JPH06234174A - Paper core material - Google Patents

Abstract

PURPOSE:To provide a core material which can be formed easily and has a constant buckling strength in any direction, using a small quantity of paper as a raw material. CONSTITUTION:A paper cushioning material 2 is made of a corrugated sheet 21 and a plate 22. Both of them are made of single faced corrugated fiberboard. A paper core material 1 made of a plurality of layered paper cushioning materials 2 is used as a core material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core material made of paper and used as a core for doors, drawing boards, partitions and the like.

[0002]

2. Description of the Related Art As a paper core material, a honeycomb structure shown in FIG. 4, a quadrangular structure shown in FIG. 5, a paper tube parallel structure shown in FIG. 6, and a single-sided corrugated cardboard laminated structure shown in FIG. 7 are known.

[0003]

[Problems to be Solved by the Invention]

In the honeycomb structure and the quadrangular structure, the bonding surface 6 has a double structure material, the structure material is used more than other surfaces, and the strength is different from other surfaces. was there. The paper tube parallel structure has a thickness constraint that at least two or more paper tubes are stacked, and
There is a manufacturing problem that it is difficult to cut a large number of paper tubes uniformly while holding the perfect circle of the paper tubes. The single-sided corrugated cardboard laminated structure has a problem that the amount of material used is too large.

Using eco-friendly paper resources, using a small amount of materials, and easy to process without the need for advanced processing technology such as a parallel paper tube structure, a honeycomb structure,
The purpose of the present invention is to provide a core material in which the bonding surface 4 and other portions do not have different strengths unlike the rectangular structure and the buckling strength of any portion is uniform.

[0006]

[Means for Solving the Problems] FIG. 1A, FIG.
3 and FIG. 3, the paper cushioning material 2 and the paper core material 1 of the present invention will be described, but the present invention is not limited thereto.

As shown in FIG. 1A, the single-sided corrugated board 3 is used as a corrugated plate 21 and a flat plate 22 is used as another single-sided corrugated board 3.
Then, the corrugated plate 21 and the flat plate 22 are bonded together with the adhesive 6 to form the paper cushioning material 2. Liner 5 of corrugated plate 21 and flat plate 2
1A illustrates the case where the cores 4 of 2 are bonded together, but even if the liners 5 are bonded together, the flat plate 22 is attached to the cores 4 of the corrugated plate 21.
It may be attached to the liner 5 of.

Although the corrugated plate 21 has a substantially isosceles triangular shape in FIG. 1A, the corrugated plate 21 may have a corrugated shape.

The corrugated cardboard 3 used for the paper cushioning material 2 may be any of single-sided corrugated board, double-sided corrugated board, double-sided corrugated board, and triple-sided corrugated board, but the single-sided corrugated board 3 shown in FIG. Is preferable because it requires less amount.

A plurality of paper cushioning materials 2 (FIG. 1A) are laminated via an adhesive 6 to form the paper core material 1 of the present invention shown in FIGS. 1B and 2.

The corrugated plate 21 and the flat plate 22 are hot melt,
Adhesive 6 such as a vinyl acetate adhesive is used to bond the paper cushioning material 2
To form. The top of the corrugated plate 21 of the first paper cushioning material 2,
The flat plate 22 of the second paper cushioning material 2 is adhered and laminated using an adhesive 6 such as hot melt or vinyl acetate adhesive, and the lamination process is repeated to form the paper core 1 of the present invention.

The thickness and dimensions of corrugated board used as a material,
The size of the paper core material 1 may be formed according to the use as a core material and the required strength for each use.

The thickness of the paper core material 1 (depth in the drawings of FIGS. 1B and 2) is cut to the required thickness for use as a core material. Alternatively, for example, the pieces that have been cut in advance to have a thickness of 1 cm may be stacked and used. When they are used in a stacked manner, the shapes shown in the drawings may be used in the same manner, or they may be intentionally used in a stacked manner.

[0014]

EXAMPLE 1 FIG. 1B shows an example of the paper core material 1 of the present invention. Both the corrugated plate 21 and the flat plate 22 are made of single-faced corrugated board 3 and are bonded together with a hot melt adhesive 6 to form the paper cushioning material 2.
The corrugated plate 21 of the paper cushioning material 2 and the flat plate 2 of the other paper cushioning material 2
2 was bonded with a hot melt adhesive 6 to form a paper core material 1. The paper core material 1 has a shape similar to that of the single-sided corrugated board laminated structure shown in FIG.
While each liner 5 is a single paper sheet,
The corrugated plate 21 and the flat plate 22 of the present invention are not one paper sheet,
Since the single-sided corrugated board 3 is used, the strength is excellent.

