JPH10329251A - Structure with plural layer waveshape plate with optimum high-to-low ratio - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure having a plural layer waveshape plate of an optimum high-to-low ratio for ensuring high compression strength by suppressing a decrease in abrupt compression strength after the plate is bent, suppressing an increased amount of the compression strength due to an increase in an initial compression deforming amount, and incorporating an initial cushioning effect. SOLUTION: In the structure 7 having a high waveshape plate 3c and a low waveshape plate 3d of different heights between two flat plates 1 and 2, when a high-to-low ratio (Hlow/Hhigh) of the plate 3d to the plate 3c is set to 5 range from high-to-low ratio for deforming the plate 3d in a trapezoidal shape to a high-to-low ratio for bringing the plate 3d into contact with the plate 3c when compression forces are applied perpendicularly to the plates 1, 2 to deform the plate 3c in a rectangular section. More particularly, it is set to a range of 0.8 to 0.95.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure composed of two flat plates and a corrugated plate between them, such as a cardboard used as a packaging material. And a structure having two or more layers of corrugated plates having different heights.

[0002]

2. Description of the Related Art A structure of this type is generally manufactured by disposing a corrugated plate 3 between a flat plate 1 and a flat plate 2 as shown in FIG. It is provided as a single-layer corrugated plate structure 5.

[0003] The plane compression characteristics of the structure 5, that is, the compression characteristics when a compressive force is applied vertically to the two flat plates 1 and 2 appear as shown in FIG. 2 according to the experimental results. FIG. 3 is an explanatory diagram of the deformation behavior of the corrugated plate 3 during this time.

At a point a in FIG. 2 before a compressive force is applied, the corrugated plate 3 constituting the structure 5 has a mountain peak shape as shown in FIG. Compressive strength of structure 5 (P)
Increases as the amount of compressive deformation (δ) increases, and forms a first peak at point b. The cross-sectional shape of the corrugated plate 3 at this time is a trapezoid as shown in FIG. Thereafter, the compressive strength (P) of the structure 5 further increases as the amount of compressive deformation (δ) increases, and a second peak is formed at the point c. The cross-sectional shape of the corrugated plate 3 at this time is a rectangle as shown in FIG. Thereafter, since the corrugated plate 3 bends, the compressive strength (P) at the point c becomes the maximum value, and the compressive strength (P) rapidly decreases as the amount of compressive deformation (δ) further increases.

[0005] In order to have a greater compressive strength than the corrugated plate structure 5, a corrugated plate structure provided with two corrugated plates 3 is provided. Double corrugated plate structure 6
As shown in FIG. 4, a corrugated plate 3a and a corrugated plate 3b bonded by an adhesive 4a are arranged between a flat plate 1 and a flat plate 2, and these are bonded by an adhesive 4b.

[0006] As a result of close analysis, the planar compression characteristic of the structure 6 appears as in the case of the corrugated plate structure 5 as shown in FIG. FIG. 6 is an explanatory diagram of the deformation behavior of the corrugated plates 3a and 3b during this time.

At the point a in FIG. 5 before the compressive force is applied, the corrugated plates 3a and 3b constituting the structure 6
It has a mountain peak shape as shown in FIG. Structure 6
The compressive strength (P) increases as the amount of compressive deformation (δ) increases, and forms a first peak at point b. At this time, the corrugated plates 3a and 3b have a trapezoidal cross-sectional shape as shown in FIG. Thereafter, the compressive strength (P) of the structure 6 further increases as the amount of compressive deformation (δ) increases, and forms a second peak at the point c. Corrugated plate 3 at this time
The cross-sectional shapes of a and the corrugated plate 3b are rectangular as shown in FIG. Thereafter, since the corrugated plate 3a and the corrugated plate 3b are bent, the compressive strength (P) at the point c becomes the maximum value, and the compressive strength (P) rapidly decreases as the amount of compressive deformation (δ) further increases.

In the double corrugated plate structure 6 having two corrugated plates 3a and 3b, as compared with the one-layer corrugated plate structure 5 indicated by a broken line in FIG. It can be seen that the initial increase in the strength (P) is large and the first and second peak values of the compressive strength (P) are large.

[0009]

As described above, the one-layer corrugated plate structure 5 has the maximum compressive strength when the corrugated plate 3 is rectangular as shown in FIG. 3 (c). Since 3 is bent, there is a problem that the compressive strength (P) rapidly decreases. Also, the amount of compressive deformation (δ) shown in FIG.
-In the compressive strength (P) curve, the total compressive strength (P *) determined by the area surrounded by the horizontal axis and the δ-P curve
(See FIG. 12) is considerably lower than the double corrugated plate structure 6.

