JP5150395B2 - Cushioning material and packing box - Google Patents

Description

  The present invention relates to a cushioning material used for a packaging box that accommodates a product, and a packaging box.

  In packaging boxes for electronic devices, shock absorbers are used inside the packaging box to prevent damage to the packed items such as built-in equipment due to static external load and impact force such as drop impact. . As the material of the cushioning material, cardboard that is inexpensive, easy to procure and recyclable is often used. On the other hand, downsizing of the packaging box is required from the viewpoint of transportation cost and environmental load. The size of the packaging box is determined by the dimensions of the built-in equipment and the cushioning material, and downsizing of the cushioning material is an effective means for downsizing the packaging box.

  However, when the cushioning material is reduced in size, the gap between the built-in item and the packaging box is narrowed, resulting in a trade-off problem that the cushioning stroke for buffering the impact force is shortened.

  2. Description of the Related Art Conventionally, a structure in which a side wall portion of a cylindrical member is provided at a corner of an object to be packed using a cardboard cushioning material has been proposed (see, for example, Patent Documents 1 and 2).

  In addition, a structure has been proposed in which not only energy absorption by elastic deformation but also energy absorption by plastic deformation is positively utilized to improve impact protection and thereby improve product protection performance. In this case, a shock-absorbing material is provided with a hollow projecting structure, and the impact is absorbed by deformation of the projecting structure (see, for example, Patent Document 3).

Furthermore, in addition to the protruding structure, a structure in which a notch is provided in a cushioning material that supports an object to be packed to promote plastic deformation has been proposed (see, for example, Patent Document 4).
Japanese Patent Laid-Open No. 09-12063 Japanese Patent Laid-Open No. 08-324645 JP 2007-22591 A Japanese Patent Application Laid-Open No. 2004-1882

  However, in the energy absorbing structure using the buckling described above, the corrugated cardboard sheet crushed by the impact force remains as a highly rigid member on the cushion stroke line as shown in FIG. There is a problem that the gap between and cannot be effectively used for buffering.

  Further, the cushioning material having a complicated structure can be applied only to a specific packaged item, and the manufacturing cost is high.

  Therefore, the present invention has been made in view of the above problems, and in the packaging of electronic equipment, a cushioning material capable of sufficiently securing a cushioning stroke with a simple manufacturing and reducing the gap between the outer box and the built-in equipment. The purpose is to provide.

  According to one aspect of the present invention, in the cushioning material that supports the object to be packed in the packing box, the side walls in the shape of a substantially isosceles trapezoid are adjacent to each other. A cushioning material is provided which is formed upside down and connected in a square tube shape over four surfaces.

  The cushioning material according to the present invention is formed using a corrugated cardboard sheet as a material.

  According to the present invention, the impact energy is absorbed by utilizing the breakage of the members constituting the cushioning material, and the cushioning stroke is ensured by retracting the collapsed members in a plane perpendicular to the load direction. it can.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same portions are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a perspective view of a cushioning material 10 according to an embodiment of the present invention. FIG. 2 is a developed view of the cushioning material 10 shown in FIG. In the buffer material 10, the side walls 1 having a substantially isosceles trapezoidal shape are adjacent to each other, and the upper and lower bases of the isosceles trapezoid are connected upside down over four surfaces. Further, the upper and lower portions of the cushioning material 10 have an open rectangular tube shape. As shown in FIG. 2, when the cushioning material 10 is unfolded, it can be seen that it has a single rectangular shape. In FIG. 2, the cushioning material 10 shown in the perspective view of FIG. The joint portion 3 of the cushioning material 10 can be joined and fixed by folding. Bonding, joining with tape, and joining by cutting a material sheet of the cushioning material 10 are also possible.

  As a material of the cushioning material 10, a cardboard sheet that is inexpensive and easily available is suitable. As the cardboard sheet, any of so-called A flute, B flute, and W flute can be used. Moreover, the sheet | seat formed by pulp molding with the used waste paper may be sufficient. In the following description, a corrugated cardboard sheet will be described as an example.

  When a force perpendicular to the surface of the opening is applied to the cushioning material 10 shown in FIG. 1, each side wall 1 of the cushioning material having a rectangular tube shape falls in the direction of the arrow shown in FIG. 1. . That is, the side walls with the long tops of the isosceles trapezoids approach each other, and the side walls with the short tops of the isosceles trapezoids fall apart in the far direction. At this time, an out-of-plane shear force acts on the bent portion 1 a of the adjacent side wall 1. The corrugated cardboard sheet constituting the cushioning material 10 is finally broken from the mountain fold or valley fold portion 2, and after the crushing shown in FIG. 3 (b) from the shape before crushing shown in FIG. 3 (a). Crush to shape. The folded portion of the corrugated cardboard sheet after crushing becomes two layers or less, and the gap between the packaged item and the outer box can be effectively used as a buffer stroke. That is, even after the cardboard sheet is torn, a buffering effect is exhibited. The front and back liners and the core of the corrugated cardboard sheet have a structure in which the constituent fibers are intertwined in a complicated manner. It is considered that the fiber breaks with a large energy absorption, and the energy absorption performance due to the break can be greatly expected.

  Here, suppose that the cushioning material is a cushioning structure that supports an object to be packed in a rectangular tube shape having four rectangular surfaces, and similarly, a case where a force perpendicular to the surface of the opening is applied is considered. Then, as shown in FIG. 4A, the cross-section of the corrugated cardboard sheet after crushing becomes a folded overlap of the corrugated cardboard sheet. In contrast, in the cushioning material according to the present embodiment, the cross-section of the corrugated cardboard sheet is stretched in the lateral direction as shown in FIG. For this reason, it is clear that a sufficient cushioning stroke can be obtained even when crushed.

