JP2007022591A - Shock-absorbing medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve absorbability of shock compared with conventional ones to improve product protection. <P>SOLUTION: A shock-absorbing medium 10 is such structured that a bottom of a space surrounded by peripheral walls 11 and 12 is closed by a closure 13. The peripheral wall 12 extending in the X-direction has a step 12c, and the closure 13 has a protrusion 15 protruding from an internal surface 13a higher than the step 12. The protrusion 15 is of a hollow structure with a recess 16 formed by denting an external surface 13b of the closure 13. When a shock is applied, the protrusion 15 deforms to absorb the shock. When the shock is strong, the protrusion 15 sinks, the closure 13 is moved to have the recess 16 expanded, and a product is received by a protruding end 15a of the protrusion 15 and the step 12c of the peripheral wall 12 to absorb the shock. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cushioning material that intervenes between a product and a cardboard box to buffer an impact received by the cardboard box when various products are stored in the cardboard box, and particularly improves shock absorption.

  Conventionally, when various products such as electrical products and electronic products produced in factories are shipped, the products are packed in a cardboard box, for the purpose of cushioning the impact received from the outside during positioning and transportation of the product in the cardboard box A cushioning material is used. There are various materials for the buffer material, such as synthetic resin, foamed resin, and paper. Recently, for the purpose of promoting recycling, a buffer material formed by pulp molding from recycled paper is sometimes used. Such a cushioning material absorbs impacts by utilizing the properties (elasticity, flexibility, etc.) of the used waste paper.

  FIG. 9 shows an example of a conventional packing form, in which a cushioning material 1 formed by a pulp mold is stored in a cardboard box B, and then a product P covered with a sheet material S is packed. When packing, the product P covered with the sheet material S is placed inside the cardboard box B so that the front panel portion Pa of the product P is surrounded by the cushioning material 1. In addition, after storing the product P, the back part Pb side of the product P is also surrounded by a similar cushioning material (not shown).

  FIG. 10 shows a state where the front panel portion Pa of the product P packed in the cardboard box B is surrounded and protected by the cushioning material 1. The cushioning material 1 includes a bottom portion 3 and a peripheral wall portion 2 having a flange portion 4 on the opening side. The peripheral wall portion 2 is provided with a step 2c in the height direction, and an upper wall portion 2a above the step 2c. A lower wall portion 2b is provided below the step 2c. When the cushioning material 1 is housed inside the cardboard box B, the outer surface of the bottom 3 is in contact with the inner surface Bc of the side plate portion Ba of the cardboard box B, and the peripheral flange portion 4 is in contact with the peripheral inner surface of the cardboard box B. In this state, when the product P is housed in the interior 1 from the opening 1 a of the cushioning material 1, the cushioning material 1 supports the front panel portion Pa of the product P at the step 2 c of the peripheral wall portion 2. In addition, in FIG. 10, in order to express clearly the support form of the product P by the buffer material 1, illustration of the sheet material S which covers the product P is abbreviate | omitted.

In addition, the other form which concerns on the cushioning material of pulp mold shaping | molding is disclosed by the following patent documents 1, 2, and the packaging material which comprises the cushioning function which bent the corrugated cardboard as a cushioning material other than pulp molding molding is the following patent. It is disclosed in Document 3.
JP 2005-47566 A JP 2003-54640 A Japanese Patent Laid-Open No. 2004-196407

  Since many conventional shock absorbing materials absorb shocks due to the characteristics of the material of the shock absorbing material itself, there is a problem that the range of impact sizes that can be handled is small. For example, since the cushioning material 1 shown in FIG. 10 supports the product P by the step 2c provided on the peripheral wall portion 2, when an impact is applied in the direction of the arrow in the figure, the lower wall portion 2b of the peripheral wall portion 2 is bent. Although the impact is absorbed, there is a problem that if the magnitude of the impact exceeds the level that can be absorbed by the lower wall portion 2b, the impact is directly applied to the product P in contact with the step 2c. Further, the cushioning material according to Patent Literature 2 and the packaging material according to Patent Literature 3 also have a problem that they cannot cope with an impact of a certain level or more because they absorb the impact due to the bending of the material.

  Furthermore, although the cushioning material according to Patent Document 1 allows the rigidity to be adjusted by the shape, size, and number of the V-grooves, it is difficult to make it possible to handle a wide range of large and small impacts. For example, when the shape, size, and number of V-grooves are adjusted so as to cope with a small impact, the product cannot be reliably protected if an impact greater than an assumed level is applied. Further, when the shape, size, and number of the V-grooves are adjusted so as to be able to deal with a large impact, the cushioning material becomes so rigid that a small impact cannot be absorbed efficiently.

