JP5550887B2 - Foamed synthetic resin container - Google Patents

Description

  The present invention relates to a foamed synthetic resin container (hereinafter sometimes simply referred to as “container”) that accommodates seafood and the like. More specifically, the present invention relates to a container that can prevent the container from being broken even if it is stacked in multiple stages in a state in which seafood or the like is accommodated.

  The foamed synthetic resin container has been used very much as a transport container for accommodating fish and shellfish, vegetables and the like because of its good cold insulation and heat insulation performance and excellent buffer performance. The transport container is composed of a container body and a lid, and is often used by being stacked in multiple stages. In this case, in order to prevent the transport containers from being misaligned, a latching convex portion for preventing misalignment is provided at the bottom of the container body, and a latching convex portion for latching the convex portion is also provided on the lid. It is often done. An example is shown in FIGS.

  FIG. 14 is a front view in the case where conventional transport containers are stacked in three stages, FIG. 15 (a) is a front view of a container body of a conventional transport container, and FIG. It is a bottom view of the container main body of the conventional transport container. 18 and 19, reference numeral 42 denotes a container main body, 45 denotes a lid, 43 denotes a locking projection for preventing misalignment provided on the bottom surface of the main body, and 44 can lock the locking projection 43. The peripheral convex portion provided on the upper surface of the lid 45, 46 is a fitting convex provided on the upper side wall of the container body 42, and 48 is a fitting concave groove provided on the lower surface of the lid 45. Show.

  In the conventional transport container shown in FIGS. 14 and 15, the locking projection 43 is provided on the bottom surface of the container main body 42 on a plane at a position away from the peripheral edge thereof. The portion 43 has a function of preventing the lower lid body and the upper container body from being displaced by engaging with the peripheral convex portion 44 of the lid body 43 when the heat insulating containers are stacked. The fitting protrusion 46 provided on the upper side wall of the container body 42 is fitted to the fitting groove 48 provided on the lower surface portion of the lid 45 to fix the container body and the lid. , Has the function of sealing.

  However, the transport container containing seafood becomes heavier due to the contents such as fish, ice and water, and when such transport containers are stacked in multiple stages, the lower part of the lowermost container body 42 is destroyed. The problem that occurred.

  As a mechanism for causing the above problem, when conventional transport containers are stacked in multiple stages, the load concentrates on the peripheral edge of the lowermost container body, which prevents the peripheral edge from supporting the load. As a result, bending stress is generated on the side wall of the container main body 42 to cause the side wall to swell and eventually crack on the side surface. At the same time, the peripheral bottom of the container main body 42 It has been pointed out that a large shearing force acts on the rim, and eventually cracks occur at the bottom of the peripheral edge.

  As a technique for solving this problem, a locking projection provided on the bottom surface of the container body is provided only in the vicinity of, for example, the four corners, and the total load when the containers for transportation containing the contents are stacked in multiple stages. Technology that prevents the container body from being damaged by receiving the concentrated load on the peripheral edge of the container body in a large area on the bottom surface of the container body by being compressed (collapsed) and coplanar with the bottom surface of the container body Is known (Patent Document 1). Furthermore, in order to secure the ease of crushing of the locking projections, a technique for defining the size of the locking projections is also known (Patent Document 2).

  However, even if these techniques are applied, in a shipping container, when stacked in multiple stages, it may not be possible to prevent the lower part of the lowermost container body from being broken, and further, the bottom of the container body may be cracked. There has been a problem that the stability when the container is left standing in the case where the container is stored in a biased manner is generated.

Japanese Utility Model Publication No.59-38349 JP 2006-240726 A

  The present invention has been made in view of the above-described problems related to conventional transport containers, and an object of the present invention is to provide a transport container that does not damage the lowermost container body even when seafood and the like are accommodated and stacked in multiple stages. .

  As a result of earnest research on the problems of the conventional container, the present inventor, when stacking conventional transport containers in multiple stages, in addition to the mechanism, when the side wall swells, the bottom surface of the main body of the container itself bends upward. It has been found that the bulging is further promoted, and the present invention has been completed.

