Printing Process Color Inks, Fine Detail and Dark Inks
For many reasons, process color, fine detail and small text printing requires the sharpest edge possible. A sharp squeegee provides the type of ink shear you need to maintain detail. The primary objective is to accurately reproduce half tone dots with as little dot gain as possible, to keep fine lines from spreading. High shear from a sharp squeegee edge is the best way to minimize the gain.
With a rounded squeegee edge, the interface between the squeegee and the screen forces more ink through the mesh. Coupled with the additional drag of the squeegee on the screen, this leads to a heavier ink deposit and dot gain. In half tone printing, fine details and small text you’ll definitely want the sharpest possible squeegee.