Browse Prior Art Database

Glass Filled Paste Screening Masks

IP.com Disclosure Number: IPCOM000087208D
Original Publication Date: 1976-Dec-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Jaeger, TH: AUTHOR [+3]

Abstract

A paste screening mask is described for forming patterns, comprising a wire screen mesh as the basic support medium and a low melting temperature glass employed as the filler material to form the solid portions of the mask. The glass can be applied to the mesh by spray application of a powdered glass in slurry form, with appropriate binders and vehicles. The dried slurry on the mesh is heated to reflow the glass into and around the wire mesh resulting in a smooth glass layer completely encapsulating the wire mesh. Using conventional photo-etching techniques, the desired pattern can be formed. After removing the resist material, the mask is ready for mounting and application. Figs.

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Glass Filled Paste Screening Masks

A paste screening mask is described for forming patterns, comprising a wire screen mesh as the basic support medium and a low melting temperature glass employed as the filler material to form the solid portions of the mask. The glass can be applied to the mesh by spray application of a powdered glass in slurry form, with appropriate binders and vehicles. The dried slurry on the mesh is heated to reflow the glass into and around the wire mesh resulting in a smooth glass layer completely encapsulating the wire mesh. Using conventional photo- etching techniques, the desired pattern can be formed. After removing the resist material, the mask is ready for mounting and application. Figs. 1 and 2 show respective top and cross-sectional views of a mask having a solid, glass fill region 1, an open area 2, and a support wire mesh screen 3.

Masks, 4" x 4", have been fabricated using the following materials and processes:
1. Wire mesh: stainless steel, 325 mesh.
2. Mesh mounting: A necessary requirement is to hold the

mesh flat and smooth during spray application and reflow.
3. Glass and slurry: A high PbO glass having a glass transition

temperature near 425 degrees C is mixed 1:1 by weight with a

spray vehicle containing a suitable binder. This mixture was

homogenized in a blender.
4. Spray application: The glass slurry is sprayed onto the

mesh in a holding frame using a conventional spray unit. The

amount of glass applied is controlled by...