That is, the present invention
[1] In a foamed synthetic resin transport container having a rectangular parallelepiped shape composed of a foamed synthetic resin container body and a lid,
A central projection is provided at a substantially central portion of the bottom surface of the container body,
In addition, corner locking projections are provided near the four corners,
A container provided with a locking recess capable of locking the corner locking projection on the upper surface of the lid,
The maximum length M _L (mm) in the long side wall direction of the flat portion of the central projection satisfies the following formula (1), and the maximum length M _S (mm) in the short side wall direction is the following formula (2). Satisfied,
The height of the central portion projection Ri 3~5mm der, and
The foamed synthetic resin transport container, wherein the corner locking projection is crushed when a plurality of transport containers are stacked .
L _L × 0.15 ≦ M _L ≦ L _L × 0.8 (1)
L _S × 0.15 ≦ M _S ≦ L _S × 0.8 (2)
However, L _L is the length (mm) in the long side wall direction of the bottom surface of the container body, and L _S is the length (mm) in the short side wall direction of the bottom surface of the container body.
[2] The flat portion of the central protrusion provided at the substantially central portion of the bottom surface of the container body is
From the long side direction of the side wall bottom of the container body in the long side direction of the side wall _(L L × 0.1) or more inner position in which a gap D _L of, and the short-side direction of the side wall bottom to the short-side direction of the side wall (L _S ×, characterized in that provided inside the position spaced 0.1) of clearance D _S, foamed synthetic resin shipping container according to [1], and [3]該隅edge locking The length C _L (mm) in the long side wall direction of the protrusion satisfies the following formula (5), the length C _S (mm) in the short side wall direction satisfies the following formula (6),
The foamed synthetic resin transport container according to [1] or [2], wherein the height of the central projection is 3 to 5 mm.
C _L ≦ (L _L −2 × W _S ) × 0.15 (5)
C _S ≦ (L _S −2 × W _L ) × 0.25 (6)
However, L _L is the length (mm) in the long side wall direction of the bottom surface of the container body, L _S is the length (mm) in the short side wall direction of the bottom surface of the container body, and W _L is the long side wall direction of the container body. wall thickness (mm), W _S is available for a thickness of the short-side direction of the side wall of the side wall of the container body (mm).

  In the transport container of the present invention, when a plurality of transport containers are stacked by providing a central projection of a specific dimension at the substantially central portion of the bottom surface of the container body and corner locking projections near the four corners. In addition, it is possible not only to prevent breakage at the lower part of the lowermost container body, but also to prevent cracking of the bottom surface of the container body. Accordingly, even a container body made of a foamed synthetic resin having a low strength such as a high foaming ratio can be prevented from being broken, so that the weight can be reduced. In addition, even when the contents in the container are stored in an uneven manner, the stability when the container is allowed to stand can be improved.

(A) is a partially cutaway front view of the container main body of this invention, (b) is a partially cutaway side view. (A) is a top view of the container main body of this invention, (b) is a bottom view. (A) is a partially cutaway front view of the lid of the present invention, and (b) is a partially cutaway side view. (A) is a top view of the cover body of this invention, (b) is a bottom view. It is a perspective view which shows an example in the case of making the center part protrusion 13 fit in the latching recessed part 4. FIG. It is a front view which shows an example at the time of stacking | stacking the container for transport of this invention in 3 steps | paragraphs. It is a perspective view which shows an example in the case of fitting the fitting convex part 10 and the fitting recessed part 12. FIG. It is explanatory drawing of the mechanism by which destruction of the side wall bottom part of a container main body is prevented by the structure of this invention. (A) is a partially notched front view of the container main body of another aspect of this invention, (b) is a partially notched side view. (A) is a top view of the container main body of another aspect of this invention, (b) is a bottom view. (A) It is a fragmentary perspective view which shows an example of the container main body provided with the handle part, (b) is a fragmentary sectional view which shows the fitting part periphery of the container main body of (a). (A) is a perspective view of the container main body of another aspect of this invention, (b) is a perspective view which shows the bottom face of a container main body, (c) is the side surface of the container main body shown to (a). FIG. (A) is a top view of the upper surface of the cover body of another aspect of the present invention, (b) is a cross-sectional view of the cover body shown in (a), and (c) is shown in (a). It is a top view which shows the bottom face of the last lid. It is a front view at the time of stacking the conventional transportation container 3 steps | paragraphs. It is a front view of the container main body of the conventional transport container, (b) is a bottom view.

