cushioning material

Abstract

To provide a buffer member capable of continuously exhibiting a buffering effect against multiple impacts and that can be easily formed.SOLUTION: There is provided a buffer member with a cylindrical shape having a cylindrical axis extending in a first direction, the buffer member including: a cylindrical buffer portion that contacts a packaged item from one side in a second direction perpendicular to the first direction and buffers a first impact applied from the second direction by deforming itself; and an inner buffer portion that is placed in an internal space of the cylindrical buffer portion, and that buffers a second impact by deforming itself when the second impact is applied from the second direction after the first impact, with the cylindrical buffer portion deformed, in which the inner buffer portion is arranged such that a transverse grain direction of a center core of a corrugated cardboard sheet becomes the second direction.SELECTED DRAWING: Figure 6

Description

Technical Field

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[0001] The present invention relates to a buffer member.

Background Art

[0002] Conventionally, a buffer member for buffering an impact on an object to be packaged in a packaging case has been known. For example, the buffer member of Patent Document 1 is formed from a pulp mold material using a mold by a pulp molding method.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The buffer member of Patent Document 1 has a hollow protrusion. The protrusion has a cylindrical portion extending in the normal direction from the contact surface with the object to be packaged. On the outer peripheral portion of the cylindrical portion, uneven portions that are alternately continuous along the normal direction are formed. In Patent Document 1, the buffer member is easily expandable and contractible. That is, in Patent Document 1, a buffering effect can be continuously exerted against a plurality of impacts.

[0005] However, the buffer member of Patent Document 1 is formed by combining two pulp moldings. Therefore, for an operator forming the buffer member, the number of parts of the buffer member is large (the work of combining two pulp moldings is required), which is troublesome.

[0006] The present invention has been made to solve the above problems, and an object thereof is to provide a buffer member that can continuously exert a buffering effect against a plurality of impacts and can be easily formed.

Means for Solving the Problems

[0007] To achieve the above objective, a cushioning member according to one aspect of the present invention is a cushioning member formed by folding a single corrugated cardboard sheet, and is cylindrical having a cylindrical shaft extending in a first direction, and comprises a cylindrical cushioning portion that contacts the packaged object from one side in a second direction perpendicular to the first direction and cushions a first impact applied from the second direction by deforming itself, and an inner cushioning portion arranged in the internal space of the cylindrical cushioning portion, which, after the first impact, when the cylindrical cushioning portion is deformed and a second impact is applied from the second direction, cushions the second impact by deforming itself. The inner cushioning portion is arranged such that the transverse grain direction of the core of the corrugated cardboard sheet is the second direction. [Effects of the Invention]

[0008] The present invention provides a cushioning member that can continuously exhibit a cushioning effect against multiple impacts and can be easily formed. [Brief explanation of the drawing]

[0009] [Figure 1] This is a perspective view of a cushioning member according to one embodiment. [Figure 2] This is a perspective view showing a packaged item protected by a cushioning member according to one embodiment. [Figure 3] This is a schematic diagram of a corrugated cardboard sheet forming a cushioning member according to one embodiment. [Figure 4] This is a perspective view of a first buffer member according to one embodiment. [Figure 5] Figure 4 is a perspective view showing the internal structure of the first buffer member. [Figure 6] Figure 4 is a cross-sectional view of the first buffer member, obtained by cutting it in the YZ plane. [Figure 7] This is a diagram illustrating the collapse of a corrugated cardboard sheet. [Figure 8] This is a diagram illustrating the buckling of corrugated cardboard sheets. [Figure 9] This diagram schematically shows the state when a first impact is applied to the first cushioning member according to one embodiment. [Figure 10] Perspective view of the cardboard sheet of the first buffer member according to an embodiment, unfolded. [Figure 11] Perspective view of the second buffer member according to an embodiment. [Figure 12] Schematic diagram showing the internal structure of the second buffer member shown in FIG. 11. [Figure 13] Cross-sectional view of the second buffer member shown in FIG. 11, cut along the YZ plane. [Figure 14] Cross-sectional view of the second buffer member shown in FIG. 11, cut along the XY plane. [Figure 15] Perspective view of the cardboard sheet of the second buffer member according to an embodiment, unfolded.

