Method for manufacturing resin film for thin film-capacitor and the film therefor

Abstract

The present invention provides a resin film for a film capacitor making it possible to obtain the excellent heat resistance, materialize a reduction in a size of the film capacitor and an increase in a capacity thereof and satisfy a reduction in a thickness of the film and a high voltage resistance thereof. In a manufacturing method in which an extruding equipmentis charged with a molding materialto extrude a filmfor a film capacitor from a T dice, in which the above extruded filmfor a film capacitor is interposed between plural rolls in a receiving deviceand cooled and in which the above cooled filmfor a film capacitor is wound on a winding tubeof a winding device, 100 parts by mass of a polyetherimide resin is blended with 1 to 10 parts by mass of a fluorocarbon resin to prepare the molding material; the above molding materialis extruded through a filterhaving apertureswhich are 0.5 to 6 times or less as large as an average thickness of the filmfor a film capacitor, which is provided between the extruding equipmentand the T dice; and a thickness of the filmfor a film capacitor is controlled to 10 μm or less.