JPS5946712A - Method of baking enameled wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a preheating furnace together with a scorching furnace for lengthening and heating enameled electric wires, and this preheating furnace is supplied with exhaust heat from the scorching furnace or annealing furnace to The present invention relates to a method for baking enamelled electrical wires in which the running wire is preheated prior to application of the coating material.

Baking of enamelled wire is generally done from the bottom to the evaporation zone,
Using a baking furnace that has a curing zone, a cooling zone, etc., the wire coated with the enamel coating material is run from the bottom to the top of the baking furnace, during which time the solvent in the enamel coating material is evaporated and hardened. This process is repeated several times to obtain the finished product.

However, according to this type of conventional method, the running wire is heated in the evaporation zone of the baking furnace using a built-in heater or hot air, and the solvent t in the enamel coating material is heated.
- However, in this case, it is difficult to rapidly heat the coating material deep inside the tube because the heating starts from the outside of the coating material. Curing occurred and the evaporation of the deep internal solvent was inhibited, resulting in the formation of bubbles. Therefore, in order to uniformly heat the enamel coating material deep into the center, it was necessary to heat it slowly and gently. For this reason, the linear speed of the running wire could not be increased very much, and there was a limit of its own, resulting in poor productivity.

The present invention has been made in view of the above circumstances, and includes a preheating furnace in addition to the baking furnace, and the preheating furnace is equipped with a preheating furnace in which the heat is fed from the baking furnace or from the annealing furnace used in the wire annealing process. In addition, the running wire is preheated before the application of the enamel coating material, and after the application of the enamel coating material,
Immediately, due to the heat accumulation of the kneading, the solvent in the encrusted material starts to evaporate from the inside, after which it is led to a baking furnace and heated.
Nozuke is a treatment that eliminates the generation of bubbles and greatly improves the processing speed.

Hereinafter, one embodiment 'f of the present invention will be explained in detail with reference to the drawings.

In the figure, 1 is a baking furnace, which has an evaporation zone 2, a curing zone 3, a cooling zone 4, etc. from the bottom, and a preheating furnace 5 is provided in the vicinity thereof. In the case of this example, specifically, on the back side of the baking furnace 1, from the evaporation zone 2 to the cure zone 3,
It is constructed with a common wall between the two rooms. That is, the preheating furnace 5 is formed integrally with the baking furnace 1.

On the sides of the baking furnace 10, on the sides of the evaporation zone 2 and the curing zone 3, there are branch-connected hot air passages 6I for circulating hot air, and an air supply lower 1 for taking in outside air.
An exhaust port 8 for exhaust gas is provided. And then,
A blower 9 and a catalyst for solvent combustion (CcS) 180 are installed in the necessary locations of the hot air passage 6, and a heater 11 is installed in the furnace of the evaporation zone 2.

Therefore, the hot air heated by the evaporation sea 72 is circulated, and is distributed not only in the evaporation zone 2 but also in the cure zone 3.
Air is also blown out.

On the other hand, in the side part of the cooling zone 4 of the baking furnace 1, an air supply port 12 and an air exhaust port 13 are provided for supplying or discharging cold air, and the cold air is circulated by a blower (not shown) or the like. That's what I do.

A branched connecting passage 14 is provided from a part of the hot air passage 6 of the curing zone 4 arranged as described above, the tip of which is connected to the air supply port 15 at the lower end of the preheating furnace. The upper furnace is provided with an exhaust port 16 for discharge. Immediately, the exhaust heat from the curing zone 3 can be supplied to the preheating furnace 5. In the preheating furnace 5, preferably, the wire side and the passage on the heat F (side) are separated by a partition wall 17 in order to prevent the adverse effects of neo-proboscis, e.g., enamel scum, on the hot air side.

In the upper and lower parts of the baking furnace 1 and the preheating furnace 5 configured as described above, for example, above the lower end and the upper end of the baking furnace 1, rolls 18, 19, and 19 on which a wire strip W is suspended and circulated are installed. It is.

In order to burn an enameled electric wire in the Noki Furnace 1 and the Preheating Furnace 5 configured in this way, first, at the beginning of baking, the wire W fed from the annealing furnace is rolled into a roll 1.
B, 19, and run inside the preheating furnace 5 from top to bottom. During this running, the wire W is moved to the cure zone 3 of the baking furnace 1.
The exhaust heat is preheated and the temperature is raised to a predetermined temperature. The enamel coating material is applied thereto by means of a coating device 20 installed, for example, on the inlet side of the evaporation zone 2 of the baking oven 1. At the same time as applying the wire, due to the heat storage of the wire W,
The temperature of the coating material is increased from the inside and rapid evaporation of the solvent is initiated. In the state B, the wire W is subsequently introduced into the baking furnace 1, and baked in the same manner as before. At this time,
The evaporation seam 72 is heated from the outside by the heating heater 11, but due to the heat storage due to the preheating of the nine-wire rod W as described above, the inside of the coating material has already been heated and evaporation of the solvent has started. Therefore, there is no generation of bubbles due to the evaporation prevention effect of the solvent. That is, the entire thickness of the coating material can be heated quickly and uniformly. Therefore, it is possible to heat the wire material rapidly using a heating heater with a relatively large amount of heat, and thereby the wire rod W can be drawn at a significantly higher speed.

From next time onwards, baking can be done by repeating the opening of roll 18 and roll 19 as many times as necessary.When baking is complete, wind up from roll 19 onto an external reel, and the finished enamelled wire is obtained. It will be done.

In the above-mentioned preheating and baking process, the heating of the preheating furnace 5 is carried out from the exhaust heat of the curing zone 2 of the baking furnace 1, so that energy can be used effectively. Evaporation zone 2 located at the back and in a high temperature state
Since it is integrated with the cure zone 3, there is little heat dissipation and extremely high thermal efficiency.

Oka, in the above example, the preheating furnace was integrally formed on the back side of the baking furnace, but this is not the only structure. For example, the inner furnaces may be spaced apart and arranged in parallel or in series. Further, exhaust heat to the preheating furnace can be supplied from various sources within the factory, but for example, in the case of a gas-type lamp and stub furnace, exhaust heat can also be supplied from this furnace.

As explained above, according to the present invention, a preheating furnace is provided together with the baking furnace, and the preheating furnace is supplied with exhaust heat from the baking furnace or the annealing furnace. Since the wire is circulated at high energy efficiency, it is possible to obtain high-quality enameled wires that do not produce bubbles in the enamel coating. Furthermore, it is possible to run at high speeds and has extremely high productivity. Baking of enamelled wire can provide a method.

[Brief explanation of the drawing]

The figure is a schematic explanatory diagram showing the configuration of a baking furnace and a preheating furnace useful in carrying out the baking method for enameled electric wire according to the present invention. 1@... Baking furnace, 2... Evaporation zone, 3.e.Cure zone, 4... Cooling zone, 5... Preheating furnace,
W...Wire rod.

Claims (3)

[Claims] (1) A method for baking enameled wires in which baking is performed in a baking furnace having six firing zones, a curing zone, and a cooling zone, in which a preheating furnace is provided near the baking furnace;
A method for baking the enameled wire is characterized in that the preheating furnace is supplied with waste heat from the baking furnace or annealing furnace, etc., so that the wire can be preheated before the application of the enamel coating material. (2) A method for baking an enameled electric wire according to claim 1, characterized in that the running wire is allowed to circulate between the heating furnace and the preheating furnace. (3) A method for decorating an enameled electric wire according to claim 1 or claim 2, characterized in that the preheating furnace is formed integrally with one side of the baking furnace.