JP2007230586A - Foamed synthetic resin container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a foamed synthetic resin container which is composed of a container body and a lid made of a synthetic resin and keeps mechanical strength, especially, increased anti-compression strength. <P>SOLUTION: This foamed synthetic resin container is composed of the container body made of the foamed synthetic resin, and the lid made of the foamed synthetic resin. In this case, the container body is composed of a bottom plate having an approximately square shape and side walls which are erected from peripheral edges of the bottom plate. The peripheral edges of the bottom surface have lifted sections which do not touch the ground when a bottom surface is placed on a flat surface. The lid is detachably fitted to the opening of the container body, and has an approximately the same shape as the bottom plate. In the foamed synthetic resin container, for the container body, a load receiving bottom surface extended section which touches the ground when the bottom surface is placed on a flat surface is provided at least at the central section or in the vicinity of the center of confronted two edges of the bottom plate from among the peripheral edges of the bottom surface. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a foamed synthetic resin container used as a food transport box for fresh fish, fruits and vegetables.

  2. Description of the Related Art Conventionally, as a foamed synthetic resin container used as a food transport box for fresh fish, fruits and vegetables, etc., for example, a foamed synthetic resin container in which a container body shown in FIG. 7 and a lid shown in FIG. 8 are combined is known. This conventional foamed synthetic resin container is composed of a bottom plate portion 2 having a substantially rectangular shape and a side wall portion 3 erected from the periphery of the bottom plate portion 2, and is not grounded when the bottom surface is placed on a plane at the periphery of the bottom surface. A foamed synthetic resin container body 1 provided with a bottom raised portion 5 and a foamed synthetic resin lid 7 having substantially the same shape as the bottom plate part 2 detachably attached to the opening of the container body 1. It is configured. 7A is a plan view of the container body 1, FIG. 7B is a side view of the container body 1, and FIG. 8C is a bottom view of the container body 1. FIG. FIG. 4 is a bottom view of the lid 7, (b) is a side view of the lid 7 in a partial cross-sectional view, and (c) is a plan view of the lid 7.

  The conventional foamed synthetic resin container illustrated here has a stepped portion comprising an upper edge convex part 4a at the thickness direction center part and an upper edge notch 4b on both sides in the thickness direction at the upper end of the side wall part 3 of the container body 1. Is provided in the periphery of the lower surface of the lid 7, and a groove 8 is provided in the periphery of the lower surface of the lid 7. By covering the opening of the container body 1 with the lid 7 and pressing, the upper edge convex portion 4a of the container body 1 and the groove 8 of the lid 7 are fitted, and the lid 7 closes the opening of the container body 1. To be fitted. In addition, the side wall 3 on the short side of the container body 1 is provided with a handle notch 6 whose remaining part is a handle when the container body 1 is handled. Further, the bottom surface of the container body 1 is composed of a bottom main part that is grounded when the container body 1 is placed on a flat surface, and a bottom-up part 5 that is provided on the peripheral edge and is not grounded. Furthermore, the upper surface side of the lid 7 is provided with unevenness corresponding to the shape of the bottom surface of the container body 1, and when the foamed synthetic resin container 1 is stacked in multiple stages, the unevenness on the bottom surface of the upper foamed synthetic resin container 1 is provided. The stackability can be improved by fitting.

This type of foamed synthetic resin container is used as a seafood such as fresh fish, a food transport box such as fruits and vegetables. In particular, when storing seafood such as fresh fish, put the seafood such as fresh fish in the container body 1, pack ice-cold ice for cold storage, and attach the lid 7, as shown in FIG. Often stacked. When conventional foamed synthetic resin containers are stacked in multiple stages, as shown in FIG. 10, there is a slight gap between the bottom-up part 5 for stacking provided on the peripheral edge of the bottom surface of the container body 1 and the bottom surface part that is grounded. A new space is born. At this time, when a large loading load is applied to the container body 1, the bottom raised portion 5 is inclined, and this causes the side wall 3 of the container body 1 and the side wall of the lid 7 to bulge outward from the container, as shown in FIG. In addition, cracks 9 and cracks are generated in the vicinity of the bottom raised portion 5, the central portion of the side wall portion 5, the peripheral portion of the lid 7, and the like, which is one of the causes for reducing the loading strength of the container. In addition, as shown in FIG. 11, this deformation has a significant tendency in the central portion on the long side compared to the other portions.
In the test conducted by the present inventors, in the implementation situation of the conventional container comprising the container main body of FIG. 7 and the lid of FIG. 8, the acceleration applied during transportation at 8 kg (fish + ice) / box × 14-stage product is 3G. Assuming that the load applied to the lowermost stage is 312 kgf (load 3060 (N)) (see the graph of the comparative example in FIG. 14), the conventional container approaches the deformation and breaking strength of the container.

For example, techniques disclosed in Patent Documents 1 to 3 have been proposed as conventional techniques for improving the pressure resistance of the foamed synthetic resin container.
In Patent Document 1, in order to increase the strength of the cold storage container, a box body made of a foam material and a cover box made of a foam material that closes an opening of the box body, the box body A cold insulation box is disclosed in which an inner box made of a synthetic resin mixed with antibacterial and antifungal agents is detachably housed along the inner wall surface.

  Patent Document 2 discloses a container composed of a foamed synthetic resin container main body and a lid body, which is partially or entirely downward from the inner peripheral side to the outer peripheral side of the side wall of the container main body. From the inner peripheral side to the outer peripheral side so as to be surface-engaged with the engaged surface provided on the upper end of the side wall of the container body on the lower surface of the container body. And a cover body provided with an engaging surface inclined downward partly or entirely toward the inner surface of the container body side wall and a substantially vertical outer surface that is in surface contact with the inner surface of the container body side wall. A foamed synthetic resin container having a shape that engages with a substantially vertical outer surface of the side surface and the lower surface of the lid is disclosed.

