JP2001076546A - Flat cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the handling property and sheath peeling property of a flat cable and to reduce the burden of a cable execution worker by applying flexibility to the cable, and making the cable easy to bend and twist in handling it. SOLUTION: Two insulated wire cores 4 each covered with an insulator (e.g. a vinyl resin) 3 on a conductor 2 are aligned, and two insulated wire cores 4 are covered with a sheath 5 as the basic structure of this flat cable 10. As for the difference between this flat cable 10 in this example and a conventional flat cable, the sheath 5 is filled between the insulated wire cores 4 so that no gap exists in the sheath 5 of the conventional flat cable by the sheath material, whereas an inner sheath 6 is filled in void sections formed by an ellipse inscribed to the parallel insulated wire cores, and the outer sheath 5 is provided on the circumference in this flat cable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat cable such as a VVF (vinyl insulated vinyl sheath cable) or the like, and more particularly to a flat cable which facilitates handling of the cable and facilitates stripping of the sheath to reduce the burden on the cable installer. About the cable.

[0002]

2. Description of the Related Art Flat-type cables are generally used for wiring at entrances from the first support point of a house to an integrating wattmeter and for indoor wiring because of easy handling, excellent weather resistance and heat resistance. Have been. As shown in FIG. 2, the flat cable 1 has an insulator (vinyl resin) 3 on a conductor 2.
Insulated wire cores 4 coated with a wire are arranged, and a sheath 5 is further coated thereon. In such a flat cable 1, two insulated wire cores 4 are arranged side by side, and a sheath 5 is extrusion-coated by an extrusion molding die.

[0003] The flat cable 1 manufactured in this manner.
Is used by the electrician when used for the entrance wiring from the first support point of the house to the integrating wattmeter or for the trunk line connected to the breaker that is branched from the integrating wattmeter to each wiring block by the switchboard. Terminal processing is performed by connecting or connecting an outlet. In performing the terminal treatment, it is necessary to peel off the sheath 5 of the flat cable 1, remove the sheath 5, and expose the two insulated wires 4. The two insulated wires 4 are exposed by cutting a knife such as a cutter knife between the two insulated wires 4 so as to separate the two insulated wires 4, and cutting the sheath 5 in the longitudinal direction of the cable. The sheath 5 is peeled off after that.

[0004]

However, since such a conventional flat cable 1 is formed in a state where the space between the insulated wires is filled with the sheath 5 (sheath filling rate is 100%), There is a problem that the inside of the sheath 5 of the flat cable 1 is filled with the sheath material, so that it is difficult to bend and twist when handling the flat cable 1.

Furthermore, such a conventional flat cable 1
In the case of performing the terminal treatment, it is necessary to peel off the sheath 5 and peel off the insulator 3 of the insulated wire core 4. When the sheath 5 is peeled, the sheath 5 is cut using a cutter such as a cutter knife, and the sheath 5 is cut. Since the surface is large, there is a problem that the sheath cannot be easily peeled off and the workability is poor.

Further, in such a conventional flat cable 1, it is necessary to peel off the sheath 5 and peel off the insulator 3 of the insulated wire core 4 when performing the terminal treatment. This sheath 5
When the sheath 5 is peeled, a cut must be made in the sheath 5 using a blade such as a cutter knife. When making a cut in the sheath 5, the insulator 3 of the insulated wire core 4 is cut with a blade of a cutter such as a cutter knife. There is a problem that the conductor 2 may be damaged, the insulation of the terminal portion may be reduced, or the conductor 2 may be damaged in severe cases.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a flat cable with flexibility so that when the flat cable is handled, the cable can be easily bent and twisted to improve the handleability of the cable and to improve the peelability of the sheath. The aim is to reduce the burden on the installer.

In order to achieve the above object, the flat cable according to the first aspect of the present invention has a conductor in which insulated wires with an insulator coated on a conductor are arranged in parallel, and the sheath is collectively covered with the core. In this flat cable, an inner sheath is filled in a void formed by an ellipse inscribing the entire core of the parallel insulated wires, and an outer sheath is provided around the inner sheath. With this configuration, according to the first aspect of the invention, the flat cable is provided with flexibility, and when the flat cable is handled, the cable is easily bent and twisted to improve the handleability of the cable. In addition, the sheath peelability can be improved and the burden on the cable installer can be reduced.

[0008] In order to achieve the above object, a second aspect of the present invention is provided.
Has an inner sheath formed of a vinyl chloride paste resin composition. With this configuration, according to the second aspect of the present invention, the flat cable is provided with flexibility, and when the flat cable is handled, the cable is easily bent and twisted to improve the handleability of the cable. In addition, the sheath peelability can be improved and the burden on the cable installer can be reduced.

