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Browse Prior Art Database

Improved Screening Technique and Apparatus

IP.com Disclosure Number: IPCOM000045065D
Original Publication Date: 1983-Jan-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Hetherington, R: AUTHOR [+2]

Abstract

In this technique and apparatus the mask used to define the screened pattern is maintained at a high tension in direct contact with the substrate by providing an arched surface on the substrate support.

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Improved Screening Technique and Apparatus

In this technique and apparatus the mask used to define the screened pattern is maintained at a high tension in direct contact with the substrate by providing an arched surface on the substrate support.

In screened printing operations, in particular, operations used to imprint a pattern of conductive paste on a green ceramic sheet, the features are frequently oversized because firm contact is not maintained between the mask and the sheet. Screening operations for imprinting conductive paste on a substrate are described in more detail in U.S. Patent 3,354,931. When the tension of the mask is not maintained, the screening nozzle may form a slight buckle ahead of the nozzle during application of the paste. This causes distortion of the resultant printed pattern and frequently oversized screened features.

In this operation, the support 10 for green sheet 12 is provided with a convex upper surface 14. The mask 16 is attached to rectangular frame 18 and when placed over the green sheet 14, is maintained in a taut and firm contact with the green sheet 14. Screening nozzle 20, moved in the direction of arrow 22, is less likely to cause the buckle or wrinkling of the mask ahead of the nozzle during screening operations.

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