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Browse Prior Art Database

Screening Nozzle with Non-Line Contact

IP.com Disclosure Number: IPCOM000050465D
Original Publication Date: 1982-Nov-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Brilla, RC: AUTHOR [+3]

Abstract

A screening nozzle having a flat contact portion improves screening quality and mask life, and increases nozzle wear life. In Fig. 1, a conventional screening nozzle 10 with line contact and a mask 12 are shown in partial cross-section. As the nozzle is wiped across the mask, the paste composition 14 escapes through the mesh pattern in the mask, as shown by arrow 16. The loss of paste pressure due to the escape path prevents the nozzle from providing a clean wipe and good screening quality.

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Screening Nozzle with Non-Line Contact

A screening nozzle having a flat contact portion improves screening quality and mask life, and increases nozzle wear life. In Fig. 1, a conventional screening nozzle 10 with line contact and a mask 12 are shown in partial cross-section. As the nozzle is wiped across the mask, the paste composition 14 escapes through the mesh pattern in the mask, as shown by arrow 16. The loss of paste pressure due to the escape path prevents the nozzle from providing a clean wipe and good screening quality.

In Fig. 2, an improved screening nozzle 10' includes a flat contact portion 18 which contacts the mask during the wiping action, as opposed to the edge contact with the mask as shown in Fig. 1. The flat contact nozzle seals off the paste escape area, thereby achieving improved hole filling with less smearing. The material for the improved nozzle is made of tungsten carbide and not steel. The tungsten carbide prevents transfer of mask material, typically nickel, to the surface of the nozzle as in the case of the steel nozzle of Fig. 1.

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