceeds the upper limit, the amount of resin increases, which may be economically disadvantageous.

The height H3 of the flange portion 26 is determined in relation to the material of the container body 20, and is preferably 35 to 55 mm, and more preferably 40 to 50 mm, for example. If it is more than the said lower limit, the intensity | strength of the container main body 20 can be raised more, and if it is below the said upper limit, it will be easy to make the protrusion 30 formed in the outer surface of the side wall part 24 sufficient length.
The depth D2 of the fitting groove 27 is determined in consideration of the height H2 of the main body fitting portion 28, and is preferably the same as the height H2 of the main body fitting portion 28 or larger than the height H2. If the depth D2 is the same as the height H2 or larger than the height H2, when the container main bodies 20 are stacked, the main body fitting portion 28 of the lower container main body 20 is fitted to the upper container main body 20. Inserted in the mating groove 27, the stack rate can be further reduced.
The width W2 of the fitting groove 27 is determined in consideration of the width W1 of the main body fitting portion 28, and is preferably the same as or larger than the width W1 of the main body fitting portion 28. If the width W2 is the same as or larger than the width W1, when the container main bodies 20 are stacked, the main body fitting portion 28 of the lower container main body 20 is fitted into the fitting groove 27 of the upper container main body 20. Inserted into. For this reason, even if the height H3 of the flange portion 26 is increased, the stack rate can be reduced.

The lid 10 closes the opening 21 and has a rectangular shape in plan view. The lid body 10 is formed with a lid body fitting portion 12 that is a groove that circulates along the periphery on the surface facing the opening 21. The lid fitting portion 12 is configured to receive the main body fitting portion 28 when the lid is closed.
The size of the lid 10 is appropriately determined according to the size of the container body 20.
The material of the lid 10 is not particularly limited, and examples thereof include the same foamed resin and non-foamed resin as the material of the container body 20. The material of the lid 10 may be the same as or different from the material of the container body 20.

Next, the usage method of the container 1 is demonstrated.
FIG. 5 is a cross-sectional view showing a state in which five container main bodies 20 are stacked, and FIG. 6 is an enlarged view of a region X in FIG. The cross section of FIG. 5 is a VV cross section in FIG.
As shown in FIG. 5, the empty container body 20 is stored or transported in a state where a plurality of the container bodies 20 are stacked.
When the container main bodies 20 are stacked with the bottom wall portion 22 facing down, a part of the bottom wall portion 22 and the side wall portion 24 of the upper container main body 20 is inserted into the storage chamber 25 of the lower container main body 20. At this time, the protrusions 30 of the upper container body 20 are fitted into the recesses 32 of the lower container body 20. Thus, since the inner surface shape of the container main body 20 can insert the outer surface shape of the container main body 20 when the container main bodies 20 are stacked, the stack rate can be further reduced.
When the container main bodies 20 are stacked, the main body fitting portion 28 of the lower container main body 20 is fitted into the fitting groove 27 of the upper container main body 20. At this time, since the width of the main body fitting portion 28 becomes wider toward the projecting end, the main body fitting portion 28 is firmly fitted into the fitting groove 27 (FIG. 6). Thus, since the fitting groove 27 can fit the main body fitting portion 28 when the container main bodies 20 are stacked, the stack rate can be further reduced. In addition, when the main body fitting portion 28 is fitted into the fitting groove 27, the flange portion 26 becomes stronger and the opening 21 is less likely to be deformed in a state where the container main bodies 20 are stacked, so that the container can be opened in an empty state. The strength in a state where the main bodies 20 are stacked is increased.

When the contents are stored in the container 1, the contents are stored in the storage chamber 25 of the container body 20, and the opening 21 is closed with the lid 10. At this time, the main body fitting portion 28 is fitted into the lid fitting portion 12. Thus, since the cover fitting part 12 can insert the main body fitting part 28, the opening part 21 becomes difficult to deform | transform in the accommodation state, and the intensity | strength of the container 1 increases.
The containers 1 in the accommodation state are stacked and stored or transported.
The method of stacking the containers 1 in the accommodated state is not particularly limited, and may be stacked in a row so that the lower container 1 is hidden by the upper container 1 in plan view, or the plurality of containers 1 constitute the lower stage. The upper container 1 may be stacked so as to straddle the plurality of lower containers 1.

