JP6250352B2 - Logistics container - Google Patents

Description

  The present invention relates to a foamed resin distribution container suitable as a cold storage container for use in the distribution and storage of frozen foods, foodstuffs, and other commodities requiring cold storage.

  Conventionally, as a cold storage container for transport, storage, etc. of agricultural and marine products such as fresh fish, meat, fruits and vegetables, and frozen foods and foodstuffs that require cold storage, a flat rectangular container body opened upward, and at the opening end thereof A container made of foamed resin such as foamed polystyrene made of a lid to be fitted is used.

  Recently, due to the soaring of foamed resin raw materials such as foamed polystyrene, and the improvement of the logistics environment such as the development of cold cars, containers with a high doubled foam with a reduced amount of foamed resin used and containers with thin walls are used. It is increasing. However, the strength of the thin-walled container in which the amount of foamed resin used is reduced.

  For example, if the side wall is pulled during handling operations such as transportation and storage with the contents stored in such a container, especially when the cover is not covered, the upper end of the side wall may crack. is there. In such a case, it can no longer be used as a physical distribution container, and in the worst case, the contents must be discarded.

  From this point of view, as a distribution container made of foamed resin, it is also required to maintain a predetermined side wall strength while reducing the amount of foamed resin used.

  In order to solve such a problem, the inner surface of the central region of the side wall (the central region in the width direction) is formed into a corrugated shape with the vertical stripes and the convex stripes between the concave stripes. It has been proposed to secure side wall strength while reducing the amount used (Patent Document 1). In the case of this proposal, all the concave stripes in the wave shape have a length reaching from the upper end of the side wall to the lower end of the side wall.

  In the side wall side end portion near the corner portion of the side wall, the corner portion and its vicinity region can be relatively strong and have the necessary strength, but in the central portion of the side wall, the bending deformation increases with respect to the pulling in the side wall inside and outside direction, Cracks are also likely to occur. For this reason, when all of the ridges in the corrugated shape have the same length, the side wall strength cannot be sufficiently maintained, particularly in the central part of the side wall where the bending deformation increases.

Japanese Patent Application Laid-Open No. 2011-73689

  The present invention has been made in order to solve the above-mentioned problems, and is capable of achieving both strength retention and weight reduction of a container side wall, particularly a predetermined strength even in a central part of the side wall where bending deformation increases. Is to provide a foamed plastic distribution container.

  The present invention that solves the above-mentioned problems is a foamed resin logistics container comprising a container body that opens upward and a lid that can be fitted to the opening end of the container body, and the container body has four sides. The inner surface of the central region excluding the vicinity of the corner of the side wall of the side wall is formed with vertical grooves extending downward from the opening end at predetermined intervals in the circumferential direction of the container. A corrugated shape is formed between the convex portions, and the concave portion of the corrugated portion is short at the central portion of the side wall, and is gradually formed longer from the central portion of the side wall toward the side end portion.

  The physical distribution container of the present invention has a corrugated portion with concave and convex grooves in the vertical direction on the inner surface of the central region of the side wall of the container body, thereby reducing the amount of foamed resin to be used and making the side wall thinner. The weight of the container can be reduced. In addition, the up-and-down ridges can act as reinforcing ribs against the compressive load and bending load during stacking, and have the necessary side wall strength.

  In particular, in the case of the present invention, the concave streaks in the wavy portion are short in the concave portion in the side wall and are formed to be gradually longer from the central portion of the side wall toward the side end portion. In the central part of the side wall where the bending deformation becomes the largest in the case, the wall part of the original wall thickness remaining below the corrugated part is the highest, so that sufficient side wall strength is also obtained in the central part of the side wall. Can be retained, excessive bending deformation can be suppressed, cracks are less likely to occur, and durability can be enhanced.

In the physical distribution container, the ridges in the wave-shaped portion have a curved line in which the line connecting the lower ends of the ridges is high at the central portion of the side wall and gradually decreases from the central portion toward the side end portions. , it shall become varied continuously length. Thereby, the intensity | strength in a side wall does not change extremely and can suppress the stress concentration at the time of bending-deforming by the tension | pulling action of the side wall inside and outside.

