JPH0339423Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Technical Field] The present invention particularly relates to a packaging structure with a built-in cushioning material that protects lightweight articles from impact during transportation.

[Prior Art] Conventionally, when transporting lightweight articles, the article to be packaged is stored in a packaging box such as a cardboard box by filling the surrounding loose cushioning material. As this bulk cushioning material, granular materials or curved rod-shaped materials such as foamed polystyrene, foamed polyethylene, and foamed polyurethane are used.

It is also known that instead of the above-mentioned bulk cushioning material, a simple three-dimensional cushioning material such as a cube is interposed between the packaged item and the packaging box (Japanese Unexamined Patent Application Publication No. 1983-1999-1).
No. 46772, No. 50-73793).

[Problem to be solved by the invention] However, when using a packaging structure using bulk cushioning materials, the cushioning performance is greatly affected by the packing condition of the bulk cushioning materials, and there is a problem that requires skill and effort for packaging. be. Furthermore, if bulk cushioning materials are packed to such an extent that the packaged items will not shift during transportation, there is a problem that the cushioning effect tends to be insufficient, especially for lightweight items.

On the other hand, cushioning materials with a simple three-dimensional shape do not pose the problems mentioned above in the packing process, but because they mainly absorb shock through compressive deformation, the impact value (G
Since the static stress at which the minimum value (value) is the lowest is relatively large and its width is narrow, there is a risk that impact force absorption for lightweight articles will be insufficient. Furthermore, in order to solve this problem, if the material of the three-dimensional cushioning material itself is made flexible, a new problem arises in that the item to be packaged is likely to wobble within the packaging box.

The present invention has been made in view of the above problems, and aims to provide a packaging structure for lightweight articles that can sufficiently reduce the G value, has good localization within the packaging box, and is excellent in buffer protection.

[Means for solving the problem] The means taken in the present invention to achieve the above object are described in a first embodiment corresponding to an embodiment of the present invention.
To explain this with reference to the figures and FIG. A main cushioning material 6 made of a three-dimensional foamed resin that is parallel and has a notch 7 or a punch hole 10 penetrating through the middle part is fixed to the outer periphery of the internal holding member 1 on one side of its upper and lower surfaces, and on the other side to the packaging box. The packaging structure includes a built-in cushioning material that is interposed in contact with the inner surface of the container.

[Function] The sub-cushioning material 2 holds the packaged object 3 against the internal holding member 1.
It has a buffering function against the light and serves to firmly localize it.

When the main shock absorbing material 6 receives an external force, it not only compresses and deforms, but also functions to absorb the external force through various deformations such as bending and buckling. Main buffer material 6
The notch 7 or hole 10 formed in the main cushioning material 6 functions to cause various deformations of the main cushioning material 6.

The fact that the main cushioning material 6 is fixed to the internal holding member 1 prevents the main cushioning material 6 from shifting, and
This positioning allows the deformation behavior to occur as designed when an impact is applied. It also serves to prevent the shock transmitted to the main cushioning material 6 from being transmitted directly to the packaged object 3.

[Example] An example of the present invention will be described with reference to FIGS. 1 and 2.

As shown in the figure, the object to be packaged 3 is held between the internal holding member 1 from above and below via the auxiliary cushioning material 2.

The secondary cushioning material 2 is made of foamed resin such as polyethylene foam, and in order to improve its cushioning properties, it is preferable to form grooves 2b on the side in contact with the internal holding member 1.

The secondary cushioning material 2 is formed with stepped portions 2a into which the corners of the object to be packaged 3 are fitted. It is assigned.

An object to be packaged 3 held by the internal holding member 1 is enclosed in a packaging box 4 with a space 5 around it. Moreover, between the internal holding member 1 and the packaging box 4,
A main buffer material 4 is interposed.

As shown in an enlarged view in FIG. 3, the main cushioning material 6 is a three-dimensional foamed resin having a right-angled trapezoid shape with parallel upper and lower surfaces and an inclined surface, and a notch 7 extending through the middle. It is divided into an inclined columnar part 8 and an upright columnar part 9 by a notch 7. Further, the notch 7 has a triangular shape that roughly follows the outer shape, and the top thereof is a round hole 7a to alleviate stress concentration when the main cushioning material 6 is deformed.

