Process for producing roll of microporous plastic film

Abstract

A microporous plastic film roll production method, comprising the steps of: conveying microporous plastic film having through-holes in its interior by using a plurality of conveyance rollers at least one conveyance roller of which has a surface roughness RzJIS (μm) of 0.3≦RzJIS≦30 and has a surface made of fluorine resin, silicone rubber, or a composite material containing one of them; and winding it up in a roll.

1 . A microporous plastic film roll production method comprising the steps of: conveying microporous plastic film having through-holes in its interior by using a plurality of conveyance rollers at least one conveyance roller of which has a surface roughness RzJIS (μm) of 0.3≦RzJIS≦30 and has a surface made of fluorine resin, silicone rubber, or a composite material containing one of them; and winding it up in a roll. 
     
     
         2 . A microporous plastic film roll production method as described in  claim 1  wherein the surface of the conveyance roller is made of polytetrafluoroethylene. 
     
     
         3 . A microporous plastic film roll production method as described in  claim 1  wherein the microporous plastic film has a Gurley air permeation resistance of 10 to 1,000 seconds per 100 ml. 
     
     
         4 . A microporous plastic film roll production method as described in  claim 1  wherein the microporous plastic film has a porosity of 30% or more. 
     
     
         5 . A microporous plastic film roll production method as described in  claim 1  wherein the microporous plastic film has an average micropore size of 50 to 200 nm. 
     
     
         6 . A microporous plastic film roll production method as described in  claim 1  wherein the microporous plastic film has a cushion rate of 15% or more and less than 50%. 
     
     
         7 . A microporous plastic film roll production method as described in  claim 1  wherein the microporous plastic film has a thickness of 50 μm or less. 
     
     
         8 . A plastic film roll production method as described in  claim 1  wherein the microporous plastic film has a width of 100 mm or more. 
     
     
         9 . A microporous plastic film roll production method as described in  claim 1  to wherein the coefficient of static friction between the microporous plastic film and the conveyance roller is 0.6 or less. 
     
     
         10 . A microporous plastic film roll production method as described in  claim 1  wherein the microporous plastic film is designed to serve as a separator of secondary batteries or capacitors.