Method for forming air permeable film

摘要

PROBLEM TO BE SOLVED: To provide a method for forming a nonwoven fabric-like continuous film having elasticity and sufficiently air permeability on the surface of a substrate consisting of natural materials or plastic materials made of synthetic resins by solving the problem of single fibers and the problem of vapor of an organic solvent. SOLUTION: This method for forming the air permeable film consists in forming the air permeable film on the substrate surface by simultaneously spraying a hydrophilic organic solvent solution of linear polyurethane and water to the substrate surface and depositing and solidifying the polyurethane resin on the substrate surface.