JPS6290232A - Manufacture of core material with curved surface - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION ill Industrial Application Field The present invention relates to a method for manufacturing a core material having a curved surface.
・Not only between Nikumkoa and flat plates, but also like car bumpers or helmets, or the hull of FRP'H,
There is an increasing demand for nicum core, which can be filled between members having curved surfaces 7 to provide rigidity between these members.

Therefore, it is necessary to provide a core material that is bent so that the core material itself has a curved surface.

Examples of conventional curved cores include Watsuful type and Zureno-Nikam type core materials, but these core materials are formed into a spherical curved surface or other quadratic curved surface, and then In order to maintain its special shape, the core material is made only of materials that have the property of maintaining a certain shape, such as metal.

Such conventional curved cores are inconvenient due to the high resistance during stretching and molding operations, and the material costs are high, resulting in an increase in core material manufacturing costs. .

Therefore, it has been desired to develop a method for manufacturing a core material having a curved surface using a paper material that is easy to process and inexpensive.

(3) Object and structure of the invention The object of the present invention is to overcome the drawbacks of the core material of the prior art as described above, and to manufacture a core material with a curved surface using paper material f4, which is inexpensive and easy to handle. The best way to do it is to offer it.

The method for producing a core material having a curved surface according to the present invention includes the steps of forming a flexible belt-like sheet to have continuous peaks and troughs to obtain a plurality of corrugated sheets Y; In the troughs of the shaped sheet, one side of a band-shaped flat sheet made of paper material and deformable by humidification is connected to form a plurality of core rows, and a corrugated sheet forming each of the core rows. forming a core material by sequentially joining the other sides of the flat sheet constituting each of the core rows at the peak Q of the notebook, and adding humidity to the core material to make the flat sheet deformable. The method is comprised of a step of applying a load to the core material and molding it into a predetermined shape.

(4) Embodiments Next, embodiments of the present invention will be described with reference to the drawings.

Referring to FIG. 1, a core material 1 according to an embodiment of the present invention is shown, and this core material 1 includes a plurality of core rows 10a, 10
b+10c, 10d, 10e+1Of+10g, 10h
It consists of

Each core row has almost the same shape, and core row 1
0a'a=To explain as an example, the core row 10a consists of a corrugated sheet 11a and a band-like flat plate extending along the longitudinal direction of the corrugated sheet and joined to the corrugated sheet on one side. 7-) 12a.

The corrugated sheet 11a is made of a flexible material and has continuous peaks 13a and troughs 14a'Y. By aligning the valleys and peaks of each core row as shown in FIG. 1, the core material can be bent and bent more easily.

As is clear from FIG. 1, each core row is connected by joining the other side surface of the flat sheet of an adjacent core row to the peak of the corrugated sheet.

As mentioned above, the corrugated notebook is made of a flexible material similar to cardboard paper. Materials for the corrugated sheet include plastic materials, metal foils such as aluminum, wood veneers such as beech wood, composite boards made of lauan wood veneers and kraft paper, or FRP (fiber reinforced plastic) material can be used. 8 if plastic materials are used
A thickness of 0-300μ is desirable.

If a corrugated sheet made of a material such as plastic or FRP that is not easily deformed by humidification is used, the shape of the core material can be maintained during humidification. For this purpose, corrugated paper can be sprayed or impregnated with a resin material such as urethane resin to prevent deformation of the corrugated sheet due to humidification. In order to provide flexibility, in the case of cardboard paper, the basis weight should be approximately 125-200.
It is desirable to set it to g/m2.

When the plate-like sheet is made of gold fleas, approximately 20-
A metal foil with a thickness of 300 microns or a metal plate with a thickness of up to 2 wings depending on the corrugated pinch can be used.

The flat sheet is made of a material that can be deformed by humidification, that is, a paper material such as cardboard. Also,
As a flat sheet, paperboard such as yellow pole or chip paper7
It can also be used. Any material with a basis weight of about 500 P/m2 can be used.

Next, referring to FIG. 2, the core material of the present invention, which is formed from a corrugated sheet of corrugated cardboard paper↓ and a flat sheet of corrugated cardboard paper, as described above, is bent to form a quadratic curved sheet. The state in which it has been formed is shown.

In order to form such a quadratic curved surface, as shown in FIG. As shown in Figure 4, water vapor or mist water B is sprayed from the humidity generator 20 through the core material;
Press the vicinity of both ends of the core material toward the mold material 30 in the direction shown by .

In this way, by applying appropriate humidification and bending loads to the core material, the flat sheets constituting each core row are deformed to allow the corrugated sort to bend, thereby allowing the curved surface of the core material to be processed. It becomes possible. After the curved surface processing, the curved shape of the core material is maintained by removing moisture from the core material using heat, air, both, or natural drying while maintaining the shape.

(5) Effects As is clear from the above description, according to the present invention, a flat sheet is formed using an inexpensive and easily available paper material, and the core material can be easily curved by the simple means of humidification. becomes possible.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the core material 7 of the present invention, FIG. 2 is a perspective view showing the core material in FIG. 1 in a state where the curved surface has been processed, and FIGS.
The figure is a side view illustrating the manufacturing steps of the present invention in which the core material of FIG. 1 is processed into a curved surface to obtain the curved surface-processed core material of FIG. 2. 1: Core material 10a+10b, 10c, 10d+10e, 10f+1
0g+10h: Core row 11a: Corrugated sheet 12a: Flat notebook 13a:
Peak portion 14a: Valley portion 20: Humidity generator 30: Shape material.

Claims (1)

[Claims] (1) Forming a flexible belt-like sheet to have continuous peaks and troughs to obtain a plurality of corrugated sheets, and forming the troughs of each corrugated sheet with a paper material. forming a plurality of core rows by connecting one side of a band-shaped flat sheet that can be deformed by humidification, and configuring each core row on a mountain portion of a corrugated sheet forming each core row; a step of sequentially joining the other sides of the flat sheet to form a core material, and a step of adding humidity to the core material to make the flat sheet deformable and applying a load to the core material to form it into a predetermined shape. A method for manufacturing a core material having a curved surface consisting of.