Editing Offset printing (section)

==Sheet-fed offset==
{{Redirect|Sheetfed|the type of image scanner|Image scanner#Sheetfed}}
[[File:Bogenoffsetmaschine-2-1980.jpg|thumb|''Roland Favorit RF01'' sheet-fed offset press]]
[[File:Scanseri 4c offset.jpg|thumb|Ryobi 4 color offset press]]

Sheet-fed refers to individual sheets of paper or rolls being fed into a press via a suction bar that lifts and drops each sheet onto place. A lithographic ("litho" for short) press uses principles of [[lithography]] to apply ink to a printing plate, as explained previously. Sheet-fed litho is commonly used for printing of short-run magazines, brochures, letter headings, and general commercial (jobbing) printing. In sheet-fed offset, "the printing is carried out on single sheets of paper as they are fed to the press one at a time". Sheet-fed presses use mechanical [[Printing registration|registration]] to relate each sheet to one another to ensure that they are reproduced with the same imagery in the same position on every sheet running through the press.<ref>"What is Offset Printing"{{Which|date=December 2011}}</ref>

===Offset duplicators===
In the United States, an offset press with paper size up to {{cvt|12|x|18|in|mm}}, is classified as a [[Duplicating machines|duplicator]] instead of a press. Offset duplicators are used for fast, good quality reproduction of one-color and two-color copies in sizes up to {{cvt|12|x|18|in|mm}}.<ref name="romana139">Romano & Riordan 139–141</ref> Popular models were made by [[A. B. Dick Company]], [[Addressograph|Multilith]], and the Chief and Davidson lines made by [[American Type Founders|A.T.F.-Davidson]]. Offset duplicators are made for fast and quick printing jobs; printing up to 12,000 impressions per hour. They are able to print business forms, letterheads, labels, bulletins, postcards, envelopes

===Feeder system===
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.<ref>DeJidas & Destree, 2005, p. 55-57</ref>

===Printing–inking system===
The Printing Unit consists of many different systems. The dampening system is used to apply dampening solution to the plates with water rollers. The inking system uses rollers to deliver ink to the plate and blanket cylinders to be transferred to the substrate. The plate cylinder is where the plates containing all of the imaging are mounted. Finally, the blanket and impression cylinders are used to transfer the image to the substrate running through the press.<ref>DeJidas & Destree, 2005, p. 143</ref>

===Delivery system===
The delivery system is the final destination in the printing process while the paper runs through the press. Once the paper reaches delivery, it is stacked for the ink to cure in a proper manner. This is the step in which sheets are inspected to make sure they have proper ink density and registration.

===Slur===
Production or impact of double image in printing is known as slur.<ref>AMAN-2008</ref>{{Verify source|date=October 2018}}