  Below, the container of this invention is demonstrated using drawing.

  1 to 4 show an embodiment of the foamed synthetic resin transport container of the present invention. 1 (a) is a partially cutaway front view of the container body, FIG. 1 (b) is a partially cutaway side view, FIG. 2 (a) is a plan view of the container body, (b) is a bottom view, and FIG. ) Is a partially cutaway front view of the lid, FIG. 4B is a partially cutaway side view, FIG. 4A is a plan view of the lid, and FIG. 4B is a bottom view. 1 (a) (b) and 2 (a) (b), 2 is a container body, 10 is a central projection, 12 is a corner locking projection, 4 is an inner surface of a side wall, 3a Denotes a side wall in the direction of the long side wall of the container body, 3b denotes a side wall in the direction of the short side wall of the container body, 6 denotes a fitting protrusion, and 7 denotes an inner surface of the fitting protrusion. Further, in FIGS. 3A and 3B and FIGS. 4A and 4B, reference numeral 5 denotes a lid body, and 13 denotes a latch that can lock a corner locking projection provided on the upper surface of the lid body 5. A stop recess, and 8 a fitting recess provided on the lower surface of the lid.

  The transport container of the present invention comprises a container body and a lid body made of foamed synthetic resin, and the shape thereof is a rectangular parallelepiped. However, the rectangular parallelepiped shape in the present specification is not limited to a strict rectangular parallelepiped shape, the shape of the cross section is slightly trapezoidal, the shape is slightly rhombus, and the ridgeline and corners of the transport container are rounded. It is meant to include those having a surface, those having an inclined surface, and those having a notch. However, it is preferable that the roundness, the inclined surface, the cutout, and the like at the ridge line portion on the bottom surface of the container body are as small as possible.

  The foamed synthetic resin transport container of the present invention is formed of a synthetic resin foam obtained by foaming a foamable synthetic resin by molding means such as in-mold molding. The foamed synthetic resin constituting the transport container is not particularly limited. For example, the foamed polystyrene resin, the foamed polyethylene resin, the foamed polyolefin resin such as the foamed polypropylene resin, or the polystyrene modified foam such as polystyrene modified foamed polyethylene. Polyolefin resins, rigid foamed urethane resins, and the like can be used. Among these, a polystyrene foam resin is preferable from the viewpoint of cost and the like.

  In the case of using a foamed polystyrene-based resin, the transportation container of the present invention preferably has a foaming ratio of 20-80 times, more preferably 30-70 times, most preferably 50-65 times as the foaming ratio of the container body and the lid. preferable. A transport container having an expansion ratio of 30 to 70 times of a heat insulating container made of a polystyrene-based resin expanded particle molded body is excellent in lightness, heat insulating property, and rigidity. In particular, the shipping container of 50 to 65 times is particularly excellent in lightness, and has sufficient rigidity as a shipping container.

  The container body 2 is open on one side and is composed of four side walls 3 and a bottom wall 9. In the case of a rectangular parallelepiped, the side wall 3 includes a pair of long side walls 3a and a pair of short side walls 3b. However, the bottom surface of the container body of the present invention is not necessarily rectangular, and may be square. When the bottom surface of the container body is not rectangular, the long side wall is read as a side wall parallel to the length direction of the contents, and the short side wall is read as a side wall substantially perpendicular to the length direction of the contents. .

  In the foamed synthetic resin transport container of the present invention, as shown in FIGS. 1 to 4, a central projection 10 is provided at a substantially central portion of the bottom surface of the container body 2 and corner locking projections 12 are provided near the four corners. The upper surface of the lid 5 is provided with a recess including a locking recess 13 that can lock the corner locking protrusion 12.

