Method for color television picture tube aperture mask production employing PVA and removing the PVA by partial carmelizing and washing

摘要

A method for producing etched metal bodies, particularly color television picture tube aperture masks, comprises the steps of applying a polyvinyl alcohol photoresist film to the metal substrate, exposing the film, developing the image produced by exposure, heat hardening the developed image, acid etching the metal body, heating the body to caramelize the remaining film, and stripping the caramelized film from the metal body using an aqueous caustic stripping solution. The heat caramelization step greatly enhances the caustic strippability of heat hardened polyvinyl alcohol films from metallic surfaces.