JPH0536313A - Manufacture of low-brightness cable - Google Patents

Abstract

PURPOSE:To manufacture a cable of a low reflection factor with which generation of corona noise is eliminated with a simple facility in a short time by twisting a single aluminum wire or a plurality of aluminum wires solely or with reinforcement wires, and applying heat-treatment thereto in water solution of tertiary amine. CONSTITUTION:By immersing and heat processing an aluminum wire or a plurality of aluminum wires solely or twisted with reinforcement wires in water solution of tertiary amine, a surface of a very low brightness can be provided in a very short time. Even without washing after the process, corrosion of the aluminum wires or the reinforcement wires will not occur, and the safety an economy can be improved. For example, a drum-taken ACSR wire of a cross sectional surface of 610Hz is sent through immersing tanks each containing a water solution of pH9 of a triethanol amine density of 0%, 0.25%, 0.50%, and 0.75% at such a speed to achieve an immersion period of 5min. to be heated, and it is naturally dried. A low-brightness cable of a low reflection factor with which generation of corona noise is reduced can thus be manufactured with a simple facility in a short processing time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a low-brightness electric wire which has low reflection and generates less corona noise.

[0002]

2. Description of the Related Art Conventionally, in an overhead power transmission line that passes through an environmental protection area such as a national park, the surface of the electric wire is matted by shot blasting so as not to spoil the aesthetics of the environment, and the surface is reflected. Low reflection electric wire with a low rate,
Colored electric wires with colored paint applied to the surface of electric wires are used.

Where corona noise is a problem,
The wire is boiled in deionized water or exposed to a steam atmosphere to form a beehmite layer on the surface, so-called A.
N (audible corona) reduced wires are used.

Recently, however, both of these characteristics (low reflection,
In addition to AN reduction), there is a demand for an overhead power transmission line in which the surface of the electric wire is blackened to reduce the brightness.

As a method of reducing the brightness,
(A) After forming an alumite layer on the wire surface by alumite treatment, impregnate this layer with a black dye, pigment, etc. (b) Chemically plate the wire surface with a black metal such as molybdenum or manganese. (C) A method such as applying a black colored paint is known.

[0006]

However, among these methods, the method (a) cannot perform alumite treatment in the case of an electric wire having a steel wire such as ACSR wire (steel core aluminum stranded wire). For this reason, it is necessary to treat at the stage of strands, which requires a large amount of equipment costs such as a large number of equipment and electrolysis equipment, and a treatment time of 30 minutes or more is required if pretreatment and water washing are included. There is a difficulty to do.

In the method (b), it is practically impossible to completely wash away the treatment liquid that has penetrated into the electric wire, and the remaining treatment liquid may corrode the aluminum wire or the steel wire.
In order to prevent this, if processing is performed at the strand stage, problems occur in terms of equipment cost and processing time as in the method (a).

Further, in the method (c), the paint is partially peeled off due to aging, which causes corona generation.

The present invention has been made in view of such conventional circumstances, and a low-brightness electric wire having a low reflectance and a low possibility of generating corona noise can be manufactured with a simple manufacturing facility and in a short processing time. The purpose is to provide a method.

[0010]

The method for producing a low-brightness electric wire according to the present invention comprises an aluminum wire or a stranded wire formed by twisting a plurality of aluminum wires alone or together with a reinforcing wire, in an aqueous solution of a tertiary amine. It is characterized in that it is dipped in and heat-treated.

The aluminum wire in the present invention is not limited to a pure aluminum wire, but may be various aluminum alloy wires generally used as a wire material. Examples of the reinforcing wire include a wire material made of glass fiber reinforced plastic or carbon fiber reinforced plastic in addition to steel wire.

As the aqueous solution of the tertiary amine used in the method of the present invention, an aqueous solution of triethanolamine whose pH is adjusted to 8 to 9 is particularly effective in reducing the brightness in a short time without impairing other characteristics. It is preferable because it can be done. When the pH is less than 8, the effect of low brightness decreases, and when the pH is less than 9,
When it exceeds, the color tone changes from black to green. When an aqueous solution of triethanolamine is used, a triethanolamine concentration of 0.25 to 1% is suitable.