[0009] To achieve the above object, the present invention provides a third aspect of the present invention.
In the flat cable described in (1), the outer sheath is made of a vinyl chloride resin composition. With this configuration, according to the third aspect of the present invention, the flat cable has flexibility, and when handling the flat cable,
The cable can be easily bent and twisted to improve the handleability of the cable, and at the same time, to improve the sheath peelability and reduce the burden on the cable installer.

[0010] In order to achieve the above object, the present invention relates to claim 4 of the present application.
In the flat cable according to the above, the inner sheath is made of 20 to 50 parts by weight of a plasticizer, 0 to 10 parts by weight of a thixotropy-imparting agent, 0 to 10 parts by weight of a gelling agent, 100 parts by weight of vinyl chloride paste resin, and foaming. 0 to 2 parts by weight of an agent and 1 part by weight of a stabilizer. The vinyl chloride paste is, specifically, Zeon 135J. In addition, phthalic acid ester is used as a plasticizer, Ba-based or Zn-based is used as a stabilizer,
Ca-based and ESBO are used. Further, SiO ₂ is used as a thixotropy-imparting agent, epoxy resin and triethylenetetramine are used as a gelling accelerator, and A is used as a foaming agent.
DCA, sodium bicarbonate and ammonium bicarbonate are used. The thixotropy-imparting agent is an additive used to further increase the viscosity of vinyl chloride paste, which is a relatively high-viscosity liquid.The addition of this thixotropy-imparting agent prevents dripping while maintaining high fluidity. In addition, handleability can be improved. The vinyl chloride paste to which the thixotropic agent is added is
When the space between the insulated wire core and the sheath of VF (vinyl insulated vinyl sheath cable) (a void formed by an oval inscribed in the entire wire core of the insulated wire core in parallel),
When filled without dripping and flowing like a liquid, the shape is maintained as it is, and it is gelled by the heat of molding or the heat of the sheath material and molded as a vinyl chloride resin. With this configuration, according to the fourth aspect of the present invention, the flat cable has flexibility, and when the flat cable is handled, the cable is easily bent and twisted to improve the handleability of the cable. In addition, the sheath peelability is improved, and the burden on the cable installer can be reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a flat cable according to the present invention will be described below in detail with reference to FIG.

The basic structure of the flat cable according to the present embodiment is the same as that of the conventional flat cable 1 shown in FIG. That is, as shown in FIG. 1, the flat cable 10 has two insulated wires 4 formed by coating an insulator (for example, vinyl resin) 3 on a conductor 2. The basic configuration is a structure in which a sheath is coated on the insulated wire core 4. The flat cable 10 according to the present embodiment is different from the conventional flat cable 1 shown in FIG. 2 in that the conventional flat cable 1 has a sheath 5 enriched between the insulated wires 4 and a flat cable. While the sheath 5 of the cable 1 is formed without any gap by the sheath material, the inner sheath 6 is filled in a gap formed by an oval inscribed in the entire core of the parallel insulated core. In addition, the outer sheath 5 is provided around it.

The flat cable 10 to be used in the present embodiment is a cable having a flat structure such as VVF (vinyl insulated vinyl sheath cable) and CVF (crosslinked polyethylene insulated vinyl sheath cable).

The flat cable 10 according to the present embodiment is manufactured in the same manner as the conventional flat cable 1 shown in FIG. 2, that is, an insulator (for example, vinyl resin) 3 is placed on the conductor 2. Two coated insulated wires 4 are arranged, and an inner sheath 6 is extruded to cover and fill a gap formed by an oval inscribed in each of the parallel insulated wires, and is extruded thereon. It is manufactured by extruding and coating the outer sheath 5 with a mold. The outer sheath 5 is made of a vinyl chloride resin composition, like the sheath of the conventional flat cable 1.

The inner sheath 6 is composed of 20 to 50 parts by weight of a plasticizer, 0 to 10 parts by weight of a thixotropy-imparting agent, 0 to 10 parts by weight of a gelling agent, and 0 parts by weight of a foaming agent based on 100 parts by weight of a vinyl chloride paste resin. ~ 2 parts by weight and 1 part by weight of a stabilizer. Table 1 shows a composition example of the inner sheath 6.

[0016]

[Table 1] In Table 1, the vinyl chloride paste is specifically Zeon 1
35J. In addition, phthalic acid esters are used as plasticizers, and Ba-based, Zn-based, Ca-based, and ESBO are used as stabilizers. Furthermore, the thixotropic agent is SiO ₂
However, an epoxy resin and triethylenetetramine are used as a gelling accelerator, and ADCA, sodium hydrogencarbonate, and ammonium hydrogencarbonate are used as foaming agents.

Flat cable 1 having two insulated wires 4
Assuming that VVF (vinyl insulated vinyl sheath cable) is 0, a vinyl chloride resin composition is used for the outer sheath 5 as shown in Table 1.
The results of measuring the sheath tear load and the sheath bending load of each of the flat cables 10 using the blending examples of the inner sheath 6 shown in FIG. 2 are compared with those of the conventional flat cable 1 as shown in FIG. It is shown in Table 2.

