Patent ID: 8305547

Claim:
A method of manufacturing a polarizer, comprising: a width direction stretching process for stretching a hydrophilic polymer film in the width direction, which is continuously supplied, by gripping both ends in a width direction thereof with grips and moving the grips in a longitudinal direction of the hydrophilic polymer film as well as by bringing the hydrophilic polymer film into contact with liquid and also moving at least one of the grips, which grip both ends in the width direction of the hydrophilic polymer film, outwardly in the width direction of the hydrophilic polymer film; and a dyeing process for dyeing the hydrophilic polymer film by a dichroic material, wherein, in the width direction stretching process, a contact with the liquid is carried out by at least one of spraying and coating of the liquid, wherein the width direction stretching process is carried out in at least one of the dyeing process and a process other than the dyeing process, wherein, in the width direction stretching process, there is a virtual line that connects inner ends of the grips in a width direction of the hydrophilic polymer film, the grips being adjacent in a longitudinal direction of the film, and the region inside of the virtual line is brought into contact with the liquid and a region outside of the virtual line is not brought into contact with the liquid, and wherein, in the contact with the liquid in the width direction stretching process, a region inside of a second virtual line that is 5 mm inside of the virtual line in a width direction of the film is brought into contact with the liquid and a region outside of the second virtual line is not brought into contact with the liquid.