According to the container 1 of the present embodiment, the side wall portion 24 is formed so that the storage chamber 25 is narrowed toward the bottom wall portion 22, so that the stacking rate when the container main bodies 20 are stacked can be reduced. , Space saving can be achieved.
In addition, since the inner surface shape of the container main body 20 can be fitted into the outer surface shape of the container main body 20, the stack rate can be further reduced.
Furthermore, since the fitting groove 27 is formed at the lower end of the flange portion 26 of the container main body 20, the stack rate can be reduced as compared with the case where the fitting groove 27 is not formed. It is possible to improve the strength in a state where the layers are stacked.

  According to the container 1 of the present embodiment, since the ridges 30 are formed on the outer surface of the side wall portion 24, the strength against the load from above is increased. For this reason, even if it does not make the side wall part 24 too thick, the outstanding intensity | strength can be exhibited, and when the containers 1 are stacked in the accommodation state, the container main body 20 is not easily damaged.

(Second embodiment)
A container according to a second embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the same member as 1st embodiment, and the description is abbreviate | omitted.
A container 100 in FIG. 7 includes a lid 10 and a container main body 120.

As shown in FIGS. 7 to 8, the container body 20 includes a bottom wall portion 122 having a rectangular shape in plan view, and a side wall portion 124 erected from the periphery of the bottom wall portion 122, and has a bottomed rectangular tube shape. Yes.
The opposing side wall parts 124 come closer to each other as they go from the opening 21 to the bottom wall part 122. That is, the side wall portion 124 is formed so as to be narrowed as the storage chamber 25 approaches the bottom wall portion 122.

A flange portion 126 projecting outward is formed at the upper end of the side wall portion 124.
The flange portion 126 is formed with a main body fitting portion 28 that is a protruding protrusion protruding upward.

A plurality of ridges 130 extending in the horizontal direction are formed on each of the four outer surfaces of the side wall portion 124. The ridges 130 are triangular in sectional view, and on each outer surface of the side wall 124, the plurality of ridges 130 are arranged adjacent to each other in the width direction of the ridges 30 (that is, the vertical direction of the container body 120).
In the present embodiment, the reinforcing portion is composed of a plurality of ridges 130 formed on the outer surface of the side wall portion 124. The reinforcement part is stepped as a whole.

  On each of the four inner surfaces of the side wall portion 124, a plurality of concave stripes 132 extending in the horizontal direction are formed at the positions of the convex stripes 130. The concave streak 132 is a triangle in sectional view. On each inner surface of the side wall portion 24, the plurality of concave stripes 32 are arranged adjacent to each other in the width direction of the concave stripes 32 (that is, the vertical direction of the container main body 120). In the present embodiment, the inner surface of the side wall portion 124 is stepped by a plurality of concave stripes 132.

The material of the container body 120 is the same as the material of the container body 20 in the first embodiment.
The thickness of the side wall part 124 is the same as the thickness of the side wall part 24 in the first embodiment, and the thickness of the bottom wall part 122 is the same as the thickness of the bottom wall part 22 in the first embodiment.
The inclination angle of the side wall part 124 is the same as the inclination angle θ of the side wall part 24 in the first embodiment.

The height of the ridge 130 is the same as the height of the ridge 30 in the first embodiment.
The length of the ridge 130 is appropriately determined in consideration of the strength required for the container body 120 and the like.
The depth of the recess 132 is the same as the depth of the recess 32 in the first embodiment.
The length of the concave stripe 132 is determined in consideration of the length of the convex stripe 130 and the like.

  According to this embodiment, since the outer surface and the inner surface of the container main body 120 are both stepped, it is easy to overlap the container main bodies 120 with each other.

(Third embodiment)
A container according to a third embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the same structure as 1st embodiment, and the description is abbreviate | omitted.
A container 200 in FIG. 9 includes a lid 10 and a container main body 220. The container 200 is the same as the container 1 in the first embodiment except that the reinforcing member 240 is provided in the storage chamber 25.

