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

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2 Author(s)
Owczarek, J.A. ; Dept. of Mech. Eng. & Mech., Lehigh Univ., Bethlehem, PA, USA ; Howland, F.

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

Published in:

Components, Hybrids, and Manufacturing Technology, IEEE Transactions on  (Volume:13 ,  Issue: 2 )

Date of Publication:

Jun 1990

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