Cushioning sheets and transport containers

Abstract

To provide a cushioning sheet that offers excellent attachment to the opposing parts of the container body and has a small number of parts. [Solution] A cushioning sheet 40 that can be attached to a container body 21 of a transport container 20, which has a container body 21 having a first opposing portion 23a facing a first direction perpendicular to the bottom portion 23 and facing the outside of the container body 21, and a plurality of recesses 29, 36 recessed relative to the opposing portion 23a, the cushioning sheet 40 having a sheet portion 50 made of elastomer, which is provided so as to cover at least a part of the opposing portion 23a and has a first surface 50a facing the first direction and a second surface 50b facing the opposing portion 23a side, and a group of protrusions 60 consisting of a plurality of protrusions 70, 80, 90, 100 provided so as to protrude from the second surface 50b and integrally molded with the sheet portion 50, the group of protrusions 60 that can be inserted corresponding to the plurality of recesses 29, 36.

Description

Technical Field

[0001] The present invention relates to a buffer sheet and a transport container.

Background Art

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

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When transporting a resin transport container using a roller conveyor having a plurality of metal rollers, noise is generated due to interference between the rollers and the transport container. In particular, at the connection point between an inclined conveyor whose position in the vertical direction of the transport surface becomes lower as it advances downstream in the transport direction and a horizontal conveyor arranged downstream in the transport direction of the inclined conveyor and having a transport surface along the horizontal direction, the noise caused by the interference between the rollers and the transport container becomes large. The noise caused by the interference between the rollers and the transport container acts as an unpleasant sound for the workers working around the conveyor. In order to reduce this noise, a buffer sheet capable of reducing the noise caused by the interference between the rollers and the transport container may be attached to the transport container. For the buffer sheet for the transport container, it is required that the positioning work for the transport container and the removal work from the transport container are easy. That is, the buffer sheet for the transport container is required to have excellent mounting properties. Further, when assembling a fixing member such as a bolt to attach the buffer sheet to the transport container, there is a concern about an increase in cost and variations in quality such as assembly accuracy. Therefore, the buffer sheet for the transport container is required to have a small number of parts.

[0005] This disclosure aims to provide a cushioning sheet that offers excellent attachment to the container body and has a small number of parts. [Means for solving the problem]

[0006] Aspects of the present disclosure are a cushioning sheet that can be attached to a container body of a transport container, the container body having a first direction perpendicular to the bottom and facing the first direction which is the outside of the container body, and a plurality of recesses that are recessed relative to the opposing portion, A sheet portion made of elastomer is provided so as to cover at least a part of the opposing portion, and has a first surface facing the first direction and a second surface facing the opposing portion side. A group of protrusions provided to protrude from the second surface and integrally molded with the sheet portion, comprising a group of protrusions that can be inserted corresponding to the plurality of recesses, It is a cushioning sheet having [a certain characteristic]. [Effects of the Invention]

[0007] According to this disclosure, it is possible to provide a cushioning sheet that offers excellent attachment to the container body and has a small number of parts. [Brief explanation of the drawing]

[0008] [Figure 1] This is a perspective view of the transport container and conveyor group according to the embodiment. [Figure 2] This is a side view of the transport container and conveyor group according to the embodiment. [Figure 3] This is a perspective view of the transport container according to the embodiment. [Figure 4] This is a plan view of the transport container of the embodiment, seen from the bottom. [Figure 5] This is a plan view of the container body of the embodiment, seen from the bottom. [Figure 6] This is a perspective view of the corner of the opposing part of the container body of the embodiment. [Figure 7] This is a perspective view of the cushioning sheet of the embodiment. [Figure 8]This is a side view enlargement of a comparative configuration of transport containers and conveyor systems. [Figure 9] This is a perspective view of a modified example of the cushioning sheet of the embodiment. [Figure 10] This is a plan view of a modified example of the transport container of the embodiment, seen from the bottom. [Figure 11] This is a plan view of a modified example of the transport container of the embodiment, seen from the bottom. [Figure 12] This is a plan view of a modified example of the transport container of the embodiment, seen from the bottom. [Figure 13] This is a plan view of a modified example of the transport container of the embodiment, seen from the bottom. [Figure 14] (a) A table showing the specifications of the cushioning sheets used in each example in the evaluation and the evaluation results for each example. (b) A graph showing the noise evaluation results for each example. [Modes for carrying out the invention]

[0009] The embodiments relating to this disclosure will be described below with reference to the drawings. The scale of the drawings is not necessarily accurate, and some features may be exaggerated or omitted.

[0010] In the following explanation, the direction along the horizontal is defined as the +U direction. The direction in which the axis along the +U direction extends is defined as the U direction. The direction along the horizontal and perpendicular to the U direction is defined as the V direction. The direction along one edge of the rectangular bottom surface of the transport container is defined as the X direction. The 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 transport container and perpendicular to the X direction is defined as the Y direction. The 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 facing the conveyor side relative to the bottom of the transport container is defined as the -Z direction. The direction opposite to the -Z direction is defined as the +Z direction.

[0011] As shown in FIG. 1, the transport container 20 according to an embodiment of the present disclosure can be transported by a conveyor group 10. The conveyor group 10 is used, for example, in a logistics warehouse. The conveyor group 10 of the embodiment includes a first conveyor 11 and a second conveyor 16.

[0012] The first conveyor 11 is a fixed roller conveyor having a first transport surface 12 along the horizontal direction. The first transport surface 12 is a virtual plane extending in the U direction. The first conveyor 11 can transport the transport container 20 placed on the first transport surface 12 along the first transport surface 12 in the +U direction. The first conveyor 11 has a plurality of first rollers 13. The first roller 13 is cylindrical and extends in the V direction (see FIG. 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 the central axis of the first roller 13. The support shaft of the first roller 13 is rotatably supported by the support frame of the first conveyor 11. The plurality of first rollers 13 are arranged side by side in the U direction at a predetermined pitch length P. The pitch length P is the distance between the support shafts of two adjacent first rollers 13. That is, the first transport surface 12 extends in the arrangement direction of the plurality of first rollers 13 and is virtually formed along a tangent line that is in contact with the plurality of first rollers 13 on the upper side in the vertical direction. Note that the plurality of first rollers 13 are each arranged to have an inevitable vertical displacement such as an assembly tolerance with respect to the first transport surface 12.