  Therefore, when the container body 2 and the lid body 5 are sequentially stacked, as shown in FIG. 5, the corner body locking projections 12 provided in the vicinity of the four corners are fitted into the locking recesses 13, whereby the container body 1 And the lower lid 2 can be prevented from being misaligned and can be stacked firmly. In addition, in FIG. 6, an example at the time of stacking | stacking the container for transport of this invention in three steps is shown.

  The lid body 5 has a function of sealing the inside of the container body 2. As shown in FIG. 7, the fitting protrusion 6 of the container body 1 is fitted in the fitting groove 8 provided on the lower surface of the lid body 5. The container body 2 and the lid body 51 can be satisfactorily closed in a substantially airtight manner. The inner surface 7 of the fitting ridge 6 and the inner surface 4 of the container body 2 may be formed as a single plane as shown in FIG. A part may be provided. In the drawing, an example is shown in which the fitting protrusion 6 is provided on the container body 2 side and the fitting groove 8 is provided on the lid body 5 side. However, if the fitting is good, the fitting groove 8 is provided on the container body 2 side. It is also possible to provide the fitting protrusion 6 on the lid 3 side.

  Further, in the vicinity of the four corners on the upper surface of the lid 5, as described above, the locking recesses 13 for locking with the corner locking protrusions 12 of the container body are provided. As the locking recesses on the upper surface of the lid 5, the locking recesses 13 for locking with the corner locking protrusions 12 of the container body 2 as described above may be provided in the vicinity of the four corners of the upper surface of the lid 5. It is preferable that the portions other than the locking recesses on the upper surface be recessed so as not to cause a decrease in strength by leaving the periphery 14 because this leads to saving of materials and weight reduction.

Moreover, it is preferable to form the part 16 inside the fitting recessed part 12 of the lower surface of the cover body 5 in a recessed shape because it leads to saving of material and weight reduction.
The planar shape of the flat portion of the central projection in the present invention may be a polygonal shape such as a substantially circular shape, a substantially elliptical shape, a substantially triangular shape, a substantially quadrangular shape, a substantially pentagonal shape or a substantially hexagonal shape, or any other suitable shape. There is no particular limitation.

In the present invention, the maximum length M _L (mm) in the long side wall direction of the flat portion 10F of the central protrusion 10 needs to satisfy the following formula (1), and the maximum length M _S (in the short side wall direction) mm) must satisfy the following formula (2).
L _L × 0.15 ≦ M _L ≦ L _L × 0.8 (1)
L _S × 0.15 ≦ M _S ≦ L _S × 0.8 (2)
However, L _L is the long-side side wall length of the bottom surface of the container main body 2 (mm), L _S is the short side direction of the side wall of the length of the bottom surface of the container body 1 (mm).

  When the above formulas (1) and (2) are satisfied, even if the transport containers containing seafood and the like are stacked in multiple stages, the accumulated pressure strength of the lowermost container body 2 can be increased. It is possible to make it difficult to damage the side wall and the peripheral bottom. That is, an impact such as vibration is applied during the work of loading the heat insulating containers stacked in multiple stages or during truck transportation, so that a large amount of load concentrates on the peripheral edge of the lowermost container body 1 and the central part of the bottom surface Even in the case of bending upward, as shown in FIG. 8, the central projection of the present invention absorbs the bending of the bottom surface and bottoms on the floor 22 over a wide range of the bottom surface of the container body. The concentrated load applied to the peripheral portion of the container can be received by a wide area of the bottom surface of the container body. In addition, the presence of the central protrusion can facilitate the crushing of the corner locking protrusion, and promote the bottoming of the floor at the peripheral edge of the bottom surface of the container body. Therefore, the load can be dispersed, bending stress and shear stress generated at the peripheral edge can be relaxed, and damage to the container body 2 can be prevented.

