Buffer sheet and transport container

Abstract

Provided is a buffer sheet having excellent attachment to a facing portion of a container main body and having a small number of components. A buffer sheet that can be attached to a container main body, the container main body being a container main body of a transport container, the container main body having an opposing portion and a plurality of recessed portions, the opposing portion facing a first direction orthogonal to a bottom portion and outside the container main body, the plurality of recessed portions being recessed with respect to the opposing portion, the buffer sheet having: a sheet portion having a plurality of recessed portions; a sheet part which is provided so as to cover at least a part of the facing part, has a first surface facing the first direction and a second surface facing the facing part side, and is configured from an elastic body; and a projection group which is provided so as to project from the second surface, is configured from a plurality of projections integrally molded with the sheet part, and can be inserted in correspondence with the plurality of recesses.

Description

Technical Field

[0001] This invention relates to buffer sheets and conveying containers. Background Technology

[0002] As a material that can be used as an impact-absorbing material in the logistics field, the rubber-like sheet-cured material described in Patent Document 1 is known.

[0003] Existing technical documents

[0004] Invention Patent Documents

[0005] Invention Patent Document 1: International Publication No. 2017 / 154660 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] When conveying resin containers using a roller conveyor with multiple metal rollers, noise is generated due to interference between the rollers and the container. In particular, the noise caused by roller interference is amplified at the connection point between an inclined conveyor (whose vertical position decreases as it moves downstream in the conveying direction) and a horizontal conveyor (located downstream of the inclined conveyor and having a horizontal conveying surface). This noise is unpleasant for workers operating around the conveyor. To reduce this noise, buffer plates are installed on the container to minimize noise caused by roller interference. The buffer plates for the container must be easy to position relative to and remove from the container; that is, they must have excellent installability. Furthermore, there are concerns about increased costs and inconsistent quality due to assembly inconsistencies, such as increased assembly accuracy, when assembling the bolts and other fastening components for mounting the buffer plates. Therefore, the buffer plates for the container must have a small number of components.

[0008] The purpose of this disclosure is to provide a buffer sheet that has excellent installability relative to the container body and has a small number of parts.

[0009] Methods for solving problems

[0010] This disclosure is in the form of a buffer sheet that can be mounted on a container body, the container body being a conveying container and having an opposing portion and a plurality of recesses, the opposing portion facing a first direction orthogonal to the bottom and serving as the outer side of the container body, the plurality of recesses being recessed relative to the opposing portion, the buffer sheet having:

[0011] A sheet portion, the sheet portion being disposed such that it covers at least a portion of the opposing portions, and having a first surface facing the first direction and a second surface facing the opposing portions, the sheet portion being made of an elastomer; and

[0012] A protrusion group, which is provided to protrude from the second surface, is composed of a plurality of protrusions integrally formed with the sheet portion, and the protrusion group can be inserted into the plurality of recesses.

[0013] The effects of the invention

[0014] According to this disclosure, a buffer sheet with excellent installability relative to the container body and a small number of parts can be provided. Attached Figure Description

[0015] Figure 1 This is a perspective view of the conveying container and conveyor group according to the implementation method.

[0016] Figure 2 This is a side view of the conveying container and conveyor group according to the implementation method.

[0017] Figure 3 This is a perspective view of the delivery container in the implementation method.

[0018] Figure 4 This is a top view of the conveying container as seen from the bottom side.

[0019] Figure 5 This is a top view of the container body of the embodiment, viewed from the bottom side.

[0020] Figure 6 This is a perspective view of the corner of the opposing portion of the container body in the embodiment.

[0021] Figure 7 This is a perspective view of the buffer sheet in the implementation method.

[0022] Figure 8 This is a side enlarged view of the conveyor container and conveyor group in a comparative manner.

[0023] Figure 9 This is a perspective view of a modified example of the buffer sheet in the embodiment.

[0024] Figure 10 This is a top view of a modified example of the conveying container of the embodiment, viewed from the bottom side.

[0025] Figure 11 This is a top view of a modified example of the conveying container of the embodiment, viewed from the bottom side.

[0026] Figure 12 This is a top view of a modified example of the conveying container of the embodiment, viewed from the bottom side.

[0027] Figure 13 This is a top view of a modified example of the conveying container of the embodiment, viewed from the bottom side.

[0028] Figure 14A This is a table showing the specifications of the buffer sheets used in the various embodiments being evaluated, as well as the evaluation results for each embodiment. Figure 14B This is a graph representing the noise evaluation results in each embodiment.

[0029] Symbol Explanation

[0030] 10 Conveyor group, 11 First conveyor, 13 First roller, 16 Second conveyor, 18 Second roller, 20 Conveying container, 21 Container body, 21a Opening, 22 Side wall, 23 Bottom, 23a Facing section, 23b Corner, 24 Reinforcing rib group, 25 First rib group, 25a Rib group corner, 26 Outer frame rib, 27 Inner frame rib, 28 Separating rib (an example of a separating section), 29 First grid (an example of a recess), 29a Corner Grid, 31 Second rib group, 32 First inclined rib, 33 Second inclined rib, 34 Intersection, 35 Intersecting rib group, 36 Second grid (an example of a recess), 40 Buffer sheet, 50 Sheet section, 50a First surface, 50b Second surface, 51 Sheet edge, 52 First end, 54 Second end, 56 Sheet corner, 58 Sheet center, 60 Protrusion group, 70 First protrusion, 80 Second protrusion, 90 Third protrusion, 100 Fourth protrusion. Detailed Implementation

[0031] The embodiments involved in this disclosure will now be described with reference to the accompanying drawings. The scale of the drawings may not be accurate, and some local features may be exaggerated or omitted.

[0032] In the following description, a direction along the horizontal direction is defined as the +U direction. A direction extending along the axis of the +U direction is defined as the U direction. A direction along the horizontal direction and orthogonal to the U direction is defined as the V direction.

[0033] In the rectangular bottom surface of the conveying container, the direction along one edge is defined as the X direction. A direction along the X direction is defined as the +X direction. The direction opposite to the +X direction is defined as the -X direction. The direction along the rectangular bottom surface of the conveying container and orthogonal to the X direction is defined as the Y direction. A direction along the Y direction is defined as the +Y direction. The direction opposite to the +Y direction is defined as the -Y direction. The direction relative to the bottom of the conveying container towards the conveyor side is defined as the -Z direction. The direction opposite to the -Z direction is defined as the +Z direction.

[0034] like Figure 1As shown, the conveying container 20 according to the embodiments of this disclosure can be conveyed by a conveyor group 10. The conveyor group 10 is used, for example, in a logistics warehouse. The conveyor group 10 of the embodiments has a first conveyor 11 and a second conveyor 16.

[0035] The first conveyor 11 is a fixed roller conveyor having a first conveying surface 12 along a horizontal direction. The first conveying surface 12 is an imaginary plane extending in the U direction. The first conveyor 11 is capable of conveying a conveying container 20 placed on the first conveying surface 12 in the +U direction along the first conveying surface 12. The first conveyor 11 has a plurality of first rollers 13.

