JP2013154896A - Foamed resin container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foamed resin container capable of suppressing the mixture of peeled foamed beads therein as foreign matter.SOLUTION: A foamed resin container includes a container body having a sheet-like bottom part formed to have a rectangular shape, a sidewall part extending upward from the peripheral edge part of the bottom part, and a rectangular opening facing upward. The container body is molded by a bead foaming method. The upper inner end of the sidewall part is formed to be rounded.

Description

  The present invention relates to a foamed resin container.

  Conventionally, various types of foamed resin containers have been known. Specifically, for example, a plate-shaped bottom portion formed in a rectangular shape and a side wall portion extending upward from the peripheral edge portion of the bottom portion are provided. In addition, a container body that has a rectangular opening toward the top and is formed by a bead foaming method is known (Patent Document 1).

In such a foamed resin container, an opening is formed by the inner upper end of the side wall, and food such as seafood and vegetables is accommodated in the container body through the opening.
In addition, such a container made of foamed resin is formed in a relatively simple shape so that the shape of a mold or the like used at the time of molding by the bead foaming method is as simple as possible and can be manufactured by a simple shape mold or the like. ing. Specifically, such a foamed resin container is formed such that the inner upper end of the side wall is pointed at a right angle.

JP 2004-269019 A

  However, in such a foamed resin container, since the container body is formed by the bead foaming method, for example, a part of the foam beads fixed to each other at the inner upper end portion of the side wall part forming the opening. However, there is a problem that the foamed beads are peeled off by coming into contact with the contents when the contents are put in and out, and the peeled foam beads enter the container body. Specifically, for example, there is a problem that the inner upper end of the side wall of the container body comes into contact with the contents when the contents are put in and out, and the foam beads are peeled off and mixed into the container body as foreign matter.

  This invention makes it a subject to provide the container made from a foamed resin which can suppress that the exfoliated foam bead mixes as a foreign material in view of said problem.

  In order to solve the above problems, a foamed resin container according to the present invention has a plate-shaped bottom portion formed in a rectangular shape and a side wall portion extending upward from the peripheral edge portion of the bottom portion, and is formed in a rectangular shape upward. A foamed resin container comprising an open container body, the container body being formed by a bead foaming method, wherein the inner upper end of the side wall is formed to be rounded.

  In the foamed resin container having the above-described configuration, the inner upper end of the side wall made of foam beads is formed to have a rounded shape, so that the foam beads constituting the inner upper end of the side wall protrude and are arranged. Being suppressed. That is, the foamed beads are prevented from being arranged at the sharp corners. Therefore, even if a force is applied from the outside to the inner upper end, the force is suppressed from being applied to the protruding foam beads, and the force is distributed to the plurality of foam beads fixed to each other. It will be. Thereby, the external force is easily dispersed and applied to the plurality of foam beads, and the foam beads fixed to each other are difficult to peel off. Therefore, it can suppress that the foamed bead which peeled is mixed in a container main body as a foreign material.

  In the foamed resin container of the present invention, the upper part of the side wall part is formed to be one step higher on the inner side than the outer side of the container, and the inner side of the step part formed higher has the roundness, and It is preferable that the outer side of the portion formed one step higher also has a roundness. With such a configuration, there is an advantage that the exfoliated foamed beads can be further prevented from being mixed as a foreign substance.

  As described above, the foamed resin container of the present invention has an effect that it is possible to prevent the peeled foam beads from being mixed as foreign matter.

The perspective view of the state which piled up the container main body of the container made from a foamed resin two up and down. Sectional drawing which cut | disconnected the upper part of the side wall part of a container main body by the surface perpendicular | vertical to the circumferential direction. The bottom view of a container main body. The top view of a container main body. The side view of the container main body which accumulated two up and down. Sectional drawing which cut | disconnected the container main body to the up-down direction.

