Graphic Design & Printing Technology

Graphic Design & Printing Technology

image from the plate cylinder
and transfers or offsets it to the
substrate withthe help of the
impression cylinder.
Impression cylinder:- The
impression cylinder carries the
paper through the printing unit,
and presses it against the inked
blanket where the image is
transferred to the paper. This
cylinder uses a set of grippers
to grab the lead edge of the
press sheet when the sheet
reaches the end of the feed
board. The paper is drawn
around the impression cylinder and forced against the blanket to make the
impression. The grippers then open to release the press sheet to the delivery
unit or to the next printing unit.

Grippers are the row of mechanical fingers attached to the impression cylinder
that grabs the sheet of paper and feed it to the printing press.

Inking system

The goal of an inking system is to place a uniform layer of ink across every
dimension of the printing plate. All lithographic inking system are made up of
three main sections. Ink fountain and fountain rollers, ink distribution rollers
and inkform rollers.

Ink fountain stores ink in a reservior and fills small quantity of ink to the rest
of inking system from the fountain roller. The ink distribution rollers receives
ink and work it into a semi liquid state that is uniformly delivered to the ink
form rollers. A thin layer of ink is then transferred to the image portion of the
lithographic plate by the ink form rollers.