Disclosed is a film constituted of a polyester, said film having a degree of roll set curl of not higher than 135 m⁻¹ after being subjected to heat treatment, and having a degree of recovery curl of not higher than 45 m⁻¹ after being subjected to hot water bath treatment.
                            本发明公开了一种由聚酯构成的薄膜,所述薄膜在经过热处理后的卷曲度不高于 135 m-¹,在经过热
水浴处理后的恢复卷曲度不高于 45 m-¹。