| 摘要 |
本发明提供一种满足下述式(1)~式(4)的聚酯膜及其制造方法。;W/1000<[(Ss1-Ss2)/CS1/100]<2W…(1) ;0<(Ss1-Ss2)<0.5…(2) ;-1<(Ss1+Ss2+SCT)/3<3…(3) ;0<Cs1<0.2…(4);[Ss1表示膜宽方向的端部中MD热收缩率较大一侧的膜的MD热收缩率[%]，Ss2表示膜宽方向的端部中MD热收缩率较小一侧的膜的MD热收缩率[%]，SCT表示膜宽方向的膜部的MD热收缩率[%]，CS1表示膜宽方向的膜端部中MD热收缩率较大一侧的端部的弯曲的大小的最大值[m]，W表示膜宽[m]] This invention provides a polyester film and method of production thereof satisfying following formulae (1) to (4). ;W/1000 < [(Ss1-Ss2) /CS1/100] < 2W …;0 < (Ss1-Ss2) < 0.5 …;-1 < (Ss1+Ss2+SCT) /3 < 3 …;0 < Cs1< 0.2 …;[Ss1represents MD thermal shrinkage [%] of film side having larger MD thermal shrinkage in edge portion in a film width direction, Ss2represents MD thermal shrinkage [%] of film side having smaller MD thermal shrinkage in edge portion in a film width direction, SCTrepresents MD thermal shrinkage [%] of central portion of film in a film width diretion, CS1represents a maximum bending value [m] of a side having larger MD thermal shrinkage in film edge portion in a film width direction, and W represents a film width [m]]. |
