Knowledge base

This knowledge base contains all articles and proceedings ever presented at RTE conferences and seminars. You may search through the database using the filters below. Articles are free of charge for our members (after login).

Development of waterbased UV curable inkjet inks for printing on plastic substrates

Why are UV-curable inkjet inks not used for foodpackaging today?•MIGRATION of monomers and photoinitiators•SMELL of non perfectly cured filmsWhat are the main problems of purely water/solvent-based inkjet inks?•High drying times•VOC-content•Poor image quality especially on non porous materials•No drop fix at ionis possible•Poor solvent resistance•O

Decorative Ceramic Surfaces using UV-curable Adhesion Promoters and Nanocomposites Coatings

Digital printing is becoming important in the ceramic tiles industry in order to obtain surfaces with excellent technical and aesthetic properties. Decoration of ceramic products using ink-jet technology by means of UV-curable inks entails an extensive research of different adhesion promoters and top-coat formulations in order to ens

Curing behavior of UV-LED curable inks: Influence of dose, irradiance and wavelength

Over the last decade the irradiance of commercial UV-LED devices increased from a few hundred mW/cm² to approximately 10 W/cm² leading to a wide range of UV-LED curing applications, e.g. curing of adhesives, coatings as well as pinning and full curing of digital inks.UV-LED sources are characterized by low energy consumption, low vol

Curing behavior of UV-curable coating in presence of different multi-functional monomers

The curing behavior of a Urethane-Acrylate UV curable Resin which had been diluted by three monomers (HDDA, TMPTA and DIPEPA), has been studied. Two ClearCoat formulations with different monomer compositions were prepared and cured. Coatings were cut into three thin layers by means of Microtomy sectioning. Both FTIR and HPLC analysis

Chain transfer reagents for molecular weight control in radical photo-polymerization

Radiation curing of (meth)acrylate-based photopolymerizable formulations is a widely used technique for decorative and protective coatings industry. Furthermore it is nowadays used for modern applications such as dental filling materials [1], reprography (photoresists, printing plates, integrated circuits), laser induced 3D curing, h

Control of UV Offset Printing Processes by In-line NIR Spectroscopy

In the last 15 years, near-infrared (NIR) spectroscopy has been developed to one of the most common methods for process control. This is related to its analytic power and versatility, which allows adaption of this method to a wide range of quite different problems [1-3]. As a spectroscopic technique, NIR spectroscopy is a non-destruc

Confocal Raman microscopy study of several factors known to participate in overcoming O2 inhibition

The free-radical photopolymerization (FRP) of coatings suffers from inhibition by atmospheric oxygen which reacts with excited species and radicals.1 During the process, oxygen diffuses from the atmosphere into the film and leads to inhibition period, longer irradiation time, incomplete conversion of the coating and heterogeneity in

Coloured and Tinted Lacquers - The Next Step to Take for Radiation-Curable and Waterborne Binders

During recent years VOC regulations in Europe keep the wood coating industry moving from classical technologies, e.g. solventborne 2K polyurethane and acid catalysed cure of melamine resins, to modern technologies, such as 100% and waterborne radiation-curable resins. Among these modern systems waterborne radiation-curable resin base