Stencil manufacture

Details Stencil manufacture Stencil manufacture

C - Chemistry, Metallurgy

25

D

C25D 1/08 (2006.01) C25D 5/02 (2006.01) C25D 5/18 (2006.01) H05K 3/12 (2006.01)

Patent

CA 2514265

A method of forming a screen-printing stencil comprising electroforming the stencil using a bi-polar electrical signal. The bi-polar signal comprises a cathodic pulse (22) and an anodic pulse (24) . When the cathodic pulse (22) is applied during the electroforming process, metal is deposited. When the anodic pulse (24) is applied, metal is removed. The cathodic pulse (22) has a longer duration than the anodic pulse (24) . The ratio of the magnitude of the anodic pulse (24) to the magnitude of the cathodic pulse (22) is greater than one.

L'invention concerne un procédé de formation d'un pochoir à impression d'écran comprenant une étape d'électroformation du pochoir utilisant un signal électrique bipolaire. Ce dernier comporte une impulsion cathodique (22) et une impulsion anodique (24). Lorsque l'impulsion cathodique (22) est appliquée pendant l'étape d'électroformage, le métal est déposé. Lorsque l'impulsion anodique (24) est appliquée, le métal est retiré. L'impulsion cathodique (22) dure plus longtemps que l'impulsion anodique (24). Le rapport de l'intensité de l'impulsion anodique (24) et de l'intensité de l'impulsion cathodique (22) est supérieur à 1.

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