  This invention is made | formed in view of such a problem, and it aims at providing the shock absorbing material which made it possible to absorb the impact of a wide range flexibly compared with the conventional shock absorbing material.

  In order to solve the above-described problem, the cushioning material according to the present invention is a cushioning material including a peripheral wall portion having a step and a closing portion that closes a space surrounded by the peripheral wall portion from the bottom side. And a recess having an outer surface recessed according to the shape of the protrusion, and the protrusion protrudes beyond the height from the inner surface of the closing portion to the step of the peripheral wall portion. It is characterized by.

  In the present invention, since the projecting portion is provided in the closed portion and the concave portion is formed by recessing the outer surface according to the shape of the projecting portion, the projecting portion has a hollow configuration and is moderate to the projecting portion. The projecting part comes into contact with the article (product) to be protected by the cushioning material by making the projecting part higher than the step of the peripheral wall part. As a result, when the article is stored in the cushioning material, the protruding portion supports the article, and when a small impact is applied, the protruding portion is deformed to absorb the impact. In addition, when a large impact is applied, the projecting portion is greatly deformed and the article comes into contact with the step of the peripheral wall portion, and the impact is absorbed while the article is supported by both the projecting portion and the peripheral wall portion. In this way, it is possible to absorb shocks of various degrees in stages, thereby improving the shock absorption compared to the conventional case.

  In the cushioning material according to the present invention, the protruding portion includes a side wall portion that is inclined so that the protruding end side is thinner than the protruding base portion side, and the inclination angle of the side wall portion is 45 degrees or more with respect to the closing portion. It is characterized by becoming.

  In the present invention, the protruding portion is formed so that the protruding end side is thinner than the protruding base side, and the side wall portion of the protruding portion is inclined at an angle of 45 degrees or more with respect to the closing portion. The overall cross-sectional shape is substantially inverted V-shaped, and after securing a predetermined rigidity (impact absorbability), when subjected to a large impact, the side wall portion is easily deformed so as to spread outward. When the side wall part is deformed so as to spread outward, the closing part located on both sides of the recess also moves following the outer part, so the peripheral wall part crossing the closing part has both ends of the closing part. Deforms to fall inward with the side as a fulcrum. As a result, the article is wrapped by the peripheral wall portion, and the protection of the article against a large impact can be improved.

The cushioning material according to the present invention is characterized in that a portion connected from the outer surface of the closing portion to the recess is curved.
In the present invention, the curved portion is formed from the outer surface of the closing portion to the recess, so that when the cushioning material is placed in a packing box such as a cardboard box, the area of the outer surface of the closing portion that contacts the inner surface of the packing box Decrease. Along with this, the frictional resistance between the outer surface of the closing part and the inner surface of the packaging box is also reduced, and the closing parts located on both sides of the recess can be smoothly moved following the deformation of the protruding part, and the impact of various ranges is efficient Can absorb well.

The cushioning material according to the present invention is characterized in that the outer surface of the closing portion is smoother than the outer surface of the peripheral wall portion.
In the present invention, since the outer surface of the closing portion is made smoother than the outer surface of the peripheral wall portion, the outer surface of the closing portion becomes the smoothest among the outer surfaces of the cushioning material. Therefore, when the cushioning material is put in a packing box such as a cardboard box, the closing part can smoothly move along the inner surface of the packing box following the deformation of the protruding part upon receiving an impact. Therefore, various levels of impact absorbability can be further enhanced. In addition, as a processing method for smoothing the surface, for example, in the case of a buffer material for pulp molding, it is conceivable to perform pressing only on the outer surface of the peripheral wall portion.

The shock-absorbing material according to the present invention is characterized in that the protruding portion is formed so that the concave portion has a groove shape.
In the present invention, since the protruding portion is formed so that the concave portion has a groove shape, the protruding portion is linearly connected in one direction. Therefore, when the shape of the article to be protected has one direction as the longitudinal direction, the part corresponding to the longitudinal direction of the article can be reliably supported by the protruding portion, and even when the article is large in one direction, the optimum shock absorption It is possible to form a cushioning material that ensures the property.

