Knowledge base

The ability to create a matt effect in traditional water and solvent based coatings using available matting agents is well understood. In contrast, when the coating is UV (100% solid), more matting agent is required to compensate for the lack of film shrinkage (solvent evaporation). This can lead to problems such as:o Adverse rheological effects e.

As long ago as 1995 the Berufsgenossenschaft Druck und Papierverarbeitung ('Institution for statutory accident insurance and prevention in the printing and paper processing industry"; BG) responsible for the printing industry in Germany realized that a totally new approach to the control of chemicals was required if the industry and authorities wer

The importance of low emission coating using light curing, has been increase, due to the VOCreduction demands, but these is a number of reasons for use and non ignore any more the UV curing technology for industrial coating procedures. All industry are being pushed by intense efforts to limit de emission of volatile organic (VOC 's ) as stipulated

The physical interactions between electro-magnetic radiation and colour pigments in pigmented UV coatings complicate the through-cure of such coating films. We illustrate the effects due to the interference of the UV lamp spectral power distribution, wavelength dependant pigmented film transmittance and spectral susceptibility of the photo-initiato

A new generation of low voltage, low cost electron beam dryers in the 70 kV — 110 kV range, has opened new opportunities for electron beam drying in the packaging and printing industry. Electrons accelerated at these low energies are now efficiently used to cure photoinitiator-free offset and flexo-inks, overprint varnishes and lacquers and laminat

UV technology represents a good choice for the development of low VOC products. Nevertheless there are some problems. A 100% solid content system avoids emissions into the environment, but users have to deal with skin-irritant or sensitizing materials and, technically, formulators are faced with difficulties in matting. A less than 100% UV system o

A previous paper presented at Radlech 2002 discussed novel self-initiating resins that UV-cure with no or very little added photoinitiator. These resins contain a stable photoactive chromophore that becomes part of the resin/oligomer structure through the Michael addition reaction between 13-diketones, 13-ketoesters and/or 13-ketoamides with common

By going through the required properties to achieve adhesion this presentation will cover selection of monomers and oligomers and will be illustrated by several case studies.