JP2700995B2 - Corrugated board base - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corrugated cardboard base material used for interior materials such as vehicles, ships, houses, etc., and packing.

[0002]

2. Description of the Related Art A corrugated cardboard substrate is lightweight and relatively easy to process, so that it is used not only as a cardboard box for packing but also as an interior material for vehicles, ships or houses. A general configuration of a corrugated cardboard substrate is composed of a core formed into a wave pattern that repeats continuously, and a liner provided on both sides or one side of the core. It is stuck by an agent or a thermoplastic resin film. In addition, such a corrugated cardboard substrate,
Depending on the purpose of use, it is required to change the thickness, rigidity or strength. In the case of changing the thickness of the cardboard substrate, the simplest method is to simply stack a plurality of the cardboard substrates and integrate them. Specifically, there are cases where a core with one runner is used and cases where a core with both runners is used. In the latter case, two liners are interposed between the cores, so the weight is reduced. There is a problem such as becoming larger.

Therefore, for example, it is conceivable to eliminate the liner between the cores, directly contact the tops of the corrugations of the respective cores, and bond the cores together to integrate them. However, in this case, if the waveforms are integrated in the same direction, the strength or rigidity with respect to the force received in the waveform direction becomes weak. As a method of solving this, the technique of Japanese Utility Model Laid-Open No. 57-134122 is analogized,
As shown in FIG. 4, it is conceivable that when the cores 53 are directly bonded to each other with the liner removed, the waveform traveling directions intersect at right angles, and an adhesive 60 is applied therebetween. The corrugated cardboard substrate 51 of FIG.
And the lower substrate half 52B are attached to each other. Here, the upper substrate half 52A and the lower substrate half 52B
Are the same configuration, and the respective base halves 52A, 52A
B is composed of a core 53 formed in a waveform that repeats continuously at the same height, and a liner 54 attached to one surface side of the core 53 with a thermoplastic resin film such as a polyethylene film. I have.

The technique disclosed in Japanese Utility Model Laid-Open No. 57-134122 has a structure in which a single liner is interposed and the waveforms are made to cross at right angles to each other, and two liners are interposed therebetween. However, there are still problems such as the increase in weight.

[0005]

However, it has been found that the following problem newly arises in the corrugated cardboard substrate shown in FIG. That is, the upper base material half 52A and the lower base material half 52B are arranged such that the liner 54 is located outside, the middle cores 53 intersect at right angles in the waveform traveling direction, and the adhesive is applied between the waveform tops. Through abutment with each other. As described above, if only the tops of the waveforms of the respective cores 53 are brought into contact, substantially point contact occurs, and a sufficient contact strength cannot be obtained because the contact area is small. Therefore, the core 53
In order to increase the bonding strength between them, a measure is taken to increase the bonding area by crushing a part of the cores 53 by applying force at the time of butting. However, in this method,
Since the corrugated cardboard substrate 51 is generally a fibrous material such as pulp and has almost no elasticity itself, the crushed portion crushes the waveform itself as shown by a matte pattern portion 60 in FIG. Will decrease. In consideration of such a problem, it is necessary to select a high quality and high price material for the cardboard base material 51.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a lightweight and inexpensive corrugated cardboard substrate which is excellent in rigidity or bonding strength.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention uses two cores, each of which has a corrugated shape and a liner attached to one side of the corrugation, and the cores are connected to each liner. A corrugated cardboard substrate that is laminated and integrated in a state where its waveform traveling directions intersect at a substantially right angle while being positioned on the outside, wherein at least one of the two cores has a height of the waveform. The gist is that they are formed alternately, and the cores are integrated by abutting the tops of the large waves relatively stronger than the tops of the small waves. In the above configuration, the two cores have the same shape,
More preferably, the original shape of the small wave in each of the cores is maintained, and the tops of the large waves are abutted by a predetermined pressing force. By using the same core, mass productivity is also excellent.

[0008]

According to the above construction, when abutting each other, the tops of the large waves are crushed according to the degree of the abutment and are joined to the tops of the waves of the other party, and the tops of the small waves are hardly collapsed structurally. It comes into contact with the top of the opponent's wave and remains in its original shape. Accordingly, a sufficiently large contact area is obtained at the top of the crushed large wave to secure the bonding force, and the shape retention strength as designed is maintained in the small wave portion remaining in the original state.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 3 show an embodiment of the present invention. FIG. 1 is an exploded perspective view, FIG. 2 is a sectional view of a main part thereof, and FIG. 3 is a schematic view showing the principle of the present invention.

In FIGS. 1 to 3, the corrugated cardboard substrate 1 has the same structure as the upper substrate half 2A and the lower substrate half 2B. Is formed. Each of the base halves 2A and 2B is composed of a core 3 and a liner 4 attached to one surface of the core 3 with a thermoplastic resin film such as a polyethylene film. The core 3 is formed into a waveform by alternately repeating a large wave 3a having a height of H1 and a small wave 3b having a height of H2. The valley 3c is attached to the liner 4 so that the core 3 and the liner 4 are previously integrated. Has been Therefore, in appearance, the large waves 3 in each of the substrate halves 2A and 2B
The vertex 5 of a protrudes from the vertex 6 of the small wave 3b.

