The selective deposition of thick-film materials onto a substrate essentially depends on forcing ink through a stencil, screen, or mask mounted under tension on a metal frame. Stainless steel mesh screens are the most commonly used for hybrid thick-film printing while etched metal masks are sometimes used for high precision purpose.
The circuit pattern is formed photographically on the mesh using ultraviolet (UV)-sensitive filler emulsion. The appropriated paste to be printed is placed on one side of the screen. A polyurethane squeegee is used to force the paste through the open meshes. The pressure applied to the squeegee must be sufficient to ensure complete filling of each aperture before the squeegee edge passes over the aperture, but not high enough to cause spreading of the paste between the screen and the substrate.
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