Patent ID: 7070718
Filing Date: 2006-07-04
Classification: B29C,B29D,B29K,B32B,G02B

Abstract:
1. A method for manufacturing a polarizer comprising a stretching processing process, a dyeing treatment process, and a boron compounds treatment process to a polyvinyl alcohol film, wherein the stretching processing is performed at least twice so that a total stretching ratio is 5.5 times or more, and in a second stretching processing or later, wet stretching processing having stretching ratios of 1.2 times or more is performed by applying a peripheral velocity difference between a first pinch roll and a second pinch roll, and in the wet stretching processing, a film conveyed out from the first pinch roll is passed on a first guide roll so as to make a holding angle (A) of 120 through 175° on a first guide roll to which the film first contacts.