The shock-absorbing material according to the present invention includes a plurality of the protruding portions and a plurality of the concave portions.
In the present invention, since a plurality of protrusions and recesses are provided, the tolerance for absorbing the impact can be adjusted as appropriate, and a large article can be reliably supported to absorb the impact. In the case where a plurality of pairs of protrusions and recesses are provided, various arrangement forms such as a form in which the pair of protrusions and recesses are arranged in parallel, a form in which they are arranged orthogonally, and a form in which they are arranged in a lattice shape can be applied. It is preferable to appropriately determine the arrangement form in consideration of the upper limit of the degree of impact that can be handled, the shape of the target article, the size of the article, and the like.

  In the present invention, since the article is normally supported by a hollow protrusion provided in the closed portion, the impact can be absorbed by the deformation of the protrusion for a small impact, and the protrusion for a large impact. The part is greatly deformed and the article can be supported even at the step of the peripheral wall part, and the impact can be absorbed by both the projecting part and the peripheral wall part.

  In the present invention, the side wall portion of the inverted V-shaped projecting portion is inclined at an angle of 45 degrees or more with respect to the closing portion, so that the received impact can be absorbed by the movement of the closing portion and the movement of the closing portion. Since the peripheral wall part falls inward in conjunction with the wrapping and wraps the article, the protection against the article can be further improved.

  In the present invention, since the portion that continues from the outer surface of the closing portion to the recess is curved, the area where the outer surface of the closing portion is in contact with the inner surface of the packaging box can be reduced, and the protrusion can be deformed when subjected to an impact. Accordingly, the closing portion can be moved smoothly, and the shock absorption can be improved.

  In the present invention, the outer surface of the closing portion is made smoother than the outer surface of the peripheral wall portion, so that when receiving an impact, the closing portion smoothly moves following the deformation of the protruding portion, and the impact is applied. Can be absorbed efficiently.

  In the present invention, since the protruding portion is formed so that the concave portion has a groove shape, even for an article having a large size, a protruding portion matched to the groove-shaped concave portion is formed according to the size of the article. The article can be reliably supported and the shock can be absorbed appropriately.

  In the present invention, since there are a plurality of protrusions and recesses, it is possible to support articles of various shapes, and to adjust the allowable range capable of absorbing impacts appropriately, and to provide a cushioning material according to the impact resistance of the articles it can.

  1 and 2 show a cushioning material 10 according to an embodiment of the present invention. In FIG. 1, a part of the cushioning material 1 is broken so that the shape becomes clear. FIG. It is sectional drawing of the packing form containing the buffer material 10 in -A line | wire. The cushioning material 10 of the present embodiment is integrally formed with a pulp mold using melted waste paper, and the inner peripheral surface of the interior 10b of the cushioning material 10 is on the side in contact with a molding die for pulp molding. The outer peripheral surface that is not in contact with the paper has a large unevenness compared to the inner peripheral surface because the used paper in which the material is dissolved is stuck.

  The buffer material 10 has a required flexibility in terms of material by being pulp-molded with melted waste paper. Further, the cushioning material 10 of the present embodiment is molded for use in the packing form shown in FIG. 9, and is sized to fit into a packing box (for example, a cardboard box B) and into the shape of the product P to be protected. In addition, one shape (the X direction in FIG. 1) is the longitudinal direction.

  The cushioning material 10 forms a peripheral portion with a pair of opposed peripheral wall portions 12 extending along the longitudinal direction (X direction) and a set of opposed peripheral wall portions 11 along the Y direction, and the peripheral wall portion 11 and 12, one side (bottom side) of the space in the interior 11 b surrounded by the closed portion 13 is closed, and the other side of the space in the interior 11 b is an opening 10 a. Further, the peripheral wall portion 12 in the longitudinal direction has a step 12c, the opening 10a side from the step 12c is the upper wall portion 12a, and the closing portion 13 side from the step 12c is the lower wall portion 12b.

  Note that the peripheral wall portions 11 and 12 are provided with a draft gradient so as to be easily detached from the pulp mold, and are inclined so as to spread toward the opening 10a (angle θ2 in FIG. 2). . Further, the peripheral wall portions 11 and 12 have a flange portion 14 protruding from the outer edge of the opening 10a. When the cushioning material 10 is put in the cardboard box B, the flange portion 14 is brought into contact with the inner peripheral surface of the cardboard box B. The buffer material 10 is prevented from moving carelessly.

