JP2004010131A - Composite shock absorbing material structure for packaging, and packaging method for plasma display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composite shock absorbing material structure for packaging at a low material cost, which is easily separable, is provided with a satisfactory shock absorbing characteristic resisting repeated shocks, and keeps a product in a stable shape in packing. <P>SOLUTION: A urethane foam first shock absorbing material 2 is fitted and inserted in a square recessive opening formed in a second shock absorbing material 1 made of a polyethylene foam material or a polypropylene foam material for making a composite shock absorbing material structure by combining a urethane foam material and a polypropylene foam material or a polyethylene foam material using no adhesive agent. The composite structure is mounted on the four corners of a plasma display panel (PDP) module which is a product. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a composite cushioning material structure for packaging and a method for packaging a plasma display device.
[0002]
[Prior art]
It is important to protect the product from impact during transport and storage, for which various packaging cushioning structures have been proposed.
[0003]
In particular, a plasma display device, that is, a plasma display panel (PDP) module has a discharge light emitting portion in a space between two glass plates, and the discharge light emitting portion has a cell structure in which a mixed gas is sealed. Therefore, the packaging is important because the cell may be destroyed when an external pressure is applied.
[0004]
Therefore, particularly when transporting a plasma display panel (PDP) module and a product employing the PDP module, the glass panel is protected by transport vibration and impact received during transport. I need.
[0005]
FIG. 6 is a perspective view showing a conventional cushioning material structure for packaging, in which a corrugated cardboard 12 is used as a core material to support a foamed urethane cushioning material 11, and the foamed urethane cushioning material 11 is bonded to the cardboard 12 with an adhesive 13. are doing.
[0006]
FIG. 7 is a perspective view showing another conventional packaging cushioning structure, in which FIG. 7A shows a state during assembly and FIG. 7B shows a state after assembly. It is composed of a tubular body 14 formed of paper or paper-based composite material and having a substantially L-shaped cross section, and two plate-like core bodies 16 made of synthetic resin foam inserted into the tubular body 14 and bonded by an adhesive 15. ing. This technique is disclosed in Japanese Utility Model Laid-Open No. 5-54336.
[0007]
FIG. 8 is a perspective view showing another conventional cushioning material structure for packaging, in which a rib-shaped portion 18 is provided in order to obtain a cushioning property with a cushioning material 17 formed by foaming a single polymer material.
[0008]
[Problems to be solved by the invention]
As described above, the conventional techniques illustrated in FIGS. 6 to 8 have the following problems.
[0009]
A first problem is that a block-shaped urethane cushioning material is adhered to a corrugated cardboard sheet using an adhesive or the like as a typical example of a conventional composite cushioning material, and is bent into a corner piece shape. When a urethane cushioning material is attached to a cardboard sheet, the cushioning property itself is good, but it cannot be separated at the time of disposal.
[0010]
The second problem is that a cardboard sheet may be used as the core material of the composite cushioning material. However, in a high humidity environment, there is a disadvantage that the cardboard sheet absorbs moisture and no longer functions as a core material.
[0011]
The third problem is that the cushioning material made of a single polymer foam material attenuates the impact on the product by crushing the shock absorbing ribs to protect the product or cracking the cushioning material itself. I do. The cushioning material once cracked or deformed due to the shock absorption has a problem that the damage to the product increases if the cushioning material is repeatedly subjected to the shock without being restored to the cushioning characteristics before receiving the shock.
[0012]
Accordingly, an object of the present invention is to provide an effective composite cushioning material structure for packaging that has solved the problems of the prior art.
[0013]
[Means for Solving the Problems]
A feature of the present invention resides in a composite cushioning material structure for packaging having first and second cushioning materials having different cushioning characteristics each other, and incorporating the first cushioning material in the second cushioning material. It is preferable that the first buffer material and the second buffer material are arranged in a direction in which the required buffer action is required.
[0014]
Further, it is preferable that the first buffer material is a foamed urethane material, and the second buffer material is a foamed polypropylene material or a foamed polyethylene material.
[0015]
Further, it is preferable that the first buffer material and the second buffer material have a structure that can be easily separated by combining without using an adhesive.
