JP2001267787A - Mold plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem where the electromagnetic wave generated at an electronic apparatus induces malfunction of surrounding electronic apparatus, and recently, as with a portable telephone set, use of highly integrated apparatus of high frequency is increased, and it is difficult to take countermeasure against troubles with respect to circuitry. SOLUTION: The problem is solved using a mold plate where mold sheets comprising resin-processed carbon fiber paper and metal mesh are stacked and molded. The one with a decorative sheet laminated on the molds sheet where a decorative paper and the like is resin-processed is used in the same way as a conventional building material. In particular, the one with a phenolic resin used as the mold sheet is very useful as a decorative material and the like with fire resistance and slow-burning characteristics.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cosmetic material having an electromagnetic wave shielding function.
The present invention relates to a molded plate having electromagnetic wave shielding performance capable of shielding electromagnetic waves having a frequency of Hz or higher.

[0002]

2. Description of the Related Art Electromagnetic waves generated by digital electronic devices cause malfunctions of peripheral electronic devices and cause electromagnetic interference. In recent years, the degree of integration of semiconductors has increased,
Radiation noise has shifted to a high frequency region due to the increasing use at signal operating frequencies of 100 MHz or higher, and it has become difficult to achieve a solution only by measures to prevent occurrence on a circuit.

[0003]

Problems that cannot be overlooked medically, such as malfunction of electronic devices, for example, various electronic devices used in the medical field, for example, pacemakers and the like due to electromagnetic waves transmitted from the outside, are urgently solved. It is a task to be done. However, electronic devices such as mobile phones, whose penetration rate is rapidly increasing, are frequently used in the surroundings, and there is a danger that malfunctions will occur constantly. In a public building such as a conference room, a theater, a museum, a movie theater, and the like, communication from the outside to a mobile phone causes annoying surroundings. In view of such a situation, the cosmetic material according to the present invention shields electromagnetic waves transmitted from peripheral electronic devices by using it as a member of a building interior, partition, etc. An object of the present invention is to provide a molded plate capable of preventing malfunction of equipment and avoiding trouble in a public building or the like.

[0004]

Means for Solving the Problems The molded plate of the present invention uses carbon fiber paper (hereinafter referred to as CP) made of carbon fiber (hereinafter referred to as CF) in order to secure electromagnetic wave shielding performance. A molded sheet (hereinafter referred to as SS) impregnated with a resin, for example, a phenol resin, and a metal mesh (hereinafter referred to as MM) or a treated sheet obtained by resin-treating the MM (hereinafter referred to as SYS) alone or as a substrate layer, When used as a substrate layer, a sheet (hereinafter referred to as DS) obtained by impregnating a porous substrate such as paper or decorative paper with a resin such as a melamine resin on the substrate layer is formed by hot pressing. Consisting of

[0005] The CF can be used in any of so-called pan and pitch systems. The fiber diameter of the CF is 4 to 8
A material having a length of 4 μm and a fiber length of 4 μm to 10 mm is used. The C
The volume resistivity as P is 1.5 × 1 at a basis weight of 10 g / m ^2.
0 ⁻³ Ω · cm, and if the basis weight is more than this, a lower volume resistivity can be obtained. In the present invention, a basis weight of the CP of 10 to 150 g / m ² can be used, but if the basis weight is large, the performance can be secured, but the cost is high, so that a suitable basis weight may be selected. In addition, other fibers such as pulp, natural fibers such as hemp, or polyester,
Synthetic fibers such as nylon and vinylon may be mixed CPs in a range that can secure an acceptable volume resistivity.

The MM is made of a metal fiber such as stainless steel, brass, copper, aluminum or the like having a wire diameter of 0.02 to 2.0 mm, and is preferably plain woven and has a woven density of 20 to 300 mesh. 5-20% by weight of the MM with the same resin as the CP if necessary for adhesion to other layers
The degree processed SYS may be used.

Examples of the resin to be impregnated with the CP include phenolic resins, polyester resins, epoxy resins and the like. Among them, phenolic resins are excellent in impregnating properties, have fire resistance, are self-extinguishing, and are flame-retardant. It is preferable from the viewpoint of building materials because it has features such as the presence of a flame barrier effect due to carbonization and the advantage of cost. As the phenol resin, a resol type used for a general melamine resin decorative board is suitable for the impregnation treatment and can be processed in the same line, so that it is suitable. A resin ratio of 40 to 80% by weight is suitable.

The sheet is made of paper or synthetic fiber made of pulp fiber or the like, nonwoven fabric processed from natural fiber, or a porous substrate on which a pattern or the like is printed. For example, a resin processed by impregnation with a melamine resin, a polyester resin, a diallyl phthalate resin or the like is used. The impregnation rate for the substrate is preferably 50 to 100% by weight. In addition, resin-treated or untreated materials such as veneers and ground plates made of natural wood can also be used as decorative sheets.

In the molded plate according to the present invention, the MM is arranged between the CPs, a plurality of the SSs and the MMs or the SYSs are laminated or molded, or the DSs are further laminated thereon and heat is formed. It is molded by pressing.
An overlay formed by impregnating a resin similar to that used for the DS on a thin paper of about g / m ² is formed by overlapping, and the color tone of the resin used for the SS or the CF is hidden on the SS. For this purpose, a method in which a sheet impregnated with a resin or the like used in the DS or the like is disposed on a barrier paper mixed with a material having an opaque property such as titanium oxide, and then formed and finished may be adopted.

