A dampening water amount regulating apparatus 40 includes a plurality of air supply boxes 41 disposed in a line in an axial direction of a water transfer roller 8 and each defines one air blowing portion. The air supply box 41 includes a substantially U-shaped air passage 67 that allows air in an air supply chamber 57 to pass along an outer peripheral surface of the water transfer roller 8 and supplies the same into an air discharge chamber 60. A valve mechanism 44 that increases and decreases an air amount is provided at a midsection of the air passage 67.

A dampening water amount regulating apparatus 40 includes a plurality of air supply boxes 41 disposed in a line in an axial direction of a water transfer roller 8 and each defines one air blowing portion. The air supply box 41 includes a substantially U-shaped air passage 67 that allows air in an air supply chamber 57 to pass along an outer peripheral surface of the water transfer roller 8 and supplies the same into an air discharge chamber 60. A valve mechanism 44 that increases and decreases an air amount is provided at a midsection of the air passage 67.

Disclosed herein are methods for an ink-based digital printing system, comprising providing an imaging member a reimageable surface layer disposed on a structural mounting layer, the reimageable surface layer comprising a fluorosilicone elastomer and an infrared-absorbing filler comprising carbon black, and a plurality of surface defects on the reimageable surface layer, wherein the surface defects comprises carbon black exposed through the fluorosilicone elastomer of the reimageable surface layer. The method also comprises applying a coating of rejuvenating oil comprising an amino-functional organopolysiloxane to the reimageable surface layer, whereby at least a portion of the plurality of surface defects are coated by the amino-functional organopolysiloxane, thereby rejuvenating the imaging member.

Disclosed herein are methods for an ink-based digital printing system, comprising providing an imaging member a reimageable surface layer disposed on a structural mounting layer, the reimageable surface layer comprising a fluorosilicone elastomer and an infrared-absorbing filler comprising carbon black, and a plurality of surface defects on the reimageable surface layer, wherein the surface defects comprises carbon black exposed through the fluorosilicone elastomer of the reimageable surface layer. The method also comprises applying a coating of rejuvenating oil comprising an amino-functional organopolysiloxane to the reimageable surface layer, whereby at least a portion of the plurality of surface defects are coated by the amino-functional organopolysiloxane, thereby rejuvenating the imaging member.

The present invention relates to the field of environmentally friendly fountain solutions for wet offset printing processes based on oxidative drying inks. In particular, the invention related to the field of wet offset printing processes for producing security features on security documents. The present invention provides a process for producing a security feature by a wet offset printing process, said process being carried out by using a fountain solution comprising one or more manganese (II) salts of a C1-C3 carboxylic acid as well as the fountain solution and its concentrate.

The present invention relates to the field of environmentally friendly fountain solutions for wet offset printing processes based on oxidative drying inks. In particular, the invention related to the field of wet offset printing processes for producing security features on security documents. The present invention provides a process for producing a security feature by a wet offset printing process, said process being carried out by using a fountain solution comprising one or more manganese (II) salts of a C1-C3 carboxylic acid as well as the fountain solution and its concentrate.

This invention relates to a zero alcohol offset printing system, comprises the following parts: Plate cylinder (3), its outer cylindrical surface is covered by printing plate (4); Ink exertion system (1), which comprises ink source (8) and several inking rollers, to exert ink to the printing plate; Dampening liquid exertion system (2), which comprises dampening liquid source (7) and several dampening rollers, to exert dampening liquid to the printing plate; wherein the dampening rollers include a distributor roller (6); wherein the structure of the distributor roller (6) is as follows: it comprises a metal cylinder surrounded by a ceramic layer, and the ceramic layer has texture on its outer surface; wherein the content of alcohol or ether in the dampening liquid is zero.

This invention relates to a zero alcohol offset printing system, comprises the following parts: Plate cylinder (3), its outer cylindrical surface is covered by printing plate (4); Ink exertion system (1), which comprises ink source (8) and several inking rollers, to exert ink to the printing plate; Dampening liquid exertion system (2), which comprises dampening liquid source (7) and several dampening rollers, to exert dampening liquid to the printing plate; wherein the dampening rollers include a distributor roller (6); wherein the structure of the distributor roller (6) is as follows: it comprises a metal cylinder surrounded by a ceramic layer, and the ceramic layer has texture on its outer surface; wherein the content of alcohol or ether in the dampening liquid is zero.

A web printing apparatus includes a transfer device which transfers highly reactive ink/varnish onto a web, and a fixing device which fixes, on the web, the highly reactive ink/varnish transferred by the transfer device. The fixing device includes only a light irradiation device which irradiates the web with light in the wavelength range, in which no ozone is generated, to cure the highly reactive ink/varnish on the web without thermal drying of the web.

A web printing apparatus includes a transfer device which transfers highly reactive ink/varnish onto a web, and a fixing device which fixes, on the web, the highly reactive ink/varnish transferred by the transfer device. The fixing device includes only a light irradiation device which irradiates the web with light in the wavelength range, in which no ozone is generated, to cure the highly reactive ink/varnish on the web without thermal drying of the web.