Since the double corrugated plate structure 6 has two corrugated plates, the total compressive strength (P *) is higher than that of the corrugated plate structure 5, but as shown in FIG. Heavy corrugated plates 3a, 3
When b becomes a rectangle, the compression strength becomes the maximum, and since the corrugated plates 3a and 3b are bent at the boundary, there is a problem that the compression strength (P) is sharply reduced similarly to the corrugated plate structure 5. Further, since the initial increase amount of the compressive strength (P) is larger than that of the corrugated plate structure 5, there is almost no initial buffer effect. This initial buffering effect is an important property in cardboard as a packaging material.

In order to suppress a sudden decrease in compressive strength after the corrugated plate is bent and to have an initial buffer effect, two corrugated plates are not used to form a double, but a gap between the corrugated plates is used. space)
And a structure configured such that the high corrugated plate and the low corrugated plate have two layers can be proposed.

The two-layer corrugated plate structure 7 is shown in FIG.
As shown in (B), a high corrugated plate 3c and a low corrugated plate 3d are arranged between a flat plate 1 and a flat plate 2, and these are bonded with an adhesive 4. Here, (A) shows the case where the height of the low corrugated plate 3d is slightly lower than the height of the high corrugated plate 3c, and (B)
Indicates a case where the height of the low corrugated plate 3d is extremely lower than the height of the high corrugated plate 3c.

FIG. 8 shows the plane compression characteristics of the double-layer corrugated plate structure 7 obtained based on detailed investigation results and experimental results. FIG. 8 is an explanatory diagram of the deformation behavior of the high corrugated plate 3c and the low corrugated plate 3d during this period. 9 and 10.

In the case of the structure 7 shown in FIG. 7A, that is, the structure 7 in which the height of the low corrugated plate 3d is slightly lower than the height of the high corrugated plate 3c, as shown in FIG. When the cross-sectional shape of the plate 3c becomes trapezoidal, the first compression characteristic shown in FIG.
When the peak (A) -b is generated, and thereafter, as shown in FIG. 9 (c), when the cross-sectional shape of the high corrugated plate 3c becomes rectangular, the second peak (A) -c appears on the plane compression characteristic of FIG. Occurs.
The compressive strength at the second peak (A) -c is lower than the second peak in the double corrugated plate structure 6 shown by a dashed line in FIG. The deformation behavior itself is similar to the double corrugated plate structure 6.

Further, as shown in FIG.
Since the low corrugated plate 3d becomes rectangular after c becomes rectangular, the third peak (A) -d follows the second peak (A) -c.
However, in the structure 7 shown in FIG. 7A, since the height difference between the high corrugated plate 3c and the low corrugated plate 3d is almost zero, the third peak (A) -d is low, and the double corrugated plate structure As in body 6, a sharp decrease in compressive strength (P) occurs after the second peak (A) -c.

In the case of the structure 7 shown in FIG. 7B, that is, the structure 7 in which the height of the low corrugated plate 3d is extremely lower than that of the high corrugated plate 3c, as shown in FIG. When the cross-sectional shape of 3c is rectangular, the second
A peak (B) -c occurs, and after that, the compression characteristics until the high corrugated plate 3c comes into contact with the low corrugated plate 3d substantially match those of the corrugated plate structure 5, but after the contact. Since the low corrugated plate 3d is deformed from a trapezoid to a rectangle, FIG.
As shown in FIG. 8D, when the cross-sectional shape of the low-corrugated plate 3d is rectangular, the third peak (B) −
d occurs. However, since the height of the low corrugated plate 3d is low, the third peak (B) -d is low, and the total compressive strength (P *)
Is substantially the same as that in the corrugated plate structure 5.

As described above, the planar compression characteristics of the two-layer corrugated plate structure 7 in which the height of the low corrugated plate 3d is slightly lower than the height of the high corrugated plate 3c are close to those of the double corrugated plate structure 6, and are low. The planar compression characteristics of the two-layer corrugated plate structure 7 in which the height of the corrugated plate 3d is extremely lower than the height of the high corrugated plate 3c are almost the same as those of the one-layer corrugated plate structure 5, and the double corrugated plate structure 6 And the above-mentioned problem in the corrugated plate structure 5 cannot be solved.

