WO2016178264A1

WO2016178264A1 - Partition plate and cushioning material

Info

Publication number: WO2016178264A1
Application number: PCT/JP2015/063067
Authority: WO
Inventors: 英和原田
Original assignee: 株式会社原田木型工業
Priority date: 2015-05-01
Filing date: 2015-05-01
Publication date: 2016-11-10
Also published as: JPWO2016178264A1; JP5846522B1

Abstract

Provided is a cushioning material which can be easily assembled and dissembled since there is no increase in the number of types of parts and which has a partition plate provided so as not to be detached inadvertently after the cushioning material is assembled. Grooves (20) of this partition plate (10) each satisfy "1/2 (height h of partition plate)" < "depth d1", and are each provided with protrusions (30) protruding within the groove. The protrusions (30) symmetrically protrude from both left and right groove side walls (23, 24) so as to have groove-bottom side horizontal surfaces (31) protruding at a position of the height h1 which is closer to the opening than the half of [height h of partition plate] from the groove bottom. Vertical sections (25, 26) each having a width b1 substantially equal to "plate thickness t of partition plate" are provided between the protrusions and an opening. A section between the protrusions and the groove bottom has a width b2 so as not to protrude beyond extension lines of the vertical sections, and a depth d2 large enough to house the protrusions (30). Outwardly opening tapered surfaces (27, 28) are also formed at the opening side.

Description

Partition plate and cushioning material

The present invention relates to a cushioning material obtained by assembling a partition plate and the partition plate.

When packaging an article, a cushioning material is often used in which a partition plate having a downward groove and a partition plate having an upward groove are assembled so that the grooves are engaged with each other and assembled in a cross-beam shape.

There is a proposal of a cushioning material using a low foam material or plastic corrugated cardboard as such a partition plate (Patent Document 1, Patent Document 2).

Japanese Unexamined Patent Publication No. 2004-131153 (FIGS. 1 to 3) JP 2010-132299 A (FIG. 2)

The cushioning material described in Patent Document 1 uses a first partition plate in which a U-shaped cut is formed and a second partition plate in which an end is cut from above and below, so that the type of component There is a problem that increases. In addition, when assembling, it is necessary to fold the notch at the end of the second partition plate to the side, insert it into the U-shaped notch of the first partition plate, and then extend the folded portion again. There is a problem that the material is limited to plastic cardboard.

The cushioning material described in Patent Document 2 has a structure in which the same type of partition plates having a plurality of linear grooves are combined with each other, so that the types of parts are not increased and the assembly is easy, but it is prevented from coming off. Therefore, it is necessary to heat-seal the bottom plate. After all, the number of parts and the ease of assembly work cannot be achieved. There is also a problem that once assembled, it cannot be disassembled.

Therefore, an object of the present invention is to provide a cushioning material that can be easily assembled and disassembled without increasing the types of parts, and from which a partition plate does not come off carelessly after assembly.

In order to achieve the above object, the partition plate of the present invention is characterized in that a groove portion formed so as to have an opening on one of the upper and lower sides has the following configuration.
(1A) The groove portion is formed such that a depth from the opening to the groove bottom is larger than ½ of the height of the partition plate, and the groove portion is formed between the opening and the groove bottom. Projecting from both the left and right groove sidewalls so as to project from the groove bottom to a position on the opening side of the height of half of the partition plate. Being.
(1B) The groove includes a vertical portion having substantially the same width as the partition plate between the protrusion and the opening, and the vertical portion extends from the protrusion to the groove bottom. A width that does not protrude inward from the extension line of the first and a depth that allows the protrusion to be accommodated.

A plurality of partition plates of the present invention are prepared, and when assembled in a cross-beam shape by shifting 90 degrees upside down so as to mesh each other's grooves, a partition plate meshed from above (hereinafter referred to as “upper partition plate”) And the projections of a partition plate (hereinafter referred to as “lower partition plate”) engaged from below are brought into contact with each other at the outer corners. In this way, when the partition plates that contact the outer corners of the protrusions are pushed into each other so as to engage more deeply, each protrusion enters the opposite groove bottom direction while slightly deforming the outer corners. To do. At this time, each partition plate has a configuration in which the depth of the groove and the position of the protrusion are described in (1A), and the width and depth from the protrusion to the groove bottom are described in (1B). Therefore, the protrusions are accommodated in the groove bottom portion with the other protrusions crossing each other. Moreover, since it has the linear part as described in (1B) between the protrusion part and the opening, the vertical part of each groove part serves as a guide for the outer surface of the other partition plate, and aligns the meshing direction, After engaging, the partition plate is prevented from falling. And since the protrusion position of a projection part has the structure as described in (1A), and the width and height from a protrusion part to a groove bottom have the structure as described in (1B), it is an upper partition. The projections of the plate are located below the projections of the lower partition plate, the horizontal surfaces of the projections of the lower partition plate are located above the upper partition plate, and prevent each other from coming out. Become. Thereby, the partition plate after an assembly does not remove carelessly. Although it does not come off inadvertently in this way, the partition plates are not separated from each other, and can be disassembled if the partition plate is intentionally extracted.

