JPH0765635A - Vvf for easy peeling of sheath - Google Patents

Abstract

PURPOSE:To peel a sheath after a notch is provided on the sheath to easily draw out an insulating conductor when the insulating conductor is to be exposed, even when a talc is not uniformly applied between the insulator and the sheath. CONSTITUTION:Insulating conductors 4 for each of which a conductor 2 is covered with an insulator 3 are provided in line, on which the insulator in a VVF consisting of a sheath 5 coated on the insulating conductor, is formed by applying 30-60 parts by weight of plasticizer, 0.5-10 parts by weight of stabilizer, 25-60 parts by weight of filler, and 1-10 parts by weight of silicone oil to 100 parts by weight of polyvinyl chloride. A talc is interposed between the insulating conductor and the sheath.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a VVF, and more particularly to a VVF which is capable of easily peeling a sheath from an insulator and which can improve the peelability between the insulator and the sheath without impairing the function and characteristics of the insulator.

[0002]

2. Description of the Related Art In recent years, excellent synthetic resins have come to be produced at low cost, and in view of ease of molding and good durability, they are used for all kinds of daily sundries such as kitchen utensils. Has arrived. In particular, there is used a thermoplastic resin composition that exhibits plasticity when heated, solidifies when cooled, and exhibits plasticity when reheated. Further, since this thermoplastic resin composition has excellent electrical properties and a small dielectric constant and a small dielectric loss, it is used as an insulator or a sheath for an insulated power cable or the like formed by coating on a conductor or an insulated wire. ing.

As the entrance wiring from the first support point of the house to the integrated wattmeter and indoor wiring, VVF (600V vinyl insulated vinyl sheath cable flat type) is easy to handle and has excellent weather resistance and heat resistance. Commonly used. This VVF has a structure as shown in FIG. That is, the VVF 100 is an insulated conductor 130 in which a conductor 110 is covered with an insulator (vinyl-based resin) 120.
2 are arranged side by side, and the sheath 140 is further covered on this.

The VVF 100 as described above is used when a wiring is provided from a first support point of a house to an integrated wattmeter, or a trunk line connected to a breaker branched from the integrated wattmeter to a wiring block by a switchboard. The terminal processing is performed by branching the connection by an electrician or connecting an outlet. In performing this terminal processing, V
It is necessary to remove the sheath 140 of the VF 100, remove the sheath 140, and expose the two insulated conductors 130. To expose the two insulated conductors 130, generally, a cut is made in the sheath 140 and the sheath 140 is pulled out to peel off the sheath 140.

Conventionally, as shown in FIG. 6, a silicone oil is used as a release agent 150 between the sheath 140 and the insulator 120 of the insulated conductor 130 so that the sheath 140 can be easily removed from the insulated conductor 130. (The most general-purpose oil with a dimethyl siloxane structure, with a viscosity of 50 to 3
00Cs) talc containing magnesium silicate as a main component mixed in 160 (average particle size 9.0 (± 2.0) μm) 1
70 is interposed.

[0006]

As described above, the sheath 14
0 and the insulator 120 of the insulated conductor 130 between the peeling agent 15
Talc 17 mixed with silicone oil 160 as 0
In the case of a structure in which 0 is interposed, in order to make the peelability uniform,
The amount of the release agent 150 (talc 170) to be interposed needs to be constant. This is because there is a portion that does not peel unless the peeling agent 150 (talc 170) is evenly interposed between the sheath 140 and the insulator 120, and a great pulling force is required to pull out the sheath 140. This is because it may not be possible to peel it off.

However, in the conventional VVF 100 constructed by interposing the talc 170 between the sheath 140 and the insulator 120 of the insulated conductor 130 as described above, the insulator 120 of the sheath 140 and the insulated conductor 130 is formed. Silicone oil 1 for interposing talc 170 between
After the talc 170 mixed in 60 is applied, the excess talc 170 mixed in the silicone oil 160 is wiped with a felt, so that the talc 170 interposed between the insulated conductor 130 and the insulator 120 becomes non-uniform, and the peelability is improved. Has a problem that is not constant.

According to the present invention, even if talc is not evenly applied between the insulator and the sheath, when the insulated conductor is exposed, the sheath is peeled off after the slit is provided in the sheath to easily form the insulated conductor. It is an object of the present invention to provide a VVF in which a sheath that can be pulled out is easily peeled off.

[0009]

In order to achieve the above object, in a VVF in which the sheath can be easily peeled off in the present invention, an insulating conductor coated with an insulator is arranged on the conductor, and the sheath is placed on the insulating conductor. The insulation in the VVF formed by coating is added to 100 parts by weight of polyvinyl chloride and a plasticizer 30 to 6
0 parts by weight, stabilizer 0.5 to 10 parts by weight, filler 25 to 6
It is formed by mixing 0 parts by weight and 1 to 10 parts by weight of silicone oil, and talc is interposed between the insulated conductor and the sheath. Examples of the plasticizer in the present invention include phthalic acid plasticizers and polyester plasticizers. Examples of the stabilizer include barium zinc-based stabilizer and antimony-based stabilizer. Furthermore, as a filler,
There are heavy calcium carbonate, etc.