Mode for Carrying Out the Invention

[0010] Hereinafter, referring to FIGS. 1 to 15, the buffer member 10 according to an embodiment of the present invention will be described. In the following description, the X direction in the figure is defined as the left-right direction, the Y direction is defined as the front-back direction, and the Z direction is defined as the up-down direction. Note that the X direction corresponds to the "first direction", the Y direction corresponds to the "second direction", and the Z direction corresponds to the "third direction".

[0011] Also, among the X direction, the +X side is defined as the right, and the -X side is defined as the left. Among the Y direction, the +Y side is defined as the front, and the -Y side is defined as the back. Among the Z direction, the +Z side is defined as the top, and the -Z side is defined as the bottom.

[0012] <Overall Configuration> As shown in FIGS. 1 and 2, the buffer member 10 is stored in the packaging case 2000 together with the object to be packaged 1000. The buffer member 10 protects the object to be packaged 1000 inside the packaging case 2000. By arranging the buffer member 10 inside the packaging case 2000, the impact on the object to be packaged 1000 is buffered. The object to be packaged 1000 is, for example, a printer. Although not shown in the figure, another buffer member is also arranged in the packaging case 2000, separate from the buffer member 10.

[0013] The packaging case 2000 is formed of a cardboard sheet. The packaging case 2000 has an opening 2000A on the upper side. The buffer member 10 is inserted into and removed from the packaging case 2000 through the opening 2000A. That is, the direction of inserting and removing the buffer member 10 with respect to the packaging case 2000 is the vertical direction. Similarly, the object to be packaged 1000 is inserted into and removed from the packaging case 2000 through the opening 2000A.

[0014] The buffer members 10 are respectively arranged on the upper side and the lower side. Although details will be described later, each of the upper and lower buffer members 10 includes a cylindrical buffer portion 1 and an inner buffer portion 2. The upper buffer member 10 buffers the impact on the upper front side of the object to be packaged 1000. The lower buffer member 10 buffers the impact on the lower front side of the object to be packaged 1000.

[0015] In the following description, when it is necessary to distinguish between the upper and lower buffer members 10, the upper buffer member 10 is denoted by reference numeral 110 and referred to as the first buffer member 110, and the lower buffer member 10 is denoted by reference numeral 210 and referred to as the second buffer member 210. Also, the cylindrical buffer portion 1 of the first buffer member 110 is denoted by reference numeral 11 and referred to as the first cylindrical buffer portion 11, and the inner buffer portion 2 of the first buffer member 110 is denoted by reference numeral 12 and referred to as the first inner buffer portion 12. The cylindrical buffer portion 1 of the second buffer member 210 is denoted by reference numeral 21 and referred to as the second cylindrical buffer portion 21, and the inner buffer portion 2 of the second buffer member 210 is denoted by reference numeral 22 and referred to as the second inner buffer portion 22.

[0016] Here, the buffer member 10 is formed by bending a single cardboard sheet 100 (see FIGS. 10 and 15). In other words, the cylindrical buffer portion 1 and the inner buffer portion 2 are formed by bending a single cardboard sheet 100. The forming direction of the buffer member 10 (the method of bending the cardboard sheet 100) will be described later.

[0017] The corrugated cardboard sheet 100 used in the cushioning member 10 is a sheet material having a core 101 and a pair of liners 102, as shown in Figure 3. The core 101 is a corrugated sheet. The pair of liners 102 includes a front liner and a back liner. Each of the pair of liners 102 is a flat sheet. The core 101 is sandwiched between the pair of liners 102. The core 101 and the pair of liners 102 are bonded together. That is, the cylindrical cushioning portion 1 and the inner cushioning portion 2 are each formed from a sheet material made by bonding the core 101 and the pair of liners 102 together.

