JPS62102510A - Side masking of capacitor device - 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 <Industrial Application Field> The present invention relates to a masking method carried out when metal spraying is carried out on both ends of a cylindrical capacitor element, and particularly to a masking tape used at that time.

<Prior art> The masking method used during the manufacturing process of metallized plastic film capacitors is as follows: (a) Paper masking tape is wrapped around the sides of each capacitor element, and the tape is placed in a jig and aligned. , or a method that requires a lot of man-hours, such as bundling with string or tape, spraying metal onto the end face, and then peeling off the masking tape while removing each piece one by one; There is a method of sandwiching capacitor elements between two pieces of adhesive tape with the adhesive side facing inside, so that a large number of capacitor elements are connected in an egg shape. Alternatively, water-soluble (gum) tape was used.

<Problems to be Solved by the Invention> The base materials for the masking tape used in the conventional masking method as described above include kraft paper, crepe paper,
Polyester film, polypropylene film, etc. are used, but paper tape has low strength, so
When the masking tape is peeled off after metal spraying, the tape may be torn from the edge, or one side of the paper may be torn, leaving the device as a sandwich.

Furthermore, if the masking tape is made of plastic, it will bend or tear because it is flexible and easily torn.

If the masking tape was applied with a slight bend, a gap would occur between the tape and the element, causing problems such as metal wrapping around the sides of the capacitor during metal spraying.

<Means for Solving the Problems> This invention was made to solve the problems of the conventional method as described above. In a known masking method for sandwiching capacitor elements such as shapes, the masking tape has a porosity of 40 to 90 on its adhesive surface.
%, i.e. the fiber part is 60-10% and the void part is 4%.
A material in which 0 to 90% fiber layers are bonded together is used.

<Example> Fig. 1 shows an example of a masking tape used in the present invention, in which 1 is a base material of the masking tape, 2 is an adhesive layer, and 3 is a fiber layer, the porosity of which is 80%. It is.

That is, the fiber portion accounts for 20% and the void portion accounts for 80%.

This fiber layer may be manufactured using warp yarns 5 and wire system 6 as shown in FIG.
or only the line system 6 as shown in FIG. 2 (a).

That is, only the porosity of this fiber layer 3 is important. If the porosity is less than 40%, no matter how thin the fibers are, the adhesive will not adhere well to each other, which may result in poor adhesion, and if the porosity exceeds 90%, thick fibers Even if fibers are used, the effect will be lost and there is a risk of adhesion to the plastic film on the surface of the capacitor element and tearing the film, and the reinforcing effect of fibers will also be reduced, so it is necessary to select the base material. .

Put two pieces of masking tape A as above into its fiber layer 3.
If the capacitor elements B are placed facing each other and placed at regular intervals as shown in FIG. In the element B part, the fiber layer 3 of the tape A prevents the adhesive layer 2 from adhering to the plastic film on the outer periphery of the element B, and in the pressure bonding member 4 part, the adhesive layer 3 penetrates through the fiber layer 3. The agent layers 2 adhere to each other.

At the time of bonding, each capacitor element B is arranged such that both end surfaces thereof are perpendicular to the running direction of tape A and are slightly inside from both side surfaces of tape A.
Hold it using a jig etc.

<Effects> As mentioned above, the masking tape used in the masking method of the present invention has a porosity of 40 to 9 on the adhesive surface on the base material.
Since this masking tape is laminated with 0% fiber, when this masking tape is wrapped around a capacitor element, the fiber layer prevents the adhesive layer of the tape from adhering to the plastic film on the surface of the element. , the plastic film of the element will not be torn when the masking tape is peeled off from the element.

Furthermore, even if the adhesive were to stick to the plastic film, due to the presence of the fiber layer, it would not form a continuous strong bond, but instead would stick in dots, so the plastic film would not be broken.

The fiber layer also exerts a cushioning effect on the exterior of the capacitor element, making it difficult to wrinkle or meander.

Furthermore, do not apply pressure to the adhesive part of the two tapes.
By pulling, the fibers are buried in the adhesive layer, so the adhesive layer rises to the surface and the adhesives can adhere to each other.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway perspective view showing an example of the masking tape used in the present invention, Fig. 2 (a), (b), and (C) are plan views showing each side of the fiber layer, and Fig. 3 is a masking state. FIG. 4 is an enlarged vertical sectional front view showing a part of the same as above. △... Masking tape B... Capacitor element 1... Base material 2... Adhesive layer 3...
・Patent attorney Kazu, representative of the fibrous layer applicant 1) Showa 1

Claims (1)

[Claims] A cylindrical capacitor element is placed between two pieces of masking tape made of adhesive tape with the adhesive side facing inside, and its both end surfaces are positioned at right angles to the running direction of the tape and slightly inside the tape end surfaces. In the masking method, the tape is completely covered with tape to completely cover the outer peripheral surface of the capacitor element to form a capacitor element chain, and the tape is peeled off after metal is thermally sprayed on the end face of each capacitor element while winding up the element chain. A method for masking the side surface of a capacitor element, characterized in that a fiber layer having a porosity of 40 x 90% is attached to the adhesive surface of the capacitor element.