JPH05250940A - Manufacture of enamel wire - Google Patents

Abstract

PURPOSE:To effectively restrict oxidation, color change, and generation of grains or bubbles by using pure water/alcohol mixed liquid for liquid coolant for cooling a high temperature annealed copper wire. CONSTITUTION:A hard-drawn copper wire 1 is sent through an annealing furnace 2 to be a high temperature annealed copper wire 1a, and the high temperature annealed copper wire 1a is sent through a cooling tank 8 including liquid coolant to be a cooled annealed copper wire 1c. Pure water/alcohol mixed liquid 5 is used for this liquid coolant. Next, the annealed copper wire 1c is supplied through a paint tank 10 including enamel paint 3, a metal die 11, and a baking furnace 4 to obtain an enamel wire 1b. The mixed liquid 5 of the coolant is completely vaporized by this, thereby oxidation, color change, or generation of grains or bubbles can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an enameled wire.

[0002]

2. Description of the Related Art An enameled wire is a hard conductor wire which is annealed by continuously passing through a high temperature annealing furnace, and then a coolant,
For example, it is designed to be baked by being passed through industrial water for cooling, being naturally dried after being cooled, and then being passed through an enamel paint tank, a drawing die and a baking oven.

[0003]

When a soft wire immediately after passing through an annealing furnace is cooled by passing it through a cooling tank containing industrial water, it is softened by inorganic ions dissolved in water, oxygen entrapped, etc. There was a problem that the conductor wire was oxidized or discolored.

Further, when the baking speed of the enamel wire is increased, the natural drying of the cooling water does not catch up, and the water adhering to the surface enters the paint tank, and there is a problem that particles and foaming are generated during the enamel baking.

The present invention has been made in view of the above points, and an object of the present invention is to provide a method for producing an enameled wire which is free from oxidation and discoloration, and is free from particles and foaming. ..

[0006]

The above object can be achieved by using a pure water / alcohol mixed liquid as a liquid coolant.

[0007]

Since the above means is provided, the pure water / alcohol mixed solution is free of inorganic ions and organic impurities, and the pure water / alcohol mixed solution is completely evaporated during natural drying. It is to effectively prevent oxidative discoloration.

[0008]

EXAMPLES Next, the present invention will be specifically described by way of examples.

[Embodiment 1] FIG. 1 shows an embodiment of the present invention. The hard conductor 1 is passed through an annealing furnace 2 to form a high-temperature soft conductor 1a, and the high-temperature soft conductor 1a is passed through a liquid coolant to be cooled, and then the enamel paint 3 is applied onto the cooled soft conductor 1a. Then, in the manufacturing method of the enamel wire 1b, which is manufactured by baking the enamel paint 3 applied by passing through the baking furnace 4, pure water / alcohol mixed liquid 5 was used as the liquid coolant in this embodiment. By doing so, the pure water-alcohol mixed liquid 5 is free of inorganic ions and organic impurities, and the pure water-alcohol mixed liquid 5 is completely evaporated during natural drying. It is possible to obtain a method for producing the enamel wire 1b which is free from the influence of the above, does not cause oxidation or discoloration, and does not cause particles or foaming.

A hard lead wire 1 drawn from a sending bobbin 6
Is passed through the annealing furnace 2 via the guide pulley 7 to become the high-temperature soft conductive wire 1a. This high temperature soft lead wire 1a
Is passed through a cooling tank 8 containing a pure water / alcohol mixed liquid 5 to form a cooled soft conductor 1c. A small amount of pure water-alcohol mixed liquid 5 is attached to the surface of the cooled soft lead wire 1c, but it easily volatilizes because it contains alcohol, and when passing through the guide pulley 9, pure water-alcohol mixed liquid 5
The alcohol mixture 5 is completely volatilized. Next, the soft lead wire 1c is passed through a paint tank 10 containing the enamel paint 3, and then passed through a metal die 11 to squeeze out excess enamel paint 3 and passed through a high-temperature baking furnace 4 to obtain the soft lead wire 1c. The upper enamel paint 3 is baked.

Application of this enamel coating 3, die squeezing,
The high temperature baking step is usually repeated 5 to 15 times to form the enamel wire 1b, which is wound around the winder 14 via the guide pulleys 12 and 13. In the figure, 15 to 20
Is a guide pulley.

The pure water / alcohol mixed solution 5 used in this embodiment is a mixture of 100 parts by weight of ion-exchanged water and 30 parts by weight of ethyl alcohol. Since this pure water / alcohol mixed liquid 5 has no inorganic ions or organic impurities, it is free from oxidative deterioration or discoloration, and even if an oxidized surface is produced due to the reducing action of alcohol, the oxide film can be completely removed. it can. In addition, since it contains alcohol, even if the enamel wire is baked at a high speed, it has a good vaporizing ability and does not mix water in the enamel paint.

As a result, there is no discoloration of the enameled wire, good adhesion with the conductor, no generation of particles or foaming, and excellent electrical and mechanical properties can be exhibited.

As described above, according to this embodiment, an enameled wire having excellent characteristics without particles and foaming is obtained, which is industrially useful.

It is possible to improve the evaporation by mixing the pure water / alcohol mixed solution with another hydrophilic organic solvent such as methyl ethyl ketone, acetone, methyl isobutyl ketone, n-methylpyrrolidone or dimethylacetamide.

Further, in this embodiment, the pure water refers to water in which inorganic ions and organic impurities are not mixed, and is, for example, distilled water, ion-exchanged water or the like.

The alcohol used in this embodiment is methyl alcohol, ethyl alcohol, isopropyl alcohol, butanol, ethylene glycol, glycerin or the like.

In this embodiment, the mixing ratio of pure water and alcohol is not particularly limited, but it is desirable that the addition ratio of alcohol is 5 to 150 parts by weight with respect to 100 parts by weight of pure water. This is because if the amount is 5 parts by weight or less, the effect of adding alcohol is not exerted, and conversely, if the amount is 150 parts by weight or more, the cooling efficiency is lowered and a fire risk occurs.

[0019]

As described above, according to the present invention, since the pure water / alcohol mixed liquid is used as the liquid coolant, the pure water / alcohol mixed liquid is free of inorganic ions and organic impurities, and the pure water / alcohol is dried during natural drying. It is possible to obtain a method for producing an enameled wire in which the mixed solution is completely evaporated and eliminated, the influence of water as in the past is eliminated, there is no oxidation or discoloration, and no grain or foaming occurs. ..

[Brief description of drawings]

FIG. 1 is an explanatory view of an apparatus according to an embodiment of a method for manufacturing an enameled wire of the present invention.

[Explanation of symbols]

 1 Hard Conductive Wire 1a High Temperature Soft Conductive Wire 1b Enamel Wire 1c Cooled Soft Conductive Wire 2 Annealing Furnace 3 Enamel Paint 4 Baking Furnace 5 Pure Water-Alcohol Mixture

Claims (1)

[Claims] 1. A hard conductor is passed through an annealing furnace to obtain a high-temperature soft conductor, the high-temperature soft conductor is passed through a liquid coolant to be cooled, and then an enamel paint is applied onto the cooled soft conductor. Then, in a method for producing an enamel wire, which is produced by baking the applied enamel coating by passing through a baking oven, pure water-alcohol mixed liquid is used as the liquid coolant, and the enamel wire is produced. Method.