JPS6129729Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to a continuous electrodeposition apparatus for continuously manufacturing insulated wires by electrodeposition. Immediately after being electrodeposited on a conductor, the electrodeposited layer is in a state where the deposited resin is deposited in a stone wall shape, and if it is baked in that state, only an insulating film with pinholes will be obtained. Therefore, in order to solve this problem, the electrodeposition layer is treated with high-temperature water or steam prior to baking, and the resin in the electrodeposition layer is strongly coagulated to form a continuous film. things are being done. By the way, when a water-dispersed varnish is used as an electrodeposited varnish, a large amount of water remains in the electrodeposited layer, but according to research by the present inventors, it is possible to treat it with high-temperature water or steam. The treatment effect varies greatly depending on the amount of water remaining in the electrodeposited layer. That is, if the residual moisture content is too small, there is a problem that cracks may occur in the electrodeposited layer before water treatment is performed. On the other hand, if the residual moisture content is excessive, foaming may occur in the electrodeposited insulating film due to excessive moisture evaporation from the electrodeposited layer during high-temperature water or steam treatment and during baking, resulting in poor dielectric breakdown strength. A film cannot be obtained. According to subsequent research by the inventors of the present invention, good water treatment can be performed when the residual water content is about 30 to 60% by weight relative to the amount of precipitated resin. By using the device of the present invention shown in the above range, the moisture content immediately after departure and landing can be kept within the above range, and by using the device of the present invention, insulated wires with excellent dielectric breakdown strength can be continuously produced by electrodeposition. can be manufactured. The attached figure is a sectional view of an embodiment of the present invention, in which 1 is an electrodeposition bath filled with aqueous varnish 11, and a cylindrical or ring-shaped electrode 12 is provided on the outlet side (water surface of the aqueous varnish). is installed. In addition to cylindrical shapes, electrodes may have one or two parallel electrodes.
It may be a flat plate electrode or one of other shapes. When L is the length from the entrance to the exit of the electrodeposition bath 1, the length l of the electrode 12 is 0.005L to 0.3L. L varies depending on the linear speed of the electrodeposited conductor W that continuously runs from bottom to top in the direction of the arrow, but the linear speed is 10~
The speed is about 50 m/min, and in that case, L is suitably about 20 to 200 cm. 2 is a DC power source, one end of which is connected to the electrodeposited conductor W via a power supply member 21, and the other end is connected to the electrode 1.
2 are connected to each other. The polarity of the electrode and electrodeposited conductor is determined by the type of aqueous varnish 11 used. The power source 2 is a DC power source that can apply a DC voltage between the electrodeposited conductor W and the electrode.
3 is a water treatment device 4 installed directly above the electrodeposited bath.
is a baking furnace installed above it. The electrodeposited conductor W continuously traveling in the direction of the arrow is electrodeposited in the electrodeposition bus 1 . The electrodeposited layer is known in the water treatment equipment 3 (for example, in Japanese Patent Application Laid-Open No.
138689) using high-temperature water or steam, and baked in a baking furnace 4 at a known baking temperature. Using the device of the present invention, the electrodeposited conductor W and the electrode 12
When electrodepositing by applying a DC voltage between the varnish and the varnish, the water content of the electrodeposited layer will be approximately the above value regardless of the type of aqueous varnish, so immediately water treatment is performed in the device 3. Good results can be obtained. On the other hand, even if the electrode length is longer or shorter than the above-mentioned length, or even if the electrode is installed at the entrance or center of the electrodeposition bath, the moisture content of the electrodeposition layer will remain within the above-mentioned range. As a result, an insulated wire with good voltage resistance characteristics cannot be obtained. In the present invention, since a short electrode is installed on the exit side of the electrodeposition bath, the electrodeposited conductor W is exposed to a gradually stronger electric field as it progresses from the entrance to the exit. The upward electrodeposition progresses gradually near the entrance and becomes more rapid toward the exit, but at the same time as this electrodeposition progresses, the action of the electric field tightens the electrodeposited layer and the dehydration phenomenon occurs as a result of this action. As a result, an electrodeposited layer having the moisture content described above is obtained. The attached table shows the results of manufacturing insulated wires using the devices of various examples and comparative examples. In the same table, the water content of the electrodeposition layer indicates the water content of the electrodeposition layer before water treatment.
Breakdown strength and appearance are for baked electrodeposited layers. The temperature of the electrodeposited layer is 400℃ after electrodeposition.
water vapor for about 5 seconds, then heat to the highest temperature.
Baked at 400℃. Varnishes A, B, and C shown have the following compositions. Also, the wire size is 0.5mmφ, and the coating thickness is
The linear velocity is 0.025mm and 20m/min. Varnish A: Epoxy-acrylic emulsion resin concentration approximately 20% Varnish B: Commercially available acrylic varnish, Cavalite
(Manufactured by Dupon't) Used after diluting the resin concentration to approximately 20%. Varnish C...Commercially available acrylic varnish Ercusol
(Manufactured by Bayer) Diluted to a resin concentration of approximately 20%.

【table】

【table】 [Brief explanation of drawings]

The attached figure is a sectional view of an embodiment of the present invention, in which 1 is an electrodeposition bath, 12 is an electrode installed at the outlet of the electrodeposition bath, 2 is an electric wire, 3 is a high-temperature water or steam treatment device,
4 is a baking furnace.

Claims (1)

[Scope of utility model registration request] an electrodeposited bath filled with water-dispersed varnish; an electrode with a length of 0.005L to 0.3L (L is the length between the inlet and the outlet of the electrocoat bath) installed close to the outlet of the bath;
It is characterized by comprising a voltage applying device capable of applying a DC voltage between the electrodeposited conductor and the electrode, and a device that treats the electrodeposited layer on the conductor with high-temperature water or steam. Continuous electrodeposition equipment.