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Screen Printing on Indented Ceramic Green Sheets

IP.com Disclosure Number: IPCOM000081118D
Original Publication Date: 1974-Apr-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Desai, KS: AUTHOR [+3]

Abstract

The conductivity of screen-printed lines in multilayer ceramic modules is increased without widening the line, by hot stamping an indentation into the ceramic green sheet and then screen printing on top.

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Screen Printing on Indented Ceramic Green Sheets

The conductivity of screen-printed lines in multilayer ceramic modules is increased without widening the line, by hot stamping an indentation into the ceramic green sheet and then screen printing on top.

After casting and drying, the green ceramic sheet is separated from the MYLAR* casting base. The MYLAR casting base was previously coated with polyvinyl alcohol (PVA). On peeling the green sheet from the MYLAR, the PVA coating strongly adheres to the green ceramic sheet forming a thin smooth uniform film.

Indentations of the desired conductor patterns are then pressed into the PVA coated side of the green ceramic sheet by pressing a metal sheet against it, e.g., @ 70 degrees F and 400 psi. The metal plate is thick enough and rigid enough to allow indentation to be made by low-forming pressures. The metal plate has conductive patterns or circuitry photoetched into it as embossed circuitry. The metal sheet is coated with a release agent, e.g., a high-melting point wax. Mechanical plungers which are mounted in holes in the metal plate are pushed through the green ceramic sheet for forming via holes, or the metal sheet with holes is used as a mask to form holes in the green ceramic sheet with a laser beam.

The ceramic green sheet then is removed from the metal plate and filled by squeegeeing with a paste which contains metal powder (high-conductivity metals such as Ag, Au, Cu, etc.) in an organic vehicle, which does no...