[0015]

[Embodiment 2] FIG. 2 shows another embodiment of the paper core material 1 of the present invention. A paper core material 1 was formed in the same manner as in Example 1. However, unlike Example 1, in Example 2, the top part of the corrugated plate 21 was bonded 6 at the same position as the bonding part 6 between the corrugated plate 21 and the flat plate 22 of another paper core material 1. The shape of FIG. 2 can also be considered as a structure in which a new cushioning material is provided in one direction of the quadrangular structure (see FIG. 5).

[0016]

[Embodiment 3] FIG. 3 shows still another embodiment of the paper core material 1 of the present invention. The third embodiment is used as a main part of a drawing board. The paper core material 1 of the present invention is suitable because a lightweight and inexpensive core material is preferable, although it does not require so much strength for the use.

[0017]

[Embodiment 4] In FIG. 1B, a paper flute 2 having a flute single-faced corrugated board 3 as a flat plate 21 and a corrugated plate 22 and a pitch of the corrugated plate 22 of 30 mm and a height of the corrugated plate 22 of about 5 mm.
Was formed, and the paper-made cushioning material 2 was laminated to form a paper-made core material 1.

[0018]

[Comparative Example 1] Diameter = 36 using a paper having a thickness = 0.6 mm
mm paper tubes were formed, and the paper tubes were used to form the paper tube parallel structure shown in FIG.

[0019]

[Strength test] In FIG.
It was cut into a 00 mm square and a depth of 10 mm in the figure to obtain a test piece for the strength test of Example 4. In FIG. 6, the test piece of the strength test of Comparative Example 1 was obtained by cutting the upper and lower sides of the figure, the left and right sides, each 100 mm square, and the depth of the figure = 10 mm.

In addition to the test piece of Example 4 and the test piece of Comparative Example 1,
A strength test was performed by applying a load in the vertical direction of FIGS. 1B and 6. The test piece of Example 4 started to buckle under a load of 315 kg. The test piece of Comparative Example 1 started buckling under a load of 275 kg. Therefore, the buckling strength of the test piece of Example 4, ie, the paper core material 1 of the present invention, is about 15% stronger than the buckling strength of the test piece of Comparative Example 1, ie, the paper tube parallel structure.

[0021]

It has the same function as the core material of the prior art.

[0022]

The paper core material 1 of the present invention uses an eco-friendly paper material, and while saving the material to reduce the weight,
Realized high strength core material.

Different from the paper tube parallel structure, which requires a high level of processing technology, the honeycomb structure and the quadrangular structure, which have different strengths on the bonding surface and other parts, and the single-sided corrugated cardboard laminated structure in which a large amount of material is used for the same load. Is easy, has the same buckling strength in all directions, and can reduce the amount of material used for the same load.

[Brief description of drawings]

FIG. 1A is a diagram illustrating a paper cushioning material of the present invention. B
FIG. 3 is a diagram illustrating an example of the paper core material of the present invention.

FIG. 2 is a diagram illustrating another embodiment of the paper core material of the present invention.

FIG. 3 is a view explaining still another embodiment of the paper core material of the present invention.

FIG. 4 is a diagram illustrating a honeycomb structure.

FIG. 5 is a diagram illustrating a quadrangular structure.

FIG. 6 is a diagram illustrating a paper tube parallel structure.

FIG. 7 is a diagram illustrating a single-sided corrugated board laminated structure.

[Explanation of symbols]

 1 Paper core material 2 Paper cushioning material 21 Corrugated plate 22 Flat plate 3 Single-sided corrugated board 4 Core core 5 Liner 6 Adhesive 7 Drawing board 8 Top plate

[Procedure amendment]

[Submission date] November 20, 1993

[Procedure 3]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

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[Figure 7]

[Figure 5]

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Claims (2)

[Claims] 1. A cushioning material made of paper, which is obtained by laminating a corrugated sheet made of one-sided corrugated board and another one-sided corrugated board. 2. A paper core material obtained by laminating a plurality of paper cushioning materials according to claim 1.