Effect of ink cohesive force on gravure offset printing

In order to understand the ink transfer mechanism of contact printing, a novel method for measuring ink cohesive force was designed and a new apparatus was fabricated through replicating a gravure offset printing process. Measured results showed that the cohesive force of Ag ink increased during the printing process due to solvent absorption into a polydimethylsiloxane (PDMS) blanket material, which enhanced ink transfer from a cliche to a substrate. This enhanced ink transfer mechanism was discussed with the results of changes in ink viscosity and cohesive force and contact angle.

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