| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method for a biaxially oriented film of various superior characteristics. SOLUTION: A central section of a non-oriented film is formed of at least three layers in the thickness direction when viewing from the width direction, and both ends are so coextrusion laminated as to form a single-layer structure in the thickness direction, and as polyester constituting both ends, a polyester B other than a polyester A constituting an outermost layer of the central section is used, and the glass transition point of the polyester B is 50 deg.C or above, while the thickness ratio of the polyester B constituting an inner layer of the central section is set less than 0.3 to the total thickness of a film. |