The present invention has been made in view of such circumstances, and by appropriately setting the height of the low corrugated plate 3d of the two-layer corrugated plate structure 7 with respect to the height of the high corrugated plate 3c. ,
Abrupt decrease in compressive strength after bending of the high corrugated plate 3c is suppressed, high compressive strength is secured, and only the high corrugated plate 3c is deformed in the initial stage of compression to reduce the initial increase in compressive strength (P). It is an object of the present invention to provide a structure capable of suppressing the occurrence of a desired initial buffer effect.

[0019]

According to a first aspect of the present invention, there is provided a structure having two or more layers of corrugated plates having corrugated sections having different heights between two flat plates. When the high and low ratio of the low corrugated plate changes to a trapezoidal cross section when the high corrugated plate is deformed into a rectangular cross-section by applying a compressive force perpendicular to the two flat plates, The corrugated plate is set in a range up to a height ratio at which the corrugated plate contacts the high corrugated plate.

In the present invention, when the high corrugated plate is deformed to have a rectangular cross-section, the low corrugated plate is deformed to a trapezoidal cross-section, and starts to be deformed by contact with the high corrugated plate. In the middle state, a sudden decrease in compressive strength due to bending of the high-corrugated plate having a rectangular cross section is suppressed by the action of the low-corrugated plate, and high compressive strength is secured. In the initial stage of compression, only the high corrugated plate is deformed, and the initial increase in compressive strength can be kept small, and a sufficient initial buffer effect can be obtained.

The structure according to the second aspect of the present invention is characterized in that the height ratio of the low corrugated plate to the high corrugated plate is 0.8 to 0.95.

In the present invention, the height ratio of the low-corrugated plate to the high-corrugated plate is set in the range of 0.8 to 0.95 to ensure a high compressive strength and a sufficient initial buffer effect. .

[0023]

FIG. 11 shows the height (Hhigh) of a high corrugated plate 3c in a two-layer corrugated plate structure 7 as shown in FIG.
Ratio of the height (Hlow) of the low corrugated plate 3d to the height (Hlow /
FIG. 10 is a diagram showing the results obtained by investigating and experimenting the relationship between the total compressive strength (P *) and the initial buffer amount (a) when Hhigh) was changed.

The total compressive strength (P *) is calculated from the area of the hatched portion, that is, the horizontal axis and the δ-P curve in the compressive deformation (δ) -compressive strength (P) curve shown in FIG. It is determined as the area enclosed. The initial buffer amount (a) is obtained as the reciprocal of the initial slope α of the δ-P curve.

As shown in FIG. 11, the total compressive strength (P *)
Starting from the compressive strength of the corrugated plate structure 5, it gradually increases as the height ratio (Hlow / Hhigh) increases, and then rapidly increases after the height ratio exceeds a predetermined height ratio. On the other hand, the initial buffer amount (a)
Despite the increase in the height ratio (Hlow / Hhigh), the initial buffer amount of the corrugated plate structure 5 is further kept substantially the same, and then rapidly decreases. The height ratio at which the initial buffer amount (a) sharply decreases is sufficiently larger than the height ratio at which the total compressive strength (P *) sharply increases.

Therefore, as shown in FIG. 11, the height ratio (Hlow / Hhigh) between the high corrugated plate 3c and the low corrugated plate 3d is determined by changing the ratio between the height at which the total compressive strength (P *) sharply increases and the initial buffer amount (a). )
By setting the height ratio between the height and the height ratio, the two-layer corrugated plate structure 7 having a high total compression strength (P *), a small initial buffer amount (a), and a large initial buffer effect can be obtained.

FIG. 13 shows a case where the two-layer corrugated plate structure 7 in which the height ratio (Hlow / Hhigh) between the high corrugated plate 3c and the low corrugated plate 3d is set to the optimum range shown in FIG. It is explanatory drawing of the deformation | transformation behavior of the high corrugated board 3c and the low corrugated board 3d.

The range of the optimum height ratio includes the height ratio where the cross-sectional shape of the low corrugated plate 3d is also rectangular as shown in FIG. 13B when the cross-sectional shape of the high corrugated plate 3c is rectangular. However, as shown in FIG. 13A, the cross-sectional shape of the low corrugated plate 3d is smaller than the trapezoidal height ratio, and as shown in FIG. 13C, the top of the low corrugated plate 3d is the high corrugated plate 3c. Greater than the height ratio that comes into contact with. Specifically, this range is a range in which the height ratio (Hlow / Hhigh) of the height of the low corrugated plate 3d to the height of the high corrugated plate 3c is 0.8 to 0.95.

FIG. 14 is an experimental result comparing the plane compression characteristics of the two-layer corrugated plate structure 7 having the above-described optimum height ratio with those of the single-layer corrugated plate structure 5 and the double-corrugated plate structure 6. FIG.