[0013] The second conveyor 16 is a fixed roller conveyor having a second conveying surface 17. As shown in FIG. 1, the second conveying surface 17 is a virtual plane inclined such that the position in the vertical direction decreases as it advances in the +U direction in the UV plane extending in the U direction. The second conveyor 16 can convey the transport container 20 placed on the second conveying surface 17 along the second conveying surface 17 in the +U direction and in the direction inclined vertically downward. Both ends in the conveying direction of the second conveyor 16 are respectively connected to two first conveyors 11 having different heights such that their respective conveying surfaces are connected. The second conveyor 16 has a plurality of second rollers 18. The second roller 18 is cylindrical and extends in the V direction (see FIG. 2). The 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 by the support frame of the second conveyor 16. The plurality of second rollers 18 are arranged side by side in the direction along the second conveying surface 17 with the same pitch 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 virtually formed along a tangent line that contacts the plurality of second rollers 18 on the upper side in the vertical direction. Note that the plurality of second rollers 18 are each arranged assuming that they have an unavoidable positional deviation such as an assembly tolerance with respect to the second conveying surface 17.

[0014] The first conveyor 11 and the second conveyor 16 may each have a drive roller (not shown). The drive roller can rotate by a drive device not shown, and can convey the transport container 20 in contact with the upper part of the drive roller in the +U direction. A part or all of the plurality of first rollers 13 and / or the plurality of second rollers 18 may be drive rollers.

[0015] <Transport Container 20> The transport container 20 is a box on which articles can be placed inside. As shown in Figure 2, the transport container 20 is transported on the transport surface of the conveyor group 10 with its bottom portion in contact with a plurality of rollers 13, 18. As shown in Figures 2 to 4, the transport container 20 has a container body 21 and a plurality of cushioning sheets 40.

[0016] <Container body 21> As shown in Figure 3, the container body 21 is a roughly rectangular box with an opening at the top vertically when the bottom is placed horizontally. The container body 21 is made of polyethylene. The container body 21 may also be made of a resin material other than polyethylene, such as polypropylene, PET, or polyamide. The container body 21 is formed by vacuum forming. The molding method for the container body 21 may be a method other than vacuum forming, such as compression molding or injection molding. The container body 21 has a bottom 23 and a plurality of side wall portions 22.

[0017] The bottom portion 23 is a rectangular plate parallel to the XY plane. The edges of the bottom portion 23 are parallel to the X direction or the Y direction, respectively. When the transport container 20 is placed on the first conveyor 11 or the second conveyor 16, the bottom portion 23 is aligned with the first transport surface 12 or the second transport surface 17. At this time, the X direction of the bottom portion 23 is aligned with the transport direction (U direction) of the first conveyor 11 or the second conveyor 16. That is, when the conveyor group 10 transports the transport container 20 in the U direction, the transport container 20 is transported in the X direction relative to the conveyor group 10. At this time, the direction that is perpendicular to the X and Y directions and faces the first conveyor 11 side or the second conveyor 16 side relative to the bottom portion 23 is called the -Z direction. The -Z direction is an example of the first direction. The direction opposite to the -Z direction is called the +Z direction. At this time, rollers 13 and 18 extend along the Y direction. Depending on the configuration of the conveyor group 10, the transport direction of the transport container 20 may not be limited to the X direction, but may switch to the Y direction or a direction inclined with respect to both the X and Y directions. In the following description, unless otherwise noted, only the case in which the transport container 20 is transported in the X direction will be described. The bottom portion 23 has an opposing portion 23a. The opposing portion 23a will be described in detail later.

[0018] As shown in Figure 3, the side wall portions 22 are rectangular plate-shaped and extend in the +Z direction from each edge of the bottom portion 23. That is, the multiple side wall portions 22 surround the bottom portion 23 and extend from the bottom portion 23 to the side opposite to the conveying surfaces 12 and 17. The container body 21 of this embodiment has four side wall portions 22. The four side wall portions 22 form an opening 21a enclosed by their respective +Z-side ends. The opening 21a is rectangular in plan view from the Z direction. In this embodiment, the opening 21a is square in plan view from the Z direction.

[0019] As shown in Figure 2, the opposing portion 23a protrudes from the -Z side surface of the bottom portion 23 toward the -Z side. That is, the opposing portion 23a faces outward from the container body 21. When the transport container 20 is placed on the first conveyor 11 or the second conveyor 16, the opposing portion 23a faces the first transport surface 12 or the second transport surface 17.

[0020] As shown in Figure 5, the opposing portion 23a of this embodiment has a rectangular outer shape in a plan view taken from the Z direction. The outer shape of the opposing portion 23a in a plan view is smaller than that of the opening 21a. The opposing portion 23a is located inside the opening 21a in a plan view. The opposing portion 23a of this embodiment has four corner portions 23b.

[0021] The shape of the opposing portion 23a preferably has symmetry around the centroid CT of the outer shape of the opposing portion 23a in a plan view. To explain in detail, consider the case where the opposing portion 23a is divided into four quadrants by a virtual straight line passing through the centroid CT and extending in the X or Y direction, as shown in Figure 5. In this case, the shape of the opposing portion 23a in one quadrant preferably has the shape obtained by rotating the opposing portion 23a in the adjacent quadrant by 90 degrees around the centroid CT. In this case, the outer shape of the opposing portion 23a in one quadrant preferably connects smoothly with the outer shape of the opposing portion 23a in the adjacent quadrant. In this embodiment, the opposing portion 23a has a square outer shape in a plan view.

[0022] When stacking two container bodies 21 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 container body 21 on the +Z side is housed inside the opening 21a of the container body 21 on the -Z side. In other words, the container bodies 21 can be stacked in a stable, side-by-side manner on top of other empty container bodies 21. In this embodiment, the opposing portion 23a is configured in a grid pattern by a group of reinforcing ribs 24.

[0023] As shown in Figure 6, the reinforcing rib group 24 is formed by multiple thin plate-like ribs standing on the -Z side from the -Z side surface of the bottom 23, so as to be connected to and / or intersect with each other. The reinforcing rib group 24 has the function of reinforcing the strength of the bottom 23. The reinforcing rib group 24 has a first rib group 25 and a second rib group 31.

[0024] As shown in Figure 5, the first rib group 25 is rectangular in shape in a plan view, 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 partition ribs 28. The first rib group 25 further has rib group corners 25a. The first rib group 25 further has a plurality of first masses 29.

[0025] The outer frame rib 26 is rectangular in shape, positioned furthest out from the center point CT in a plan view. In a plan view, the inner frame rib 27 is rectangular in shape and positioned on the center point CT side relative to the outer frame rib 26. In a plan view, the inner frame rib 27 surrounds the second rib group 31. The partition ribs 28 are provided between the outer frame ribs 26 and the inner frame ribs 27. Multiple partition ribs 28 are arranged at predetermined intervals along the extending direction of the outer frame ribs 26 and the inner frame ribs 27. The partition ribs 28 are perpendicular to the outer frame ribs 26 and the inner frame ribs 27. The rib group corner 25a is a corner of the first rib group 25, which is rectangular in shape. The rib group corner 25a corresponds to the corner 23b of the opposing part 23a.

