A raised surface of type is covered with ink. The area below remains untouched. The sheets of paper are pressed against the raised surface. We get inked impressions on these sheets. The text is set in metal types.
The text & pictures are arranged in the required layout. It is then locked into a frame . Machines take sheets one by one from the stack.
It works on the principle that oil & water mutually repel each other. The image to be printed was drawn in grease on a polished slab. A water – Based solution is brushed over the stone is rejected by grease & accepted by the clean surface. When the stone is inked, the grease accepts the ink & the water areas reject it. Pressing paper down into the inked stone prints image.
It prints by transferring ink from etched metal surface. The ink is wiped on etched surface. It fills the recesses which make up the design. The ink filled image is transferred to paper which is pressed against the metal. The process is known as intaglio process.
The image to be printed is etched into a plate cylinder.