A study of the off-contact screen printing process. II. Analysis of the model of the printing process

Author

Owczarek, Jerzy A. ; Howland, Frank L.

Author_Institution

Dept. of Mech. Eng. & Mech., Lehigh Univ., Bethlehem, PA, USA

Volume

13

Issue

2

fYear

1990

fDate

6/1/1990 12:00:00 AM

Firstpage

368

Lastpage

375

Abstract

For pt.I see ibid., vol.13, no.2, p.358-67, 1990. The analysis presented is concerned with the derivation of equations which allows calculation of the thickness of dry paste deposited on a substrate in the off-contact screen printing process. The rheological properties of the paste are approximated by those of a power-law fluid. Deformed squeegee shape in the paste deposition region is considered to be that of a wedge. The equations show that the height of the deposited paste depends on the magnitude of the equivalent paste height under the squeegee and on the paste flow speed under the squeegee. The equivalent paste height under the squeegee depends, for a given screen, on the deformability of the squeegee and on the emulsion height. The paste flow speed under the squeegee depends, for a given paste and screen, on the magnitude of the pressure buildup ahead of the squeegee. The pressure buildup in turn is a function of the squeegee deformation characteristics and of squeegee translational speed

Keywords

integrated circuit technology; printing; thick film circuits; deformability; dry paste; emulsion height; equivalent paste height; model; off-contact screen printing process; paste deposition region; paste flow speed; power-law fluid; pressure buildup; rheological properties; squeegee shape; squeegee translational speed; thickness; Blades; Coordinate measuring machines; Equations; Floods; Printing; Residual stresses; Rheology; Shape; Solids; Wire;

fLanguage

English

Journal_Title

Components, Hybrids, and Manufacturing Technology, IEEE Transactions on

Publisher

ieee

ISSN

0148-6411

Type

jour

DOI

10.1109/33.56170

Filename

56170