[0036] The first roller 13 is a cylindrical shape extending in the V direction (see...). Figure 2 The first roller 13 is made of metal. The first roller 13 has a support shaft (not shown). The support shaft of the first roller 13 is along its central axis. The support shaft of the first roller 13 is rotatably supported on the support frame of the first conveyor 11. A plurality of first rollers 13 are arranged side-by-side in the U direction with a predetermined spacing length P. The spacing length P is the distance between the support shafts of two adjacent first rollers 13. That is, the first conveying surface 12 extends in the arrangement direction of the plurality of first rollers 13 and is imaginarily formed along a tangent that is tangent to the vertical side of the plurality of first rollers 13.

[0037] It should be noted that the plurality of first rollers 13 are each configured as rollers with unavoidable positional offset in the vertical direction relative to the first conveying surface 12, such as assembly tolerances.

[0038] The second conveyor 16 is a fixed roller conveyor with a second conveying surface 17. For example... Figure 1 As shown, the second conveying surface 17 is an imaginary plane that is inclined in a manner such that the UV plane extending in the U direction decreases in position in the vertical direction as it moves towards the +U direction. The second conveying surface 16 is capable of conveying the conveying container 20 placed on the second conveying surface 17 along the second conveying surface 17 in the +U direction and in a direction inclined downward in the vertical direction. The two ends of the second conveyor 16 in the conveying direction are connected to two first conveyors 11 at different heights respectively, with each conveying surface connected to the first conveyor 11. The second conveyor 16 has a plurality of second rollers 18.

[0039] The second roller 18 is a cylindrical shape extending in the V direction (see...). Figure 2The second roller 18 is made of metal. The second roller 18 has a support shaft (not shown). The support shaft of the second roller 18 is along the central axis of the second roller 18. The support shaft of the second roller 18 is rotatably supported on the support frame of the second conveyor 16. A plurality of second rollers 18 are arranged side-by-side in the direction along the second conveying surface 17 with the same spacing length P as the plurality of first rollers 13 of the first conveyor 11. That is, the second conveying surface 17 extends in the arrangement direction of the plurality of second rollers 18 and is imaginarily formed along a tangent that is tangent to the side of the plurality of second rollers 18 in the vertical direction.

[0040] It should be noted that the plurality of second rollers 18 are each configured as rollers with unavoidable positional offsets relative to the second conveying surface 17, such as assembly tolerances.

[0041] The first conveyor 11 and the second conveyor 16 may also each have a drive roller (not shown). The drive roller can be rotated by a drive device (not shown), thereby conveying the conveying container 20, which is in contact with the upper part of the drive roller, in the +U direction. Alternatively, some or all of the plurality of first rollers 13 and / or the plurality of second rollers 18 may be drive rollers.

[0042] <Transport Container 20>

[0043] The transport container 20 is a box capable of holding items on its inner side. For example... Figure 2 As shown, the conveying container 20 is conveyed on the conveying surface of the conveyor group 10 with its bottom side in contact with multiple rollers 13, 18. Figures 2-4 As shown, the conveying container 20 has a container body 21 and multiple buffer plates 40.

[0044] <Container Body 21>

[0045] like Figure 3 As shown, the container body 21 is a generally rectangular box with an opening in the vertical direction when the bottom is placed horizontally. The container body 21 is made of polyethylene. The container body 21 may also be formed from resin materials other than polyethylene, such as polypropylene, PET, or polyamide. The container body 21 is formed by vacuum forming. The forming method of the container body 21 may also be a method other than vacuum forming, such as compression molding or injection molding. The container body 21 has a bottom 23 and multiple sidewall portions 22.

[0046] The bottom 23 is a rectangular plate parallel to the XY plane. The edges of the bottom 23 are parallel to either the X or Y direction. When the conveying container 20 is placed on the first conveyor 11 or the second conveyor 16, the bottom 23 extends along the first conveying surface 12 or the second conveying surface 17. At this time, the X direction of the bottom 23 is along the conveying direction (U direction) of the first conveyor 11 or the second conveyor 16. That is, when the conveyor group 10 conveys the conveying container 20 in the U direction, the conveying container 20 is conveyed relative to the conveyor group 10 in the X direction. At this time, the direction orthogonal to both the X and Y directions and relative to the bottom 23 towards the first conveyor 11 or the second conveyor 16 is defined as the -Z direction. The -Z direction is an example of the first direction. The direction opposite to the -Z direction is defined as the +Z direction. At this time, the rollers 13 and 18 extend along the Y direction.

[0047] It should be noted that, depending on the configuration of the conveyor group 10, the conveying direction of the conveying container 20 is not limited to the X direction; it may switch to the Y direction or to a direction inclined relative to the X and Y directions. In the following description, unless otherwise specified, only the case where the conveying container 20 is conveyed in the X direction will be described.

[0048] The bottom 23 has an opposing portion 23a. Details about the opposing portion 23a will be described later.

[0049] like Figure 3 As shown, the sidewall portions 22 are rectangular plates extending from each edge of the bottom 23 in the +Z direction. That is, multiple sidewall portions 22 surround the bottom 23 and extend from the bottom 23 to the side opposite to the conveying surfaces 12 and 17. The container body 21 of this embodiment has four sidewall portions 22.

[0050] The four sidewall portions 22 form openings 21a surrounded by their respective +Z side ends. The openings 21a are rectangular in shape when viewed from above in the Z direction. In this embodiment, the openings 21a are square in shape when viewed from above in the Z direction.

[0051] like Figure 2 As shown, the opposing portion 23a protrudes from the -Z side of the bottom 23 towards the -Z side. That is, the opposing portion 23a faces the outside of the container body 21. When the conveying container 20 is placed on the first conveyor 11 or the second conveyor 16, the opposing portion 23a faces the first conveying surface 12 or the second conveying surface 17.

[0052] like Figure 5As shown, in a top view taken from the Z direction, the facing portion 23a of this embodiment has a rectangular shape. The top view of the facing portion 23a is smaller than that of the opening 21a. The facing portion 23a is located further inward than the opening 21a in the top view. The facing portion 23a of this embodiment has four corner portions 23b.

[0053] Preferably, the shape of the opposing portion 23a is symmetrical around the center point (center of view) CT of the outer shape of the opposing portion 23a in a top view. For a more concrete explanation, as shown below... Figure 5 As shown, consider the case where the opposing portion 23a is divided into four quadrants by an imaginary straight line passing through the center point CT and extending in the X or Y direction. In this case, it is preferable that the shape of the opposing portion 23a in one quadrant has a shape that rotates the opposing portions 23a in the adjacent quadrants by 90 degrees around the center point CT. In this case, it is preferable that the outer shape of the opposing portion 23a in one quadrant is smoothly connected to the outer shape of the opposing portions 23a in the adjacent quadrants. The opposing portion 23a of this embodiment has a square shape in top view.

[0054] When two container bodies 21 are stacked in an overlapping manner in the Z direction, the container body 21 on the +Z side can be stacked on top of the container body 21 on the -Z side such that the opposing portion 23a of the +Z side container body 21 is housed inside the opening 21a of the -Z side container body 21. That is, the container bodies 21 can be stacked stably side by side on top of other empty container bodies 21.

[0055] In this embodiment, the opposing portion 23a is formed by a lattice-like structure of reinforcing ribs 24.

