JPH04259296A - Holder for electric wire - Google Patents

Abstract

PURPOSE:To make electric wire holding and electromagnetic wave shielding compatible. CONSTITUTION:The parent of a holder for an electric wire (for example, a cable uniting band) is made to be synthetic resin (for example, nylon) and extremely thin metal coating carbon fibers 10 are blended. The metal, coating carbon fibers 10 are such where a metal layer 12 of a thin film consisting of a metal having high magnetic permeability (for example Ni) is formed on the surfaces of carbon fibers. Carbon fibers 11 are generated inside a furnace of 950 to 1300 deg.C by a vapor phase method thermally decomposing benzene while being carbon fibers which are grown having iron powder of a grain diameter 0.02 to 0.03mum as a growth starting part and having a diameter 0.1 to 0.5mum and the length 0.1 to 1mm while having high conductivity. Accordingly, a holder for an electric wire blended with metal coating carbon fibers 10 can realize good electromagnetic wave shielding extending over a wide range due to high conductivity and high magnetic permeability. Moreover, elasticity of synthetic resin can be maintained and high strength can be obtained.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire holder for bundling and/or fixing wires.

0002

[Prior Art] Conventionally, when wiring electronic equipment, etc., cable ties have been used to tie together multiple cables,
Cables were arranged in an orderly manner using wire holders such as clamps to secure the cables to cases, circuit boards, etc. Moreover, a shielding member such as a ring-shaped ferrite core is attached to the wiring of such electronic equipment in order to prevent electromagnetic interference.

0003

[Problems to be Solved by the Invention] However, when holding a cable using such an electric wire holder, the shield member such as a ferrite core may get in the way, and conversely, when the shield member is attached, the electric wire The holder may get in the way, making it time-consuming to put it on. Furthermore, it may not be possible to hold the cable at a predetermined position, or it may not be possible to shield electromagnetic waves at an optimal position. Furthermore, since both the wire holder and the shield member are attached, the wiring inside the device becomes complicated.

The purpose of the electric wire holder of the present invention is to solve the above-mentioned problems and achieve both electric wire holding and electromagnetic wave shielding.

[0005]

[Means and effects for solving the problems] The electric wire holder of the present invention is an electric wire holder for bundling and/or fixing electric wires, which is produced by a vapor phase method using thermal decomposition of hydrocarbons, and has a high melting point. The gist is that a metal layer is formed on the surface of carbon fiber grown using an ultrafine powder of a metal and/or a compound of the metal as a growth starting part, and the metal layer is formed using a resin blended with the carbon fiber that formed the metal layer. do.

The electric wire holder of the present invention having the above structure is used for bundling and fixing electric wires, and is made of a resin blended with carbon fiber and having a metal layer on the surface. Ru. Unlike polyacrylonitrile-based carbon fibers or pitch-based carbon fibers, this carbon fiber is produced in the form of a whisker with a minute diameter approximately equal to the diameter of ultrafine powder of a high melting point metal and/or its compound. Furthermore, it has excellent conductivity and the property of absorbing radio waves.

In order to shield electromagnetic waves, in addition to high conductivity, other properties such as high magnetic permeability are desired. Therefore, in the present invention,
By forming a desired metal layer on the surface of the above-mentioned highly conductive carbon fiber, magnetic shielding can be performed depending on the usage conditions. For example, if emphasis is placed on magnetic shielding, Ni or silicon iron having high magnetic permeability may be used for the metal layer.

[0008] Furthermore, the carbon fibers forming the metal layer used in the present invention are distributed throughout the resin and are dispersed and held in a chain, thereby imparting uniform electromagnetic wave shielding ability to the electric wire holder.

Generally, electric wire holders utilize the elasticity of resin to bind cables, and are required to have good elastic recovery and strength. A conductive wire holder can hold the wire and ground the wire at the same time, and is very easy to use. However, if a wire holder made of a resin containing a metal filler is to obtain the conductivity required for a shield, it will not be practical in terms of strength and elastic recovery.

On the other hand, the above-mentioned carbon fiber used in the present invention has excellent mechanical properties such as tensile strength, which is a property unique to carbon fiber, due to its regular graphite crystal layer. The strength of the resin is improved. Furthermore, since the fibers flex against compression in the longitudinal direction, the elasticity of the resin is maintained.

[0011] Therefore, since the electric wire holder of the present invention is made of a resin blended with carbon fibers having such a metal layer formed thereon, it is possible to achieve both electric wire holding and electromagnetic wave shielding. The high melting point metal used in the present invention is a metal that does not vaporize at 950 to 1300°C, which is the temperature for thermal decomposition of hydrocarbons, and includes metals from group 4a of the periodic table such as Ti and Zr;
Group 5a such as V, Nb, Group 6a such as Cr, Mo, Mn
Group 7a elements such as Fe and Co, and Group 8 elements such as Fe and Co are suitable, and particularly preferred are Fe, Co, Ni, V, Nb, Ta, and T.
i, Zr. Compounds of such metals include their oxides, nitrides, and other salts.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to further clarify the structure and operation of the present invention described above, preferred embodiments of the electric wire holder of the present invention will be described below.