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

FIG. 1 is a perspective view of a state in which two foamed resin containers 1 of the present embodiment in a state of containing contents are viewed from obliquely above.
FIG. 2 is a cross-sectional view of the upper portion of the side wall 4 of the container body 2 taken along a plane perpendicular to the circumferential direction, and more specifically, a cross-sectional view taken along line YY of FIG. FIG. 3 is a bottom view of the container body 2, and FIG. 4 is a plan view of the container body 2. FIG. 5 is a side view of the container body 2 that is vertically stacked two. 6 is a cross-sectional view of the container body 2 cut in the up-down direction, specifically, a cross-sectional view taken along the line ZZ in FIG.

  The foamed resin container 1 of the present embodiment has a plate-like bottom portion 3 formed in a rectangular shape and a side wall portion 4 extending upward from the peripheral edge of the bottom portion 3 and is opened in a rectangular shape upward. A foamed resin container 1 having a main body 2 formed by a bead foaming method is formed so that the inner upper end portion of the side wall portion 4 is rounded.

  The said container main body 2 is formed in the housing | casing shape as shown in FIG. 1, and is a rectangular shape in planar view as shown in FIG. In the container body 2, the opening is formed in a rectangular shape (rectangular shape) by the inner upper end portion of the side wall portion 4.

  The said container main body 2 is formed so that the content can be accommodated in the inside. Moreover, it is formed so that the contents can be taken in and out through the opening.

  The container body 2 is formed by a bead foaming method. In the container body 2, expanded beads expanded by the bead foaming method are fixed to each other. That is, the container main body 2 includes expanded beads in which raw material beads (preliminarily expanded beads) are expanded, and is configured by expanded beads fixed to each other.

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

  The polystyrene resin is obtained by polymerizing a styrene monomer. Examples of the polystyrene resin include general-purpose polystyrene resins such as styrene, methylstyrene, ethylstyrene, isopropylstyrene, dimethylstyrene, paramethylstyrene, chlorostyrene, bromostyrene, vinyltoluene, and vinylxylene. One type of monomer homopolymer or a copolymer of a plurality of these styrenic monomers can be mentioned. Moreover, a styrene-butadiene copolymer etc. are illustrated.

As shown in FIG. 4, the side wall 4 has a rectangular shape in plan view, and is formed in a flat rectangular tube shape. Moreover, it has a pair of short side part which forms the rectangular short side, and a pair of long side part which forms a long side.
A boundary portion between the short side portion and the long side portion is rounded. That is, the shape of the side wall portion 4 in plan view is strictly a rectangular shape with rounded corners.

  In the upper part of the side wall 4, as shown in FIG. 2, the inside is formed one step higher than the outside of the container, and the inside of the portion formed one step higher (the inner upper end of the side wall 4) is The outer side of the part which has roundness and was formed one step higher also has roundness.

Specifically, a step is formed on the side wall portion 4 by an inner high step portion 4b formed higher by one step and an outer low step portion 4d lower than the high step portion 4b. Moreover, both the inner side and the outer side of the high step part 4b are formed so that it may be round.
Such roundness in the side wall portion 4 is formed along the circumferential direction of the side wall portion 4 as shown in FIGS.
Further, the step difference between the high step portion 4b and the low step portion 4d in the side wall portion 4 is formed along the circumferential direction of the side wall portion 4 as shown in FIGS.

  In the side wall part 4, as shown in FIG. 2, the inner side of the high step part 4b (inner upper end part of the side wall part 4) has a roundness. That is, the inner upper end portion (the corner portion between the inner surface and the upper end surface of the high step portion 4b) of the high step portion 4b in the side wall portion 4 is formed to have a roundness.

  In the said side wall part 4, as shown in FIG. 2, the outer side of the high step part 4b has roundness. That is, the outer upper end portion (the corner portion between the outer surface and the upper end surface of the high step portion 4b) of the high step portion 4b in the side wall portion 4 is formed to have a roundness.

  As shown in FIG. 2, the side wall portion 4 has a low step portion 4d formed lower than the high step portion 4b. That is, the side wall portion 4 is formed with a low step portion 4d in a state where the upper outer side is cut out.

