Preparation of casein films by a modified wet spinning process

Casein films prepared by a modified wet-spinning process were studied using microscopy and measurements of physico-chemical and mechanical characteristics. The pH of the film-forming solution was critical for film properties. The most effective films were formed with pH 9 film-forming solutions. They had low solubility in water and highest tensile strength (4.5 MPa), highest percentage elongation at break (68.6%) and lowest water vapor permeability (3.9 10(-10) g.m(-1).s(-1).Pa-1) values. Scanning electron micrographs revealed that those films had a denser ultrastructure than the others.