[0016]
Further, it is preferable that a concave portion is formed in the second cushioning material, and the first cushioning material is inserted into the concave portion by fitting it. In this case, the opening shape of the concave shape may be a quadrangle. Alternatively, the concave opening shape may be circular.
[0017]
Alternatively, a convex portion is provided on a side surface of one of the first and second cushioning materials, and a concave portion is provided on a side surface of the other cushioning material. By inserting the first cushioning material into the concave portion, the first cushioning material can be incorporated in the second cushioning material.
[0018]
Another feature of the present invention is a method of packaging a plasma display device using the composite cushioning material structure for packaging described above.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described with reference to the drawings.
[0020]
FIG. 1 is a perspective view showing the structure of the composite cushioning member according to the first embodiment of the present invention, and FIG. 2 is a perspective view showing how the composite cushioning member of FIG. FIG. 3 is a perspective view showing how the composite cushioning member of FIG. 1 is assembled.
[0021]
The composite cushioning member 21 according to the first embodiment shown in FIG. 1 has a cushioning material (second cushioning material) 1 obtained by molding a urethane foam material (first cushioning material) 2 with a foamed polypropylene material or a foamed polyethylene material. By inserting them into each other, a composite cushioning member is formed by combining them without using an adhesive.
[0022]
Thereby, it becomes a shock absorbing material for PDP module packing made of flat glass that withstands repeated impacts and has good shock absorbing properties.
[0023]
Then, as shown in FIG. 2, when transporting the plasma display panel (PDP) module 20 or the product 20 employing the PDP module, the composite cushioning member 21 is fitted into each of the four corners.
[0024]
As shown in FIG. 3, the packing cushioning material 21 is assembled by inserting a urethane foam cushioning material 2 into a foamed polypropylene molded product or foamed polyethylene material 1 as a frame as shown by an arrow.
[0025]
That is, in this embodiment, a urethane foam cushioning material 2 having a different cushioning property is inserted into a concave portion 3 molded in a foamed polypropylene molded product or a foamed polyethylene material 1 to form a composite cushioning member.
[0026]
According to the present invention, when an external impact is applied at the time of packing and transporting, first, the cushioning material molded from the expanded polypropylene or expanded polyethylene material starts to be deformed. Then, the impact is efficiently attenuated by the deformation of the urethane cushioning material having a good cushioning property.
[0027]
The cushioning material made of foamed polypropylene or foamed polyethylene material, which becomes the receiving part when packing the product, has a resilience like a rubber material compared to materials such as styrofoam, so it breaks into the cushioning material even if repeated impacts are applied The product can be held without the occurrence of the problem.
[0028]
However, as shown by the solid line in FIG. 9, when a constant acceleration is applied from the outside, only about 10 G can be reduced and accelerated, and the cushioning characteristic of the expanded polypropylene or expanded polyethylene material is shown by a solid line. When designing, the surrounding ribs may become abnormally thin and buckle.
[0029]
On the other hand, when the same constant acceleration is applied from the outside, the urethane sponge can reduce the acceleration to less than 10 G as shown by the dotted line in FIG. The volume can be made sufficient not to buckle.
[0030]
FIG. 4 is a perspective view showing an assembled state of the composite cushioning member 22 according to the second embodiment of the present invention. A plurality of concave portions 5 are formed in a cushioning material (second cushioning material) 4 formed of a foamed polypropylene or foamed polyethylene material as a frame body. By inserting a cylindrical cushioning material (first cushioning material) 6 with a different foaming ratio, for example, a cylindrical urethane sponge, as shown by arrows, and inserting the same, composite without using an adhesive. A cushioning material can be formed.
[0031]
FIG. 5 is a perspective view showing an assembled state of the composite cushioning member 23 according to the third embodiment of the present invention. In order to attach a urethane foam cushioning material (first cushioning material) 8 to a cushioning material (second cushioning material) 7 molded from a foamed polypropylene or foamed polyethylene material as a frame, a concave portion 9 is provided on a side surface thereof. A convex part 10 is formed on the side surface of the urethane foam cushioning material 8, and the convex part 10 is fitted into the concave part 9 as shown by an arrow and inserted into the composite part without using an adhesive. A cushioning material can be formed.
