Vellum paper will shrink as it is going through the laser printing causing a slight registration error. Because of that you will find that ink jet positives or professional made film positives will produce a film positive that is vastly superior to using vellum paper.
The ideal halftone dot on a film positive will be as dense a color black as possible and each succeeding color separation will line up in registration as perfectly as possible. The more experience that you have, the better you will become at printing halftones.ĭRAWBACKS OF VELLUM VS. Printing halftone dots by hand to achieve good looking prints requires a certain amount of practice and experimentation.įurther, it is recommended that the squeegees that you use for printing halftones have sharp blades that are free of nicks and other imperfections and are of medium, hard, or multi-durometer.Īgain, practice makes perfect. The more the squeegee is angled downward (assuming equal pressure and speed in the stroke) the more ink that will be deposited and the darker the print will become. Probably the most important element that will control manual halftone printing is the angle of the squeegee. Automatic screen printing machines always produce a better result than a manual printer and your goal is to try to “emulate an automatic press” in your printing technique.Īvoid flood stroking if possible and use as few strokes as possible with one stroke being ideal. You want to try to print “like you are a machine” with consistent, repeatable strokes of the same angle, pressure and speed.
Our recommendation is to use as little pressure as possible to clear the ink from the screen and to print at a regular and deliberate speed at a normal squeegee angle. The angle, pressure, and speed at which you pull the squeegee will effect how a halftone dot is printed on the substrate. This discussion is limited to manual screen printing only.
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