Patent Document 3 includes a rectangular bottom plate and four side walls standing upright from the periphery thereof. An opening is provided at a portion where the bottom plate and the side wall are connected to each other, and an opening provided at a position facing the opening. Is disclosed in a foamed thermoplastic resin fish box.
Utility Model Registration No. 3008603 JP 2005-206246 A Japanese Utility Model Publication No. 55-49343

However, the above-described conventional technique has the following problems.
In the prior art described in Patent Document 1, an inner box separate from the foamed synthetic resin container is used, and this is inserted into the container body of the foamed synthetic resin container to improve the mechanical strength. The cost increases by the amount of the separate inner box, and there is a problem that an inexpensive container cannot be provided.
Moreover, since the operation | work which mounts a separate inner box in the container main body of a foamed synthetic resin container is needed, there exists a problem which a manufacturing man-hour increases. In addition, in order to reuse the container, it is necessary to remove the inner box from the container main body. In this case, there is a problem that the number of work steps increases.
Furthermore, since an inner box separate from the foamed synthetic resin container is used, there is a problem that a storage place for the inner box is required separately from the foamed synthetic resin container.

Further, in the prior art described in Patent Document 2, the engaged surface is inclined, so that when a loaded load is applied, the direction changes to the load toward the outside of the container at the same portion. This leads to deformation and breakage of the part, and there is a problem that the purpose of improving the mechanical strength of the container cannot be achieved.
Further, since the engaged surface of the outer bottom portion of the main body is inclined, there is a problem that a load receiving area received by the same portion at the time of loading is small and the container side wall is deformed to the outside, leading to a decrease in the accumulated pressure strength.
Further, since the engaged surface is inclined, the area of the upper end of the same portion is small, and when another container is loaded or contacted, the same portion may be damaged and the commercial value may be reduced.

  Moreover, in the prior art described in Patent Document 3, since there is no bottom raising portion for stacking on the bottom surface of the container, there is a problem that when the containers are stacked in multiple stages, it is difficult to shift and stack.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a foamed synthetic resin container in which the mechanical strength of the foamed synthetic resin container composed of a synthetic resin container main body and a lid, in particular, the compression strength is increased.

  In order to achieve the above object, the present invention comprises a bottom plate portion having a substantially quadrangular shape and a side wall portion standing from the periphery of the bottom plate portion, and the bottom is raised so as not to ground when the bottom surface is placed on a plane at the periphery of the bottom surface. In the foamed synthetic resin container provided with a portion, a load receiving bottom surface extension that contacts the ground when the bottom surface is placed on a flat surface at least in the central portion or the central vicinity portion of the two opposite sides of the bottom plate portion of the bottom surface periphery. Provided is a foamed synthetic resin container provided with a portion.

  In the foamed synthetic resin container of the present invention, it is preferable that the bottom plate portion has a substantially rectangular shape, and the load receiving bottom surface extension portion is provided in a central portion or a central vicinity portion of two long sides of the bottom plate portion.

  In the foamed synthetic resin container of the present invention, it is preferable that a length of the load receiving bottom surface extension portion is in a range of 1/10 to 1/2 of a long side length of the bottom plate portion.

  In the foamed synthetic resin container of the present invention, when the foamed synthetic resin container is stacked in multiple stages at the position corresponding to the load receiving bottom surface extension at the upper end of the side wall, the load receiving bottom surface extension of the upper foamed synthetic resin container is fitted. It is preferable that a notch is provided.

  Further, the present invention comprises a bottom plate portion having a substantially rectangular shape and a side wall portion standing from the periphery of the bottom plate portion, and a bottom raised portion that is not grounded when the bottom surface is placed on a plane is provided on the periphery of the bottom surface. In a foamed synthetic resin container comprising a foamed synthetic resin container body, and a foamed synthetic resin lid having substantially the same shape as the bottom plate portion detachably attached to the opening of the container body, the container body comprises: A foam-synthesizing method characterized in that a load-receiving bottom surface extending portion that is grounded when the bottom surface is placed on a flat surface is provided at least in the central portion of the two sides facing the bottom plate portion or in the vicinity of the center among the peripheral edges of the bottom surface. A resin container is provided.

  In the foamed synthetic resin container of the present invention, the container main body has the bottom plate portion formed in a substantially rectangular shape, and the load receiving bottom surface extension portion is provided in the central portion or the central vicinity portion of the two long sides of the bottom plate portion. It is preferable.

  In the foamed synthetic resin container of the present invention, it is preferable that a length of the load receiving bottom surface extension portion is in a range of 1/10 to 1/2 of a long side length of the bottom plate portion.

  In the foamed synthetic resin container of the present invention, the container body has a load receiving bottom surface of the upper foamed synthetic resin container when the foamed synthetic resin containers are stacked in multiple stages at a position corresponding to the load receiving bottom surface extension at the upper end of the side wall. It is preferable that a notch into which the extension portion is fitted is provided.

  In the foamed synthetic resin container of the present invention, it is preferable that a built-up portion that fits into a notch provided on the container main body side is provided on the lower surface side of the lid.

  In the foamed synthetic resin container of the present invention, the lid is preferably provided with a notch on the upper surface side at a position corresponding to the load receiving bottom surface extension.

  In the foamed synthetic resin container of the present invention, an upper edge convex portion is provided at the upper end of the side wall portion of the container body in the center in the thickness direction, and the upper edge convex portion is provided on the lower peripheral edge of the lid. It is preferable that a recessed groove to be fitted is provided around.

