B - Operations – Transporting – 41 – F
Patent
B - Operations, Transporting
41
F
B41F 7/36 (2006.01) B41F 7/02 (2006.01) B41F 23/04 (2006.01) B41M 1/08 (2006.01)
Patent
CA 2156005
A rotary offset printing method utilizes dry planographic, waterless printing plates, aqueous printing ink and interstation drying and extraction. Because a dampening system is not needed and the aqueous printing ink does not contain oily components, the problems associated with the two-component water/oil chemistry of offset lithography printing are eliminated. The aqueous printing ink is transferred to a waterless printing plate having a non-image surface area which is hydrophobic and also having an image surface area which is hydrophilic. The aqueous printing ink is applied to the surface of the waterless printing plate whereby the image areas are wetted by the aqueous printing ink, and the aqueous printing ink is repelled from the non-image surface areas. The water component of the aqueous printing ink is evaporated by a high velocity, hot air interstation dryer. Water vapor, volatiles and hot air are extracted from the press by a high performance heat and moisture extractor so that the aqueous ink on a freshly printed substrate is dry and can be immediately overprinted on the next printing unit.
Demoore Howard Warren
Sim & Mcburney
LandOfFree
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