[0056] like Figure 6 As shown, the reinforcing rib group 24 is formed by interconnecting and / or intersecting multiple thin plate-like ribs that rise from the -Z side of the bottom 23 towards the -Z side. The reinforcing rib group 24 functions to reinforce the strength of the bottom 23. The reinforcing rib group 24 has a first rib group 25 and a second rib group 31.

[0057] like Figure 5 As shown, the first rib group 25, in top view, is a rectangular frame forming the outer periphery of the opposing portion 23a. The first rib group 25 has an outer frame rib 26, an inner frame rib 27, and a plurality of separating ribs 28. The first rib group 25 further has rib group corner portions 25a. The first rib group 25 further has a plurality of first grids 29.

[0058] The outer frame rib 26, when viewed from above, is a rectangular frame positioned on the outermost side relative to the center point CT.

[0059] In top view, the inner frame rib 27 is a rectangular frame positioned on the CT side of the center point relative to the outer frame rib 26. In top view, the inner frame rib 27 surrounds the second rib group 31.

[0060] Separating ribs 28 are disposed between the outer frame rib 26 and the inner frame rib 27. Multiple separating ribs 28 are arranged at predetermined intervals along the extending directions of the outer frame rib 26 and the inner frame rib 27. The separating ribs 28 are orthogonal to the outer frame rib 26 and the inner frame rib 27.

[0061] The corner portion 25a of the rib group is the corner portion of the first rib group 25, which is rectangular in shape. The corner portion 25a of the rib group corresponds to the corner portion 23b of the opposing portion 23a.

[0062] The first grid 29 is rectangular, surrounded by two adjacent dividing ribs 28, the outer frame rib 26, and the inner frame rib 27 extending in the direction of the outer frame rib 26 and the inner frame rib 27. That is, the first rib group 25 is divided into multiple first grids 29 by multiple dividing ribs 28. The multiple first grids 29 are arranged along the direction of the outer frame rib 26 and the inner frame rib 27. That is, the multiple first grids 29 are arranged along the direction of the -Z side of the bottom 23. At this time, the multiple dividing ribs 28 separate the multiple first grids 29 arranged along the direction of the outer frame rib 26 and the inner frame rib 27. The dividing ribs 28 are an example of a dividing portion.

[0063] like Figure 6 As shown, the surface of the bottom 23, surrounded by a plurality of first grids 29, is positioned on the +Z side relative to the -Z side end of the first rib group 25. In other words, the surface of the bottom 23, surrounded by a plurality of first grids 29, is recessed into the bottom 23 side relative to the first rib group 25 of the opposing portion 23a. The first grid 29 is an example of a recess.

[0064] like Figure 5 As shown, the second rib group 31 is formed at the center point CT side relative to the inner frame rib 27 in top view. The second rib group 31 has a plurality of first inclined ribs 32, a plurality of second inclined ribs 33, and a plurality of intersections 34. The second rib group 31 further has a cross rib group 35. The second rib group 31 further has a plurality of second grids 36.

[0065] The first inclined rib 32, viewed from above, is a straight line extending in a first inclined direction inclined relative to the X direction. That is, the first inclined rib 32 extends in a direction inclined relative to the conveying direction of the conveying container 20 based on the first conveyor 11 or the second conveyor 16. In this embodiment, the first inclined direction has an angle of 45 degrees relative to the X direction. The first inclined rib 32 is formed in such a way that it connects the two edges of the inner frame rib 27. A plurality of first inclined ribs 32 are spaced apart from each other at a predetermined interval and arranged side by side in a direction orthogonal to the first inclined direction.

[0066] The second inclined rib 33, in top view, is a straight line extending in a manner intersecting the first inclined rib 32. That is, the second inclined rib 33 extends in a second inclined direction that intersects the first inclined direction. In this embodiment, the second inclined rib 33 is orthogonal to the first inclined rib 32. The second inclined rib 33 is formed in such a manner that it intersects the first inclined rib 32 and connects the two edges of the inner frame rib 27. A plurality of second inclined ribs 33 are spaced apart from each other at predetermined intervals and arranged side by side in the first inclined direction.

[0067] The intersection 34 is the location where the first inclined rib 32 and the second inclined rib 33 intersect. Multiple intersections 34 are formed in the second rib group 31, corresponding to multiple first inclined ribs 32 and multiple second inclined ribs 33.

[0068] Multiple intersecting rib groups 35 are formed correspondingly to multiple intersecting portions 34. For specific illustration, consider one intersecting rib group 35 corresponding to one of the multiple intersecting portions 34. A intersecting rib group 35 is a cross-shaped structure formed by an intersecting portion 34, two first inclined ribs 32 surrounding the intersecting portion 34, and two second inclined ribs 33 surrounding the intersecting portion 34. The first inclined ribs 32 of a intersecting rib group 35 are the portion of the multiple first inclined ribs 32 that intersects with the intersecting portion 34. The second inclined ribs 33 of a intersecting rib group 35 are the portion of the multiple second inclined ribs 33 that intersects with the intersecting portion 34.

[0069] The second grid 36 is rectangular, surrounded by two adjacent first inclined ribs 32 and two adjacent second inclined ribs 33. That is, the second rib group 31 is divided into multiple second grids 36 by multiple first inclined ribs 32 and multiple second inclined ribs 33. The multiple second grids 36 are arranged along either a first or a second inclined direction. That is, the multiple second grids 36 are arranged side-by-side along the -Z side of the bottom 23. In this case, the multiple first inclined ribs 32 and multiple second inclined ribs 33 separate the multiple second grids 36 arranged along either the first or second inclined direction. The first inclined ribs 32 and second inclined ribs 33 are examples of separating portions.

[0070] like Figure 6 As shown, the surface of the bottom 23, surrounded by a plurality of second grids 36, is positioned on the +Z side relative to the -Z side end of the second rib group 31. In other words, the surface of the bottom 23, surrounded by a plurality of second grids 36, is recessed into the bottom 23 side relative to the second rib group 31 of the opposing portion 23a. The second grids 36 are examples of recesses.

[0071] <Buffer Plate 40>

[0072] like Figure 2 as well as Figure 4As shown, the buffer sheet 40 is a cushioning material that can be installed on the opposing portion 23a of the container body 21. When the conveying container 20 is placed on the first conveyor 11 or the second conveyor 16, the buffer sheet 40 contacts the first roller 13 and / or the second roller 18.

[0073] like Figure 4 As shown, the buffer sheet 40 is mounted on the container body 21 in a manner that overlaps with the corner 23b of the opposing portion 23a (i.e., the corner 25a of the reinforcing rib group 24) in a top view. Four buffer sheets 40 are mounted on the container body 21 in this embodiment.

[0074] The maximum length of the buffer sheet 40 in the X and Y directions is less than 50% of the maximum length of the opposing portion 23a in the X and Y directions, respectively. That is, the maximum length of the sheet portion 50 in the X and Y directions, as described later, is less than 50% of the maximum length of the opposing portion 23a in the X and Y directions, respectively.