  The shock-absorbing material according to the present embodiment is not limited to the above-described one, and several modifications can be considered, and various modifications will be described below.

  Fig.5 (a) is a perspective view of the shock absorbing material 10 which formed the notch 4 in the end point, FIG.5 (b) is the expanded view. By forming the notches 4 at the end points of adjacent isosceles trapezoids, crushing when a force perpendicular to the surface of the opening is applied is smoothly realized.

  FIG. 6 is a perspective view of the cushioning material 10 in which the skirt portion 5 is formed on the lower base of the isosceles trapezoid that forms the side wall 1. Since the skirt portion 5 is provided, there is an effect that stability when the cushioning material 10 is placed on the packaging box is increased. Since the skirt part 5 is not fixed to the packaging box, it does not hinder the crushing when a force perpendicular to the surface of the opening is applied.

  FIG. 7 is a perspective view of the cushioning material 10 in which the shape of the opening 6 forms a curved surface. The curved surface is determined in accordance with the shape of an object to be packed built in the packing box. When the object to be packed is securely supported and a force perpendicular to the surface of the opening 6 is applied, a sufficient cushioning stroke can be obtained even if crushing.

  Next, FIG. 8 is a perspective view of the cushioning material 10 in which the sizes of the isosceles trapezoids adjacent via the mountain fold or valley fold portion 2 are different. Generally, in the packing box, a plurality of cushioning materials 10 are arranged to support the packed object. However, when the packed object has a planar shape, the cushioning material shown in FIG. As a result, it is possible to more stably support the object to be packed.

  FIG. 9 is a development view when the buffer member 10 is connected to another structure 20 at one side 6 a of the opening 6. According to this modification, the cushioning material 10 and the structure 20 are integrated, so that when the object to be packed is supported, a force perpendicular to the surface of the opening 6 is more surely applied. An effect is obtained.

  According to the present embodiment, the impact energy can be absorbed by utilizing the breakage of the cardboard sheet, and the cushioning stroke can be ensured by retracting the collapse of the collapsed cardboard sheet into a plane perpendicular to the load direction. Thereby, the space | gap of a to-be-packaged item and an exterior box can be effectively utilized as a buffer stroke.

  By disposing a plurality of cushioning materials according to the present embodiment inside the outer box, it is possible to stably support an electronic device such as a PC that is an object to be packed. FIG. 10 is a perspective view schematically showing a case where four cushioning materials 10 are arranged inside an outer box 30 placed inside a packing box (not shown). The extra movement in the horizontal plane during the transportation of the PC to be packed is blocked by the outer box 30, and the shock in the vertical direction, particularly in the dropping direction, is absorbed by the cushioning material 10, so that the package is packed. The damage the PC receives can be negligible. In FIG. 10, for example, a flat cardboard sheet (not shown) can be interposed between the article to be packed and the cushioning material 10. When the shape of the lower surface of the packaged object is not flat, the height of each cushioning material 10 can be changed as appropriate, so placing the packaged object directly on the cushioning material 10 can also reduce member costs, Is preferred. On the other hand, when the shape of the lower surface of the object to be packed is flat, it is easier to place the object to be packed when the flat cardboard sheet is interposed, and the cushioning materials 10 are easily crushed evenly.

  Note that the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

It is a perspective view of the shock absorbing material which concerns on embodiment of this invention. It is the figure which expand | deployed the shock absorbing material shown in FIG. It is a figure explaining the shape before and behind crushing of a shock absorbing material. It is a figure explaining the case where a perpendicular | vertical force is added with respect to the surface of an opening part. It is the perspective view and expansion | deployment figure of the shock absorbing material which formed the notch in the end point. It is a perspective view of the shock absorbing material which formed the skirt part. It is a perspective view of the shock absorbing material in which the shape of the opening part has comprised the curved surface. It is a perspective view of the shock absorbing material from which the magnitude | size of an adjacent isosceles trapezoid differs. It is an expanded view at the time of making it connect with another structure in one side among the opening parts of a shock absorbing material. It is the perspective view which showed typically the case where four buffer materials are arrange | positioned inside an outer box.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Buffer material 1 ... Side wall 2 ... Broken line 3 in the expansion | deployment figure of a buffer material ... Joint part 4 ... Buffer part 5 ... Skirt part 6 ... Opening surface 20 ... Structural material 30 ... Outer box

Claims (8)

In the cushioning material that supports the item to be packed in the packing box,
The side walls in the shape of a substantially isosceles trapezoid are adjacent to each other, and the upper and lower bases of the isosceles trapezoid are formed upside down and connected over four surfaces to form a rectangular tube shape. Characteristic cushioning material.   The cushioning material according to claim 1, wherein a notch is formed at an end point of the adjacent isosceles trapezoid.   The cushioning material according to claim 1, wherein a skirt portion is formed on a lower base of an isosceles trapezoid that forms the side wall.   The cushioning material according to claim 1, wherein the opening formed in the rectangular tube shape is a curved surface matching the shape of the packaged object.   The cushioning material according to claim 1, wherein the adjacent isosceles trapezoids have different sizes.   The cushioning material according to claim 1, wherein the cushioning material is formed using a corrugated cardboard sheet.   The cushioning material according to claim 1, wherein the cushioning material is formed from a pulp mold.   A packaging box comprising an outer box and the cushioning material according to any one of claims 1 to 7 disposed in the outer box.

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