The reinforcing member 240 is provided across the opposing side wall portions 224. The reinforcing member 240 includes a bridging portion 242 that straddles the opposing side wall portions 224 and locking claws 244 that protrude from both ends of the bridging portion 242.
A locking hole 226 into which the locking claw 244 is inserted is formed on the inner surface of the side wall portion 224.
The bridging portion 242 may have a rod shape such as a prismatic shape or a columnar shape, or a flat plate shape.
The material of the reinforcing member 240 is not particularly limited, and examples thereof include the same material as that of the container body 20 in the first embodiment.

  According to the present embodiment, since the reinforcing member 240 is provided across the opposing side wall portions 224, the side walls 224 are prevented from spreading when stacked in the accommodated state, and the strength can be further improved. .

(Fourth embodiment)
A container according to a fourth embodiment of the present invention will be described with reference to FIG.
FIG. 10 is a cross-sectional view showing a state in which the containers 300 in which the contents 350 are stored are stacked, and the container 300 is cut along the short side direction in plan view.
The container 300 includes a lid 310 and a container main body 320.
The lid 310 is the same as the lid 10 of the first embodiment, except that a convex portion 312 is formed in the vicinity of the periphery. The height of the convex part 312 is not specifically limited, For example, you may be 5-15 mm. The magnitude | size of planar view of the convex part 312 is not specifically limited, For example, you may be 10-50 mm x 10-50 mm.
Moreover, the container main body 320 is the same as the container main body 20 of 1st embodiment except for providing the bottom wall part 322 by which the recessed part 321 was formed in the bottom face. The size of the concave portion 321 is set such that the two convex portions 312 arranged in the horizontal direction can be received.

  The containers 300 in the accommodated state are stacked as shown in FIG. That is, two containers 300 arranged in the horizontal direction are set as the lower stage, and the upper container 300 is placed so as to straddle the two lower containers 300. In this state, the protrusion 312 of the lid 310 of the lower container 300 is fitted into the recess 321 of the bottom wall 322 of the upper container 300. For this reason, the stacked containers 300 are stabilized in posture during transportation.

(Other embodiments)
The present invention is not limited to the above-described embodiment.
In the first to fourth embodiments, the container body is a bottomed square cylinder, but the present invention is not limited to this, and the container body is a bottomed triangular cylinder, a bottomed pentagonal cylinder, etc. A bottomed polygonal cylinder other than the bottomed square cylinder may be used, or a bottomed cylinder may be used. In addition, the shape of the lid may be appropriately selected according to the shape of the container body.

  In 1st-4th embodiment, although the reinforcement part (protrusion) is formed in the outer surface of a side wall part, this invention is not limited to this, Both the outer surface of a side wall part, an inner surface, or either one The reinforcement part should just be formed. When the reinforcement part is formed in the inner surface of a side wall part, it is preferable that the recessed part which makes a reinforcement part and a complementary form is formed in the outer surface of a side wall part.

  In 1st-4th embodiment, although the groove which accepts a reinforcement part is formed in the inner surface of a side wall part, this invention is not limited to this, The inner surface of a side wall part may be flat. However, from the viewpoint of further reducing the stack rate, it is preferable that a concave portion that receives the reinforcing portion when the container main bodies are stacked is formed on the inner surface of the side wall portion.

In 1st-4th embodiment, although the reinforcement part is comprised by the protruding item | line extended in an up-down direction or a horizontal direction, this invention is not limited to this.
The reinforcing portion only needs to be a convex shape protruding from the surface of the side wall portion. For example, the reinforcing portion may be a combination of a ridge extending in the vertical direction and a ridge extending in the horizontal direction, a curved line, or a side wall portion. Characters, designs and the like formed so as to protrude from the surface may be used.
However, from the viewpoint of easily forming the container body and increasing the strength of the container body, it is preferable that the reinforcing portion has a protrusion extending in the vertical direction or a protrusion extending in the horizontal direction.

  In 1st, 3rd and 4th embodiment, although the lower end of a protruding item | line has reached the bottom face, this invention is not limited to this, The lower end of a protruding item | line does not need to reach the bottom face. However, from the viewpoint of further improving the strength of the container body, it is preferable that the lower end of the ridge reaches the bottom surface.