[0018] In the corrugated cardboard sheet 100, the longitudinal direction is the paper width direction of the core 101 and the direction of the corrugations formed on the core 101. Also, in the corrugated cardboard sheet 100, the transverse direction is the flow direction of the core 101 and is perpendicular to the longitudinal direction. In other words, the transverse direction is perpendicular to the longitudinal direction of the tubular structure formed by the core 101 and the pair of liners 102.

[0019] <Detailed configuration of the cushioning material> First, the first cylindrical buffer portion 11 and the first inner buffer portion 12 will be described with reference to Figures 4 to 6.

[0020] The first cylindrical cushioning portion 11 is cylindrical in shape, having a cylindrical axis extending in the left-right direction. The first cylindrical cushioning portion 11 can be bent into a hollow rectangular tube shape. When the first cushioning member 110 is housed in the packaging case 2000 together with the packaged item 1000, one of the four outer walls of the first cylindrical cushioning portion 11 faces the packaged item 1000 and contacts the front upper side of the packaged item 1000.

[0021] The first cylindrical buffer portion 11 has a first wall portion 111 and a second wall portion 112 that are arranged opposite to each other in the front-rear direction. The first cylindrical buffer portion 11 also has a third wall portion 113 and a fourth wall portion 114 that are arranged opposite to each other in the vertical direction.

[0022] The first wall 111 is positioned on the front side. The second wall 112 is positioned on the rear side. The second wall 112 faces the packaged item 1000 in the front-to-back direction and contacts the packaged item 1000 from the front side. The third wall 113 is positioned on the upper side, and the fourth wall 114 is positioned on the lower side.

[0023] The first internal buffer portion 12 is located within the internal space of the first cylindrical buffer portion 11. Specifically, the first internal buffer portion 12 is located within the space enclosed by the first wall portion 111, the second wall portion 112, the third wall portion 113, and the fourth wall portion 114. In other words, the first cylindrical buffer portion 11 has the first internal buffer portion 12 within its internal space. To put it another way, the first cylindrical buffer portion 11 has a core 101 as a corrugated sheet within its internal space.

[0024] The first inner cushioning section 12 is arranged such that the transverse grain direction of the core 101 of the first inner cushioning section 12 is in the front-to-back direction. In other words, the first inner cushioning section 12 has a core 101 whose transverse grain direction is in the front-to-back direction. To put it another way, a portion of the corrugated cardboard sheet 100 arranged as the first inner cushioning section 12 in the internal space of the first cylindrical cushioning section 11 has the transverse grain direction of the core 101 in the front-to-back direction.

[0025] Furthermore, the first internal cushioning section 12 is a laminated block formed by stacking multiple portions of the corrugated cardboard sheet 100 in the vertical direction. The laminated block as the first internal cushioning section 12 is formed by folding a portion of the corrugated cardboard sheet 100 in a zigzag pattern. In other words, the first internal cushioning section 12 has multiple cores 101 that overlap in the vertical direction. For example, the first internal cushioning section 12 is a laminated block made by stacking three corrugated cardboard sheets 100, and has three cores 101 that overlap in the vertical direction.

[0026] The portion of the corrugated cardboard sheet 100 that forms the first inner cushioning section 12 is arranged substantially parallel to the third wall section 113 and the fourth wall section 114, respectively, and is positioned between the third wall section 113 and the fourth wall section 114 in the vertical direction. In other words, the core 101 of the first inner cushioning section 12 is positioned between the third wall section 113 and the fourth wall section 114 in the vertical direction. The upper surface of the uppermost layer of the first inner cushioning section 12 may or may not be in contact with the inner surface of the third wall section 113 (which in other words is the top surface). Furthermore, the lower surface of the lowest layer of the first inner cushioning section 12 may or may not be in contact with the inner surface of the fourth wall section 114 (which in other words is the bottom surface).