FIG. 1 shows a cable binding band 1 (hereinafter referred to as
(simply referred to as cable tie 1). The cable binding band 1 consists of a head part 2 and a band-shaped band part 3, and binds the cable C by wrapping the band part 3 around the cable C, inserting it into the insertion hole 4 of the head part 2, and pulling it in the direction of the arrow. It is. This cable tie 1 is made of synthetic resin (nylon in this example) as a base material, and is made of very thin metal-coated carbon fiber 1.
0 (Fig. 2) and is integrally formed.

As shown in FIG. 2, the metal-coated carbon fiber 10 has a thin metal layer 12 made of a metal with high magnetic permeability (Ni in this embodiment) on the surface of the carbon fiber 11, which will be described later.
was formed. Note that the thickness of this metal layer 12 is
For example, it is 0.5 to 3.0 μm.

[0015] The carbon fiber 11 is produced by a gas phase method in which benzene is thermally decomposed in a furnace at 950 to 1300°C.
and a diameter of 0.1 to 0.5 μm and a length of 0.1 to 0.1 μm grown using iron powder with a particle size of 0.02 to 0.03 μm as a growth starting part.
It is 1mm carbon fiber. It also has the following physical properties.

Tensile strength: 200 kg/mm 2 Modulus of elasticity: 20 t/mm 2 Volume resistivity: 0.001 Ω·cm The metal-coated carbon fiber 10 is made by forming a metal layer 12 made of Ni on the surface of the carbon fiber 11. It is formed using well-known vacuum deposition, electrolytic plating, electroless plating, painting, etc.

The binding band 1 is made by mixing metal-coated carbon fiber 10 with a synthetic resin material, dry-blending it with a mixer, kneading it with an extruder to create pellets, and forming it into a predetermined shape by injection molding or the like. Ru. At this time, the metal-coated carbon fibers 10 spread throughout the synthetic resin and are dispersed and held in a chain.

The composition ratio of the cable tie 1 of this embodiment is as follows:
Nylon as a base material was 65% by volume, and metal-coated carbon fiber 10 was 35% by volume. Further, in this case, the volume resistivity of the binding band 1 was as low as 0.05 Ω·cm, and moreover, it was uniform.

The binding band 1 thus formed has the following effects. The binding band 1 is made of a shielding material in which metal-coated carbon fibers 10 plated with Ni, which have high magnetic permeability, are blended with synthetic resin, and therefore have high conductivity and high magnetic permeability. Therefore, good electromagnetic wave shielding can be achieved over a wide range due to high conductivity against electric fields and electromagnetic induction, and high permeability against magnetism.

As a result, at the same time as the cables C are bundled, the bundled portion can be effectively shielded from electromagnetic waves, and there is no need to attach a shielding member in parallel as in the conventional case. Therefore, wiring work for electronic devices and the like becomes extremely easy. Moreover, the space required for mounting the shield member is not required, and the cables can be routed in an orderly manner.

[0021] Furthermore, it is lighter in weight than a shielding material made of a synthetic resin mixed with a conductive filler such as metal powder. Furthermore, high strength can be obtained due to the action of the carbon fibers 11 contained in the synthetic resin that is the base material. Furthermore, carbon fiber 11
Because it bends when compression is applied in the length direction of the fiber,
The elasticity of the synthetic resin itself is maintained, and the bundling of the cable C is not adversely affected.

Although the embodiments of the present invention have been described above,
The present invention is not limited to these embodiments in any way, and a clamp or the like may be used in place of the binding band, or a cylindrical core shape may be used. Of course, it can be implemented in other ways.

Furthermore, the type of metal layer can be changed depending on the environment (state of electromagnetic waves) in which the electric wire holder is used. For example, using a silicon-iron alloy, an amorphous alloy, or the like instead of Ni for the metal layer is also effective in magnetic shielding.

[0024]

[Effects of the Invention] As described in detail above, according to the electric wire holder of the present invention, it is possible to bundle electric wires and at the same time effectively shield the bundled portion from electromagnetic waves, and it is possible to shield the bundled portion from electromagnetic waves, unlike conventional shielding members. There is no need to put it on. Therefore, the wiring work for shielding electromagnetic waves from electronic devices and the like becomes extremely easy and the wiring becomes orderly.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a cable binding band according to an embodiment of the present invention.

FIG. 2 is a cutaway perspective view of metal-coated carbon fiber.

[Explanation of symbols]

1... Cable binding band, 10... Metal coated carbon fiber, 11... Carbon fiber, 12... Metal layer

Claims (1)

[Claims] Claim 1: An electric wire holder for bundling and/or fixing electric wires, which is produced by a gas phase method using thermal decomposition of hydrocarbons and starts growing ultrafine powder of a high melting point metal and/or a compound of the metal. 1. An electric wire holder, characterized in that a metal layer is formed on the surface of carbon fibers grown as a part, and is made of a resin blended with the carbon fibers on which the metal layer is formed.