JPH05291781A - Covering material for cable - Google Patents

Abstract

PURPOSE:To obtain a covering material for cable which can perform shielding even after wiring is completed. CONSTITUTION:Since a metal layer 4 surrounding a feed-through hole 3 along the direction of an axial line of a cable is formed at a main body 2 made of resin with the feed-through hole 3 where a cable 1 is inserted, electromagnetic wave which is emitted from the cable or outside is attenuated by resistance of the metal layer when passing through the metal layer. When the resin constituting the main body is made of a heat-shrinkable resin, a covering material shrinks by heating after the already laid cable is inserted into the feed-through hole and can be fitted to the cable easily, thus enhancing adhesion strength to the cable. When a slit is formed along the direction of axial line in the main body and the metal layer, the covering material can be fitted without cutting the cable whose wiring is completed, working efficiency can be improved, and working time can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating material for various cables which is used for electromagnetic wave shielding, radiation shielding, sound shielding and the like.

[0002]

2. Description of the Related Art Cables for electronic / electrical products have various types of electromagnetic waves to prevent leakage of electromagnetic waves, radiation, noise, etc. emitted from themselves, or conversely, electromagnetic waves, radiation, noise, etc. emitted from others. A covering material is used. For example, as a material or method for shielding electromagnetic waves, conductive paint, metal (zinc) spraying, vacuum deposition / sputtering / ion plating / metal plating, conductive filler-containing plastics / metal foil, etc. are known. Such a shield treatment was previously applied to the cable and used for wiring.

[0003]

However, depending on the environment in which the cable is used, there is a case where it is desired to increase the degree of shielding after the completion of the wiring than originally planned, and at the beginning, the shielding of electromagnetic waves and the like is required. Is unnecessary,
You may want to add a shield later. In conventional circuit design, it is difficult to completely predict a malfunction of the circuit due to noise such as electromagnetic waves radiated from the wiring or absorbed by the wiring. Conducted and determined the shielding degree of the cable based on the test result. Therefore, regardless of whether there is a sufficient test period and tests can be performed assuming all usage environments, for example, when sufficient test data cannot be obtained, such as for products with a short development period or low-volume products. There was a problem.

In such a case, conventionally, it has been necessary to replace the once-provided wiring with a cable having a desired degree of shielding, which wastes a great deal of working time. In particular, a malfunction of the circuit that occurs after the wiring is completed often occurs when the product is used in an environment that was not originally planned, so it was necessary to modify the product at the installation site. Further, it is also adopted to provide a shielding property by wrapping a metal foil around the cable without replacing the cable, but it is a provisional method and lacks reliability of shielding. In addition, with the recent miniaturization of equipment, the metal foil wrapped around the cable may not fit in the equipment.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a cable covering material capable of easily performing a shielding treatment even after completion of wiring. To do.

[0006]

In order to achieve the above-mentioned object, a cable covering material of the present invention is provided with a resin main body having a through hole into which a cable is inserted, along the axial direction of the cable. It is characterized in that a metal layer surrounding the hole is formed. At this time, the resin forming the main body is
It is preferably a heat-shrinkable resin. Further, it is preferable to form slits in the resin main body and the metal layer along the axial direction thereof.

[0007]

When the existing cable is inserted into the through hole formed in the resin main body, electromagnetic waves, radiation, noise, etc. emitted from the cable are prevented from passing through the metal layer formed in the resin main body. Damped by layer resistance. Also,
Similarly, electromagnetic waves, radiation, noise, etc. emitted from the outside are attenuated by the resistance of the metal layer when passing through the metal layer. This allows the electromagnetic waves of the cable, radiation,
Leakage or influence of noise can be suppressed, and malfunction of electronic and electric products using this cable can be prevented.

If the resin main body is made of a heat-shrinkable resin, the covering material shrinks when the existing cable is inserted into the through hole and then heated, so that not only the work for attaching the cable to the cable is facilitated. Further, the degree of adhesion to the cable is increased, and more excellent shielding property can be imparted. Furthermore, if a slit is formed in the resin main body along the axial direction of the main body, the covering material can be attached without cutting the cable for which wiring has been completed, and the workability is improved,
Working time can be shortened.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a cable covering material according to an embodiment of the present invention, which is a main body 2 made of a resin material.
The resin main body 2 has a through hole 3 into which the cable 1 is inserted. The synthetic resin forming the main body 2 is not particularly limited as long as it is a general-purpose plastic, but when the main body is formed of a flexible synthetic resin, there is an advantage that the cable insertion work becomes easy.

A metal layer 4 made of metal is formed on the outer peripheral surface of the resin main body 2 according to this embodiment.
The metal used for the metal layer 4 is not particularly limited, but a metal having a high degree of shielding may be selected depending on the object to be shielded (for example, electromagnetic waves, radiation, noise, etc.). In consideration of economy, copper, nickel, cobalt, aluminum and alloys thereof are suitable. In addition, such a metal layer 4
Can be formed by a method such as electroless plating, vapor deposition, sputtering or thermal spraying.

To further embody this embodiment, a resin main body 2 having a through hole 3 with an inner diameter of 8 mm is formed using polystyrene synthesized by a conventional method, and an acceleration voltage of 1 kV is applied to the outer peripheral surface of the resin main body 2. Then, sputtering is performed at a sputtering current of 4 A and a vacuum degree of 10 ⁻⁵ torr to form a nickel layer (metal layer) 4 having a film thickness of about 0.4 μm. It has been confirmed that the coating material thus obtained has a good electromagnetic wave shielding property.

The cable covering material of the present invention is not limited to the above-mentioned embodiments, but can be variously modified. 2 and 3 show a cable covering material according to another embodiment of the present invention. In the cable covering material of the present invention, the shielding metal layer 4 formed on the resin main body 2 is
It can be formed not only on the outer peripheral surface of the main body 2 but also on the inner peripheral surface, that is, on the surface of the through hole 3, and is not limited to the surface such as the outer peripheral surface or the inner peripheral surface.
It can also be formed between layers. The embodiment shown in FIG.
This is a specific example in which the metal layer 4 is formed on the inner peripheral surface of the resin main body 2, that is, the surface of the through hole 3 that directly contacts the cable 1. FIG. 3 shows the metal layer 4 on the interlayers 2a and 2b of the resin main body 2. It is a specific example of forming. In the embodiment shown in FIG. 3,
The materials of the resin main bodies 2a and 2b located on both sides of the metal layer 4 may be the same or different.

An example of the method of manufacturing the cable covering material shown in FIG. 2 is as follows. For example, a resin main body 2 having a through hole 3 with an inner diameter of 6 mm is formed by using polyethylene synthesized by a conventional method, and in the through hole 3, a chromic acid-based pretreatment liquid, a PbCl ₂ -based activation liquid, and Copper-based plating solution Noviganth HC (manufactured by Japan Schering Co., composition is Table 1
(Refer to FIG. 3), and the film thickness is about 0.
A copper plating layer (metal layer) 4 of 3 μm is formed. It has been confirmed that the coating material thus obtained has a good electromagnetic wave shielding property.

On the other hand, to give an example of a method for manufacturing the cable covering material shown in FIG. 3, first, an inner resin main body 2a having a through hole 3 having an inner diameter of 4 mm is formed by using polypropylene synthesized by a conventional method. The inner resin main body 2a is sequentially immersed in a sulfuric acid pretreatment liquid, a PbCl ₂ activation liquid, and a copper plating liquid Noviganth HC (manufactured by Nihon Schering Co., Ltd., see Table 1 for composition) to form an inner main body. A copper plating layer (metal layer) 4 having a film thickness of about 0.6 μm is formed on the outer peripheral surface of 2a. Then, apply a silicone resin on the copper plating layer 4 for about 2
The outer resin main body 2b is formed by covering the outer cover with a thickness of 00 μm. It has been confirmed that the coating material thus obtained also has a good electromagnetic wave shielding property. As described above, in any of the embodiments shown in FIGS. 2 to 3, the same operational effect as that of the embodiment shown in FIG.

