Patent ID: 7708921

Claim:
A solution film-forming method comprising: a casting process for forming a dope by dissolving a polymer with a solvent, and casting the dope onto a moving support to form a cast web; a peeling and conveying process for peeling said cast web off said support to convey said cast web by use of conveyer rollers which rotate while being in contact with said cast web on its opposite surface from said support; and a tenter drying process for drying said cast web while holding opposite lateral sides of said cast web by holding members, as said cast web is conveyed from said peeling and conveying process, wherein said peeling and conveying process has a length that is 10% to 80% of a width of said cast web, and wherein the method further comprises a process of blowing said cast web from above said cast web in laterally outward directions of said cast web to stretch curls in the lateral sides of said cast web, at the end of said peeling and conveying process or immediately before said tenter drying process.