In the above-mentioned physical distribution container, the height of the side wall is assumed to be constant.

  Further, in the above-described physical distribution container, the ridges and ridges in the wave-shaped portion may have a continuous wave shape forming a curved surface at a constant pitch in the circumferential direction of the container. On the other hand, stress concentration when a load or tensile force is applied can be prevented, and cracking of the side wall can be suppressed.

  Further, in the above-described physical distribution container, a plurality of planar hexagonal concave portions defined in a honeycomb shape by rounded rib-shaped convex portions may be provided on the upper surface and / or the lower surface of the bottom of the container body. . As a result, the bottom portion can be made thinner while securing the required strength by the rib-like convex portions, which can contribute to weight reduction of the container. In addition, because of the rounded rib-shaped protrusions with rounded corners, the contact of the contents is softened, the contents such as vegetables are not damaged, and the loss of the rib-shaped protrusions can be prevented. Moreover, since the raw material filling at the time of foam molding is performed smoothly, the processing defect rate can be reduced and the manufacturing cost can be reduced.

  As described above, according to the physical distribution container of the present invention, as a foamed resin container, the inner surface of the central region of the four side walls of the container body has a corrugated portion with vertical ridges and ridges. As a result, the side wall strength is not excessively lowered, and particularly sufficient strength can be maintained even in the central portion of the side wall where bending deformation becomes large, and the side wall can be thinned while maintaining the predetermined side wall strength, maintaining strength and reducing the weight of the container. Can be achieved. Therefore, the resin material can be saved as a distribution container, and the manufacturing cost can be reduced.

It is the perspective view which the container main body and lid which showed the Example of the physical distribution container of this invention isolate | separated. It is a top view of a container main body. It is a bottom view of a container main body. It is a top view of a lid. It is a bottom view of a lid. It is a half longitudinal section front view of a container main part and a lid. It is the perspective view seen from the state of the state which attached the cover body to the container main body. It is some longitudinal cross-sectional views same as the above. It is a partial expanded sectional view of an engaging part same as the above.

  Next, embodiments of the present invention will be described based on examples shown in the drawings.

  The container of this embodiment is a physical distribution container formed of a foamed resin such as expanded polystyrene as a raw material, and has a flat rectangular container body 10 that opens upward, and a lid 30 that can be attached to the container body 10. And more.

  The container main body 10 includes a bottom portion 11 and four side walls 12 and is provided so that a lid 30 is fitted and attached to an opening end portion 10a at the upper end portion of each side wall as will be described later. The inner surface of the central region 14 of each side wall 12 excluding the corner portion 13 and the side wall side end portion in the vicinity of the container main body 10 forms a concave shape with respect to the original inner surface of the side wall and extends downward from the opening end portion 10a. The extending vertical ridges 15 are formed at predetermined intervals in the circumferential direction of the container, thereby forming a wave shape by the concave ridges 15 and the ridges 16 left between the concave ridges 15, 15, The concave stripes 15 (and the convex stripes 16) in the wavy portion 14 are formed to be short at the central portion of the side wall (the central portion in the width direction) and gradually longer from the central portion of the side wall toward the side wall end near the corner portion. ing. That is, the concave strip 15 is formed below the corrugated portion 14a so that the wall surface portion 14b having the original thickness remains, and the height of the wall surface portion 14b from the container bottom is the side wall. It is higher than the side edge at the center.

  The concave strip 15 in the wave-shaped portion 14a can be changed in length stepwise from the central portion of the side wall to the side end portion by one or a plurality of strips (preferably 2-5 strips). However, in practice, as shown in the figure, the line connecting the lower ends of the recesses 15 is high at the central portion of the side wall and gradually becomes lower from the central portion toward the side end portion, preferably as shown in the figure. It is preferable to continuously change the length so that the side wall-side end slope has a smooth curved shape because stress concentration at the time of bending deformation of the side wall can be suppressed.