As shown by the solid line in the figure, in the two-layer corrugated plate structure 7 having the optimum height ratio, the amount of increase in the compressive strength with the increase in the amount of initial compressive deformation, in other words, as defined in FIG. The initial buffer amount (a) (the reciprocal of the initial slope α of the compressive deformation amount δ-compressive strength P curve) is almost the same as that of the single-layer corrugated plate structure 5 indicated by a broken line in FIG.

Further, in the two-layer corrugated plate structure 7 having the optimum height ratio, the compressive strength due to compressive deformation, in other words, the total compressive strength (P *) (compressive deformation amount δ−compressive strength) defined in FIG. Area surrounded by P curve and horizontal axis)
Is smaller than that of the double corrugated plate structure 6 indicated by a dashed line in the same figure, but is sufficiently larger than that of the single-layer corrugated plate structure 5 indicated by the broken line.

As described above, by optimizing the ratio of the height of the low corrugated plate 3d to the height of the high corrugated plate 3c, the initial buffer effect is higher than that of the double corrugated plate structure 6, and the more corrugated plate structure. It is almost the same as body 5. Further, the plane compressive strength is much higher than that of the corrugated plate structure 5. Further, after the high corrugated plate 3c is bent, the compressive strength does not suddenly decrease. Therefore, a corrugated plate structure having both high strength and a high initial buffer effect can be provided.

FIG. 15 is a diagram showing the measured results of the plane compression characteristics of the two-layer corrugated plate structure 7 in which the height ratio (Hlow / Hhigh) of the low corrugated plate 3d to the high corrugated plate 3c is 0.85. FIG. 16 shows the high corrugated plate 3c and the low corrugated plate 3d during this time.
FIG. 4 is an explanatory diagram of a deformation behavior of the. In FIG. 15, as a comparative example, the plane compression characteristics of the single-layer corrugated plate structure 5 and the double-corrugated plate structure 6 are indicated by broken lines and alternate long and short dash lines.

As shown in the figure, the amount of increase in the compressive strength (initial inclination) due to the increase in the amount of initial compressive deformation of the two-layer corrugated plate structure 7 is almost the same as that of the one-layer corrugated plate structure 5.
It can be seen that the compressive strength of the double-layer corrugated plate structure 7 due to compressive deformation is sufficiently higher than that of the single-layer corrugated plate structure 5 and close to that of the double-corrugated plate structure 6.

Hereinafter, the plane compressive deformation behavior of the two-layer corrugated plate structure 7 will be described in order. At point a on the deformation curve, the high corrugated plate 3c and the low corrugated plate 3d of the two-layer corrugated plate structure 7 both have a mountain-shaped cross-sectional shape as shown in FIG.
Next, at a point b, as shown in FIG.
Has a trapezoidal cross-sectional shape, the compressive strength increases, and a first peak occurs on the compressive deformation (δ) -compressive strength (P) curve in FIG. At this time, the low corrugated plate 3d is in a state where the peak shape is substantially maintained.

Next, at point c, as shown in FIG. 16 (c), the high corrugated plate 3c becomes rectangular and the low corrugated plate 3d becomes trapezoidal, so that the compressive strength increases sharply and the δ-P curve shown in FIG. A second peak occurs. After point c, high corrugated plate 3
Since c is bent, the compressive strength decreases, but the degree of the decrease is kept small by the deformation of the low-corrugated plate 3d, and FIG.
As shown in FIG. 15, since the cross-sectional shape of the low-corrugated plate 3d is rectangular, a third peak shown as a point d occurs on the δ-P curve in FIG. After that, the low corrugated plate 3d also bends,
In the state where c and the low corrugated plate 3d are bent, the compressive strength decreases after slightly increasing from the third peak because the high corrugated plate 3c and the low corrugated plate 3d resemble a rectangular shape.

In the above embodiment, the structure 7
The shape of the peaks and valleys of the high corrugated plate 3c and the low corrugated plate 3d is a circular arc, but may be configured by a combination of a circular arc and a straight line. As the material of the flat plates 1 and 2 and the corrugated plates 3c and 3d constituting the structure 7, various non-metallic materials such as paper, plastic, and composite materials, and various metal materials such as aluminum and steel can be used. Materials can be used.