In order to achieve the above object, the partition plate of the present invention is characterized in that a groove portion formed so as to have an opening on one of the upper and lower sides has the following configuration.
(2A) The groove portion is formed so that a depth from the opening to the groove bottom is larger than ½ of a height of the partition plate, and the groove portion is formed in the groove between the opening and the groove bottom. Protruding part protruding toward
(2B) The protruding portion is a tapered surface having a slope whose height increases as the groove bottom side is a horizontal plane and the opening side is away from the groove center, and the horizontal plane is a height of the partition plate from the groove bottom. It protrudes from both of the left and right groove sidewalls so as to protrude to a position at a height that is closer to the opening side than 1/2.
(2C) The groove includes a vertical portion having a width substantially the same as the thickness of the partition plate between the protrusion and the opening.
(2D) The space from the protrusion to the groove bottom has a width that does not protrude inward from the extension line of the vertical portion and a depth that allows the protrusion to be accommodated.

A plurality of partition plates of the present invention are prepared, and when assembled in a cross-beam shape by shifting 90 degrees upside down so as to mesh each other's grooves, a partition plate meshed from above (hereinafter referred to as “upper partition plate”) And the inclined surface of the protruding portion of the partition plate (hereinafter referred to as “lower partition plate”) meshed from below are in contact with each other at the outer corners. If the partition plates that contact the outer corners of the projections are pushed in so as to engage more deeply, the outer corners of the projections are slightly deformed along the other inclined surface. Invade toward the other side of the groove. At this time, each partition plate has a configuration of (2A) in the groove portion and a (2D) configuration from the projection portion to the bottom of the groove, so that the projection portion crosses the other projection portion. And stored in the bottom of the groove. In addition, since the structure of (2C) is provided between the protrusion and the opening, the vertical portion of each groove serves as a guide for the outer surface of the other partition plate, aligns the meshing direction, and after meshing Prevents the divider from falling over. And since a projection part has the structure of (2B), the horizontal surface of the projection part of an upper partition plate is above the horizontal surface of the projection part of a lower partition plate, and the projection part of a lower partition plate The horizontal plane is located above the horizontal plane of the protrusion of the upper partition plate and is in a state in which the other party is prevented from coming out. Thereby, the partition plate after an assembly does not remove carelessly. Although it does not come off inadvertently in this way, the partition plates are not separated from each other, and can be disassembled if the partition plate is intentionally extracted. In particular, inadvertent disassembly is more reliably prevented by the engagement between the horizontal surfaces.

Here, the partition plate of the present invention may further include the following configuration.
(3) The groove is formed so that the groove side wall is symmetrical.

By making the groove side walls symmetrical, the deformation of the protrusions occurs almost symmetrically, and the horizontal planes in the assembled state are also symmetrical, so that assembly and disassembly work can be performed smoothly. In addition, the effect of preventing slipping out in the assembled state is also exhibited appropriately.

Moreover, these partition plates of the present invention may further include the following configuration.
(4) A tapered surface that opens outward is formed on the opening side of the vertical portion.

By making the opening side of the groove part an outwardly opening tapered surface, the partition plates can be engaged with each other from a slightly oblique direction, or the partition plates can be slightly pulled out in a slightly oblique direction. Can be easily.

The cushioning material of the present invention, which has been made to achieve the above object, is a cushioning material that is assembled in a grid pattern so that a plurality of partition plates having grooves formed on one side of the upper and lower sides are meshed with each other. There are materials, and each of the plurality of partition plates has the following configuration.
(5A) The partition plate is made of foamed plastic, and the groove has groove sidewalls that are symmetrical.
(5B) The groove portion is formed so that a depth from the opening to the groove bottom is larger than ½ of the height of the partition plate, and the groove portion is formed between the opening and the groove bottom. Protruding part protruding toward
(5C) The protrusion is a tapered surface having a slope whose height increases as the groove bottom side is a horizontal plane and the opening side is away from the groove center. The horizontal plane is a height of the partition plate from the groove bottom. It protrudes from both of the left and right groove sidewalls so as to protrude to a position at a height that is closer to the opening side than 1/2.
(5D) The groove includes a vertical portion having substantially the same width as the partition plate between the protrusion and the opening.
(5E) The space from the protrusion to the groove bottom has a width that does not protrude inward from the extension line of the vertical portion and a depth that allows the protrusion to be accommodated.
(5F) A tapered surface that opens outward is formed on the opening side of the vertical portion.

