JP7044930B1 - Cushioning material made of cardboard - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a corrugated cardboard cushioning material which protects a product to be packed from impact and whose cushioning power is enhanced and can be maintained, and can be manufactured with high versatility and low cost. Another object is to provide a corrugated cardboard cushioning material technology that can be stored in a small space. SOLUTION: Of a square cylinder formed by folding one cardboard plate into four mountain folds, it is composed of a pair of facing surfaces and a set of side surfaces, and two mountain folds and the one valley fold. In addition to utilizing the elastic characteristics exhibited by the shape formed by the above, a locking portion connecting both sides of the cardboard is provided on one of the side surfaces of the set, and the locking portion protrudes from the surface and the side surface. In addition to not allowing it to occur, we adopted a configuration in which the Y-shaped branching reinforcements formed by two small valley folds and one small mountain fold at both ends of the valley fold are arranged at the four corners that are the ends of each side surface. .. [Selection diagram] Fig. 1

Description

The present invention relates to a corrugated cardboard cushioning material, and more specifically, it is possible to protect a product to be packed from impact at a low cost that can be stored in a small space, to enhance the cushioning power, and to maintain the effect for a long time. It relates to the technology of cushioning materials made of corrugated cardboard.

The cushioning material prevents the products from rubbing against each other or colliding with each other in the box when the products are delivered, and is a material for protecting the products from impact. There are many types of cushioning materials and their features are also various, and it is necessary to select a material suitable for the product according to the types and features of the cushioning materials. Among them, corrugated cardboard has a high recycling rate and is used for outer boxes as a packaging material with a low environmental load, and is also widely used as a buffer fixing material.

According to the corrugated cardboard cushioning material, it is possible to propose a total cost reduction of physical distribution by combining improvement of cushioning performance, improvement of packaging workability, volume reduction and the like. Corrugated cardboard has excellent cost performance, but it is still inferior to high-performance resin foam materials in terms of cushioning performance. However, resin foam materials are generally more costly than pulp corrugated board.
In addition, one of the greatest features of corrugated cardboard cushioning material is that it can be stored as a flat material. Interior materials with complicated three-dimensional shapes are basically a single piece of cardboard when unfolded. The problems of "storage space" and "storage cost" that always accompany the surroundings of physical distribution can be improved at low cost by using corrugated cardboard cushioning materials.

In contrast to such corrugated cardboard cushioning materials, there are various other cushioning materials. For example, a bubble wrap (air cushion). This is a sheet covered with small round particles containing air, and is generally called "air cap" or "bubble wrap", and when you hear it as a cushioning material, you may think of it. It has excellent cushioning properties, is highly flexible, and can wrap products with complicated shapes, and is used for packaging various products from light to heavy, such as fragile mechanical products. It is also highly transparent and the contents are easy to see.

In addition, there is a foam sheet. Its feature is a cushioning material made by processing foamed polyethylene into a sheet, which is made by vaporizing and foaming gas by mixing gas with low-density polyethylene and applying pressure. It is very light and soft, and because it is thin and easy to bend, it is also suitable for packaging products with complicated shapes. It also has excellent cushioning properties due to air bubbles, and is also used as a protective material for the glass surface of furniture.

In addition, there is also rolled cardboard. This is a soft corrugated cardboard that is in the shape of a scroll. A normal corrugated cardboard has a three-layer structure in which the wavy part in the center is sandwiched between two sheets of paper, but a rolled corrugated cardboard omits one sheet of paper. The two-layer structure makes it possible to roll. It has higher strength than other cushioning materials, and is thinner and softer than ordinary corrugated cardboard. Therefore, it is mainly used for packing large products that cannot fit in a normal cardboard box, and is suitable for packing furniture when moving or packing paintings, etc. It is cut and used. In addition, there are air pillow type cushioning materials, loose cushioning materials, paper cushioning materials, and the like.

As you can see, there are many types of cushioning materials, each of which has its own characteristics, but corrugated cardboard cushioning materials are light and durable, inexpensive, and can be printed or processed freely. The corrugated cardboard that has finished its role can be recycled as a raw material for new corrugated cardboard. As described above, although corrugated cardboard is suitable as a cushioning material, there is a problem that the elastic property deteriorates when the cushioning material once bent and formed is repeatedly crushed. Therefore, there is a demand for a corrugated cardboard cushioning material capable of maintaining excellent elastic properties and related elastic properties.

