a novel multilayer film is made by extruding and / or casting at least two layers of resin , such as polyacrylonitrile homopolymer or interpolymers . by co - extruding a continuous multilayer film with contiguous or tandem dies from a first supply of homogeneous resin solution and a second supply of non - homogeneous redissolved resin scrap , a film may be cast onto a smooth cooled drum surface to form substantially continuous adjacent layers from two or more resin supplies . scrap resin , such as selvage trimmed from stretched film or mill scrap , is comminuted and redissolved in solvent for recycle to the second supply of the extrusion step . the homogeneous layer prevents film disruption by inhomogeneities present in the contiguous layer containing redissolved scrap , which might cause localized stresses in the film and discontinuities during stretching .