[0075] When the conveying container 20 placed on the conveyor group 10 is conveyed in the +X direction, it is preferable that the maximum length of the buffer sheet 40 in the X direction is longer than the distance P between the rollers 13 and 18 of the conveyor group 10. That is, it is preferable that the maximum length of the sheet portion 50 in the X direction is longer than the distance P between the rollers 13 and 18.

[0076] In top view, the buffer plate 40 is mounted to the container body 21 in a manner that does not offset away from the center point CT relative to the corner 23b of the opposing portion 23a. In other words, in top view, the buffer plate 40 is mounted to the container body 21 in a manner that does not protrude outward relative to the opposing portion 23a. That is, as... Figure 2 As shown, the buffer sheet 40 is installed on the container body 21 in such a way that it does not protrude downstream in the conveying direction of the conveying container 20 compared to the opposing portion 23a. Thus, in top view, the buffer sheet 40 is positioned further inward than the opening 21a.

[0077] The buffer sheet 40 is formed of an elastomer. The elastomer is preferably, for example, nitrile rubber (NBR), fluororubber (FKM), acrylic rubber (ACM), silicone rubber, or polyurethane rubber. Preferably, the elastomer has a rubber hardness of 50A or higher. More preferably, the buffer sheet 40 is formed of polyurethane rubber with excellent shock absorption properties.

[0078] The buffer sheet 40 has a sheet portion 50 and a group of protrusions 60. The sheet portion 50 and the group of protrusions 60 are integrally formed.

[0079] <Part 50>

[0080] like Figure 4 as well as Figure 7 As shown, plate 50 is a rectangular plate parallel to the XY plane. (As...) Figure 4 As shown, in a top view taken from the Z direction, the sheet portion 50 of this embodiment is approximately square. Figure 7 As shown, the sheet portion 50 of this embodiment has four corner portions 56. The sheet portion 50 further has a central portion 58. The central portion 58 overlaps with the center of the image in the top view. Figure 4 As shown, in top view, the sheet portion 50 is arranged such that each edge of the sheet portion 50 is parallel to the edge of the opposing portion 23a.

[0081] The sheet portion 50 further has a first surface 50a and a second surface 50b. For example... Figure 4 As shown, the first surface 50a faces the -Z direction. That is, the first surface 50a is in contact with the conveyor group 10. Figure 7 As shown, the second surface 50b faces the +Z direction. That is, the second surface 50b is in contact with the opposing portion 23b. In other words, as... Figure 4 As shown, the sheet portion 50 covers at least a portion of the opposing portion 23a.

[0082] like Figure 7 As shown, the sheet portion 50 further includes a sheet edge portion 51, a first end portion 52, and a second end portion 54.

[0083] The edge portion 51 is along the outer periphery of the rectangular portion 50 when viewed from above. The edge portion 51 is separate from the central portion 58 of the sheet.

[0084] When the buffer plate 40 is installed on the opposing part 23a, the first end 52 is the end edge that is furthest away from the center point CT of the opposing part 23a in the X direction and extends in the Y direction. In the buffer plate 40 with the first end 52 moving away from the center point CT towards the +X side, the first end 52 becomes the front end relative to the conveying direction of the conveying container 20 being conveyed in the +X direction.

[0085] When the buffer plate 40 is installed on the opposing part 23a, the second end 54 is the end edge that is furthest away from the center point CT of the opposing part 23a in the Y direction and extends in the X direction. In the buffer plate 40 where the second end 54 moves away from the center point CT towards the +Y side, assuming that the conveying container 20 is conveyed in the +Y direction, the second end 54 becomes the front end relative to the conveying direction of the conveying container 20.

[0086] The corner portion 56, viewed from above, has a shape in which the corners of a rectangle are rounded into an arc. The edge of the corner portion 56 is smoothly connected to the first end portion 52 and the second end portion 54. The length of the first end portion 52 in the Y direction is shorter than the maximum length of the plate portion 50 in the Y direction. The length of the second end portion 54 in the X direction is shorter than the maximum length of the plate portion 50 in the X direction.

[0087] <Group 60>

[0088] like Figure 7 As shown, the protrusion group 60 is composed of a plurality of protrusions projecting from the second surface 50b toward the +Z side. Each protrusion constituting the protrusion group 60 is provided corresponding to the first grid 29 or the second grid 36 of the opposing portion 23a. When the buffer sheet 40 is installed in the opposing portion 23a, each protrusion constituting the protrusion group 60 can be inserted into the first grid 29 or the second grid 36. At this time, each protrusion constituting the protrusion group 60 elastically deforms according to its insertion into the first grid 29 or the second grid 36, thereby applying a pressing force to the opposing portion 23a to prevent the buffer sheet 40 from falling off the opposing portion 23a.

[0089] The protrusion group 60 has a first protrusion 70, a second protrusion 80, a third protrusion 90, and a fourth protrusion 100.

[0090] The first protrusion 70 corresponds to any one of the plurality of partition ribs 28. That is, the first protrusion 70 corresponds to any one of two adjacent first cells 29. In this embodiment, the first protrusion 70 has at least two wall-like protrusions 72. The wall-like protrusions 72 extend along the extending direction of the partition ribs 28 and extend from the second surface 50b of the sheet portion 50 toward the +Z side. In a top view viewed from the Z direction, the two wall-like protrusions 72 clamp the partition ribs 28 and overlap with the two adjacent first cells 29 respectively.

[0091] When the buffer plate 40 is installed on the opposing part 23a, the two wall-shaped protrusions 72 are elastically deformed and inserted into the two adjacent first cells 29 respectively, corresponding to their contact with the partition rib 28. At this time, the two wall-shaped protrusions 72 apply a clamping force while holding the partition rib 28. The two wall-shaped protrusions 72 are an example of clamping parts that clamp the partition rib 28, which serves as a partition.

[0092] When the buffer sheet 40 is installed on the opposing portion 23a having a plurality of partition ribs 28, it is preferable that the protrusion group 60 has a plurality of first protrusions 70 corresponding to a portion of the plurality of partition ribs 28. In this embodiment, the first protrusions 70 are provided corresponding to the partition ribs 28 that overlap with the two ends of the first end 52 in the Y direction and the two ends of the second end 54 in the X direction. That is, when the buffer sheet 40 is installed on the opposing portion 23a, the first protrusions 70 in this embodiment are provided at each corner 56 except for the corner 56 closest to the center point CT of the opposing portion 23a.

[0093] The second protrusion 80 corresponds to any one of the plurality of second cells 36. In a top view taken from the Z direction, the second protrusion 80 overlaps with one of the plurality of second cells 36. In this embodiment, the second protrusion 80 is cylindrical, extending from the second surface 50b of the sheet portion 50 toward the +Z side.

[0094] When the buffer plate 40 is installed on the opposing portion 23a, the second protrusion 80 is inserted into the second grid 36 while elastically deforming in response to contact with the first inclined rib 32 and the second inclined rib 33 forming the second grid 36. At this time, the second protrusion 80 applies a pressing force to the first inclined rib 32 and the second inclined rib 33 forming the second grid 36. That is, the second protrusion 80 has an interference fit relative to the second grid 36.