[0026] The first mass 29 is rectangular in shape, enclosed by two adjacent partition ribs 28 in the extending direction of the outer frame rib 26 and inner frame rib 27, the outer frame rib 26, and the inner frame rib 27. That is, the first rib group 25 is divided into multiple first masses 29 by multiple partition ribs 28. The multiple first masses 29 are arranged along the extending direction of the outer frame rib 26 and inner frame rib 27. That is, the multiple first masses 29 are aligned along the -Z side surface of the bottom 23. In this case, the multiple partition ribs 28 partition the spaces between the multiple first masses 29 that are arranged along the extending direction of the outer frame rib 26 and inner frame rib 27. The partition rib 28 is an example of a partition.

[0027] The surface of the bottom 23, surrounded by multiple first masses 29, is positioned on the +Z side relative to the -Z end of the first rib group 25, as shown in Figure 6. In other words, the surface of the bottom 23, surrounded by multiple first masses 29, is recessed toward the bottom 23 side relative to the first rib group 25 of the opposing portion 23a. The first mass 29 is an example of a recess.

[0028] As shown in Figure 5, the second rib group 31 is formed on the center point CT side relative to the inner frame rib 27 in a plan 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 an intersection rib group 35. The second rib group 31 further has a plurality of second masses 36.

[0029] The first inclined rib 32 is a straight line extending in a first inclination direction that is inclined with respect to the X direction in a plan view. That is, the first inclined rib 32 extends in a direction inclined with respect to the conveying direction of the conveyed container 20 by the first conveyor 11 or the second conveyor 16. The inclination angle of the first inclination direction with respect to the X direction in this embodiment is 45 degrees. The first inclined rib 32 is formed to connect two edges of the inner frame rib 27. Multiple first inclined ribs 32 are arranged side by side in a direction perpendicular to the first inclination direction, with a predetermined distance between them. The second inclined rib 33 is a straight line that extends so as to intersect with the first inclined rib 32 in a plan view. That is, the second inclined rib 33 extends in a second inclination direction that intersects with the first inclination direction. In this embodiment, the second inclined rib 33 is perpendicular to the first inclined rib 32. The second inclined rib 33 is formed to intersect with the first inclined rib 32 and to connect the two edges of the inner frame rib 27. Multiple second inclined ribs 33 are arranged in the first inclination direction with a predetermined interval between them. The intersection 34 is the point 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.

[0030] Multiple intersecting rib groups 35 are formed corresponding to each of the multiple intersections 34. To explain in detail, let's consider one intersecting rib group 35 corresponding to one of the multiple intersections 34. One intersecting rib group 35 is cross-shaped, formed by one intersection 34, two first inclined ribs 32 around one intersection 34, and two second inclined ribs 33 around one intersection 34. The first inclined rib 32 of one intersecting rib group 35 is a part of the multiple first inclined ribs 32 that intersects one intersection 34. The second inclined rib 33 of one intersecting rib group 35 is a part of the multiple second inclined ribs 33 that intersects one intersection 34.

[0031] The second mass 36 is rectangular in shape, enclosed 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 masses 36 by multiple first inclined ribs 32 and multiple second inclined ribs 33. The multiple second masses 36 are arranged along either the first or second inclined direction. That is, the multiple second masses 36 are aligned along the -Z side surface of the bottom 23. In this case, the multiple first inclined ribs 32 and multiple second inclined ribs 33 partition the multiple second masses 36 that are arranged along either the first or second inclined direction. The first inclined ribs 32 and the second inclined ribs 33 are examples of partitions.

[0032] The surface of the bottom 23, surrounded by multiple second masses 36, is positioned on the +Z side relative to the -Z end of the second rib group 31, as shown in Figure 6. In other words, the surface of the bottom 23, surrounded by multiple second masses 36, is recessed toward the bottom 23 side relative to the second rib group 31 of the opposing portion 23a. The second masses 36 are an example of a recess.

[0033] <Cushioning sheet 40> The cushioning sheet 40 is a cushioning material that can be attached to the opposing portion 23a of the container body 21, as shown in Figures 2 and 4. When the transport container 20 is placed on the first conveyor 11 or the second conveyor 16, the cushioning sheet 40 comes into contact with the first roller 13 and / or the second roller 18.

[0034] As shown in Figure 4, the cushioning sheet 40 is attached to the container body 21 so as to overlap with the corner 23b of the opposing portion 23a (i.e., the corner 25a of the rib group 24) in a plan view. Four cushioning sheets 40 are attached to the container body 21 in this embodiment. The maximum length of the cushioning 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, described later, 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. When the transport container 20 placed on the conveyor group 10 is transported in the +X direction, it is preferable that the maximum length of the cushioning sheet 40 in the X direction is longer than the pitch length P of the rollers 13 and 18 of the conveyor group 10. In other words, it is preferable that the maximum length of the sheet portion 50 in the X direction is longer than the pitch length P of the rollers 13 and 18.

[0035] The cushioning sheet 40 is attached to the container body 21 so as not to be shifted in a direction away from the center point CT than the corner 23b of the opposing portion 23a in a plan view. In other words, the cushioning sheet 40 is attached to the container body 21 so as not to protrude outward from the opposing portion 23a in a plan view. That is, as shown in Figure 2, the cushioning sheet 40 is attached to the container body 21 so as not to protrude downstream of the opposing portion 23a in the transport direction of the transport container 20. In this way, the cushioning sheet 40 is positioned inside the opening 21a in a plan view.

[0036] The cushioning sheet 40 is formed from an elastomer. The elastomer is preferably, for example, nitrile rubber (NBR), fluororubber (FKM), acrylic rubber (ACM), silicone rubber, or urethane rubber. The rubber hardness of the elastomer is preferably 50A or higher. It is more preferable that the cushioning sheet 40 is formed from urethane rubber, which has excellent shock absorption properties. The cushioning 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 molded.

[0037] <Sheet section 50> The sheet portion 50 is a rectangular plate parallel to the XY plane, as shown in Figures 4 and 7. In this embodiment, the sheet portion 50 is approximately square in plan view from the Z direction, as shown in Figure 4. In this embodiment, the sheet portion 50 has four sheet corners 56, as shown in Figure 7. The sheet portion 50 further has a sheet center portion 58. The sheet center portion 58 coincides with the centroid in plan view. In plan view, as shown in Figure 4, 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.

