GCM 110 Lecture Notes - Lecture 8: Offset Printing, Lithography, Planographic Printing
22 Apr 2016
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Conventional processes: sheetfed and webfed offset lithography. All traditional printing requires: somewhere to store the ink, somewhere to mount the image carrier (plate, some way to get the ink from the storage area to the image carrier and then to the substrate. Simple makeready all it is is a plate change. Not changing ink or anything else just the plate. Partial makeready plate change and ink change. Full makeready having to change virtually everything. Washing off the press, changing the paper, and changing the plates (most common, takes longest, and costs the most) Works on the principle that oil and water do not mix. Offsetting form one cylinder to another (plate cylinder > blanket cylinder > paper [via impression cylinder]) Most items printed on paper are printed using an offset process. (image area [ink]) oleophilic/hydrophobic loves oil and doesn"t like water. (non-image area [non-ink]) hydrophilic/oleophobic loves water and doesn"t like oil. Sheets of paper are fed into the press.
