A printing method in which both sides of a sheet of paper are printed simultaneously, with two blanket cylinders per color; a sheet of paper is passed between them, with each cylinder printing on one side of it.[13]Blanket-to-blanket presses are also called perfecting or duplex presses because they print on both sides of the sheet at the same time.[14] This method is most used on offset presses designed for envelope printing.
Blanket-to-steel
A printing method similar to a sheet offset press; except that the plate and cylinder pressures are quite precise. The actual squeeze between the plate and the blanket cylinder is optimal at 0.005″; as is the squeeze or pressure between the blanket cylinder and the substrate.[15] Blanket-to-steel presses are considered one-color presses. To print the reverse side, the web is turned over between printing units using turning bars.[15] The method can be used to print business forms, computer letters, and direct mail advertising.
Variable-size printing
A printing process that uses removable printing units, inserts, or cassettes for one-sided and blanket-to-blanket two-sided printing.[15]
Keyless offset
A printing process that is based on the used on the concept of using fresh ink for each revolution by removing.[15] It is suitable for printing newspapers.
Dry offset printing
A printing process that uses a metal-backed photopolymer relief plate, similar to a letterpress plate. This method is used for printing on injection molded rigid plastic buckets, tubs, cups, and flower pots.