  The low-stage portion 4d and the high-stage portion 4b are each provided with a mold having a corresponding shape at the time of manufacture, and the low-stage portion 4d and the high-stage portion 4b are formed by the mold.

  Due to the roundness inside and outside the high step portion 4b of the side wall portion 4, that is, when the corner portions inside and outside the high step portion 4b are rounded, external force is applied to the corner portion. Even if is added, force is suppressed from being applied to the protruding foam beads, and force is applied to the plurality of foam beads fixed to each other. Therefore, an external force is easily dispersed and applied to the plurality of foam beads, and the foam beads fixed to each other are difficult to peel off. Thus, it can suppress that the peeled foam bead mixes in the container main body 2 as a foreign material.

  The roundness inside and outside the high step portion 4b is preferably formed so as to have a predetermined radius of curvature.

That is, the inner and outer roundness in the high step portion 4b is usually formed so that the radius of curvature is 1 mm to 4 mm in a cross section perpendicular to the circumferential direction of the side wall portion 4. Moreover, it is preferable that the radius of curvature is 2.5 mm to 3.5 mm.
In addition, said curvature radius is measured in the cross section perpendicular | vertical to the circumferential direction of the side wall part 4. FIG.

The roundness of the inner upper end portion (inner side of the high step portion 4b) of the side wall portion 4 is in the range of 1 to 4 mm from the inner surface 4a to the outer side, and in the range of 1 to 4 mm from the upper end of the high step portion 4b to the lower side. Preferably it is formed.
That is, the roundness of the inner upper end portion (inner side of the high step portion 4b) of the side wall portion 4 is within a range (L ₁ ) of ₁ to 4 mm from the inner surface 4a to the outer side, as shown in FIG. it is preferably formed at the upper end of 1~4mm downward from the scope of 4b (L _2).
By forming the roundness in such a range, there is an advantage that the peeling of the foam beads can be suppressed while ensuring the thickness of the upper portion of the side wall portion 4 and maintaining the strength.

The roundness on the outer side of the high step portion 4b of the side wall portion 4 is in the range of 1 to 4 mm from the upper end to the lower side of the high step portion 4b and in the range of 1 to 4 mm inward from the outer surface of the high step portion 4b. Preferably it is formed.
That is, as shown in FIG. 2, the roundness on the outer side of the high step portion 4b of the side wall portion 4 is in the range of 1 to 4 mm (L ₃ ) from the outer surface of the high step portion 4b to the inner side. it is preferably formed in the range of 1~4mm downward from the upper end of 4b (L _4).
By forming the roundness in such a range, there is an advantage that the peeling of the foam beads can be suppressed while ensuring the thickness of the upper portion of the side wall portion 4 and maintaining the strength.

  Although the thickness of the said side wall part 4 is not specifically limited, Usually, it is 8 mm-30 mm.

  As shown in FIG. 3, the bottom portion 3 is formed to have a rectangular shape when viewed from below.

As shown in FIGS. 3 and 5, the bottom portion 3 has a fitting convex portion 3 a formed so as to be fitted into an opening of another container body 2. As shown in FIGS. 3 and 5, the fitting convex portion 3 a is formed by projecting the bottom center portion of the bottom portion 3 into a rectangular shape that is slightly smaller than the opening.
When the fitting convex portion 3a of one container body 2 stacked up and down is fitted into the opening of the other container body 2, the plurality of container bodies 2 and 2 stacked up and down are stably stacked. Can be maintained.

Although the thickness of the center part of the said bottom part 3 is not specifically limited, Usually, it is 8 mm-30 mm.
The thickness of the central portion of the bottom portion 3 is preferably thinner than the thickness of the side wall portion 4. Moreover, it is preferable that the apparent density of the bottom part 3 is 1.1 times or more of the apparent density of the side wall part 4.

