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).
UV Inkjet Printing on Food Packaging: State of Art and Outlook
• Inkjet printing on packaging = answer to packaging trends• UV LM inkjet ink formulation  low viscosity for jetting• Thereby requires full conceptual development of LM ink concept• Monomers and photo-initiators need to be LM ink specific designed for combination of low viscosity and high curing degree• Dedicated LM inkjet ink technology can resul
Investigation of Printing Inks and Coatings Formulations for UV-LED Cure
• only a selected number of Photoinitiators work under LED• LED 365 shows the best results for a magenta ink.• A 3 level (6-2) DoE shows that DETX and TPO/BAPO are sufficient for a good cure• EMK has in most cases a negative impact on cure, maybe due to its high efficiency, and yellows to much in magenta at 3% content• DoE works good to predict rea
UV LED Curing in Low Migration Printing - Controlling the Variables
Once parameters for a low migration printing process are established, the most critical variable remaining is curing. Despite challenges for ink formulators, UV LED is the key curing technology eliminating this vulnerability. It is outlined, why UV LED curing due its unique properties is an enabling technology for printing within a tight operating
Water-Based UV Inkjet - Novel Chemistry Approach for Food Packaging Applications
UV inkjet made tremendous progress in productivity and print quality in recent years. Market penetration in graphic arts picks up speed making traditional UV offset and UV flexo face increased competition from UV inkjet, particularly in label and packaging printing. Difficulties realising food contact compliance are a major concern limiting the gro
New EB curable CI-Flexo Ink Technology providing sustainable printing solutions for packaging applications
New EB CI-flexo ink technology has been developed to permit wet trapping without interstation hot air drying. This ink technology uses electron beam initiated free radical polymerization to achieve cure, and wet trapping is obtained by organo-jellification mechanism using Hansen Solubility Parameters (HSP). This patented new printing process was de
FORMATION OF 3D STRUCTURES IN OFFSET PRINTING TECHNIQUES BY UV INDUCED FOAMING OF INKS
The present work addresses the formation of 3D structures via UV assisted foaming of commercially available acrylic offset inks. The microcellular foaming relies on the excitation of selected photoacid generators with UV light to release Brønsted acids. Once formed, the acids react with calcium carbonate particles under the release of carbon dioxid
Highly Efficient Cleavable Photoinitiators for Visible Light Curing of Aqueous Formulations
Curing water-based formulations with photoinitiators is a state of the art technique. However, the commercially available Norrish type II water-compatible photoinitiators disappeared from the market since the bimolecularity and the resulting solvent cage in a water-based solution lead to a loss in reactivity. Since a few decades there is only one c
Toughening of Methacrylate Networks through Addition-Fragmentation Chain Transfer
In the broad field of photopolymers three dimensional networks are formed by free-radical polymerization. These networks have to fulfill a variety of requirements including high reactivity of the monomers and good mechanical properties. During polymerization an inhomogeneous network forms, that decreases the mechanical properties of the polymer and
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