Graphic Design & Printing Technology3.1.8 Types of Ink
Sheetfed ink, rubberbased ink, web offset heatset inks, weboffset coldset
inks, news inks, non-porous inks, uv inks, magnetic inks, invisible
inks, soy inks, opaque inks, waterless inks, flourescent inks, metalic
inks, overprint varnishes, toner ink, optically variable inks
3.1.9 Chemicals used in Printing
Dampening solution
Water, Acid (measuring pH, conductivity), Gum arabic, Wetting agents,
Corrosion inhibitors, Anti foaming agents, Fungicides and drying stimu-
lators, Alcohol dampening solution
Other press room chemicals
Unit 2 - Sheetfed Offset Press (Periods 40)
3.2. Sheetfed Offset Press
3.2.1 Press classification
Duplicators and Presses
Sheetfed Presses
Webfed Presses
Mulit colour Presses
Perfecting Presses
Waterless offset Presses
Digital Offset Presses
3.2.2 Working Principle and Operating Units of an Offset machine
Feeder Unit
Successive sheet feeding, Continuous feeding, stream feeding
Parts of feeding unit
(Pile feeder, pile board, pile height governor, blower, sucker, sheet sepa-
rator)
Registration Unit
Functions of registration unit
Parts
(Double sheet detector, front lay, side lay, conveyor tape, running in
wheels, two point guide system, three point guide system, transfer cyl-
inder system)
Printing Unit
Cylinder structure - undercut, bearer, gutter, cylinder body, drive gears,
cylinder gap
Cylinders - The plate cylinder - function
Blanket cylinder - function
Impression cylinder - function
Grippers