| abstract |
Oneninventive methodnfor drying or hardeningnof printing ink or varnish on a printing substrate, e.g. a paper sheet,nwherein the printing substrate with infrared radiation, in particular NIR radiation,nis irradiated and an infrared absorber for absorbing the infrared radiationnis used, characterized by the fact that as an infrared absorberna hexarylene is used. The hexarylene may be the printing inknbe added as an additive before printing. The irradiationncan be done by means of a laser, in particular an NIR laser. |