Therefore, various technical proposals have been made conventionally. For example, a technique in which the title of the invention is "corrugated cardboard shock absorber" is disclosed (see Patent Document 1). Specifically, "the problem is to store the product inside the packaging case and protect the internal packaging product when the case is transported. As a solution, use a single corrugated cardboard material to face each other. Surface portions 2 and 4 to be formed, elastic side surface portions 14 and 14 having elasticity and restoring force provided on the opposite left and right side surfaces of the surface portions 2 and 4, and the other surface portion extending from one surface portion. Since the tip portion is fastened to the surface portion, at least the band members 9 and 11 provided so as to hang over the elastic side surface portion are provided. ”Has been published and is a known technique. The invention described in Patent Document 1 has a common structure with the present invention. However, in the technique described in Patent Document 1, the elastic force in the elastic side surface portion depends on only one valley fold, and does not have the reinforcing portion as in the present invention. In addition, it can be said that there is a protrusion called a band material that is arranged so as to be spread over, which causes an adverse effect of smooth loading and unloading.

Further, a technique in which the title of the invention is "furniture fall prevention device" is disclosed (see Patent Document 2). Specifically, "It solves the problems of conventional furniture fall prevention tools, and not only has a high furniture fall prevention effect as a spacer between furniture and the ceiling, but also the installation work is very easy. The purpose is to provide a furniture fall prevention device that can be easily adjusted in height according to the distance between the furniture and the ceiling, and has a simple structure and can be manufactured at low cost. " "It is a furniture fall prevention device installed between the furniture and the ceiling of the house to prevent the furniture from falling, and it is fitted into the square-shaped outer box and the inside of the outer box. A height adjusting body that is fixed to the inside of the ceiling surface of the inner box and the outer box and can be bent in the height direction while in contact with the ceiling surface of the inner box, and a predetermined bending of the height adjusting body. It is to be composed of a holding means for holding in a state. The rectangular body shape referred to in the present invention is not limited to a shape in which any one of width, depth and height is different, and the width and depth are not limited to different shapes. , Including cubes of equal height. ”Has been published and is a publicly known technique. However, the technique described in Patent Document 2 relies on only one valley fold for the elastic force in the height-adjustable body, as in the invention described in Patent Document 1, and has an reinforcing portion as in the present invention. Do not. In addition, since the tip of the string body for adjusting the height protrudes to the outside of the outer box, it can be said that the harmful effect of smooth loading and unloading occurs.

Further, a technique in which the title of the invention is "corner cushioning material" is disclosed (see Patent Document 3).
Specifically, with the aim of "providing a packing spacer that can replace the conventional product made of Styrofoam and that does not cause a problem of disposal," the configuration is "the support plate has a square shape." The first layer consisting of three corrugated cardboards is prepared with an L-shaped cardboard angle plate. The cross-sectional shape of the angle plate and the shape of the slit match, and the angle Support plates can be fitted to both ends of the plate. If spacers such as this packaging are placed inside the cardboard box, it is made of corrugated cardboard and cardboard, so there is no problem with disposal and it is relatively inexpensive to manufacture. "I can do it." Has become a publicly known technology. However, since the technique described in Patent Document 3 is composed of corrugated cardboard and thick paper, there is no problem of disposal, and although it has the effect of being relatively inexpensive to manufacture, it uses different materials and is discarded. It can be said that there is still a problem in that complicated handling such as sorting is required.

Japanese Patent Application Laid-Open No. 10-309392 Patent No. 3799054 Japanese Patent Application Laid-Open No. 4-279472

INDUSTRIAL APPLICABILITY The present invention is a corrugated cardboard cushioning material that protects the product to be packed from impact, and its cushioning power is enhanced and can be sustained. The object is to provide a corrugated cardboard cushioning material technology that can be stored in a space.

The present invention is a cushioning material made of corrugated material, and is composed of a pair of facing surfaces and a set of side surfaces of a square cylinder formed by folding a single corrugated plate into four mountain folds. On the side surface, one valley fold is made in the center between the two mountain folds parallel to the mountain fold, and the elastic characteristics exhibited by the shape formed by the two mountain folds and the one valley fold are utilized. A locking portion connecting both sides of the cardboard is provided on one of the side surfaces of the set, and the locking portion inserts a locking tongue piece having a part of one surface protruding and the locking tongue piece. Locked by the side surface having a locking port for, so that the locking portion does not protrude from the surface and the side surface, and by two small valley folds and one small mountain fold at both ends of the valley fold. By arranging the Y-shaped branched reinforcing portions to be formed at the four corners that are the ends of each side surface, a configuration is adopted that enables the enhancement of the elastic characteristics and the improvement of the holding force maintenance by the elasticity.

