lts, the pa ckaging ink manufacturer in conjunction with the converter shall evaluate available knowledge in ter ms of suitability for use in the proposed structure . Size of printed sheets (test pieces) sufficient for migration cell preferable DIN A4 Ink coverage 100 % for each colour (e.g. colour/white) Ink film weight (dry) The ink film weight must be representative for the printing technology. Values given beside are only indicative. Flexographic ink 1-1.5 g/m2 Gravure ink 1-2 g/m2 Offset ink 1-2 g/m2 Dispersion varnish 2-3 g/m2 White basecoat 12-16 g/m2 Clear basecoat 1-2 g/m2 UV varnish 4-7 g/m2 The average ink weight per unit area is required to calculate the maximum possible migration quantity of potential migrants caused by printing pon ents.
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