JPS5873199A - Radio wave shielding housing - 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 The present invention is a conductive mat, cloth, or net made by laminating one or more layers of flake-like material onto a reinforcing mat, cloth, or net-like material such as glass fiber or polyester fiber. The present invention relates to a radio wave shield casing that is laminated and formed by impregnating or casting with a polymeric material such as plastic or rubber.

Conventionally, molded products of conductive composite polymer materials have been made by blending carbon black, metal powder, etc. with plastic or rubber to create a crosstalk fraction, and by using highly conductive polymer materials to produce heating elements and boxes for preventing static electricity. , connectors, calculator keyboards, etc., but in order to obtain high conductivity in these materials, a large amount of the above-mentioned conductive material must be mixed into the matrix polymer material to maintain strength. The conductivity of the molded product was limited to the order of 1 G'Ω.

If a conductive material with a high temperature of 1 kW is mixed in, the strength of the material will significantly decrease in terms of physical properties, and the range of use as a structural molded product such as a housing will be limited, and it is completely unsuitable as a conductive molded product for the purpose of radio wave shielding. Ta.

The reason for this is that it is very difficult to mix and disperse the conductive compound material into the matrix polymer material, and that it is very difficult to mix and disperse the conductive compound material into the matrix polymer material. This is because the contact between the conductive materials is inevitably reduced, and because there are parts with high electrical resistance, the leakage of radio waves from those parts significantly impairs the radio wave shielding effect, which becomes a problem.

The present invention aims to provide a radio wave shielding casing that eliminates the conventional drawbacks of the d-shielding effect and moisture content.

That is, 41 is a synthetic thread-fibrous material, gold J! 4-type - Textile material or non-metallic type - Metallized wire material mat, cloth, net or flake t-m strong gaso-rut, polyester fiber mat, cloth or net-like material. Laminate more than ot-m, 1
Rasnatsuk, Gomudera's ^ It is a product that attempts to provide a radio wave shield housing that is impregnated or cast with a molecular material. and.

A mat, cloth, or net-like material made of reinforcing glass fiber, polyester fiber, etc. is laminated on the mat, cloth, or net-like material made of the above-mentioned 411Ilc material by applying pressure so as to be electrically connected, and placed in a mold. The radio wave shield housing is manufactured by impregnation or casting using a molding method such as compression molding or injection molding.

The present invention will be explained below with reference to the drawings.

■ in Figure 1 indicates resin materials such as polyethylene, polypropylene, nylon polyester, and Evoki V, or polymeric materials such as natural rubber and synthetic rubber; Indicates a mat, cloth, net, or flake material, and indicates a mat, cloth, or net material such as glass fiber, polyester fiber, etc. of amt*m. Figure 2 shows the case of injection molding, and Figure 1 shows the case of compression molding. That is, in the case of injection molding shown in Figure 2, the laminates of materials ■ and ■ are placed in the upper mold ■ and lower mold ■ of the injection molding machine in advance, and after the molds are closed, they are plasticized in the cylinder of the injection molding machine. The polymer material (2) is injected into the mold cavity and molded.

@ In the case of compression molding as shown in Figure 8, the polymer material of ■ is made into a sheet in advance, and the materials of ■ and ■ are sandwiched therein, and placed between the upper mold ■ and lower mold ■ of the compression molding machine. Pressure heat mold.

Next, an example will be described.

A book laminated with glass fiber mat was inserted into the mold K of an injection molding machine through both sides of a flexible brass wire mesh, the mold was clamped, and nylon resin was injected into the mold to form the housing. . On the other hand, for comparative study, only a flexible brass wire mesh was placed in the mold and clamped, and nylon resin was injected into the mold to form a housing.

The radio wave shielding effect of each of the casings obtained is as follows: #The strength of the grave was measured using an electric field strength meter. In addition, the tensile strength was determined by cutting and cutting the flat surfaces of an electric body made of laminated glass ruts and woven wire mesh, and a case made of only 1ilkN wire mesh. The slow result is 97 in table = 1! This is as shown in Example No.1.

Each gutter is made of conductive material and reinforced with the following example IK.

The results of Examples 2 to 7 are as shown in Table 1 (Example NcLg to 7), in which a composite material housing made of laminated materials was molded to maintain a constant radio wave shielding effect and tensile strength.

Table 1 The above dormitory JPN shows IlΩ〈2According to the present invention, if the casing is formed by laminating a conductive material and a reinforcing fiber material inside and impregnating or casting with a matrix polymer material, the radio wave shielding effect is achieved. It can be confirmed that the strength of the housing has been sufficiently improved. Tied up.

Since no foreign matter such as powder is mixed into the matrix polymer material, there is no deterioration in the physical properties of the matrix polymer material.
! M of reinforcement aim material! Effect Sufficient reinforcing effect was observed in Tonshin Noodle Example No. 9.

Therefore, it can be applied to radio wave shield housings in places where strength is required, and molded products made of conductive composite materials made of i9 plastic and rubber materials have much better moldability than Meiho, even in complex shapes. Since it can be molded into various shapes and is lightweight, the molded product is optimally used as a radio wave shielding case.

In modern industrial society where computerization is progressing, there is a great need to prevent radio noise interference, and the present invention can be said to be an industrially useful invention that should meet the demands of the times.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention. Figure 1 is a cross-sectional view showing the material structure of the present invention, Figure @2 is a cross-sectional view of a mold according to injection moldability, and Figure @8 is a cross-sectional view showing the material structure of the present invention. A cross-sectional view of a mold formed by compression molding is shown. Patent applicant: Taiheiyo Kogyo Co., Ltd.

Claims (1)

[Claims] A conductive carbon-based fibrous material, a metal-based fibrous material, or a mat, cloth, net, or flake made of a non-metallic 1AAI-like material that has been metamorphosed. It is made by laminating one or more layers of reinforcing knots, cloth, or net-like materials such as glass fiber or polyester fibers, impregnated with a monomolecular material such as plastic or rubber, or molded into a round shape. Radio wave shield housing.