Abstract:
A method and apparatus for applying ink, according to a soldermask pattern, to a printed circuit board (360) having elevated pads defining pad edges, the method including flooding the printed circuit board (360) with ink such that the ink advances, without climbing onto the elevated pads.
Abstract:
The present application provides a latent ink-jet ink formulation suitable as solder mask. The composition generally comprises: (a) at least one compound capable of self cross-linking (USM); (b) at least one phenolic resin; (c) at least one solvent; (d)at least one mineral filler; (e) at least one polyol; and (f) at least one photoinitiator.
Abstract:
The present invention discloses a latent thermosetting ink formulation for ink jet applications comprising a phenolic resin, an amino resin and a polyol. The formulation is characterized as having a viscosity of lower than 50 Cps at a shear rate of 10 to 100,000 sec-1 at a temperature lower than 100 C and a surface tension lower than 40 dynes/cm.