Stencil manufacture

摘要

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.