EOM “Emulsion Over Mesh.” Proper EOM is typically 10 - 25% of
mesh thickness (ft).
Rz Surface roughness of the print side. A stencil with a low Rz
value has a smooth surface (desireable Rz < 5).Continue reading
Products for Filtration, Separation, Sifting and Printing
Abrasion and degreasing to make the mesh more receptive to stencil adhesion.
This variable precedes the discussion of other stencil variables because it is the source of various common stencil-breakdown problems-pinholes, fisheyes or poor stencil adhesion to the mesh-often blamed on the emulsion itself. The screen mesh must be prepared for stencil application by, in some cases, abrading and, in all cases, degreasing.Continue reading
Mesh tension: A measure of mesh deflection expressed in terms of Newtons per centimeter (N/cm).
Tension should be looked at in two ways: the initial stretching and re-tensioning of mesh on your frames, and the ways in which tension interacts with other variables during printing. It's difficult to understand its dynamics without looking at tension relative to off-contact distance and squeegee-blade pressure, so be sure to visit those variables after you've read about this one.
The twofold job of mesh tension is to provide resistance for the blade-to be overcome only at the point where the blade forces mesh-to-substrate contact-and to pull the mesh out of the ink film after the blade passes.Continue reading
Plain weave versus twill weave.
With plain weave, each thread goes under one perpendicular thread and over the next. With twill weave, a given thread follows an under-one/over-two pattern.
Mesh counts higher than 305 may be woven with plain or twill patterns. Twill mesh typically deposits more ink than the same or even a lower mesh count of plain weave.Continue reading