When the molded plate of the present invention is used as an interior material, a conductive tape in which a metal foil is coated with an adhesive at a joint portion of the molded plate, or a metal or metal sheet on the surface of a paper or a resin film is adhered to the back surface of the sheet. Glue a conductive tape, etc. coated with an agent, or apply a conductive sealing material to the joint of the molded plate, or use a combination of a conductive tape and a conductive sealing material to bond or glue to the wall base. If it is constructed and grounded, problems such as leakage of the shield from the joint can be avoided.

Next, examples of the present invention will be described together with comparative examples.
Will be described. Example 1 CF having a fiber diameter of 4 to 7 μm and a fiber length of 5 to 7 mm was formed.
Prepared basis weight 50 g / m^Two, Volume resistivity 1.2 × 10^-3
Ω · cm CP contains resol type phenolic resin
Soak and dry to obtain SS with 40% weight ratio of CP to CP
Was. In addition, a wire with a wire diameter of 0.1 mm and a mesh size of 100
50 g / m of the same resin as the CP in Tenres plain weave^TwoAdhesion
The obtained SYS was obtained. On the other hand, tsubo printed on pulp paper
100g / m^TwoImpregnated with melamine resin and dried
Thus, a DS having a decorative paper weight ratio of 60% was obtained. The S
The MM is placed between S, and the DS is placed on the MM.
° C, 40kg / cm ^TwoTo obtain the formed plate of Example 1.
Was.

Example 2 A basis weight of 180 g / SS was used between SS and SYS used in Example 1.
A molded plate was formed in the same manner as in Example 1 except that one kraft paper impregnated with 70% by weight of the phenolic resin used in Example 1 was impregnated into m ² kraft paper.

Comparative Example 1 In Example 1, the basis weight was 180 g /
The same resin as that used in Example 1 was attached to kraft paper of m ^{2 in} an amount of 50% by weight with respect to kraft paper, and four sheets were overlapped.
Then, the same DS as in Example 1 was placed thereon, and the temperature was set to 120 ° C. and 40 ° C.
The molded plate of Comparative Example 1 was molded by applying heat and pressure at kg / cm ² .

Comparative Example 2 A molded plate of Comparative Example 2 was formed in the same manner as in Example 1 except that two SSs used in Example 1 were used.

Tables 1 and 2 show the results obtained by measuring the electric and magnetic field attenuation factors over the frequency of 100 to 1000 MHz for the molded plate of the example, the molded plate of the comparative example, and the copper plate having a thickness of 0.3 mm for reference. It was on the street.

[0016]

[Table 1] Note) Measurement unit Decay rate dB Measurement method Advantage test method (MIL-STD-
285).

[0017]

[Table 2] Note) Measurement unit Decay rate dB Measurement method Advantage test method (MIL-STD-
285).

Using a plate obtained by bonding 9 mm plywood as a reinforcing material to the molded plate and the copper plate of the examples and comparative examples,
A box having a width and a height of 50 cm was prepared. A mobile phone or a PHS was placed inside the box, and the joint of each plate was sealed with copper tape coated with a conductive adhesive. Table 3 shows the results of a communication test on whether communication from an external PHS or mobile phone to an internal mobile phone or PHS was possible.

[0019]

[Table 3] Note) Yes External devices can communicate with internal devices. Not possible Communication from the external device to the internal device is not possible.

[0020]

The molded plate according to the present invention is formed by integrally molding a plurality of resin-treated carbon fiber papers and a base material layer made of a metal mesh. It has shielding performance and can strongly block transmission of electromagnetic waves from outside. In particular, a sheet formed using a decorative paper as a base material has the same appearance as a general decorative material, and can be used as an interior material such as a wall surface or a ceiling as in the past. Therefore, it can play a role as an interior material such as walls, ceilings, etc. in offices, work rooms, measurement rooms where various electronic devices are installed, and medical rooms where various medical devices are installed, and the like.
At the same time, malfunction of these electronic devices installed in these rooms can be prevented.

When used in public buildings such as various conference rooms and halls, external communication can be cut off.
Comfortable use as a public place. In particular, when a phenolic resin is used as the resin for the molded sheet, the phenolic resin has high flame retardancy and fire resistance, so that it has a high utility value as a functional interior material having high fire resistance. Also, since the metal mesh is laminated, the strength is excellent, and it is not broken or broken.

Continued on the front page F term (reference) 2E001 DH01 GA23 GA24 GA25 GA28 GA32 GA42 HB03 HB04 HB05 HC07 HD11 JA29 JC02 JD02 LA04 2E162 CB10 CB16 CB21 CD11 FA20 FB07 FB09 FC01 FC03 FD04 FD06 5E321 AA11 BB21 BB33

Claims (3)

[Claims] 1. A molded plate characterized by being formed by laminating molded sheets made of resin-treated carbon fiber paper and a metal mesh and applying heat and pressure. 2. A sheet obtained by impregnating a resin with a porous base material such as a paper or a non-woven fabric which has been subjected to decorative finishing is laminated and formed on the upper surface layer of the formed sheet. The molded plate as described. 3. The molded plate according to claim 1, wherein a phenolic resin is used for the molded sheet.