  In the first, third, and fourth embodiments, the hexagonal concave portion in plan view defined in a honeycomb shape by ribs is formed on the inner surface of the bottom wall portion, but the present invention is not limited to this. The ribs may be formed such that the recesses are polygonal or circular other than hexagonal.

In the first to fourth embodiments, the containers are stacked with the lid facing upward, but the present invention is not limited to this.
For example, as shown in FIG. 11, the containers 1 with the lid 10 on the upper side and the containers 1 with the lid 10 on the lower side are alternately arranged in the horizontal direction and the lids 10 come into contact with each other. The containers 1 may be stacked so that the wall portions 22 come into contact with each other. By stacking as shown in FIG. 11, the loading efficiency during storage or transportation can be increased.

  Hereinafter, the present invention will be described with reference to examples. However, the present invention is not limited to the following examples.

Example 1
As polystyrene, foamed resin polystyrene particles for food (trade name “HDMF2”, manufactured by Sekisui Plastics Industry Co., Ltd.) were used.The polystyrene particles were supplied to a cylindrical batch type pre-foaming machine, and steam with a blowing pressure of 0.05 MPa was used. To obtain pre-expanded particles (bulk density 0.025 g / cm ³ , expansion ratio = 40 times).
The obtained pre-expanded particles were left for 24 hours in a room temperature atmosphere. Thereafter, the pre-expanded particles were filled in the mold, and the inside of the mold cavity was heated with water vapor at a gauge pressure of 0.08 MPa for 20 seconds. Subsequently, it cooled until the pressure in the cavity of a shaping | molding mold was set to 0.01 Mpa, the mold was opened after that, and the container main body similar to the container main body 20 of 1st embodiment was taken out. The obtained container main body has a plan view length of 490 mm × width of 360 mm, height of 174 mm, flange height of 43 mm, density of 0.025 g / cm ³ (expansion factor 40 times), and other specifications are shown in Table 1. As described in.
Moreover, the cover body similar to 1st embodiment was obtained like the container main body. The obtained lid was 490 mm in length in plan view, 360 mm in width, and 24 mm in thickness.
About the obtained container main body, a stack rate was evaluated and the result is shown in Table 1. Moreover, about a cover body and a container main body, intensity | strength was evaluated and the result is shown in Table 1.

(Example 2)
A container body and a lid were obtained in the same manner as in Example 1 except that no rib was formed on the bottom wall.
About the obtained container main body, a stack rate was evaluated and the result is shown in Table 1. Moreover, about a cover body and a container main body, intensity | strength was evaluated and the result is shown in Table 1.

(Example 3)
A container main body and a lid were obtained in the same manner as in Example 2 except that the fitting groove was not formed in the lower part of the flange part and the height of the flange part was 38 mm.
About the obtained container main body, a stack rate was evaluated and the result is shown in Table 1. Moreover, about a cover body and a container main body, intensity | strength was evaluated and the result is shown in Table 1.

Example 4
A container body and a lid were obtained in the same manner as in Example 3 except that styrene-modified polyethylene (trade name “Piocelan”, manufactured by Sekisui Plastics Co., Ltd.) was used in place of the polystyrene foam particles for food. .
About the obtained container main body, a stack rate was evaluated and the result is shown in Table 1. Moreover, about a cover body and a container main body, intensity | strength was evaluated and the result is shown in Table 1.

(Example 5)
A container body and a lid were obtained in the same manner as in Example 3 except that the container body was the same as the container body of the second embodiment.
About the obtained container main body, a stack rate was evaluated and the result is shown in Table 1. Moreover, about a cover body and a container main body, intensity | strength was evaluated and the result is shown in Table 1.

(Comparative Example 1)
A container main body and a lid were obtained in the same manner as in Example 3 except that the inclination angle of the side wall portion was 90 °, and the ridges that were the reinforcing portions and the concave portions on the inner surface of the side wall portions were not formed.
About the obtained container main body, a stack rate was evaluated and the result is shown in Table 1. Moreover, about a cover body and a container main body, intensity | strength was evaluated and the result is shown in Table 1.

