JPS58199517A - Method of producing condenser - 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 relates to a method of manufacturing a multilayer capacitor.

Film capacitors have become laminated and miniaturized, and when manufacturing these laminated capacitors, dielectrics and electrode foils are alternately placed around the outer periphery of a large-diameter drum, and a predetermined tension is applied to achieve a set number of layers. After winding, the ring-shaped multilayer capacitor base material is removed from the winding drum and cut into a predetermined size to form a single capacitor element. Then, the cut capacitor element can be placed in a case and protected with resin, and used as the desired capacitor, or it can be used as a separation material during winding of the dielectric or electrode foil. Tape is inserted to protect the sides of each capacitor element cut from the capacitor base material.

However, with this method, films such as electrode foils and dielectric materials on both sides of the capacitor element cut from the capacitor base material may peel off, and separation materials may peel off, making it difficult to manufacture a capacitor according to the design.

The invention was made in view of this, and in the manufacture of multilayer capacitors, a sheet-like separating material made of thermosetting resin or the like is completely rolled at the beginning of the winding of the capacitor base material, windings P and J, and the base material is completed. The gist of the present invention is to manufacture a capacitor element in which the capacitor element is then subjected to metallization treatment and heat treatment, cut into units, and both sides of the capacitor element are protected and packaged with the separating material.

The present invention will be explained below based on examples. In the figure, 1 is a winding core (winding body) that is formed into a winding to the required thickness of the base material of a multilayer capacitor or a laminated thickness, and this winding core has a predetermined diameter and is omitted from the illustration. is configured to rotate at a rotation speed set by a drive device. At least one roll of dielectric material 2 is disposed so as to face the outer peripheral surface of core 1. The number of rolls is determined by the combination of metallized film, electrode foil, plastic film, etc. The number of rolls of dielectric material 2 wound around core 1 is predetermined based on the capacitance of the capacitor element to be formed. When this metallized film, etc. is rolled, at the beginning of winding it around the winding core 1, that is, on the outer periphery of the winding core 1, a separating material 6, for example, a sheet-shaped thermosetting resin tape (epoxy resin) is applied, and a thermosetting material is applied to the inner fabric of the plastic film. After a material coated with a dielectric resin is rolled up one or more times, a desired dielectric material is rolled up. Then, if only one layer of the capacitor element is wound around the outer periphery of the core, that is, only one layer of the capacitor element is wound around the outer periphery of the core, the above-mentioned separation is applied to the outermost surface of the dielectric winding end. The material 3 is wound at least once or more. In addition, when two or more layers of capacitor elements are wound around the core in the radial direction, the separating material 3 is wrapped around each layer of the element as shown in the figure. The separating material 3 is at least double-layered so that the capacitor elements in the inner and outer layers can be separated and independent from each other by the separating material 3, and heat-curing is applied between the contact surfaces of the separating materials so that the separating materials of each layer can be easily separated. Processing to prevent adhesion (for example, (1) on the surface to be separated)
Either apply a coating of grease or insert an auxiliary separator made of plastic film, thin metal plate, or other film, etc., and wind up the material together.

Of course, at the beginning of dielectric winding, the separating material 3 wound around the outer surface of the winding core does not adhere to the winding core surface, but adheres to the dielectric surface. It is inserted and wound in such a way that it is not bonded but is bonded to a circular dielectric material.

Next, metallicon treatment 5 is applied to both sides of the capacitor base material 4 formed as described above, and heat treatment is performed by heating to such an extent that the separation material has adhesive strength due to thermosetting. Through this heat treatment, both sides of the capacitor element, i.e., the inner and outer surfaces of each element in the capacitor base material, are adhesively bonded to the outside*1+ part of the dielectric with the thermosetting resin as the separating material, making it difficult to peel off. be protected. Next, this capacitor base material 4 is cut into the desired capacitor elements.

According to the present invention, both sides of the capacitor element (the surfaces not subjected to metallicon treatment) are protected by thermosetting resin, and the dielectrics on the inner and outer sides are bonded together by the adhesive force of the resin. After cutting from the capacitor base material, the capacitor element has the advantage that the dielectric on both sides does not peel off, and a capacitor having performance as designed can be easily manufactured.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the method of forming the capacitor base material, Figure 2 is a side view of the capacitor base material wound in multiple layers, Figure 3 is a cross-sectional view of Figure 2, and Figure 4 is the separation material. 5 is an external view of a completed capacitor element, FIG. 6 is a sectional view thereof, and FIG. 7 is a diagram of a known capacitor element. 1... Winding core 2... Dielectric 3... Separation material 3a... Auxiliary separator 4... Capacitor base material 5... Metallicon treatment 6... Lead rock 1 Figure 1 Figure 9 A Figure 2 Figure A

Claims (1)

[Claims] (1) In the production of multilayer capacitors, a sheet-like separation material made of thermosetting resin or the like is wound at the beginning and end of the winding of the condensate base material, and after the base material is completed, metallicon treatment and heat treatment are performed. A method for producing a capacitor, characterized in that the capacitor element is cut into units and both sides of the capacitor element are protected and packaged with the separating material. C2) In manufacturing multilayer capacitors, the capacitor base material is wound at the beginning and between the capacitor elements in the inner and outer layers on a sheet-like separating material made of C such as a thermosetting resin, and the dielectric material is wound at the end of the winding. The separation material is rolled up to form a capacitor motherboard, and then metallicon treatment and heat treatment are performed on both end faces of the separation material so that the capacitor elements are separated between the separation materials in each layer, and the separation material is A method of manufacturing a capacitor, in which both sides of a capacitor element are covered and protected, and then each unit is coated with 4 Elri.