A printing technique also known as silk-screen printing in which the print is produced by the ink being pressed with a so-called doctor blade through the permeable areas of a screen (mesh) on to the substrate below. Screen printing enables a thicker layer of ink to be applied in one operation than any other printing process. Characteristics: Generally dense covering of ink, thick layer; net structure with saw-tooth edges. In security printing, screen printing is mainly used for laminate overprints or printing of OVI.
Source : Click Here