| 摘要 |
A film for film capacitors having a thickness of 10 microns or less, is manufactured by the successive steps of: mixing and preparing a forming material composed of a thermoplastic resin composition; melting and extruding the forming material to a film through a T-die; pinching and cooling the film between a pressure roll and a cooling roll having a rough surface for forming a rough surface to the film, wherein the rough surface of the cooling roll has (&sgr;/Ra) of 0.2 or less, and the rough surface of the film has (&sgr;/Ra) of 0.2 or less, where (Ra) is an arithmetic average roughness defined by a method specified in JIS B 0601 2001, and (&sgr;) is a standard deviation; and rolling up the cooled film onto a winding tube in a winding unit. |