The container body 2 is preferably formed so as to draw a circular arc in a cross section as shown in FIG. 6 without making the boundary between the upper surface of the bottom portion 3 and the inner surface 4a of the side wall portion 4 a right angle. That is, as shown in FIG. 6, the bottom 3 is formed so that the thickness is thicker at the peripheral portion than the central portion, and the upper surface (the bottom surface in the container body 2) warps toward the side wall 4 at the peripheral portion. It is preferable to be formed as described above.
With such a configuration, the strength at the boundary portion between the side wall portion 4 and the bottom portion 3 becomes more excellent, and therefore, breakage occurs at the boundary portion between the side wall portion 4 and the bottom portion 3 due to a force generated when the container body 2 is lifted. Can be further suppressed.

  As shown in FIGS. 1, 3, and 5 (a), the container body 2 is formed with a transport recess 5 in which a finger can be inserted when the container body 2 is lifted.

As shown in FIG. 3, the transport recesses 5 are formed one by one at the lower end central part on the outer side of the short side part of the side wall part 4.
In this embodiment, the container main body 2 can be easily lifted by putting a finger into the transport recess 5 and the container main body 2 can be easily transported.

  As shown in FIGS. 1, 3, 4, and 5 (b), the container body 2 is formed with a drain port 6 for discharging the water in the container body 2 to the outside.

  A total of four drain outlets 6 are formed, two at each of the lower ends of the long side of the side wall 4. The drain port 6 is open to the side and is formed so that water does not fall into the lower container body 2 when the container body 2 is stacked.

  According to the drain port 6, the water stored on the bottom surface of the container body 2 can be discharged to the outside. Specifically, for example, when the contents are seafood such as shirasu containing water, the water exuded from the contents and stored in the container body 2 can be discharged to the outside.

  Although the content accommodated in the said container main body 2 is not specifically limited, For example, foods, such as seafood and vegetables, or an industrial product is mentioned.

  When the contents are relatively small seafood such as shirasu, once the peeled expanded beads enter the container body 2, it is difficult to distinguish the expanded beads from the contents (shirasu). It becomes difficult to get rid of. Therefore, there is a possibility that the contents are shipped as a product with foreign matters mixed. From the viewpoint that mixing of the foamed beads peeled off in the container main body 2 is suppressed, relatively small fish and shellfish such as shirasu can be suitably used as the contents of the container main body 2.

The foamed resin container 1 can be manufactured by a general method.
Specifically, the container body 2 of the foamed resin container 1 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 (preliminary foam beads) are filled in a molding die, and the raw material beads can be heated by steam to expand the raw material beads. By expanding the raw material beads in a molding die whose space volume is limited to a predetermined amount, the gaps between the foamed beads can be filled and the beads can be fused and integrated. Then, after cooling, the mold can be removed and finally a container body of a predetermined shape can be manufactured.
In addition, as a raw material bead, what is marketed can be used. Examples of the material of the raw material beads include those described above as the material of the foam beads.

The foamed resin container of the present embodiment is as exemplified above, but the present invention is not limited to the above exemplified foamed resin container.
Moreover, the various aspects used in a general foamed resin container can be employed as long as the effects of the present invention are not impaired.

  For example, the foamed resin container may further include a lid member (not shown) formed so as to close the opening of the container body.

1: foamed resin container 2: container main body 3: bottom part, 3a: fitting convex part 4: side wall part, 4a: inner surface of side wall part, 4b: high step part of side wall part,
4c: outer surface of the side wall part, 4d: low step part of the side wall part 5: concave part for transportation 6: drainage port

Claims (2)

A container body having a plate-like bottom portion formed in a rectangular shape and a side wall portion extending upward from the peripheral edge portion of the bottom portion and opening in a rectangular shape upward is formed, and the container body is formed by a bead foaming method. A foamed resin container,
A foamed resin container, wherein the inner upper end of the side wall is rounded.   The upper part of the side wall portion is formed to be one step higher on the inner side than the outer side of the container, the inner side of the portion formed to be one step higher has the roundness, and the outer side of the portion formed to be one step higher is also round. The foamed resin container according to claim 1, comprising:

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