Chapter 9
Share
The last color to be printed is typically white which is slow drying, leaving it tacky for the acceptance of a powdered adhesive (a hot melt powder made of polyurethane resin). Once the powder has been applied by a process of cascading the powder over the tacky print and shaking/agitating the film to remove any unbonded powder, the film then passes through a heat tunnel that melts the adhesive to bond it with the ink. Leaving the tunnel, the print and adhesive cool and are ready to be applied.