Patent ID: 7455801
Filing Date: 2008-11-25
Classification: B29C,B29D,B29K,C09K

Abstract:
1. A method of producing a cellulose film, comprising the steps of: casting a dope prepared by dissolving a macromolecular material in a solvent on a casting support; stripping the cast dope from the casting support to form a film; subjecting the stripped film to tentering to stretch or regulate the film in a width direction of the film; while drying the tentered film to a solvent content in the film within a range of 3 to 8 wet base % by weight; and subjecting the tentered film to roll drying to dry the film at one temperature range while conveying the film in such a manner that the film engages with a plurality of rolls, wherein a surface temperature of the film during the roll drying is kept within said one temperature range, wherein said temperature range is Tg (glass transition temperature) of the film −15° C. to the Tg, and a rate of expansion of the film in a conveying direction of the film is kept within a range of −2% to 3%.