| abstract |
[Problem] To provide a polyester film having a small difference in physical properties in the width direction, excellent in productivity, and suitable for magnetic recording media, printer ribbons, capacitors, plate making, photography, cards, and the like. thing. After stretching an unstretched film containing polyethylene terephthalate as a main component in a longitudinal direction and a width direction, the film is cooled to a glass transition temperature or lower. A method for producing a polyester film, which comprises irradiating UV light from at least one direction in the thickness direction of the film, and a polyester film produced by the method. |