JPS6051256B2 - Capacitor manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a capacitor that has excellent productivity, excellent characteristics, and allows effective use of materials used.

First, we will explain the conventional manufacturing method of capacitors in Figure 1~
This will be explained using FIG.

Figure 1 shows the framework method.

Capacitor elements 1 made of metalized paper or metalized organic film are arranged in a frame 3. At this time, capacitor element 1
In order to perform separation after thermal spraying, use the partition plate 2. iEguchi Lt →mu'1-1)-・^! , 1 ■
,,・W-F74〃In order to prevent particles from entering during thermal spraying, masks 4 are fitted from both sides of the frame 3. This method was difficult to automate because it was a manual process, which resulted in poor workability and the adhesion of thermal spray particles to the jig. FIG. 2 shows the thermal spraying process in this framework method. As shown in FIG. 1, the capacitor element group whose framework has been completed is continuously transported by a transport device 6. On the other hand, thermal spraying is performed from the side while keeping the thermal spraying gun 5 fixed. In this method, the effective adhesion area is small compared to the continuous spraying area, the yield of the sprayed material is poor, and the spraying thickness is thick at the center and becomes thinner toward the periphery. The disadvantage was that there were variations in the results. FIG. 3 is a diagram showing a separation method after thermal spraying, in which the capacitor element 1, partition plate 2, frame 3, and mask 4 are separated.

In this method, an artificial external force is applied to the capacitor element 1 and the partition plate 2 to separate them, resulting in peeling or cracking of the sprayed surface of the capacitor element 1, which leads to deterioration of the dielectric loss tangent (tan δ) characteristic J of the capacitor. Something happened. The present invention solves the problems in the conventional example,
The present invention provides a capacitor manufacturing method that can improve productivity, improve the yield of thermal sprayed materials, and stabilize electrical characteristics.

Hereinafter, an embodiment of the present invention will be explained using the drawings of FIGS. 4 to 7. Figure 4 shows the taping process in the manufacturing method of the present invention, in which the element deformation strength is 1k between the masking tapes 7 and 8 coated with a non-tacky neoprene rubber and epoxy resin mixed adhesive on the sealing surface at room temperature.
Insert the capacitor element 9 that has been heat-braced to 9 or more using the element insertion lever 10, press and heat the portion of the masking tapes 7 and 8 between the capacitor elements 9 using the upper and lower sealing dies 11, and attach the masking tape with an adhesive. 7,8
and wrap the capacitor element 9 with both ends exposed.

Thereafter, by repeating this operation, the capacitor elements 9 are continuously wrapped and formed into a band shape in which the capacitor elements 9 are arranged adjacently with the masking tapes 7 and 8, and then wound into a reel shape as shown in FIG. The width of the masking tapes 7 and 8 is 1.5Tf larger than the width of the capacitor element 9.
Set 0rL wide to prevent thermal spray particles from entering. FIG. 6 shows the thermal spraying process, in which nine groups of capacitor elements that have been continuously sealed in a band shape and wound up in a reel shape are conveyed in two parallel rows by a continuous conveyance device 12.

On the other hand, the thermal spray gun 13 is attached downward from the top of the conveying device 12, and performs thermal spraying while reciprocating in a direction B perpendicular to the traveling direction A of the conveying device 12. After spraying on one side, the 9 groups of capacitor elements are reversed and sprayed on the other side in the same manner. The separation process is shown in FIG. 7, in which the masking tapes 7 and 8 are pulled out left and right from the take-up reel 14 after thermal spraying, passed through the guide roller 15 and sweeper 16, and then passed between the feed roller 17 and the receiving roller 18! Set to . The masking tapes 7 and 8 are separated by the rotation of the feed roller 18, and the capacitor element 9 attached to the masking tapes 7 and 8 is separated by the sweeper 16 and collected 3 individually in the chute 19.

Then, lead wires are connected to the sprayed electrodes of each capacitor element 9, and an exterior is applied to form a capacitor.

As described above, the manufacturing method of the present invention uses a mixed adhesive of a neoprene rubber adhesive and an epoxy resin, which is not sticky at room temperature, for the masking tape at a low temperature (60 to 60℃).
70°C) and in a short time (0.2 to 0.5 sec), is non-adhesive at room temperature, does not cause the film of the capacitor element 9 to peel off during the separation process, and also because the masking tape is heated and pressurized. There is no welding material attached to the sealing die, and the process can be performed stably and at high speed.
Masking tape can be bonded, and masking tape can be separated smoothly without cutting the masking tape.

In addition, by performing the thermal spraying method according to the present invention, the effective spraying area relative to the total spraying area is higher than that of the conventional method, and the yield of the thermal spraying material used can be improved.Moreover, the thermal spraying gun does not have to move back and forth. Since the thermal spraying is performed while the spraying is being carried out, the thermal spraying patterns overlap, and the thermal spraying thickness becomes uniform.

By increasing the number of reciprocating movements of the thermal spraying gun, the variation in the thermal spraying thickness can be further reduced. Furthermore, the method of separating capacitor elements in the method of the present invention does not apply artificial external force, so there is no cracking or peeling of the sprayed surface, there is no adverse effect on the dielectric loss tangent (Tanδ) of the capacitor, and the electrical characteristics are improved. You can achieve stability.

As described above, according to the manufacturing method of the present invention, it is possible to improve the productivity of the capacitor thermal spraying process, reduce material loss, and stabilize the electrical characteristics of the capacitor.

[Brief explanation of drawings]

1, 2, and 3 are perspective views showing each step of a conventional capacitor manufacturing method, and FIG. 4, FIG. 5,
6 and 7 are perspective views showing each step of a method for manufacturing a capacitor according to an embodiment of the present invention. 7, 8... Masking tape, 9... Capacitor element, 13... Thermal spray gun.

Claims (1)

[Claims] 1. Capacitor elements are placed adjacently between two pieces of masking tape coated with a mixed adhesive of neoprene adhesive and epoxy resin, and the mixed adhesive is applied by heating and pressing only the masking tape between each capacitor element. The capacitor elements are wrapped with adhesive and exposed at both ends, and the group of capacitor elements is continuously conveyed, and metal is sprayed from above using a spray gun that reciprocates in a direction perpendicular to the direction of movement of the capacitor elements. 1. A method for manufacturing a capacitor, which comprises: after spraying, separating the masking tape to take out a single capacitor element, providing leads on the sprayed metal, and packaging the capacitor element.