| 摘要 |
A process for producing a microporous polyolefin film in which formation of an uneven film due to uneven removal of an extractant is inhibited and high-speed drying is rendered possible and which thereby renders the high-speed continuous production of a microporous polyolefin film possible. The process for producing a microporous polyolefin film comprises forming a composition comprising a polyolefin resin and a plasticizer into a film by extrusion molding, stretching the film, subsequently removing the plasticizer by extraction with a solvent, and then drying the resultant film,wherein after the extraction of the plasticizer and before the drying, the film is brought into close contact with a roll or the width of the film is mechanically fixed, and a liquid (heat medium) that has a temperature not lower than the boiling point of the solvent is brought into contact with the film, while maintaining the close contact with the roll or the fixing of the width, to thereby heat and dry the film. |