The foamed synthetic resin container of the present invention comprises a bottom plate portion having a substantially rectangular shape and a side wall portion standing from the periphery of the bottom plate portion, and a bottom raised portion that does not come into contact with the bottom surface periphery when the bottom surface is placed on a flat surface. A foamed synthetic resin container, or a bottom-up part that consists of a bottom plate part that has a substantially rectangular shape and a side wall part that stands up from the periphery of the bottom plate part, and that does not come into contact with the bottom edge when the bottom is placed on a flat surface. In a foamed synthetic resin container comprising a foamed synthetic resin container body provided with a lid made of foamed synthetic resin having substantially the same shape as the bottom plate portion detachably attached to the opening of the container body, Since the load receiving bottom surface extension portion that contacts the ground when the bottom surface is placed on a plane is provided at least in the center portion of the two opposite sides of the bottom plate portion or in the vicinity of the center among the peripheral edges of the bottom surface, Contains food, ice pieces, etc. When stacked, the bottom container is grounded by the bottom surface other than the raised part and the load receiving bottom surface extension part, so that the deformation of the central part of the side wall part, which is easily deformed when a load is applied, is alleviated. Compressive strength can be increased, and when a heavy load is applied, such as the bottom container when the container is packed with contents and ice, the container and lid are cracked compared to conventional products. Is less likely to occur.
As described above, the foamed synthetic resin container of the present invention is less prone to cracking than conventional products when a large load is applied. Therefore, the hermeticity in the container is maintained, and the cold insulation is improved.
As described above, the foamed synthetic resin container of the present invention is less susceptible to cracking than conventional products when a large load is applied, and can prevent collapse of containers stacked in multiple stages.
Since the foamed synthetic resin container of the present invention has a load receiving bottom surface extension at the bottom of the container, the compressive strength of the container can be increased without using a member other than the foamed synthetic resin container, thus increasing the cost. In addition, the strength of the container can be improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 are views showing a first embodiment of a foamed synthetic resin container according to the present invention. FIG. 1A is a plan view of a container body 11A, and FIG. 1B is a partial cross-sectional view of the container body 11A. FIG. 2C is a bottom view of the container body 11A, FIG. 2A is a bottom view of the lid 17A, FIG. 2B is a side view of the lid 17A in partial cross section, and FIG. 2C is a lid 17A. FIG.

  The foamed synthetic resin container of this embodiment comprises a bottom plate portion 12 having a substantially rectangular shape and a side wall portion 13 erected from the periphery of the bottom plate portion 12, and is grounded when the bottom surface is placed on a flat surface at the periphery of the bottom surface. A foam synthetic resin container main body 11A provided with a bottom raising portion 15 that is not provided, and a foamed synthetic resin lid 17A having substantially the same shape as the bottom plate portion 12 that is detachably attached to the opening of the container main body 11A; It is composed of The foamed synthetic resin container of the present embodiment has a load receiving bottom surface extension 20 that contacts the ground when the bottom surface is placed on a flat surface at the center of two long sides of the bottom plate portion 12 of the bottom surface periphery of the container body 11A. It is characterized by providing.

  In the present embodiment, the upper end of the side wall 13 of the container body 11A is provided with a stepped portion comprising an upper edge convex portion 14a at the center in the thickness direction and upper edge notches 14b on both sides in the thickness direction, and A concave groove 18 into which the upper edge convex portion 14a is fitted is provided around the lower peripheral edge portion of the lid 17A. By covering and pressing the opening of the container main body 11A with the lid 17A, the upper edge convex portion 14a of the container main body 11A and the concave groove 18 of the lid 17A are fitted, and the lid 17A closes the opening of the container main body 11A. To be fitted.

  In the present embodiment, the bottom surface of the container body 11A is not grounded, as shown in FIG. 1C, when the container body 11A is placed on a flat surface, and the bottom main part that is grounded. The bottom raising portion 15 and a load receiving bottom surface extending portion 20 which is provided at the center of the two long sides of the bottom plate portion 12 and extends the bottom surface main portion to the side edge. When the container main body 11A is placed on a flat surface, the bottom main portion other than the bottom raising portion 15 and the load receiving bottom extension 20 are installed. The length of the load receiving bottom surface extension 20 is preferably in the range of 1/10 to 1/2 of the long side length of the bottom plate 12. If the length of the load receiving bottom surface extending portion 20 exceeds 1/2 of the long side length of the bottom plate portion 12, it is not preferable because the container may be displaced and the container may be easily collapsed when stacked in multiple stages. Further, if the length of the load receiving bottom surface extension portion 20 is less than 1/10 of the long side length of the bottom plate portion 12, there is a possibility that the compression strength of the multi-layered container cannot be increased, which is not preferable. More preferably, it is in the range of 1/8 to 1/3, and most preferably in the range of 1/6 to 1/3.

  In the present embodiment, the side wall 13 on the short side of the container body 11A is provided with a handle notch 16 whose remaining part serves as a handle when handling the container body 11A.

  In addition, the upper edge convex portion 14a on the long side of the container body 11A has a notch 21 for fitting the load receiving bottom surface extension 20 provided on the bottom surface when only the container body 11A is stacked in multiple stages. Is provided. By providing this notch 21, when only the container main body 11A is stacked in multiple stages, the load receiving bottom surface extension 20 of the upper container main body 11A fits into the notch 21 and the bottom raising portion 15 of the upper container main body 11A. Is in contact with the upper edge convex portion 14a of the lower container main body 11A, and the bottom main portion of the upper container main body 11A is fitted inside the upper edge convex portion 14a of the lower container main body 11A, Even when only the container main bodies 11A are stacked in multiple stages, a sufficient stacking property is ensured, and the container main bodies 11A stacked in multiple stages have a structure that does not easily collapse.

