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Does the increase of radiation energy really reduce the risk of photoinitiator migration from polygraphic varnish to packed product? The influence of UV radiation dose on the migration of 4-phenylbenzophenone from polyacrylate varnish in food packaging

Dawidowicz, Andrzej L., Typek, Rafal, Dybowski, Michal P., Nowakowski, Przemyslaw
Food packaging and shelf life 2019 v.20 pp. 100308
aqueous solutions, energy, ethanol, food packaging, free radicals, liquids, mass transfer, models, polyacrylic acid, risk reduction, shelf life, surface roughness, ultraviolet radiation
The use of polygraphic varnishes in the packaging production process is obvious today. Currently, free radical cured polygraphic varnishes are most widespread. The paper presents an effect of the UV radiation dose magnitude applied for polyacrylate varnish curing on the estimation of 4-phenylbenzophenone migration. It was observed that the migration of this most common photoinitiator initially decreases and subsequently increases with the rise of the UV radiation dose. The shape of the relationship does not depend on the composition of model liquid (aqueous solutions of ethanol) used in the measurements. Extensive research proves that the observed effect is connected with the change of mass transfer resistance of the photoinitiator between the varnish layer and the model liquid resulting from the change of surface roughness caused by and dependent on a dose of UV radiation.