10 research outputs found
Curing behavior of a UVâcurable inkjet ink: distinction between surfaceâcure and deepâcure performance
Safety requirements and the need of lowâmigration UV inks have received increasing attention in the packaging industry. Crucial for the development and design of lowâmigration UV inkjet inks for migrationâsensitive applications is the polymerization degree. In this study, curingâbehavior of a black, high purity packaging ink (HPPâink) was monitored using ATRâFTIR spectroscopy. UV irradiation of HPPâink led to changes in specific absorption bands of the FTIR spectra due to crosslinking reaction of double bonds. Changes in absorptions bands at 1,408 and 1,321âcmâ1 permitted the determination of CC conversion of acrylic and vinyl double bond, independently of one another. In addition, a method was developed which allows the investigation of surfaceâcure and deepâcure behavior, separately