Process for the production of an electric stack or layer capacitor

In a process of producing capacitors, synthetic dielectric layers carrying metal layers thereon are wound, in a stretched condition, about a drum to form a mother capacitor. Individual capacitors are then formed from the mother capacitor by sawing, with a rotating saw blade, through the mother capacitor. Due to the heat which is developed during sawing, the stretched layers contract in the region of sawing causing a break up of the metal layers which then oxidize to form insulating islands. This process is improved by applying an insulating lubricant to the saw blade to increase the dielectric strength of the capacitors at the saw cuts.