POLYVINYL ALCOHOL-BASED FILM AND POLARIZING FILM

摘要

PROBLEM TO BE SOLVED: To provide a large-width polyvinyl alcohol-based film which has uniform optical performance even in a large area and which is suitable for a polarizing film to be used in a large screen liquid crystal display. SOLUTION: The polyvinyl alcohol-based film is obtained in a drum film formation process and is specified to have <=0.5μm/mm variance in thickness in the TD direction of the film, 20 to 150μm film thickness and >=2 m film width.