Patent ID: 9138947
Filing Date: 2015-09-22
Classification: B29C,B29D,B29K,G02B

Abstract:
1. A method for producing a polarizer, comprising: subjecting a polyvinyl alcohol film to at least a dyeing process, a crosslinking process and a stretching process, then subjecting the polyvinyl alcohol film, in which all of the processes have been performed, having a water content of 25 to 55% by weight to a drying process, wherein the dyeing process is performed by allowing iodine to adsorb to and align in the polyvinyl alcohol film, in the drying process, the water content of the polyvinyl alcohol film is reduced by at least 15% by weight, so that the polyvinyl alcohol film has a water content of 5 to 35% by weight, and the drying process comprises bringing the polyvinyl alcohol film into contact with a heating roller and blowing hot air, thereby performing a quick drying stage in which the water content of the polyvinyl alcohol film is reduced by at least 10% by weight in a time period of ½ to 1/30 of the total drying time of the drying process.