[0032]
Further, in this case, a convex shape may be provided on the side surface of the second cushioning material 7, and a concave shape fitting into the convex shape may be provided on the side surface of the first cushioning material 8, and the two may be combined.
[0033]
【The invention's effect】
The first effect of the present invention is that a buffer material of a different material can be easily joined and separated.
The reason for this is that a recessed hole is formed in a foamed polypropylene or foamed polyethylene material serving as a frame of the cushioning material, and a different kind of cushioning material is inserted so as to fill the hole. The different types of cushioning materials are molded or cut one size larger than the concave holes formed in the frame so as not to fall off by their own weight. This is because the separation can be easily performed by picking out different kinds of buffer materials.
[0034]
The second effect is that it is possible to obtain a good shock absorbing property against repeated impact.
The reason is that a single-piece foamed polypropylene or foamed polyethylene material absorbs shock due to crushing of itself, but it cannot withstand the impact repeatedly because it cannot be completely restored to its original state after receiving a single impact Absent. This is because the urethane foam molded article can return to its original shape and can withstand repeated impacts.
[0035]
A third effect is that a stable product shape can be provided at the time of packing.
The reason is that a molded article of expanded polypropylene or expanded polyethylene used as a frame body can be manufactured by a molding machine to form a stable product shape.
[0036]
The fourth effect is that material costs can be reduced.
The reason is that urethane having a good cushioning property is more expensive than a foamed polypropylene molded product. This is because the material cost can be reduced by using a composite product rather than using a single urethane buffer.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a composite cushioning member according to a first embodiment.
FIG. 2 is a perspective view showing a state in which a composite cushioning member is attached to a PDP module for transportation and packaging.
FIG. 3 is a perspective view showing assembly of the composite cushioning member according to the first embodiment.
FIG. 4 is a perspective view showing assembly of a composite cushioning member according to a second embodiment.
FIG. 5 is a perspective view showing assembly of a composite cushioning member according to a third embodiment.
FIG. 6 is a perspective view showing a conventional technique.
FIG. 7 is a perspective view showing another conventional technique.
FIG. 8 is a perspective view showing another conventional technique.
FIG. 9 is a view showing characteristics of a cushioning material.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 cushioning material 2 foamed urethane material 3 concave shape portion 5 concave shape portion 6 cushioning material 7 cushioning material 8 foamed urethane cushioning material 9 concave shape portion 10 convex shape portion 11 foaming urethane buffer material 12 cardboard 13 adhesive 14 cylindrical body 15 bonding Agent 16 Synthetic resin foam plate-shaped core 17 Buffer material 18 Rib-shaped part 20 Plasma display panel (PDP) module 21 Composite buffer member 22 in first embodiment 22 Composite buffer member 23 in second embodiment Composite buffer member according to the third embodiment

Claims (9)

A composite cushioning material structure for packaging, comprising first and second cushioning materials having different cushioning characteristics each other, wherein the first cushioning material is incorporated in the second cushioning material. The composite cushioning material structure for packaging according to claim 1, wherein the first cushioning material and the second cushioning material are arranged in a direction in which an expected cushioning action is required. 2. The composite cushioning structure for packaging according to claim 1, wherein the first cushioning material is a foamed urethane material, and the second cushioning material is a foamed polypropylene material or a foamed polyethylene material. The composite cushioning material structure for packaging according to claim 1, wherein the first cushioning material and the second cushioning material are configured to be easily separated by combining without using an adhesive. The composite cushioning material structure for packaging according to claim 1, wherein a concave shape is formed in the second cushioning material, and the first cushioning material is inserted into the concave shape portion by fitting it. . The composite cushioning material structure for packaging according to claim 5, wherein the concave opening shape is a quadrangle. The composite cushioning material structure for packaging according to claim 5, wherein the concave opening shape is circular. A convex portion is provided on a side surface of one of the first and second cushioning materials, and a concave portion is provided on a side surface of the other cushioning material. The composite cushioning material structure for packaging according to claim 1, wherein the first cushioning material is incorporated in the second cushioning material by inserting the cushioning material into the second cushioning material. A method for packaging a plasma display device, comprising packaging the plasma display device using the composite cushioning material structure for packaging according to any one of claims 1 to 8.

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