JPS5938095B2 - Manufacturing method for lightweight plates - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for manufacturing a lightweight board material that has excellent strength when used at high frequencies, using a lightweight paperboard material as a paper core material, and having a sandwich structure in which arbitrary board-like objects are arranged on the outer panel. Regarding.

Conventionally, lightweight board materials with a sandwich structure in which a paper core material is used between outer panels have already been used in a variety of ways.

However, these are nothing more than a sandwich structure in which a paper core material reinforced with synthetic resin is prepared in advance and the outer panel is adhered to it with an adhesive. Therefore, in such conventional techniques, the manufacturing process is long and complicated, resulting in high costs, and there is a strong desire to simplify the manufacturing process. The present invention completely eliminates the drawbacks and problems of the prior art, and its gist is to use a commercially available lightweight paper board as a paper core material, and to form a paper core material and a plate-like material as an outer panel. The aim is to manufacture a lightweight plate material that is lightweight and has excellent strength by simultaneously reinforcing it with a synthetic resin and bonding the two together using high frequency waves. Hereinafter, the present invention having such characteristics will be explained in detail with reference to the accompanying drawings.

FIG. 1 shows an example in which 1+ sheets of cardboard are used as the paper core material.

As the paper core material, in addition to cardboard, honeycomb cores or other commercially available lightweight paper boards can be used. As the corrugated cardboard 1, commonly available ones can be used. However, since the manufacturing process involves impregnating it with synthetic resin, it cannot be used if it has extremely poor water resistance, or if the surface is covered with wax or the like so that liquid cannot penetrate. Corrugated cardboard 1 in the above range
The material is immersed in a liquid synthetic resin, a synthetic resin aqueous solution, or a synthetic resin emulsion, and then pulled up after being impregnated with it. Next, the plate-like material 2 can be selected according to the intended use.

For example, organic or inorganic materials such as veneer veneer, various types of plywood, and asbestos boards can be used. However, when going through the process of impregnating synthetic resin, materials with extremely poor water resistance or materials that do not allow liquid to penetrate from the surface cannot be used. If necessary depending on the use of the final product, the plate-shaped portion 2 serving as the outer panel is immersed in a synthetic resin, a synthetic J resin solution, or a synthetic resin emulsion, impregnated with it, and then pulled up. If this is not necessary, a synthetic resin compound is applied to the surface. A common synthetic resin may be used for the cardboard 1, which is the paper core material, and the plate-like material 2, which is sandwiched on the outside, or different synthetic resins may be used. The range of synthetic resins herein includes all synthetic resins that can strengthen the cardboard 1 or the plate-like material 2 and bond them together. For example, it is possible to use a rubber-based material, which has excellent workability, or other materials, such as phenolic resin, unsaturated polyester, melamine, area resin, etc. After the treatment, the cardboard 1 and the plate-like material 2, which is the outer panel, are as follows:
By stacking them together to form a sandwich structure and applying high frequency power between the flat plate electrodes 3 and 4 from above and below to the extent that they are lightly crimped, the solvent is dried and the synthetic resin is polymerized or gelled, making it lightweight. Obtain a plate. In this case, in order to obtain a plate with a smooth surface, it is sufficient to place it in a high frequency electric field rather than press it. However, care must be taken to adjust the shape of the corrugated board 1 so as not to deform its waveform or other shape during press pressure. Furthermore, in the present invention, as shown in FIG. 2, it is also possible to use sheets of corrugated cardboard as the paper core material, and as shown in FIG. However, they can all be used as a core. The lightweight plywood produced through this process can be made into plywood for building materials, honeycomb core plywood, or alternative products by considering the synthetic resin used, the selection of the plate material 2 that is the outer panel, and the combination of each material.・A wide range of other applications are possible, and by using various molds during pressing, various curved surfaces can be shaped quite freely.

Finally, the conditions and materials used in the manufacturing method of the present invention are as follows:
It is as follows.

The cardboard used was A-sized double-sided cardboard (commercially available), and the veneer veneer used was a standard standard product.

SBR latex (50 parts by weight of product name LX-415A, 50 parts by weight of product name LX-432A) was diluted with water to a solid content of 30 CL as a synthetic resin for impregnating and reinforcing corrugated board.

On the other hand, for the veneer veneer, a urea-based synthetic resin (100 parts by weight of trade name US-202W, 20 parts by weight of thin blade first grade wheat, 16 parts by weight of water, 4 parts by weight of hardening agent) was used as a synthetic resin for corrugated board bonding. The high frequency application conditions are 7
MHz high frequency input 9KW for 12 minutes, press pressure 1K
It was carried out at g/d.

As a result, a composite with excellent strength was obtained which was dried and integrated all at once.

According to the present invention, by using a high-frequency electric field, a lightweight plate having the above-mentioned structure or having excellent strength and having a wide range of uses can be manufactured through an extremely simple manufacturing process.

Further, according to the present manufacturing method, it is possible to integrate the parts with just a light pressure bonding, and the workability is also extremely good.

[Brief explanation of the drawing]

1 to 3 are partial longitudinal sectional views showing embodiments of the present invention. 1...Cardboard, 2...Plate-shaped object, 3,
4... Flat plate electrode.

Claims (1)

[Claims] 1 Apply or impregnate a lightweight paper board with synthetic resin liquid,
Next, the lightweight paper board is brought into contact with at least one side of the lightweight paper board, sandwiched from above and below between flat plate electrodes to the extent that it is lightly pressed, and high frequency power is applied to integrate the lightweight paper board and the board. A manufacturing method for lightweight plates that is characterized by: