JPH0735225Y2 - Ironing resistance CT cable - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a CT cable, and more particularly to an ironing-resistant CT cable having improved ironing resistance.

[Conventional technology]

In a conventional CT cable, for example, as shown in FIG. 2, a plurality of insulated wire cores 1 in which a conductor 1a is coated with an insulator 1b are twisted together, and a gap between the twisted insulated wire cores 1 is filled to form a sheath 3. It is generally covered. Insulated wire core 1 and sheath 3
Are in close contact with each other, but are not integrated and can be easily separated. Therefore, when the terminal treatment is performed, the sheath 3 can be easily peeled off and the work can be easily performed. On the other hand, the CT cable (cabtyre cable) has a strong sheath as its name suggests, and its application is not only for general electric equipment, but also for example, for wiring inside a cable carrier of a large crane. ， It is used even under the severe condition of bending. For this reason, the sheath 3 fills and covers the gap when the insulating cores 1 are twisted together so that the sheath 3 and the insulating cores 1 do not shift when subjected to ironing, bending, or the like.

[Problems to be solved by the device] However, according to the conventional CT cable, since the insulated core and the sheath are only in close contact with each other, the workability of the terminal treatment is excellent, but the cable is squeezed (flexed). And stress applied together) causes expansion and contraction difference between the insulated core and the sheath,
Since the insulated core is twisted, there is a disadvantage that a slight difference in strain between the insulated core and the sheath causes a deviation (peeling) between the insulated core and the sheath. If this deviation occurs locally, there is a problem that bending strain concentrates on that part, causing buckling of the insulated wire core, undulation of the cable, and the like. On the other hand, in order to eliminate the strain difference between the insulated wire core and the sheath, a method of integrating the insulated wire core and the sheath may be considered, but in this case, it is difficult to separate the insulated wire core and the sheath at the time of terminal treatment, and workability is reduced. It has not been applied in practice because it deteriorates and the flexibility of the cable is impaired.

Therefore, an object of the present invention is to provide an ironing-resistant CT cable having improved strength against ironing without lowering workability of terminal processing.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention reduces the expansion difference between the insulating core and the sheath by integrally integrating the insulating core and the sheath with an adhesive layer, and greatly improves the ironing resistance. It is a thing. Further, the predetermined tensile strength and tear strength of the adhesive layer, for example, it is necessary to be weaker than the tensile strength and tear strength of the insulating core material and the sheath material, and the elongation to 100% or more. It is desirable to do. Here, it is a matter of course that the adhesive layer is made of a material that exhibits a predetermined viscosity with respect to both the insulating core and the sheath. For example, as the insulating core, EP rubber, natural rubber,
When butyl rubber or the like is used and chloroprene or hypalon is used for the sheath, natural rubber, butyl rubber, or EP rubber can be used for the adhesive layer.

〔Example〕

FIG. 1 shows an embodiment of an ironing resistant CT cable according to the present invention, in which an intervening adhesive layer 2 is extrusion-coated on an insulating wire core 1 composed of a conductor 1a and an insulator 1b, and the insulated wire core 1 is covered. A sheath 3 is put on the twisted strands to manufacture an ironing resistant CT cable. The intervening adhesive layer 2 is composed of the insulator 1b of the insulated wire core 1, and
It is integrated with both of the sheaths 3 and exhibits sufficient viscosity. At the same time, it has a lower tensile strength and tear strength than the insulator and sheath materials, and has an elongation of 100% or more. When ironing was applied to the ironing-resistant CT cable manufactured in this manner, since the insulating core 1 and the sheath 3 were adhesively integrated by the intervening adhesive layer 2, peeling due to the difference in strain did not occur. Also,
Regarding the terminal peeling, which was a drawback when the insulated wire core 1 and the sheath 3 were integrated, the intervening adhesive layer 2 was used when the sheath 3 was peeled off.
Was torn between the sheath 3 and the insulating core 1, so that the sheath 3 and the insulating core 1 could be easily separated without any damage.

[Effect of device]

As described above, the ironing-resistant CT cable of the present invention has a tensile strength and tear strength weaker than that of the insulator and sheath of the insulating core, and has an elongation of 100% or more on the outer periphery of the insulating core. Since the adhesive layer is provided and the insulating core and the sheath are integrated with each other via the adhesive layer, it is possible to improve the strength against squeezing without lowering the workability of the terminal treatment. More specifically, since the insulating core and the sheath are adhesively integrated by such an adhesive layer, it is possible to maintain the integrated state without peeling the sheath due to the difference in strain when subjected to ironing. You can
In addition, with respect to terminal peeling, which is a drawback when the insulating core and the sheath are integrated, there is an effect that the adhesive layer can tear between the sheath and the insulating core, so that the sheath can be easily peeled off. .

[Brief description of drawings]

FIG. 1 is a view showing an ironing resistant CT cable according to an embodiment of the present invention. Fig. 2 shows a conventional CT cable. Explanation of code 1 …… Insulated wire core 1a …… Conductor 1b …… Insulator 2 …… Intervening adhesive layer 3 …… Sheath

Claims (1)

[Scope of utility model registration request] 1. A CT cable (cabtire cable) in which a plurality of insulated cores are twisted together and covered with a sheath, wherein an insulator of the insulated core and the sheath are provided on the outer periphery of the insulated core. An ironing-resistant CT that is characterized in that it has an adhesive layer having a tensile strength and tear strength weaker than 100% and an elongation of 100% or more, and that the insulating core and the sheath are integrated via the adhesive layer. cable.