[0027] Furthermore, the first internal buffer portion 12 is positioned at a distance from the inner surface of the first wall portion 111 in the front-rear direction. In other words, a gap G is provided between the front end of the first internal buffer portion 12 and the inner surface of the first wall portion 111. To put it another way, the core 101 of the first internal buffer portion 12 is positioned at a distance from the inner surface of the first wall portion 111 in the front-rear direction. When multiple cores 101 forming the first internal buffer portion 12 are stacked in the vertical direction, all of the cores 101 forming the first internal buffer portion 12 are positioned at a distance from the inner surface of the first wall portion 111 in the front-rear direction.

[0028] In this embodiment, the above configuration makes it possible to obtain a first cushioning member 110 that can continuously provide a cushioning effect against multiple impacts.

[0029] Specifically, when a first impact is applied from the front of the first cylindrical buffer portion 11, the third wall portion 113 and the fourth wall portion 114 collapse in the front-rear direction, thereby buffering the first impact from the front. In other words, the first cylindrical buffer portion 11 buffers the first impact applied from the front by deforming itself. The third wall portion 113 and the fourth wall portion 114 may buckle when subjected to the first impact.

[0030] When the first impact is applied, the first inner cushioning portion 12 is positioned at a distance from the inner surface of the first wall portion 111 in the front-rear direction, and therefore does not function as a cushioning material. In other words, the first inner cushioning portion 12 does not deform (does not collapse). For example, when the first cylindrical cushioning portion 11 is subjected to an impact from the front side once or more times, the first wall portion 111 comes into contact with the first inner cushioning portion 12. As a result, the first cylindrical cushioning portion 11 collapses in the front-rear direction, and from then on, the first inner cushioning portion 12 can exert its cushioning effect.

[0031] The first internal buffer 12 buffers a second impact that is applied from the front after the first impact. Specifically, after the first impact has been applied once or more times and it has come into contact with the first wall portion 111, that is, after the first cylindrical buffer 11 has deformed, when a second impact is applied from the front while the first cylindrical buffer 11 is in a deformed state, the first internal buffer 12 buffers the second impact by deforming itself.

[0032] Here, the direction of the impact applied to the first internal cushioning section 12 is approximately the same as the transverse grain direction of the core 101 that makes up the first internal cushioning section 12. That is, the first internal cushioning section 12 is subjected to an impact such that the core 101 is crushed in the transverse grain direction. When such an impact is applied to the first internal cushioning section 12, the core 101 that makes up the first internal cushioning section 12 deforms to contract in the front-rear direction (transverse grain direction), but as long as the core 101 is not completely crushed in the front-rear direction, the first internal cushioning section 12 can continue to exert its cushioning effect. As a result, the first cushioning member 110 continuously exerts its cushioning effect against multiple impacts.

[0033] However, if the first internal cushioning section 12 deforms into an unintended shape, it will cease to function as a cushioning material. Specifically, if the first internal cushioning section 12 is crushed in the front-rear direction (collapses), that is, if it undergoes deformation as shown in Figure 7, the first internal cushioning section 12 will continue to provide cushioning effects. On the other hand, if the first internal cushioning section 12 is bent (buckles), that is, if it undergoes deformation as shown in Figure 8, the cushioning effect of the first internal cushioning section 12 will decrease thereafter. In some cases, the first internal cushioning section 12 may cease to function as a cushioning material.

[0034] Here, the first cylindrical buffer section 11 deforms due to the first impact, but the way it deforms (bends) varies. For example, the first cylindrical buffer section 11 may bend in two, either inward or outward. In some cases, it may deform into the shape shown in the lower figure from the upper figure in Figure 9. Note that Figure 9 is a schematic diagram. In Figure 9, the first cylindrical buffer section 11 is shown with a thick line, and the first inner buffer section 12 is shown with a hatched rectangular shape. In Figure 9, the upper figure shows the state of the first cylindrical buffer section 11 immediately before the first impact is applied, and the lower figure shows the state of the first cylindrical buffer section 11 after the first impact is applied.

