JPH06293101A - Core material in sandwich structure - Google Patents

Abstract

PURPOSE:To enhance the workability of a sandwich structure at the time of production by uniformly reducing the recovery force of a bent area to keep it in a favorably tensioned state. CONSTITUTION:Perforations being bending means and cutting lines are alternately formed to a core material to be tensioned and the opposed bending means of adjacent laminated sheets 2 are made different and bonding areas are bonded so as to leave three intervals between the adjacent sheets 2 and bonded at the interval of the intermediate region among three left intervals between two bonded sheets of one set.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core material in a sandwich structure which can be stretched to the maximum in the thickness direction of a sheet to reduce the restoring force at a bent portion.

[0002]

2. Description of the Related Art Conventionally, a sandwich structure having a plastic plate, a metal plate or the like as a surface material and a plastic foam, a honeycomb or the like as a core material has been used in various fields such as aircraft, vehicles, construction and furniture. There is.

However, in the honeycomb core material having the shape of a honeycomb, only the same bending means is provided at the bent portion when expanded, so that the hexagonal hollow cells are formed during the expansion process. Has a drawback that it cannot be a core material that maintains a good stretched state by applying a sufficiently large tension to uniformly reduce the restoring force of the bent portion. It was

[0004]

DISCLOSURE OF THE INVENTION According to the present invention, it is possible to extend the sheet in the thickness direction to the utmost limit, and to uniformly reduce the restoring force at the bent portion so that the stretched state can be maintained well. An object is to provide a core material for a sandwich structure that improves workability during manufacturing of the body.

[0005]

SUMMARY OF THE INVENTION In view of the problem that the restoring force of a bent portion cannot be reduced uniformly based on the above-mentioned prior art, the present invention has different bending means formed in the width direction of the seat. Provide a core material in a sandwich structure, which is made into a laminated structure and partially adheres each sheet to each other, thereby maximizing the expansion and reducing the restoring force at the bent portion. Therefore, the above-mentioned drawbacks are not solved.

As the core material in the sandwich structure according to the present invention, sheets having bending means are laminated and the sheets are partially bonded to each other.

The bending means has perforations and cutting lines, and is formed alternately at predetermined intervals in the width direction of the sheet, or when all of them are perforations, the degree of perforation of the adjacent perforations is set. It has strength and weakness.

The adhering portions are adhered to each other with an interval of 3 between adjacent sheets, and between the adjoining sheets of a set of two adhering sheets, an interval of an intermediate portion is included. Adhere to each other.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is a core material in a sandwich structure according to the present invention, and the core material 1 is a large number of sheets formed in a rectangular plate shape. 2 are laminated in the thickness direction and each sheet 2 is partially bonded.

Further, the perforation 4 which is the bending means 3 in the sheet 2 and the cutting line 5 are separated by a predetermined distance L in the width direction of the sheet 2.
The bending means 3 opposed to each other of the adjacent sheets 2 which are alternately formed by stacking the different sheets are positioned differently.

The sheet 2 may be made of aluminum, plastic, paper, etc., and may be of a single layer, or if it is plastic, it may be laminated, and if it is paper, it may be of a different type such as corrugated board. Alternatively, there is a multi-layered structure made of the same material.

Further, the cutting line 5 forms a V notch in the case of the single-layered sheet 2 or forms a slit in the sheet 2 of the multi-layered shape so that at least one layer is left. Thus, the cutting lines 5 are alternately formed on the front surface side and the back surface side of the sheet 2.

Further, the partially bonded bonding portions 6 are bonded at intervals of three spaces L between the adjacent sheets 2 and at the same time between the bonded two assembly sheets 7 as described above. Among the spaces L spaced apart from each other, the spaces L at the intermediate portions are bonded to each other.

Next, as another embodiment, all the bending means 3 are formed with perforations 4, and the perforations 4 are alternately formed with varying degrees of perforation.

Further, in order to make the degree of perforation of the perforations 4 strong and weak, in the rollers 8 and 8a that are vertically stretched and are rotationally controlled, the perforations 4 are formed in the axial direction of one roller 8. Square saw-teeth-shaped perforating teeth 9 for forming are provided at intervals of twice the above-mentioned interval L, and a guide groove 10 through which the perforating teeth 9 pass is formed on the other roller 8a.
By adjusting the upper and lower positions of 8a, the perforation degree of the perforations 4 to be perforated in the seat 2 is made more or less strong.

