JPH05282925A - Flame resisting insulated wire - Google Patents

Abstract

PURPOSE:To provide a flame resisting insulated wire for which the thickness of insulation the weight and the size are reduced. CONSTITUTION:A thin flame resisting layer 2 consisting of a tape mainly composed of glass, is formed on the outer periphery of a conductor 1, which an insulating layer 3 is formed on the outer periphery of the flame resisting layer 2, and an external insulating layer 4 is formed on the outer periphery of the insulating layer 3. The insulating layer 3 is formed of polyolefine composition of thickness of 0.1-0.4mm, while the external insulating layer 4 is formed of aromatic polymer of thickness of 0.05-0.4mm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fireproof insulated wire.

[0002]

2. Description of the Related Art As a conventional electric wire of this type, as shown in FIG. 3, a fire resistant layer 2 is formed on the outer circumference of a conductor 1, and an insulating layer 100 is formed on the outer circumference thereof. The refractory layer 2 is formed by winding a special refractory tape such as glass mica tape around the outer periphery of the conductor 1. The insulating layer 100 is formed by extrusion coating polyethylene on the refractory layer 2. When the conductor 1 has a diameter of 1.35 mm, the refractory layer has a thickness of 0.25 mm, the insulating layer 100 has a thickness of 0.8 mm, and the overall diameter is 3.
It was 45 mm.

[0003]

The insulation thickness of the conventional fireproof insulated wire (total thickness of the fireproof layer 2 and the insulation layer 100) is
The thickness was 1.05 mm, which was thick. In addition, the insulating layer 100
Since is a cross-linked polyethylene, it is a material that is easy to burn even though it satisfies the fire resistance performance standard.

Therefore, according to the present invention, the insulation thickness is reduced,
It is an object of the present invention to provide a fireproof insulated wire having excellent fireproof performance.

[0005]

In order to achieve the above-mentioned object, the present invention forms a thin refractory layer made of a glass-based tape on the outer periphery of a conductor and an insulating layer on the outer periphery of the refractory layer. Then, an outer insulating layer is formed on the outer periphery of the insulating layer, the insulating layer is formed of a polyolefin composition having a thickness of 0.1 to 0.4 mm, and the outer insulating layer has a thickness of 0.05 to 0.4 mm.
It is formed from the aromatic polymer of.

[0006]

According to the present invention, the insulation thickness can be reduced, and the composition of the insulating layer and the outer insulating layer is excellent in fire resistance. Moreover, the outer insulating layer has excellent heat resistance and mechanical properties, and also has excellent resistance to external damage. Further, since there are two layers of insulators, the probability of penetrating all layers of the pinhole is extremely small, and the electrical reliability is improved.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

In the embodiment shown in FIG. 1, tin, nickel,
A fire resistant layer 2 is formed by winding a fire resistant tape containing 50% by weight or more of an inorganic substance such as glass mica tape around the outer periphery of a conductor 1 made of a copper conductor single wire or a copper conductor stranded wire plated with silver or the like. If the diameter of the conductor 1 is 1.35 mm, the thickness of the refractory layer 2 is 0.05 to 0.25 mm. The polyolefin composition has a thickness of 0.1 to 0.
An insulating layer 3 of 4 mm is formed. The polyolefin composition is
20 to 80% by weight of at least one of polyethylene or ethylene / α-olefin copolymer and ethylene / α-olefin / polyene copolymer (α-olefin is C _{3 to} C ₁₀ and polyene is a non-conjugated diene) It may be a cross-linked or non-cross-linked product. Aromatic polymer having a thickness of 0.05 to
An outer insulating layer 4 of 0.4 mm is formed. Here, the aromatic polymer means aromatic polyamide, polyether ketone, polyether ether ketone, polybutylene terephthalate, polyphenylene sulfide, polyethylene terephthalate, polyphenylene oxide, polycarbonate, polysulfone, polyether sulfone, polyetherimide, polyarylate. , One or two or more blends selected from polyimides or polymer alloys containing these resins as main components, which may be crystalline or amorphous.