[0035] As shown in Figure 9, the first cylindrical buffer portion 11 may bend, mainly at its front, when the first impact is applied. When the first cylindrical buffer portion 11 deforms to this shape, the first inner buffer portion 12 is maintained sandwiched between the third wall portion 113 and the fourth wall portion 114 in the vertical direction.

[0036] As a result, when a second impact is applied, the first cylindrical buffer portion 11 contacts the surface of the liner 102, which is bonded to the core 101 of the first inner buffer portion 12, within its internal space, thereby restricting the deformation of the first inner buffer portion 12 in a direction different from the front-rear direction. In other words, when a second impact is applied, even if the first inner buffer portion 12 tries to deform in a direction that bends upward (or downward), the third wall portion 113 and the fourth wall portion 114 are present on the upper and lower sides of the first inner buffer portion 12, respectively, thus restricting the deformation of the first inner buffer portion 12 upward and downward.

[0037] When a second impact is applied, the deformation of the first internal cushioning section 12 in a direction different from the front-to-back direction is restricted, thereby causing the first internal cushioning section 12 to deform (crush) in the front-to-back direction. As a result, when another impact is applied from the front after the second impact, the first internal cushioning section 12 can exert its cushioning effect.

[0038] The formation direction of the first cushioning member 110 (the method of folding the corrugated cardboard sheet 100) will be explained below with reference to Figure 10. In Figure 10, thick solid lines are cutting lines, dashed lines are valley fold lines, and dotted lines are mountain fold lines. In Figure 10, cutting lines, valley fold lines, and mountain fold lines are shown only in the areas corresponding to each part of the first cylindrical cushioning section 11 and the first inner cushioning section 12 (areas enclosed by double-dotted lines).

[0039] The first cushioning member 110 is formed by folding the corrugated cardboard sheet 100 (1001) shown in Figure 10. Specifically, first, the portion of the corrugated cardboard sheet 1001 that will become the first inner cushioning portion 12 is folded. Then, the portion that will become the first cylindrical cushioning portion 11 surrounding the first inner cushioning portion 12 is folded into a hollow rectangular tube shape. In Figure 10, the transverse direction of the corrugated cardboard sheet 1001 (core 101) is the D1 direction.

[0040] In the configuration of this embodiment, a first cushioning member 110 having a first cylindrical cushioning portion 11 and a first inner cushioning portion 12 can be easily formed by folding a single corrugated cardboard sheet 1001. That is, by simply folding the corrugated cardboard sheet 1001 along the crease, the transverse direction of the core 101 forming the first inner cushioning portion 12 can be made to be the front-to-back direction.

[0041] Next, the second cylindrical buffer section 21 and the second internal buffer section 22 will be described with reference to Figures 11 to 14.

[0042] The second cylindrical cushioning portion 21 is cylindrical, having a cylindrical axis extending in the left-right direction. The second cylindrical cushioning portion 21 can be bent into a hollow rectangular tube shape. When the second cushioning member 210 is housed in the packaging case 2000 together with the packaged item 1000, one of the four outer walls of the second cylindrical cushioning portion 21 faces the packaged item 1000 and contacts the front lower side of the packaged item 1000.

[0043] Specifically, the second cylindrical buffer portion 21 has a first wall portion 211 and a second wall portion 212 that are arranged opposite to each other in the front-rear direction. The second cylindrical buffer portion 21 also has a third wall portion 213 and a fourth wall portion 214 that are arranged opposite to each other in the vertical direction.

[0044] The first wall portion 211 is positioned on the front side. The second wall portion 212 is positioned on the rear side. The second wall portion 212 faces the packaged item 1000 in the front-to-back direction and contacts the packaged item 1000 from the front side. The third wall portion 213 is positioned on the upper side, and the fourth wall portion 214 is positioned on the lower side.

