History of Offset Press
Lithography was initially created to be a low cost method of reproducing artwork.[1][2] This printing process was limited to use on flat, porous surfaces because the printing plates were produced from limestone.[1] In fact, the word 'lithograph' historically means "an image from stone." Tin cans were popular packaging materials in the 19th century, but transfer technologies were required before the lithographic process could be used to print on the tin.[1]
The first rotary offset lithographic printing press was created in England and patented in 1875 by Robert Barclay.[1] This development combined mid-19th century transfer printing technologies and Richard March Hoe’s 1843 rotary printing press—a press that used a metal cylinder instead of a flat stone.[1] The offset cylinder was covered with specially treated cardboard that transferred the printed image from the stone to the surface of the metal. Later, the cardboard covering of the offset cylinder was changed to rubber,[1] which is still the most commonly used material.
As the 19th century closed and photography captured favor, many lithographic firms went out of business.[1] Photoengraving, a process that used halftone technology instead of illustration, became the leading aesthetic of the era. Many printers, including Ira Washington Rubel of New Jersey, were using the low-cost lithograph process to produce copies of photographs and books.[3] Rubel discovered in 1901—by forgetting to load a sheet—that when printing from the rubber roller, instead of the metal, the printed page was clearer and sharper.[3] After further refinement, the Potter Press printing Company in New York produced a press in 1903.[3] By 1907 the Rubel offset press was in use in San Francisco.[4]
The Harris Automatic Press Company also created a similar press around the same time. Charles and Albert Harris modeled their press “on a rotary letter press machine.”[5]
From Wikipedia
18 March, 2012