[0038] The sheet portion 50 further has a first surface 50a and a second surface 50b. The first surface 50a faces in the -Z direction, as shown in Figure 4. That is, the first surface 50a is in contact with the conveyor group 10. The second surface 50b faces in the +Z direction, as shown in Figure 7. That is, the second surface 50b is in contact with the opposing portion 23a. In other words, the sheet portion 50 covers at least a portion of the opposing portion 23a, as shown in Figure 4.

[0039] As shown in Figure 7, the sheet portion 50 further includes a sheet edge portion 51, a first end portion 52, and a second end portion 54. The sheet edge 51 follows the outer periphery of the sheet portion 50, which is rectangular in plan view. The sheet edge 51 is spaced apart from the sheet center portion 58.

[0040] The first end 52 is the edge that is furthest from the center point CT of the opposing portion 23a in the X direction and extends in the Y direction when the cushioning sheet 40 is attached to the opposing portion 23a. In the cushioning sheet 40 where the first end 52 is located +X away from the center point CT, the first end 52 becomes the leading edge of the transport container 20 in the transport direction when it is transported in the +X direction.

[0041] The second end 54 is the edge that is furthest from the center point CT of the opposing portion 23a in the Y direction and extends in the X direction when the cushioning sheet 40 is attached to the opposing portion 23a. In the case of a cushioning sheet 40 where the second end 54 is located on the +Y side with respect to the center point CT, if the transport container 20 is transported in the +Y direction, the second end 54 becomes the leading edge of the transport container 20 in the transport direction.

[0042] The sheet corner 56 has a shape in which the corner of a rectangle is rounded into an arc when viewed from above. The edge of the sheet corner 56 smoothly connects the first end 52 and the second end 54. The length of the first end 52 in the X direction is shorter than the maximum length of the sheet portion 50 in the X direction. The length of the second end 54 in the Y direction is shorter than the maximum length of the sheet portion 50 in the Y direction.

[0043] <Protrusion group 60> As shown in Figure 7, the projection group 60 consists of multiple projections that protrude from the second surface 50b toward the +Z direction. Each projection constituting the projection group 60 is provided corresponding to the first mass 29 or the second mass 36 of the opposing portion 23a. Each projection constituting the projection group 60 is insertable into the first mass 29 or the second mass 36 when the cushioning sheet 40 is attached to the opposing portion 23a. At this time, each projection constituting the projection group 60 elastically deforms in response to insertion into the first mass 29 or the second mass 36, thereby applying a tightening force to the opposing portion 23a to prevent the cushioning sheet 40 from coming off the opposing portion 23a. The projection group 60 includes a first projection 70, a second projection 80, a third projection 90, and a fourth projection 100.

[0044] The first projection 70 corresponds to one of the multiple partition ribs 28. That is, the first projection 70 corresponds to one of two adjacent first masses 29. The first projection 70 in this embodiment has at least two wall-like projections 72. The wall-like projections 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 plan view from the Z direction, the two wall-like projections 72 overlap each of two adjacent first masses 29 that are sandwiched between the partition ribs 28. When the cushioning sheet 40 is attached to the opposing portion 23a, the two wall-like protrusions 72 each elastically deform in response to contact with the partition rib 28 and are inserted into the two adjacent first masses 29. At this time, the two wall-like protrusions 72 apply tension while sandwiching the partition rib 28. The two wall-like protrusions 72 are an example of a clamping portion that sandwiches the partition rib 28, which acts as a partition.

[0045] When a cushioning sheet 40 is attached to an opposing portion 23a having multiple partition ribs 28, it is preferable that the group of protrusions 60 has multiple first protrusions 70 corresponding to a portion of the multiple partition ribs 28. In this embodiment, the first protrusions 70 are provided corresponding to the partition ribs 28 that overlap both ends of the first end portion 52 in the Y direction and both ends of the second end portion 54 in the X direction. That is, in this embodiment, the first protrusions 70 are provided at each of the sheet corners 56, excluding the sheet corner 56 closest to the center point CT of the opposing portion 23a when the cushioning sheet 40 is attached to the opposing portion 23a.

[0046] The second projection 80 corresponds to one of the multiple second masses 36. In a plan view from the Z direction, the second projection 80 overlaps with one of the multiple second masses 36. In this embodiment, the second projection 80 is cylindrical and extends from the second surface 50b of the sheet portion 50 toward the +Z side. When the cushioning sheet 40 is attached to the opposing portion 23a, the second projection 80 is inserted into the second mass 36 while elastically deforming in response to contact with the first inclined rib 32 and the second inclined rib 33 that form the second mass 36. At this time, the second projection 80 applies tension to the first inclined rib 32 and the second inclined rib 33 that form the second mass 36. In other words, the second projection 80 has a tightening allowance with respect to the second mass 36.

[0047] When a cushioning sheet 40 is attached to an opposing portion 23a having a plurality of second masses 36, it is preferable that the group of protrusions 60 has a plurality of second protrusions 80 corresponding to a portion of the plurality of second masses 36.

[0048] The third projection 90 corresponds to one of the multiple intersecting rib groups 35. That is, the third projection 90 corresponds to one of the multiple second masses 36 adjacent to one of the multiple intersecting portions 34. The third projection 90 in this embodiment has at least four V-shaped projections 92. Each of the four V-shaped projections 92 corresponds to one of the four second masses 36 adjacent to one intersecting portion 34. Each V-shaped projection 92 extends from the second surface 50b of the sheet portion 50 in the +Z direction such that it forms a V shape that bends at the portion that contacts the intersecting portion 34 in a plan view. The two slanted edges of the V-shaped projection 92 in a plan view each extend along the extending direction of the first inclined rib 32 or the second inclined rib 33. In a plan view, the two V-shaped protrusions 92 adjacent to each other, flanking the first inclined rib 32, are inserted into the two adjacent second masses 36, respectively, while elastically deforming in response to contact with the first inclined rib 32 when the cushioning sheet 40 is attached to the opposing portion 23a. At this time, the two V-shaped protrusions 92 provide tension while flanking the first inclined rib 32. In a plan view, the two V-shaped protrusions 92 adjacent to each other, flanking the second inclined rib 33, are inserted into the two adjacent second masses 36, respectively, while elastically deforming in response to contact with the second inclined rib 33 when the cushioning sheet 40 is attached to the opposing portion 23a. At this time, the two V-shaped protrusions 92 provide tension while flanking the second inclined rib 33. Each of the four V-shaped protrusions 92 is an example of a clamping portion that sandwiches the first inclined rib 32 or the second inclined rib 33, which serves as a partition.