Further, in the present invention, it is also possible to adopt a configuration in which bending lines by a ruled line blade are provided in advance at the mountain-folded portion and the valley-folded portion.

Further, in the present invention, the corrugated board uses a material composed of a front liner, a core, and a back liner, and the corrugated board is bent in parallel in a direction in which the cross section of the core becomes corrugated, and the square cylinder is formed. The formed configuration can also be adopted.

According to the cushioning material made of corrugated cardboard according to the present invention, since corrugated cardboard is used as the material, it can be recycled as the main raw material of corrugated cardboard, and its recovery rate exceeds 90%. Various used papers such as newspaper and corrugated cardboard can be used, and it has an excellent effect of avoiding carbon dioxide emissions and contributing to the suppression of warming.

Further, according to the corrugated cardboard cushioning material according to the present invention, not only the packaged product is protected from impact, but also the cushioning force is enhanced because the reinforcing portion is provided, and further, this effect can be enhanced. It has the excellent effect of being able to last for a long time.

Further, according to the corrugated cardboard cushioning material according to the present invention, the cushioning material is highly versatile and can be manufactured at low cost, which is an excellent effect.

Further, according to the corrugated cardboard cushioning material according to the present invention, since there are no protrusions, the cushioning material can be smoothly taken in and out of the package, and can be stored in a small space, which is an excellent effect. It is something to do.

It is a basic structure theory perspective view explaining the basic structure of the corrugated cardboard cushioning material which concerns on this invention. It is a development view explaining the basic structure in the plate shape before folding, which explains the basic structure of the corrugated cardboard cushioning material which concerns on this invention. It is explanatory drawing of the reinforcement part which shows the relationship between the reinforcement part and the protrusion prevention part which concerns on this invention. It is a block diagram explaining the structure of the locking part which concerns on this invention.

The present invention is characterized in that, in the corrugated cardboard cushioning material, the reinforcing portions that can be bent are arranged at the four corners. Hereinafter, the description will be given based on the drawings. However, the shape and structure are not limited to those described in the drawings, and the changes can be made within the range in which the effect exerted as the creation of the technical idea of the present invention can be obtained.

FIG. 1 is a perspective view of a basic configuration theory for explaining a basic configuration of a corrugated cardboard cushioning material according to the present invention. Each configuration will be described in detail below.

The cushioning material 1 made of cardboard is a cushioning material made of cardboard, and is one with a set of surfaces 30 facing each other in a square cylinder 11 formed by folding one cardboard plate 10 into four mountain folds 20. It is composed of the side surfaces 40 of the set, and one valley fold 50 is made in the center between the two mountain folds 20 parallel to the mountain fold 20 on the side surface 40, and the two mountain folds 20 and the one valley fold 20 are made. In addition to utilizing the elastic characteristics exhibited by the shape formed by the 50, a locking portion 60 connecting both sides of the cardboard is provided on one of the side surfaces of the set, and the locking portion 60 is formed on one surface 30. It is locked by the side surface 40 having a locking tongue piece 61 partially protruding and a locking port 62 for inserting the locking tongue piece 61, and the locking portion 60 is from the surface 30 and the side surface 40. The four corners of each side surface 40 are the strengthening portions 70 formed by two small valley folds 50 and one small mountain fold 20 at both ends of the valley fold 50 so as not to project anything. By arranging it in the above, the basic configuration is to enable the enhancement of the elastic characteristics and the improvement of the holding force maintenance by the elasticity.

The corrugated board 10 has a triple structure of general corrugated cardboard, and the front liner 12 and the back liner 14 made of cardboard called a liner and the corrugated core 13 are bonded together with glue to form the corrugated board 10. .. The C liner contains a large amount of used paper, and the K liner has a large proportion of virgin pulp, and the material varies depending on the used paper and weight (g / m) per square meter. The higher the proportion of virgin pulp, the higher the strength, while the other is costly. The key to the strength of corrugated cardboard is the material, type and thickness of the flute, and the strength varies greatly between single flute and double flute. It may be selected as appropriate. The example shown in FIG. 1 is an example of a corrugated cardboard plate 10 having a surface of 250 mm × 195 mm and a side surface of 250 mm × 50 mm, and a single A flute with a thickness of 5 mm was used.