  In the present embodiment, the lid 17A shown in FIG. 2 has a thick plate shape that is substantially the same shape as the bottom plate portion 12 of the container body 11A.

  On the upper surface side of the lid 17A shown in FIG. 2 (c), when the foamed synthetic resin containers having the lid 17A attached to the container body 11A are stacked in multiple stages, irregularities corresponding to the bottom shape of the upper foamed synthetic resin container are formed. Is provided. That is, a convex portion with which the bottom raising portion 15 of the container main body 11A abuts is provided on the peripheral edge of the upper surface of the lid 17A, and a portion corresponding to the load receiving bottom surface extending portion 20 of the convex portion is a notch 22. By providing irregularities corresponding to the bottom surface of the container main body 11A on the upper surface side of the lid 17A, when the foamed synthetic resin containers are stacked in multiple stages, the bottom main part and the bottom extension 20 of the upper container main body 11A are covered. When contacting the flat surface on the upper surface side of 17A, the raised portion 15 of the upper container body 11A contacts the convex portion on the upper surface side of the lid 17A, and sufficient stackability is obtained when the foamed synthetic resin containers are stacked in multiple stages. Secured and multi-staged foamed synthetic resin containers have a structure that does not easily collapse.

  Further, on the lower surface side of the lid 17A, when the lid 17A is attached to the container main body 11A, a concave groove 18 into which the upper edge convex portion 14a of the container main body 11A is fitted is provided around the upper edge portion. A portion of the groove 18 corresponding to the notch 21 formed in the convex portion 14a is fitted into the notch 21 on the container body 11A side to increase the compression resistance of the container and improve the airtightness in the container, thereby keeping the container cool. The build-up part 23 for maintaining the property is provided.

  In the present embodiment, examples of the resin material of the foamed synthetic resin constituting the container body 11A and the lid 17A include thermoplastic resins such as polystyrene resin, polyethylene resin, polypropylene resin, and polyethylene terephthalate resin. Among them, it is preferable to use a polystyrene-based resin because a foamed synthetic resin having a low price and excellent mechanical strength can be obtained. Examples of the polystyrene resin include styrene derivatives such as α-methylstyrene, vinyltoluene, and parachlorostyrene in addition to styrene. In addition, for example, a monomer copolymerizable with styrene such as acrylonitrile, acrylic acid, acrylic acid ester, methacrylic acid ester, or a crosslinkable monomer such as divinylbenzene can be used in combination. A copolymer or styrene homopolymer of 50% by mass or more is preferable.

  Various additives, coloring agents such as dyes, antioxidants, flame retardants, antistatic agents, and the like can be added to the styrenic resin used in the present invention as necessary. Furthermore, the range of 5 to 80 times is preferable and the range of 30 to 70 times is more preferable as the expansion ratio of the foamed synthetic resin to be used. Moreover, as a manufacturing method of a foaming synthetic resin, it can manufacture similarly to the conventionally well-known foaming molding method of a foaming synthetic resin molding.

  The foamed synthetic resin container of the present embodiment has a load receiving bottom surface extension 20 that contacts the ground when the bottom surface is placed on a flat surface at the center of the two long sides of the bottom plate portion 12 of the bottom periphery of the container body 11A. Since the food container and the ice pieces are accommodated in the container and are stacked in multiple stages, the bottom container is grounded with the bottom surface other than the raised portion 15 and the load receiving bottom surface extension 20 when the container is stacked. By doing so, the deformation of the central portion of the side wall portion 13 that is easily deformed when a load is applied can be alleviated, and the compressive strength of the container can be increased, and when the container is packed with contents and ice, When a large load is applied to a container or the like, the container or the lid is less likely to be cracked than the conventional product.

  12 and 13 are diagrams schematically illustrating the operation of the load receiving bottom surface extension 20 when the foamed synthetic resin containers of the present embodiment are stacked in multiple stages. As shown in FIG. 12, when the foamed synthetic resin containers of the present embodiment are stacked in multiple stages, a large load is applied to the lower foamed synthetic resin container. In the conventional container, the lowermost foamed synthetic resin container installed on a flat surface is easily deformed so that the center part of the side wall part bulges outward as shown in FIG. On the other hand, the foamed synthetic resin container of the present embodiment is provided with a load receiving bottom surface extending portion 20 that is grounded on a plane at the center portion of the two long sides of the bottom plate portion 12, as shown in FIG. Since the load receiving bottom surface extension 20 is grounded, deformation of the central portion of the side wall portion 13 is alleviated, and as a result, the compressive strength of the container can be increased as compared with the conventional product.

As described above, the foamed synthetic resin container of the present embodiment is less prone to cracking than conventional products when a large load is applied, so that the airtightness in the container is maintained and the cold insulation is improved.
In addition, as described above, the foamed synthetic resin container according to the present embodiment is less likely to crack when compared with the conventional product when a large load is applied.
Moreover, since the foamed synthetic resin container of this embodiment is the structure which provided the load receiving bottom face extension part 20 in the bottom of the container main body 11A, it can raise the compressive strength of a container, without using members other than a foamed synthetic resin container. Therefore, the strength of the container can be improved without increasing the cost.

