JPH0733169A - Cushioning material made of corrugated board and production thereof - Google Patents

Abstract

PURPOSE:To reduce an empty space between the packed article and packing box and improve cushioning function by elastic deformation before buckling, by cutting a corrugated board laminated-material, and corrugating one or both end faces intersecting the flute axis. CONSTITUTION:A cushioning material 1A is obtained by cutting a corrugated board laminated-material, by corrugating one end face 2 intersecting the flute axis, and by making the other end face 3 flat. The corrugated part of the cushioning material 1A has a shape consisting of a beam 4 and a pillar 5 supporting it, the beam 4 can slightly bend and also the lower part of the pillar 5 is small in ground contact area, therefore, when a vertical load is applied, the pillar 5 itself receives compression more or less and elastically deforms as a whole. Thus, the cushioning material does not exert adverse effect on a packed article, and the paper product can be easily disposed of after use, compared to foam plastic products.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cushioning material using a corrugated cardboard laminated material, particularly a cushioning material for packaging, and also includes a manufacturing method thereof.

[0002]

2. Description of the Related Art A laminated material obtained by laminating a large number of cardboards (usually single-sided cardboard) is sometimes used as a cushioning material for packaging. In many cases, it is applied to the four corners or surfaces of the packaged object to fix it in the packaging box and to reduce vibrations and shocks. It is replacing foamed plastic because it is easier to dispose of after use.

However, the corrugated board laminated material has a great directivity as it is and is not so suitable as a cushioning material.
Considering the direction in which a load is applied to a block of corrugated cardboard laminate, the compressive strength of the laminate is low in the direction perpendicular to the laminate surface, although it has a cushioning function. Attempts to address this by selecting the paper quality of the material and increasing the paper thickness would make the laminate expensive and impractical. In the flute axis direction, the compressive strength is large, but when it exceeds the limit, it suddenly undergoes buckling deformation, so the cushioning effect is low. In the third direction, the corrugated cardboard laminate is easily damaged when a load is applied,
not appropriate.

Even in the usage method in which the load is applied in the first direction, the deformation due to the load is likely to be a permanent set even at the beginning, and in the case of long-term transportation, the repeated deformations are piled up to increase the deformation amount. However, there is a problem that the gap between the object to be packaged and the packaging box becomes large and the cushioning action is lost.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to improve the above-mentioned drawbacks of a cushioning material using a corrugated cardboard laminate and to provide a structure that causes elastic deformation before buckling.
The purpose is to provide an enhanced buffer function. It is also within the scope of the present invention to provide a suitable method of making such a corrugated cushioning material.

[0006]

As shown in FIG. 1, a corrugated cardboard cushioning material of the present invention is formed by cutting a corrugated cardboard laminated material so that one or both of the end faces intersecting the flute axis are shown. Then, the buffer material (1A) is formed by forming one end surface (2) into an uneven surface. The other end face (3)
Is a plane. This cushioning material is used so that a load is applied in the direction of the flute axis of the corrugated board, that is, in the directions indicated by the up and down arrows in the figure.

There are many possible forms of this cushioning material, as described below.

FIG. 2 shows an example in which both of the end faces (2, 3) are made uneven, and this cushioning material (1B) is suitable for use alone.

Another embodiment is a cushioning material in which two or more end faces each having an uneven surface are stacked and integrated as shown in a practical example described later. Of course, there are two types of the above-mentioned one, one of which has an uneven surface and the other of which has both uneven surfaces.
A cushioning material in which one or more pieces are stacked and integrated is also included in the embodiments of the present invention.

The shape of the concavities and convexities is arbitrary, but typical ones are a sine curve and other waveforms, a sawtooth shape, a semicircle (both inside and outside a circle are possible) and a trapezoid. The sawtooth and the semicircle are continuous. It may be either intermittent or intermittent. Of course, it is possible to combine different uneven shapes.

The above cushioning material can be manufactured by cutting a corrugated cardboard laminated material. The cutting may be carried out by a method of pushing in a blade prepared in a concavo-convex shape, or by using a thread saw. Alternatively, cutting by jetting a fluid jet is also possible.

A preferred manufacturing method is to cut the corrugated cardboard laminate along the uneven surface intersecting the flute axis, and at the same time as or after the cutting, spray an adhesive liquid onto the cut surface to fix the corrugated board cutting end. It consists of Paper dust is generated along with the cutting, which is often harmful to the object to be packaged, so that it is fixed by an adhesive to prevent scattering. As the adhesive, vinyl acetate emulsion or starch paste is easy to use, but any other adhesive can be used.

The latter of the two aspects of the above manufacturing method,
In other words, a practical mode is one in which the step of spraying the adhesive liquid after the cutting is performed, and the step of vacuuming the cutting portion at the time of cutting to remove the generated paper dust is added.

[0014]

The block of the corrugated cardboard laminated material having the shape and size shown in FIG. 3A was subjected to a compression test in which a load was applied in the flute axial direction, and the result shown in FIG. 3B was obtained. Of the three curves, the σ-S (stress-strain) diagram, in particular, shows that this block has a poor capacity as a cushioning material.

