| 摘要 |
<p>A method of ink jet printing comprises: providing a multi chromatic inkjet ink set; jetting the ink onto a substrate; applying a first dose of radiation to pin the ink on the substrate; and exposing the pinned ink to a second, higher dose of radiation to form a fully cured image; wherein each ink in the set includes a radiation curable monomer and/or oligomer; a photoinitiator, and a pigment; and wherein, at the wavelength of the first dose of radiation, at least one ink has a pigment with a higher radiation absorption and a photo initiator which absorbs more strongly compared to the pigment and photo initiator in at least one other ink and/or at least one ink has a pigment with a lower radiation absorption and a photo initiator which absorbs less strongly compared to the pigment and photo initiator in at least one other ink; so that the pinning responses of the inks are consistent. The inks may include a solvent which is dried between the two doses of radiation. The radiation doses are preferably supplied by LEDs or a mercury lamp and the radiation is preferably UV. A multi chromatic ink jet set and individually coloured inks are also disclosed.</p> |
