JPS6014451B2 - How to make an insulation film on copper wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION BACKGROUND AND OBJECTIVES It has been proposed to create a thin copper oxide coating on the surface of steel cables, for example for strand insulation of power cable conductors.

In this invention, oxidation treatment is performed using an oxidizing gas.

・Example 1 (Figure 1) [1) The copper wire 10 is heated after being degreased.

Note that copper wire includes both solid wire and stranded wire. Heating is carried out in a closed heating chamber 12. 14 is a seal, 1
6 indicates a guide roll.

For example, the copper wire 10 is heated to 150 to 400 qo using a known electrical heating device 18. Other means such as high frequency conductive heating can also be used for heating. Note that the inside of the heating chamber 12 is kept airy with an inert blanket using steam, nitrogen gas, or the like 20.

The copper wire 10 enters the next oxidation stage 22 while maintaining a state in which no oxidized steel is produced on the surface. ■ The oxidizing chamber 22 is filled with oxidizing gas 24 such as ozone, oxygen, and chlorine dioxide.

Further, oxidizing gas is sprayed onto the steel wire 10 using the spray 26 . Even if the copper wire 10' enters the oxidizing tube 22, the temperature does not drop much because it is in contact with gas.

Since the heating temperature at heating step 12 is almost maintained,
The oxidation reaction on the surface of the copper wire 18 progresses rapidly and ends instantaneously. Then, a cupric oxide film having a thickness of about 0.5 to 1 cape is formed. This serves as insulation for the Qin wire. Further, the thickness of the oxide film can be adjusted by controlling the heating temperature of the copper wire 10 and changing the type of oxidizing gas.

'3i Then, the copper wire 10 is passed through the cooling tube 28 and cooled to room temperature.

For the coolant 30', use a low concentration sodium chlorite aqueous solution, hydrogen peroxide aqueous solution, etc. This method is more convenient than simply cooling with water in the following respects. That is,
When rapidly cooled with water, the oxide film peels off due to heat shock. Since the oxidizing aqueous solution has an exothermic reaction, rapid cooling can be prevented and oxidation can be performed simultaneously with cooling. The steel wire that comes out of the cooling tube is passed through the cleaning tube 32 and then wound up.

Example 2 (Figure 2) 34 seems to be thermally oxidized.

In this, the continuously running copper wire 10 is heated to 150 to 400 o0 by, for example, a high frequency induction heating device 19 or the like. The chamber 34 is filled with an oxidizing gas 24 such as ozone or oxygen, and is sprayed with a spray 26. Compared to oxidizing liquids, oxidizing gases are not rapidly cooled and have a much faster reaction rate, so cupric oxide can be produced instantaneously. Thereafter, as in the case of Example 1, the film is cooled down to room temperature through a cooling funnel 28 containing a cooling liquid 30 made of a low concentration oxidizing agent aqueous solution, then passed through a cleaning funnel 32, and then wound up.

In this case, the device becomes very compact.

In addition, as shown in "Figure 1", heating
If 2 and oxidation process 22 are separated, it is convenient in the following points.
That is, since cupric oxide is semiconductive, the second embodiment has poor efficiency in electrical heating, but the first embodiment can. In the second embodiment, it can be said that the method of humidification heating is better. Embodiment 3 This is a case where it is carried out at the same time as the grandchild anchor.

This is possible in both the cases of FIGS. 1 and 2. At this time, the steel wire 10 is heated to 500 to 600 degrees centigrade. Therefore, the reaction time is also shorter. The rest is the same as in the above example. Effect of the invention '1} Since the oxidizing agent is a gas, it is not rapidly cooled like a liquid.

Can maintain high temperature oxidation reaction state. Therefore, the oxidation reaction progresses, and a film of a predetermined thickness can be obtained in a short time. Furthermore, the film thickness can be adjusted by controlling the temperature. ■ The entire device becomes more compact.

'3} It is also possible to perform the dulling and oxidation treatments at the same time.

'4' The copper wire 1 with a cupric oxide film formed on its surface in the oxidizer 22 is still in a high temperature state. If you put it in regular cooling water, it will cause a heat shock as described above, and the oxide film that has been formed will peel off. However, in this case, since the material is cooled by placing it in a low-concentration oxidizing agent aqueous solution, an exothermic reaction occurs and rapid cooling is prevented, and the oxidized film is also prevented from peeling off. (2) Since the oxidizing gas 24 is blown, the oxidation reaction is promoted.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 are explanatory diagrams of different examples of devices used to implement the present invention. 10... Copper wire, 12... Heating, 20...
...Inert gas, 22... Oxidation likely, 24.
...Oxidizing gas, 34...Heating seems to oxidize. Figure 1 Figure 2

Claims (1)

[Claims] 1. A continuously running copper wire 10 is heated and oxidizing gas is blown onto it to form a film of cupric oxide on the surface of the copper wire 10, and then placed in a cooling tank containing a low concentration oxidizing agent aqueous solution. A method for forming an insulating film on a copper wire, characterized by cooling the copper wire 10 through a wire.