[0045] The second internal buffer portion 22 is located within the internal space of the second cylindrical buffer portion 21. Specifically, the second internal buffer portion 22 is located within the space enclosed by the first wall portion 211, the second wall portion 212, the third wall portion 213, and the fourth wall portion 214. In other words, the second cylindrical buffer portion 21 has the second internal buffer portion 22 within its internal space. To put it another way, the second cylindrical buffer portion 21 has the core 101 within its internal space.

[0046] The second inner cushioning section 22 is positioned such that the transverse grain direction of the core 101 of the second inner cushioning section 22 is in the front-to-back direction. In other words, the second inner cushioning section 22 has a core 101 whose transverse grain direction is in the front-to-back direction. To put it another way, a portion of the corrugated cardboard sheet 100 that is positioned as the second inner cushioning section 22 in the internal space of the second cylindrical cushioning section 21 has its transverse grain direction in the front-to-back direction.

[0047] Furthermore, the second internal buffer portion 22 is positioned at a distance in the front-rear direction from the inner surface of the second wall portion 212. In other words, a gap G is provided between the rear end of the second internal buffer portion 22 and the inner surface of the second wall portion 212. To put it another way, the core 101 of the second internal buffer portion 22 is positioned at a distance in the front-rear direction from the inner surface of the second wall portion 212.

[0048] Here, the second internal buffer portion 22 has a horizontal wall portion 22A with the vertical direction being the plate thickness direction. Furthermore, the second internal buffer portion 22 has a vertical wall portion 22B with the left-right direction being the plate thickness direction.

[0049] The horizontal wall portion 22A is positioned approximately parallel to the third wall portion 213. The horizontal wall portion 22A may or may not be in contact with the inner surface of the third wall portion 213 (in other words, the top surface). The vertical wall portion 22B is positioned to stand upright against the inner surface of the fourth wall portion 214 (in other words, the bottom surface).

[0050] For example, two pairs of vertical wall sections 22B are arranged in the internal space of the second cylindrical buffer section 21. The horizontal wall sections 22A extend from the upper end (upper end) of each vertical wall section 22B in the left-right direction. Each horizontal wall section 22A extending from a pair of vertical wall sections 22B is connected to one another (see Figure 12).

[0051] In this embodiment, the above configuration makes it possible to obtain a second cushioning member 210 that can continuously provide a cushioning effect against multiple impacts.

[0052] Specifically, when the first impact is applied from the front of the second cylindrical buffer portion 21, the third wall portion 213 and the fourth wall portion 214 collapse in the front-rear direction, thereby buffering the first impact from the front. In other words, the second cylindrical buffer portion 21 buffers the first impact applied from the front by deforming itself. The third wall portion 213 and the fourth wall portion 214 may buckle when subjected to the first impact.

[0053] When the first impact is applied, the second inner buffer portion 22 does not function as a buffer because it is positioned at a distance in the front-rear direction from the inner surface of the second wall portion 212. In other words, the second inner buffer portion 22 does not deform (does not collapse). For example, when the second cylindrical buffer portion 21 is subjected to an impact from the front side once or more times, the second wall portion 212 comes into contact with the second inner buffer portion 22. As a result, after the second cylindrical buffer portion 21 is collapsed in the front-rear direction, the second inner buffer portion 22 can then exert its buffering effect.

[0054] Specifically, suppose that after the second wall portion 212 comes into contact with the second inner buffer portion 22 due to one or more first impacts, that is, after the second cylindrical buffer portion 21 has deformed, a second impact is applied from the front while the second cylindrical buffer portion 21 is in a deformed state. In this case, the second inner buffer portion 22 is subjected to an impact. At this time, the second inner buffer portion 22 absorbs the second impact by deforming itself.