[0015]

[Table 1]

Although not shown, the metal layer 4 formed on the resin main body 2 is not limited to one layer and may be two or more layers. In this case, various structures such as an inner peripheral surface and an outer peripheral surface, an inner peripheral surface and an interlayer, or an outer peripheral surface and an interlayer of the resin main body 2 can be adopted. In short, the metal layer 4 of the present invention functions to prevent the electromagnetic waves and the like emitted from the outside from being absorbed by the cable 1 and the electromagnetic waves and the like emitted from the cable 1 to leak to the outside. Therefore, it suffices if these electromagnetic waves and the like can be attenuated when they are located between the cable 1 and the electromagnetic waves and the like.

The cable covering material of the present invention can be further modified. For example, in the cable covering material of the embodiment shown in FIG. 4, the main body 2 is made of a heat-shrinkable resin. Examples of the heat-shrinkable synthetic resin include hard polyvinyl chloride, polypropylene, polyester, polystyrene, polyvinylidene chloride, polyethylene, crosslinked polyethylene, and hydrochloric acid rubber. Even in the embodiment in which the main body 2 is made of a heat-shrinkable resin, the metal layer 4 for shielding electromagnetic waves and the like is formed on the inner peripheral surface of the through hole 3, the outer peripheral surface of the main body 2, or the interlayer of the main body 2. Etc. can be formed in various portions as described above.

The cable covering material of such an embodiment is
In the state where the cable 1 is inserted into the through hole 3 of the resin main body 2 which is formed to be larger than the outer diameter of the cable in advance, FIG.
As shown in (A), since there is a gap between the cable 1 and the through hole 3, the cable insertion work becomes extremely easy.
Then, after inserting the cable, the resin main body 2 is heated to shrink the main body 2 and bring the cable 1 into close contact with the main body. As a result, not only can the electromagnetic wave shielding property be further improved, but, for example, as shown in FIG.
When it is inserted into the cable, there is an advantage that the cables 1 can be tightly bundled.

Further, after wiring the cable, if it is desired to attach the covering material without cutting the cable, a slit 5 should be formed in the resin main body 2 and the metal layer 4 as shown in FIG. Is preferred. That is, when this covering material is attached to the cable, it may be fitted into the cable 1 with the slit 5 opened.

[0020]

As described above, according to the present invention, the metal body surrounding the through hole is formed along the axial direction of the cable in the resin main body having the through hole into which the cable is inserted. Electromagnetic waves, radiation, noise, etc. emitted from the outside or from the outside are attenuated by the resistance of the metal layer when passing through the metal layer formed on the resin main body. This allows the electromagnetic waves of the cable, radiation,
Leakage or influence of noise can be suppressed, and malfunction of electronic and electric products using this cable can be prevented.

Further, if the resin main body is made of a heat-shrinkable resin, not only the work of attaching the cable to the cable can be facilitated, but also the degree of adhesion to the cable can be increased and a further excellent shielding property can be imparted. .. Furthermore, if slits are formed in the resin main body and the metal layer along these axial directions, the covering material can be attached without cutting the cable that has completed wiring, improving workability, The time can be shortened.

[Brief description of drawings]

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

FIG. 2 is a perspective view showing a cable covering material according to another embodiment of the present invention.

FIG. 3 is a perspective view showing a cable covering material according to still another embodiment of the present invention.

FIG. 4 is a perspective view showing a cable covering material according to still another embodiment of the present invention, in which (A) shows a state in which the cable is inserted, and (B) shows a state after heating.

FIG. 5 is a perspective view showing a cable covering material according to still another embodiment of the present invention.

FIG. 6 is a schematic view showing an example of wiring for mounting the cable covering material of the present invention, (A) showing before mounting and (B) showing after mounting.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Cable 2, 2a, 2b ... Resin main body 3 ... Through hole 4 ... Metal layer 5 ... Slit 6 ... Coating material

Claims (3)

[Claims] 1. A covering material for a cable, characterized in that a resin layer having a through hole into which a cable is inserted is formed with a metal layer surrounding the through hole along an axial direction of the cable. 2. The cable covering material according to claim 1, wherein the resin forming the main body is a heat-shrinkable resin. 3. The cable covering material according to claim 1, wherein slits are formed in the main body and the metal layer along the axial direction thereof.