[0095] When the buffer sheet 40 is installed on the opposing portion 23a having a plurality of second cells 36, it is preferable that the protrusion group 60 has a plurality of second protrusions 80 corresponding to a portion of the plurality of second cells 36.

[0096] The third protrusion 90 corresponds to any one of the plurality of intersecting rib groups 35. That is, the third protrusion 90 corresponds to a plurality of second cells 36 adjacent to any one of the plurality of intersecting portions 34. The third protrusion 90 of this embodiment has at least four V-shaped protrusions 92. The four V-shaped protrusions 92 each correspond to the four second cells 36 adjacent to one intersecting portion 34. The V-shaped protrusions 92 extend from the second surface 50b of the plate portion 50 toward the +Z side in a manner that forms a bent V-shape in the portion in contact with the intersecting portion 34 in plan view. The two inclined portions of the V-shaped protrusions 92 in plan view extend along the extension direction of the first inclined rib 32 or the second inclined rib 33, respectively.

[0097] When the buffer plate 40 is installed on the opposing part 23a, the two adjacent V-shaped protrusions 92 that clamp the first inclined rib 32 in top view are elastically deformed and inserted into the two adjacent second compartments 36 respectively, corresponding to their contact with the first inclined rib 32. At this time, the two V-shaped protrusions 92 apply a pressing force while clamping the first inclined rib 32.

[0098] When the buffer plate 40 is installed on the opposing part 23a, the two adjacent V-shaped protrusions 92 that clamp the second inclined rib 33 in top view are elastically deformed and inserted into the two adjacent second grids 36 respectively, corresponding to their contact with the second inclined rib 33. At this time, the two V-shaped protrusions 92 apply a pressing force while clamping the second inclined rib 33.

[0099] The four V-shaped protrusions 92 are examples of clamping parts that clamp the first inclined rib 32 or the second inclined rib 33, which serve as the dividing part.

[0100] When the buffer sheet 40 is installed on the opposing portion 23a, the third protrusion 90 of this embodiment is provided at the corner portion 56 closest to the center point CT of the opposing portion 23a. That is, the third protrusion 90 and the plurality of first protrusions 70 of this embodiment are provided along the edge portion 51 of the sheet portion 50.

[0101] The fourth protrusion 100 corresponds to any one of the plurality of first inclined ribs 32 or second inclined ribs 33. That is, the fourth protrusion 100 corresponds to any two adjacent second cells 36 of the plurality of second cells 36. The fourth protrusion 100 of this embodiment has at least two wall-like protrusions 102. The wall-like protrusions 102 extend along the extending direction of the first inclined ribs 32 or second inclined ribs 33 and extend from the second surface 50b of the sheet portion 50 toward the +Z side. In a top view viewed from the Z direction, the two wall-like protrusions 102 clamp the first inclined ribs 32 or second inclined ribs 33 and overlap with two adjacent second cells 36 respectively.

[0102] When the buffer plate 40 is installed on the opposing portion 23a, the two wall-shaped protrusions 102 are elastically deformed and inserted into two adjacent second compartments 36 respectively, corresponding to their contact with the first inclined rib 32 or the second inclined rib 33. At this time, the two wall-shaped protrusions 102 apply a clamping force while clamping the first inclined rib 32 or the second inclined rib 33. The two wall-shaped protrusions 102 are an example of a clamping part that clamps the first inclined rib 32 or the second inclined rib 33, which serves as a separating part.

[0103] In this embodiment, the fourth protrusion 100 is preferably provided at the center portion 58 of the sheet. In this embodiment, the fourth protrusion 100 is preferably provided away from each of the plurality of sheet corner portions 56 when viewed from above.

[0104] When multiple buffer plates 40 are installed on multiple corner portions 23b, it is preferable that the orientation of each buffer plate 40 is changed by aligning it with the angle of the center point CT relative to the respective corner portion 23b, thereby enabling the alignment of the protrusion group 60 with the opposing portion 23a. Specifically, it is preferable to install on Figure 4 The orientation of the buffer plate 40 at the upper right corner 23b in the figure is the same as the orientation of the buffer plate 40 installed at the upper left corner 23b in the figure, rotated 90 degrees to the right. In particular, when the opposing portions 23a are symmetrical around the center point CT of the opposing portions 23a, it is preferable to change the orientation of the buffer plate 40 to match the angle relative to the center point CT of the corner 23b, so that the protrusion group 60 of the buffer plate 40 can be aligned with the opposing portion 23a.

[0105] (Functions and effects)

[0106] Next, the function and effect of the conveying container 20 and the buffer sheet 40 will be explained.

[0107] The buffer sheet 40 has a group of protrusions 60. The group of protrusions 60 elastically deforms upon insertion into the first grid 29 or the second grid 36, thereby applying a pressing force to the opposing portion 23a to prevent the buffer sheet 40 from detaching from it. Therefore, the buffer sheet 40 can be easily installed onto the opposing portion 23a of the container body 21. Furthermore, the buffer sheet 40 can be easily removed from its installed state on the container body 21. Therefore, the buffer sheet 40 has excellent installability relative to the container body 21. The group of protrusions 60 is integrally formed with the sheet portion 50. Therefore, the number of components of the buffer sheet that can be installed on the container body 21 can be reduced. That is, according to the buffer sheet 40, a buffer sheet with excellent installability relative to the container body 21 and a small number of components can be provided.

[0108] The protrusion group 60 has a first protrusion 70 that clamps and applies a pressing force to the partition 28 when it is installed on the opposing part 23a. Therefore, according to the buffer sheet 40, the installability with respect to the container body 21 having the partition 28 can be improved.

[0109] It should be noted that the third protrusion 90 and / or the fourth protrusion 100 corresponding to the first inclined rib 32 and / or the second inclined rib 33 have the same effect as the first protrusion 70.

[0110] The protrusion group 60 has a second protrusion 80 that has an interference fit with the second grid 36 and applies a clamping force. Therefore, according to the buffer sheet 40, the installability with respect to the container body 21 having the second grid 36 can be improved.

[0111] The protrusion group 60 has a third protrusion 90 that clamps and applies a pressing force to the first inclined rib 32 and the second inclined rib 33 around the intersection 34. Regarding the conveying direction of the conveying container 20, depending on the configuration of the conveyor group 10, there is a case where it is conveyed while switching between the X direction, the Y direction, and directions inclined relative to the X direction and the Y direction (including various directions of the inclination of the first inclined rib 32 and the second inclined rib 33).

[0112] Assuming that the protrusion group only clamps and applies a clamping force to the first protrusion 70 of the partition rib 28 extending only in the X direction, the X-direction component of this clamping force is small. In this case, when the conveying container is subjected to vibration or impact during transport in the X direction, there is a concern that the buffer plate installed on the conveying container may detach from the container body 21 due to the small X-direction component of the clamping force. That is, when the protrusion group only clamps and applies a clamping force to the partition extending in one direction, there is a concern that the buffer plate may detach from the container body 21 when the conveying container is transported in that direction.

[0113] On the other hand, the protrusion group 60 of the embodiment has a third protrusion 90 that clamps and applies a compressive force to the first inclined rib 32 and the second inclined rib 33 extending in directions inclined relative to the X and Y directions. Therefore, according to the buffer sheet 40, when the conveying direction of the container body 21 can be switched to multiple directions, it is possible to prevent the buffer sheet 40 from falling off the container body 21 during conveying.

