JPS60225499A - Electromagnetic wave shielding structure - 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 Field of Industrial Application The present invention relates to a structure having excellent electromagnetic shielding properties,
In particular, the present invention relates to structures suitable as materials for work clothes, curtains, equipment covers, etc., used in workplaces that utilize high-frequency electromagnetic waves and indoors where electronic equipment is used.

BACKGROUND OF THE INVENTION Now that electronic devices have become widespread, the problem of electromagnetic interference has come into sharp focus. Electromagnetic interference is a major problem in that it impairs the reliability of equipment, but electromagnetic waves are also known to damage various organs in the human body, so working in areas where electromagnetic waves are generated can also have negative health effects. Can't be ignored.

Therefore, in order to protect the human body from electromagnetic interference, work clothes worn by workers working in areas where electromagnetic waves are generated include work clothes sewn from fabrics woven with metal fibers and fabrics coated with electroless plating. Work clothes are being developed. However, the former type of work clothes lack electromagnetic wave shielding properties to a large extent, while the latter type of work clothes shield electromagnetic waves to some extent, but the shielding effect is not necessarily sufficient and it is not possible to dye, so it is not fashionable. There is a problem that it lacks gender and people do not like the work.

Problems to be Solved by the Invention The present invention has been made to obtain a structure that has high electromagnetic shielding properties and can be applied to clothing materials.

Means for Solving the Problems The electromagnetic shielding structure of the present invention has a basic metal layer (A)
/It is characterized by having a layer structure consisting of a layer (B) of a fiber entangled body containing at least a portion of conductive fibers.

The vapor-deposited metal layer (A) in the present invention refers to a layer formed by a vacuum thin S formation method, that is, vacuum vapor deposition, ion plating, tinging, sintering, etc. Examples of the metal constituting the layer (A) include aluminum, zinc,
Titanium, chromium, iron, cobalt, nickel, copper, molybdenum, rhodium, palladium, silver, indium, tin,
Examples include tankle, platinum, gold, etc., and these are used alone, in alloys, or in the form of mixtures.

A layer of fiber entangled material containing at least a portion of conductive fibers (
B) refers to nonwoven fabrics, woven fabrics, silk fabrics, etc. formed from fibers containing at least a portion, for example 1 to 100%, particularly 10 to 100%, of conductive fibers as described below.
In particular, nonwoven fabrics are highly practical. Examples of the conductive fibers include metal fibers, carbon fibers, aluminum- or carbon-coated glass fibers, metal-based young fibers, and copper adsorption fibers. The layer (B) of the fiber entangled body may be composed of only conductive fibers, but from the viewpoint of cost, ease of manufacture, and performance, it is usually used in combination with other general [1]. . Other common fibers include acrylic fibers, nylon fibers, polyester fibers, urethane fibers, polyolefin TJ & F, polyvinylidene chloride AM, vinyl alcohol fibers, cellulose fibers, redistributed fibers, and natural fibers. , inorganic fibers, etc.

The metal vapor deposited layer (A) is usually provided on a film such as a plastics film or a cellulose film via a release agent previously applied thereon and a protective coating layer formed thereon. The protective coating layer is formed by coating various thermoplastic resins or thermosetting resins including acrylic resin, epoxy resin, and vinyl chloride-vinyl acetate copolymer.

The fiber entangled layer (B) is integrated by adhering onto the metal base layer (A) using a suitable adhesive.

Adhesives used in this case include ordinary solution or dispersion type adhesives that achieve adhesion through the volatilization of volatile matter, as well as adhesive type adhesives and hot adhesives that exhibit adhesive strength when melted by heating. , a tomel-type adhesive (solution or dispersion type, powder type, IIIA cloth type), etc. are used. This adhesive may be a conductive adhesive consisting of a binder and filler (silver, gold, copper, silver, silver-plated copper, silver-plated glass, carbon graphite, etc.). In addition to full-surface adhesion, adhesion may be partial adhesion such as 1-adhesion or linear adhesion, which is preferable because the metal and 4-layer (A) are in direct contact with the fiber entangled layer (B). You can say that. In addition, the fiber entangled layer (
When heat-fusible TA fibers are mixed in B), the fibers act as binder fibers, so the use of the adhesive as described above can be omitted.

A layer of fiber entangled material containing at least a portion of conductive fibers (
A coating layer for fuzzing can be provided on the surface of B) if necessary.

The coating layer of the lever 17 can also be made of a conductive material. Note that the fluffing can also be achieved by heat treatment or mechanical treatment.

In the structure of the present invention having a layer structure consisting of a metal base layer (A)/a layer of fiber entangled body (B), the metal base layer (A)
Further layer (B) of fiber entangled body is laminated on the side (B)/
The layer structure may be as shown in (A)/(B), or another layer may be provided on either or both of the metal base layer (A) side or the layer CB) side of the fiber #1 entangled body. .

1 to 4 are schematic cross-sectional views showing examples of the electromagnetic shielding structure of the present invention, and FIG. 1 shows the metal base layer (A)/
The basic structure consisting of the fiber entangled layer (B) is shown in Figure 2, with a non-woven adhesive made of heat-melting fibers between the metal base layer (A)/fiber entangled layer (B). An adhesive layer (C) is interposed, a protective coating layer (D) is provided on the metal base layer (A) side, and an adhesive layer such as a hot melt adhesive is further provided on the fiber entangled layer (B) side. Structure with (E).

Figure 3 shows a structure in which two sheets of the basic structure shown in Figure 1 are stacked together via adhesive M (C), and Figure 4 shows the metal-based Fit (A) side of the basic structure shown in Figure 1. It has a structure in which a layer (B) of @ fiber entangled body is further laminated.

