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Offset printing is a common printing technique in which the inked image is transferred (or "offset") from a plate to a rubber blanket and then to the printing surface. When used in combination with the lithographic process, which is based on the repulsion of oil and water , the offset technique employs a flat ( planographic ) image carrier.
Direct imaging (digital) offset presses are waterless, with no dampening system. Waterless offset inks have a higher tack and viscosity (thickness) and are stiffer than conventional offset inks. The temperature of the inks must be strictly controlled to maintain the correct viscosity, as the plate surface is designed to repel inks of a specific ...
In printing, set-off is the term given to the unwanted transfer of ink from one printed sheet to another. The problem can occur with most types of printing, and is avoided by the use of slipsheets between copies (so any ink transfer occurs onto discardable paper) or anti-set-off spray powder .
Digital printing has a higher cost per page than more traditional offset printing methods, but this price is usually offset by avoiding the cost of all the technical steps required to make printing plates. It also allows for on-demand printing, short turnaround time, and even a modification of the image (variable data) used for each impression. [2]
2010 Introducing of autoprint: stands for the vision of a printing press that, at the push of one button – One Touch – brings the highest degree of automation of offset printing. manroland already leads the field in automation of newspaper and commercial web offset presses and has now implemented the concept in sheetfed offset as well.
Negative lithographic printing plate Agfa Advantage DL violet laser imagesetter with VPP68 plate processor. This compares with the older technology, computer-to-film (CTF), where the computer file is output onto a photographic film. This film is then used to make a printing plate, in a similar manner to a contact proof in darkroom photography.