When the upper substrate half 2A and the lower substrate half 2B are bonded to each other, the liner 4 is turned outward as shown in FIG. They are crossed at right angles, an adhesive such as hot melt is applied between them, and then they are adhered to each other.
Further, at the time of the abutting, for example, until the large wave 3a and the small wave 3b lightly contact each other (in this case, the small waves 3b of the respective cores 3 intersect in a non-contact manner).
b Pressing force is applied between the upper substrate half 2A and the lower substrate half 2B until the members come into light contact with each other. When this force is applied, the intersections of the large waves 3a that are in contact with each other are crushed together (intersections 7 shown in a satin pattern in FIG. 1), and the contact areas of the crushed intersections 7 with each other And the joining force at the intersection 7 increases. on the other hand,
The small wave 3b does not touch the top 6 of the other small wave 3b without the top 6 being crushed (in the former case) or simply touches (in the latter case).
It remains in its original shape.

FIG. 3 shows the principle of the present invention. In the case where the base halves 2A and 2B of the above embodiment are used, the distribution of the crushed (cross-wave 3a) intersections 7 is schematically shown. I have. Solid lines indicate the large waves 3a and small waves 3b of the core material 3 in the upper substrate half 2A, and broken lines indicate the large waves 3a and small waves 3b of the core material 3 in the lower substrate half 2B. The core members 3 are attached in a state where the waveform traveling directions intersect at right angles. Here, the intersection of each big and small wave 3a, 3b is
There are a total of 16 locations, the intersections 7 (4 locations) of large waves 3a shown by large black circles, the intersections (8 locations) of large waves 3a and small waves 3b shown by triangles, and small waves 3b shown by small black circles Intersections (4 places) of comrades are scattered. Each of these intersections is crushed sequentially from the highest of the waves when they meet.

As described above, according to the present invention, it is sufficient that at least one of the two cores 3 alternately forms the height of the waveform, and the cores 3 are pressed together to be integrated. In other words, the top of the large wave 3a is relatively stronger than the top of the small wave 3b. When this is embodied as in the embodiment, the intersection of the large waves 3a shown by large black circles can be made to have a greater degree of abutting than the other intersections,
The purpose of the present invention is to increase the joining force by interspersing the crushed intersections 7. In this example, the structure of FIG.
Since only the crushed portions are crushed and the crushed portions are regularly dispersed, the entire waveform is not crushed as shown in FIG. 4 to reduce the overall rigidity. In other words, in the structure of the corrugated cardboard substrate 1, a predetermined bonding force can be obtained without interposing a liner or the like used in the conventional structure between the cores 3. It becomes possible.

[0014] In this type of corrugated cardboard substrate,
In order to increase the rigidity, a technique of impregnating a reinforcing resin such as thermoplastic resin has been adopted. When such a resin is impregnated, in the corrugated cardboard base material of the present invention, the number of crushed portions is relatively smaller than that of the structure of FIG. 4 (only 25% of all intersections are crushed in the example), Since it is less likely to become an obstacle when the resin flows into the base material, the impregnation is performed uniformly without any unevenness. This is also excellent.

In the above embodiment, the large wave 3a
And the small wave 3b are alternately and regularly provided. However, the present invention discloses a structure in which the large wave 3a, the large wave 3a, and the small wave 3b are provided.
b, large waves 3a, large waves 3a, and so on, and large waves 3a, small waves 3b, small waves 3b, large waves 3a
The combination can be arbitrarily set, such as increasing the number of small waves. Also, the case where the same structure is used for both the cores 3 has been described, but the one in which the large waves 3a and the small waves 3b are formed in one of the cores 3 and the same height is used for the other It is also possible to use a waveform provided with the waveforms (1) and (2) so as to match each other.

[0016]

As described above, the cardboard base material according to the present invention is excellent in rigidity or strength without using the liner interposed between the cores in the conventional structure. Since no material is used, the weight can be reduced, and the material cost can be reduced and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a cardboard substrate according to one embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a corrugated cardboard substrate according to one embodiment of the present invention.

FIG. 3 is a schematic diagram for explaining the principle of the present invention.

FIG. 4 is an exploded perspective view showing a configuration example of a corrugated cardboard substrate inferred from the prior art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Corrugated board base material 2A Upper base material half 2B Lower base material half 3 Core 3a Large wave 3b Small wave 4 Liner 5 Big wave apex 6 Small wave apex 7 Crushed intersection

Claims (2)

(57) [Claims] 1. Using two cores, each of which is corrugated and has a liner attached to one side thereof, the corrugated direction of the corrugations is substantially perpendicular to each other with the respective cores positioned outside each liner. A corrugated cardboard substrate that is laminated and integrated in an intersecting state, wherein at least one of the two cores has a wave height that is alternately large and small. A corrugated cardboard substrate, wherein the top of the corrugated cardboard is integrated with the top of the wavelet relatively stronger than the top of the wavelet. 2. The method according to claim 1, wherein said two cores have the same wave shape alternately formed in large and small, and the original shape of the wave in each of said cores is maintained, and the tops of said large waves are butted against each other with a predetermined pressing force. Item 10. The cardboard substrate according to Item 1.