In the present invention, the blending amount of the silicone-based oil is set to 1 part by weight or more because when it is less than 1 part by weight, the amount of the silicone oil bleeding to the surface of the insulator is small and the effect of improving the peeling property cannot be obtained. Is. Further, the reason why the amount of the silicone oil blended is 10 parts by weight or less is
When kneading polyvinyl chloride, a plasticizer, a stabilizer, and a filler constituting an insulator in a screw cylinder, if the silicone oil is blended in an amount of more than 10 parts by weight, the viscosity is lowered and the kneading cannot be performed. Because.

[0011]

Operation: Insulating conductors coated with an insulating material are arranged side by side, and a sheath is coated on the insulating conductors.
60 parts by weight, stabilizer 0.5 to 10 parts by weight, filler 25 to
It is formed by mixing 60 parts by weight and 1 to 10 parts by weight of silicone oil, and talc is interposed between the insulated conductor and the sheath, so that talc is uniformly applied between the insulator and the sheath. Even if it is not, when the insulated conductor is exposed, it is possible to easily pull out the insulated conductor by making a cut in the sheath and then peeling off the sheath.

[0012]

EXAMPLES Examples of the present invention will be described below. FIG. 1 shows a vinyl sheath cable (VVF) according to the present invention.
It is shown.

In the figure, reference numeral 1 is a vinyl sheath cable, specifically, for example, VVF (JIS C 334).
2,600V vinyl insulated vinyl sheath cable flat type). This VVF1 is a cable for low-voltage wiring used for inlet port wiring and indoor wiring. 2 is a conductor,
Reference numeral 3 is an insulator (a vinyl resin such as polyvinyl chloride) coated on the conductor 2 for the purpose of insulation. And
The conductor 2 and the insulator 3 form an insulated conductor 4. Reference numeral 5 denotes a sheath, which is formed by arranging two insulated conductors 4 that cover the insulator 3 side by side. Between the insulator 3 of the insulated conductor 4 and the sheath 5, as shown in FIG.
Is intervening. Like the conventional release agents, this release agent 6 is made of talc (average particle size 9.0 (± 2.0) μm) 7 containing magnesium silicate as a main component and silicone oil (of the most general-purpose dimethylsiloxane structure). It is formed by mixing oil with a viscosity of 50 to 300 Cs) 8. The release agent 6 is interposed between the insulator 3 and the sheath 5.

A specific example of the composition of the insulator 3 constituting the insulated conductor 4 of the vinyl sheath cable (VVF) 1 having such a structure will be described in comparison with a conventional example.

Example 1 100 parts by weight of PVC (polyvinyl chloride having an average degree of polymerization of 1300, the same applies hereinafter) (specifically, manufactured by Mitsui Toatsu Co., Ltd.) was added to a phthalic acid-based plasticizer (specifically, Sekisui Chemical Co., Ltd. DOP) 40 parts by weight, barium zinc stabilizer (specifically, ADEKA ARGUS CORPORATION Wrap 2)
0) 4 parts by weight, heavy calcium carbonate 35 parts by weight, and silicone oil (viscosity 100 Cs) 5 parts by weight were blended.

Conventional Example PVC (polyvinyl chloride having an average degree of polymerization of 1300, the same applies hereinafter) (specifically, manufactured by Mitsui Toatsu Co., Ltd.) to 100 parts by weight of a phthalic acid-based plasticizer (specifically, Sekisui Chemical Co., Ltd. DOP) 40 parts by weight, barium zinc stabilizer (specifically, ADEKA ARGUS CORPORATION Wrap 2)
0) 4 parts by weight and 35 parts by weight of ground calcium carbonate are blended.

VVF was manufactured by using the vinyl chloride resin composition based on these examples and the vinyl chloride resin composition based on the conventional example as insulators, and the VVF was manufactured for each elapsed days. Table 1 shows the comparison results regarding the pulling load.

Table 1 In Table 1, 10 samples of VVF using the vinyl chloride resin composition based on the example and the vinyl chloride resin composition based on the conventional example as insulators were manufactured, respectively, and these samples were subjected to an environment of 40 ° C. Then, the pull-out load was measured for each elapsed number of days after production (immediately after production), 10 days after production, 30 days after production, and 60 days after production.

The pull-out load in Table 1 is measured by fixing only the sheath 5 so that it does not move and pulling out the insulated conductor 4 in the direction indicated by arrow A at a speed of 200 mm / min, as shown in FIG. Then, the insulated conductor 4 is pulled in the direction indicated by the arrow A, and the maximum load (N) from when the insulated conductor 4 starts to be pulled out to when it is completely pulled out is defined as a pulling load,
The smaller the measured value, the better the peelability.

