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Screening Low Viscosity Pastes

IP.com Disclosure Number: IPCOM000085622D
Original Publication Date: 1976-May-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Ameen, JG: AUTHOR [+2]

Abstract

Solid stainless steel sheets with required patterns etched therein are often used as screening masks, for material such as stop resist. A difficulty encountered with this type of mask using thin paste is that the paste tends to ooze underneath the stainless steel, thereby smearing the pattern.

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Screening Low Viscosity Pastes

Solid stainless steel sheets with required patterns etched therein are often used as screening masks, for material such as stop resist. A difficulty encountered with this type of mask using thin paste is that the paste tends to ooze underneath the stainless steel, thereby smearing the pattern.

To alleviate this problem, a thin layer of silicone material, such as SILASTIC* RTV #732, is squeegeed onto the side of the mask that will contact the module on which the pattern paste is to be deposited. When the mask-silicone combination is lifted from the screening table, the pattern in the mask remains clean. The mask is air dried for approximately 10 minutes and baked for 15 minutes at 100 degrees C, the silicone acting as an elastic gasket sealing the module mask interface so that thin paste can be screened. * Trademark of Dow Corning Corporation.

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