Note that another tape layer or layers may be provided between the fire-resistant layer 2 and the insulating layer 3. Due to the presence of these tape layers, excellent electrical characteristics can be secured even if the insulating layer 3 is made thinner. As the tape layer, 0.025 such as polyamide film or polyester film is used.
It is enough to wrap one tape with a thickness of ~ 0.05 mm.

FIG. 2 shows a cable using the fireproof insulated wire of the present invention, in which a sheath 4 is coated on a bundle of two core wire bundles. The sheath 5 is
It is formed from at least one selected from an ethylene acrylic elastomer, an ethylene vinyl acetate copolymer, an ethylene ethyl acrylate copolymer, and a polyethylene styrene ethylene butadiene styrene copolymer as a main component.

Table 1 below shows the respective configurations of various examples and comparative examples.

[0012]

[Table 1]

Table 2 shows the experimental results of fire resistance and flammability of each of the examples and the comparative examples shown in Table 1. In Table 2, ◯ means pass, and x means fail. Moreover, "PEEK" shows polyetheretherketone and "PEI" shows polyetherimide.

[0014]

[Table 2]

The test method of fire resistance performance of Table 2 is that the test electric wire attached to the pearlite plate is attached to a test furnace that has passed the certification test of the Fire and Heat Resistant Electric Wire Certification Operation Committee, and JIS A 1
While heating for 30 minutes to reach the temperature of the flame temperature curve defined in 304, the results of measurements of the insulation resistance before heating, the value of 30 minutes of heating, the results of the withstand voltage test before heating, during heating, and immediately after heating, furnace The measurement results of the burning distances of the cables on the outside of the cable are obtained respectively.

A glass mica tape was used as the refractory layer 2 shown in the table, but any glass-based tape may be used. Conventionally, sufficient fire resistance cannot be obtained without increasing the thickness of the fire-resistant layer, and when the fire-resistant layer is thick, the fuzz of the glass pierces the polyethylene layer, which may cause pinholes, but in the present invention, Even if the thickness of the refractory layer 2 is reduced, sufficient refractory performance can be obtained, and if the refractory layer 2 is thin, the length of fuzz of the glass is short, and the outer insulating layer 4 is not pierced by the glass.

[0017]

As described above, according to the present invention, the insulation thickness can be reduced, and the weight and size can be reduced. In addition, it has excellent heat resistance and mechanical properties, and since it is the outermost layer of a hard aromatic polymer, it is also excellent in scratch resistance. Furthermore, since it has a multi-layer structure, the probability of penetrating all layers of the pinhole is extremely small, and the electrical reliability is improved. Since the fire-resistant layer is formed by the tape mainly composed of glass, even if the glass fibers fluff and stick into the insulating layer, they do not penetrate to the outer insulating layer. Moreover, since the fireproof layer can be made thinner than before, the fluffing of the glass can be shortened.

[Brief description of drawings]

FIG. 1 is a sectional view showing a preferred embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a cable using the fireproof insulated wire of the present invention.

FIG. 3 is a sectional view showing a conventional example.

[Explanation of symbols]

 1 conductor 2 fireproof layer 3 insulating layer 4 outer insulating layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideo Sunazuka 1-5-1, Kiba, Koto-ku, Tokyo Within Fujikura Electric Wire Co., Ltd. (72) Isao Takahashi 1-1-5, Kiba, Koto-ku, Tokyo Fujikura Electric wire company (72) Inventor Masahisa Hasegawa 1-9 Futaba-cho, Numazu-shi, Shizuoka Fujikura Electric Co., Ltd. Numazu factory (72) Inventor Motohisa Murayama 1-5-1, Kiba, Koto-ku, Tokyo Fujikura Electric line stock In the company

Claims (1)

[Claims] 1. A thin refractory layer (2) made of a glass-based tape is formed on the outer periphery of a conductor (1),
An insulating layer (3) is formed on the outer periphery of the refractory layer (2), an outer insulating layer (4) is further formed on the outer periphery of the insulating layer (3), and the insulating layer (3) has a thickness of 0.1 to 0. A fireproof insulated electric wire, characterized in that it is formed of a 4 mm polyolefin composition, and the outer insulating layer (4) is formed of an aromatic polymer having a thickness of 0.05 to 0.4 mm.