The measurement result of the pulling load in Table 1 is 10
It shows the range of the minimum load and the maximum load of the withdrawal load for each elapsed days of the sample of this book.

From the measurement results of the pulling load in Table 1, the pulling load immediately after the production is 6.9 to 11.8 [N] in the case of the conventional example.
On the other hand, in the case of the embodiment, 4.9 to 6.9 [N].
And the case of the embodiment is much smaller than that of the conventional example. That is, the peelability is improved in the example than in the conventional example.

Looking at the pulling load on the 10th day after the production, it is 6.9 to 12.2 [N] in the case of the conventional example, whereas it is 4.9 to 7.3 [N] in the case of the example. ] And the embodiment is much smaller than the conventional example. That is, the peelability is improved in the example than in the conventional example.

Also, looking at the withdrawal load 30 days after manufacture,
In the case of the conventional example, it is 7.8 to 13.2 [N], whereas in the case of the example, 4.9 to 7.8 [N], which is far more than the conventional example. small. That is, the peelability is improved in the example than in the conventional example.

Further, the pulling load 60 days after production is 8.8 to 14.7 [N] in the case of the conventional example, and 5.4 to 7.8 in the case of the example. The case of [N] and the embodiment are much smaller than those of the conventional example. That is, the peelability is improved in the example than in the conventional example.

As described above, in the present embodiment, the insulated wire core (insulated conductor) can be pulled out by a much smaller pulling load than the conventional example, because the silicone oil (in the insulator 3 of the insulated conductor 4 ( This is because the viscosity of 100 Cs) 9 bleeds from the inside of the insulator 3 to the surface of the insulator 3 as shown by the arrow B in FIG. 4 and acts to improve the peeling property. That is, the silicone oil (viscosity 100 Cs) 9 mixed in the insulator 3 of the insulated conductor 4 bleeds onto the surface of the insulator 3, and the silicone oil 9 bleeds onto the surface of the insulator 3 as shown in FIG. The release agent 6 is formed to have a predetermined thickness, the release agent 6 is formed to a predetermined thickness on the silicone oil 9, the sheath 5 is covered on the release agent 6, and the surface of the insulator 3 is bleed. This is because the silicone oil 9 that acts on the release agent 6 improves the release properties of the release agent 6.

As can be seen from the measurement results of the pulling load, in the case of the conventional example, the pulling load is from 6.9 to 11.8 [N] as time elapses from 0 days after the production (immediately after the production). It gradually increased from 8.8 to 14.7 [N],
It can be seen that the peelability between the sheath and the insulator decreases.
On the other hand, in the case of the example, 0 days after production (immediately after production)
Even after a lapse of time, the pulling load is 4.9 to 6.
It can be seen that there is almost no change from 9 [N] to 5.4 to 7.8 [N], and there is no change in the peeling property between the sheath 5 and the insulator 3.

[0027]

Industrial Applicability According to the present invention, an insulating conductor in which a conductor is coated with an insulating material is arranged, and a sheath is coated on the insulating conductor. 60 parts by weight, stabilizer 0.5 to 10 parts by weight, filler 25 to 60 parts by weight, silicone oil 1 to
It is formed by mixing 10 parts by weight, and talc is interposed between the insulated conductor and the sheath. Therefore, even if talc is not uniformly applied between the insulator and the sheath, When exposed, the insulated conductor can be easily pulled out by making a cut in the sheath and then peeling the sheath.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view showing a boundary surface between an insulator and a sheath of the vinyl sheath cable shown in FIG.

FIG. 3 is a diagram for explaining a measuring method of a pulling load.

FIG. 4 is a diagram for explaining the effect of the present invention.

FIG. 5 is a cross-sectional view of a conventional VVF.

FIG. 6 is a cross-sectional view showing a boundary surface between a conventional VVF insulator and a sheath.

[Explanation of symbols]

1 ……………………………………………………………… Vinyl sheath cable 2 ………………………………………………………… Conductor 3 ……………………………………………………………… Insulator 4 ………………………………………………………… Insulated conductor 5 ……………………………………………………………… Sheath 6 ……………………………………………………… …… Stripping agent 7 ……………………………………………………………… Talc 8 …………………………………………………… ………… Silicone oil 9 ……………………………………………………………… Silicone oil

Claims (1)

[Claims] 1. In a VVF in which an insulating conductor coated with an insulator is arranged on a conductor and a sheath is coated on the insulated conductor, the insulator is added to 100 parts by weight of polyvinyl chloride.
Plasticizer 30-60 parts by weight, stabilizer 0.5-10 parts by weight,
Filler 25-60 parts by weight, silicone oil 1-10
A VVF capable of being easily peeled off, characterized in that it is formed by blending parts by weight and talc is interposed between the insulated conductor and the sheath.