NICKEL ELECTROFORMING BATH OF ELECTROFORMING DIE FOR DIAL

摘要

PURPOSE:To produce an electroforming die for patterning by striking having excellent durability and transfer rate in the stage of producing said die for a striken dial by providing a conductive layer on the surface of a pattern formed of a curable resin, and forming an Ni plating layer on the surface thereof by a plating bath consisting of prescribed compsn. CONSTITUTION:Production of an electroforming die to be used in forming characters and patterns by striking on the surface of the dial, etc. of a timepiece is accomplished by placing a glass ring 2 on a blank material of paper, leather, etc. on which the characters and patterns to be transferred are formed, and sealing the contact parts between both by clay 3. A curable resin 4 is then cast into the ring 2 to reproduce the characters and patterns on the resin surface. A conductive layer 6 is formed by electrodeposition, etc. on the resin surface to form an electroforming pattern 5. Said pattern is electroplated in an Ni plating bath contg. sodium benzaldehyde 2,4-disulfonic acid at 5-50g/l rate, by which the electroforming die having excellent preciseness and corrosion resistant of the characters and patterns is produced.