Abstract
Abstract 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.
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