Technically, the term Sublimation or also called subli, means the direct phase transition of a substance from the solid phase to a gaseous phase. This is what happens to the color pigments of sublimation ink when heated with a heatpress. If you apply this process with a sublimation printer, sublimation paper, sublimation flex or sublimation flock onto a polyester (coated) product, we speak of sublimation.