Perfecting Press
Most sheetfed presses can print on only one side of the sheet in a single pass. For the other side to be printed, the entire paper pile must be turned over and the paper run through the press a second time. There is, however, a type of sheetfed press that can print on both sides of the sheet in a single pass. The printing of at least one color on both sides of a sheet in a single pass through a press is called perfecting; any press that can do so is called perfecting press, or perfector.
With another type of sheetfed perfecting press that is used infrequently, the blankets from two printing units are in contact, with the paper passing between the two blankets. This type of press is called a blanket to blanket press, because the two blankets are in contact. No impression cylinder is needed; each blanket acts as the impression cylinder for the other. Most web offset presses print blanket to blanket.
Edit By Vikas
April 12, 2012
