| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyester film resistant, even on an occasion for heating and transporting the same, to surface scratches and wrinkling; and a method for manufacturing the same.SOLUTION: The provided polyester film satisfies the following formulae (1) through (4): W/1000<[(S-S)/C/100]<2W (1); 0<(S-S)<0.5 (2); -1<(S+S+S)/3<3 (3); and 0<C<0.2 (4) (Sexpresses, of film width direction edges, the MD thermal shrinkage (%) of the film on the side having the greater MD thermal shrinkage; Sexpresses, of the film width direction edges, the MD thermal shrinkage (%) of the film on the side having the lesser MD thermal shrinkage; Sexpresses the MD thermal shrinkage (%) of the film median portion along the film width direction; Cexpresses, of the film width direction edges, the maximal value [m] of the magnitude of the curvature of the side having the greater MD thermal shrinkage; W expresses the film width [m]). |
