| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for forming an optical film for sufficiently suppressing the entrainment of bubbles caused by an accompanying wind to a casting film and avoiding the deterioration of the optical quality of a formed optical film even if high-speed formation is performed, in a solution casting method. <P>SOLUTION: The method of forming optical film includes a casting process of casting a resin solution 51 to a moving support 12 from a die 11 to form the casting film 52 where during the casting process, a gas having density lower than the density of air is supplied to a space over the support 12 of the upstream side in the movement direction of the support 12 from a casting ribbon R until the resin solution 51 ejected from the die 11 is landed to the support 12. In the method of forming the optical film, it is preferable that the gas is supplied toward the inner side from the outer side in the width direction of the support 12, the gas is supplied over at least the width of the casting ribbon R toward the support 12 from the upper side of the support 12, the density of the gas at the standard state (0 °C, 1 atm) is 1 kg/m<SP POS="POST">3</SP>(n t p) or lower and the temperature of the gas is -50 to 20 °C. <P>COPYRIGHT: (C)2012,JPO&INPIT |