  3 and 4 are views showing a second embodiment of the foamed synthetic resin container of the present invention, in which FIG. 3 (a) is a plan view of the container body 11B, and FIG. 3 (b) is a partial sectional view of the container body 11B. FIG. 4C is a bottom view of the container body 11B, FIG. 4A is a bottom view of the lid 17B, FIG. 4B is a side view of the lid 17B in partial cross-section, and FIG. 4C is a lid 17B. FIG.

  The foamed synthetic resin container of this embodiment comprises a bottom plate portion 12 having a substantially rectangular shape and a side wall portion 13 erected from the periphery of the bottom plate portion 12, and is grounded when the bottom surface is placed on a flat surface at the periphery of the bottom surface. A foamed synthetic resin container main body 11B provided with a bottom raised portion 15 that is not provided, and a foamed synthetic resin lid 17B that has substantially the same shape as the bottom plate part 12 that is detachably attached to the opening of the container main body 11B. It is composed of The foamed synthetic resin container of the present embodiment is similar to the first embodiment when the bottom surface is placed on the plane at the center of the two long sides of the bottom plate portion 12 of the bottom periphery of the container body 11B. A load receiving bottom surface extension 20 for grounding is provided.

  In the present embodiment, the upper end of the side wall 13 of the container main body 11B is mostly a flat surface, and only the container main body 11B is stacked in a position corresponding to the load receiving bottom surface extension 20 provided on the bottom surface. In this case, a notch 21 for fitting the load receiving bottom surface extension 20 provided on the bottom surface is provided. By providing this notch 21, when only the container body 11B is stacked in multiple stages, the load receiving bottom surface extension 20 of the upper container body 11B is fitted into the notch 21, and the bottom raising part 15 of the upper container body 11B is The upper main body 11B of the lower container body 11B is in contact with the flat portion of the upper edge of the lower container body 11B, and the bottom main part of the upper container body 11B is fitted inside the upper edge of the lower container body 11B. A sufficient stacking property is ensured even when the containers are stacked, and the container bodies 11B stacked in multiple stages have a structure that does not easily collapse.

  In the present embodiment, the bottom surface of the container main body 11B is provided at the bottom main part that contacts the ground when the container main body 11B is placed on a flat surface, as in the case of the container main body 11A of the first embodiment, and the peripheral portion thereof. The bottom raising portion 15 that is not grounded and the load receiving bottom surface extension portion 20 that is provided at the center portion of the two long sides of the bottom plate portion 12 and extends the bottom surface main portion to the side edge. When this container main body 11B is placed on a flat surface, the bottom main part other than the bottom raising part 15 and the load receiving bottom extension 20 are installed.

  In addition, the side wall 13 on the short side of the container body 11B is provided with a handle notch 16 that becomes the handle when the remaining part handles the container body 11B, as in the case of the container body 11A of the first embodiment. .

  In the present embodiment, the lid 17B shown in FIG. 4 has a thick plate shape that is substantially the same shape as the bottom plate portion 12 of the container body 11B.

  On the upper surface side of the lid 17B shown in FIG. 4C, when the foamed synthetic resin containers having the lid 17B mounted on the container body 11B are stacked in multiple stages, irregularities corresponding to the bottom shape of the upper foamed synthetic resin container are formed. Is provided. That is, a convex portion with which the bottom raising portion 15 of the container body 11B abuts is provided on the peripheral edge of the upper surface of the lid 17B, and a portion corresponding to the load receiving bottom surface extension portion 20 of the convex portion is a notch 22. By providing irregularities corresponding to the bottom surface of the container main body 11B on the upper surface side of the lid 17B, when the foamed synthetic resin containers are stacked in multiple stages, the bottom main portion and the bottom extension 20 of the upper container main body 11B are covered. 17B is in contact with the flat surface on the upper surface side, and the raised portion 15 of the upper container body 11B is in contact with the convex portion on the upper surface side of the lid 17B. Secured and multi-staged foamed synthetic resin containers have a structure that does not easily collapse.

  Further, on the lower surface side periphery of the lid 17B, there is a flat portion 18B with which the upper edge of the container body 11B abuts when the lid 17B is attached to the container body 11B, and a convex portion 18C provided on the inner side. The portion of the flat surface portion 18B corresponding to the notch 21 formed around the upper edge is fitted into the notch 21 on the container body 11B side to increase the compressive strength of the container and to improve the airtightness in the container. The built-up portion 23 is provided to increase the temperature and maintain the cold insulation.

  The foamed synthetic resin container of the present embodiment can be manufactured using the same thermoplastic resin as the foamed synthetic resin container of the first embodiment described above and using the same in-mold foam molding method.

The foamed synthetic resin container of the present embodiment is similar to the foamed synthetic resin container of the first embodiment described above, and the bottom surface is flattened at the center of the two long sides of the bottom plate portion 12 of the bottom periphery of the container body 11B. Since the load receiving bottom surface extending portion 20 is provided to be grounded when placed on the container, food, ice pieces, etc. are accommodated in the container, and when this is stacked in multiple stages, the bottom container is the bottom raised portion 15. Since the bottom surface other than that and the load receiving bottom surface extension portion 20 are in contact with each other, deformation of the central portion of the side wall portion 13 that is easily deformed when a load is applied can be relaxed, and the compressive strength of the container can be increased. When a large load is applied, such as the lowest container in the case of multistage stacking with objects and ice, cracks are less likely to occur in the container and lid than in the conventional product.
As described above, the foamed synthetic resin container of the present embodiment is less prone to cracking than conventional products when a large load is applied, so that the airtightness in the container is maintained and the cold insulation is improved.
In addition, as described above, the foamed synthetic resin container according to the present embodiment is less likely to crack when compared with the conventional product when a large load is applied.
Moreover, since the foamed synthetic resin container of this embodiment is the structure which provided the load receiving bottom face extension part 20 in the bottom of the container main body 11B, it can raise the compressive strength of a container, without using members other than a foamed synthetic resin container. Therefore, the strength of the container can be improved without increasing the cost.

