Топик По Английскому Языку (Воронов Р. И.) / Letterpress

Letterpress.
This is method of printing Gutenberg invented in 1440 and has been used for job and commercial printing.
It is a relief method of printing that can print from cast matal type, molded duplicate plates or photopolymer
plates on which the image or printing areas are raised above the nonprinting areas. There are two types of
printing processes in general use: (1)plate, impact or pressure printing, and (2)plateless, non-impact or
pressureless printing. Plate systems are the major printing processes: letterpress, flexography etc.,
which are used to print quantities of reproductions for the newspaper, commercial, magazine, catalog, book,
packaging, label and other large printing markets.In general the major plate processes (lithography, letterpress,
UV flexography and gravure) have higher resolution and print quality than the plateless printing processes.
Viscous oil-base andUV inks are used. The ink rollers come in contact with the raised areas only, and the
inked image is transferred directly to the paper. Four types of presses were used: platen, flatbed cylinder,
rotary and belt. Letterpres is making a comaback in specialty printing using photopolymer plates and UV inks
on narrow web presses.