JPS58128167A - Device for applying paint to core wire - Google Patents

Abstract

PURPOSE:To obtain a titled device which is capable of obtaining a resin baking electric wire having an excellent insulating property, by constituting so that a resin solution of low viscosity is applied onto the first layer and a resin solution of normal viscosity is applied onto the second layer and thereafter, and preventing admixtures from mixing into the applied film of the second layer and thereafter. CONSTITUTION:The first painting material bath 51 and a receiving tank 53, and the second painting material bath 52 and a receiving tank 54 are separated by a partition wall 55, and between said baths and receiving tanks, circulate-feeding gear pumps 81, 84 of a painting material are provided, respectively. Also, in said first painting material bath 51, a resin solution of lower viscosity than normal viscosity is stored, and in the second painting material bath 52, a high viscosity resin solution of a normal value is stored. A core wire (w) passes through the first painting material bath 51, a painting material 10 pulled along by a floating die 9 is separated, a thin applied layer is applied, and also adhering admixtures are removed. The admixtures mixed into the painting material can be taken out of the system easily by incorporating a filter in a painting material circulating path of the first painting material bath 51.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paint coating device for a core wire, and more specifically, a paint coating device for coating a core wire with a solution of enamel resin, etc. It is related to.

To manufacture a resin-baked electric conductor such as enamel 1, a viscous solution of an electrically insulating resin such as enamel resin is applied to the surface of a core conductor, and then this core 11 is run through a baking furnace to remove the coated resin. The paint (resin solution) is dried and baked to form a first layer coating on the core wire, and the same process is repeated multiple times to form coatings from the IKz layer to the i-th layer, and eventually A total of n layers of coating 1a are formed on the enamel 1 and resin baking electrode I! This is what you get. When manufacturing such resin-baked electric wires, it is common to use an integrated process of 1 meter starting from the Shinichi process in order to eliminate process losses such as replacing the core wire bobbin and increase production efficiency. It's here,
In other words, number one! l! As shown in QK, a plurality of core wires W drawn to a predetermined diameter by a wire drawing machine I are continuously placed at the inlet and outlet sides of the resin baking furnace 6 after passing through the annealer B and the cooling water tank 8. guide sheep 4A,
A plurality of turns (n turns) are made over 4B, and during this time, the core 11w repeatedly travels through the paint applicator 5 and the baking furnace 6 n times in this order to bake the n-layer coating film on the 6174w, Then, the obtained resin-baked electric wires are sequentially wound up by a winding device 7.

Now, in the manufacturing process of such resin-baked electric wires, the conventional paint applicator F1 consists of a single paint applicator bus consisting of five people, as shown in Fig.
The paint (resin solution) contained in the spinning paint application bath 6A is sequentially applied to all six turns from the th turn to the nth turn. For this reason, fine contaminants such as metal powder that adhere to the surface of the embroidered core iW in the above-mentioned Shin'ichi process can be easily removed during the subsequent cooling process. # from the top of Iw! Although it is removed, the remaining part remains attached to 611W and is carried into the paint application bath 6A and mixed into the resin solution inside this bath, causing 0 paint applications from the 1st to the nth paint application. l of the heart IIw with the resin solution each time! There is a risk that the surface will be coated. As a result, the resin-baked electric wire such as enameled wire is coated with a first layer from the side closer to the core wire W, as shown in FIG.

Contaminants p will be mixed in each layer of the second layer coating 18 to IInJIIklIN with an almost equal probability, and this will lower the dielectric strength voltage of the resin baked wire and cause serious defects that are one of the causes of bottle hole defects. It was an invitation.

The present invention has been made in order to eliminate such defects in the conventional paint application equipment, and the invention is to replace the paint application equipment with a first paint application bath for forming the first layer coating II of the laminated layer to be baked with resin. and a paint application bath for the second and subsequent times that form the second and subsequent coatings, and the resin solution having a viscosity lower than the specified value is supplied to the paint application bath for the 11th time. This indicates that the person has done t*.

An embodiment of the present invention will be described with reference to FIG.

FIG. 8 shows 5j! of the present invention, which corresponds to the paint applicator shown by reference numeral 5 in FIG. 1 and @B. This is an enlarged view of the paint application device of the example, in which the first paint application bus 51 and the eighth paint application bus 52 are separated by a partition wall 5"5. The first paint application path 51 is A first paint receiving tank 58 is provided below it to receive the paint (resin solution) flowing down from the core wire insertion hole, and a second paint application bath 5B for the same purpose is provided below. A paint receiving tank 54 is provided, and both the first and second paint receiving tanks 5
8.54 is also separated by the partition wall 55 mentioned above. A pipe 82 connected to the discharge side of a gear pump 81 for circulating paint is connected to the first paint application bath 51, and a pipe 8B is connected to the gear pump 81 from the first paint receiving tank 58.
is connected to the suction side of the resin solution to form a circulation path for the resin solution. Similarly, a pipe 85 from the discharge side of the gear pump 184 communicates with the second paint application bath 52, and a pipe 85 returns from the second paint receiving tank 54 to the suction side of the gear pump 84, forming a circulation path for the resin solution. Ru. In FIG. 8, reference numeral 9 indicates a floating die, reference numeral 1O indicates a paint column formed by being dragged by the core 11jJw, and reference numeral 11 indicates a liquid volume limiting plate.

