JPH06104349B2 - Sun Germany Chipanel core material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a core material used for flash panels and the like.

(B) Conventional technology and its problems So-called sandwich type plywood such as a flash panel has a core material formed of a lightweight material such as paper or synthetic resin, and wood or another rigid plate-shaped member on both sides of the core material. It is formed by joining.

As the core material, a honeycomb core material having a large number of hexagonal cells, which is generally called a honeycomb core, is used.

Such a honeycomb core has a plurality of core rows 51, 52, 53 stacked in layers as shown in FIG. 3 (showing a contracted state) and FIG. 4 (showing an expanded state). It is configured by connecting.

As shown in FIG. 5, the core rows, for example, 51 and 52, are bent portions 54
And a pair of core webs 56, 57 or 58, 59 facing each other so as to define a cell 55 between the bent portions.

When the honeycomb core thus formed is pulled in the direction of arrow D-D shown in FIG. 3, the cells 55 and the cells 60 defined between adjacent core rows increase in area while It deforms to the expanded state as shown in FIG.

However, as apparent from a comparison between FIG. 3 and FIG. 4, the increase of the cell area accompanying the extension of the core in the DD direction inevitably results in an orthogonality to the above DD direction of each cell. In the direction of the core, that is, in the longitudinal direction of the core row, which reduces the width of the entire core.

In this way, the width of the core inevitably decreases as the core expands or expands, which means that when the core is inserted between plywood, the size of the core in a state of being contracted in advance according to the degree of expansion of the core Has to be determined, and because such a determination is extremely difficult considering the processing dimensional accuracy,
This is a major drawback, and improvement of this point has been desired.

In addition, when filling between the edge frame materials of the core, it may be desirable for the core to expand or contract at the same time in both the expansion direction and the width direction orthogonal thereto. However, the number of cores and the width of the core cannot be extended at the same time.

In order to solve the above problems, the inventor of the present application has already invented a special cell-shaped core material, which has already been the subject of a patent application (not yet published). The present invention is an improvement of the invention of this earlier application, and for convenience of explanation, the invention of this earlier application will be described first.

FIG. 6 is a plan view showing one embodiment of the core material of the first invention, in which the core material 1 is expanded by about 75% in the expansion direction (direction shown by arrow AA in FIG. 6). It is shown in the opened state. In FIG. 7, contracting in the direction of arrow C-C
The core is shown stretched 25%.

The core material 1 includes core rows 2, 3, 4 extending in a direction substantially perpendicular to the extending direction, that is, a width direction (direction indicated by an arrow BB in FIG. 6), and the above extending core rows. And side plate members 7 and 8 connected to both side portions in the direction. Although the number of core rows is three in this embodiment, the number of core rows can be arbitrarily selected according to the purpose and application.

Each core row has a top 9 and a bottom as shown in FIG.
It is formed by connecting a pair of core webs 11 and 12 of alternating 10 in a symmetrical, face-to-face relationship. The adhesive for this is indicated by AD. The core rows thus formed are
The outer side surface of 10 is aligned and overlapped and connected, and the side plate members 7 and 8 are connected to the outer sides of the core rows 2 and 4 on both sides to form the core 1 shown in FIG.

As the material of the core web, one-piece corrugated cardboard, both corrugated cardboard, a metal foil, a plastic sheet or the like can be used as well as a normal single layer paper.

The cores 1 formed as described above form one core row 1
The pair of core webs 11 and 12 has cells 13 and 14 defined between the top portions 9 and 9 facing each other and between the bottom portions 10 and 10 of the core webs of the adjacent core rows, and the cells 13 and 14 are defined as above. Both sides in the width direction are defined by a plurality of V-shaped side edges 15, 16, 17, 18 which extend inwardly of the cell.

In the above example, the adhesive AD is not provided on the entire area of the top portion 9 and the bottom portion 10 and only the substantially central portion thereof is provided, so that the portions indicated by 16 and 17 appear as the side edges of the cell. If the adhesive is placed all over the top and bottom, the V-shaped sides will only be formed by 15 and 18.

Thus, as is clear from FIG. 6, the plurality of V-shaped side edges are efficiently joined by joining the tops 9 and bottoms 10 partially rather than over the entire surface. It can be formed, but of course it is possible by forming a desired number of V-shaped sides from the beginning. An example of this case is shown in FIG.

When the bonding is performed partially, the length of the joint portion (the length d along the longitudinal direction of the core row) is preferably about 1/5 of the total length of the top portion 9.

Since each cell is configured to have such V-shaped side edges 15, 16, 17, and 18, the core is greatly extended in the extension direction (AA) shown in FIG. It becomes possible.

The side plate members 7 and 8 of the core 1 shown in FIG.
When the cells are separated in the extending direction, the side edges 15, 16, 17, 18 of each cell increase their narrow angle, as shown in FIG. 6, whereby each cell extends in the extending direction. Upon this expansion, the central portion of each cell tends to be displaced outward in the lateral direction, so that the core material tends to expand in the lateral direction rather than contract. However, in the example of FIG. 6, since the side plate members 7 and 8 are fixed to the upper and lower sides, the portions where the top portion 9 and the bottom portion 10 are joined are tilted as shown by the broken line in FIG. The lateral width of the entire material does not change significantly.

