Offset printing is a commonly used printing technique where an inked image is transferred (or “offset”) from a plate to a rubber blanket, then to paper. The offsetprocess is a lithographic procesOs. Lithoghraphy is a process based on the repulsion of oil and water.

Small offset lithographic presses that are used for fast, good quality reproduction of one-color and two-color copies in sizes up to 12″ by 18″.] Popular models were made by A. B. Dick Company, Multilith, and the Chief and Davidson lines made by A.T.F.-Davidson. Offset duplicators are made for fast and quick printing jobs; printing up to 12,000 impressions per hour.[..]

A perfecting press, also known as a duplex press, is one that can print on both sides of the paper at the same time.Sheet-fed offset presses are similar in that many of them can also print on both sides of the paper in one pass, making it easier and faster to print duplex.

The feeder system is responsible for making sure paper runs through the press correctly. This is where the substrate is loaded and then the system is correctly set up to the certain specifications of the substrate to the press.