In order to further increase the accumulated pressure strength of the container body 2, the maximum length M _L (mm) in the long side wall direction preferably satisfies the following expression (3), and the short side wall direction has a short side wall direction. The maximum length M _S (mm) preferably satisfies the following (4).
L _L × 0.2 ≦ M _L ≦ L _L × 0.7 (3)
L _S × 0.2 ≦ M _S ≦ L _S × 0.7 (4)

In this specification, as shown in FIG. 1 (a) (b), and the maximum length M _L of the long side direction of the side wall of the flat portion 10F of the central projection 10, while the short sides the side walls of the container body 2 It means the length of a straight line that connects a point closest to the end in the direction and a point farthest from the end in the side wall direction in the horizontal direction. Further, the maximum length M _S of the short side direction of the side wall of the flat portion 10F of the central projection 10, most nearest point and long side direction of the side wall end part on one long side direction of the side wall end of the container main body 2 This is the length of a straight line that connects distant locations in the horizontal direction.

In the transport container of the present invention, by providing the central projection 10, the bottom crack strength of the bottom surface of the container body can be improved.
Note that the bottom crack strength means that the container body 2 is stacked in two stages so that the opening is on the upper surface, and a 70 mmφ jig is pressed at a speed of 200 mm / min on the center of the bottom surface of the uppermost container body. It is a value obtained by measuring the maximum strength at the time of destruction.

  In the transport container of the present invention, by providing the central projection 10, the container is allowed to stand even when the stored items are biased in the container as compared with the case where only the corner locking projection is provided. Stability can also be improved.

  The height of the central projection 10 of the container main body is preferably 1 to 10 mm, and more preferably 2 to 5 mm from the viewpoint of preventing lateral deviation when stacking containers. The height is appropriately determined within the above range depending on the material of the container body and / or the lid and the expansion ratio. If the height is low, there is a tendency that the effect of preventing lateral deviation when stacking containers cannot be exhibited. If the height is high, stress is concentrated on the side wall when a load is applied, and the side wall tends to expand outward. Tends to increase and the accumulated pressure strength tends to decrease.

In the transport container of the present invention, for example, the long side wall direction length L _L of the bottom surface of the container main body is usually 300 to 750 mm, the short side wall direction length L _S is usually 200 to 400 mm, and the side wall direction in the long side wall direction. The thickness W _L is usually 10 to 30 mm, and the thickness W _S of the side wall in the short side wall direction is usually 10 to 30 mm. In particular, even in a transport container having a large bottom surface with L _L of 500 to 750 mm and L _S of 300 to 400 mm, even when a plurality of transport containers are stacked by providing a central projection, the lowest container Damage to the main body can be prevented.

In the present invention, the flat portion 10F of the central projection 10 provided at the approximate center of the bottom surface is formed from the bottom side in the long side wall direction to the long side wall direction of the container body, as shown in FIGS. (L _L × 0.1) or more inside the gap D _L , and the inner side with a gap D _S of (L _S × 0.1) or more from the bottom side in the short side wall direction to the short side wall direction preferably provided in a position further from the long-side direction of the side wall bottom of the container body in the longitudinal direction of the side wall _(L L × 0.15) or more inner position in which a gap D _L of, and short-side side walls it is more preferably provided on the inner position spaced from the direction bottom to the short side direction of the side wall of the (L _S × 0.15) of clearance D _S. By providing a central protrusion at the above position, when multiple transport containers are stacked and concentrated load is applied to the peripheral edge of the lowermost container body, the bottom of the container body is easily bottomed and efficient. In addition, it is possible to prevent the lowermost container body from being damaged.

  9-10, the center part protrusion in this invention may have the peripheral edge 10I which has the inclination which goes to a bottom face gently from the flat part 10F, and has the peripheral edge 10I. It does not have to be. However, when containers are transported on a roller conveyor used for landing, etc., the protrusions are prevented from getting stuck between the rollers, or the vibrations that occur when the protrusions collide with the conveyor are suppressed. From the viewpoint of preventing the container from falling from the roller conveyor, it is preferable to have the peripheral edge 10I.

