METHOD AND APPARATUS FOR PRODUCING POLYMER FILM, POLYMER FILM, POLARIZING PLATE AND LIQUID CRYSTAL DISPLAY

摘要

A dope including a polymer and a solvent is prepared. The dope is casted from a casting die (43) to a casting belt (46) with forming a casting bead (100), to form a casting film (69). The decompression chamber (68) is provided behind the casting bead (100). An area including the casting die (43) and the decompression chamber (68) is partitioned as a casting section (105) from other sections by a first partition (102) and a second partition (103). A volume of the casting section (105) is set in a range of 0.80m<SUP>3</SUP> to 300.00m<SUP>3</SUP>. Inside the casting section (105) is decompressed by a decompression chamber (68) while a fluctuation of air pressure is less than 2.00Pa. A wind shielding member 101 is provided between the casting die (43) and the decompression chamber (68), to shield wind from behind the casting bead (100).