  The closing portion 13 is provided with a protruding portion 15 that protrudes from the inner surface 13a to the space of the inner portion 10b at a central portion in the width direction (Y direction). As shown also in FIG. 2, when the closing portion 13 is at the bottom, the protruding portion 15 has an inverted V-shaped cross section so that the protruding end 15 a side is thinner than the protruding base portion 15 c side of the closing portion 13. The height H1 of the protruding end 15a from the inner surface 13a is larger than the height H2 of the step 12c of the peripheral wall portion 12 from the inner surface 13a.

  Further, the projecting portion 15 having an inverted V-shaped cross section inclines the side wall portion 15b with respect to the closing portion 13 so as to have an inclination angle θ1, and in this embodiment, the inclination angle θ1 is set to 60 degrees. In this way, by setting the inclination angle θ1 to 60 degrees, when the protruding portion 15 receives a load due to an impact in the direction of the white arrow in FIG. 2, the side wall portion 15b receives a certain amount of load and the side wall portion 15b itself. Bends and absorbs the load (impact). Furthermore, when the received load is large, it moves outward (arrow Y1, Y2 direction in FIG. 2) so that the protruding base portion 15c side of the side wall portions 15b on both sides spreads to release the load.

  On the other hand, the closing part 13 of the projecting part 15 forms a recess 16 at a position corresponding to the projecting part 15b on the outer surface 13b, and this recess 16 has an outer surface 13b according to the shape of the projecting part 15b (inverted V shape). The shape is recessed. By providing the concave portion 16 in this manner, the protruding portion 15 on the inner surface 13a side is structurally hollow, and when the protruding portion 15 receives a load, the side wall portion 15b is kept flexible to absorb the load. In addition, the side wall 15 can be easily deformed so that the side wall 15 spreads outward, and the received load can be smoothly released.

  In addition, as shown in FIG. 1, the protrusion part 15 by the side of the inner surface 13a of the closing part 13 is formed so that it may extend along a X direction, and the recessed part 16 by the side of the outer surface 13b is also along a X direction in connection with it. It is formed in a groove shape. Further, both end portions 15d and 15e in the X direction of the protruding portion 15 are closed.

  Next, in the case where the cushioning material 10 having the above-described configuration is used in a packing form as shown in FIG. 9, a mechanism for absorbing the impact when the impact is given to the cardboard box B is shown in FIGS. This will be explained based on.

  First, when the product P is put into the cardboard box B while the cushioning material 10 is put in the cardboard box B, the cushioning material 10 surrounds the front panel portion Pa of the product P to protect the product P. Further, when the cardboard box B is oriented so that the closing portion 13 of the cushioning material 10 is on the bottom side, the protruding portion 15 of the cushioning material 10 is higher than the step 12c of the peripheral wall portion 12, and therefore the front of the product P The panel portion Pa is supported by a projecting end 15a that is the tip of the projecting portion 15, and both end portions Pc and Pd of the front panel portion Pa are not in contact with the upper surface of the step 12c of the circumferential wall portion 12, and the upper wall portion of the circumferential wall portion 12 It will contact | abut to the inner surface 12g of 12a, and will be in the state clamped by the upper wall part 12a which opposes (refer FIG. 2).

  Next, when the cardboard box B receives an impact in the direction of the white arrow in FIG. 2 in the state described above, when the impact is small, the impact is absorbed by the side wall 15b of the protrusion 15 being bent, and the impact Is prevented from being transmitted directly to the product P. Further, when the impact received by the cardboard box B is slightly large, the side wall 15b is bent and the side wall 15b moves outward so that the impact is transmitted to the side wall 15 so that the concave portion 16 is widened. Thus, the closing portions 13 on both sides of the concave portion 16 also move in the directions of arrows Y1 and Y2 in FIG. By such a chain movement of the side wall portion 15b and the closing portion 13, it is possible to reliably prevent the impact from being transmitted to the product P by releasing the load related to the impact.

  When the impact received by the cardboard box B is greater, the projecting portion 15 is deformed, and the side wall portion 15b and the closing portion 13 are greatly moved in the directions of arrows Y1 and Y2 in FIG. At this time, if the deformation dimension in the height direction of the projecting portion 15 becomes larger than H3 (H3 = H1-H2), the front panel portion Pa of the product P is added to the projecting end 15a of the projecting portion 15 and the peripheral wall portions 12 on both sides. The product P is also supported by the protrusion 15 and the step 12c on both sides and reliably received.

