Electroconducting track production on transparent substrate comprises silk screen printing using electroconducting paste under conditions to produce thin tracks

摘要

The production of electroconducting tracks on a transparent substrate comprises applying, by silk screen printing, an electroconducting paste on the surface of the substrate to form a predetermined motif of tracks and subjecting it to firing. The process uses a thixotropic paste with a ratio of the viscosity without cutting pressure to the viscosity under cutting pressure in silk screen printing conditions of at least 50 and having a silver content greater than 35% and an impression screen of which the coating is provided, at least partially, with slots of which the narrowest width is at most equal to 0.25 mm /! 0.05 mm so that the width of the smallest electroconducting tracks formed by impression may be less than or equal to 0.3 mm. Independent claims are also included for the following: (a) the utilization of an impression screen incorporating at least 90 wires/cm for forming the electroconducting tracks; (b) a transparent substrate incorporating electroconducting tracks applied by silk screen printing; and (c) the utilization of the substrate as a heated window for a motor vehicle or as an antenna or as an alarm.