Method of treating optical film, apparatus of treating optical film, and method of manufacturing optical film

Abstract

An object of the present invention is to provide a method of treating an optical film wherein coating defects such as chatter, coating streaks and comet failure which are easily caused, when coating a functional layer such as an anti-reflection layer on a long-length film, are improved, as well as an apparatus of treating an optical film. Disclosed is a method of treating an optical film possessing the steps of rubbing a long-length film transported with elastomer moisturized with liquid, and removing the liquid on a surface of the long-length film, wherein an elastomer surface has a static friction of 0.2-0.9.

1 . A method of treating an optical film comprising the steps of: 
 (a) rubbing a long-length film transported with elastomer moisturized with liquid; and    (b) removing the liquid on a surface of the long-length film,    wherein an elastomer surface has a static friction of 0.2-0.9.    
   
   
       2 . The method of  claim 1 , 
 wherein the elastomer is a surface-modified rubber.    
   
   
       3 . The method of  claim 1 , further comprising a step of adjusting a transporting position by detecting an end position of width of the long-length film.  
   
   
       4 . The method of  claim 1 , 
 wherein a temperature of the liquid is in a range of 30-100° C., and a temperature of the elastomer is in a range of 30-100° C.    
   
   
       5 . The method of  claim 1 , 
 wherein the long-length film is rubbed with the elastomer while pressing a back surface of the long-length film.    
   
   
       6 . The method of  claim 1 , 
 wherein before the long-length film is rubbed with the elastomer moisturized with the liquid, a treated surface of the long-length film is moisturized with liquid in advance.    
   
   
       7 . The method of  claim 6 , 
 wherein the treated surface is moisturized with a device of supplying liquid onto the treated surface of the long-length film.    
   
   
       8 . The method of  claim 6 , further comprising a step of supplying liquid between the long-length film and the elastomer.  
   
   
       9 . The method of  claim 1 , 
 wherein a period of time during which the treated surface is moisturized is in a range of 2-60 sec.    
   
   
       10 . The method of  claim 1 , 
 wherein the long-length film has a thickness of 30-70 μm.    
   
   
       11 . An apparatus of treating an optical film comprising 
 a device of rubbing a long-length film transported with elastomer moisturized with liquid, and    a device of removing the liquid on a surface of the long-length film,    wherein an elastomer surface has a static friction of 0.2-0.9.    
   
   
       12 . The apparatus of  claim 11 , further comprising a device of adjusting a transporting position by detecting an end position of width of the long-length film.  
   
   
       13 . The apparatus of  claim 11 , further comprising a device of adjusting a temperature of the liquid to 30-100° C. and a device of adjusting a temperature of the elastomer to 30-100° C.  
   
   
       14 . The apparatus of  claim 11 , further comprising a device of pressing a back surface of the long-length film.  
   
   
       15 . The apparatus of  claim 11 , further comprising a device of moisturizing a treated surface of the long-length film with liquid in advance before rubbing the long-length film.  
   
   
       16 . The apparatus of  claim 15 , 
 wherein the device of moisturizing the treated surface is a device of supplying liquid onto the treated surface of the long-length film.    
   
   
       17 . The apparatus of  claim 15 , 
 wherein the device of moisturizing the treated surface is a device of supplying liquid between the long-length film and the elastomer.    
   
   
       18 . The apparatus of  claim 11 , 
 wherein a treating time between a starting point of moisturizing the treated surface with a device of moisturizing the treated surface and a termination point of removing the liquid with a device of removing the liquid is in a range of 2-60 sec.    
   
   
       19 . A method of manufacturing an optical film, comprising a step of coating a functional layer onto the treated surface of the long-length film after conducting treatment via the method of  claim 1 .  
   
   
       20 . The method of  claim 19 , 
 wherein the functional layer is an anti-reflection layer or an actinic radiation curable resin layer.    
   
   
       21 . The method of  claim 20 , 
 wherein the long-length film is a cellulose ester film, and the liquid is water.