A process and apparatus for making relatively thin amorphous film in which a molten film, which is extruded from a slot orifice, is drawn over a cooled control roller spaced from the orifice at its point of contact with said film at a distance not more than about 20 mm before it is received on a quenching...http://www.google.es/patents/US4066729?utm_source=gb-gplus-sharePatente US4066729 - Extrusion method and apparatus