The square cylinder 11 has a three-dimensional shape of a square cylinder formed by folding a flat corrugated cardboard plate 10 in parallel at four places, and is orthogonal to a set of facing surfaces 30 and the surface 30. It is composed of a set of facing side surfaces 40 and a set of facing opening surfaces 90.

The front liner 12 is a cardboard of one of the two sheets sandwiching the core in the liner having a triple structure. Liners are divided into C5, C6, K5 to K7 types, and C5 and C6 use a lot of used paper, and K5 to K7 use a lot of virgin pulp in addition to used paper, so the price and strength increase accordingly. Have.

The core 13 is a corrugated portion sandwiched between the front liner 12 and the back liner 14 of the upper and lower flat plates when the cardboard plate 10 is viewed from the side, and is important for giving the cardboard-specific characteristics. It is a part. In the case of a box with a strong core 13, it is strong when stacked and firm when held by hand, and the entire box is stronger than a box with a strengthened liner alone. Corrugated cardboard plates are first classified into types according to the height of the core 13 and the number of stages per unit length (stage length), but the type of flute is particularly limited in the corrugated cardboard cushioning material 1 according to the present invention. Instead, it may be appropriately selected from the size and weight of the cushioning object. If no core 13 is specified, a core 13 called a normal core is selected, and the weight per unit square meter when the core 13 is straightened is 120 g. If there is no description of the type of the core 13 in the material notation of the corrugated cardboard, it can be determined that the standard 120 g is used. Further, while the standard core 13 is 120 g, the following four types (160 g, 180 g, 180 g reinforced core, and 200 g reinforced core) having different strengths can be selected. Even if the weight of the core 13 which is the "reinforced core" is the same as that of the standard one, the core 13 itself is hard and reinforced with a chemical, so even if the weight is the same, 180 g. There are reinforced cores and those that are not.

The back liner 14 is a cardboard of one of two sheets sandwiching the core in a liner having a triple structure. Similar to Table Liner 12, the types are divided into C5, C6, K5 to K7, and C5 and C6 use a lot of used paper, and K5 to K7 use a lot of virgin pulp in addition to used paper, so the price and strength increase accordingly. It has the characteristic of.

It is necessary to have a good balance between the front liner 12, the back liner 14, and the core 13. For example, if the core 13 is made of a high-strength material (for example, a 200 g reinforced core), it is judged that the strength is sufficient, and if the liner is made of the lowest material having a high waste paper content (for example, C5), it is bent. This is because sometimes the liner loses the hardness of the core 13 and is torn.

The mountain fold 20 is to fold a bending streak 81 shown by a broken line having a continuous constant length in FIG. 2 so that the bending streak 81 can be seen from the outside. If the mountain fold 20 is viewed from the front side of the object to be folded, it is a valley fold 50 when viewed from the back side, and the valley fold 50 is also a mountain fold 20 when the viewpoint is changed. Also, once folded and put back by these methods, a line will be formed along the folded part. This is called a crease or a bending line 81.

The surface 30 is a pair of opposing flat plate-shaped portions of the square cylinder 11 formed by folding one corrugated cardboard plate 10 into four mountain folds 20, and is directly received or repelled by external pressure as a face plate. It is a side to do.

The side surface 40 is a portion of the square cylinder 11 formed by folding one corrugated cardboard plate 10 into four mountain folds 20 and perpendicular to a pair of facing surfaces 30, and the side surface 40 has the two sides 40. It has one valley fold in the center parallel to the mountain fold, and is a surface that absorbs and repels external pressure. The side surface 40 is characterized in that not only absorption and repulsion are achieved by one valley fold, but also the absorption and repulsion are enhanced by providing reinforcing portions 70 at both ends of the valley fold.

The valley fold 50 is to fold a bending streak shown by a two-dot chain line having a constant length and two continuous points in FIG. 2 so that the bending streak is hidden from the outside. The valley fold 50 becomes the same as the mountain fold 20 when the viewpoint is changed, while the mountain fold portion 20 also becomes the same as the valley fold 50 when the viewpoint is changed. Actually, the bending streak 81 is a line inserted corresponding to the bending direction, but in FIG. 2, it is shown on the same surface in order to specify the bending position.

