For those making films from soluble polymers, we urge you to take a look at the Roto-Film ™.
The Precision Thickness Film Maker produces thin films which are highly reproducible from sample to sample using hardened steel spacers to separate the two mirror finish optically polished surfaces for the anvils. The entire assembly and the sample are placed between heated platens, heated to close to the softening point and pressed with a hydraulic press to form the film. By using matte finished foil inserts between the anvils, interference fringes can be avoided. Excess sample runs off into a trough to prevent interference with the formation of the film. A water cooled chamber is provided into which the entire assembly with the film can be inserted for cooling after the film has been pressed.