[0055] Here, the direction of the impact applied to the second internal cushioning section 22 is approximately the same as the transverse grain direction of the core 101 that makes up the second internal cushioning section 22. That is, the second internal cushioning section 22 is subjected to an impact such that the core 101 is crushed in the transverse grain direction. When such an impact is applied to the second internal cushioning section 22, the core 101 that makes up the second internal cushioning section 22 deforms to contract in the front-rear direction (transverse grain direction), but as long as the core 101 is not completely crushed in the front-rear direction, the second internal cushioning section 22 can continue to exert its cushioning effect. As a result, the second cushioning member 210 continuously exerts its cushioning effect against multiple impacts.

[0056] The method for forming the second cushioning member 210 (the method for folding the corrugated cardboard sheet 100) will be explained below with reference to Figure 15. In Figure 15, thick solid lines are cutting lines, and dashed lines are valley fold lines. In Figure 15, cutting lines and valley fold lines are shown only in the areas corresponding to each part of the second cylindrical cushioning section 21 and the second inner cushioning section 22 (areas enclosed by dashed lines).

[0057] The second cushioning member 210 is formed by folding the corrugated cardboard sheet 100 (1002) shown in Figure 15. Specifically, first, the portion of the corrugated cardboard sheet 1002 that will become the second inner cushioning portion 22 is folded. Then, the portion that will become the second cylindrical cushioning portion 21 is folded into a hollow rectangular tube shape so as to surround the second inner cushioning portion 22. In Figure 15, the transverse direction of the corrugated cardboard sheet 1002 (core 101) is the D2 direction.

[0058] In this embodiment, a second cushioning member 210 having a second cylindrical cushioning portion 21 and a second inner cushioning portion 22 can be easily formed by folding a single corrugated cardboard sheet 1002. That is, by simply folding the corrugated cardboard sheet 1002 along the crease, the transverse direction of the core 101 forming the second inner cushioning portion 22 can be made to be the front-to-back direction.

[0059] The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of the present invention is indicated by the claims rather than by the description of the embodiments above, and furthermore, all modifications within the meaning and scope equivalent to the claims are included. [Explanation of Symbols]

[0060] 1. Cylindrical buffer section 2 Internal buffer 10. Cushioning material 100 cardboard sheets 101 Core 102 Liner 111, 211 1st wall 112, 212 2nd wall section 1000 Items to be packed

Claims

1. A cushioning member formed by folding a single corrugated cardboard sheet, A cylindrical cushioning portion having a cylindrical shaft extending in a first direction, which contacts the packaged object from one side in a second direction perpendicular to the first direction, and which cushions the first impact applied from the second direction by deforming itself, The device comprises an internal cushioning portion, which is disposed within the internal space of the cylindrical cushioning portion, and which, after the first impact, when the cylindrical cushioning portion is deformed, cushions the second impact by deforming itself when a second impact is applied from the second direction, The aforementioned internal cushioning portion is arranged such that the transverse grain direction of the core of the corrugated cardboard sheet is the second direction. The aforementioned internal cushioning portion is a laminated block formed by zigzag folding of a part of the corrugated cardboard sheet, and has a plurality of cores that overlap in a third direction perpendicular to the first and second directions, and is a cushioning member.

2. The cylindrical buffer portion has a first wall portion and a second wall portion that are arranged opposite to each other in the second direction, The first wall portion is positioned on one side in the second direction, The second wall portion is positioned on the other side in the second direction and is in contact with the packaged item. The cushioning member according to claim 1, wherein the internal cushioning portion is arranged at a distance in the second direction from the inner surface of at least one of the first wall portion and the second wall portion.

3. The cushioning member according to claim 1 or 2, wherein when the second impact is applied, the cylindrical cushioning portion contacts the surface of the liner bonded to the core within the inner cushioning portion in the internal space, thereby restricting the deformation of the inner cushioning portion in a direction different from the second direction.

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