Patent ID: 8767296
Filing Date: 2014-07-01
Classification: B29C,B29D,B29K,G02B

Abstract:
1. An apparatus for preparation of a film exhibiting polarizing properties by dyeing a substrate film with iodine and then orienting the same through a continuous process, the apparatus comprising: a first bath equipped with a thermometer to measure a temperature of the first bath, in which a polyvinylalcohol (PVA) film as a substrate film is washed; a second bath equipped with a thermometer to measure a temperature of the second bath and a densitometer to measure a concentration of the second bath, in which the washed PVA film is dipped in an iodine solution and dyed therein; a third bath in which the iodine-dyed PVA film is stretched by a drawing roller to thereby orient the dyed iodine; an oven equipped with a thermometer to measure a temperature of the oven to dry the iodine-oriented PVA film; and a central controller that predicts a transmittance of the polarizing film, on the basis of information regarding characteristics of input data measured by the above thermometers of the first and second baths and the oven as well as the densitometer of the second bath, and information regarding characteristics of a PVA film introduced into the continuous process, and then, controls the temperatures of the first and second baths and the oven and an amount of a composition fed to the second bath.