FIG. 17 shows a case where the corrugated plate height ratio of the three-layer corrugated plate structure is optimized. In the three-layer corrugated plate structure 8 shown in this figure, the ratio (Hlow1 / Hhigh) of the height of the first low corrugated plate 3d to the height of the high corrugated plate 3c is set to 0.85, and the first low corrugated plate 3d is formed. The height ratio (Hlow2 / Hlow1) of the height of the second low corrugated plate 3e to the height of the plate 3d is also 0.85.
There is.

In the three-layer corrugated plate structure 8 as well, the shapes of the peaks and valleys of the corrugated plates 3c, 3d, 3e can be variously represented by arcs or straight lines. Plane plates 1 and 2 and corrugated plates 3c and 3
As the materials d and 3e, a wide variety of materials such as paper, plastic, composite materials, and metals can be used.

[0040]

As described above, according to the present invention, the same number of corrugated plates having no difference in height are stacked by forming a structure having a multilayer corrugated plate having an optimum height ratio. The initial buffer effect is higher than the structured structure, and the plane compressive strength is higher than the corrugated plate structure having one less corrugated plate and almost the same height. Further, compared to a corrugated plate structure formed by laminating the same number of corrugated plates, the material of the structure can be saved because the low corrugated plate is lower.

In a corrugated plate structure in which the same number of corrugated plates are stacked, the thickness of the corrugated plate is increased, so that it is difficult to process the shape of the corrugated plate. Since it does not become extremely large, processing of the shape of the corrugated plate becomes easy.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a single-layer corrugated plate structure.

FIG. 2 is a view showing a plane compression characteristic of the single-layer corrugated plate structure shown in FIG.

FIG. 3 is an explanatory view of a deformation behavior of the single-layer corrugated plate structure shown in FIG.

FIG. 4 is a schematic sectional view of a double corrugated plate structure.

FIG. 5 is a view showing a plane compression characteristic of the double corrugated plate structure shown in FIG. 4;

6 is an explanatory diagram of a deformation behavior of the double corrugated plate structure shown in FIG.

FIG. 7 is a schematic sectional view of a two-layer corrugated plate structure.

FIG. 8 is a view showing a plane compression characteristic of the two-layer corrugated plate structure shown in FIG. 7;

9 is an explanatory diagram of a deformation behavior of the two-layer corrugated plate structure shown in FIG. 7 (A).

FIG. 10 is an explanatory diagram of a deformation behavior of the two-layer corrugated plate structure shown in FIG. 7 (B).

FIG. 11 shows a height ratio (Hlow) of a corrugated plate of a two-layer corrugated plate structure.
/ Hhigh) and the relationship between the total compressive strength and the initial buffer amount.

FIG. 12 is an explanatory diagram of a total compression strength and a compression buffer amount.

FIG. 13 is an explanatory diagram of deformation behavior of a high corrugated plate and a low corrugated plate when a two-layer corrugated plate structure is compressed in a plane.

FIG. 14 is a diagram showing an experimental result in which the planar compression characteristics of a two-layer corrugated plate structure having an optimum height ratio are compared with those of a single-layer corrugated plate structure and a double-corrugated plate structure.

FIG. 15 shows a height ratio of a low corrugated plate to a high corrugated plate of 0.8.
It is a figure showing the measurement result of plane compression characteristics of the two-layer corrugated board structure set to 5.

FIG. 16 is an explanatory diagram of a deformation behavior of a two-layer corrugated plate structure having an optimum height ratio.

FIG. 17 is a schematic cross-sectional view of a three-layer corrugated plate structure having an optimum corrugated plate height ratio.

[Explanation of symbols]

 1, 2 plane plate 3, 3a, 3b, 3c, 3d, 3e corrugated plate 4, 4a, 4b adhesive 5 one-layer corrugated plate structure 6 double corrugated plate structure 7 two-layer corrugated plate structure 8 three-layer corrugated plate Structure

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ki-Jung Kim South Korea Gyeonggi-do 425-090, Ansan-shi, Bono-dong 872-20 Woosun Apartment 1-1001 (72) Inventor Seiji Seki Mihara, Hiroshima 5007 Itoki-cho, Mitsubishi Mihara Works, Ltd.

Claims (2)

[Claims] 1. A structure comprising two or more corrugated plates having a corrugated cross section having different heights between two flat plates, wherein a height ratio of the corrugated plates is higher than that of the two flat plates. When a high-corrugated plate is deformed into a rectangular cross-section by applying vertical compression force, the low-corrugated plate is transformed into a trapezoidal cross-section, and the low-corrugated plate comes into contact with the high-corrugated plate. A structure characterized in that: 2. The height ratio of a low corrugated plate to a high corrugated plate is:
2. The structure according to claim 1, wherein the ratio is 0.8 to 0.95.