| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a polarizing plate making high transmittance and high polarization degree compatible with each other and a liquid crystal display device. SOLUTION: The method for manufacturing the polarizing plate comprises a step for dyeing a polyvinyl alcohol(PVA) film with iodine or a dye having dichroism, a step for cross-linking the PVA film with a cross-linking agent and a step for stretching the PVA film with rolls in either of the steps. In the case of cross-linking the PVA film in a bath containing the cross-linking agent after dyeing it in a dyeing bath containing >=0.02 wt.% iodine or the dye having dichroism, the stretch ratio is kept in the range of 1-5 times the length of a PVA film raw sheet before immersion in the cross-linking bath and is kept in the range of >=1.01 and <=4 times the previous length during and after the cross-linking including subsequent immersion in the cross-linking bath. Furthermore, the total stretch ratio from the PVA film raw sheet to the final product is kept in the range of <=8 times the initial length. |