[0114] In particular, the third protrusion 90 clamps and applies a compressive force to the first inclined rib 32, which is inclined at 45 degrees relative to the X direction, and the second inclined rib 33, which is orthogonal to the first inclined rib 32. Therefore, according to the buffer sheet 40, when the conveying direction of the container body 21 can be switched to the X direction and the Y direction, it is possible to prevent the buffer sheet 40 from falling off the container body 21 during conveying.

[0115] The protrusion group 60 has a fourth protrusion 100 provided at the center portion 58 of the sheet. When the protrusion group is only provided at the edge portion 51 of the sheet, there is a concern that the center portion 58 of the buffer sheet 40, mounted on the opposing portion 23a, may float relative to the opposing portion 23a. In this case, the sealing of the buffer sheet 40 relative to the opposing portion 23a is reduced, raising concerns about diminishing the effectiveness of the buffer sheet 40. On the other hand, by having the fourth protrusion 100, the buffer sheet 40 can be mounted on the container body 21 in a state where a pressing force is applied to a portion of the opposing portion 23a corresponding to the center portion 58 of the sheet. Therefore, according to the buffer sheet 40, it is possible to suppress the floating of the center portion 58 of the sheet from the opposing portion 23a.

[0116] The length of the first end portion 52 of the buffer sheet 40 in the Y direction is shorter than the maximum length of the sheet portion 50 in the Y direction. When the conveying container 20 is conveyed in the X direction by the rollers 13, 18 extending in the Y direction, the size of the contact surface between the first end portion 52 and the rollers 13, 18 is smaller than the length of the front end portion of the buffer sheet in the Y direction, which is the maximum length of the sheet portion 50 in the Y direction. Therefore, according to the buffer sheet 40, the noise generated between the conveying container 20 and the rollers 13, 18 when the conveying container 20 is conveyed in the X direction can be reduced.

[0117] The length of the second end 54 of the buffer sheet 40 in the X direction is shorter than the maximum length of the sheet portion 50 in the X direction. When the conveying container 20 is conveyed in the Y direction by the rollers 13, 18 extending in the X direction, the size of the contact surface between the second end 54 and the rollers 13, 18 is smaller than the length of the front end of the buffer sheet in the X direction, which is the maximum length of the sheet portion 50 in the X direction. Therefore, according to the buffer sheet 40, the noise generated between the conveying container 20 and the rollers 13, 18 when it is conveyed in the Y direction can be reduced.

[0118] Thus, according to the buffer sheet 40, the noise generated between the conveying container 20 and the rollers 13 and 18 can be reduced.

[0119] The rubber hardness of the elastomer constituting the buffer sheet 40 is 50A or higher. Therefore, according to the buffer sheet 40, the noise generated between the buffer sheet and the rollers 13 and 18 during the conveying of the conveying container 20 can be reduced more effectively.

[0120] The elastomer constituting the buffer sheet 40 is polyurethane rubber. Polyurethane rubber has excellent shock absorption properties. Therefore, according to the buffer sheet 40, the vibration applied to the conveying container 20 during conveying can be reduced.

[0121] The lengths of the buffer sheet 40 in both the X and Y directions are longer than the spacing length P of the rollers 13 and 18. Consider the case where the conveying container 20 is conveyed on multiple rollers 13 and 18 along the arrangement direction of the rollers 13 and 18. In this case, assuming that the length of the buffer sheet in the conveying direction is shorter than the spacing length P, the buffer sheet will not contact two or more adjacent rollers 13 and 18 on the conveying surfaces 12 and 17. Therefore, when a buffer sheet with a length shorter than the spacing length P in the conveying direction is installed on the container body 21, the conveyability of the conveying container on the roller conveyor is reduced.

[0122] On the other hand, since the length of the buffer plate 40 in the conveying direction of the conveying container 20 being conveyed on the roller conveyor is longer than the spacing length P, the buffer plate 40 contacts two or more adjacent rollers 13 and 18 on the conveying surfaces 12 and 17. Therefore, the conveying performance of the conveying container 20 on the roller conveyor can be maintained according to the buffer plate 40.

[0123] The buffer sheet 40 is installed on the container body 21 in a manner that does not protrude downstream of the conveying container 20 in the conveying direction relative to the opposing portion 23a. When the buffer sheet of a conveying container being conveyed on a roller conveyor protrudes downstream of the conveying container in the conveying direction relative to the opposing portion 23a, there is a concern that it may curl as the front end of the sheet portion 50 contacts the rollers 13 and 18 in the conveying direction. On the other hand, when the buffer sheet 40 is in a state where the front end of the sheet portion 50 in the conveying direction is tightly closed to the opposing portion 23a by the protrusion group 60, it is less likely to curl even when in contact with the rollers 13 and 18. Therefore, according to the buffer sheet 40, it is possible to suppress the curling of the buffer sheet during conveying on the roller conveyor when it contacts the rollers 13 and 18.

[0124] The conveying container 20 has a buffer sheet 40 formed of an elastomer. For example... Figure 8 As shown, when the container body 21 is conveyed on a roller conveyor with its body in direct contact with the rollers 13 and 18, noise is generated due to interference between the rollers and the conveying container. Therefore, according to the conveying container 20, the noise generated between it and the rollers can be reduced during conveying on the roller conveyor.

[0125] In the conveying container 20, multiple buffer plates 40 are installed in a manner that overlaps with multiple corner portions 23b of the opposing portion 23a. Therefore, the conveying capacity of the conveying container 20 can be maintained. Furthermore, the lengths of the plate portions 50 in the X and Y directions of the buffer plates 40 are less than 50% of the lengths of the opposing portion 23a in the X and Y directions. Therefore, the operability of the buffer plates 40 during installation in the conveying container 20 can be improved.

[0126] In the transport container 20, the buffer sheet 40 is installed relative to the container body 21, which has an opening 21a and an opposing portion 23a, in a manner that does not protrude from the opposing portion 23a when viewed from above. Therefore, according to the transport container 20, with the buffer sheet 40 installed, it is possible to stack stably side-by-side on top of other unloaded transport containers 20 (or container bodies 21).

[0127] As described above, although an embodiment of the present invention has been described as an example, the present invention is not limited to the above embodiment, and various modifications, alterations and improvements can be made within the scope of the technical concept of the present invention.

[0128] The buffer sheet 40 is configured to be installed on the container body 21 by inserting the protrusion group 60 into the first cell 29 or the second cell 36. However, as Figure 9 As shown, the buffer sheet involved in this disclosure may also be in the form of being installed on the container body 21 by means of protrusions and adhesive components such as double-sided tape.