When the central projection 10 in the present invention has a peripheral edge 10I, the outermost part of the peripheral edge 10I has a gap _DRL of (1.1 × W _S ) or more from the bottom side in the short side wall direction to the long side wall direction of the container body 2. spaced inner positions, and is more preferably provided on the inner position spaced a short-side side wall direction W _L of clearance D _RS from the long side direction of the side wall bottom, further short-side direction of the side wall of the container body An inner position with a gap _DRL of (1.1 × W _S ) or more from the bottom side to the long side wall direction, and (1.1 × W _L ) or more from the bottom side of the long side wall direction to the short side wall direction it is more preferably provided at a position of the inner side a gap D _RS. That is, the peripheral edge 10I of the central projection 10 is inward by W _S (a) [W _S (a) ≧ 0.1 × W _S ] from the inner surface of the side wall 3b in the short side wall direction of the container body 2. And it is preferable to be provided inside the inner side surface of the side wall 3a in the long side wall direction of the container body 2, and from the inner side surface of the side wall 3b in the short side wall direction of the container main body by W _S (a), Moreover, it is more preferable that W _L (a) [W _L (a) ≧ 0.1 × W _L ] is provided on the inner side of the side wall 3a in the long side wall direction of the container body.

  In the vicinity of the four corners of the bottom surface of the container body 2 of the present invention, the corner locking projections 12 that can be locked with the locking recesses 13 of the lid 5 to prevent the container body 2 and the lower lid 5 from being displaced. Is provided.

  However, when the plurality of transport containers are stacked, the corner locking projections need to be crushed so that they can be attached to the floor 22 over a wide range of the bottom surface of the container body.

In the present invention, the maximum length C _L (mm) in the long side wall direction of the corner locking projection 12 needs to satisfy the following formula (5), and the maximum length C _S (mm in the short side wall direction: ) Must satisfy the following formula (6).
C _L ≦ (L _L −2 × W _S ) × 0.15 (5)
C _S ≦ (L _S −2 × W _L ) × 0.25 (6)
However, L _L is the base of the container body 2 long-side side wall direction length (mm), L _S is short-side side wall length of the bottom surface of the container main body 2 (mm), W _L is the long side side wall of the container main body 2 the thickness of the direction of the side wall 3a (mm), _{W S} is the thickness of the side wall 3b of the short-side direction of the side wall of the container body 2 (mm). Note that “2 × W _S ” in the equation (5) is based on the premise that the thickness of the left and right side walls 3b in the short side wall direction is the same, and when the thickness of the left and right side walls 3b is different, It is not “2 × W _S ” but the sum of the thicknesses of the left and right side walls 3b. The same applies to “2 × W _L ” in equation (6).

If the _{C L} is greater than _{(L L -2 × W S)} × 0.15, and / or, if the _{M S} exceeds _{(L S -2 × W L)} × 0.25 is the corner section engaging The stop protrusion 12 is not crushed as intended, the area per bottom of the bottom surface of the container body cannot be increased, and the effect of preventing the damage to the container body 2 by the above mechanism becomes insufficient.

In the present invention, each of the corner locking projections 12 provided in the vicinity of the four corners of the bottom surface, as illustrated in FIG. more that are provided in 1 × W _S) or more positions inside with a gap D _CL, and an inner position spaced W _L of clearance D _CS in the short side direction of the side wall from the long-side direction of the side wall bottom Preferably, the inner position of the container body with a gap D _CL of (1.1 × W _S ) or more from the bottom side in the short side wall direction to the long side wall direction, and from the bottom side in the long side side wall direction to the short side wall direction ( 1.1 × W _L ) or more is more preferably provided at an inner position with a gap D _CS therebetween. That is, as shown in FIGS. 13 and 14, the corner locking projection 12 is formed from the inner side surface of the side wall 3 b in the short side wall direction of the container body by W _S (a) [W _S (a) ≧ 0.1 × W _S ] is preferably provided on the inner side and on the inner side of the side wall 3a in the long side wall direction of the container body, and from the inner side surface of the side wall 3b in the short side wall direction of the container body, Ws (a) More preferably, it is provided on the inner side, and on the inner side by W _L (a) [W _L (a) ≧ 0.1 × W _L ] from the inner side surface of the side wall 3a in the direction of the long side wall of the container body. By providing the corner locking projections 12 at the above positions, when the plurality of transport containers are stacked and the concentrated load is applied to the peripheral edge of the lowermost container body, the bottom of the container body can be easily bottomed. It is possible to efficiently prevent the lowermost container body from being damaged.