(Comparative Example 2)
A container body and a lid were obtained in the same manner as in Example 3 except that the container body had the same shape as that of FIG.
About the obtained container main body, a stack rate was evaluated and the result is shown in Table 1. Moreover, about a cover body and a container main body, intensity | strength was evaluated and the result is shown in Table 1.

(Comparative Example 3)
A container main body and a lid were obtained in the same manner as in Example 3 except that the reinforcing strips and the concave portions on the inner surface of the side wall portion were not formed.
About the obtained container main body, a stack rate was evaluated and the result is shown in Table 1. Moreover, about a cover body and a container main body, intensity | strength was evaluated and the result is shown in Table 1.

(Comparative Example 4)
A container main body and a lid were obtained in the same manner as in Comparative Example 3 except that the thickness of the side wall was 12.3 mm.
About the obtained container main body, a stack rate was evaluated and the result is shown in Table 1. Moreover, about a cover body and a container main body, intensity | strength was evaluated and the result is shown in Table 1.

(Evaluation method)
<Stack ratio>
As shown in FIG. 5, five container main bodies were stacked, the height h2 was measured, and the stack ratio was obtained by the following equation (2).
Stack rate (%) = h2 ÷ (h1 (174 mm) × 5) × 100 (2)
Stack rate of 40% or less is "◎ (very space-saving)", more than 40% is less than 50% "○ (can save space)", and 50% or more is "x" (space-saving) Is insufficient) ”.

<Strength>
The container body was covered with a lid to form a container, and a load was applied to the container downward from the lid. At this time, the maximum load until the container was broken was defined as strength (N).
The strength of 1700 N or more was evaluated as “◯ (sufficient)”, and less than 1700 N was evaluated as “x (insufficient)”.

<Comprehensive evaluation>
When the evaluation of the stack rate and the evaluation of the strength are both “○” or “◎”, it is evaluated as a comprehensive evaluation “○ (sufficient)” and either or both of the evaluation of the stack rate and the strength are The case of “x” was evaluated as a comprehensive evaluation “× (insufficient)”.

As shown in Table 1, in Examples 1 to 5 to which the present invention was applied, the overall evaluation was “◯”. Especially, the intensity | strength was increasing compared with Examples 3-5 in which the fitting groove was formed and Examples 1 and 2 in which the fitting groove was not formed.
On the other hand, Comparative Examples 1 and 2 in which the inclination angle of the side wall portion is 90 ° are excellent in strength and the stack rate is insufficient. In addition, Comparative Examples 3 to 4 in which the reinforcing portion is not formed have insufficient strength.
From these results, it was confirmed that the container to which the present invention was applied has excellent strength and can save more space during storage or transportation.

1, 100, 200, 300 Container; 10 Lid; 20, 120, 220, 320 Container body; 22, 122, 322 Bottom wall portion; 24, 124, 224 Side wall portion; Storage chamber 25; 30, 130 Convex; 27 Fitting groove; 32, 132 concave

Claims (6)

It comprises a bottom wall part and a side wall part erected from the periphery of the bottom wall part, and includes a container body made of foamed resin in which a storage chamber is formed,
The side wall portion is formed so that the storage chamber is narrowed toward the bottom wall portion,
A convex reinforcing portion is formed on both or either one of the outer surface and the inner surface of the side wall portion.   The container according to claim 1, wherein the reinforcing portion is a ridge extending in a vertical direction of the container body.   3. The container according to claim 1, wherein an inner surface shape of the container main body can be fitted into an outer surface shape of the container main body when the container main bodies are stacked. The reinforcing part is formed on the outer surface of the side wall part,
The container according to claim 3, wherein a concave portion that receives the reinforcing portion when the container main bodies are stacked is formed on an inner surface of the side wall portion. The reinforcing part is formed on the inner surface of the side wall part,
The container according to claim 3, wherein a concave portion that receives the reinforcing portion when the container main bodies are stacked is formed on an outer surface of the side wall portion. The container body is a bottomed rectangular tube shape,
The container according to any one of claims 1 to 5, wherein the side wall portions approach each other as the opposing side wall portions move toward the bottom wall portion.

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