Patent ID: 6550905
Filing Date: 2003-04-22
Classification: B41J,B41M,C09D,F26B

Abstract:
A method of polymerizing one or more inkjet inks including pigment and having a viscosity and superficial tension suitable for inkjet printing, the method comprising the steps of:depositing the one or more inks on a substrate using one or more inkjet heads in an inkjet printer; irradiating the deposited inks with UV radiation relatively high in UVC radiation, the UVC-rich radiation produced by a first UV source, the irradiation while the substrate is moved relative to the first UV source; and depleting the region close to the substrate surface of oxygen such that the region between the first UV source and the laid out inks has 2% or less residual oxygen during the irradiating to increase the amount of UVC reaching the inks, such that the inks can be relatively free of photoinitiator, the relative amount of photoinitiator in any ink being about 0.3% or less by weight.