Table 2 shows the bending characteristics and the peeling characteristics of the flat cable 10 using the mixing examples (A to D) of the inner sheath 6 shown in Table 1.

[0019]

[Table 2] In Table 2, the sheath tear load is obtained by cutting a tool such as a cutter knife between the two insulated wires 4 so as to separate the two insulated wires 4 of the flat cable 10, and cutting the outer sheath 5. Then, both ends of the cut outer sheath 5 were pulled right and left, and the load (N) when the outer sheath 5 was torn was measured.

In Table 2, the cable bending load is the maximum load required to bend the flat cable 10 by a predetermined length, and the measurement was performed in the following manner. That is, first, the flat cable 10 is taken to have a length of 150 mm,
The 50 mm flat cable 10 is supported at a position 25 mm from both ends, and the center position of the 100 mm long flat cable 10 between the supporting positions is pressurized from above and the maximum load (N) applied when bending 50 mm downward. The value was measured, and this value was used as the cable bending load. Looking at the measurement results of VVF (vinyl insulated vinyl sheath cable) from Table 2, the sheath tearing load was 51 N in the conventional example, whereas the sheath tearing load was in Example 1.
(Inner sheath A) is 34N, Example 2 (Inner sheath B)
33N, Example 3 (inner sheath C) is 30N, and Example 4 (inner sheath D) is 29N, which is much lower than the conventional example, and the force required for peeling the sheath is reduced. You can see that. Regarding the cable bending load, the conventional example is 6.8 N, whereas the example 1 (inner sheath A) is 6.6 N, the example 2 (inner sheath B) is 6.6 N, and the example 3 ( The inner sheath C) is 6.4N, and the embodiment 4 (inner sheath D) is 6.3N, which is lower than the conventional example. When the flat cable 10 is bent or twisted, bending (or It can be seen that the load required for twisting is reduced.

As described above, in all of the first to fourth embodiments, the gap between the insulated wire core 4 of the flat cable 10 and the outer sheath 5 is formed of the extremely flexible vinyl chloride paste resin composition of the inner sheath 6. When the flat cable 10 is bent or twisted, the inner sheath 6 filled in the gap between the insulated core 4 and the outer sheath 5 hinders the movement of the insulated core 4. It is easy to move without causing sheath sheath tearing load and cable bending load.

Although FIG. 1 shows a two-core cable as an example, two or more cores (three cores, four cores,
The same applies to the case of a flat cable.

[0023]

Since the present invention is configured as described above, it has the following effects.

According to the first aspect of the present invention, the flat cable is provided with flexibility, and when the flat cable is handled, the cable is easily bent and twisted to improve the handleability of the cable and to remove the sheath. It is possible to improve the performance and reduce the burden on the cable installer.

According to the second aspect of the present invention, the flat cable is made flexible, and when the flat cable is handled, the cable is easily bent and twisted to improve the handleability of the cable and to improve the sheath peeling property. And the burden on the cable installer can be reduced.

According to the third aspect of the present invention, the flat cable is provided with flexibility, and when the flat cable is handled, the cable is easily bent and twisted, so that the handleability of the cable is improved and the sheath peeling property is improved. And the burden on the cable installer can be reduced.

According to the fourth aspect of the present invention, the flat cable is provided with flexibility, and when the flat cable is handled, the cable is easily bent and twisted, so that the handleability of the cable is improved and the sheath peeling property is improved. And the burden on the cable installer can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a flat cable according to the present invention.

FIG. 2 is a sectional view showing a conventional flat cable.

[Explanation of symbols]

 2 ……………… Conductor 3 …………………… Insulator 4 ………………………………………… Insulated wire core 5 ……………………………………………………………………………………… Inner sheath 10 ……………… Flat cable

Claims (4)

[Claims] 1. A flat cable in which a conductor is covered with an insulated wire in which an insulator is covered in parallel and the sheath is collectively covered with the conductor. A flat cable characterized in that an inner sheath is filled in a void portion and an outer sheath is provided around the inner sheath. 2. The flat cable according to claim 1, wherein the inner sheath is made of a vinyl chloride paste resin composition. 3. The flat cable according to claim 1, wherein the outer sheath is made of a vinyl chloride resin composition. 4. The inner sheath according to claim 1, wherein the plasticizer is 20 to 50 parts by weight, the thixotropy-imparting agent is 0 to 10 parts by weight, the gelling agent is 0 to 10 parts by weight, based on 100 parts by weight of the vinyl chloride paste resin. 4. A composition comprising 0 to 2 parts by weight of a foaming agent and 1 part by weight of a stabilizer.
Flat cable as described in.