Welcome to Converters Prepress Welcome to Converters Prepress Welcome to Converters Prepress Effective Results… Guaranteed!
In the past few decades, offset printing (also called offset lithography) has replaced the letterpress method almost entirely for commercial work. The name offset refers to the fact that the printing plates do not come into direct contact with the paper. offset

offset

Instead, the inked printing plates (which are attached to a cylinder) transfer, or offset, the image to a rubber blanket covering another cylinder. As the inked blanket cylinder rotates, it deposits the image onto the paper, which is fed from another set of rollers.

Unlike letterpress, offset does not depend on raised surfaces to transfer images. Instead it relies on the fact that oil and water do not mix. The offset plate is chemically treated so that the area to which the ink is transferred retains the oily ink and repels water. The rest of the plate retains water and repels ink. As the cylinder continues to rotate, the plate presses against the rubber blanket, which accepts ink from the plate and transfers it to the paper.

offset

Today many printers offer in house plate making, which not only keeps costs down but also ensures the fastest possible turnaround time. In house plate making ensures better control. Strict color controls and QA procedures ensure repeatability and consistency from one run to the next.