  In the container main body 2 of the present invention, as shown in FIG. 11, it is preferable that the concave handle portion 27 is formed at the outer lower central portion of the side wall 3 b in the direction of the short side wall facing the container main body 1. When the handle portion 27 is provided, it is easy to carry the heat insulating container even when the seafood is stored. Further, in the side wall 3b of the portion where the handle portion 27 is provided, the thickness T of the upper side wall of the portion where the handle portion 27 is provided is formed thicker than the left and right portions of the handle portion 27. It is preferable. Thereby, the strength of the side wall 3b in the short side wall direction of the container body 2 is ensured.

  In the container body 2 of the present invention, as shown in FIGS. 1 (a) and 1 (b), when several stages of containers are stacked at the four corners of the side wall, the drainage from the container bodies stacked above is passed. The through hole 18 may be provided so as to penetrate vertically. In this case, it is preferable to provide through holes 18 at the four corners of the lid as shown in FIGS. Moreover, you may provide the groove | channel etc. for flowing down waste_water | drain on the outer surface of a side wall instead of a through-hole.

  As another aspect of the transport container of the present invention, a container body and a lid shown in FIGS. 12 and 13 can be exemplified.

  Examples of the container of the present invention will be described below. However, the present invention is not limited to the examples.

  With respect to the obtained container, the accumulated pressure strength and the bottom crack strength at the bottom were measured by the following methods.

(Accumulated pressure strength)
Using a compression tester (Minebea, universal compression tester TG-50KN), place one container fitted with a lid on the container body horizontally and cover the top of the container with a length of 650 mm and a width of 400 mm. X A steel plate having a thickness of 15 mm was placed and pressed in the vertical direction at a compression speed of 3 mm / min until the container broke, and the maximum load at the time of breaking the container body was defined as the accumulated pressure strength.

(Bottom crack strength)
Using a compression tester (Minebea, universal compression tester TG-50KN), the container body 2 is stacked in two stages so that the opening is on the top surface, and a 70 mmφ jig is placed in the center of the bottom surface of the uppermost container body. Was pressed at a speed of 200 mm / min until the bottom surface of the container body was broken, and the maximum load at the time of breaking the bottom surface of the container body was defined as the bottom crack strength.

Example 1
Expandable polystyrene resin particles [manufactured by Kaneka Corp., Kanepal NSGMB] were pre-expanded using a pre-foaming machine with a bulk expansion ratio of 62 times, and by in-mold molding, the expansion ratio was 60 times. A rectangular parallelepiped transport container comprising a container body and a lid was manufactured.
The obtained container main body has the shape shown in FIG. 9, and the lid has the shape shown in FIG. The outer dimensions of the container are 586 mm in length, 356 mm in width, 115 mm in height, 23 mm in thickness on the long side wall, 23 mm in thickness on the short side wall, and 20 mm in thickness on the bottom of the container. ^{2 having} an elliptical shape with a slope that gradually slopes toward the bottom surface (maximum length M _L = 149 mm in the long-side sidewall direction of the flat portion, maximum length M in the short-side sidewall direction of the flat portion _S = 100 mm, gap D _L = 218.5 mm in the long side wall direction of the flat part, gap Ds = 128 mm in the short side wall direction of the flat part, gap D _RL in the long side wall direction of the outermost part of the peripheral part 152 mm, gap D _RS = 62 mm, height 4 mm in the direction of the short side wall at the outermost part of the periphery)
Further, in the vicinity of the four corners of the bottom surface, a substantially triangular corner locking projection (maximum length C _L = 35 mm in the long side wall direction of the corner locking projection, the short side wall direction of the corner locking projection) A maximum length C _S = 35 mm, a gap D _CL = 26 mm in the longest side wall direction at the outermost part of the peripheral part, and a gap D _CS = 26 mm in a short side wall direction at the outermost part of the peripheral part).
The lower surface of the lid body is provided with a fitting concave groove for fitting with the fitting protrusion of the container at the peripheral portion, and the upper surface is provided with a locking concave portion for locking with the four corner locking protrusions of the container body. The peripheral edge is provided with a convex edge.
The resulting container for transportation had a cumulative pressure strength of 511 kgf and a bottom crack strength of 32.9 kgf.