In order to form the cutting line 5, a continuous annular cutting blade (not shown) is used in place of the square saw tooth-shaped perforating tooth 9 in the same manner as the perforation 4.

Next, the operation of the core material in the sandwich structure according to the present invention will be described. First, when the core material 1 is expanded in the thickness direction of the sheet 2, the core material 1 is bent from the perforations 4 and the cutting lines 5 which are bending parts. As shown in FIGS. 3, 4, 6 and 7, the hollow cells 11 are continuously formed in the shape of a hexagonal honeycomb, and are bent and formed in a so-called honeycomb shape.

After that, the arrow A which is the width direction of the sheet 2
When the core material 1 is compressed in the direction, the perforations 4 which are the bent portions are further bent, that is, the perforations 4 serve as the bent tops, and the sheet 2 is bent into a substantially V shape, so that the sheet is originally bent into a honeycomb shape. Perforation 4 whose restoring force is not reduced by the degree
However, since it is bent to such a state, the restoring force is reduced to the same extent as the cutting line 5 which is the other bonding site 3.

[0019]

In summary, according to the present invention, in a core material in which sheets are laminated and the sheets are partially adhered to each other and stretched in the thickness direction of the sheets, the perforations 4 as the bending means 3 and the cutting lines 5 are the sheets 2. Different sheets are alternately formed in the width direction of the sheet at predetermined intervals L, and the different bending means 3 of the adjoining sheets 2 are located at different positions, and the adhering portion 6 is the adjoining sheet 2 at the same time.
In the space, three spaces L are bonded together, and between the bonded assembly sheets 7 of two sheets, the spaces L in the middle part among the spaces L separated by three are bonded together.
When the core material 1 is expanded in the thickness direction of the sheet 2 to form the hollow cells 11 in a honeycomb shape by bending, and then the core material 1 is compressed in the width direction of the sheet 2, the perforation 4 which is a bent portion is further bent. Even if the perforation 4 has a restoring force that is not substantially reduced by being bent into a honeycomb shape, the restoring force is reduced to the same extent as the cutting line 5 of another bending portion, so that the honeycomb shape is reliably retained. Therefore, workability in manufacturing the sandwich structure can be improved.

Further, the bending means 3 is formed with perforations 4,
Even when the perforations 4 are alternately formed with different degrees of perforation, in the case of the present invention, all of the bending means 3 are replaced with the perforations 4. Therefore, by omitting the device and the process for forming the bending means 3, the cost can be reduced as compared with the above-mentioned invention, and the practical effect thereof is extremely great.

[Brief description of drawings]

FIG. 1 is a front view showing a core material in which sheets according to the present invention are laminated.

FIG. 2 is a plan view and a front view of a seat.

FIG. 3 is a front view of the core material according to the present invention spread in a honeycomb state.

FIG. 4 is a perspective view of the core material.

FIG. 5 is a front view of the core material further compressed in the sheet width direction.

FIG. 6 is a front view of another embodiment of the above core material.

FIG. 7 is a perspective view of the same core material.

FIG. 8 is a front view of a roller for forming perforations.

9 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 2 Sheet 3 Bending Means 4 Perforation 5 Cutting Line 6 Adhesive Site 7 Assembly Sheet

Claims (2)

[Claims] 1. In a core material in which sheets are laminated, and the sheets are partially adhered to each other and stretched in the thickness direction of the sheets, perforations that are bending means and cutting lines alternate at predetermined intervals in the width direction of the sheets. Different bending means are formed between the adjacent sheets that are formed and laminated on each other, and the adhering portions are adhered with the above-mentioned space between the adjoining sheets with the above-mentioned gap of 3 between them. The above is 3 between the assembly sheets of the set.
A core material in a sandwich structure, characterized in that the spaces between the intermediate parts of the spaces separated from each other are adhered to each other. 2. The core material in a sandwich structure according to claim 1, wherein the bending means is formed of perforations, and the perforations are alternately formed with different degrees of perforation.