When the core 1 from which the side plate members 7 and 8 are removed is stretched in the stretching direction, it is also stretched in the width direction. That is, when the side plate member is removed and the core is formed only by the core rows, biaxial expansion occurs at the same time. Depending on the purpose of use, the core may be formed and used in this way. is there. For example, it can be applied to a sandwich panel composed of a spherical surface or a stretchable surface material.

The core material of the above-mentioned prior application has the excellent properties described so far, but since it has a large extensibility, when expanded, each cell becomes too large and the sound insulation properties may deteriorate. There is.

(C) Means for Solving the Problem In the present invention, the core web to be used is made up of at least two strips, and these strips may be adhered to each other at arbitrary positions. When the core material is stretched in the orthogonal direction, it is non-adhesive to the extent that it separates from each other in at least some cells, and the other belt material fills the space in the cell where one belt material is formed. Achieved

(D) Embodiment FIG. 1 shows one embodiment of the present invention in a state corresponding to FIG. 7, and the points not particularly described below are the same as those in FIG. In the present invention, each of the core webs 11, 12 comprises two strips W1 and W2. When the web consisting of these two strips is regarded as one sheet and bent and bonded in the manner shown in FIG. 8, some of the cells 13 and 14 can be displaced with respect to the outer layers of the inner layers thereof. The strips W1 and W2 are adhered to each other to the extent that the core material is not completely separated. Belt material W
An example of adhesion between 1 and W2 is shown by a white circle (AD ') as a different example between the core row 2 and the core row 4. A part of the core material in the state of being extended in the direction of A in FIG. 6 is shown in FIG.
It is shown in Figure 2B. It should be noted that in FIG. 1, the spacing between the strips is larger than the actual spacing for convenience of illustration, but such spacing is practically invisible. In the case of bonding as in the core row 2 in FIG. 1, when extended, the inner layer cannot follow the outer layer in every other cell, and fills the space in the cell with an appropriate shape (FIG. 2A). Increase the damping effect of. In addition, in the case of an adhesive mode such as the core row 4 in FIG. 1, the inner layer fills the cell space in all cells (see 2B).
Fig.), Not only the sound attenuation effect, but also the strength of the entire core material is made uniform, resulting in an improvement in strength. Furthermore, once the inner layer has been separated from the outer layer, it cannot return to its original position naturally, so the stretched state of the core material is prevented from returning to the position shown, and therefore it is not necessary to maintain the stretched state by hand. Workability is improved.

(E) Effect of the Invention The core material according to the present invention does not contract in the lateral direction due to the extension in the longitudinal direction, and in the case where the side plate members 7 and 8 are not used, the core material can be expanded and contracted in both the longitudinal and lateral directions. In addition, since a part of the band material fills the inside of the widened cell, a large degree of extension is possible without impairing the sound attenuation effect. It should be noted that this effect is particularly remarkable when the bending pattern as shown in FIG. 9 is used to increase the vertical elongation.

[Brief description of drawings]

FIG. 1 is a plan view showing a core material according to one embodiment of the present invention in a state where the degree of expansion is relatively small; FIG. 2A is a state in which the core material shown in FIG. 1 is greatly expanded. Fig. 2B shows a core row of another part in a state where the core material shown in Fig. 1 is greatly extended; Fig. 3 shows a contracted state of a honeycomb core of the prior art. FIG. 4 is a plan view showing an expanded state of a conventional honeycomb core; FIG. 5 is a plan view showing the structure of the core rows of the honeycomb core shown in FIG. 3; FIG. 7 is a plan view of the core material according to the invention in a greatly expanded state; FIG. 7 is a plan view of the core material of FIG. 6 in which the degree of expansion is relatively small; FIG. 8 is the formation of the core rows of FIGS. Explanatory drawing showing the method; FIG. 9 is an explanatory drawing showing the method of forming the modification of the core row of FIGS. 6 and 7. 11,12 …… Core web, 13,14 …… Cell, 15,16,17,18…
… Side, AD …… joint, W1, W2 …… Band material.

Claims (1)

[Claims] 1. A plurality of core rows each comprising a pair of strip-shaped core webs which are face-to-face connected and are formed so as to define cells therebetween, and the plurality of core rows are stacked in layers. Are connected to each other in a state so as to define cells surrounded by core webs between adjacent core rows, and the longitudinal direction of the core rows and the direction orthogonal to the longitudinal direction In the core material, each of the cells defined between the pair of core webs and the cells defined between the adjacent core rows has a length in the longitudinal direction of the core rows. In a core material that is configured to have at least two pairs of sides on each side that move inwardly of the cell when the core material contracts and are connected inside the cell, the core web comprises at least 2 Consists of at least one of these strips Sheets of strip, the core material, characterized in that that summer unbonded and as away from each other in at least some of the cells of said cell when elongation was achieved core in a direction orthogonal to the core sequence.