A resin solution having a viscosity lower than the specified viscosity is circulated in the 1llIl paint application bath 51, and is a dedicated application bath for applying the first coating to the heart IwI#. Thus, a resin solution having a specified viscosity is circulated through the eighth paint application path 58, and the paint application operation from the second time onward in Stw is performed. In other words, in this invention, the paint application device 5 is separated into a first paint application bus 61 that contains a low viscosity resin solution and an eighth and subsequent paint application bus 52 that contains a high viscosity resin solution of a prescribed value. This is what is being done.

According to the apparatus of the present invention, since the first applied paint has a viscosity lower than the specified value, it is possible to
The thickness of the coating that adheres to the surface of is thin. In other words, a first layer coating film is formed that is thinner than the first layer coating film performed using a conventional device, and contaminants such as metal powder generated during the wire drawing process are removed from the first layer coating film. and second paint application) (because the baths 51 and 52 are separated by 1m, they exist only in the first paint application bath 51, and therefore, as shown in FIG. 4(b), these The impurities p are mixed only in the thin 111II11 film 12, and the coating films 18 to N after the IIz layer are not mixed at all and have a thick specified thickness, and these Since the coating layer 1B is completely covered, the insulation properties of the resin coating layer on 6111W as a whole are sufficiently good69, and a high-quality resin-coated electric wire with little risk of pinhole formation can be obtained. Note that the resin solution in the I11 paint application path 51 is
Since it has a lower viscosity than that in the second paint application bath 5z, which is in charge of paint application after the IB time, the same type of solution will naturally have a smaller specific gravity, so this III paint application bath! In 5IP3, there is a greater possibility that contaminants -P will settle at the bottom of the coating bath, and a favorable situation is expected in which the probability of these contaminants (2) being mixed into the first layer coating film 12 is further reduced. It is something.

Another embodiment of the invention, not shown, is a gear pump 81. A transit device is provided in the resin solution circulation path of the first paint application bath including the pipes sg and ss, preferably in the middle of the pipe 88, to collect contaminants ptP. ζ Fading #i Although the first layer coating film 1B is surprisingly likely to contain contaminants P, the electrical insulation percentage as a resin-baked electric wire is further improved.

As explained above, according to the present invention, the paint coating device includes an I[l paint coating bath for forming the first layer coating film containing a resin solution having a viscosity lower than a specified viscosity, and a monolipid solution having a specified viscosity. The first layer of paint is formed relatively thinly, and contaminants such as metal powder are separated from the eighth paint coating bath for forming the second and subsequent layers. Since it is confined only within the coating film, and a pure thick coating film with a specified viscosity is applied on top of it, there is no pinhole generation and it is possible to obtain resin-baked electricity with excellent insulation properties. There is.

In addition, according to the configuration in which a transit device is provided in the resin solution circulation path of the GIL paint application bath, impurities in the paint can be actively removed. By passing the resin solution with low viscosity (high fluidity) through dense filter paper, the degree of contaminants mixed in the first layer coating can be further reduced, resulting in even better quality. It is possible to obtain a resin-baked electric wire.

[Brief explanation of drawings]

Fig. 1 is a simplified side view showing the overall configuration of resin-baked electric wire manufacturing equipment, Fig. 2 is a front view showing a part of the conventional paint application device in the manufacturing equipment of Fig. 1 in cross section, and Fig. 8 is BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially broken front view showing a paint applicator according to an embodiment of the present invention. 51...1st paint application bus, 52...2nd f1! i
Material coating bath, W... core wire, 55... bulkhead. Agent Patent Attorney Mamoru Takeuchi 4th Edition (b) Figure 2 Procedural Amendment Document Showa 55-934 Indication of the Case of Mr. Haruki Shimada, Commissioner of the Patent Office Showa s7 Tokyo Patent Application No. 10341 2, Title of Invention 6 So Relationship between the paint application device 3 and the case of the person making the amendment Patent applicant address No. 1 Homare, Kiba-chome, Koto-ku, Tokyo Name (51g
) II Kura Electric Wire Co., Ltd. Representative Katsuo Kawamura 4, Agent residence No. 2-15-13 Uchikanda, Chiyoda-ku, Tokyo Amendment O page 9 of the statement of contents, ``Brief explanation of the drawings'' amended as follows O commuting do. Fig. 1g is a simplified Confucian diagram showing the overall configuration of the resin-baked electric wire manufacturing equipment, Fig. 3 is a cross-sectional view of a part of the conventional paint application device in the manufacturing equipment of Fig. 1, and Fig. 3 is a front view. FIG. 4 (a) is a schematic cross-sectional view showing the state of the nine-resin-baked electric IIO coating coated by the conventional O paint coating apparatus. , 1II
Figure i4 (b) is a schematic cross-sectional view showing the state of the coating film O of the nine-resin-baked electric wire coated with this @O paint application device.

Claims (2)

[Claims] (1) In a paint coating device that repeatedly applies a viscous solution of an electrically insulating resin to the surface of a core wire, the paint coating device has a coating bath containing a low viscosity resin solution and a specified value. An apparatus for applying paint to a core wire, characterized in that it is separated into a second and subsequent paint application bath containing a high viscosity resin solution. (2) In a paint application device that repeatedly applies a viscous solution of an electrically insulating resin to the core surface multiple times, the paint application device has a first paint application bath containing a low viscosity resin solution and a prescribed value. e* indicates that the first paint application bath is separated from the second and subsequent paint application baths containing the high viscosity resin solution, and that a transit device is incorporated in the resin solution circulation path in the first paint application bath. , equipment for applying paint to core wires.