According to the cushioning material of the present invention, the partition plate formed of foamed plastic can deform the projection during assembly / disassembly, but the projection is restored to its original shape in the assembled state. To do. As a result, the partition plate can also be manufactured by a method of punching by Thomson punching using a commercially available low foaming extruded sheet material having a foaming ratio of 2 to 8 times and a plate thickness of 10 mm to 20 mm. On the other hand, when the foamed plastic sheet material is punched with a Thomson die, it is desirable to set the thickness to 3 mm or more in consideration of automatically discharging the punched portion from the die. Therefore, when the cushioning material of the present invention is used as a cradle for supporting an article from below, a low foam material (low foam polypropylene, low foam polystyrene, etc.) having a foaming ratio of 2 to 8 times and a plate thickness of 3 to 20 mm is used. And the partition plate for buffer materials which has a desired function can be manufactured using a Thomson die.

According to the present invention, it is possible to provide a cushioning material that can be easily assembled and disassembled without increasing the types of parts, and prevents the partition plate from being unintentionally detached after assembly.

1 shows a partition plate of Example 1, (A) is a six-sided view in which a rear view and a left side view are omitted, (B) is an aa sectional view, and (C) is a bb sectional view. The mode that the partition plate of Example 1 is assembled and it is set as a buffer material is shown, (A) is a perspective view of a partition plate, (B) is a perspective view of the buffer material in the middle of an assembly, (B) is the buffer material after completion of an assembly. FIG. The shock absorbing material formed by assembling the partition plate of Example 1 is shown, (A) is a plan view, (B) is a cc enlarged sectional view, (C) is a dd enlarged sectional view, and (D) is e. -E is an enlarged sectional view. The usage example of the shock absorbing material of Example 1 is shown, (A) is a perspective view of a mode that an article is stored and used between the meshes as a partition, and (B) is used by placing the article on the upper surface as a cradle. It is a perspective view which shows a mode. The partition plate of Example 2 is shown, (A) is a six-sided view in which the rear view and the left side view are omitted, (B) is an ff sectional view, and (C) is a gg sectional view. The usage example of the shock absorbing material which assembled the partition plate of Example 2 is shown, (A) is a perspective view before an assembly, (B) is a perspective view which shows a mode that it uses as a cradle for mounting a spherical article after completion of an assembly. It is. The mode that the partition plate of Example 3 is assembled and it is set as a shock absorbing material is shown, (A) is a perspective view before an assembly, (B) is a perspective view after the completion of an assembly. The usage example of the buffer material of Example 3 is shown, (A) is a perspective view of a mode that the article is stored and used between the meshes as a partition, and (B) is used by placing the article on the upper surface as a cradle. It is a perspective view which shows a mode. Another example is shown, (A) is an enlarged cross-sectional view of the main part before assembly of Example 4, (B) is an enlarged cross-sectional view of the main part after completion of assembly of Example 3, and (C) is that of Example 4. The principal part expanded sectional view before an assembly is shown, (D) is the principal part expanded sectional view after the assembly of Example 5 is completed.

Hereinafter, modes for carrying out the present invention will be described based on examples.

As for the partition plate 10 of the first embodiment, FIG. 1A is a six-sided view in which a rear view and a left side view are omitted, FIG. 1B is a cross-sectional view along aa, and FIG. b shows a cross-sectional view.

The partition plate 10 includes

groove portions

20 and 20 formed so that the upper side is the opening 21. The

groove portions

20 and 20 have the same shape, and are formed such that the depth d1 from the opening 21 to the groove bottom 22 is larger than ½ of the height h of the partition plate 10. Protrusions 30 and 30 projecting into the groove are provided at positions between the bottom 22.

The protrusion 30 is a tapered surface 32 having a slope that increases in height as the groove bottom 22 side is a horizontal plane 31 and the opening 21 side is away from the groove center. It protrudes from both the left and right

groove side walls

23 and 24 so as to protrude to the position of the height h1 that is closer to the opening 21 than 1/2 of the height h.