  The length of the recess 15 can be appropriately determined in consideration of the strength of the side wall including the central part of the side wall. In the case of the figure, the length of the concave part 15 is about 1/3 of the side wall height at the side wall central part, and the side wall height at the side end part. It has a corresponding length. Reference numeral 17 in the drawing denotes a corner vicinity region including the corner portion 13 and the side wall side end portion.

  The concave stripes 15 and the convex stripes 16 may have a wave shape with concave and convex sections having a square cross section, but as shown in the figure, a continuous sine having a curved surface with a constant pitch P in the circumferential direction of the container. It is preferably formed in a wave shape such as a waveform.

  In any case, the pitch P between the ridges 15 and the ridges 16 can be appropriately implemented, but the ridges 15 that are thinned between the ridges 16 and 16 when the package is taken in and out. It is good to set so that a space | interval of the grade which an operator's fingertip does not fit in can be hold | maintained, for example, said pitch so that the width | variety of the concave strip 15 between the said convex strips 16 and 16 may be 10 mm or less. P is preferably set to 20 mm or less. Further, the depth of the concave stripe 15 (that is, the height of the convex stripe) is set so as not to exceed 1/2 of the thickness of the side wall 12, and is set to, for example, 10 mm or less.

  The bottom surface 11b of the bottom portion 11 of the container body 10 has a cut-out step portion for stacking so that the side central region 18 of the lower surface 11b other than the corner vicinity region 17 is left as a grounding surface at the four corners in the peripheral portion. 19 is formed.

  In the notch step portion 19, the width W1a and W1b of the central region 14 of the side wall 12 whose inner surface forms a wave shape is the width W2a of the side central region 18 excluding the notch step portion 19 on the bottom lower surface 11b of the container body 10. , W2b, for example, the width W2a, W2b of the side central region 18 is the same as or slightly smaller than the width W2a, W2b of the side central region 18. By forming in this way, the stacking load can be received in the corner vicinity region 17 including the corner portion 13 and the side wall side end portion in the vicinity thereof at the time of stacking, and the bottom lower surface 11b of the side central region 18 is In combination with the ground contact surface, it is possible to avoid an excessively strong stacking load from acting on the wavy portion of the central region 14 of the side wall 12.

  In the case of the illustrated embodiment, the upper surface 11a of the bottom 11 of the container body 10 has a predetermined height such as a shape with a rounded cross section as shown in the figure, for example, a semicircular cross section or a square with rounded corners. A plurality of planar hexagonal concave portions 21 defined in a honeycomb shape are formed by the rounded rib-shaped convex portions 20 to form a honeycomb structure, and the rib-shaped convex portions 20 maintain a predetermined strength. However, the thickness of the concave portion 21 of the bottom 11 is made thinner than the original bottom so as to contribute to the weight reduction of the container. Each corner of the plane hexagon is also rounded. Since the rib-like convex portion 20 is rounded in this way, the contact with the rib-like convex portion when the contents are stored is softened, the contents such as vegetables are not damaged, and the rib-shaped convex portion 20 is not damaged. Can be prevented. In addition, since the raw material can be filled smoothly during foam molding, the defect rate can be reduced and the manufacturing cost can be reduced.

  Further, on the lower surface 11b of the bottom portion 11, a planar hexagonal concave portion 23 defined in a honeycomb shape by a rib-shaped convex portion 22 having a round cross-sectional shape as described above is formed on the upper surface 11a on the inner portion excluding the peripheral portion. Accordingly, the thickness of the bottom portion 11 can be reduced without reducing the strength of the bottom portion 11. The concave portion 21 or 23 may be provided only on one of the upper and lower surfaces 11a and 11b of the bottom portion 11. Further, other irregularities can be provided on the bottom upper surface 11a.

  The recesses 21 and / or 23 in the honeycomb structure vary depending on the type and size of the article to be packaged, but usually the distance between the parallel opposing sides in the recesses 21 and / or 23 is 70 mm or less, preferably 30 to 30 mm. The depth is set to 60 mm, and the depth of the recesses 21 and / or 23 is set to 10 mm or less, preferably around 5 mm. For example, the depth of the concave portion 21 on the upper surface is set to 5 mm, and the depth of the concave portion 23 on the lower surface 11b is set to about 3 mm. Reference numeral 24 in the figure indicates a notch for finger hooking when the attached lid 30 is opened.