[0049] The third projection 90 in this embodiment is provided at the sheet corner 56 closest to the center point CT of the opposing portion 23a when the cushioning sheet 40 is attached to the opposing portion 23a. In other words, the third projection 90 and the plurality of first projections 70 in this embodiment are provided along the sheet edge 51 of the sheet portion 50.

[0050] The fourth projection 100 corresponds to either one of the multiple first inclined ribs 32 or the second inclined rib 33. That is, the fourth projection 100 corresponds to any two adjacent second masses 36 of the multiple second masses 36. The fourth projection 100 in this embodiment has at least two wall-like projections 102. The wall-like projections 102 extend along the extending direction of the first inclined rib 32 or the second inclined rib 33 and extend from the second surface 50b of the sheet portion 50 toward the +Z direction. In a plan view from the Z direction, the two wall-like projections 102 overlap with each of two adjacent second masses 36 that are sandwiched between the first inclined rib 32 or the second inclined rib 33. When the cushioning sheet 40 is attached to the opposing portion 23a, the two wall-like protrusions 102 are inserted into each of the two adjacent second masses 36, each undergoing elastic deformation in response to contact with the first inclined rib 32 or the second inclined rib 33. At this time, the two wall-like protrusions 102 apply tension while sandwiching the first inclined rib 32 or the second inclined rib 33. The two wall-like protrusions 102 are an example of a clamping portion that sandwiches the first inclined rib 32 or the second inclined rib 33 as a partition.

[0051] In this embodiment, the fourth projection 100 is preferably provided in the central portion 58 of the sheet. In this embodiment, the fourth projection 100 is preferably provided at a distance from each of the multiple sheet corners 56 in a plan view.

[0052] When multiple cushioning sheets 40 are attached to multiple corners 23b, it is preferable that the orientation of each cushioning sheet 40 is changed to match the phase of the center point CT of each corner 23b, thereby enabling alignment of the projection group 60 with respect to the opposing portion 23a. Specifically, the orientation of the cushioning sheet 40 attached to the upper right corner 23b in Figure 4 is preferably the same as the orientation of the cushioning sheet 40 attached to the upper left corner 23b in Figure 4 when rotated 90 degrees clockwise. In particular, when the opposing portion 23a has symmetry around the center point CT of the opposing portion 23a, it is preferable that the orientation of the cushioning sheet 40 is changed to match the phase of the center point CT of the corner 23b, thereby enabling alignment of the projection group 60 of the cushioning sheet 40 with respect to the opposing portion 23a.

[0053] (Mechanism of Action and Effects) Next, the functions and effects of the transport container 20 and the cushioning sheet 40 will be explained. The cushioning sheet 40 has a group of protrusions 60. The group of protrusions 60 elastically deforms in response to insertion into the first mass 29 or the second mass 36, thereby applying a tightening force to the opposing part 23a to prevent the cushioning sheet 40 from coming off. As a result, the cushioning sheet 40 can be easily attached to the opposing part 23a of the container body 21. Furthermore, the cushioning sheet 40 can be easily removed from the container body 21. Thus, the cushioning sheet 40 has excellent attachability to the container body 21. The group of protrusions 60 is integrally molded with the sheet portion 50. Therefore, the cushioning sheet 40 can reduce the number of parts required for the cushioning sheet to be attached to the container body 21. In other words, the cushioning sheet 40 provides a cushioning sheet that is excellent in attachability to the container body 21 and has a small number of parts.

[0054] The group of protrusions 60 has a first protrusion 70 that provides tension by sandwiching the partition rib 28 when attached to the opposing portion 23a. Therefore, the cushioning sheet 40 can improve the ease of attachment to the container body 21 having the partition rib 28. Furthermore, the third projection 90 and / or the fourth projection 100 corresponding to the first inclined rib 32 and / or the second inclined rib 33 can achieve the same effect as the first projection 70.

[0055] The group of protrusions 60 has a second protrusion 80 that has a tightening allowance for the second mass 36 and provides a tightening force. Therefore, the cushioning sheet 40 can improve the ease of attachment to the container body 21 having the second mass 36.

[0056] The projection group 60 has a third projection 90 that provides tension around the intersection 34, sandwiching the first inclined rib 32 and the second inclined rib 33. Depending on the configuration of the conveyor group 10, the conveying direction of the conveyor container 20 may be switched between the X direction, the Y direction, and directions inclined with respect to the X and Y directions (various directions including the inclination directions of the first inclined rib 32 and the second inclined rib 33). If the group of protrusions applies tension only to the first protrusion 70 that sandwiches only the partition rib 28 extending in the X direction, the X-direction component of that tension is small. In this case, when vibration or impact is applied as the transport container is transported in the X direction, the X-direction component of the tension is small, so there is a risk that the cushioning sheet attached to the transport container may come off the container body 21. In other words, if the group of protrusions applies tension only to the partition portion that extends in one direction, there is a risk that the cushioning sheet may come off the container body 21 when the transport container is transported in that one direction. On the other hand, the projection group 60 of the embodiment has a third projection 90 that provides tension by sandwiching the first inclined rib 32 and the second inclined rib 33, which extend in directions inclined with respect to the X and Y directions. Therefore, with the cushioning sheet 40, when the transport direction of the container body 21 can be switched in multiple directions, it is possible to prevent the cushioning sheet 40 from coming off the container body 21 during transport.

[0057] In particular, the third projection 90 provides tension by sandwiching the first inclined rib 32, which is inclined at 45 degrees with respect to the X direction, and the second inclined rib 33, which is perpendicular to the first inclined rib 32. Therefore, with the cushioning sheet 40, when the transport direction of the container body 21 can be switched between the X and Y directions, it is possible to prevent the cushioning sheet 40 from coming off the container body 21 during transport.

[0058] The group of protrusions 60 has a fourth protrusion 100 provided on the central portion 58 of the sheet. If the group of protrusions is provided only on the edge portion 51 of the sheet, there is a risk that the central portion 58 of the cushioning sheet 40 attached to the opposing portion 23a may lift up relative to the opposing portion 23a. In this case, the adhesion of the cushioning sheet 40 to the opposing portion 23a may be reduced, and the effectiveness of the cushioning sheet 40 may be reduced. On the other hand, by having the fourth protrusion 100, the cushioning sheet 40 can be attached to the container body 21 while applying tension to a part of the opposing portion 23a corresponding to the central portion 58 of the sheet. Therefore, the cushioning sheet 40 can suppress the lifting of the central portion 58 of the sheet from the opposing portion 23a.