The

groove portions

20 and 20 are also provided with

vertical portions

25 and 26 having a width b1 substantially equal to the plate thickness t of the partition plate 10 between the

protrusion portions

30 and 30 to the opening 21. And between the

protrusions

30 and 30 to the groove bottom 22, a width b2 that does not protrude inward from the extension line of the

vertical parts

25 and 26, and a depth d2 that can store the

protrusions

30 and 30 ,have. Furthermore, tapered

surfaces

27 and 28 that are outwardly opened are formed on the opening 21 side of the

vertical portions

25 and 26. As shown in the drawing, the

groove portions

20 and 20 of the partition plate 10 are formed so that the

groove side walls

23 and 24 are of the same shape with left-right symmetry.

In this example, a low-foaming PP sheet (manufactured by Mitsui Chemicals Tosero Co., Ltd., product name: Palonia (registered trademark), polypropylene triple-extrusion foamed sheet) was used as the material of the partition plate 10. Further, as specific dimensions, t = 10 mm, b1 = b2 = 10.2 mm, h = 30 mm, d1 = 21 mm, h1 = 15.5 mm, d2 = 6.5 mm. In addition, b3 = 6 in this embodiment so that the tip of the protrusion 30 is chamfered vertically and the gap b3 between the left and right protrusions is within a range of 50% to 80% with respect to the plate thickness t. .2 mm (62% of t).

As shown in FIG. 2 (B), four partition plates 10 of this embodiment are prepared, and are assembled in a cross-beam shape by shifting them 90 degrees upside down so as to engage each other. The cushioning material 1 shown in C) is used for packaging.

In assembly, the inclined surface of the projection 30 of the partition plate (hereinafter referred to as “partition plate 11”) meshed from above and the projection 30 of the partition plate (hereinafter referred to as “partition plate 12”) meshed from below. Are in contact with each other at the outer corners 35 (see FIGS. 3D and 3E). Thus, when the partition plate 11 and the partition plate 12 with which the outer corners 35 of the projections 30 are brought into contact with each other are pushed in so as to engage further, the outer corners of the projections 30 are slightly deformed. Invade toward the other side of the groove.

At this time, each

partition plate

11, 12 is formed so that the groove portion 20 is “a depth d 1 from the opening 21 to the groove bottom 22 is greater than ½ of the height h of the partition plate 11 (12)”. "Between the protrusion 30 and the groove bottom 22, a width b2 that does not protrude inward from the extension line of the

vertical portions

25 and 26 and a depth d2 that can accommodate the protrusion 30". Therefore, as shown in FIGS. 3 (B) and 3 (C), the protrusions 30 are accommodated in the groove bottom portion on the other side with the other protrusions 30 crossing each other.

Further, since “the

vertical portions

25 and 26 having substantially the same width b1 as the plate thickness t of the partition plate 11 (12)” are provided between the protruding portion 30 and the opening 21, the vertical portions 25 of the respective groove portions 20 are provided. , 26 serve as a guide for the outer surface of the other partition plate 11 (12), aligning the meshing direction, and preventing the partition plate 11 (12) from falling after meshing.

Then, the protrusion 30 is formed as “a taper surface 32 having a slope that increases in height as the groove bottom 22 side becomes the horizontal plane 31 and the opening 21 side is away from the groove center, and the horizontal plane 31 extends from the groove bottom 22 to the partition plate. 11 (12) protrudes from both the left and right groove sidewalls 23 and 24 so as to protrude to the position of the height h1 on the opening 21 side than 1/2 of the height h of FIG. 3 (12). (E), the horizontal surface 31 of the protrusion 30 of the upper partition plate 11 is the horizontal surface 31 of the protrusion 30 of the lower partition plate 12, and the horizontal surface 31 of the lower protrusion 30 is the upper protrusion. It is located on the horizontal surface 31 of the part 30, and in this state, the outer corners 35 overlap with each other to prevent each other from coming out.

This prevents the assembled partition plate 11 and partition plate 12 from being inadvertently detached. Although it does not come off inadvertently in this way, the partition plates are not separated from each other, and can be disassembled if the partition plate 11 (12) is intentionally extracted.

Further, since the

groove side walls

23 and 24 are symmetric, the deformation of the protrusion 30 occurs almost symmetrically, and the engagement between the horizontal surfaces 31 in the assembled state is also symmetric. The work can be performed smoothly and the effect of preventing the removal in the assembled state is also exhibited appropriately.