  In addition, as a fitting and attaching structure of the lid 30 to the opening end 10 a of the container body 10, the peripheral portion 32 on the lower surface 31 b of the lid 30 is mounted on the upper end surface of the opening end 10 a of the container body 10. A fitting portion 34 is provided on the inner side of the container 33 while leaving the surface 33 on the outer peripheral portion. In order to fit the fitting portion 34 of the lid 30, a wave-shaped portion formed by the concave stripes 15 and the convex stripes 16 is notched at the upper end portion of the central region 14 of each side wall 12 of the container body 10. Thus, the fitting portion 34 is fitted into the cutout portion.

  At the corners of the four corners of the upper surface 31a of the lid body 30, a flat L-shaped stacking projection 35 for fitting with the notch step portion 19 of the bottom lower surface 11b of the container body 10 during stacking. Thus, stacking can be performed without causing positional displacement.

  The lid 30 may be provided only so that the fitting portion 34 fits inside the opening end portion 10a of the container body 10, but in the case of the illustrated embodiment, the opening end portion of the container body 10 is provided. 10a, the engaging convex portion 26 and the engaging concave portion that are elastically fitted and engaged with each other at the upper surface of the corner vicinity region 17 portion and the corresponding corner portion of the lower surface peripheral edge portion 32 of the lid 30. 36 is provided. The engaging convex part 26 and the engaging concave part 36 have a cross-sectional mushroom shape in which the engaging convex part 26 is enlarged on the projecting end side from the base part, and the corresponding engaging concave part 36 is wider toward the inside. It is desirable that the dovetail is formed so as not to be easily removed by forming it into a dovetail shape and elastically fitting it using the elasticity of the foamed resin. Reference numeral 37 in the figure is a convex portion that reinforces the lid 30, and in particular, extends obliquely from the annular portion at the center of the lower surface to the corner, and the corner of the lid 30 is hung with a finger. It is provided to prevent bending deformation and cracking during the opening operation.

  In the case of the illustrated embodiment, the fitting portion 34 in the lower peripheral edge portion 32 of the lid 30 is fitted inside the opening end portion 10a of the container body 10 as a fitting and attaching structure to the container body 10. Although examples have been shown, various other fitting forms such as a fitting structure with protruding ridges and grooves that fit each other, or a fitting structure that fits externally to the opening end, etc. Is possible.

  Examples of the foamed resin that is a constituent material of the container body 10 and the lid body 30 include styrene-modified polyolefin resin, polystyrene, high impact polystyrene, styrene-ethylene copolymer, styrene-maleic anhydride copolymer, styrene-acrylonitrile. Polystyrene resins such as copolymers, polyolefin resins such as polyethylene, polypropylene, and ethylene-vinyl acetate copolymers, and foams of various synthetic resins such as polyester resins such as polyethylene terephthalate can be used. Especially, the molded object by the bead foam of a styrene modified polyolefin resin is used suitably. The styrene-modified polyolefin resin is obtained by impregnating and polymerizing a polyolefin resin particle with a styrene monomer. Among the styrene-modified polyolefin resins, a styrene-modified polyethylene resin is preferable, for example, a styrene component The ratio is 40 to 90% by weight, preferably 50 to 85% by weight, more preferably 55 to 75% by weight. The foaming ratio of the foam is preferably 10 to 70 times.

  The molded product of the styrene-modified polyolefin resin bead foam is stronger than the molded product of the polypropylene resin beads having the same expansion ratio, and the shrinkage rate when a container having a depth exceeding 500 mm is molded. Low dimensional accuracy. Furthermore, there is an advantage that powder due to rubbing is less likely to be produced as compared with foamed molded products of styrene resin beads.

