Method of producing layer capacitors
AssigneeSiemens Aktiengesellschaft
InventorHubert Kraus
Life of this patent
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Abstract
In the production of electric stack or layer capacitors, which capacitors are produced, in part, by sawing through a mother capacitor, a polyolefin layer is placed on the mother capacitor prior to cutting in order to provide lubrication during cutting and in order to improve the insulation at the cutting edges. The invention is advantageously employed in the production of layer capacitors having polyethylene terephthalate layers as the dielectric.
Claims5
In a method of producing layer cpacitors in which synthetic dielectric layers carrying metallic coatings are formed into a multilayer mother capacitor, in which individual capacitors are cut from the mother capacitor by sawing and the synthetic layers shrink at the cut edges due to the heat generated during sawing causing the metallic coatings adjacent the cut edges to break up into islands which oxidize to become insulating islands and in which the saw blade is lubricated during sawing, the improvement therein comprising the steps of:
- applying a meltable polyolefin layer to the mother capacitor before sawing as a lubricating layer;
- advancing the saw blade relative the mother capacitor to first penetrate the polyolefin layer prior to penetration of the remainder of the mother capacitor;
- melting the polyolefin material during sawing;
- and spreading the melted material along the surfaces produced by sawing to nearly completely seal those surfaces.
Dependencies are inferred from the claim text.