In addition, by making the opening 21 side of the groove portion 20 have outwardly opening

tapered surfaces

27, 28, the partition plates can be slightly engaged from each other in an oblique direction, or the partition plates can be slightly pulled out in an oblique direction, Assembly work and disassembly work can be further facilitated.

Since the cushioning material 1 of the present embodiment is formed of a low foam material, it has appropriate hardness and cushioning properties. As a result, as shown in FIG. 4A, the article W2 is placed on the upper surface as shown in FIG. It can also be used as a cradle to be placed. In addition, since the cushioning material 1 of this embodiment is easy to assemble and disassemble, it is transported to the packing site in a disassembled state, and after unpacking, it is disassembled again and transported to a material warehouse or another site. can do.

As for the partition plate 40 of the second embodiment, FIG. 5 (A) is a six-side view in which the rear view and the left side view are omitted, FIG. 5 (B) is a sectional view taken along line ff, and FIG. g shows a cross-sectional view.

The partition plate 40 has the same material, t, h, h1, d1, d2, b1, and b2 dimensions as in the first embodiment, and the groove 20 has the same dimensions and shape as in the first embodiment. As a difference from the first embodiment, arc-shaped

concave portions

41 and 42 are provided at the center portions of the upper surface and the lower surface, respectively.

As shown in FIG. 6 (A), four partition plates 40 of the present embodiment are prepared and shifted 90 degrees upside down so as to mesh with each other, and assembled into a cross-beam shape as shown in FIG. It is used for packaging and packing as the cushioning material 2 shown in B). Since the shock-absorbing material 2 of Example 2 is provided with arc-shaped

concave portions

41 and 42 on the upper surface when assembled in a cross-beam shape, it can be used as a cradle for placing a spherical article W3.

7A is a perspective view before assembly of the cushioning material 3 of Example 3, and FIG. 7B is a perspective view after completion of assembly. In the cushioning material 1 of the first embodiment, the partition plate 10 including the two groove portions 20 is used. However, the buffer material 3 of the third embodiment is different in that the partition plate 50 including the three groove portions 20 at equal intervals is used. . Then, the cushioning material 3 of Example 3 is provided with four cells by assembling a total of six partition plates 50 in the same manner as in Example 1, three on the upper side and three on the lower side. It is assembled. The material and the dimensions of each groove 20 are the same as those in the first embodiment.

As shown in FIG. 8 (A), the cushioning material 3 of the present embodiment can be used as a partition for storing the articles W3a to w3d between the meshes assembled in the form of a cross girder, as shown in FIG. 8 (B). As shown, it can also be used as a cradle for placing the article W4 on the upper surface.

Example 4 is a cushioning material 4 that employs

partition plates

61 and 62 having

rectangular cross-section protrusions

71 and 72 as protrusions, as shown in FIGS. 9 (A) and 9 (B). The dimensions of the material, t, h, h1, d1, d2, b1, b2 are the same as in Example 1, but the gap b4 between the protrusions is 80% of the plate thickness t. Also in this embodiment, when assembling, the projection 71 of the upper partition plate 61 and the projection 72 of the lower partition plate 62 abut each other at the outer corners, and the other storage portion is slightly deformed. It is stored in. And in the assembled state, the protrusion part 71 and the protrusion part 72 prevent inadvertent pull-out at the outer corners. Further, at the time of disassembly, the outer corner of the projection 71 and the outer corner of the projection 72 that functioned as prevention of slipping out are slightly deformed, so that slipping out is not hindered in intentional disassembly work.

Example 5 is a cushioning material 5 that employs

partition plates

81 and 82 having semicircular

cross-sectional protrusions

91 and 92 as protrusions, as shown in FIGS. 9 (C) and (D). The dimensions of the material, t, h, h1, d1, d2, b1, b2 are the same as in Example 1, but the gap b5 between the protrusions is 50% of the plate thickness t. Also in this embodiment, when assembling, the protruding portion 91 of the upper partition plate 81 and the protruding portion 92 of the lower partition plate 82 are in contact with each other at the outer corners, and the other storage portion is slightly deformed. It is stored in. In the assembled state, the protruding portion 91 and the protruding portion 92 prevent inadvertent withdrawal at the outer corners. Further, at the time of disassembly, the outer corners of the protrusion 91 and the outer corners of the protrusion 92 that functioned as a prevention of slipping out are slightly deformed, so that the pulling out is not hindered in the intentional disassembly work.