The locking portion 60 is a locking structure for fastening end edges to each other in order to form a square cylinder 11 obtained by folding one cardboard plate 10 in four places. As shown in 4, it is composed of a locking tongue piece 61 provided on one of the end sides and a locking opening 62 for inserting the locking tongue piece 61. The locking portion 60 is arranged on the side surface so as not to protrude from the square cylinder 11.

The locking tongue piece 61 is a tongue piece-shaped locking member protruding from one end of one corrugated cardboard plate 10, and is inserted into a locking opening 62 provided near the other end of the corrugated cardboard plate 10. It locks both ends of the cardboard.

The locking port 62 is an opening hole provided in the vicinity of the other end side for inserting and locking the tongue piece-shaped locking tongue piece 61 protruding from one end side of one corrugated cardboard plate 10. ..

The reinforcing portion 70 is a technically essential part of the corrugated cardboard cushioning material 1 according to the present invention, and as a cushioning material, absorbs a force against an external force and exerts a large repulsive force as compared with a conventional cushioning material. Is. Specifically, as shown in FIG. 1, the elastic characteristics exhibited by the shape formed by the two mountain folds 20 and the one valley fold 50 in the longitudinal direction of the side surface can be enhanced, and the elastic force can be maintained for a long period of time. It is something to do. More specifically, of the two mountain folds 20 and one valley fold 50 constituting the side surface, two small valley folds 50 and one small mountain fold 20 are formed at both ends of the one valley fold 50. The folded-back portions branched in a Y-shape are arranged at the four corners of the corrugated cardboard cushioning material 1 according to the present invention, and by having a plurality of such folded-back portions, the elastic characteristics thereof are enhanced.

The protrusion prevention portion 71 is a region in which a portion that protrudes in advance is scraped off so as not to protrude from the square cylinder 11 in a state where the reinforcement portion 70 is folded. The protrusion prevention portion 71 may be in a state in which the reinforcement portion 70 protrudes from the square cylinder 11 depending on the respective angles in the two small valley folds 50 and one small mountain fold 20 of the reinforcement portion 70 (FIG. 3 (b). )reference). Therefore, in order to avoid the existence of the protruding portion even in such a case, the protruding portion is scraped off in advance.

The ruled line blade 80 is generally a blade for making a crease in a bent portion with respect to a punching of an outer frame when producing a corrugated cardboard box. However, even if it is a blade, it does not actually have a blade edge, and there are various types of shapes such as rounded tips and corners, and the selection of such types is appropriately selected according to the thickness and material of the material. do it.

Since the bending bar 81 is basically bent in the flow direction, a crease before the bending process is made in advance by the ruled line blade 80. Further, processing may be performed in which the bending streaks 81 are used as perforations and can be said to be cuts of the same length.

The opening surface 90 maintains the opening surface in the square cylinder 11. When the side surface 40 is crushed by compression from external pressure, its opening area changes.

FIG. 2 is a development view of a basic configuration explanation in a plate shape before folding, which explains the basic configuration of the corrugated cardboard cushioning material 1 according to the present invention. In FIG. 2, the corrugated cardboard cushioning material 1 according to the present invention shows a plate-like state before being bent from the state of the corrugated board plate 10, the solid line in the figure shows the outer shape, and the wavy line shows the mountain fold 20 parts. The two-dot chain line indicates 50 valley folds. The shape is a substantially rectangular shape, in which the locking tongue piece 61 and the locking opening 62 of the locking portion 60 are provided, and the protrusion prevention portion 71 is removed as necessary. A left side view, a plan view, and a bottom view of the corrugated board 10 as viewed from the side are shown on the left side, the upper side, and the lower side, respectively. Here, as shown in the bottom view, the plan view, and the flute of the plan view, it is shown that the flute is bent in the direction across the wave of the core, that is, in the flow direction.

