Patent ID: 7771639

Claim:
A polymer film producing method in which dope containing polymer and solvent is cast on a moving support to form a cast film, said cast film is stripped from said support to obtain a polymer film containing said solvent, and said polymer film is dried, said polymer film producing method comprising steps of: causing a first dry gas to flow toward said cast film through a first gas outlet positioned to face said support; causing a second dry gas to flow through a second gas outlet such that the path of a flow of said second dry gas is substantially parallel to a moving direction of said support in the vicinity of the second gas outlet and the flow of the second gas out of the second gas outlet is positioned higher than a height of a first flow path of a flow of said first dry gas and a height of said first gas outlet relative to said support; and wherein a height H 1 of said first flow path relative to said support is equal to or more than 20 mm and equal to or less than 300 mm.