On the other hand, the cushioning material (1A) of FIG. 1 has a shape including a beam portion (4) and a column portion (5) supporting the beam portion (4), and the beam portion can be slightly bent. At the same time, since the ground contact area at the bottom of the column is small, the column itself receives some compression when a load is applied in the vertical direction, and it has elastic deformability as a whole.

In the cushioning material of the type shown in FIG. 2, since the same can be said with respect to the column portion of the cushioning material shown in FIG. 1 both above and below, the cushioning capacity is further increased.

[0017]

【Example】

[Example 1] Single-sided corrugated board (A flute, size C5)
Was laminated and cut to a thickness of 30 mm to obtain a cushioning material having a shape and dimensions as shown in FIG. 4A.

For comparison, a block of expanded polystyrene cushioning material (expanding ratio of about 100 times) was cut to obtain the same height 3
I prepared a rectangular parallelepiped with 7 mm.

The cardboard cushioning material and expanded polystyrene cushioning material of the present invention were subjected to a compression test. The curve obtained is shown in FIG.
Shown in B. You will notice that the curves are similar in shape.

[Embodiment 2] FIGS. 5A, 6A and 7A.
A compression test was performed on the cushioning material of
By drawing the strain curves, the graphs of FIGS. 5B, 6B and 7B were obtained.

[Embodiment 3] A two-stage corrugated cardboard cushioning material whose side surface shape and dimensions are shown in FIG. 8A was prepared. The curve is a sine curve. The upper and lower cushioning material parts are bonded with vinyl acetate emulsion glue.

In this case as well, the compression test was performed by comparing with the expanded polystyrene block having the same height. The result is shown in Figure 8.
As shown in B.

Example 4 A three-tiered corrugated cardboard cushioning material having a side shape shown in FIG. 9A was manufactured. The result of the compression test is shown in FIG. 9B.

[0024]

INDUSTRIAL APPLICABILITY The corrugated cardboard cushioning material of the present invention has various properties by properly selecting the paper quality, paper thickness, flute shape, etc. of the corrugated board used as the material, and the lamination thickness and the shape and size of the cut end surface irregularities. By using a combination of shapes, it is possible to have various cushioning properties, so that it can be used not only for the applications in which conventional foamed plastic cushioning materials have been used, but also for other applications. The ease of post-use processing, which is said to be advantageous for paper products over foamed plastic products, comes into play according to the invention.

By adopting the preferred method of the present invention in the production of the above corrugated cardboard cushioning material, it is possible to prevent the generation and scattering of paper powder from the cut end face, and there is no fear of adversely affecting the object to be packaged. A cardboard cushioning material can be manufactured.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a corrugated board cushioning material of the present invention.

FIG. 2 is a side view showing another example of the corrugated board cushioning material of the present invention.

FIG. 3 A) A perspective view showing a block of corrugated cardboard laminate; B) A graph showing the result of a compression test of this block.

FIG. 4 A) A side view showing the shape and dimensions of an example of a corrugated board cushioning material of the present invention; B) A graph showing the results of a compression test of this cushioning material in comparison with expanded polystyrene cushioning material.

FIG. 5) A) A side view showing the shape and dimensions of a first example of another example of the corrugated board cushioning material of the present invention; B) A graph showing the results of a compression test of this cushioning material.

6A is a side view showing the shape and dimensions of a second example of another example of the corrugated board cushioning material of the present invention; B) A graph showing the results of a compression test of this cushioning material.

7) A) A side view showing the shape and dimensions of a third example of another example of the corrugated board cushioning material of the present invention; B) A graph showing the results of a compression test of this cushioning material.

8A is a side view showing the shape and dimensions of an example of a stacking type corrugated board cushioning material of the present invention; B) A graph showing the results of a compression test of this cushioning material.

9A is a side view showing the shape and dimensions of another example of the cardboard cushioning material stacking type of the present invention; B) shows the results of the compression test of this cushioning material in comparison with expanded polystyrene cushioning material. FIG. Graph.

[Explanation of symbols]

 1A, 1B Cushioning material made of corrugated board 2 One end face 3 The other end face 4 Beam part 5 Column part

Claims (7)

[Claims] 1. A corrugated cardboard cushioning material obtained by cutting a corrugated cardboard laminated material and forming one or both of the end faces intersecting the flute axis into an uneven surface. 2. The corrugated cardboard cushioning material according to claim 1, wherein both of the end faces are made uneven and are used alone. 3. The one in which one of the end surfaces is a concave-convex surface is 2
The corrugated cardboard cushioning material according to claim 1, wherein at least one piece is stacked and integrated. 4. The corrugated cardboard cushioning material according to claim 1, wherein two or more of the end faces having one uneven surface and those having both uneven surfaces are stacked and integrated. 5. The corrugated cardboard cushioning material according to claim 1, wherein the shape of the unevenness is selected from a corrugated shape, a sawtooth shape, a semicircular shape, and a trapezoidal shape. 6. A corrugated cardboard laminate is cut along an uneven surface intersecting a flute axis, and an adhesive liquid is sprayed onto the cut surface to fix the cut end of the corrugated board at the same time as or after the cutting. A method for manufacturing a cardboard cushioning material. 7. The manufacturing method according to claim 6, further comprising a step of spraying the adhesive liquid after the cutting and removing the paper dust generated by vacuum suction of the cutting portion at the time of cutting.