Abstract: An improved method for the attachment of lead electrodes to metallized film capacitors is disclosed herein. Capacitors of this type are formed by winding thermoplastic dielectric films, each having a conductive coating, into a coil and applying conductive electrodes to the opposite axial ends of the coil, forming an electrical bond with the metallized surfaces of the dielectric windings. The invented method provides for a two part heat curing of the capacitor. After the capacitor is wound into a coil, it is clamped and then heated at a moderate temperature below its rated operating temperature for a sufficient period of time so as to impart mechanical stability to the device. A "schooping" material is then sprayed on the axial ends of the capacitor, allowing for the deep penetration of the material between offset layers of the capacitor.

Abstract: In the method of manufacturing capacitors, elongated thermpolastic dielectric film having a conductive coating associated therewith is wound on a mandrel. Thereafter, heat is applied to the winding to shrink the thermoplastic material to tighten it. This method had been improved by depositing moisture or volatile material to the film during winding thereof to act as a lubricant between the successive layers of the film. Preferably, the electric component is heated at atmospheric pressure so that the lubricant will evaporate slowly to remain within the winding during heat shrinking to provide lubrication between the successive layers of the film. Thereafter, the components are heated in a vacuum to evaporate all remaining lubricant. Preferably the heat shrinking takes place immediately after the lubricant is deposited on the film before it has evaporated from the winding and before it has corroded the conductive coating.