PURPOSE: To produce a printing screen having printing efficiency completing printing by one printing and enabling flat printing in a uniform thickness.
CONSTITUTION: The built-up parts of both end parts of a printing pattern in the vicinity of the emulsions 1 of a stainless steel screen are coated with a solution prepared by dissolving polyvinyl butyral in ethyl cellosolve and the mesh parts of the stainless steel wires 2 of the uncoated stainless steel screen are etched with an aqueous acid or alkali solution to dissolve the stainless steel wires 2 to increase the aperture ratio of the stainless steel screen. By this method, a printing screen having two kinds of aperture ratios is formed. This printing pattern is used to form electrode paste on an aluminum substrate.
UENO TORU
IWABUCHI YUICHI
