Patent ID: 8524133

Claim:
A method for manufacturing a film for a film capacitor, comprising the steps of: feeding a molding material into an extruding equipment, extruding a film for a film capacitor downward from a lip part of a T die tip thereof, interposing the above extruded film for a film capacitor between a pressing roll and a cooling roll to cool it, and winding up the above cooled film for a film capacitor having a thickness of 10 μm or less on a winding equipment, wherein the molding material comprises a polyetherimide resin that is mixed with a fluorocarbon resin, wherein a ratio V/y of the circumferential speed V [m/s] of the cooling roll to the shear rate y [/s] of the molten molding material in the lip part of the T die is 3.0×10 −2 to 90×10 −2 [m] and wherein the method excludes biaxial stretching.