[0059] The length of the first end 52 of the cushioning sheet 40 in the Y direction is shorter than the maximum length of the sheet portion 50 in the Y direction. When the transport container 20 is transported in the X direction by rollers 13 and 18 extending in the Y direction, the size of the contact surface between the first end 52 and the rollers 13 and 18 is smaller than when the length of the leading edge of the cushioning sheet in the Y direction is the maximum length of the sheet portion 50 in the Y direction. Therefore, the cushioning sheet 40 can reduce the noise generated between the cushioning sheet and the rollers 13 and 18 when the transport container 20 is transported in the X direction. The length of the second end 54 of the cushioning sheet 40 in the X direction is shorter than the maximum length of the sheet portion 50 in the X direction. When the transport container 20 is transported in the Y direction by rollers 13 and 18 extending in the X direction, the size of the contact surface between the second end 54 and the rollers 13 and 18 is smaller than when the length of the leading edge of the cushioning sheet in the Y direction is the maximum length of the sheet portion 50 in the X direction. Therefore, the cushioning sheet 40 can reduce the noise generated between the cushioning sheet and the rollers 13 and 18 when the transport container 20 is transported in the Y direction. Thus, the cushioning sheet 40 can reduce the noise generated between the transport container 20 and the rollers 13 and 18 during transport.

[0060] The rubber hardness of the elastomer constituting the cushioning sheet 40 is 50A or higher. Therefore, the cushioning sheet 40 can more effectively reduce the noise generated between the transport container 20 and the rollers 13 and 18 during transport.

[0061] The elastomer constituting the cushioning sheet 40 is urethane rubber. Urethane rubber has excellent shock absorption properties. Therefore, the cushioning sheet 40 can reduce the vibrations applied to the transport container 20 during transport.

[0062] The length of the cushioning sheet 40 in the X and Y directions is longer than the pitch length P of the rollers 13 and 18. Consider the case where the transport container 20 is transported on multiple rollers 13 and 18 along the direction in which the multiple rollers 13 and 18 are arranged. In this case, if the length of the cushioning sheet in the transport direction is shorter than the pitch length P, the cushioning sheet will not come into contact with two or more adjacent rollers 13 and 18 on the transport surfaces 12 and 17. Therefore, if a cushioning sheet with a length shorter than the pitch length P in the transport direction is attached to the container body 21, the transportability of the transport container on the roller conveyor will decrease. On the other hand, since the length of the cushioning sheet 40 in the conveying direction of the transport container 20 being transported on the roller conveyor is longer than the pitch length P, the cushioning sheet 40 comes into contact with two or more adjacent rollers 13, 18 on the transport surfaces 12, 17. Therefore, the cushioning sheet 40 can maintain the transportability of the transport container 20 on the roller conveyor.

[0063] The cushioning sheet 40 is attached to the container body 21 so as not to protrude downstream of the conveying direction of the conveying container 20 beyond the opposing portion 23a. If the cushioning sheet of a conveying container being transported on a roller conveyor protrudes downstream of the conveying direction of the conveying container beyond the opposing portion 23a, there is a risk that the leading edge of the sheet portion 50 in the conveying direction may peel off upon contact with the rollers 13 and 18. On the other hand, if the leading edge of the sheet portion 50 in the conveying direction is in close contact with the opposing portion 23a by the group of protrusions 60, as in the case of the cushioning sheet 40, it becomes less likely to peel off even when in contact with the rollers 13 and 18. Therefore, the cushioning sheet 40 can suppress the peeling off of the cushioning sheet due to contact with the rollers 13 and 18 during transport on a roller conveyor.

[0064] The transport container 20 has a cushioning sheet 40 made of elastomer. As shown in Figure 8, when the container body 21 is transported on the roller conveyor in direct contact with the rollers 13 and 18, noise is generated due to interference between the rollers and the transport container. Therefore, the transport container 20 can reduce the noise generated between the rollers and the transport container during transport on the roller conveyor.

[0065] In the transport container 20, multiple cushioning sheets 40 are attached so as to overlap with multiple corners 23b of the opposing portion 23a. Therefore, the transportability of the transport container can be maintained. In addition, the length of the sheet portion 50 of the cushioning sheet 40 in the X and Y directions is less than 50% of the length of the opposing portion 23a in the X and Y directions. Therefore, the handling of the cushioning sheet 40 when attaching it to the transport container 20 can be improved.

[0066] In the transport container 20, the cushioning sheet 40 is attached to the container body 21, which has an opening 21a and an opposing portion 23a, so as not to protrude from the opposing portion 23a in a plan view. Therefore, with the transport container 20, the cushioning sheet 40 can be attached and stacked stably on top of other empty transport containers 20 (or container body 21).

[0067] As described above, an embodiment of the present invention has been explained as an example, but the present invention is not limited to the above-described embodiment, and various modifications, changes, and improvements are possible within the scope of the technical idea of ​​the present invention.

[0068] The cushioning sheet 40 is attached to the container body 21 by inserting the group of protrusions 60 into the first compartment 29 or the second compartment 36. However, the cushioning sheet according to this disclosure may also be attached to the container body 21 by means of a group of protrusions and an adhesive member such as double-sided tape, as shown in Figure 9. The cushioning sheet 140 shown in Figure 9, compared to the cushioning sheet 40, further includes double-sided tape 111 and double-sided tape 112. The double-sided tape 111 is provided on the second surface 50b of the sheet portion 50 so as to be along the sheet edge 51 on the first end 52 side. The double-sided tape 112 is provided on the sheet portion 50 so as to be along the sheet edge 51 on the second end 54 side. Each of the double-sided tapes 111 and 112 has a first adhesive surface (not shown) and a second adhesive surface 111b and 112b, respectively. The first adhesive surface can be attached to the sheet portion 50. The second adhesive surfaces 111b and 112b can be attached to the container body 21. Each of the double-sided tapes 111 and 112 is attached to the sheet portion 50 so as not to overlap with the group of protrusions 60 in a plan view. The double-sided tapes 111 and 112 are examples of adhesive members. The cushioning sheet 140 can improve its adhesion to the container body 21 by having the double-sided tapes 111 and 112. The adhesive member according to this disclosure may be provided on the entire surface 50b of the sheet portion 50, provided that it does not overlap with the group of protrusions 60 in a plan view.