  The usage state of the physical distribution container of the above-described embodiment will be described. This distribution container is used for shipping and transporting frozen foods such as frozen shrimp, processed frozen foods and other agricultural products, marine products, etc., and the packaged goods are stored in the container body 10. In this state, the lid 30 is fitted and attached to the open end of the container body. When this container is stacked, the notch step portion 19 provided at the corner portion of the lower surface 11b of the bottom portion 11 of the container body 10 of the upper container is fitted into the fitting protrusion 35 provided at the upper corner portion of the lid body 30 of the lower container. Combine and position and stack.

  In this stacked state, most of the stacked load is received by the corner vicinity region 17 including the corner portion 13 and the side wall side end portion in the vicinity thereof, so that the central region 14 of the sidewall 12 whose inner surface forms a wave shape. No large stacking load or strong force will be applied.

  Moreover, the amount of foamed resin to be used can be reduced by having the corrugated portion 14a formed by the vertical ridges 15 and the ridges 16 on the inner surface of the central region 14 excluding the vicinity of the corner portion of the side wall 12 of the container body 10. This can reduce the thickness of the side wall and the weight of the container. In addition, the up-and-down ridges 16 can act as reinforcing ribs against the compressive load and bending load during stacking and have the necessary side wall strength.

  In particular, since the concave strip 15 in the wave-shaped portion 14a is short in the concave portion in the side wall and is formed to be gradually longer from the central portion of the side wall toward the side end portion, a tensile force in the inner and outer directions acts on the side wall 12. In the central portion of the side wall where the bending deformation becomes the largest in this case, the wall surface portion 14b having the original thickness remaining below the corrugated portion is the highest, so that sufficient side wall strength is obtained even in the central portion of the side wall. Can be retained, excessive bending deformation can be suppressed, cracks are less likely to occur, and durability can be enhanced.

  As described above, by adopting a structure capable of retaining a predetermined strength in the side wall 12 of the container body 10, the side wall can be thinned without reducing the side wall strength, thereby reducing the weight of the container, thereby reducing the amount of resin material and manufacturing cost. Can be reduced.

  DESCRIPTION OF SYMBOLS 10 ... Container main body, 10a ... Open end part, 11 ... Bottom part, 11a ... Upper surface, 11b ... Lower surface, 12 ... Four side walls, 13 ... Corner part, 14 ... Central part area, 14a ... Wave-shaped part, 14b ... Original Wall surface portion, 15 ... concave stripe, 16 ... convex stripe, 17 ... corner vicinity region, 18 ... side central region on bottom surface, 19 ... notch step portion, 20, 22 ... rib-like convex portion, 21, 23 ... concave part, 24 ... notch for hooking, 26 ... engaging convex part, 30 ... lid, 31a ... upper surface, 31b ... lower surface, 32 ... peripheral edge part, 33 ... mounting surface, 34 ... fitting part, 35 ... fitting Joint protrusion 36. Engaging recess 37. Reinforcing protrusion P Pitch W1a, W1b Side wall central region width W2a, W2b Bottom side central region width

Claims (3)

A physical distribution container made of a foamed resin comprising a container body that opens upward, and a lid that can be fitted to the opening end of the container body,
The inner surface of the central region excluding the vicinity of the corners of the four side walls of the container body is formed by forming vertical concaves extending downward from the opening end at predetermined intervals in the circumferential direction of the container. forms a wave shape by the projections between the concave and, concave of the corrugated portion is shorter in the side wall central portion, Ri Na is gradually elongated from side wall central portion toward the side edge,
The height of the side wall is constant,
The ridges in the wavy portion have a continuous length so that the line connecting the lower ends of the ridges is high in the central part of the side wall and gradually decreases from the central part toward the side end part. A logistics container characterized by being changed . 2. The physical distribution container according to claim 1 , wherein the corrugated portion and the corrugated portion in the corrugated portion have a continuous corrugated shape that forms a curved surface at a constant pitch in the circumferential direction of the container. The physical distribution container according to claim 1 or 2 , wherein a plurality of planar hexagonal concave portions defined in a honeycomb shape by rounded rib-like convex portions are provided on the upper surface and / or the lower surface of the bottom of the container main body.

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