  FIGS. 5 and 6 are views showing a third embodiment of the foamed synthetic resin container of the present invention. FIG. 5A is a plan view of the container body 11C, and FIG. 5B is a partial cross-sectional view of the container body 11C. FIG. 6C is a bottom view of the container body 11C, FIG. 6A is a bottom view of the lid 17C, FIG. 6B is a side view of the lid 17C in partial cross section, and FIG. 6C is a lid 17C. FIG.

  The foamed synthetic resin container of this embodiment comprises a bottom plate portion 12 having a substantially rectangular shape and a side wall portion 13 erected from the periphery of the bottom plate portion 12, and is grounded when the bottom surface is placed on a flat surface at the periphery of the bottom surface. A foamed synthetic resin container main body 11C provided with a bottom raising portion 15 that is not provided, and a foamed synthetic resin lid 17C having substantially the same shape as the bottom plate part 12 that is detachably attached to the opening of the container main body 11C; It is composed of The foamed synthetic resin container of the present embodiment has a load receiving bottom surface extension portion 20 that is grounded when the bottom surface is placed on a flat surface on two long sides of the bottom plate portion 12 of the bottom surface periphery of the container body 11C. It is characterized in that it is provided at two places (total of four places) in the vicinity of the center.

  In the present embodiment, the upper end of the side wall 13 of the container body 11C is provided with a stepped portion comprising an upper edge convex portion 14a at the center in the thickness direction and upper edge notches 14b on both sides in the thickness direction, and A concave groove 18 into which the upper edge convex portion 14a is fitted is provided around the lower peripheral edge portion of the lid 17C. By covering and pressing the opening of the container main body 11B with the lid 17C, the upper edge convex portion 14a of the container main body 11C and the concave groove 18 of the lid 17C are fitted, and the lid 17C closes the opening of the container main body 11C. To be fitted.

  Further, in the upper edge convex portion 14a, at the positions corresponding to the total four load receiving bottom surface extending portions 20 provided on the bottom surface, when only the container main body 11C is stacked in multiple stages, the 4 provided on the bottom surface is provided. Four notches 21 are provided for fitting the load receiving bottom surface extensions 20 at the locations. By providing this notch 21, when only the container main body 11C is stacked in a multi-stage, a total of four load receiving bottom surface extensions 20 of the upper container main body 11C are fitted into the notch 21, respectively, and the upper container main body 11C The bottom raised portion 15 contacts the upper edge convex portion 14a of the lower container main body 11C, and the bottom main portion of the upper container main body 11C is located on the inner side of the upper edge convex portion 14a of the lower container main body 11C. Even when only the container main bodies 11C are stacked in a multi-stage, sufficient stackability is ensured, and the multi-stage stacked container main bodies 11C have a structure that does not easily collapse.

  In the present embodiment, the bottom surface of the container main body 11B is composed of a bottom main portion that is grounded when the container main body 11C is placed on a plane, a bottom raising portion 15 that is not grounded, and a length of the bottom plate portion 12. The load receiving bottom surface extending portion 20 is provided at the center portion of the two side sides and extends from the bottom main portion to the side edge. When the container main body 11C is placed on a flat surface, the bottom main part other than the bottom raising part 15 and the load receiving bottom extension 20 are installed.

  Also, the side wall 13 on the short side of the container main body 11C is provided with a handle notch 16 that becomes the handle when the remaining portion handles the container main body 11C, as in the case of the container main body 11A of the first embodiment. .

  In the present embodiment, the lid 17C shown in FIG. 6 has a thick plate shape substantially the same shape as the bottom plate portion 12 of the container body 11C.

  On the upper surface side of the lid 17C shown in FIG. 6 (c), when the foamed synthetic resin containers having the lid 17C attached to the container body 11C are stacked in multiple stages, irregularities corresponding to the bottom shape of the upper foamed synthetic resin container are formed. Is provided. That is, a convex part with which the bottom raising part 15 of the container main body 11C abuts is provided on the peripheral edge of the upper surface of the lid 17C, and portions corresponding to the four load receiving bottom surface extension parts 20 of the convex parts are formed in the notches 22, respectively. It has become. By providing irregularities corresponding to the bottom surface of the container main body 11C on the upper surface side of the lid 17C, when the foamed synthetic resin containers are stacked in multiple stages, the bottom main part and the bottom extension 20 of the upper container main body 11C are covered. When contacting the flat surface on the upper surface side of the 17C, the raised portion 15 of the upper container body 11C contacts the convex portion on the upper surface side of the lid 17C, and sufficient stackability is obtained when the foamed synthetic resin containers are stacked in multiple stages. Secured and multi-staged foamed synthetic resin containers have a structure that does not easily collapse.

  Further, a concave groove 18 is provided around the lower edge of the lid 17C so that when the lid 17C is attached to the container main body 11C, the upper edge convex portion 14a of the container main body 11C is fitted around the upper groove. The portion of the concave groove 18 corresponding to the notch 21 formed in the convex part 14a is fitted into the notch 21 on the container body 11C side, increasing the compression resistance of the container and enhancing the airtightness in the container, A built-up portion 23 is provided for maintaining cold insulation.

  The foamed synthetic resin container of the present embodiment can be manufactured using the same thermoplastic resin as the foamed synthetic resin container of the first embodiment described above and using the same in-mold foam molding method.

