| 摘要 |
PURPOSE:To obtain screen wires of sizes of 6-12mum without cutting by a method in which a plate after forming a resist is subjected to an etching process using an aqueous solution containing 300g/1,000cc or more of cupric chloride and a specific amount of hydrochloric acid. CONSTITUTION:Using an aqueous solution containing 300g/1,000cc or more of cupric chloride and hydrochloric acid in an amount enough to keep cuprous chloride to be chemically changed by the cupric chloride during the processing period in dissolved state in the liquid, a plate after forming a resist is etched. Since the cupric chloride is chamically changed into insoluble cuprous chloride during the processing period, it is necessary to add hydrochloric acid as an aid in order to keep the cuprous chloride in the dissolved state. The etching process used includes Morton Roller touch method, shower spray method, etc., and the preferred temperature of the etching liquid is 25-35 deg.C. |