(Comparative Example 1)
A rectangular parallelepiped transport container comprising a container body and a lid was manufactured by the same material, molding equipment, and manufacturing conditions as in Example 1 except that the central projection was removed from the container body.
The resulting container for transportation had an accumulated pressure strength of 490 kgf and a bottom crack strength of 29.4 kgf.

DESCRIPTION OF SYMBOLS 1 Foam synthetic resin container 2 Container main body 3 Side wall of container main body 3a Side wall of container main body in side of long side 3b Side wall of container main body in side of short side 4 Inner surface of side wall of main body of container 5 Lid body 6 Fitting ridge 7 Fitting Inner surface of mating strip 8 Fitting groove 9 Bottom surface of container body 10 Center projection 10F Flat portion of center projection 10I Periphery of center projection 12 Corner locking projection 13 Locking recess corresponding to corner locking projection 14 Around the upper surface of the lid body 16 Inside the fitting recess 12 on the lower surface of the lid body 18 Drain through hole 19 Rounded ridge 22 Floor 27 Concave recess 41 Container body of conventional container 45 Cover body of conventional container 43 Conventional container corner locking projection 44 Conventional container locking recess 46 Conventional container fitting protrusion 48 Conventional container fitting recess

Claims (3)

In a container made of foamed synthetic resin made of foamed synthetic resin, which is a rectangular parallelepiped shape made of a foamed synthetic resin container body and a lid,
A central projection is provided at a substantially central portion of the bottom surface of the container body,
In addition, corner locking projections are provided near the four corners,
A container provided with a locking recess capable of locking the corner locking projection on the upper surface of the lid,
The maximum length M _L (mm) in the long side wall direction of the flat portion of the central projection satisfies the following formula (1), and the maximum length M _S (mm) in the short side wall direction is the following formula (2). satisfied, the height of the central portion projection Ri 3~5mm der, and
The foamed synthetic resin transport container, wherein the corner locking projection is crushed when a plurality of transport containers are stacked .
L _L × 0.15 ≦ M _L ≦ L _L × 0.8 (1)
L _S × 0.15 ≦ M _S ≦ L _S × 0.8 (2)
However, L _L is the length direction of the side wall of the length of the bottom surface of the container body (mm), L _S is the short side wall direction of the bottom surface of the container body length (mm). The flat portion of the central projection provided at the substantially central portion of the bottom surface of the container body is
From the long side wall direction bottom of the container body in the longitudinal direction of the side wall _(L L × 0.1) or more inner position in which a gap D _L of, and the short side wall direction bottom to the short side wall direction (L _S × 0.1 ) or more, characterized in that provided at a position of the inner side a gap D _S, foamed synthetic resin shipping container of claim 1. The length C _L (mm) in the long side wall direction of the locking projection satisfies the following formula (5), and the length C _S (mm) in the short side wall direction satisfies the following formula (6):
The height of the central protrusion is 3 to 5 mm,
3. The foamed synthetic resin transport container according to claim 1, wherein a locking recess capable of locking the corner locking projection is provided on an upper surface of the lid.
C _L ≦ (L _L −2 × W _S ) × 0.15 (5)
C _S ≦ (L _S −2 × W _L ) × 0.25 (6)
However, L _L is the length (mm) in the long side wall direction of the bottom surface of the container body, L _S is the length (mm) in the short side wall direction of the bottom surface of the container body, and W _L is the length in the long side wall direction of the container body. the thickness of the side wall (mm), W _S is the thickness of the short side wall direction of the side wall of the container body (mm).

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