The foamed synthetic resin container of the present embodiment has a load receiving bottom surface extension portion 20 that is grounded when the bottom surface is placed on a flat surface on two long sides of the bottom plate portion 12 of the bottom surface periphery of the container body 11C. Since it is configured to be provided at two locations in the vicinity of the center, when the food or ice pieces are accommodated in the container and stacked in multiple stages, the lowermost container has a bottom surface other than the bottom raising portion 15. The load receiving bottom surface extension portion 20 is grounded, so that deformation of the central portion of the side wall portion 13 that is easily deformed when a load is applied can be reduced, and the compressive strength of the container can be increased. When a large load is applied, such as the lowest container when packed and stacked, the container and the lid are less likely to crack compared to the conventional product.
Further, as described above, the foamed synthetic resin container of the present embodiment is less prone to cracking when compared with the conventional product when a large load is applied, so that the airtightness in the container is maintained and the cold insulation property is improved. .
In addition, as described above, the foamed synthetic resin container according to the present embodiment is less likely to crack when compared with the conventional product when a large load is applied.
Moreover, since the foamed synthetic resin container of this embodiment is the structure which provided the load receiving bottom face extension part 20 in the bottom of the container main body 11C, it can raise the compressive strength of a container, without using members other than a foamed synthetic resin container. Therefore, the strength of the container can be improved without increasing the cost.

Each embodiment mentioned above is illustration of the present invention, and the present invention is not limited only to description of these embodiments, and various changes and modifications are possible.
For example, in each of the embodiments described above, the shape of the bottom surface of the container body and the shape of the lid are substantially rectangular. However, the shape is not limited to this, and may be other squares such as a square, a rhombus, and a parallelogram.
Also, the position where the load-receiving bottom surface extension is formed is not limited to the central part of the long side or the vicinity of the central part, but can be at least two opposite sides when the bottom surface is square, Even in the middle of the long side 2 and the short side 1 or 2 or in the vicinity of the center, or in the center or near the center of the short side 2 and the long side 0 to 1 A bottom extension may be formed.
Further, in each of the embodiments described above, a foamed synthetic resin container including a container body and a lid is illustrated, but a foamed synthetic resin container using a container body without a lid, or a non-foamed container body without a lid. The present invention can also be applied to a foamed synthetic resin container that covers a lid formed with a synthetic resin sheet.

[Example]
Expandable polystyrene resin particles (manufactured by Sekisui Plastics Kogyo Co., Ltd., trade name Eslen beads HDMF) are heated to produce pre-expanded particles with a bulk expansion ratio of 60 times. Filled in the cavity of a mold made by Kikai Seisakusho, trade name ACE-30QS), heated in steam and foam-molded in the mold, taken out after standing to cool, and removed from the container main body 11A shown in FIG. 1 and the lid shown in FIG. The foamed synthetic resin container (foaming multiple 60 times) of the example which consists of 17A was manufactured.
The obtained container main body 11A has a container outer dimension of 529 mm in length, a width of 322 mm, a height of 127 mm, an inner dimension of the container of 484 mm in length, a width of 274 mm, and a height of 110 mm. (Bottom raising amount) A bottom raising portion 15 having a width of 4 mm and a width of 28 mm, and a load receiving bottom surface extending portion 20 having a length of 100 mm (about 1/5 with respect to the long side length of the bottom plate portion) are provided at the center portion of the two long sides. .
The lid 17A had a length of 529 mm, a width of 322 mm, and a thickness of 29 mm.

[Comparative example]
Except that the load receiving bottom surface extension 20 is not provided on the bottom surface of the container body, the embodiment of the container body 1 and the lid 7 shown in FIG. A foamed synthetic resin container (foaming multiple 60 times) was produced.
The obtained container main body 1 has a length outside the container of 529 mm, a width of 322 mm, a height of 127 mm, a container inside dimensions of a length of 484 mm, a width of 274 mm, and a height of 110 mm. (Bottom raising amount) A bottom raising portion 15 having a width of 4 mm and a width of 28 mm was provided.
The lid 17A had a length of 529 mm, a width of 322 mm, and a thickness of 29 mm.

<Compressive strength test>
Prepare two foamed synthetic resin containers with a lid on the container body, stack them in two layers (height 284mm), sandwich them between two flat plates (upper flat plate, lower flat plate), and Tensilon Universal Testing Machine UCT Using -10T (manufactured by Orientec Co., Ltd.), compression was performed at a compression speed of 10 mm / min until the container broke. The relationship between the load (N) and the displacement (mm) was measured with the compression distance as the displacement. In addition, if the container body is empty and the lid is capped and the compression test is performed, the container will break faster than the actual use state where the contents entered the container due to the increase in the container internal pressure, A compression test was performed by providing one air vent hole with a diameter of 5 mm on the short side wall of each container body. Further, in order to make the measurement conditions the same in the example and the comparative example, the notch 22 on the upper surface side of the lid of the second-stage container of the example is filled with a foam of the same material as the lid, and the upper flat plate The compression test was conducted so that no gap was formed between the two.

The compression strength test was performed on the foamed synthetic resin container of the example and the foamed synthetic resin container of the comparative example, and the relationship between the load and the displacement amount was measured. The result is shown in FIG.
From the result of FIG. 14, the foamed synthetic resin container of the example showed an improvement in compressive strength of about 15% compared to the foamed synthetic resin container of the comparative example.