[0069] In the transport container 20, the cushioning sheet 40 is attached so that it overlaps with the multiple corners 23b of the opposing portion 23a in a plan view. However, the transport container according to this disclosure may also have a configuration in which the transport sheet is further attached to the central part of the opposing portion 23a, as shown in the transport container 240 in Figure 10. The central part of the opposing portion 23a is a part of the opposing portion 23a that is separated from each of the multiple corners 23b, and is a part around the center point CT. That is, the transport container according to this disclosure may have a configuration in which at least a part of the sheet portion of the multiple cushioning sheets is attached so that it overlaps with the central part of the opposing portion 23a in a plan view. If the cushioning sheet is attached only to multiple corners 23b of the opposing portion 23a, there is a risk that the central portion of the opposing portion 23a may deform and sink under its own weight. In particular, when an item is placed in the transport container 20, there is a risk that the central portion of the opposing portion 23a may deform and sink under the weight of the item. On the other hand, if at least a part of the sheet portion according to this disclosure is attached so as to overlap the central portion of the opposing portion 23a in a plan view, as in the transport container 240, the deformation of the central portion of the opposing portion 23a is suppressed because it is supported by the sheet portion. Therefore, the transport container 240 can suppress deformation of the central portion of the container body 21.

[0070] The sheet portion 50 of the cushioning sheet 40 has sheet corners 56 in which the rectangular corners are rounded into an arc shape when viewed from above. However, the sheet portion according to this disclosure is not limited to having a shape in which the rectangular corners (sheet corners) are rounded into an arc shape, as long as the length in the width direction perpendicular to the transport direction of the leading edge is shorter than the maximum length in the width direction of the sheet portion. The sheet portion according to this disclosure may have a shape in which the rectangular corner (sheet corner) on the downstream side in the conveying direction is chamfered so as to be inclined linearly with respect to the conveying direction in a plan view, as shown in Figures 10, 11, and 12. In other words, the sheet portion according to this disclosure may have a polygonal shape other than a rectangle in a plan view. Furthermore, the sheet portion according to this disclosure may have a rectangular shape in a plan view without rounded or chamfered corners. The sheet portion relating to this disclosure may be circular in plan view, as shown in Figure 13.

[0071] The sheet portion 50 is assumed to be approximately square in plan view. That is, the sheet portion 50 has a shape that is point-symmetric with respect to the center point (central center) of the sheet portion 50 in plan view. However, the sheet portion according to this disclosure does not have to have a point-symmetric shape. The sheet portion according to this disclosure may have a shape that is line-symmetric with respect to the center line CL of the sheet portion 450, for example, as shown in the cushioning sheet 440 in Figure 12. In this case, when aligning the projection group 60 with respect to the opposing portion 23a by changing the orientation of the cushioning sheet 440 in accordance with the phase of each corner portion 23b with respect to the center point CT, the orientation of the cushioning sheet 440 with respect to the corner portion 23b can be easily determined by visual inspection. Furthermore, the sheet corner according to this disclosure that is closest to the center point CT of the opposing portion 23a may have a different shape from the other sheet corners. The sheet corner according to this disclosure that is furthest from the center point CT of the opposing portion 23a may have a different shape from the other sheet corners.

[0072] The inclination angle of the first inclined rib 32 with respect to the X direction in the first inclination direction is assumed to be 45 degrees. However, the inclination angle of the first inclination direction with respect to the X direction in this disclosure does not have to be 45 degrees. The second inclined rib 33 is perpendicular to the first inclined rib 32. However, the second inclined rib according to this disclosure does not have to be perpendicular to the first inclined rib 32, as long as it intersects with it. The second rib group 31 comprises a plurality of first inclined ribs 32 and a plurality of second inclined ribs 33. However, the second rib group according to this disclosure may further have one or more third inclined ribs. The third inclined rib extends in a different direction from the first and second inclined ribs. The intersecting rib group 35 is described as being cross-shaped. However, the intersecting rib group according to this disclosure is not limited to being cross-shaped. The intersecting rib group according to this disclosure may be formed by a plurality of rib members extending along a plurality of diagonals in a hypothetical polygon other than a quadrilateral. The intersecting rib group according to this disclosure may be formed by an intersection provided as the centroid of a hypothetical polygon other than a quadrilateral, and a plurality of rib members extending radially from the intersection toward each vertex. The intersecting rib group according to this disclosure may be formed by a plurality of rib members forming a honeycomb grid.

[0073] In the embodiment, the first projection 70 and the third projection 90 are provided on the sheet corner 56 of the cushioning sheet 40, respectively. However, the first projection according to this disclosure may be provided at a location other than the sheet corner 56, as long as it corresponds to one of the plurality of partition ribs 28. The third projection according to this disclosure may be provided at a location other than the sheet corner 56, as long as it corresponds to one of the plurality of intersecting rib groups 35. In the embodiment, the fourth projection 100 is preferably provided in the central portion 58 of the cushioning sheet 40. However, the fourth projection according to this disclosure may be provided in a location other than the central portion 58 of the sheet, as long as it corresponds to any two adjacent second squares 36 among the plurality of second squares 36.

[0074] The transport container 20 is transported on a fixed conveyor group 10 having a plurality of rollers 13, 18. However, the conveyor according to this disclosure is not limited to a fixed roller conveyor. The conveyor according to this disclosure may be an AGV (Automatic Guided Vehicle) or an AMR (Autonomous Mobile Robot), as long as it has a transport surface with a plurality of rollers on which a transport container can be placed. [Examples]

[0075] To demonstrate the noise reduction effect of the cushioning sheet according to this disclosure, evaluations were conducted when the transport containers of the examples and comparative examples according to this disclosure were transported in one direction along the horizontal on a roller conveyor. In the evaluation, the noise during transport was measured and the vibration level of the transport container was evaluated while changing the material, rubber hardness, thickness, and corner shape of the cushioning sheet according to the example. In the noise evaluation, the noise level (dB) was measured three times under the same conditions, and the average value of the three obtained noise levels (dB) was calculated. In the vibration level evaluation, the vibration state of the transport container in the example was qualitatively evaluated using the vibration state of the transport container in the comparative example described later as a reference. As a comparative example to the given example, we evaluated the noise level during transport and the vibration level of the transported container when no cushioning sheet was attached to the container body. The container body is approximately square in shape, with sides measuring 485 mm in length when viewed from above. The height of the side walls of the container body is 170 mm. The opposing section is approximately square in shape with a side length of 465 mm in a plan view. The height of the opposing section is 10 mm. The opposing section is configured in a grid pattern by a group of reinforcing ribs, similar to the embodiment. Each of the four corners of the opposing section is fitted with four cushioning sheets. The cushioning sheet has a roughly square (rectangular) shape with sides measuring 150 mm in length when viewed from above. The pitch length between the rollers of the roller conveyor is 100 mm. When the shape of the cushioning sheet in plan view is rectangular and the shape of the corners of the cushioning sheet are right angles, the length of the leading edge of the cushioning sheet in the width direction in the transport direction is equal to the maximum length of the cushioning sheet in the width direction. Figure 14(a) is a table showing the specifications of the cushioning sheets used in each example of the evaluation, and the evaluation results of noise and vibration levels in each example and comparative example. Figure 14(b) is a graph showing the evaluation results of noise in each example and comparative example.

