Process Offset printing
High-speed, economical printing method for wide mouth rigid containers (jars, tubs, etc.), and, recently, flexible packaging. It offers multicolour printing at low cost, since up to five colours can be applied at one time.

Ink is transferred first from a plate to a rubber blanket, and then from the blanket to the paper. The rubber blanket and the plate, are mounted on cylinders. The paper picks up the image as it passes between the rubber blanket and an impression cylinder.

The printing image on the plate is rendered grease receptive and water repellent, and viceversa for the non-printing areas. The ink used in offset printing is greasy, so that it only wets the image areas which are transferred to the blanket.
Danish Name Offset trykning
Category Surface treatments, Printing
Materials Substrates:
Paper, Card board
Transparent films ( PE PP )
Typical products Labels (e.g. on bottles)
References Drent Graphic Machines
Lerman Container Company
Price notes Initial costs (plate charges) are higher than in silk screen printing.
Environmen- tal notes When UV-inks for printing of plastic substrates are used, a very unpleasant smell is produced. This prevents the diffusion of this method for flexible packaging for food. When used, sucking hoods with carbon filters are needed.
Additional info The quality of the printing tends to be flat compared to that of silk screen printing.
Lacquer overcoating is recommended to protect labels with large areas from scratching.
Photo Tomas Benzon (Computer graphics)
Copyright © 1996-2019 Torben Lenau
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