1 shows a first embodiment of a foamed synthetic resin container according to the present invention, in which (a) is a plan view of the container body, (b) is a side view of a part of the container body, and (c) is a bottom view of the container body. is there. 1 shows a first embodiment of a foamed synthetic resin container of the present invention, in which (a) is a bottom view of the lid, (b) is a side view of the lid in partial cross section, and (c) is a plan view of the lid. 2 shows a second embodiment of the foamed synthetic resin container of the present invention, wherein (a) is a plan view of the container body, (b) is a side view of a part of the container body, and (c) is a bottom view of the container body. is there. The 2nd Embodiment of the foaming synthetic resin container of this invention is shown, (a) is a bottom view of a lid | cover, (b) is the side view seen from the partial cross section of a lid | cover, (c) is a top view of a lid | cover. 3 shows a third embodiment of the foamed synthetic resin container of the present invention, wherein (a) is a plan view of the container body, (b) is a side view of the container body in partial cross section, and (c) is a bottom view of the container body. is there. FIG. 3 shows a third embodiment of the foamed synthetic resin container of the present invention, in which (a) is a bottom view of the lid, (b) is a side view of the lid in partial cross section, and (c) is a plan view of the lid. A conventional foaming synthetic resin container is shown, (a) is a top view of a container body, (b) is a side view of a part of the container body, and (c) is a bottom view of the container body. 1 shows a conventional foamed synthetic resin container, in which (a) is a bottom view of the lid, (b) is a side view of a portion of the lid, and (c) is a plan view of the lid. It is a side view which shows the state which piled up the conventional foaming synthetic resin container in multistage. It is side surface sectional drawing which shows roughly the load and the direction of a deformation | transformation in the conventional foamed synthetic resin container made into the multistage stack. It is a top view which shows roughly the deformation | transformation state of the side wall part at the time of the high load load in the conventional foaming synthetic resin container. It is a side view which shows the state which laminated | stacked the foamed synthetic resin container of this invention in multistage. It is side surface sectional drawing which shows roughly the load and the direction of a deformation | transformation in the foamed synthetic resin container of this invention made into multistage stack | stacking. It is a graph which shows the result of an Example.

Explanation of symbols

11A, 11B, 11C ... container body, 12 ... bottom plate part, 13 ... side wall part, 14a ... upper edge convex part, 14b ... upper edge part notch, 15 ... bottom raised part, 16 ... notch for handle, 17A, 17B, 17C DESCRIPTION OF SYMBOLS ... Lid, 18 ... Ditch | groove, 18B ... Plane part, 18C ... Protruding part, 20 ... Load receiving bottom extended part, 21 ... Notch, 22 ... Notch, 23 ... Overlaying part.

Claims (11)

In a foamed synthetic resin container comprising a bottom plate portion having a substantially rectangular shape and a side wall portion standing from the periphery of the bottom plate portion, and provided with a bottom raised portion that is not grounded when the bottom surface is placed on a flat surface at the periphery of the bottom surface. ,
A foam-synthesizing method characterized in that a load-receiving bottom surface extending portion that is grounded when the bottom surface is placed on a flat surface is provided at least in the central portion of the two sides facing the bottom plate portion or in the vicinity of the center among the peripheral edges of the bottom surface. Resin container.   2. The foamed synthetic resin according to claim 1, wherein the bottom plate portion has a substantially rectangular shape, and the load-receiving bottom surface extension portion is provided in a central portion or a central vicinity portion of two long sides of the bottom plate portion. container.   3. The foamed synthetic resin container according to claim 2, wherein a length of the load receiving bottom surface extension portion is within a range of 1/10 to 1/2 of a long side length of the bottom plate portion.   The position corresponding to the load receiving bottom surface extension at the upper end of the side wall is provided with a notch for fitting the load receiving bottom surface extension of the upper foamed synthetic resin container when the foamed synthetic resin containers are stacked in multiple stages. The foamed synthetic resin container according to any one of claims 1 to 3. Made of foamed synthetic resin, which consists of a bottom plate part that forms a substantially square shape and a side wall part that stands from the periphery of the bottom plate part, and a bottom raised part that is not grounded when the bottom surface is placed on a flat surface at the periphery of the bottom surface. In a foamed synthetic resin container comprising a container body and a foamed synthetic resin lid having substantially the same shape as the bottom plate portion detachably attached to the opening of the container body,
The container body is provided with a load receiving bottom surface extension portion that contacts the ground when the bottom surface is placed on a flat surface at least in the central portion or near the central portion of the two opposite sides of the bottom plate portion of the bottom surface periphery. Characteristic foamed synthetic resin container.   6. The container main body according to claim 5, wherein the bottom plate portion has a substantially rectangular shape, and the load receiving bottom surface extension portion is provided in a central portion or a central vicinity portion of two long sides of the bottom plate portion. The foamed synthetic resin container described.   The foamed synthetic resin container according to claim 6, wherein a length of the load receiving bottom surface extension portion is within a range of 1/10 to 1/2 of a long side length of the bottom plate portion.   The container body is provided with a notch that fits the load receiving bottom surface extension of the upper foamed synthetic resin container when the foamed synthetic resin containers are stacked in multiple stages at a position corresponding to the load receiving bottom surface extension at the upper end of the side wall. The foamed synthetic resin container according to claim 5, wherein the foamed synthetic resin container is formed.   The foamed synthetic resin container according to claim 8, wherein a built-up portion that fits into a notch provided on the container main body side is provided on a lower surface side of the lid.   The foamed synthetic resin container according to any one of claims 5 to 9, wherein the lid is provided with a notch at a position corresponding to the load receiving bottom surface extension on the upper surface side. At the upper end of the side wall of the container main body, an upper edge convex portion is provided in the center in the thickness direction, and a concave groove is provided in the lower surface peripheral portion of the lid to fit the upper edge convex portion. The foamed synthetic resin container according to any one of claims 5 to 10, wherein

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