Effects of the Invention In the structure of the present invention, the base metal layer (present) and the fiber entangled layer (B) containing at least a portion of conductive fibers are in an adjacent positional relationship.

Both of these provide excellent electromagnetic shielding properties, and even if bending or other deformation is applied, the fiber entangled layer (B) will freely follow the bending or deformation, so this basic metal The layer (A) is supported by the layer (B) of the fiber entanglement so that it will not be destroyed, and even if the degree of deformation is large, gaps will be created between the deposited metal particles that make up the deposited metal layer (A) and the layer will not break. Even if they are continuous, the conductive fibers of the layer (B) of the adjacent fiber entanglement will cause the metal particles to contact each other, and as a result, the electromagnetic shielding property will be effectively reduced. is suppressed. Furthermore, the structure of the present invention is thin and flexible, and can be integrated with ordinary fabric by overlapping it with HIM or adhesive.
Therefore, since the fabric can be dyed in any color, it can be made rich in fat.

Possibility of industrial use The thus obtained electromagnetic shielding structure can be used as it is or by attaching or pasting it to various fabrics, films, leather, and other materials for use in workplaces and electronics that utilize high-frequency electromagnetic waves. It is suitably used in various applications that require electromagnetic shielding, such as work clothes, curtains, equipment covers, wrapping materials for magnetic disks, and cord wrapping tapes used in rooms where equipment is used.

Example The present invention will be further explained by giving examples.

In addition, in the following, the electromagnetic wave shielding property was measured by the following measurement method.

Color constant 11 Spectrum analyzer with tracking generator made by Takeda Riken) Frequency range: 10-10-1O00 Reference level 20 or 20 dBi + Display line 20 or 20 d Day shift resolution Bandwidth 2 l K
Hz Video Bandwidth: 300 or 30Hz Sweep Time: 1.
09ec Input attenuator + OdB Example 1 A 4000A thick aluminum adhesion layer (A) was placed on the protective coating layer surface of a 16g thick polyester film coated with a #lI agent and an acrylic resin to protect the adhesive layer. Prepare a material formed by vacuum evaporation method, and apply a non-woven fabric adhesive (C) made of heat-melting fibers to the aluminum adhesion layer (A) surface with a thickness of 8 tiles and a length of 50 cm. 2g/r of 50% stainless steel fiber
A nonwoven fabric (B) of 108/g made of stainless steel fibers and acrylic fibers mixed with n' was laminated and heat-pressed at a temperature of 150°C. With this operation, the aluminum base young calendar (
A laminate was obtained in which the nonwoven* (B) containing stainless steel fibers was integrally adhered to the A) side. Next, the surface of the laminate on which the nonwoven fabric (B) is fixed is coated with a thin aqueous dispersion of an acrylic coating agent and fluffed, and finally the polyester film is peeled off to obtain the desired electromagnetic shielding structure. Product (i) was obtained.

In addition, after coating the surface of the nonwoven fabric (B) fixing side of the laminate after heat-press bonding with a hot-melt adhesive, this is superimposed on a woven fabric made of acrylic-rayon-nylon and heated and pressurized. The polyester film was peeled off and an electromagnetic shielding structure (i
f) was obtained.

Example 2 A 5000A thick aluminum adhesive layer (
Prepare A) formed by vacuum evaporation method, and add stainless steel fiber-nylon type @#-acrylic containing stainless steel fiber of top size and length of 50 mm in an amount of 5 g/m'. 15g/lry made of fibers
The nonwoven fabric (B) of ' was laminated by point adhesion using a powder adhesive of the Holt-melt type, and finally the polyester film was peeled off to obtain the intended electromagnetic shielding structure (IIF).

Further, after coating the surface of this electromagnetic shielding structure (iii) on the side to which the nonwoven fabric (B) is bonded with a hot-melt adhesive, this is superimposed on a cloth made of acrylic fibers and heated and pressurized. The polyester film was then peeled off to obtain a sheet-like electromagnetic shielding structure (ii).

The electromagnetic shielding properties of these structures (i), (ii), (iii) and (ii) were measured. The results are shown in Tables 1 and 2.

Table 1 Measurement of attenuation rate (electric field) Table 2 Measurement of attenuation rate (magnetic field) It can be seen from the above table that the electromagnetic shielding structure of the great invention has extremely excellent electromagnetic shielding properties.

[Brief explanation of the drawing]

1 to 4 are schematic sectional views showing examples of structures of the great invention. (A)...metal vapor deposition layer, CB)...layer of fiber entangled body containing at least a portion of conductive fibers. (C)...adhesive layer, (D)...coating layer, (E)...adhesive layer patent criminal Oike Kogyo Co., Ltd. Figure 1Δ Figure 2 Figure 3 Date Figure 4

Claims (1)

[Scope of Claims] 1. An electromagnetic wave shielding structure having a layer structure consisting of an M-plated metal layer (A)/a layer of a fiber entangled body containing at least a portion of conductive fibers (B). 2. The structure according to claim 1, wherein the fiber entanglement is a nonwoven fabric, a woven fabric, or a silk fabric. 3. The structure according to claim 1, wherein the fiber entangled body is a nonwoven fabric. 4. The structure according to claim 1, wherein a protective layer is provided on the surface opposite to the laminated surface of the fiber entangled layer (B) of the basic metal layer (A). . 5. Claim 1, characterized in that the M-plated metal layer (A) and the fiber entangled layer (B) containing at least a portion of conductive @fibers are integrated with an adhesive. structure.