[0129] Figure 9 The buffer sheet 140 shown further includes double-sided adhesive tape 111 and double-sided adhesive tape 112 compared to the buffer sheet 40. Double-sided adhesive tape 111 is provided on the second surface 50b of the sheet portion 50 along the edge 51 on the side of the first end 52. Double-sided adhesive tape 112 is provided on the sheet portion 50 along the edge 51 on the side of the second end 54. Double-sided adhesive tapes 111 and 112 each have a first adhesive surface (not shown) and second adhesive surfaces 111b and 112b. The first adhesive surface can be adhered to the sheet portion 50. The second adhesive surfaces 111b and 112b can be adhered to the container body 21. Double-sided adhesive tapes 111 and 112 are adhered to the sheet portion 50 in a manner that does not overlap with the protrusion group 60 in top view. Double-sided adhesive tapes 111 and 112 are examples of adhesive components. By having double-sided adhesive tapes 111 and 112, the buffer sheet 140 can improve its seal relative to the container body 21.

[0130] If the adhesive component involved in this disclosure does not overlap with the protrusion group 60 in top view, it can also be provided integrally with respect to the second surface 50b of the sheet portion 50.

[0131] The conveying container 20 is configured to mount the buffer sheet 40 in a manner that overlaps with multiple corners 23b of the opposing portion 23a in a top view. However, as Figure 10 The conveying container 240 shown in this disclosure may also have a form in which a buffer sheet is further mounted on the central portion of the opposing portion 23a. The central portion of the opposing portion 23a is a part of the opposing portion 23a that is away from each of the plurality of corner portions 23b, and is a part around the center point CT. That is, the conveying container according to this disclosure may also have a form in which at least a portion of the sheet portion of the plurality of buffer sheets is mounted in a manner that overlaps with the central portion of the opposing portion 23a in top view.

[0132] When the buffer sheet is only installed at the multiple corners 23b of the opposing portion 23a, there is a concern that the central portion of the opposing portion 23a may deform due to its own weight. In particular, when an article is placed in the transport container 20, there is a concern that the central portion of the opposing portion 23a may deform due to the weight of the article. On the other hand, when at least a portion of the sheet according to this disclosure, as in the transport container 240, is installed in a manner that overlaps with the central portion of the opposing portion 23a in plan view, deformation is suppressed by supporting the central portion of the opposing portion 23a with the sheet. Therefore, according to the transport container 240, deformation of the central portion of the container body 21 can be suppressed.

[0133] The buffer sheet 40 has a sheet portion 50 that, when viewed from above, has a sheet corner portion 56 with the corners of a rectangle rounded into an arc shape. However, if the length of the front end portion of the sheet portion in the width direction orthogonal to the conveying direction is shorter than the maximum length in the width direction of the sheet portion, it is not limited to having a shape with the corners of a rectangle (sheet corner portion) rounded into an arc shape.

[0134] For example, such as Figure 10 , Figure 11 , Figure 12 As shown, the sheet portion involved in this disclosure may also have a shape in which the corners (sheet corners) of the rectangle on the downstream side of the conveying direction are chamfered in a straight line with respect to the conveying direction in plan view. That is, the sheet portion involved in this disclosure may also be a polygon other than a quadrilateral in plan view. In addition, the sheet portion involved in this disclosure may also be a quadrilateral shape without rounded or chamfered corners in plan view.

[0135] like Figure 13 As shown, the sheet portion involved in this disclosure can also be circular in top view.

[0136] The sheet portion 50 is configured to be approximately square in top view. That is, the sheet portion 50 is configured to have a shape that is point-symmetric with respect to the center point (center of view) of the sheet portion 50 in top view. However, the sheet portion involved in this disclosure may also not have a point-symmetric shape. For example, as Figure 12 The buffer sheet 440 shown in this disclosure may also have a shape symmetrical with respect to the center line CL of the sheet 450. In this case, by changing the orientation of the buffer sheet 440 relative to the opposing portion 23a by aligning it with the angle relative to the center point CT of each corner 23b, the orientation of the buffer sheet 440 relative to the corner 23b can be easily determined visually when aligning the protrusion group 60 with respect to the opposing portion 23a. Furthermore, the corner portion of the sheet disclosed in this disclosure that is closest to the center point CT of the opposing portion 23a may have a different shape than the other corner portions. The corner portion of the sheet disclosed in this disclosure that is farthest from the center point CT of the opposing portion 23a may also have a different shape than the other corner portions.

[0137] The first tilting direction of the first tilting rib 32 is tilted at an angle of 45 degrees relative to the X direction. However, the tilting angle of the first tilting direction relative to the X direction in this disclosure may not be 45 degrees.

[0138] The second inclined rib 33 is configured to be orthogonal to the first inclined rib 32. However, if the second inclined rib of this disclosure intersects with the first inclined rib 32, it may not be orthogonal.

[0139] The second rib group 31 is configured to have a plurality of first inclined ribs 32 and a plurality of second inclined ribs 33. However, the second rib group 31 of this disclosure may further have one or more third inclined ribs. The third inclined rib extends in a direction different from the first and second inclined ribs.

[0140] The cross rib group 35 is designed in a cross shape. However, the cross rib group involved in this disclosure is not limited to a cross shape. The cross rib group involved in this disclosure can also be formed by multiple ribs extending along multiple diagonals of an imaginary polygon other than a quadrilateral. The cross rib group involved in this disclosure can also be formed by an intersection set as the center of an imaginary polygon other than a quadrilateral, and multiple ribs extending radially from the intersection towards each vertex. The cross rib group involved in this disclosure can also be formed by multiple ribs forming a honeycomb-like grid.

[0141] In this embodiment, the first protrusion 70 and the third protrusion 90 are respectively disposed at the corner portion 56 of the buffer sheet 40. However, if the first protrusion of this disclosure corresponds to any one of the plurality of separating ribs 28, it may also be disposed at a location other than the corner portion 56. If the third protrusion of this disclosure corresponds to any one of the plurality of intersecting rib groups 35, it may also be disposed at a location other than the corner portion 56.

[0142] In the preferred embodiment, the fourth protrusion 100 is disposed at the central portion 58 of the buffer sheet 40. However, if the fourth protrusion of this disclosure corresponds to any two adjacent second cells 36 among the plurality of second cells 36, it may also be disposed at a location other than the central portion 58.

[0143] The conveying container 20 is configured to be conveyed on a fixed conveyor group 10 having multiple rollers 13, 18. However, the conveyor involved in this disclosure is not limited to a fixed roller conveyor. If the conveyor involved in this disclosure has a conveying surface having multiple rollers and capable of carrying the conveying container, it can also be an AGV (Automatic Guided Vehicle) or an AMR (Autonomous Mobile Robot).

[0144] (Example)

[0145] To demonstrate the noise reduction effect of the buffer sheet according to this disclosure, an evaluation was conducted on conveying the transport containers of the embodiments and comparative examples according to this disclosure on a roller conveyor in one direction along the horizontal direction. In the evaluation, corresponding to the embodiments, the material, rubber hardness, thickness, and corner shape of the buffer sheet were varied, and the noise during transport was measured and the vibration level of the transport container was evaluated. In the noise evaluation, the noise level (dB) was measured three times under the same conditions, and the average of the three noise levels (dB) was calculated. In the vibration level evaluation, the vibration state of the transport container in the comparative examples described later was used as a benchmark to qualitatively evaluate the vibration state of the transport container in the embodiments.

[0146] As a comparative example with respect to the embodiment, an evaluation of the noise level and vibration level of the transport container during transport was conducted without installing the buffer sheet on the container body.