[0076] From the evaluation results of Examples 2-10, it can be confirmed that when the rubber hardness of the elastomer constituting the cushioning sheet is 50A or higher, the noise during transport is reduced by 30% or more compared to the case without the cushioning sheet (comparative example). In particular, from the evaluation results of Example 9, it can be confirmed that the noise during transport is reduced the most compared to the comparative example when the corners of the sheet are chamfered. Specifically, the noise during transport in Example 9 is reduced by 35% compared to the case without the cushioning sheet.

[0077] From the evaluation results of Examples 3-10, it can be confirmed that when a cushioning sheet is formed from urethane rubber, the vibration level is reduced compared to when no cushioning sheet is installed (comparative example) and when a cushioning sheet is formed from silicone rubber (Examples 1 and 2). In particular, when urethane rubber with a rubber hardness of 85A is used, it can be confirmed that the vibration level is significantly reduced compared to the comparative example. This is due to the excellent shock absorption properties of urethane rubber. [Explanation of Symbols]

[0078] 10 Conveyor Groups 11. First conveyor 13. Laura 1 16. Second conveyor 18. The Second Laura 20 Transport containers 21 Container body 21a opening 22 Side wall section 23 Bottom 23a Opposing section 23b corner 24 Reinforcement rib group 25. First rib group 25a Corner of the rib group 26 Outer frame ribs 27 Inner frame rib 28. Partition ribs (an example of a partition section) 29. First square (an example of a recess) 29a Corner square 31 Second rib group 32 First Inclined Rib 33. Second inclined rib 34 Intersection 35 Intersecting rib group 36. Second mass (an example of a recess) 40 cushioning sheets 50 Seat section 50a First surface 50b Second side 51 Sheet edge 52 First end 54 Second end 56. Corner of the sheet 58 Center of the seat 60 protrusion group 70 First projection 80 Second projection 90 Third projection 100 The fourth projection

Claims

1. A cushioning sheet that can be attached to a container body of a transport container, the container body having a first direction perpendicular to the bottom and facing the first direction which is the outside of the container body, and a plurality of recesses that are recessed relative to the opposing portion, A sheet portion made of elastomer is provided so as to cover at least a part of the opposing portion, and has a first surface facing the first direction and a second surface facing the opposing portion side. A group of protrusions provided to protrude from the second surface and integrally molded with the sheet portion, comprising a group of protrusions that can be inserted corresponding to the plurality of recesses, A cushioning sheet having [a certain feature].

2. At least some of the plurality of recesses are arranged along the direction of arrangement along the second surface, The container body has partitions that separate the spaces between the plurality of recesses arranged in the direction of the arrangement, The cushioning sheet according to claim 1, wherein the group of protrusions has a first protrusion that provides tension on either side of the partition.

3. The cushioning sheet according to claim 1 or 2, wherein the group of protrusions has a second protrusion that provides a tightening allowance for at least a portion of the plurality of recesses and provides a tightening force.

4. The opposing portion is a group of reinforcing ribs formed to stand up from the bottom of the container body toward the first direction, A first inclined rib extending in a first inclined direction that is inclined with respect to the transport direction of the transport container within the plane along the bottom, A second inclined rib extending in a second inclined direction intersecting the first inclined direction within the plane along the bottom, The intersection where the first inclined rib and the second inclined rib intersect, It has a group of reinforcing ribs, The cushioning sheet according to any one of claims 1 to 3, wherein the group of protrusions has a third protrusion that provides tension by sandwiching the first inclined rib and the second inclined rib around the intersection.

5. The transport direction is either the front-to-back direction of the transport container or the left-to-right direction perpendicular to the front-to-back direction. The inclination angle of the first inclined rib with respect to the front-rear direction is 45 degrees. The cushioning sheet according to claim 4, wherein the second inclined rib is perpendicular to the first inclined rib.

6. The sheet portion has a central portion and a peripheral portion. At least some of the aforementioned plurality of protrusions are provided along the sheet edge of the sheet portion, The cushioning sheet according to any one of claims 1 to 5, wherein the group of protrusions has a fourth protrusion provided in the center of the sheet.

7. The cushioning sheet according to any one of claims 1 to 6, comprising an adhesive member having a first adhesive surface that can be attached to the sheet portion and a second adhesive surface that can be attached to the container body.

8. The sheet portion has a leading edge relative to the transport direction of the transport container, The cushioning sheet according to any one of claims 1 to 7, wherein the length of the tip portion in the width direction perpendicular to the transport direction is shorter than the maximum length of the sheet portion in the width direction.

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

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

11. The transport container is transported on a conveyor that includes a plurality of rollers arranged in the transport direction of the transport container at predetermined pitch length intervals, while in contact with the rollers. The cushioning sheet according to any one of claims 1 to 10, wherein the length of the sheet portion in the conveying direction is longer than the pitch length.

12. The transport container is transported on a conveyor that includes a plurality of rollers arranged in the transport direction of the transport container at predetermined pitch length intervals, while in contact with the rollers. The cushioning sheet according to any one of claims 1 to 11, wherein the sheet portion is attached to the container body so as not to protrude further downstream in the transport direction of the transport container than the opposing portion.

13. A transport container that is transported on a conveyor including a plurality of rollers arranged in the transport direction, while in contact with the rollers, The container body, The conveying surface of the conveyor and the opposing part facing it, Multiple recesses that are recessed relative to the opposing portion, A container body having, A cushioning sheet according to any one of claims 1 to 12, which can be attached to the container body, A transport container.

14. Having multiple cushioning sheets, The opposing portion has a plurality of corners corresponding to the plurality of cushioning sheets, The respective lengths in the longitudinal and width directions of the sheet portions of the plurality of cushioning sheets are less than 50% of the lengths in the longitudinal and width directions of the opposing portions. The transport container according to claim 13, wherein the plurality of cushioning sheets are mounted so as to overlap with the plurality of corners of the opposing portion.

15. The transport container according to claim 13 or 14, wherein the cushioning sheet is attached such that at least a portion of the sheet overlaps with the central portion of the opposing portion in a plan view.

16. The container body is The bottom and, A plurality of side wall portions surround the bottom portion and extend from the bottom portion to the side opposite to the conveying surface, An opening surrounded by the ends of multiple side walls opposite to the bottom side, It has, The opposing portion protrudes from the bottom portion toward the side opposite to the side wall portion and is formed on the inside of the opening in a plan view. The transport container according to any one of claims 13 to 15, wherein the cushioning sheet is attached so as not to protrude from the opposing portion in a plan view.

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