| 摘要 |
PROBLEM TO BE SOLVED: To provide a polarizing film which exhibits high absorbance and a high degree of polarization for light in a long wavelength region.SOLUTION: A method of manufacturing a polarizing film is provided, where a PVA-based polymer film having a crystal long period of 14.5 to 16.0 nm in water is put through processes of dyeing, uniaxial stretching, dye fixing, and drying. When the PVA-based polymer film is formed using a film forming apparatus having a plurality of drying rolls and heat treatment rolls, the film is dried such that Tin an equation (I) is between 60 and 75. T={T×(40-V)+T×(V-V)}/(40-V) (I), where Trepresents surface temperature (in °C) of a first drying roll and Vrepresents a volatilized portion (in mol%; between 10 and 30) of the film when peeled from the first drying roll, while Trepresents an average value (in °C) of the surface temperatures of second through final drying rolls and Vrepresents a volatilized portion (in mol%) of the film when peeled from the final drying roll. |