Further, the treatment temperature is preferably in the range of 60 to 90 ° C. If it is less than 60 ° C., the long-term reliability of the low brightness effect is lowered,
On the other hand, if the temperature exceeds 90 ° C, the brightness will increase.

The treatment time depends on the type of treatment liquid used, the treatment temperature, the size and structure of the object to be treated, that is, the thickness of the aluminum wire, whether it is a single wire or a stranded wire,
When treated with an aqueous solution of triethanolamine at a temperature of 60 to 90 ° C., a lightness (Munsell value) of about N 4.5 to 5 can be obtained within 2 to 5 minutes.

[0015]

In the method for producing a low-brightness electric wire of the present invention, an aluminum wire or a stranded wire formed by twisting a plurality of aluminum wires alone or together with a reinforcing wire is immersed in an aqueous solution of a tertiary amine and heated. By the treatment, it is possible to reduce the brightness of the surface in an extremely short time, and there is no fear that the aluminum wire or the reinforcing wire will be corroded even if it is not washed with water after the treatment. It is also advantageous in terms of safety and economy.

[0016]

EXAMPLES Examples and comparative examples of the present invention will be described below.

Cross-sectional area 610mm ² of drum removed ACSR
The lines are drawn with triethanolamine concentrations of 0% and 0.25, respectively.
%, 0.50%, and 0.75% aqueous solutions (pH 9) were placed in the dipping tank at a linear speed so that the dipping time was 5 minutes, and naturally dried to produce a low-brightness electric wire. The immersion liquid temperature is 60 ℃, 70 ℃, 80 ℃ for each solution.
℃, 90 ℃ and 100 ℃.

When the lightness (Munsell value) of the low-lightness electric wire thus obtained was measured, the results shown in the graph of FIG. 1 were obtained.

As can be seen from the figure, the low-brightness electric wire manufactured by the method according to the present invention has a sufficiently low brightness even though the processing time is as short as 5 minutes. Has been.

The surface reflectance of the obtained low-brightness electric wire was measured, and the drainage property showing the effect of reducing corona noise was examined. The low-brightness electric wire according to the present invention was also found to have these characteristics. It had good properties.

[0021]

As is apparent from the above embodiments, according to the method of the present invention, an aluminum wire or a twisted wire formed by twisting a plurality of aluminum wires alone or together with a reinforcing wire is used as a third grade. Since the heat treatment is performed by immersing the wire in an aqueous solution of amine, a low-brightness electric wire with low reflectance and less risk of corona noise can be manufactured in a short processing time with simple equipment. Further, since it can be treated at a low temperature, it is safe and economically advantageous, and it is not necessary to wash it with water after the treatment.

Therefore, when the present invention is applied to a twisted wire type having a steel wire such as an ACSR wire, the brightness can be reduced without any problem even if the treatment is performed not after the stranding but after the twisting. Therefore, unlike the conventional method, there are no problems such as equipment cost and long processing time.

[Brief description of drawings]

FIG. 1 is a graph showing the brightness of low-brightness electric wires obtained in Examples and Comparative Examples of the present invention together with the type of processing liquid used and the processing temperature.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroko Ebiko 2-1 1-1 Oda Sakae, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture In Showa Electric Wire & Cable Co., Ltd. 2-1-1 No. 1 Showa Cable Denki Co., Ltd. (72) Inventor Ichiro Sato 2-1-1 No. 1 Oda Sakae, Kawasaki-ku, Kawasaki-ku, Kanagawa Prefecture 2-1-1 Oda Sakae, Kawasaki-ku Showa Electric Wire & Cable Co., Ltd.

Claims (1)

Claims: 1. An aluminum wire or a stranded wire formed by twisting a plurality of aluminum wires alone or together with a reinforcing wire is immersed in an aqueous solution of a tertiary amine for heat treatment. A method for manufacturing a low-brightness electric wire, which is a feature.