  Furthermore, in the above-described case, following the movement of the closing portion 13 in the directions of the arrows Y1 and Y2, the lower ends 12e of the peripheral wall portions 12 on both sides also move in the same manner as the closing portion 13, and the peripheral wall portions on both sides are moved by the reaction. 12 moves so that the upper end 12f of 12 falls in the directions of arrows Y3 and Y4 in FIG. As a result, the peripheral wall portions 12 on both sides are tilted inward in conjunction with the movement of the closing portion 13, and are sandwiched between the upper wall portions 12a on both sides so as to wrap the product P as shown in FIG. Protect from. In the state shown in FIG. 3, the side wall 15b of the projecting portion 15 widens to an inclination angle θ1 ′ (θ1 ′ <θ1), and the inclination angle of the peripheral wall portion 12 also decreases (θ2 is approximately 0). Every time).

  Furthermore, when the impact is even greater, the side wall 15b itself of the protrusion 15 and the lower wall 12b of the peripheral wall 12 are in a state where the product P is received by the protrusion 15 and the step 12c on both sides shown in FIG. The portion is bent and deformed to absorb the impact so that the impact is not transmitted to the product P to the maximum extent. As described above, when the cushioning material 10 according to the present invention is used, it is possible to efficiently absorb a wide range of impacts as compared with the conventional cushioning material and prevent the product P from being affected by the impacts.

  In addition, after receiving an impact, if the degree of deformation due to the impact is within a range that can be accommodated by the flexibility of the cushioning material 10 (within elastic deformation), the original state (shape) is restored, and the degree of deformation is large. When the range that can return to the original state is exceeded, the deformed shape is maintained.

  Further, the cushioning material 10 according to the present invention is not limited to the above-described embodiment, and various modifications can be applied. For example, the shape of the cushioning material 10 can be changed to various shapes depending on the article to be protected, other than the longitudinal direction of the X direction shown in FIG. Further, the material for forming the cushioning material 10 is not limited to melted waste paper, but is molded into the shape shown in FIGS. 1 and 2 using a synthetic resin, a foamed resin or the like having predetermined flexibility and deformability. May be.

  Furthermore, the inclination angle θ1 of the side wall 15b of the protrusion 15 shown in FIG. 2 is not limited to 60 degrees, and both the side wall 15b absorbs an impact and smoothly spreads outward. In order to achieve a good balance, it is preferable to set the inclination angle θ1 to 45 degrees or more, and it is preferable to set the inclination angle θ1 to a range of 45 degrees or more and less than 90 degrees according to the size and shape of the product to be protected. It is. Furthermore, although the both ends 15d and 15e (refer FIG. 1) in the X direction of the protrusion part 15 are spaced apart from the surrounding wall part 11 along a Y direction, you may make it the structure connected with the inner surface of the surrounding wall part 11. FIG. By connecting in this way, the rigidity of the protrusion 15 can be increased, and the degree to which the product can be supported and the degree to absorb the impact can be adjusted.

  Moreover, when the buffer material 10 is shape | molded with a pulp mold with the melted waste paper, it is preferable to make the outer surface 13b (refer FIG. 2) of the closing part 13 smoother than the outer surface of the surrounding wall part 12 using a press etc. By doing so, the friction with the inner surface Bc of the side plate portion Ba of the cardboard box B is reduced, and the closing portion 13 can be smoothly moved to the arrows Y1 and Y2 along the side plate portion Ba, thereby improving the shock absorption. .

  Furthermore, as another example of a cushioning material 20 provided with the protruding portion 25 shown in FIG. 4, a portion 26a where the closing portion 23 and the recessed portion 26 are continuous may be curved with a predetermined curvature (R1). . By doing in this way, the area of the outer surface 23b of the side wall part 23 is reduced, the friction with the cardboard box B is reduced, and the closing part 23 can be moved smoothly. Moreover, in order to reduce the area of the outer surface 23b of the side wall part 23, it is preferable to also curve the part 23g where the surrounding wall part 22 and the closing part 23 continue with a predetermined curvature (R2).

  FIG. 5 shows another modified example, and shows the cushioning material 30 in which the two protrusions 35 and 37 and the recesses 36 and 38 are formed corresponding to the protrusions 35 and 37, respectively. The cushioning material 30 of this modification is intended to protect a product having a large dimension in the Y direction in FIG. 5, and aims to support the product reliably and absorb the shock efficiently. The protrusions 35 and 37 (recesses 36 and 38) are arranged side by side. The number of protrusions 35 and 37 (recesses 36 and 38) is not limited to two, and may be three or more depending on the size of the product in the Y direction.