FIG. 3 is an explanatory view of the reinforcing portion showing the relationship between the reinforcing portion 70 and the protrusion prevention portion 71 according to the present invention, and in FIG. 3A, the small mountain fold 20 portion of the reinforcing portion 70 is a square cylinder 11. FIG. 3 (b) shows a state in which the small mountain fold 20 portion of the reinforcing portion 70 is parallel to the opening surface 90 and the angle A is 90 degrees with respect to the side surface 40, and the reinforcing portion 70 does not protrude. The small mountain fold 20 of the reinforcing portion 70 has an angle B exceeding 90 degrees with respect to the side surface 40, and the reinforcing portion 70 protrudes. FIG. 3 (c) shows the small mountain fold 20 of the reinforcing portion 70. The portion has an angle C of less than 90 degrees with respect to the side surface 40, indicating a state in which the reinforcing portion 70 does not protrude. Further, in the state of FIG. 3 (b), the lengths of one small mountain fold 20 and two small valley folds 50 are longer than those of FIGS. 3 (a) and 3 (c), so that the elastic force is increased. It is possible to enhance the effect such as the enhancement of. However, in FIG. 3B, a part of the reinforcing portion 70 protrudes from the side surface 40 portion, which is an obstacle when packing or the like. Therefore, it is desirable to remove the protrusion prevention portion 71, which is the portion concerned, in advance so that the protrusion does not occur.

4A and 4B are configuration explanatory views illustrating the configuration of the locking portion 60 according to the present invention, and FIG. 4A is a configuration sectional view of the AA'section illustrating the configuration of the locking portion 60. , FIG. 4B shows a bottom view showing the locking portion 60. As shown in FIG. 4A, the locking tongue piece 61 and the locking opening 62 are formed by the valley fold portion 50 folded into the side surface 40 in a state where the locking tongue piece 61 is inserted into the locking opening 62. The locking tongue piece 61 and the locking opening 62 are housed in the V-shaped recess to be formed, and a configuration is adopted in which the locking tongue piece 61 and the locking opening 62 do not protrude from the surface 30 portion and the side surface 40 portion. Therefore, in the packaging, the portion that interferes with the product or the like is only a flat contact, and the locking portion 60 that does not cause a problem while obtaining the effect of having the reinforcing portion 70 is configured.

According to the corrugated cardboard cushioning material 1 according to the present invention, it is possible to secure a stable state of the product in packaging, and since it can be recycled without taking up space, it contributes to the transportation industry and the like. It is considered to have high industrial applicability.

1 Corrugated cardboard cushioning material 10 Corrugated cardboard plate 11 Square cylinder 12 Front liner 13 Core 14 Back liner 20 Mountain fold 30 Surface 40 Side 50 Valley fold 60 Locking part 61 Locking tongue piece 62 Locking port 70 Reinforcing part 71 Protruding Prevention part 80 Ruled line blade 81 Bending streak 90 Opening surface A Angle B Angle C Angle

Claims (3)

It is a cushioning material made of corrugated cardboard.
It is composed of a set of facing surfaces (30) and a set of side surfaces (40) of a square cylinder formed by folding a single corrugated board (10) into four mountain folds (20).
On the side surface (40), one valley fold (50) is made in the center between the two mountain folds (20) parallel to the mountain fold (20), and the two mountain folds (20) and the one. While utilizing the elastic characteristics exhibited by the shape created by the valley fold (50),
A locking portion (60) connecting both sides of the corrugated cardboard (10) is provided on one of the set of the side surfaces (40).
The locking portion (60) has a locking tongue piece (61) on which a part of the surface (30) protrudes, and a locking opening (62) for inserting the locking tongue piece (61). Locked by the side surface (40)
A Y-shaped branching reinforcement portion (70) formed by two small valley folds (50) and one small mountain fold (20) at both ends of the valley fold (50) is formed at the end of each side surface (40). By arranging the parts at the four corners, it is possible to strengthen the elastic characteristics and improve the holding force by the elasticity.
By providing a protrusion prevention portion (71) at the end of the reinforcement portion (70), a part of the reinforcement portion (70) is prevented from protruding from the side surface (40), and the locking portion. The portion (60) is housed in a V-shaped recess formed in the side surface (40) by the mountain fold (20) and the valley fold (50), so that the locking portion (60) is made of the cushioning material. A corrugated cardboard cushioning material (1) characterized by not causing a step on the outside. The corrugated cardboard cushioning material according to claim 1, wherein bending lines (81) by a ruled line blade are provided in advance at the mountain-folded portion (20) and the valley-folded portion (50). (1). The corrugated cardboard plate (10) uses a material composed of a front liner (12), a core (13), and a back liner (14), and the cross section of the core (13) is parallel to the corrugated direction. The corrugated cardboard cushioning material (1) according to claim 1 or 2, wherein the square cylinder is formed by being bent.

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