When an external force is applied to the main cushioning material 6 having such a structure, compressive strain and buckling occur in the upright columnar portion 9 of the cushioning material 6, and tensile strain and bending strain occur in the inclined columnar portion 8. By deforming each of the pillars 8 and 9, the external force is effectively absorbed and the G value is reduced. Also round hole 7
a helps the buffering effect and relieves stress concentration.

Examples of the constituent material of the main cushioning material 6 include foamed resins such as polystyrene foam, polyethylene foam made of polyethylene or polyethylene copolymer, polypropylene foam, and polyurethane foam. Among these, polyethylene foam is preferred because it has excellent flexibility and toughness.

The main cushioning material 6 can be easily manufactured, for example, by punching out a flat plate obtained by extrusion foam molding using a press, or by performing in-mold foam molding from expandable beads.

Returning to FIGS. 1 and 2 for further explanation, the upper surface of the main cushioning material 6 is fixed to the internal holding member 1 by adhesive or the like, and the lower surface is in contact with the packaging box 4. ing. The position where the main cushioning material 6 is provided is preferably a position corresponding to the secondary cushioning material 2 as much as possible. This is to maximize the buffering effects of both the main buffer material 6 and the sub-buffer material 2.

4 and 5 show other embodiments,
The packaging structure is almost the same as the packaging structure shown in FIGS.
It has become something that is held in between.

6 and 7 each show other examples of the main cushioning material 6, and FIGS. 6a, b, and c each show a punch hole 10.
An example is shown below. Moreover, FIGS. 7a and 7b show examples in which other notches 7 are provided.

In the above embodiment, the main cushioning material 6 was provided only at the corners of the internal holding member 1, but it may be provided at an intermediate portion between the corners.

Figure 8 shows the static stress applied to the main buffer material 6 on the horizontal axis.
This is a graph in which Kg/cm ² is plotted and the G value is plotted on the horizontal axis. Curve A shows the one having the notch 7 used in the embodiment, and curve B shows the conventional one having a simple three-dimensional shape. In the figure, the lower the G value, the better the buffering effect.

As is clear from the figure, the G value of the material used in the example is low for a range of low static stress, that is, for lightweight objects. On the other hand, it can be seen that in the conventional type, the G value is extremely high for lightweight articles, and the curve rises sharply from the point showing the lowest G value, so that the range of use is limited.

[Effects of the invention] The invention is as described above, and has the following effects.

(1) Since the packaged object 3 is doubly protected from impact by the main cushioning material 6 and the secondary cushioning material 2, the protection is reliable.

(2) The main cushioning material 6 absorbs external forces through various deformations, so it has excellent shock absorption ability.
In particular, a high protection effect can be obtained for lightweight articles, and since the main cushioning material 6 is fixed to the internal holding member 1, it can function as designed, and the G
The value is constant and reliable.

(3) Since there is no need for stuffing work that is required when using bulk cushioning materials, packaging workability is excellent and the amount of cushioning materials used can be reduced.

(4) Since the main cushioning material 6 does not absorb shock only by compressive deformation, the material itself does not need to be very flexible, and the object to be packaged 3 can be firmly and oriented within the packaging box 4. can be done.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of one embodiment of the present invention, Fig. 2 is a longitudinal sectional view thereof, Fig. 3 is a front view showing an example of the main cushioning material, and Fig. 4 is a cross-sectional view showing another embodiment. Figures 5 and 5 are longitudinal sectional views thereof, Figures 6 a, b, and c are front views showing the cushioning material with punched holes, Figures 7 a and b are front views showing other notches, and Figure 8 is a relationship diagram between G value and static stress. 1...Internal holding member, 2...Sub-buffer member, 3...
...Packaged object, 4...Packaging box, 5...Space, 6...
...buffer material, 7...notch, 10...pull hole.

Claims (1)

[Scope of claim for utility model registration] Between an internal holding member that holds the packaged item via a secondary cushioning material and a packaging box that covers the outer periphery, there is a notch whose upper and lower surfaces are parallel and which penetrates through the middle part. The main cushioning material is made of foamed resin and has a three-dimensional shape having a hole or a hole, one of the upper and lower surfaces is fixed to the outer surface of the internal holding member, and the other is interposed in contact with the inner surface of the packaging box. Packaging structure with built-in cushioning material.