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What actually migrates?

To answer this question, the structure of the various ink systems has to be considered.

With regard to UV inks, special attention is paid to the photoinitiators which are decomposed by the action of UV radiation and may possibly not be integrated into the ink film in the case of insufficient cure. The respective printing ink binder base can be a carrier of potential migrants, either by contamination or by nonintegrated monomers. Considering the facts relating to the raw materials, substances of low molecular weight show a stronger migration potential. In the UV range, for example, the photoinitiators are divided into very small fission products. J + S have developed specific approaches to meet these risks of migration.

Carcinogenic and mutagenic substances are excluded from production. In the field of conventional offset printing, heavy metal driers are not used. Through careful research and selection of raw materials, oils and resins have been found and are employed that do not form fission products. With similar stringent care only suitable pigments have been selected. Careful evaluation has revealed fatty acid esters that can be safely used.

In UV technology, high-molecularweight photoinitiators and, alternatively, self-initiating binders can be used. In UV systems used for food packaging, only extensively cleaned binders are used; furthermore, the proportion of monomers in the binder complex is also reduced to a minimum.