[0147] The container body, viewed from above, is roughly square with one side measuring 485mm in length. The height of the side walls of the container body is 170mm.

[0148] The opposing section, viewed from above, is approximately square with one side length of 465 mm. The height of the opposing section is 10 mm. Similar to the embodiment described above, the opposing section is constructed of a lattice-like structure of reinforcing ribs.

[0149] Four buffer plates are installed at the four corners of the opposing parts.

[0150] The buffer sheet is roughly square (rectangular) in shape with one side length of 150mm when viewed from above.

[0151] The distance between the rollers of the roller conveyor is 100mm.

[0152] When the buffer sheet is rectangular in top view and the corners of the buffer sheet are right angles, the length of the front end of the buffer sheet in the width direction in the conveying direction is equal to the maximum length of the buffer sheet in the width direction.

[0153] Figure 14A This is a table showing the specifications of the buffer sheets used in the various embodiments being evaluated, and the evaluation results of the noise and vibration levels in each embodiment and comparative example. Figure 14B This is a graph representing the noise evaluation results in each embodiment and comparative example.

[0154] The evaluation results from Examples 2 to 10 confirm that when the rubber hardness of the elastomer constituting the buffer sheet is 50A or higher, the noise during transport is reduced by more than 30% compared to the case without a buffer sheet (Comparative Example). In particular, the evaluation results from Example 9 confirm that when the corners of the sheet are chamfered, the noise during transport is reduced most significantly compared to the Comparative Example. Specifically, the noise during transport in Example 9 is reduced by 35% compared to the case without a buffer sheet.

[0155] The evaluation results from Examples 3 to 10 confirm that when the buffer sheet is formed of polyurethane rubber, the vibration level is reduced compared to the case without a buffer sheet (Comparative Example) and the case with a buffer sheet formed of silicone rubber (Examples 1 and 2). In particular, when using polyurethane rubber with a hardness of 85A, the vibration level is significantly reduced compared to the Comparative Example. This is because polyurethane rubber has excellent shock absorption properties.

Claims

1. A cushion sheet mountable to a container body that is a container body of a transport container and has a facing portion facing a first direction orthogonal to a bottom portion and serving as an outer side of the container body and a plurality of recessed portions recessed with respect to the facing portion, the cushion sheet having: a sheet portion provided so as to cover at least a portion of the facing portion and having a first face facing the first direction and a second face facing the facing portion side, the sheet portion being composed of an elastic body; and a protrusion group provided so as to protrude from the second face, composed of a plurality of protrusions integrally formed with the sheet portion, the protrusion group being insertable in correspondence with the plurality of recessed portions.

2. The cushion sheet according to claim 1, wherein at least a portion of the plurality of recessed portions are arranged side by side along an arrangement direction along the second face, the container body has a partition portion partitioning between the plurality of recessed portions arranged side by side in the arrangement direction, and the protrusion group has a first protrusion sandwiching the partition portion and applying a pressing force.

3. The cushion sheet according to claim 1 or 2, wherein the protrusion group has a second protrusion having an amount of interference with respect to at least a portion of the plurality of recessed portions and applying a pressing force.

4. The cushion sheet according to any one of claims 1 to 3, wherein the facing portion has a reinforcing rib group formed so as to stand up from a bottom portion of the container body toward the first direction, the reinforcing rib group having: a first inclined rib extending in a first inclined direction inclined with respect to a transport direction of the transport container in a face along the bottom portion; a second inclined rib extending in a second inclined direction crossing the first inclined direction in the face along the bottom portion; and a crossing portion crossing the first inclined rib and the second inclined rib, and the protrusion group has a third protrusion sandwiching the first inclined rib and the second inclined rib around the crossing portion and applying a pressing force.

5. The cushion sheet according to claim 4, wherein the transport direction is any one of a front-rear direction and a left-right direction orthogonal to the front-rear direction of the transport container, an inclination angle of the first inclined rib with respect to the front-rear direction is 45 degrees, and the second inclined rib is orthogonal with respect to the first inclined rib.

6. The cushion sheet according to any one of claims 1 to 5, wherein the sheet portion has a sheet central portion and a sheet edge portion, at least a portion of the plurality of protrusions is arranged along the sheet edge portion of the sheet portion, and the protrusion group has a fourth protrusion arranged at the sheet central portion.

7. The cushion sheet according to any one of claims 1 to 6, wherein the cushion sheet has an adhesive member having a first adhesive face capable of being adhered to the sheet portion and a second adhesive face capable of being adhered to the container body.

8. The cushion sheet according to any one of claims 1 to 7, wherein ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The piece portion has a front end portion with respect to a conveying direction of the conveying container, A length in a width direction of the front end portion orthogonal to the conveying direction is shorter than a maximum length in the width direction of the piece portion.

9. The cushioning sheet according to any one of claims 1 to 8, wherein A rubber hardness of the elastomer is 50A or more.

10. The cushioning sheet according to any one of claims 1 to 9, wherein The elastomer is a polyurethane rubber.

11. The cushioning sheet according to any one of claims 1 to 10, wherein The conveying container is conveyed on a conveyor including a plurality of rollers in contact with the rollers, the plurality of rollers being arranged side by side at intervals of a prescribed pitch length in a conveying direction of the conveying container, A length of the piece portion in the conveying direction is longer than the pitch length.

12. The cushioning sheet according to any one of claims 1 to 11, wherein The conveying container is conveyed on a conveyor including a plurality of rollers in contact with the rollers, the plurality of rollers being arranged side by side at intervals of a prescribed pitch length in a conveying direction of the conveying container, The piece portion is attached to the container main body in a manner that does not protrude toward a downstream side in the conveying direction of the conveying container compared to the facing portion.

13. A conveying container that is conveyed on a conveyor including a plurality of rollers arranged side by side in a conveying direction in contact with the rollers, the conveying container having: a container main body; and the cushioning sheet according to any one of claims 1 to 12, the container main body has a facing portion facing a conveying surface of the conveyor and a plurality of recessed portions recessed with respect to the facing portion, the cushioning sheet is attachable to the container main body.

14. The conveying container according to claim 13, wherein the conveying container has a plurality of the cushioning sheets, the facing portion has a plurality of corner portions corresponding to the plurality of the cushioning sheets, a length direction and a width direction of the piece portion of the plurality of the cushioning sheets each have a length that is less than 50% of a length in the length direction and a length in the width direction of the facing portion, the plurality of the cushioning sheets are attached in a manner that overlaps the plurality of corner portions of the facing portion.

15. The conveying container according to claim 13 or 14, wherein the cushioning sheet is attached in a manner that at least a portion of the piece portion overlaps a central portion in a plan view of the facing portion.

16. The conveying container according to any one of claims 13 to 15, wherein the container main body has: a bottom portion; a plurality of side wall portions surrounding the bottom portion and extending from the bottom portion toward a side opposite the conveying surface; and an opening portion surrounded by end portions of the plurality of side wall portions on a side opposite the bottom portion, the facing portion protrudes from the bottom portion toward a side opposite the side wall portions and is formed inside the opening portion in a plan view, the cushioning sheet is attached in a manner that does not protrude from the facing portion in a plan view.

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