| 摘要 |
PURPOSE:To manufacture a biaxially oriented film which has few whiskers and is favorable in slitting properties, by controlling a crystalline grain diameter and crystalline facial orientation index of a polyester film so as to satisfy a specific formula. CONSTITUTION:A film is manufactured by controlling a polyester crystalline grain diameter Sc, crystalline facial orientation index Xi and n of an obtainable biaxially oriented polyester film so that a formula is satisfied by those. If the film is less than 5 of the formula, this means that the above parameters Sc, Xi, n of the film do not satisfy the formula. As the film is manufactured by controlling those parameters Sc, Xi, n, the film which has very few whiskers and is extremely favorable in slitting properties can be obtained stably. |
