METHOD FOR MANUFACTURING BIAXIALLY ORIENTED POLYESTER FILM

摘要

PROBLEM TO BE SOLVED: To provide a method for manufacturing a biaxially oriented polyester film which shows high dimensional stability and a small physical property difference in the width direction. SOLUTION: This method for manufacturing the biaxially oriented polyester film is characterized in that a monoaxially oriented film obtained by orienting a substantially non-orientated polyester film in the length direction, with a heat shrinkage stress in the length direction of 6.0 N/mm2 or less over the overall width and a difference in the heat shrinkage stress in the width direction of 10% or less, is further oriented in the width direction.