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

A model for the screen-printing of Newtonian fluids

“…In the light of these objections, Owczarek and Howland [10,11] instead adopted a modelling approach based upon lubrication theory, more recently extended by Anderson et al [12] to consider the printing of power-law fluids. None of these models, however, has taken into proper consideration the real geometry of the screen-printing process.…”

“…Further, (11) implies that the screen is flat where not in contact with the squeegee. With this information, the condition of tangency at the contact points is enough to determine uniquely the initial configuration of the screen.…”

Screen Printing Process Design of Experiments for Fine Line Printing of Thick Film Ceramic Substrates

“…In his theory, the ink roll in front of the squeegee is treated as a pump generating high hydrostatic pressure close to the squeegee edge to inject ink into the screen meshes. Owczarek and Howland [7,8] described a physical model of the screen printing process. They found that the angles of squeegees during printing decrease from the unformed angle of 45 degrees by about 20 degrees for hard squeegees (90 shore A) and by 30 -40 degrees for soft squeegees (60 shore A).…”

The screen printing of a power-law fluid

“…More recently, Owczarek and Howland [9,10] adopted a modelling approach based upon lubrication theory to model the flow of a power-law fluid in front of, and under, a linear squeegee than runs over a mesh-like stencil. This work was recently extended by Clements et al [11], who proposed a regularisation to remove the singularity as the squeegee/stencil separation goes to zero, and also allowed for a squeegee of an arbitrary shape.…”