As described above, according to each embodiment, it is possible to provide a cushioning material that can be easily assembled and disassembled without increasing the types of components and that prevents the partition plate from being inadvertently removed after assembly. .

As mentioned above, although the Example of this invention was described, it cannot be overemphasized that various deformation | transformation implementation is possible for this invention in the range which is not restricted to an Example and does not deviate from the summary.

For example, although all examples used a low foaming PP sheet, a low foaming polyester sheet may be used, and the foaming magnification and the plate thickness are not limited to those of the example, and when used as a cradle, Of the foamed plastics having an expansion ratio of 2 to 8 times and a plate thickness of 3 to 20 mm, those having hardness and cushioning properties suitable for the object to be packaged and packed may be adopted. Further, the present invention is not limited to the packaging / packaging cushioning material, and can be used for various uses other than packaging / packaging, for example, installed under a floor board as a cushioning material for a floor having cushioning properties.

Primarily, it can be used as a cushioning material as a packaging / packaging material.

1, 2, 3, 4, 5...

Buffer material

10, 11, 12, 40, 50, 61, 62, 81, 82... Partition plate, 20. Opening, 22 ... groove bottom, 23, 24 ... groove side wall, 25, 26 ... vertical portion, 27, 28 ... tapered surface, 30, 71, 72, 91, 92 ... projection Part, 31 ... horizontal plane, 32 ... taper surface, 35 ... outer corner, 41, 42 ... recess, W1, W2, W3a to W3d, W4 ... article.

Claims

A partition plate characterized in that a groove formed so as to have an opening on one of the upper and lower sides has the following configuration.
(1A) The groove portion is formed such that a depth from the opening to the groove bottom is larger than ½ of the height of the partition plate, and the groove portion is formed between the opening and the groove bottom. Projecting from both the left and right groove sidewalls so as to project from the groove bottom to a position on the opening side of the height of half of the partition plate. Being.
(1B) The groove includes a vertical portion having substantially the same width as the partition plate between the protrusion and the opening, and the vertical portion extends from the protrusion to the groove bottom. A width that does not protrude inward from the extension line of the first and a depth that allows the protrusion to be accommodated.
A partition plate characterized in that a groove formed so as to have an opening on one of the upper and lower sides has the following configuration.
(2A) The groove portion is formed so that a depth from the opening to the groove bottom is larger than ½ of a height of the partition plate, and the groove portion is formed in the groove between the opening and the groove bottom. Protruding part protruding toward
(2B) The protruding portion is a tapered surface having a slope whose height increases as the groove bottom side is a horizontal plane and the opening side is away from the groove center, and the horizontal plane is a height of the partition plate from the groove bottom. It protrudes from both of the left and right groove sidewalls so as to protrude to a position at a height that is closer to the opening side than 1/2.
(2C) The groove includes a vertical portion having a width substantially the same as the thickness of the partition plate between the protrusion and the opening.
(2D) The space from the protrusion to the groove bottom has a width that does not protrude inward from the extension line of the vertical portion and a depth that allows the protrusion to be accommodated.
The partition plate according to claim 1, further comprising the following configuration.
(3) The groove is formed so that the groove side wall is symmetrical.
The partition plate according to any one of claims 1 to 3, further comprising the following configuration.
(4) A tapered surface that opens outward is formed on the opening side of the vertical portion.
A plurality of partition plates formed with grooves on one side of the upper and lower sides are buffer materials assembled in a cross-beam shape so as to mesh the groove portions with each other, each of the plurality of partition plates, A cushioning material comprising the following configuration.
(5A) The partition plate is made of foamed plastic, and the groove has groove sidewalls that are symmetrical.
(5B) The groove portion is formed so that a depth from the opening to the groove bottom is larger than ½ of the height of the partition plate, and the groove portion is formed between the opening and the groove bottom. Protruding part protruding toward
(5C) The protrusion is a tapered surface having a slope whose height increases as the groove bottom side is a horizontal plane and the opening side is away from the groove center, and the horizontal plane is a height of the partition plate from the groove bottom. It protrudes from both of the left and right groove sidewalls so as to protrude to a position at a height that is closer to the opening side than 1/2.
(5D) The groove includes a vertical portion having a width substantially the same as the thickness of the partition plate between the protrusion and the opening.
(5E) The space from the protrusion to the groove bottom has a width that does not protrude inward from the extension line of the vertical portion and a depth that allows the protrusion to be accommodated.
(5F) A tapered surface that opens outward is formed on the opening side of the vertical portion.