  FIG. 6 is another modification in the case of providing a plurality of protrusions (recesses). In the cushioning material 40 shown in FIG. 6, the two protrusions 45 and the protrusions 47 and the protrusions 45 and 47 are provided. The concave portions 46 and 48 corresponding to the above are linearly provided on the inner surface 43a of the closing portion 43 along the X direction. These protrusions 45 and 47 (recesses 46 and 48) are formed by dividing the protrusion 15 (recess 16) shown in FIG. 1 at one place in the X direction. In the cushioning material 40 having the projecting portions 45 and 47 (recessed portions 46 and 48) in such a divided form, it becomes possible to appropriately adjust the degree of support of the product by the degree of division, the degree of shock absorption, and the like. Can be protected according to the product specifications. As specific adjustment, the length of the part to be divided, the number of parts to be divided, and the like are changed as appropriate, and in some cases, the protruding part may be formed in an island shape by finely dividing.

  Furthermore, the cushioning material 50 of the modified example shown in FIG. 7 is provided with bellows-like protrusions 59a to 59c between the protrusions 55 and 57 (recesses 56 and 58) provided linearly at intervals. It is a feature. By providing these protrusions 59a to 59c, it is possible to increase the flexibility (particularly, the force in the returning direction) when the closing portion 53 moves in the Y direction when receiving an impact, and the shock absorption is further improved. Can be increased.

  Furthermore, the cushioning material 60 of another modified example shown in FIG. 8 includes a third protrusion between the protrusions 65 and 67 (recesses 66 and 68) provided on the closing part 63 with a linear spacing. The feature is that the portion 71 (concave portion 72) is provided along the Y direction. By providing the third projecting portion 71 in the Y direction as described above, the product can be supported and the impact can be absorbed in the form shown in FIGS. 2 and 3 even in the X direction. Both can absorb the shock and protect the product reliably.

  In addition, the form of the modification shown in FIG. 8 can support a product suitably and can absorb an impact, even when the product to be protected has a large dimension in the Y direction. Further, the arrangement form of the protrusions 65, 67, 71 (recesses 66, 68, 72) shown in FIG. 8 can be applied to four or more arrangements, and an arrangement form like a lattice as a whole is also applicable. Furthermore, both end portions 72a and 72b of the protruding portion 71 in the Y direction may be connected to the peripheral wall portion 62 to increase the rigidity. Furthermore, the various modifications shown in FIGS. 4 to 8 can be appropriately combined.

It is a perspective view of the shock absorbing material which fractured | ruptured a part based on embodiment of this invention. It is sectional drawing of the packing form containing the shock absorbing material in the AA line of FIG. It is sectional drawing which shows the state of the shock absorbing material at the time of receiving an impact. It is sectional drawing of the shock absorbing material of a modification. It is sectional drawing of the shock absorbing material of another modification. It is a principal part perspective view which shows the shock absorbing material of another modification. It is a principal part perspective view which shows the shock absorbing material of another modification. It is a principal part perspective view which shows the shock absorbing material of another modification. It is a perspective view which shows an example of the packing form using a buffer material. It is sectional drawing of the packing form containing the shock absorbing material in the BB line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Buffer material 12 Peripheral wall part 12c Step 13 Closure part 13a Inner surface 13b Outer surface 15 Projection part 15a Projection end 15b Side wall part 15c Projection base 16 Concave part B Cardboard box P Product

Claims (6)

In a cushioning material comprising a peripheral wall portion having a step and a closing portion that closes a space surrounded by the peripheral wall portion from the bottom side,
The closure is
A protrusion protruding from the inner surface;
A recess having a recessed outer surface according to the shape of the protrusion,
The cushioning material, wherein the projecting portion projects beyond a height from an inner surface of the closing portion to a step of the peripheral wall portion. The protruding portion includes a side wall portion that is inclined so that the protruding end side is thinner than the protruding base side,
The cushioning material according to claim 1, wherein an inclination angle of the side wall portion is 45 degrees or more with respect to the closing portion.   The cushioning material according to claim 1 or 2, wherein a portion that continues from the outer surface of the closing portion to the recess is curved.   The cushioning material according to any one of claims 1 to 3, wherein an outer surface of the closing portion is smoother than an outer surface of the peripheral wall portion.   The cushioning material according to any one of claims 1 to 4, wherein the protruding portion is formed so that the concave portion has a groove shape. A plurality of the protrusions;
The cushioning material according to any one of claims 1 to 5, comprising a plurality of the recesses.

Images